diff --git a/bootstat/boot_reason_test.sh b/bootstat/boot_reason_test.sh
index 7cff7dc..845b303 100755
--- a/bootstat/boot_reason_test.sh
+++ b/bootstat/boot_reason_test.sh
@@ -367,8 +367,6 @@
   adb logcat -b all ${timestamp} |
   grep bootstat[^e] |
   grep -v -F "bootstat: Service started: /system/bin/bootstat --record_boot_complete${match}
-bootstat: Failed to read /data/misc/bootstat/post_decrypt_time_elapsed: No such file or directory
-bootstat: Failed to parse boot time record: /data/misc/bootstat/post_decrypt_time_elapsed
 bootstat: Service started: /system/bin/bootstat --record_boot_reason
 bootstat: Service started: /system/bin/bootstat --set_system_boot_reason
 bootstat: Service started: /system/bin/bootstat --record_time_since_factory_reset
@@ -388,7 +386,6 @@
 init    : processing action (sys.boot_completed=1 && sys.bootstat.first_boot_completed=0) from (/system/etc/init/bootstat.rc
  (/system/bin/bootstat --record_boot_complete --record_boot_reason --record_time_since_factory_reset -l)'
  (/system/bin/bootstat --set_system_boot_reason --record_boot_complete --record_boot_reason --record_time_since_factory_reset -l)'
- (/system/bin/bootstat -r post_decrypt_time_elapsed)'
 init    : Command 'exec - system log -- /system/bin/bootstat --record_boot_complete' action=sys.boot_completed=1 && sys.bootstat.first_boot_completed=0 (/system/etc/init/bootstat.rc:
 init    : Command 'exec - system log -- /system/bin/bootstat --record_boot_reason' action=sys.boot_completed=1 && sys.bootstat.first_boot_completed=0 (/system/etc/init/bootstat.rc:
 init    : Command 'exec - system log -- /system/bin/bootstat --record_time_since_factory_reset' action=sys.boot_completed=1 && sys.bootstat.first_boot_completed=0 (/system/etc/init/bootstat.rc:
@@ -518,20 +515,20 @@
     reboot,bootloader | reboot,bootloader,* ) var=${var#reboot,} ; var=${var%,} ;;
     reboot | reboot,?* ) ;;
     # Aliases and Heuristics
-    *wdog* | *watchdog* )                   var="watchdog" ;;
-    *powerkey* | *power_key* | *PowerKey* ) var="cold,powerkey" ;;
-    *panic* | *kernel_panic* )              var="kernel_panic" ;;
-    *thermal* )                             var="shutdown,thermal" ;;
-    *s3_wakeup* )                           var="warm,s3_wakeup" ;;
-    *hw_reset* )                            var="hard,hw_reset" ;;
-    *usb* )                                 var="cold,charger" ;;
-    *rtc* )                                 var="cold,rtc" ;;
-    *2sec_reboot* )                         var="cold,rtc,2sec" ;;
-    *wdt_by_pass_pwk* )                     var="warm" ;;
-    wdt )                                   var="reboot" ;;
-    *tool_by_pass_pwk* )                    var="reboot,tool" ;;
-    *bootloader* )                          var="bootloader" ;;
-    * )                                     var="reboot" ;;
+    *wdog* | *watchdog* )                                    var="watchdog" ;;
+    *powerkey* | *power_on_key* | *power_key* | *PowerKey* ) var="cold,powerkey" ;;
+    *panic* | *kernel_panic* )                               var="kernel_panic" ;;
+    *thermal* )                                              var="shutdown,thermal" ;;
+    *s3_wakeup* )                                            var="warm,s3_wakeup" ;;
+    *hw_reset* )                                             var="hard,hw_reset" ;;
+    *usb* | *power_on_cable* )                               var="cold,charger" ;;
+    *rtc* )                                                  var="cold,rtc" ;;
+    *2sec_reboot* )                                          var="cold,rtc,2sec" ;;
+    *wdt_by_pass_pwk* )                                      var="warm" ;;
+    wdt )                                                    var="reboot" ;;
+    *tool_by_pass_pwk* )                                     var="reboot,tool" ;;
+    *bootloader* )                                           var="bootloader" ;;
+    * )                                                      var="reboot" ;;
   esac
   echo ${var}
 }
diff --git a/bootstat/bootstat.cpp b/bootstat/bootstat.cpp
index af0c89e..844357c 100644
--- a/bootstat/bootstat.cpp
+++ b/bootstat/bootstat.cpp
@@ -58,7 +58,7 @@
 };
 
 // Maps BootEvent used inside bootstat into statsd atom defined in
-// frameworks/base/cmds/statsd/src/atoms.proto.
+// frameworks/proto_logging/stats/atoms.proto.
 const std::unordered_map<std::string_view, AtomInfo> kBootEventToAtomInfo = {
     // ELAPSED_TIME
     {"ro.boottime.init",
@@ -67,15 +67,9 @@
     {"boot_complete",
      {android::util::BOOT_TIME_EVENT_ELAPSED_TIME_REPORTED,
       android::util::BOOT_TIME_EVENT_ELAPSED_TIME__EVENT__BOOT_COMPLETE}},
-    {"boot_decryption_complete",
-     {android::util::BOOT_TIME_EVENT_ELAPSED_TIME_REPORTED,
-      android::util::BOOT_TIME_EVENT_ELAPSED_TIME__EVENT__BOOT_COMPLETE_ENCRYPTION}},
     {"boot_complete_no_encryption",
      {android::util::BOOT_TIME_EVENT_ELAPSED_TIME_REPORTED,
       android::util::BOOT_TIME_EVENT_ELAPSED_TIME__EVENT__BOOT_COMPLETE_NO_ENCRYPTION}},
-    {"boot_complete_post_decrypt",
-     {android::util::BOOT_TIME_EVENT_ELAPSED_TIME_REPORTED,
-      android::util::BOOT_TIME_EVENT_ELAPSED_TIME__EVENT__BOOT_COMPLETE_POST_DECRYPT}},
     {"factory_reset_boot_complete",
      {android::util::BOOT_TIME_EVENT_ELAPSED_TIME_REPORTED,
       android::util::BOOT_TIME_EVENT_ELAPSED_TIME__EVENT__FACTORY_RESET_BOOT_COMPLETE}},
@@ -83,22 +77,12 @@
      {android::util::BOOT_TIME_EVENT_ELAPSED_TIME_REPORTED,
       android::util::
           BOOT_TIME_EVENT_ELAPSED_TIME__EVENT__FACTORY_RESET_BOOT_COMPLETE_NO_ENCRYPTION}},
-    {"factory_reset_boot_complete_post_decrypt",
-     {android::util::BOOT_TIME_EVENT_ELAPSED_TIME_REPORTED,
-      android::util::
-          BOOT_TIME_EVENT_ELAPSED_TIME__EVENT__FACTORY_RESET_BOOT_COMPLETE_POST_DECRYPT}},
     {"ota_boot_complete",
      {android::util::BOOT_TIME_EVENT_ELAPSED_TIME_REPORTED,
       android::util::BOOT_TIME_EVENT_ELAPSED_TIME__EVENT__OTA_BOOT_COMPLETE}},
     {"ota_boot_complete_no_encryption",
      {android::util::BOOT_TIME_EVENT_ELAPSED_TIME_REPORTED,
       android::util::BOOT_TIME_EVENT_ELAPSED_TIME__EVENT__OTA_BOOT_COMPLETE_NO_ENCRYPTION}},
-    {"ota_boot_complete_post_decrypt",
-     {android::util::BOOT_TIME_EVENT_ELAPSED_TIME_REPORTED,
-      android::util::BOOT_TIME_EVENT_ELAPSED_TIME__EVENT__OTA_BOOT_COMPLETE_POST_DECRYPT}},
-    {"post_decrypt_time_elapsed",
-     {android::util::BOOT_TIME_EVENT_ELAPSED_TIME_REPORTED,
-      android::util::BOOT_TIME_EVENT_ELAPSED_TIME__EVENT__POST_DECRYPT}},
     // DURATION
     {"absolute_boot_time",
      {android::util::BOOT_TIME_EVENT_DURATION_REPORTED,
@@ -468,6 +452,13 @@
     {"watchdog,apc,bl31,crashed", 220},
     {"watchdog,apc,pbl,crashed", 221},
     {"reboot,memory_protect,hyp", 222},
+    {"reboot,tsd,pmic,main", 223},
+    {"reboot,tsd,pmic,sub", 224},
+    {"reboot,ocp,pmic,main", 225},
+    {"reboot,ocp,pmic,sub", 226},
+    {"reboot,sys_ldo_ok,pmic,main", 227},
+    {"reboot,sys_ldo_ok,pmic,sub", 228},
+    {"reboot,smpl_timeout,pmic,main", 229},
 };
 
 // Converts a string value representing the reason the system booted to an
@@ -1306,8 +1297,7 @@
   return android::base::boot_clock::now().time_since_epoch() - GetBootTimeOffset();
 }
 
-// Records several metrics related to the time it takes to boot the device,
-// including disambiguating boot time on encrypted or non-encrypted devices.
+// Records several metrics related to the time it takes to boot the device.
 void RecordBootComplete() {
   BootEventRecordStore boot_event_store;
   BootEventRecordStore::BootEventRecord record;
@@ -1334,25 +1324,15 @@
     return;
   }
 
-  // post_decrypt_time_elapsed is only logged on encrypted devices.
-  if (boot_event_store.GetBootEvent("post_decrypt_time_elapsed", &record)) {
-    // Log the amount of time elapsed until the device is decrypted, which
-    // includes the variable amount of time the user takes to enter the
-    // decryption password.
-    boot_event_store.AddBootEventWithValue("boot_decryption_complete", uptime_s.count());
+  // The *_no_encryption events are emitted unconditionally, since they are left
+  // over from a time when encryption meant "full-disk encryption".  But Android
+  // now always uses file-based encryption instead of full-disk encryption.  At
+  // some point, these misleading and redundant events should be removed.
+  boot_event_store.AddBootEventWithValue(boot_complete_prefix + "_no_encryption",
+                                         uptime_s.count());
 
-    // Subtract the decryption time to normalize the boot cycle timing.
-    std::chrono::seconds boot_complete = std::chrono::seconds(uptime_s.count() - record.second);
-    boot_event_store.AddBootEventWithValue(boot_complete_prefix + "_post_decrypt",
-                                           boot_complete.count());
-  } else {
-    boot_event_store.AddBootEventWithValue(boot_complete_prefix + "_no_encryption",
-                                           uptime_s.count());
-  }
-
-  // Record the total time from device startup to boot complete, regardless of
-  // encryption state.
-  // Note: we are recording seconds here even though the field in statsd atom specifies
+  // Record the total time from device startup to boot complete.  Note: we are
+  // recording seconds here even though the field in statsd atom specifies
   // milliseconds.
   boot_event_store.AddBootEventWithValue(boot_complete_prefix, uptime_s.count());
 
diff --git a/bootstat/bootstat.rc b/bootstat/bootstat.rc
index a350fe7..23f01d1 100644
--- a/bootstat/bootstat.rc
+++ b/bootstat/bootstat.rc
@@ -33,7 +33,6 @@
     chown system log /data/misc/bootstat/last_boot_time_utc
     chown system log /data/misc/bootstat/ota_boot_complete
     chown system log /data/misc/bootstat/ota_boot_complete_no_encryption
-    chown system log /data/misc/bootstat/post_decrypt_time_elapsed
     chown system log /data/misc/bootstat/ro.boottime.init
     chown system log /data/misc/bootstat/ro.boottime.init.cold_boot_wait
     chown system log /data/misc/bootstat/ro.boottime.init.selinux
diff --git a/code_coverage/Android.bp b/code_coverage/Android.bp
index 2cb1617..d18e7a8 100644
--- a/code_coverage/Android.bp
+++ b/code_coverage/Android.bp
@@ -24,6 +24,14 @@
                 },
             },
         },
+        riscv64: {
+            src: "empty_policy/code_coverage.riscv64.policy",
+            product_variables: {
+                native_coverage: {
+                    src: "seccomp_policy/code_coverage.riscv64.policy",
+                },
+            },
+        },
         x86: {
             src: "empty_policy/code_coverage.x86.policy",
             product_variables: {
@@ -67,6 +75,10 @@
                 },
             },
         },
+        riscv64: {
+            // riscv64 doesn't have a secondary architecture.
+            enabled: false,
+        },
         x86: {
             src: "empty_policy/code_coverage.x86_64.policy",
             product_variables: {
diff --git a/code_coverage/empty_policy/code_coverage.riscv64.policy b/code_coverage/empty_policy/code_coverage.riscv64.policy
new file mode 100644
index 0000000..9456932
--- /dev/null
+++ b/code_coverage/empty_policy/code_coverage.riscv64.policy
@@ -0,0 +1,2 @@
+# empty unless code_coverage is enabled.
+# code_coverage.riscv64.policy
diff --git a/code_coverage/seccomp_policy/code_coverage.riscv64.policy b/code_coverage/seccomp_policy/code_coverage.riscv64.policy
new file mode 100644
index 0000000..fdb4d1e
--- /dev/null
+++ b/code_coverage/seccomp_policy/code_coverage.riscv64.policy
@@ -0,0 +1,15 @@
+close: 1
+fchmod: 1
+mkdirat: 1
+msync: 1
+munmap: 1
+openat: 1
+write: 1
+fcntl: 1
+fstat: 1
+ftruncate: 1
+geteuid: 1
+lseek: 1
+mmap: 1
+rt_sigreturn: 1
+prctl: 1
diff --git a/debuggerd/Android.bp b/debuggerd/Android.bp
index ad0231d..15b5813 100644
--- a/debuggerd/Android.bp
+++ b/debuggerd/Android.bp
@@ -14,9 +14,15 @@
         "-Wno-nullability-completeness",
         "-Os",
         "-fno-finite-loops",
+        "-DANDROID_DEBUGGABLE=0",
     ],
 
     local_include_dirs: ["include"],
+    product_variables: {
+        debuggable: {
+            cflags: ["-UANDROID_DEBUGGABLE", "-DANDROID_DEBUGGABLE=1"],
+        }
+    },
 }
 
 cc_library_headers {
@@ -204,6 +210,7 @@
     header_libs: [
         "bionic_libc_platform_headers",
         "gwp_asan_headers",
+        "liblog_headers",
     ],
 
     static_libs: [
@@ -212,7 +219,6 @@
         "liblzma",
         "libbase",
         "libcutils",
-        "liblog",
     ],
     runtime_libs: [
         "libdexfile",           // libdexfile_support dependency
@@ -420,8 +426,8 @@
     local_include_dirs: ["include"],
 }
 
-cc_binary {
-    name: "tombstoned",
+cc_defaults {
+    name: "tombstoned_defaults",
     srcs: [
         "util.cpp",
         "tombstoned/intercept_manager.cpp",
@@ -440,10 +446,20 @@
         "libevent",
         "liblog",
     ],
+}
 
+cc_binary {
+    name: "tombstoned",
+    defaults: ["tombstoned_defaults"],
     init_rc: ["tombstoned/tombstoned.rc"],
 }
 
+cc_binary {
+    name: "tombstoned.microdroid",
+    defaults: ["tombstoned_defaults"],
+    init_rc: ["tombstoned/tombstoned.microdroid.rc"],
+}
+
 prebuilt_etc {
     name: "crash_dump.policy",
     sub_dir: "seccomp_policy",
@@ -451,25 +467,36 @@
     arch: {
         arm: {
             src: "seccomp_policy/crash_dump.arm.policy",
+            required: [
+                "crash_dump.policy_other",
+            ],
         },
         arm64: {
             src: "seccomp_policy/crash_dump.arm64.policy",
+            required: [
+                "crash_dump.policy_other",
+            ],
+        },
+        riscv64: {
+            src: "seccomp_policy/crash_dump.riscv64.policy",
         },
         x86: {
             src: "seccomp_policy/crash_dump.x86.policy",
+            required: [
+                "crash_dump.policy_other",
+            ],
         },
         x86_64: {
             src: "seccomp_policy/crash_dump.x86_64.policy",
+            required: [
+                "crash_dump.policy_other",
+            ],
         },
     },
-    required: [
-        "crash_dump.policy_other",
-    ],
 }
 
 
-// NB -- this installs "the other" architecture. (puts 32 bit config in on 64 bit device)
-// or at least that is the intention so that we get both of them populated
+// This installs the "other" architecture (so 32-bit on 64-bit device).
 prebuilt_etc {
     name: "crash_dump.policy_other",
     sub_dir: "seccomp_policy",
diff --git a/debuggerd/crash_dump.cpp b/debuggerd/crash_dump.cpp
index 967b942..2a769c7 100644
--- a/debuggerd/crash_dump.cpp
+++ b/debuggerd/crash_dump.cpp
@@ -23,7 +23,6 @@
 #include <sys/types.h>
 #include <sys/un.h>
 #include <sys/wait.h>
-#include <syscall.h>
 #include <unistd.h>
 
 #include <limits>
@@ -51,12 +50,9 @@
 #define ATRACE_TAG ATRACE_TAG_BIONIC
 #include <utils/Trace.h>
 
-#include <unwindstack/DexFiles.h>
-#include <unwindstack/JitDebug.h>
-#include <unwindstack/Maps.h>
-#include <unwindstack/Memory.h>
+#include <unwindstack/AndroidUnwinder.h>
+#include <unwindstack/Error.h>
 #include <unwindstack/Regs.h>
-#include <unwindstack/Unwinder.h>
 
 #include "libdebuggerd/backtrace.h"
 #include "libdebuggerd/tombstone.h"
@@ -623,9 +619,12 @@
   }
 
   // TODO: Use seccomp to lock ourselves down.
-  unwindstack::UnwinderFromPid unwinder(256, vm_pid, unwindstack::Regs::CurrentArch());
-  if (!unwinder.Init()) {
-    LOG(FATAL) << "Failed to init unwinder object.";
+
+  unwindstack::AndroidRemoteUnwinder unwinder(vm_pid, unwindstack::Regs::CurrentArch());
+  unwindstack::ErrorData error_data;
+  if (!unwinder.Initialize(error_data)) {
+    LOG(FATAL) << "Failed to initialize unwinder object: "
+               << unwindstack::GetErrorCodeString(error_data.code);
   }
 
   std::string amfd_data;
diff --git a/debuggerd/crasher/Android.bp b/debuggerd/crasher/Android.bp
index 799163e..fe1689c 100644
--- a/debuggerd/crasher/Android.bp
+++ b/debuggerd/crasher/Android.bp
@@ -15,18 +15,18 @@
         "-fstack-protector-all",
         "-Wno-date-time",
     ],
+    tidy: false,  // crasher.cpp tests many memory access errors
     srcs: ["crasher.cpp"],
     arch: {
         arm: {
             srcs: ["arm/crashglue.S"],
-
-            neon: {
-                asflags: ["-DHAS_VFP_D32"],
-            },
         },
         arm64: {
             srcs: ["arm64/crashglue.S"],
         },
+        riscv64: {
+            srcs: ["riscv64/crashglue.S"],
+        },
         x86: {
             srcs: ["x86/crashglue.S"],
         },
diff --git a/debuggerd/crasher/arm/crashglue.S b/debuggerd/crasher/arm/crashglue.S
index 4fbfd6e..8649056 100644
--- a/debuggerd/crasher/arm/crashglue.S
+++ b/debuggerd/crasher/arm/crashglue.S
@@ -32,7 +32,6 @@
 	fconstd   d13, #13
 	fconstd   d14, #14
 	fconstd   d15, #15
-#if defined(HAS_VFP_D32)
 	fconstd   d16, #16
 	fconstd   d17, #17
 	fconstd   d18, #18
@@ -49,7 +48,6 @@
 	fconstd   d29, #29
 	fconstd   d30, #30
 	fconstd   d31, #31
-#endif
 
 	mov lr, #0
 	ldr lr, [lr]
diff --git a/debuggerd/crasher/crasher.cpp b/debuggerd/crasher/crasher.cpp
index 55490b5..4eb7382 100644
--- a/debuggerd/crasher/crasher.cpp
+++ b/debuggerd/crasher/crasher.cpp
@@ -303,6 +303,8 @@
       __asm__ volatile(".word 0xe7f0def0\n");
 #elif defined(__i386__) || defined(__x86_64__)
       __asm__ volatile("ud2\n");
+#elif defined(__riscv)
+      __asm__ volatile("unimp\n");
 #else
 #error
 #endif
diff --git a/debuggerd/crasher/riscv64/crashglue.S b/debuggerd/crasher/riscv64/crashglue.S
new file mode 100644
index 0000000..47dd93b
--- /dev/null
+++ b/debuggerd/crasher/riscv64/crashglue.S
@@ -0,0 +1,45 @@
+
+	.globl crash1
+	.globl crashnostack
+
+crash1:
+	li	x0,0xdead0000+0
+	li	x1,0xdead0000+1
+	li	x2,0xdead0000+2
+	li	x3,0xdead0000+3
+	li	x4,0xdead0000+4
+	li	x5,0xdead0000+5
+	li	x6,0xdead0000+6
+	li	x7,0xdead0000+7
+	li	x8,0xdead0000+8
+	li	x9,0xdead0000+9
+	li	x10,0xdead0000+10
+	li	x11,0xdead0000+11
+	li	x12,0xdead0000+12
+	li	x13,0xdead0000+13
+	li	x14,0xdead0000+14
+	li	x15,0xdead0000+15
+	li	x16,0xdead0000+16
+	li	x17,0xdead0000+17
+	li	x18,0xdead0000+18
+	li	x19,0xdead0000+19
+	li	x20,0xdead0000+20
+	li	x21,0xdead0000+21
+	li	x22,0xdead0000+22
+	li	x23,0xdead0000+23
+	li	x24,0xdead0000+24
+	li	x25,0xdead0000+25
+	li	x26,0xdead0000+26
+	li	x27,0xdead0000+27
+	li	x28,0xdead0000+28
+	# don't trash the stack otherwise the signal handler won't run
+	#li	$29,0xdead0000+29
+	li	x30,0xdead0000+30
+	li	x31,0xdead0000+31
+
+	j .
+
+
+crashnostack:
+	li	sp, 0
+	j .
diff --git a/debuggerd/debuggerd_test.cpp b/debuggerd/debuggerd_test.cpp
index e113308..9c1b136 100644
--- a/debuggerd/debuggerd_test.cpp
+++ b/debuggerd/debuggerd_test.cpp
@@ -406,10 +406,10 @@
       result, R"(signal 11 \(SIGSEGV\), code 1 \(SEGV_MAPERR\), fault addr 0x[01]00000000000dead)");
 }
 
-// Marked as weak to prevent the compiler from removing the malloc in the caller. In theory, the
-// compiler could still clobber the argument register before trapping, but that's unlikely.
-__attribute__((weak)) void CrasherTest::Trap(void* ptr ATTRIBUTE_UNUSED) {
-  __builtin_trap();
+void CrasherTest::Trap(void* ptr) {
+  void (*volatile f)(void*) = nullptr;
+  __asm__ __volatile__("" : : "r"(f) : "memory");
+  f(ptr);
 }
 
 TEST_F(CrasherTest, heap_addr_in_register) {
@@ -445,6 +445,8 @@
   ASSERT_MATCH(result, "memory near x0 \\(\\[anon:");
 #elif defined(__arm__)
   ASSERT_MATCH(result, "memory near r0 \\(\\[anon:");
+#elif defined(__riscv)
+  ASSERT_MATCH(result, "memory near a0 \\(\\[anon:");
 #elif defined(__x86_64__)
   ASSERT_MATCH(result, "memory near rdi \\(\\[anon:");
 #else
@@ -828,7 +830,7 @@
 
   StartIntercept(&output_fd);
   FinishCrasher();
-  AssertDeath(SIGTRAP);
+  AssertDeath(SIGSEGV);
   FinishIntercept(&intercept_result);
 
   ASSERT_EQ(1, intercept_result) << "tombstoned reported failure";
@@ -1403,7 +1405,7 @@
   // We can't actually generate a backtrace, just make sure that the process terminates.
 }
 
-__attribute__((noinline)) extern "C" bool raise_debugger_signal(DebuggerdDumpType dump_type) {
+__attribute__((__noinline__)) extern "C" bool raise_debugger_signal(DebuggerdDumpType dump_type) {
   siginfo_t siginfo;
   siginfo.si_code = SI_QUEUE;
   siginfo.si_pid = getpid();
@@ -1486,6 +1488,37 @@
   ASSERT_BACKTRACE_FRAME(result, "abort");
 }
 
+TEST_F(CrasherTest, seccomp_tombstone_multiple_threads_abort) {
+  int intercept_result;
+  unique_fd output_fd;
+
+  static const auto dump_type = kDebuggerdTombstone;
+  StartProcess(
+      []() {
+        std::thread a(foo);
+        std::thread b(bar);
+
+        std::this_thread::sleep_for(100ms);
+
+        std::thread abort_thread([] { abort(); });
+        abort_thread.join();
+      },
+      &seccomp_fork);
+
+  StartIntercept(&output_fd, dump_type);
+  FinishCrasher();
+  AssertDeath(SIGABRT);
+  FinishIntercept(&intercept_result);
+  ASSERT_EQ(1, intercept_result) << "tombstoned reported failure";
+
+  std::string result;
+  ConsumeFd(std::move(output_fd), &result);
+  ASSERT_BACKTRACE_FRAME(result, "abort");
+  ASSERT_BACKTRACE_FRAME(result, "foo");
+  ASSERT_BACKTRACE_FRAME(result, "bar");
+  ASSERT_BACKTRACE_FRAME(result, "main");
+}
+
 TEST_F(CrasherTest, seccomp_backtrace) {
   int intercept_result;
   unique_fd output_fd;
@@ -1516,6 +1549,40 @@
   ASSERT_BACKTRACE_FRAME(result, "bar");
 }
 
+TEST_F(CrasherTest, seccomp_backtrace_from_thread) {
+  int intercept_result;
+  unique_fd output_fd;
+
+  static const auto dump_type = kDebuggerdNativeBacktrace;
+  StartProcess(
+      []() {
+        std::thread a(foo);
+        std::thread b(bar);
+
+        std::this_thread::sleep_for(100ms);
+
+        std::thread raise_thread([] {
+          raise_debugger_signal(dump_type);
+          _exit(0);
+        });
+        raise_thread.join();
+      },
+      &seccomp_fork);
+
+  StartIntercept(&output_fd, dump_type);
+  FinishCrasher();
+  AssertDeath(0);
+  FinishIntercept(&intercept_result);
+  ASSERT_EQ(1, intercept_result) << "tombstoned reported failure";
+
+  std::string result;
+  ConsumeFd(std::move(output_fd), &result);
+  ASSERT_BACKTRACE_FRAME(result, "raise_debugger_signal");
+  ASSERT_BACKTRACE_FRAME(result, "foo");
+  ASSERT_BACKTRACE_FRAME(result, "bar");
+  ASSERT_BACKTRACE_FRAME(result, "main");
+}
+
 TEST_F(CrasherTest, seccomp_crash_logcat) {
   StartProcess([]() { abort(); }, &seccomp_fork);
   FinishCrasher();
diff --git a/debuggerd/handler/debuggerd_fallback.cpp b/debuggerd/handler/debuggerd_fallback.cpp
index c8b25ae..4721391 100644
--- a/debuggerd/handler/debuggerd_fallback.cpp
+++ b/debuggerd/handler/debuggerd_fallback.cpp
@@ -31,12 +31,9 @@
 #include <android-base/unique_fd.h>
 #include <async_safe/log.h>
 #include <bionic/reserved_signals.h>
-#include <unwindstack/DexFiles.h>
-#include <unwindstack/JitDebug.h>
-#include <unwindstack/Maps.h>
+#include <unwindstack/AndroidUnwinder.h>
 #include <unwindstack/Memory.h>
 #include <unwindstack/Regs.h>
-#include <unwindstack/Unwinder.h>
 
 #include "debuggerd/handler.h"
 #include "handler/fallback.h"
@@ -75,11 +72,11 @@
 
     // Do not use the thread cache here because it will call pthread_key_create
     // which doesn't work in linker code. See b/189803009.
-    // Use a normal cached object because the process is stopped, and there
+    // Use a normal cached object because the thread is stopped, and there
     // is no chance of data changing between reads.
     auto process_memory = unwindstack::Memory::CreateProcessMemoryCached(getpid());
     // TODO: Create this once and store it in a global?
-    unwindstack::UnwinderFromPid unwinder(kMaxFrames, getpid(), process_memory);
+    unwindstack::AndroidLocalUnwinder unwinder(process_memory);
     dump_backtrace_thread(output_fd, &unwinder, thread);
   }
   __linker_disable_fallback_allocator();
@@ -213,7 +210,10 @@
 
   // Send a signal to all of our siblings, asking them to dump their stack.
   pid_t current_tid = gettid();
-  if (!iterate_tids(current_tid, [&output_fd](pid_t tid) {
+  if (!iterate_tids(current_tid, [&output_fd, &current_tid](pid_t tid) {
+        if (current_tid == tid) {
+          return;
+        }
         // Use a pipe, to be able to detect situations where the thread gracefully exits before
         // receiving our signal.
         unique_fd pipe_read, pipe_write;
diff --git a/debuggerd/handler/debuggerd_handler.cpp b/debuggerd/handler/debuggerd_handler.cpp
index 35be2bf..37dbe86 100644
--- a/debuggerd/handler/debuggerd_handler.cpp
+++ b/debuggerd/handler/debuggerd_handler.cpp
@@ -24,6 +24,7 @@
 #include <sched.h>
 #include <signal.h>
 #include <stddef.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -38,6 +39,8 @@
 #include <unistd.h>
 
 #include <android-base/macros.h>
+#include <android-base/parsebool.h>
+#include <android-base/properties.h>
 #include <android-base/unique_fd.h>
 #include <async_safe/log.h>
 #include <bionic/reserved_signals.h>
@@ -49,7 +52,9 @@
 
 #include "handler/fallback.h"
 
-using android::base::Pipe;
+using ::android::base::ParseBool;
+using ::android::base::ParseBoolResult;
+using ::android::base::Pipe;
 
 // We muck with our fds in a 'thread' that doesn't share the same fd table.
 // Close fds in that thread with a raw close syscall instead of going through libc.
@@ -82,6 +87,34 @@
   return syscall(__NR_gettid);
 }
 
+static bool property_parse_bool(const char* name) {
+  const prop_info* pi = __system_property_find(name);
+  if (!pi) return false;
+  bool cookie = false;
+  __system_property_read_callback(
+      pi,
+      [](void* cookie, const char*, const char* value, uint32_t) {
+        *reinterpret_cast<bool*>(cookie) = ParseBool(value) == ParseBoolResult::kTrue;
+      },
+      &cookie);
+  return cookie;
+}
+
+static bool is_permissive_mte() {
+  // Environment variable for testing or local use from shell.
+  char* permissive_env = getenv("MTE_PERMISSIVE");
+  char process_sysprop_name[512];
+  async_safe_format_buffer(process_sysprop_name, sizeof(process_sysprop_name),
+                           "persist.device_config.memory_safety_native.permissive.process.%s",
+                           getprogname());
+  // DO NOT REPLACE this with GetBoolProperty. That uses std::string which allocates, so it is
+  // not async-safe (and this functiong gets used in a signal handler).
+  return property_parse_bool("persist.sys.mte.permissive") ||
+         property_parse_bool("persist.device_config.memory_safety_native.permissive.default") ||
+         property_parse_bool(process_sysprop_name) ||
+         (permissive_env && ParseBool(permissive_env) == ParseBoolResult::kTrue);
+}
+
 static inline void futex_wait(volatile void* ftx, int value) {
   syscall(__NR_futex, ftx, FUTEX_WAIT, value, nullptr, nullptr, 0);
 }
@@ -154,27 +187,29 @@
  * mutex is being held, so we don't want to use any libc functions that
  * could allocate memory or hold a lock.
  */
-static void log_signal_summary(const siginfo_t* info) {
+static void log_signal_summary(const siginfo_t* si) {
   char main_thread_name[MAX_TASK_NAME_LEN + 1];
   if (!get_main_thread_name(main_thread_name, sizeof(main_thread_name))) {
     strncpy(main_thread_name, "<unknown>", sizeof(main_thread_name));
   }
 
-  if (info->si_signo == BIONIC_SIGNAL_DEBUGGER) {
+  if (si->si_signo == BIONIC_SIGNAL_DEBUGGER) {
     async_safe_format_log(ANDROID_LOG_INFO, "libc", "Requested dump for pid %d (%s)", __getpid(),
                           main_thread_name);
     return;
   }
 
-  // Many signals don't have an address or sender.
-  char addr_desc[32] = "";  // ", fault addr 0x1234"
-  if (signal_has_si_addr(info)) {
-    async_safe_format_buffer(addr_desc, sizeof(addr_desc), ", fault addr %p", info->si_addr);
-  }
+  // Many signals don't have a sender or extra detail, but some do...
   pid_t self_pid = __getpid();
   char sender_desc[32] = {};  // " from pid 1234, uid 666"
-  if (signal_has_sender(info, self_pid)) {
-    get_signal_sender(sender_desc, sizeof(sender_desc), info);
+  if (signal_has_sender(si, self_pid)) {
+    get_signal_sender(sender_desc, sizeof(sender_desc), si);
+  }
+  char extra_desc[32] = {};  // ", fault addr 0x1234" or ", syscall 1234"
+  if (si->si_signo == SIGSYS && si->si_code == SYS_SECCOMP) {
+    async_safe_format_buffer(extra_desc, sizeof(extra_desc), ", syscall %d", si->si_syscall);
+  } else if (signal_has_si_addr(si)) {
+    async_safe_format_buffer(extra_desc, sizeof(extra_desc), ", fault addr %p", si->si_addr);
   }
 
   char thread_name[MAX_TASK_NAME_LEN + 1];  // one more for termination
@@ -188,8 +223,8 @@
 
   async_safe_format_log(ANDROID_LOG_FATAL, "libc",
                         "Fatal signal %d (%s), code %d (%s%s)%s in tid %d (%s), pid %d (%s)",
-                        info->si_signo, get_signame(info), info->si_code, get_sigcode(info),
-                        sender_desc, addr_desc, __gettid(), thread_name, self_pid, main_thread_name);
+                        si->si_signo, get_signame(si), si->si_code, get_sigcode(si), sender_desc,
+                        extra_desc, __gettid(), thread_name, self_pid, main_thread_name);
 }
 
 /*
@@ -338,12 +373,29 @@
       {.iov_base = thread_info->ucontext, .iov_len = sizeof(ucontext_t)},
   };
 
+  constexpr size_t kHeaderSize = sizeof(version) + sizeof(siginfo_t) + sizeof(ucontext_t);
+
   if (thread_info->process_info.fdsan_table) {
     // Dynamic executables always use version 4. There is no need to increment the version number if
     // the format changes, because the sender (linker) and receiver (crash_dump) are version locked.
     version = 4;
     expected = sizeof(CrashInfoHeader) + sizeof(CrashInfoDataDynamic);
 
+    static_assert(sizeof(CrashInfoHeader) + sizeof(CrashInfoDataDynamic) ==
+                      kHeaderSize + sizeof(thread_info->process_info),
+                  "Wire protocol structs do not match the data sent.");
+#define ASSERT_SAME_OFFSET(MEMBER1, MEMBER2) \
+    static_assert(sizeof(CrashInfoHeader) + offsetof(CrashInfoDataDynamic, MEMBER1) == \
+                      kHeaderSize + offsetof(debugger_process_info, MEMBER2), \
+                  "Wire protocol offset does not match data sent: " #MEMBER1);
+    ASSERT_SAME_OFFSET(fdsan_table_address, fdsan_table);
+    ASSERT_SAME_OFFSET(gwp_asan_state, gwp_asan_state);
+    ASSERT_SAME_OFFSET(gwp_asan_metadata, gwp_asan_metadata);
+    ASSERT_SAME_OFFSET(scudo_stack_depot, scudo_stack_depot);
+    ASSERT_SAME_OFFSET(scudo_region_info, scudo_region_info);
+    ASSERT_SAME_OFFSET(scudo_ring_buffer, scudo_ring_buffer);
+#undef ASSERT_SAME_OFFSET
+
     iovs[3] = {.iov_base = &thread_info->process_info,
                .iov_len = sizeof(thread_info->process_info)};
   } else {
@@ -351,6 +403,10 @@
     version = 1;
     expected = sizeof(CrashInfoHeader) + sizeof(CrashInfoDataStatic);
 
+    static_assert(
+        sizeof(CrashInfoHeader) + sizeof(CrashInfoDataStatic) == kHeaderSize + sizeof(uintptr_t),
+        "Wire protocol structs do not match the data sent.");
+
     iovs[3] = {.iov_base = &thread_info->process_info.abort_msg, .iov_len = sizeof(uintptr_t)};
   }
   errno = 0;
@@ -592,7 +648,40 @@
     // If the signal is fatal, don't unlock the mutex to prevent other crashing threads from
     // starting to dump right before our death.
     pthread_mutex_unlock(&crash_mutex);
-  } else {
+  }
+#ifdef __aarch64__
+  else if (info->si_signo == SIGSEGV &&
+           (info->si_code == SEGV_MTESERR || info->si_code == SEGV_MTEAERR) &&
+           is_permissive_mte()) {
+    // If we are in permissive MTE mode, we do not crash, but instead disable MTE on this thread,
+    // and then let the failing instruction be retried. The second time should work (except
+    // if there is another non-MTE fault).
+    int tagged_addr_ctrl = prctl(PR_GET_TAGGED_ADDR_CTRL, 0, 0, 0, 0);
+    if (tagged_addr_ctrl < 0) {
+      fatal_errno("failed to PR_GET_TAGGED_ADDR_CTRL");
+    }
+    tagged_addr_ctrl = (tagged_addr_ctrl & ~PR_MTE_TCF_MASK) | PR_MTE_TCF_NONE;
+    if (prctl(PR_SET_TAGGED_ADDR_CTRL, tagged_addr_ctrl, 0, 0, 0) < 0) {
+      fatal_errno("failed to PR_SET_TAGGED_ADDR_CTRL");
+    }
+    async_safe_format_log(ANDROID_LOG_ERROR, "libc",
+                          "MTE ERROR DETECTED BUT RUNNING IN PERMISSIVE MODE. CONTINUING.");
+    pthread_mutex_unlock(&crash_mutex);
+  } else if (info->si_signo == SIGSEGV && info->si_code == SEGV_MTEAERR && getppid() == 1) {
+    // Back channel to init (see system/core/init/service.cpp) to signal that
+    // this process crashed due to an ASYNC MTE fault and should be considered
+    // for upgrade to SYNC mode. We are re-using the ART profiler signal, which
+    // is always handled (ignored in native processes, handled for generating a
+    // dump in ART processes), so a process will never crash from this signal
+    // except from here.
+    // The kernel is not particularly receptive to adding this information:
+    // https://lore.kernel.org/all/20220909180617.374238-1-fmayer@google.com/, so we work around
+    // like this.
+    info->si_signo = BIONIC_SIGNAL_ART_PROFILER;
+    resend_signal(info);
+  }
+#endif
+  else {
     // Resend the signal, so that either the debugger or the parent's waitpid sees it.
     resend_signal(info);
   }
diff --git a/debuggerd/include/debuggerd/handler.h b/debuggerd/include/debuggerd/handler.h
index bc08327..68b2e67 100644
--- a/debuggerd/include/debuggerd/handler.h
+++ b/debuggerd/include/debuggerd/handler.h
@@ -62,10 +62,11 @@
 #define DEBUGGER_SIGNAL BIONIC_SIGNAL_DEBUGGER
 
 static void __attribute__((__unused__)) debuggerd_register_handlers(struct sigaction* action) {
+  bool enabled = true;
+#if ANDROID_DEBUGGABLE
   char value[PROP_VALUE_MAX] = "";
-  bool enabled =
-      !(__system_property_get("ro.debuggable", value) > 0 && !strcmp(value, "1") &&
-        __system_property_get("debug.debuggerd.disable", value) > 0 && !strcmp(value, "1"));
+  enabled = !(__system_property_get("debug.debuggerd.disable", value) > 0 && !strcmp(value, "1"));
+#endif
   if (enabled) {
     sigaction(SIGABRT, action, nullptr);
     sigaction(SIGBUS, action, nullptr);
diff --git a/debuggerd/libdebuggerd/backtrace.cpp b/debuggerd/libdebuggerd/backtrace.cpp
index fd91038..3ff9710 100644
--- a/debuggerd/libdebuggerd/backtrace.cpp
+++ b/debuggerd/libdebuggerd/backtrace.cpp
@@ -37,6 +37,7 @@
 #include <android-base/strings.h>
 #include <android-base/unique_fd.h>
 #include <log/log.h>
+#include <unwindstack/AndroidUnwinder.h>
 #include <unwindstack/Unwinder.h>
 
 #include "libdebuggerd/types.h"
@@ -57,7 +58,7 @@
   _LOG(log, logtype::BACKTRACE, "\n----- end %d -----\n", pid);
 }
 
-void dump_backtrace_thread(int output_fd, unwindstack::Unwinder* unwinder,
+void dump_backtrace_thread(int output_fd, unwindstack::AndroidUnwinder* unwinder,
                            const ThreadInfo& thread) {
   log_t log;
   log.tfd = output_fd;
@@ -65,21 +66,17 @@
 
   _LOG(&log, logtype::BACKTRACE, "\n\"%s\" sysTid=%d\n", thread.thread_name.c_str(), thread.tid);
 
-  unwinder->SetRegs(thread.registers.get());
-  unwinder->Unwind();
-  if (unwinder->NumFrames() == 0) {
-    _LOG(&log, logtype::THREAD, "Unwind failed: tid = %d\n", thread.tid);
-    if (unwinder->LastErrorCode() != unwindstack::ERROR_NONE) {
-      _LOG(&log, logtype::THREAD, "  Error code: %s\n", unwinder->LastErrorCodeString());
-      _LOG(&log, logtype::THREAD, "  Error address: 0x%" PRIx64 "\n", unwinder->LastErrorAddress());
-    }
+  unwindstack::AndroidUnwinderData data;
+  if (!unwinder->Unwind(thread.registers.get(), data)) {
+    _LOG(&log, logtype::THREAD, "Unwind failed: tid = %d: Error %s\n", thread.tid,
+         data.GetErrorString().c_str());
     return;
   }
 
-  log_backtrace(&log, unwinder, "  ");
+  log_backtrace(&log, unwinder, data, "  ");
 }
 
-void dump_backtrace(android::base::unique_fd output_fd, unwindstack::Unwinder* unwinder,
+void dump_backtrace(android::base::unique_fd output_fd, unwindstack::AndroidUnwinder* unwinder,
                     const std::map<pid_t, ThreadInfo>& thread_info, pid_t target_thread) {
   log_t log;
   log.tfd = output_fd.get();
diff --git a/debuggerd/libdebuggerd/gwp_asan.cpp b/debuggerd/libdebuggerd/gwp_asan.cpp
index 3d96627..d8f74e0 100644
--- a/debuggerd/libdebuggerd/gwp_asan.cpp
+++ b/debuggerd/libdebuggerd/gwp_asan.cpp
@@ -21,9 +21,8 @@
 #include "gwp_asan/common.h"
 #include "gwp_asan/crash_handler.h"
 
-#include <unwindstack/Maps.h>
+#include <unwindstack/AndroidUnwinder.h>
 #include <unwindstack/Memory.h>
-#include <unwindstack/Regs.h>
 #include <unwindstack/Unwinder.h>
 
 #include "tombstone.pb.h"
@@ -106,7 +105,8 @@
 
 constexpr size_t kMaxTraceLength = gwp_asan::AllocationMetadata::kMaxTraceLengthToCollect;
 
-void GwpAsanCrashData::AddCauseProtos(Tombstone* tombstone, unwindstack::Unwinder* unwinder) const {
+void GwpAsanCrashData::AddCauseProtos(Tombstone* tombstone,
+                                      unwindstack::AndroidUnwinder* unwinder) const {
   if (!CrashIsMine()) {
     ALOGE("Internal Error: AddCauseProtos() on a non-GWP-ASan crash.");
     return;
@@ -140,7 +140,6 @@
 
   heap_object->set_address(__gwp_asan_get_allocation_address(responsible_allocation_));
   heap_object->set_size(__gwp_asan_get_allocation_size(responsible_allocation_));
-  unwinder->SetDisplayBuildID(true);
 
   std::unique_ptr<uintptr_t[]> frames(new uintptr_t[kMaxTraceLength]);
 
diff --git a/debuggerd/libdebuggerd/include/libdebuggerd/backtrace.h b/debuggerd/libdebuggerd/include/libdebuggerd/backtrace.h
index c20d090..531afea 100644
--- a/debuggerd/libdebuggerd/include/libdebuggerd/backtrace.h
+++ b/debuggerd/libdebuggerd/include/libdebuggerd/backtrace.h
@@ -30,16 +30,16 @@
 
 // Forward delcaration
 namespace unwindstack {
-class Unwinder;
+class AndroidUnwinder;
 }
 
 // Dumps a backtrace using a format similar to what Dalvik uses so that the result
 // can be intermixed in a bug report.
-void dump_backtrace(android::base::unique_fd output_fd, unwindstack::Unwinder* unwinder,
+void dump_backtrace(android::base::unique_fd output_fd, unwindstack::AndroidUnwinder* unwinder,
                     const std::map<pid_t, ThreadInfo>& thread_info, pid_t target_thread);
 
 void dump_backtrace_header(int output_fd);
-void dump_backtrace_thread(int output_fd, unwindstack::Unwinder* unwinder,
+void dump_backtrace_thread(int output_fd, unwindstack::AndroidUnwinder* unwinder,
                            const ThreadInfo& thread);
 void dump_backtrace_footer(int output_fd);
 
diff --git a/debuggerd/libdebuggerd/include/libdebuggerd/gwp_asan.h b/debuggerd/libdebuggerd/include/libdebuggerd/gwp_asan.h
index a979370..0429643 100644
--- a/debuggerd/libdebuggerd/include/libdebuggerd/gwp_asan.h
+++ b/debuggerd/libdebuggerd/include/libdebuggerd/gwp_asan.h
@@ -26,9 +26,15 @@
 #include "types.h"
 #include "utility.h"
 
+// Forward delcarations
 class Cause;
 class Tombstone;
 
+namespace unwindstack {
+class AndroidUnwinder;
+class Memory;
+}  // namespace unwindstack
+
 class GwpAsanCrashData {
  public:
   GwpAsanCrashData() = delete;
@@ -52,7 +58,7 @@
   // allocator crash state.
   uintptr_t GetFaultAddress() const;
 
-  void AddCauseProtos(Tombstone* tombstone, unwindstack::Unwinder* unwinder) const;
+  void AddCauseProtos(Tombstone* tombstone, unwindstack::AndroidUnwinder* unwinder) const;
 
  protected:
   // Is GWP-ASan responsible for this crash.
diff --git a/debuggerd/libdebuggerd/include/libdebuggerd/scudo.h b/debuggerd/libdebuggerd/include/libdebuggerd/scudo.h
index 172ffe9..a506859 100644
--- a/debuggerd/libdebuggerd/include/libdebuggerd/scudo.h
+++ b/debuggerd/libdebuggerd/include/libdebuggerd/scudo.h
@@ -23,9 +23,15 @@
 
 #include "scudo/interface.h"
 
+// Forward delcarations
 class Cause;
 class Tombstone;
 
+namespace unwindstack {
+class AndroidUnwinder;
+class Memory;
+}  // namespace unwindstack
+
 class ScudoCrashData {
  public:
   ScudoCrashData() = delete;
@@ -34,12 +40,12 @@
 
   bool CrashIsMine() const;
 
-  void AddCauseProtos(Tombstone* tombstone, unwindstack::Unwinder* unwinder) const;
+  void AddCauseProtos(Tombstone* tombstone, unwindstack::AndroidUnwinder* unwinder) const;
 
  private:
   scudo_error_info error_info_ = {};
   uintptr_t untagged_fault_addr_;
 
   void FillInCause(Cause* cause, const scudo_error_report* report,
-                   unwindstack::Unwinder* unwinder) const;
+                   unwindstack::AndroidUnwinder* unwinder) const;
 };
diff --git a/debuggerd/libdebuggerd/include/libdebuggerd/tombstone.h b/debuggerd/libdebuggerd/include/libdebuggerd/tombstone.h
index 7bf1688..be999e0 100644
--- a/debuggerd/libdebuggerd/include/libdebuggerd/tombstone.h
+++ b/debuggerd/libdebuggerd/include/libdebuggerd/tombstone.h
@@ -37,7 +37,7 @@
 
 namespace unwindstack {
 struct FrameData;
-class Unwinder;
+class AndroidUnwinder;
 }
 
 // The maximum number of frames to save when unwinding.
@@ -51,7 +51,7 @@
 
 /* Creates a tombstone file and writes the crash dump to it. */
 void engrave_tombstone(android::base::unique_fd output_fd, android::base::unique_fd proto_fd,
-                       unwindstack::Unwinder* unwinder,
+                       unwindstack::AndroidUnwinder* unwinder,
                        const std::map<pid_t, ThreadInfo>& thread_info, pid_t target_thread,
                        const ProcessInfo& process_info, OpenFilesList* open_files,
                        std::string* amfd_data);
@@ -59,7 +59,7 @@
 void engrave_tombstone_ucontext(int tombstone_fd, int proto_fd, uint64_t abort_msg_address,
                                 siginfo_t* siginfo, ucontext_t* ucontext);
 
-void engrave_tombstone_proto(Tombstone* tombstone, unwindstack::Unwinder* unwinder,
+void engrave_tombstone_proto(Tombstone* tombstone, unwindstack::AndroidUnwinder* unwinder,
                              const std::map<pid_t, ThreadInfo>& threads, pid_t target_thread,
                              const ProcessInfo& process_info, const OpenFilesList* open_files);
 
diff --git a/debuggerd/libdebuggerd/include/libdebuggerd/utility.h b/debuggerd/libdebuggerd/include/libdebuggerd/utility.h
index 63e142f..25b03af 100644
--- a/debuggerd/libdebuggerd/include/libdebuggerd/utility.h
+++ b/debuggerd/libdebuggerd/include/libdebuggerd/utility.h
@@ -73,11 +73,13 @@
 void _VLOG(log_t* log, logtype ltype, const char* fmt, va_list ap);
 
 namespace unwindstack {
-class Unwinder;
+class AndroidUnwinder;
 class Memory;
+struct AndroidUnwinderData;
 }
 
-void log_backtrace(log_t* log, unwindstack::Unwinder* unwinder, const char* prefix);
+void log_backtrace(log_t* log, unwindstack::AndroidUnwinder* unwinder,
+                   unwindstack::AndroidUnwinderData& data, const char* prefix);
 
 ssize_t dump_memory(void* out, size_t len, uint8_t* tags, size_t tags_len, uint64_t* addr,
                     unwindstack::Memory* memory);
diff --git a/debuggerd/libdebuggerd/scudo.cpp b/debuggerd/libdebuggerd/scudo.cpp
index a4836d7..5d861f8 100644
--- a/debuggerd/libdebuggerd/scudo.cpp
+++ b/debuggerd/libdebuggerd/scudo.cpp
@@ -17,8 +17,8 @@
 #include "libdebuggerd/scudo.h"
 #include "libdebuggerd/tombstone.h"
 
+#include "unwindstack/AndroidUnwinder.h"
 #include "unwindstack/Memory.h"
-#include "unwindstack/Unwinder.h"
 
 #include <android-base/macros.h>
 #include <bionic/macros.h>
@@ -46,6 +46,9 @@
                                        __scudo_get_region_info_size());
   auto ring_buffer = AllocAndReadFully(process_memory, process_info.scudo_ring_buffer,
                                        __scudo_get_ring_buffer_size());
+  if (!stack_depot || !region_info || !ring_buffer) {
+    return;
+  }
 
   untagged_fault_addr_ = process_info.untagged_fault_address;
   uintptr_t fault_page = untagged_fault_addr_ & ~(PAGE_SIZE - 1);
@@ -80,7 +83,7 @@
 }
 
 void ScudoCrashData::FillInCause(Cause* cause, const scudo_error_report* report,
-                                 unwindstack::Unwinder* unwinder) const {
+                                 unwindstack::AndroidUnwinder* unwinder) const {
   MemoryError* memory_error = cause->mutable_memory_error();
   HeapObject* heap_object = memory_error->mutable_heap();
 
@@ -102,7 +105,6 @@
 
   heap_object->set_address(report->allocation_address);
   heap_object->set_size(report->allocation_size);
-  unwinder->SetDisplayBuildID(true);
 
   heap_object->set_allocation_tid(report->allocation_tid);
   for (size_t i = 0; i < arraysize(report->allocation_trace) && report->allocation_trace[i]; ++i) {
@@ -123,7 +125,8 @@
   set_human_readable_cause(cause, untagged_fault_addr_);
 }
 
-void ScudoCrashData::AddCauseProtos(Tombstone* tombstone, unwindstack::Unwinder* unwinder) const {
+void ScudoCrashData::AddCauseProtos(Tombstone* tombstone,
+                                    unwindstack::AndroidUnwinder* unwinder) const {
   size_t report_num = 0;
   while (report_num < sizeof(error_info_.reports) / sizeof(error_info_.reports[0]) &&
          error_info_.reports[report_num].error_type != UNKNOWN) {
diff --git a/debuggerd/libdebuggerd/tombstone.cpp b/debuggerd/libdebuggerd/tombstone.cpp
index eda7182..375ed8a 100644
--- a/debuggerd/libdebuggerd/tombstone.cpp
+++ b/debuggerd/libdebuggerd/tombstone.cpp
@@ -36,9 +36,9 @@
 #include <async_safe/log.h>
 #include <log/log.h>
 #include <private/android_filesystem_config.h>
-#include <unwindstack/Memory.h>
+#include <unwindstack/AndroidUnwinder.h>
+#include <unwindstack/Error.h>
 #include <unwindstack/Regs.h>
-#include <unwindstack/Unwinder.h>
 
 #include "libdebuggerd/backtrace.h"
 #include "libdebuggerd/open_files_list.h"
@@ -55,15 +55,15 @@
                                 siginfo_t* siginfo, ucontext_t* ucontext) {
   pid_t uid = getuid();
   pid_t pid = getpid();
-  pid_t tid = gettid();
+  pid_t target_tid = gettid();
 
   log_t log;
-  log.current_tid = tid;
-  log.crashed_tid = tid;
+  log.current_tid = target_tid;
+  log.crashed_tid = target_tid;
   log.tfd = tombstone_fd;
   log.amfd_data = nullptr;
 
-  std::string thread_name = get_thread_name(tid);
+  std::string thread_name = get_thread_name(target_tid);
   std::vector<std::string> command_line = get_command_line(pid);
 
   std::unique_ptr<unwindstack::Regs> regs(
@@ -73,50 +73,56 @@
   android::base::ReadFileToString("/proc/self/attr/current", &selinux_label);
 
   std::map<pid_t, ThreadInfo> threads;
-  threads[tid] = ThreadInfo{
-    .registers = std::move(regs), .uid = uid, .tid = tid, .thread_name = std::move(thread_name),
-    .pid = pid, .command_line = std::move(command_line), .selinux_label = std::move(selinux_label),
-    .siginfo = siginfo,
-#if defined(__aarch64__)
+  threads[target_tid] = ThreadInfo {
+    .registers = std::move(regs), .uid = uid, .tid = target_tid,
+    .thread_name = std::move(thread_name), .pid = pid, .command_line = std::move(command_line),
+    .selinux_label = std::move(selinux_label), .siginfo = siginfo,
     // Only supported on aarch64 for now.
-        .tagged_addr_ctrl = prctl(PR_GET_TAGGED_ADDR_CTRL, 0, 0, 0, 0),
+#if defined(__aarch64__)
+    .tagged_addr_ctrl = prctl(PR_GET_TAGGED_ADDR_CTRL, 0, 0, 0, 0),
     .pac_enabled_keys = prctl(PR_PAC_GET_ENABLED_KEYS, 0, 0, 0, 0),
 #endif
   };
-  if (pid == tid) {
-    const ThreadInfo& thread = threads[pid];
-    if (!iterate_tids(pid, [&threads, &thread](pid_t tid) {
-          threads[tid] = ThreadInfo{
-              .uid = thread.uid,
-              .tid = tid,
-              .pid = thread.pid,
-              .command_line = thread.command_line,
-              .thread_name = get_thread_name(tid),
-              .tagged_addr_ctrl = thread.tagged_addr_ctrl,
-              .pac_enabled_keys = thread.pac_enabled_keys,
-          };
-        })) {
-      async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "failed to open /proc/%d/task: %s", pid,
-                            strerror(errno));
-    }
+  const ThreadInfo& thread = threads[pid];
+  if (!iterate_tids(pid, [&threads, &thread, &target_tid](pid_t tid) {
+        if (target_tid == tid) {
+          return;
+        }
+        threads[tid] = ThreadInfo{
+            .uid = thread.uid,
+            .tid = tid,
+            .pid = thread.pid,
+            .command_line = thread.command_line,
+            .thread_name = get_thread_name(tid),
+            .tagged_addr_ctrl = thread.tagged_addr_ctrl,
+            .pac_enabled_keys = thread.pac_enabled_keys,
+        };
+      })) {
+    async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "failed to open /proc/%d/task: %s", pid,
+                          strerror(errno));
   }
 
-  auto process_memory =
-      unwindstack::Memory::CreateProcessMemoryCached(getpid());
-  unwindstack::UnwinderFromPid unwinder(kMaxFrames, pid, unwindstack::Regs::CurrentArch(), nullptr,
-                                        process_memory);
-  if (!unwinder.Init()) {
-    async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "failed to init unwinder object");
+  // Do not use the thread cache here because it will call pthread_key_create
+  // which doesn't work in linker code. See b/189803009.
+  // Use a normal cached object because the thread is stopped, and there
+  // is no chance of data changing between reads.
+  auto process_memory = unwindstack::Memory::CreateProcessMemoryCached(getpid());
+  unwindstack::AndroidLocalUnwinder unwinder(process_memory);
+  unwindstack::ErrorData error;
+  if (!unwinder.Initialize(error)) {
+    async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "failed to init unwinder object: %s",
+                          unwindstack::GetErrorCodeString(error.code));
     return;
   }
 
   ProcessInfo process_info;
   process_info.abort_msg_address = abort_msg_address;
-  engrave_tombstone(unique_fd(dup(tombstone_fd)), unique_fd(dup(proto_fd)), &unwinder, threads, tid,
-                    process_info, nullptr, nullptr);
+  engrave_tombstone(unique_fd(dup(tombstone_fd)), unique_fd(dup(proto_fd)), &unwinder, threads,
+                    target_tid, process_info, nullptr, nullptr);
 }
 
-void engrave_tombstone(unique_fd output_fd, unique_fd proto_fd, unwindstack::Unwinder* unwinder,
+void engrave_tombstone(unique_fd output_fd, unique_fd proto_fd,
+                       unwindstack::AndroidUnwinder* unwinder,
                        const std::map<pid_t, ThreadInfo>& threads, pid_t target_thread,
                        const ProcessInfo& process_info, OpenFilesList* open_files,
                        std::string* amfd_data) {
diff --git a/debuggerd/libdebuggerd/tombstone_proto.cpp b/debuggerd/libdebuggerd/tombstone_proto.cpp
index bd05837..9a565de 100644
--- a/debuggerd/libdebuggerd/tombstone_proto.cpp
+++ b/debuggerd/libdebuggerd/tombstone_proto.cpp
@@ -56,10 +56,11 @@
 #include <private/android_filesystem_config.h>
 
 #include <procinfo/process.h>
+#include <unwindstack/AndroidUnwinder.h>
+#include <unwindstack/Error.h>
+#include <unwindstack/MapInfo.h>
 #include <unwindstack/Maps.h>
-#include <unwindstack/Memory.h>
 #include <unwindstack/Regs.h>
-#include <unwindstack/Unwinder.h>
 
 #include "libdebuggerd/open_files_list.h"
 #include "libdebuggerd/utility.h"
@@ -81,6 +82,8 @@
   return Architecture::X86;
 #elif defined(__x86_64__)
   return Architecture::X86_64;
+#elif defined(__riscv) && (__riscv_xlen == 64)
+  return Architecture::RISCV64;
 #else
 #error Unknown architecture!
 #endif
@@ -189,7 +192,7 @@
       error_type_str, diff, byte_suffix, location_str, heap_object.size(), heap_object.address()));
 }
 
-static void dump_probable_cause(Tombstone* tombstone, unwindstack::Unwinder* unwinder,
+static void dump_probable_cause(Tombstone* tombstone, unwindstack::AndroidUnwinder* unwinder,
                                 const ProcessInfo& process_info, const ThreadInfo& main_thread) {
 #if defined(USE_SCUDO)
   ScudoCrashData scudo_crash_data(unwinder->GetProcessMemory().get(), process_info);
@@ -245,9 +248,9 @@
   }
 }
 
-static void dump_abort_message(Tombstone* tombstone, unwindstack::Unwinder* unwinder,
+static void dump_abort_message(Tombstone* tombstone,
+                               std::shared_ptr<unwindstack::Memory>& process_memory,
                                const ProcessInfo& process_info) {
-  std::shared_ptr<unwindstack::Memory> process_memory = unwinder->GetProcessMemory();
   uintptr_t address = process_info.abort_msg_address;
   if (address == 0) {
     return;
@@ -348,7 +351,7 @@
   f->set_build_id(frame.map_info->GetPrintableBuildID());
 }
 
-static void dump_registers(unwindstack::Unwinder* unwinder,
+static void dump_registers(unwindstack::AndroidUnwinder* unwinder,
                            const std::unique_ptr<unwindstack::Regs>& regs, Thread& thread,
                            bool memory_dump) {
   if (regs == nullptr) {
@@ -402,27 +405,9 @@
   });
 }
 
-static void log_unwinder_error(unwindstack::Unwinder* unwinder) {
-  if (unwinder->LastErrorCode() == unwindstack::ERROR_NONE) {
-    return;
-  }
-
-  async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "  error code: %s",
-                        unwinder->LastErrorCodeString());
-  async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "  error address: 0x%" PRIx64,
-                        unwinder->LastErrorAddress());
-}
-
-static void dump_thread_backtrace(unwindstack::Unwinder* unwinder, Thread& thread) {
-  if (unwinder->NumFrames() == 0) {
-    async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "failed to unwind");
-    log_unwinder_error(unwinder);
-    return;
-  }
-
-  unwinder->SetDisplayBuildID(true);
+static void dump_thread_backtrace(std::vector<unwindstack::FrameData>& frames, Thread& thread) {
   std::set<std::string> unreadable_elf_files;
-  for (const auto& frame : unwinder->frames()) {
+  for (const auto& frame : frames) {
     BacktraceFrame* f = thread.add_current_backtrace();
     fill_in_backtrace_frame(f, frame);
     if (frame.map_info != nullptr && frame.map_info->ElfFileNotReadable()) {
@@ -446,7 +431,7 @@
   }
 }
 
-static void dump_thread(Tombstone* tombstone, unwindstack::Unwinder* unwinder,
+static void dump_thread(Tombstone* tombstone, unwindstack::AndroidUnwinder* unwinder,
                         const ThreadInfo& thread_info, bool memory_dump = false) {
   Thread thread;
 
@@ -455,36 +440,29 @@
   thread.set_tagged_addr_ctrl(thread_info.tagged_addr_ctrl);
   thread.set_pac_enabled_keys(thread_info.pac_enabled_keys);
 
-  if (thread_info.registers == nullptr) {
-    // Fallback path for non-main thread, doing unwind from running process.
-    unwindstack::ThreadUnwinder thread_unwinder(kMaxFrames, unwinder->GetMaps());
-    if (!thread_unwinder.Init()) {
-      async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG,
-                            "Unable to initialize ThreadUnwinder object.");
-      log_unwinder_error(&thread_unwinder);
-      return;
-    }
-
-    std::unique_ptr<unwindstack::Regs> initial_regs;
-    thread_unwinder.UnwindWithSignal(BIONIC_SIGNAL_BACKTRACE, thread_info.tid, &initial_regs);
-    dump_registers(&thread_unwinder, initial_regs, thread, memory_dump);
-    dump_thread_backtrace(&thread_unwinder, thread);
+  unwindstack::AndroidUnwinderData data;
+  // Indicate we want a copy of the initial registers.
+  data.saved_initial_regs = std::make_optional<std::unique_ptr<unwindstack::Regs>>();
+  bool unwind_ret;
+  if (thread_info.registers != nullptr) {
+    unwind_ret = unwinder->Unwind(thread_info.registers.get(), data);
   } else {
-    dump_registers(unwinder, thread_info.registers, thread, memory_dump);
-    std::unique_ptr<unwindstack::Regs> regs_copy(thread_info.registers->Clone());
-    unwinder->SetRegs(regs_copy.get());
-    unwinder->Unwind();
-    dump_thread_backtrace(unwinder, thread);
+    unwind_ret = unwinder->Unwind(thread_info.tid, data);
   }
+  if (!unwind_ret) {
+    async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "Unwind failed for tid %d: Error %s",
+                          thread_info.tid, data.GetErrorString().c_str());
+  } else {
+    dump_thread_backtrace(data.frames, thread);
+  }
+  dump_registers(unwinder, *data.saved_initial_regs, thread, memory_dump);
 
   auto& threads = *tombstone->mutable_threads();
   threads[thread_info.tid] = thread;
 }
 
-static void dump_mappings(Tombstone* tombstone, unwindstack::Unwinder* unwinder) {
-  unwindstack::Maps* maps = unwinder->GetMaps();
-  std::shared_ptr<unwindstack::Memory> process_memory = unwinder->GetProcessMemory();
-
+static void dump_mappings(Tombstone* tombstone, unwindstack::Maps* maps,
+                          std::shared_ptr<unwindstack::Memory>& process_memory) {
   for (const auto& map_info : *maps) {
     auto* map = tombstone->add_memory_mappings();
     map->set_begin_address(map_info->start());
@@ -593,7 +571,8 @@
 }
 
 static void dump_tags_around_fault_addr(Signal* signal, const Tombstone& tombstone,
-                                        unwindstack::Unwinder* unwinder, uintptr_t fault_addr) {
+                                        std::shared_ptr<unwindstack::Memory>& process_memory,
+                                        uintptr_t fault_addr) {
   if (tombstone.arch() != Architecture::ARM64) return;
 
   fault_addr = untag_address(fault_addr);
@@ -604,8 +583,6 @@
   // a valid address for us to dump tags from.
   if (fault_addr < kBytesToRead / 2) return;
 
-  unwindstack::Memory* memory = unwinder->GetProcessMemory().get();
-
   constexpr uintptr_t kRowStartMask = ~(kNumTagColumns * kTagGranuleSize - 1);
   size_t start_address = (fault_addr & kRowStartMask) - kBytesToRead / 2;
   MemoryDump tag_dump;
@@ -614,7 +591,7 @@
   // Attempt to read the first tag. If reading fails, this likely indicates the
   // lowest touched page is inaccessible or not marked with PROT_MTE.
   // Fast-forward over pages until one has tags, or we exhaust the search range.
-  while (memory->ReadTag(start_address) < 0) {
+  while (process_memory->ReadTag(start_address) < 0) {
     size_t page_size = sysconf(_SC_PAGE_SIZE);
     size_t bytes_to_next_page = page_size - (start_address % page_size);
     if (bytes_to_next_page >= granules_to_read * kTagGranuleSize) return;
@@ -626,7 +603,7 @@
   std::string* mte_tags = tag_dump.mutable_arm_mte_metadata()->mutable_memory_tags();
 
   for (size_t i = 0; i < granules_to_read; ++i) {
-    long tag = memory->ReadTag(start_address + i * kTagGranuleSize);
+    long tag = process_memory->ReadTag(start_address + i * kTagGranuleSize);
     if (tag < 0) break;
     mte_tags->push_back(static_cast<uint8_t>(tag));
   }
@@ -636,7 +613,7 @@
   }
 }
 
-void engrave_tombstone_proto(Tombstone* tombstone, unwindstack::Unwinder* unwinder,
+void engrave_tombstone_proto(Tombstone* tombstone, unwindstack::AndroidUnwinder* unwinder,
                              const std::map<pid_t, ThreadInfo>& threads, pid_t target_thread,
                              const ProcessInfo& process_info, const OpenFilesList* open_files) {
   Tombstone result;
@@ -691,12 +668,12 @@
     sig.set_has_fault_address(true);
     uintptr_t fault_addr = process_info.maybe_tagged_fault_address;
     sig.set_fault_address(fault_addr);
-    dump_tags_around_fault_addr(&sig, result, unwinder, fault_addr);
+    dump_tags_around_fault_addr(&sig, result, unwinder->GetProcessMemory(), fault_addr);
   }
 
   *result.mutable_signal_info() = sig;
 
-  dump_abort_message(&result, unwinder, process_info);
+  dump_abort_message(&result, unwinder->GetProcessMemory(), process_info);
 
   // Dump the main thread, but save the memory around the registers.
   dump_thread(&result, unwinder, main_thread, /* memory_dump */ true);
@@ -709,7 +686,7 @@
 
   dump_probable_cause(&result, unwinder, process_info, main_thread);
 
-  dump_mappings(&result, unwinder);
+  dump_mappings(&result, unwinder->GetMaps(), unwinder->GetProcessMemory());
 
   // Only dump logs on debuggable devices.
   if (android::base::GetBoolProperty("ro.debuggable", false)) {
diff --git a/debuggerd/libdebuggerd/tombstone_proto_to_text.cpp b/debuggerd/libdebuggerd/tombstone_proto_to_text.cpp
index 0265641..28154a7 100644
--- a/debuggerd/libdebuggerd/tombstone_proto_to_text.cpp
+++ b/debuggerd/libdebuggerd/tombstone_proto_to_text.cpp
@@ -47,6 +47,8 @@
       return "arm";
     case Architecture::ARM64:
       return "arm64";
+    case Architecture::RISCV64:
+      return "riscv64";
     case Architecture::X86:
       return "x86";
     case Architecture::X86_64:
@@ -62,6 +64,8 @@
       return 4;
     case Architecture::ARM64:
       return 8;
+    case Architecture::RISCV64:
+      return 8;
     case Architecture::X86:
       return 4;
     case Architecture::X86_64:
@@ -119,6 +123,10 @@
       special_registers = {"ip", "lr", "sp", "pc", "pst"};
       break;
 
+    case Architecture::RISCV64:
+      special_registers = {"ra", "sp", "pc"};
+      break;
+
     case Architecture::X86:
       special_registers = {"ebp", "esp", "eip"};
       break;
diff --git a/debuggerd/libdebuggerd/utility.cpp b/debuggerd/libdebuggerd/utility.cpp
index ecd98a4..74a1423 100644
--- a/debuggerd/libdebuggerd/utility.cpp
+++ b/debuggerd/libdebuggerd/utility.cpp
@@ -39,6 +39,7 @@
 #include <bionic/reserved_signals.h>
 #include <debuggerd/handler.h>
 #include <log/log.h>
+#include <unwindstack/AndroidUnwinder.h>
 #include <unwindstack/Memory.h>
 #include <unwindstack/Unwinder.h>
 
@@ -483,10 +484,10 @@
   return describe_end(value, desc);
 }
 
-void log_backtrace(log_t* log, unwindstack::Unwinder* unwinder, const char* prefix) {
+void log_backtrace(log_t* log, unwindstack::AndroidUnwinder* unwinder,
+                   unwindstack::AndroidUnwinderData& data, const char* prefix) {
   std::set<std::string> unreadable_elf_files;
-  unwinder->SetDisplayBuildID(true);
-  for (const auto& frame : unwinder->frames()) {
+  for (const auto& frame : data.frames) {
     if (frame.map_info != nullptr && frame.map_info->ElfFileNotReadable()) {
       unreadable_elf_files.emplace(frame.map_info->name());
     }
@@ -509,7 +510,7 @@
     }
   }
 
-  for (const auto& frame : unwinder->frames()) {
+  for (const auto& frame : data.frames) {
     _LOG(log, logtype::BACKTRACE, "%s%s\n", prefix, unwinder->FormatFrame(frame).c_str());
   }
 }
diff --git a/debuggerd/proto/tombstone.proto b/debuggerd/proto/tombstone.proto
index a0f2f82..49865a2 100644
--- a/debuggerd/proto/tombstone.proto
+++ b/debuggerd/proto/tombstone.proto
@@ -1,3 +1,12 @@
+//
+// Protobuf definition for Android tombstones.
+//
+// An app can get hold of these for any `REASON_CRASH_NATIVE` instance of
+// `android.app.ApplicationExitInfo`.
+//
+// https://developer.android.com/reference/android/app/ApplicationExitInfo#getTraceInputStream()
+//
+
 syntax = "proto3";
 
 option java_package = "com.android.server.os";
@@ -39,8 +48,9 @@
   ARM64 = 1;
   X86 = 2;
   X86_64 = 3;
+  RISCV64 = 4;
 
-  reserved 4 to 999;
+  reserved 5 to 999;
 }
 
 message Signal {
diff --git a/debuggerd/seccomp_policy/crash_dump.riscv64.policy b/debuggerd/seccomp_policy/crash_dump.riscv64.policy
new file mode 100644
index 0000000..21887ab
--- /dev/null
+++ b/debuggerd/seccomp_policy/crash_dump.riscv64.policy
@@ -0,0 +1,37 @@
+read: 1
+write: 1
+exit: 1
+rt_sigreturn: 1
+exit_group: 1
+clock_gettime: 1
+gettimeofday: 1
+futex: 1
+getrandom: 1
+getpid: 1
+gettid: 1
+ppoll: 1
+pipe2: 1
+openat: 1
+dup: 1
+close: 1
+lseek: 1
+getdents64: 1
+faccessat: 1
+recvmsg: 1
+recvfrom: 1
+process_vm_readv: 1
+tgkill: 1
+rt_sigprocmask: 1
+rt_sigaction: 1
+rt_tgsigqueueinfo: 1
+prctl: arg0 == PR_GET_NO_NEW_PRIVS || arg0 == 0x53564d41 || arg0 == PR_PAC_RESET_KEYS
+madvise: 1
+mprotect: arg2 in 0x1|0x2
+munmap: 1
+getuid: 1
+fstat: 1
+mmap: arg2 in 0x1|0x2
+geteuid: 1
+getgid: 1
+getegid: 1
+getgroups: 1
diff --git a/debuggerd/seccomp_policy/generate.sh b/debuggerd/seccomp_policy/generate.sh
index 8c58b05..c467d9e 100755
--- a/debuggerd/seccomp_policy/generate.sh
+++ b/debuggerd/seccomp_policy/generate.sh
@@ -6,5 +6,6 @@
 CPP='cpp -undef -E -P crash_dump.policy.def'
 $CPP -D__arm__ -o crash_dump.arm.policy
 $CPP -D__aarch64__ -D__LP64__ -o crash_dump.arm64.policy
+$CPP -D__riscv -D__LP64__ -o crash_dump.riscv64.policy
 $CPP -D__i386__ -o crash_dump.x86.policy
 $CPP -D__x86_64__ -D__LP64__ -o crash_dump.x86_64.policy
diff --git a/debuggerd/test_permissive_mte/Android.bp b/debuggerd/test_permissive_mte/Android.bp
new file mode 100644
index 0000000..d3f7520
--- /dev/null
+++ b/debuggerd/test_permissive_mte/Android.bp
@@ -0,0 +1,39 @@
+// Copyright (C) 2022 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+cc_binary {
+  name: "mte_crash",
+  tidy: false,
+  srcs: ["mte_crash.cpp"],
+  sanitize: {
+    memtag_heap: true,
+    diag: {
+      memtag_heap: true,
+    },
+  },
+}
+
+java_test_host {
+    name: "permissive_mte_test",
+    libs: ["tradefed"],
+    static_libs: ["frameworks-base-hostutils", "cts-install-lib-host"],
+    srcs:  ["src/**/PermissiveMteTest.java", ":libtombstone_proto-src"],
+    data: [":mte_crash"],
+    test_config: "AndroidTest.xml",
+    test_suites: ["general-tests"],
+}
diff --git a/debuggerd/test_permissive_mte/AndroidTest.xml b/debuggerd/test_permissive_mte/AndroidTest.xml
new file mode 100644
index 0000000..bd3d018
--- /dev/null
+++ b/debuggerd/test_permissive_mte/AndroidTest.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2022 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<configuration description="Runs the permissive MTE tests">
+    <option name="test-suite-tag" value="init_test_upgrade_mte" />
+    <option name="test-suite-tag" value="apct" />
+
+    <!-- For tombstone inspection. -->
+    <target_preparer class="com.android.tradefed.targetprep.RootTargetPreparer"/>
+    <target_preparer class="com.android.tradefed.targetprep.PushFilePreparer">
+      <option name="cleanup" value="true" />
+      <option name="push" value="mte_crash->/data/local/tmp/mte_crash" />
+    </target_preparer>
+    <test class="com.android.tradefed.testtype.HostTest" >
+        <option name="jar" value="permissive_mte_test.jar" />
+    </test>
+</configuration>
\ No newline at end of file
diff --git a/debuggerd/test_permissive_mte/mte_crash.cpp b/debuggerd/test_permissive_mte/mte_crash.cpp
new file mode 100644
index 0000000..97ad73f
--- /dev/null
+++ b/debuggerd/test_permissive_mte/mte_crash.cpp
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int, char**) {
+  volatile char* f = (char*)malloc(1);
+  printf("%c\n", f[17]);
+  return 0;
+}
diff --git a/debuggerd/test_permissive_mte/src/com/android/tests/debuggerd/PermissiveMteTest.java b/debuggerd/test_permissive_mte/src/com/android/tests/debuggerd/PermissiveMteTest.java
new file mode 100644
index 0000000..0203adc
--- /dev/null
+++ b/debuggerd/test_permissive_mte/src/com/android/tests/debuggerd/PermissiveMteTest.java
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.tests.init;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.junit.Assume.assumeTrue;
+
+import com.android.server.os.TombstoneProtos.Tombstone;
+import com.android.tradefed.testtype.DeviceJUnit4ClassRunner;
+import com.android.tradefed.testtype.junit4.BaseHostJUnit4Test;
+import com.android.tradefed.util.CommandResult;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.InputStream;
+import java.util.Arrays;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(DeviceJUnit4ClassRunner.class)
+public class PermissiveMteTest extends BaseHostJUnit4Test {
+  String mUUID;
+
+  @Before
+  public void setUp() throws Exception {
+    mUUID = java.util.UUID.randomUUID().toString();
+    CommandResult result =
+        getDevice().executeShellV2Command("/data/local/tmp/mte_crash setUp " + mUUID);
+    assumeTrue("mte_crash needs to segfault", result.getExitCode() == 139);
+  }
+
+  Tombstone parseTombstone(String tombstonePath) throws Exception {
+    File tombstoneFile = getDevice().pullFile(tombstonePath);
+    InputStream istr = new FileInputStream(tombstoneFile);
+    Tombstone tombstoneProto;
+    try {
+      tombstoneProto = Tombstone.parseFrom(istr);
+    } finally {
+      istr.close();
+    }
+    return tombstoneProto;
+  }
+
+  @After
+  public void tearDown() throws Exception {
+    String[] tombstones = getDevice().getChildren("/data/tombstones");
+    for (String tombstone : tombstones) {
+      if (!tombstone.endsWith(".pb")) {
+        continue;
+      }
+      String tombstonePath = "/data/tombstones/" + tombstone;
+      Tombstone tombstoneProto = parseTombstone(tombstonePath);
+      if (!tombstoneProto.getCommandLineList().stream().anyMatch(x -> x.contains(mUUID))) {
+        continue;
+      }
+      getDevice().deleteFile(tombstonePath);
+      // remove the non .pb file as well.
+      getDevice().deleteFile(tombstonePath.substring(0, tombstonePath.length() - 3));
+    }
+  }
+
+  @Test
+  public void testCrash() throws Exception {
+    CommandResult result = getDevice().executeShellV2Command(
+        "MTE_PERMISSIVE=1 /data/local/tmp/mte_crash testCrash " + mUUID);
+    assertThat(result.getExitCode()).isEqualTo(0);
+    int numberTombstones = 0;
+    String[] tombstones = getDevice().getChildren("/data/tombstones");
+    for (String tombstone : tombstones) {
+      if (!tombstone.endsWith(".pb")) {
+        continue;
+      }
+      String tombstonePath = "/data/tombstones/" + tombstone;
+      Tombstone tombstoneProto = parseTombstone(tombstonePath);
+      if (!tombstoneProto.getCommandLineList().stream().anyMatch(x -> x.contains(mUUID))) {
+        continue;
+      }
+      if (!tombstoneProto.getCommandLineList().stream().anyMatch(x -> x.contains("testCrash"))) {
+        continue;
+      }
+      numberTombstones++;
+    }
+    assertThat(numberTombstones).isEqualTo(1);
+  }
+  @Test
+  public void testCrashProperty() throws Exception {
+    String prevValue = getDevice().getProperty("persist.sys.mte.permissive");
+    if (prevValue == null) {
+      prevValue = "";
+    }
+    assertThat(getDevice().setProperty("persist.sys.mte.permissive", "1")).isTrue();
+    CommandResult result =
+        getDevice().executeShellV2Command("/data/local/tmp/mte_crash testCrash " + mUUID);
+    assertThat(result.getExitCode()).isEqualTo(0);
+    int numberTombstones = 0;
+    String[] tombstones = getDevice().getChildren("/data/tombstones");
+    for (String tombstone : tombstones) {
+      if (!tombstone.endsWith(".pb")) {
+        continue;
+      }
+      String tombstonePath = "/data/tombstones/" + tombstone;
+      Tombstone tombstoneProto = parseTombstone(tombstonePath);
+      if (!tombstoneProto.getCommandLineList().stream().anyMatch(x -> x.contains(mUUID))) {
+        continue;
+      }
+      if (!tombstoneProto.getCommandLineList().stream().anyMatch(x -> x.contains("testCrash"))) {
+        continue;
+      }
+      numberTombstones++;
+    }
+    assertThat(numberTombstones).isEqualTo(1);
+    assertThat(getDevice().setProperty("persist.sys.mte.permissive", prevValue)).isTrue();
+  }
+}
diff --git a/debuggerd/tombstoned/tombstoned.microdroid.rc b/debuggerd/tombstoned/tombstoned.microdroid.rc
new file mode 100644
index 0000000..7f5c542
--- /dev/null
+++ b/debuggerd/tombstoned/tombstoned.microdroid.rc
@@ -0,0 +1,7 @@
+service tombstoned /system/bin/tombstoned.microdroid
+    user tombstoned
+    group system
+
+    socket tombstoned_crash seqpacket 0666 system system
+    socket tombstoned_intercept seqpacket 0666 system system
+    socket tombstoned_java_trace seqpacket 0666 system system
diff --git a/debuggerd/util.cpp b/debuggerd/util.cpp
index 5c6abc9..df033df 100644
--- a/debuggerd/util.cpp
+++ b/debuggerd/util.cpp
@@ -90,9 +90,7 @@
     if (tid == 0) {
       continue;
     }
-    if (pid != tid) {
-      callback(tid);
-    }
+    callback(tid);
   }
   return true;
 }
diff --git a/fastboot/Android.bp b/fastboot/Android.bp
index 9ae2c37..765174b 100644
--- a/fastboot/Android.bp
+++ b/fastboot/Android.bp
@@ -130,12 +130,10 @@
         "-Werror",
         "-Wvla",
         "-DANDROID_BASE_UNIQUE_FD_DISABLE_IMPLICIT_CONVERSION",
+        "-Wthread-safety",
     ],
     rtti: true,
 
-    clang_cflags: [
-        "-Wthread-safety",
-    ],
 }
 
 cc_binary {
@@ -156,6 +154,7 @@
         "device/flashing.cpp",
         "device/main.cpp",
         "device/usb.cpp",
+        "device/usb_iouring.cpp",
         "device/usb_client.cpp",
         "device/tcp_client.cpp",
         "device/utility.cpp",
@@ -166,7 +165,10 @@
     shared_libs: [
         "android.hardware.boot@1.0",
         "android.hardware.boot@1.1",
+        "android.hardware.boot-V1-ndk",
+        "libboot_control_client",
         "android.hardware.fastboot@1.1",
+        "android.hardware.fastboot-V1-ndk",
         "android.hardware.health@2.0",
         "android.hardware.health-V1-ndk",
         "libasyncio",
@@ -191,10 +193,14 @@
         "libc++fs",
         "libhealthhalutils",
         "libhealthshim",
+        "libfastbootshim",
         "libsnapshot_cow",
+        "liblz4",
         "libsnapshot_nobinder",
         "update_metadata-protos",
+        "liburing",
     ],
+    include_dirs: ["bionic/libc/kernel"],
 
     header_libs: [
         "avb_headers",
@@ -215,7 +221,7 @@
         "-Werror",
         "-Wunreachable-code",
         "-DANDROID_BASE_UNIQUE_FD_DISABLE_IMPLICIT_CONVERSION",
-        "-D_FILE_OFFSET_BITS=64"
+        "-D_FILE_OFFSET_BITS=64",
     ],
 
     target: {
@@ -256,6 +262,7 @@
         "libsparse",
         "libutils",
         "liblog",
+        "liblz4",
         "libz",
         "libdiagnose_usb",
         "libbase",
@@ -337,6 +344,8 @@
         targets: [
             "dist_files",
             "sdk",
+            "sdk-repo-platform-tools",
+            "sdk_repo",
             "win_sdk",
         ],
     },
@@ -344,9 +353,7 @@
     target: {
         not_windows: {
             required: [
-                "e2fsdroid",
                 "mke2fs.conf",
-                "sload_f2fs",
             ],
         },
         windows: {
@@ -411,7 +418,7 @@
         ":fastboot_test_vendor_ramdisk_replace",
         ":fastboot_test_vendor_boot_v3",
         ":fastboot_test_vendor_boot_v4_without_frag",
-        ":fastboot_test_vendor_boot_v4_with_frag"
+        ":fastboot_test_vendor_boot_v4_with_frag",
     ],
 }
 
diff --git a/fastboot/Android.mk b/fastboot/Android.mk
index 10bed6d..cde0cb2 100644
--- a/fastboot/Android.mk
+++ b/fastboot/Android.mk
@@ -19,9 +19,7 @@
 #
 
 my_dist_files := $(HOST_OUT_EXECUTABLES)/mke2fs
-my_dist_files += $(HOST_OUT_EXECUTABLES)/e2fsdroid
 my_dist_files += $(HOST_OUT_EXECUTABLES)/make_f2fs
 my_dist_files += $(HOST_OUT_EXECUTABLES)/make_f2fs_casefold
-my_dist_files += $(HOST_OUT_EXECUTABLES)/sload_f2fs
 $(call dist-for-goals,dist_files sdk,$(my_dist_files))
 my_dist_files :=
diff --git a/fastboot/OWNERS b/fastboot/OWNERS
index 17b3466..3dec07e 100644
--- a/fastboot/OWNERS
+++ b/fastboot/OWNERS
@@ -1,3 +1,5 @@
 dvander@google.com
 elsk@google.com
 enh@google.com
+zhangkelvin@google.com
+
diff --git a/fastboot/constants.h b/fastboot/constants.h
index 4ea68da..ad169d1 100644
--- a/fastboot/constants.h
+++ b/fastboot/constants.h
@@ -42,7 +42,7 @@
 #define RESPONSE_DATA "DATA"
 #define RESPONSE_INFO "INFO"
 
-#define FB_COMMAND_SZ 64
+#define FB_COMMAND_SZ 4096
 #define FB_RESPONSE_SZ 256
 
 #define FB_VAR_VERSION "version"
@@ -64,6 +64,7 @@
 #define FB_VAR_SLOT_UNBOOTABLE "slot-unbootable"
 #define FB_VAR_IS_LOGICAL "is-logical"
 #define FB_VAR_IS_USERSPACE "is-userspace"
+#define FB_VAR_IS_FORCE_DEBUGGABLE "is-force-debuggable"
 #define FB_VAR_HW_REVISION "hw-revision"
 #define FB_VAR_VARIANT "variant"
 #define FB_VAR_OFF_MODE_CHARGE_STATE "off-mode-charge"
@@ -79,3 +80,4 @@
 #define FB_VAR_SECURITY_PATCH_LEVEL "security-patch-level"
 #define FB_VAR_TREBLE_ENABLED "treble-enabled"
 #define FB_VAR_MAX_FETCH_SIZE "max-fetch-size"
+#define FB_VAR_DMESG "dmesg"
diff --git a/fastboot/device/commands.cpp b/fastboot/device/commands.cpp
index b9f6c97..e929f42 100644
--- a/fastboot/device/commands.cpp
+++ b/fastboot/device/commands.cpp
@@ -40,6 +40,9 @@
 #include <storage_literals/storage_literals.h>
 #include <uuid/uuid.h>
 
+#include <bootloader_message/bootloader_message.h>
+
+#include "BootControlClient.h"
 #include "constants.h"
 #include "fastboot_device.h"
 #include "flashing.h"
@@ -52,15 +55,10 @@
 #endif
 
 using android::fs_mgr::MetadataBuilder;
+using android::hal::CommandResult;
 using ::android::hardware::hidl_string;
-using ::android::hardware::boot::V1_0::BoolResult;
-using ::android::hardware::boot::V1_0::CommandResult;
-using ::android::hardware::boot::V1_0::Slot;
-using ::android::hardware::boot::V1_1::MergeStatus;
-using ::android::hardware::fastboot::V1_0::Result;
-using ::android::hardware::fastboot::V1_0::Status;
 using android::snapshot::SnapshotManager;
-using IBootControl1_1 = ::android::hardware::boot::V1_1::IBootControl;
+using MergeStatus = android::hal::BootControlClient::MergeStatus;
 
 using namespace android::storage_literals;
 
@@ -112,52 +110,74 @@
     }
 }
 
-bool GetVarHandler(FastbootDevice* device, const std::vector<std::string>& args) {
-    const std::unordered_map<std::string, VariableHandlers> kVariableMap = {
-            {FB_VAR_VERSION, {GetVersion, nullptr}},
-            {FB_VAR_VERSION_BOOTLOADER, {GetBootloaderVersion, nullptr}},
-            {FB_VAR_VERSION_BASEBAND, {GetBasebandVersion, nullptr}},
-            {FB_VAR_VERSION_OS, {GetOsVersion, nullptr}},
-            {FB_VAR_VERSION_VNDK, {GetVndkVersion, nullptr}},
-            {FB_VAR_PRODUCT, {GetProduct, nullptr}},
-            {FB_VAR_SERIALNO, {GetSerial, nullptr}},
-            {FB_VAR_VARIANT, {GetVariant, nullptr}},
-            {FB_VAR_SECURE, {GetSecure, nullptr}},
-            {FB_VAR_UNLOCKED, {GetUnlocked, nullptr}},
-            {FB_VAR_MAX_DOWNLOAD_SIZE, {GetMaxDownloadSize, nullptr}},
-            {FB_VAR_CURRENT_SLOT, {::GetCurrentSlot, nullptr}},
-            {FB_VAR_SLOT_COUNT, {GetSlotCount, nullptr}},
-            {FB_VAR_HAS_SLOT, {GetHasSlot, GetAllPartitionArgsNoSlot}},
-            {FB_VAR_SLOT_SUCCESSFUL, {GetSlotSuccessful, nullptr}},
-            {FB_VAR_SLOT_UNBOOTABLE, {GetSlotUnbootable, nullptr}},
-            {FB_VAR_PARTITION_SIZE, {GetPartitionSize, GetAllPartitionArgsWithSlot}},
-            {FB_VAR_PARTITION_TYPE, {GetPartitionType, GetAllPartitionArgsWithSlot}},
-            {FB_VAR_IS_LOGICAL, {GetPartitionIsLogical, GetAllPartitionArgsWithSlot}},
-            {FB_VAR_IS_USERSPACE, {GetIsUserspace, nullptr}},
-            {FB_VAR_OFF_MODE_CHARGE_STATE, {GetOffModeChargeState, nullptr}},
-            {FB_VAR_BATTERY_VOLTAGE, {GetBatteryVoltage, nullptr}},
-            {FB_VAR_BATTERY_SOC_OK, {GetBatterySoCOk, nullptr}},
-            {FB_VAR_HW_REVISION, {GetHardwareRevision, nullptr}},
-            {FB_VAR_SUPER_PARTITION_NAME, {GetSuperPartitionName, nullptr}},
-            {FB_VAR_SNAPSHOT_UPDATE_STATUS, {GetSnapshotUpdateStatus, nullptr}},
-            {FB_VAR_CPU_ABI, {GetCpuAbi, nullptr}},
-            {FB_VAR_SYSTEM_FINGERPRINT, {GetSystemFingerprint, nullptr}},
-            {FB_VAR_VENDOR_FINGERPRINT, {GetVendorFingerprint, nullptr}},
-            {FB_VAR_DYNAMIC_PARTITION, {GetDynamicPartition, nullptr}},
-            {FB_VAR_FIRST_API_LEVEL, {GetFirstApiLevel, nullptr}},
-            {FB_VAR_SECURITY_PATCH_LEVEL, {GetSecurityPatchLevel, nullptr}},
-            {FB_VAR_TREBLE_ENABLED, {GetTrebleEnabled, nullptr}},
-            {FB_VAR_MAX_FETCH_SIZE, {GetMaxFetchSize, nullptr}},
-    };
+const std::unordered_map<std::string, VariableHandlers> kVariableMap = {
+        {FB_VAR_VERSION, {GetVersion, nullptr}},
+        {FB_VAR_VERSION_BOOTLOADER, {GetBootloaderVersion, nullptr}},
+        {FB_VAR_VERSION_BASEBAND, {GetBasebandVersion, nullptr}},
+        {FB_VAR_VERSION_OS, {GetOsVersion, nullptr}},
+        {FB_VAR_VERSION_VNDK, {GetVndkVersion, nullptr}},
+        {FB_VAR_PRODUCT, {GetProduct, nullptr}},
+        {FB_VAR_SERIALNO, {GetSerial, nullptr}},
+        {FB_VAR_VARIANT, {GetVariant, nullptr}},
+        {FB_VAR_SECURE, {GetSecure, nullptr}},
+        {FB_VAR_UNLOCKED, {GetUnlocked, nullptr}},
+        {FB_VAR_MAX_DOWNLOAD_SIZE, {GetMaxDownloadSize, nullptr}},
+        {FB_VAR_CURRENT_SLOT, {::GetCurrentSlot, nullptr}},
+        {FB_VAR_SLOT_COUNT, {GetSlotCount, nullptr}},
+        {FB_VAR_HAS_SLOT, {GetHasSlot, GetAllPartitionArgsNoSlot}},
+        {FB_VAR_SLOT_SUCCESSFUL, {GetSlotSuccessful, nullptr}},
+        {FB_VAR_SLOT_UNBOOTABLE, {GetSlotUnbootable, nullptr}},
+        {FB_VAR_PARTITION_SIZE, {GetPartitionSize, GetAllPartitionArgsWithSlot}},
+        {FB_VAR_PARTITION_TYPE, {GetPartitionType, GetAllPartitionArgsWithSlot}},
+        {FB_VAR_IS_LOGICAL, {GetPartitionIsLogical, GetAllPartitionArgsWithSlot}},
+        {FB_VAR_IS_USERSPACE, {GetIsUserspace, nullptr}},
+        {FB_VAR_IS_FORCE_DEBUGGABLE, {GetIsForceDebuggable, nullptr}},
+        {FB_VAR_OFF_MODE_CHARGE_STATE, {GetOffModeChargeState, nullptr}},
+        {FB_VAR_BATTERY_VOLTAGE, {GetBatteryVoltage, nullptr}},
+        {FB_VAR_BATTERY_SOC_OK, {GetBatterySoCOk, nullptr}},
+        {FB_VAR_HW_REVISION, {GetHardwareRevision, nullptr}},
+        {FB_VAR_SUPER_PARTITION_NAME, {GetSuperPartitionName, nullptr}},
+        {FB_VAR_SNAPSHOT_UPDATE_STATUS, {GetSnapshotUpdateStatus, nullptr}},
+        {FB_VAR_CPU_ABI, {GetCpuAbi, nullptr}},
+        {FB_VAR_SYSTEM_FINGERPRINT, {GetSystemFingerprint, nullptr}},
+        {FB_VAR_VENDOR_FINGERPRINT, {GetVendorFingerprint, nullptr}},
+        {FB_VAR_DYNAMIC_PARTITION, {GetDynamicPartition, nullptr}},
+        {FB_VAR_FIRST_API_LEVEL, {GetFirstApiLevel, nullptr}},
+        {FB_VAR_SECURITY_PATCH_LEVEL, {GetSecurityPatchLevel, nullptr}},
+        {FB_VAR_TREBLE_ENABLED, {GetTrebleEnabled, nullptr}},
+        {FB_VAR_MAX_FETCH_SIZE, {GetMaxFetchSize, nullptr}},
+};
 
+static bool GetVarAll(FastbootDevice* device) {
+    for (const auto& [name, handlers] : kVariableMap) {
+        GetAllVars(device, name, handlers);
+    }
+    return true;
+}
+
+static void PostWipeData() {
+    std::string err;
+    // Reset mte state of device.
+    if (!WriteMiscMemtagMessage({}, &err)) {
+        LOG(ERROR) << "Failed to reset MTE state: " << err;
+    }
+}
+
+const std::unordered_map<std::string, std::function<bool(FastbootDevice*)>> kSpecialVars = {
+        {"all", GetVarAll},
+        {"dmesg", GetDmesg},
+};
+
+bool GetVarHandler(FastbootDevice* device, const std::vector<std::string>& args) {
     if (args.size() < 2) {
         return device->WriteFail("Missing argument");
     }
 
-    // Special case: return all variables that we can.
-    if (args[1] == "all") {
-        for (const auto& [name, handlers] : kVariableMap) {
-            GetAllVars(device, name, handlers);
+    // "all" and "dmesg" are multiline and handled specially.
+    auto found_special = kSpecialVars.find(args[1]);
+    if (found_special != kSpecialVars.end()) {
+        if (!found_special->second(device)) {
+            return false;
         }
         return device->WriteOkay("");
     }
@@ -182,20 +202,21 @@
         return false;
     }
 
-    Result ret;
-    auto ret_val = fastboot_hal->doOemSpecificErase([&](Result result) { ret = result; });
-    if (!ret_val.isOk()) {
-        return false;
-    }
-    if (ret.status == Status::NOT_SUPPORTED) {
-        return false;
-    } else if (ret.status != Status::SUCCESS) {
-        device->WriteStatus(FastbootResult::FAIL, ret.message);
-    } else {
+    auto status = fastboot_hal->doOemSpecificErase();
+    if (status.isOk()) {
         device->WriteStatus(FastbootResult::OKAY, "Erasing succeeded");
+        return true;
     }
-
-    return true;
+    switch (status.getExceptionCode()) {
+        case EX_UNSUPPORTED_OPERATION:
+            return false;
+        case EX_SERVICE_SPECIFIC:
+            device->WriteStatus(FastbootResult::FAIL, status.getDescription());
+            return false;
+        default:
+            LOG(ERROR) << "Erase operation failed" << status.getDescription();
+            return false;
+    }
 }
 
 bool EraseHandler(FastbootDevice* device, const std::vector<std::string>& args) {
@@ -221,6 +242,7 @@
         //Perform oem PostWipeData if Android userdata partition has been erased
         bool support_oem_postwipedata = false;
         if (partition_name == "userdata") {
+            PostWipeData();
             support_oem_postwipedata = OemPostWipeData(device);
         }
 
@@ -244,17 +266,16 @@
     if (args[0] == "oem postwipedata userdata") {
         return device->WriteStatus(FastbootResult::FAIL, "Unable to do oem postwipedata userdata");
     }
-
-    Result ret;
-    auto ret_val = fastboot_hal->doOemCommand(args[0], [&](Result result) { ret = result; });
-    if (!ret_val.isOk()) {
-        return device->WriteStatus(FastbootResult::FAIL, "Unable to do OEM command");
-    }
-    if (ret.status != Status::SUCCESS) {
-        return device->WriteStatus(FastbootResult::FAIL, ret.message);
+    std::string message;
+    auto status = fastboot_hal->doOemCommand(args[0], &message);
+    if (!status.isOk()) {
+        LOG(ERROR) << "Unable to do OEM command " << args[0].c_str() << status.getDescription();
+        return device->WriteStatus(FastbootResult::FAIL,
+                                   "Unable to do OEM command " + status.getDescription());
     }
 
-    return device->WriteStatus(FastbootResult::OKAY, ret.message);
+    device->WriteInfo(message);
+    return device->WriteStatus(FastbootResult::OKAY, message);
 }
 
 bool DownloadHandler(FastbootDevice* device, const std::vector<std::string>& args) {
@@ -303,7 +324,7 @@
                                    "set_active command is not allowed on locked devices");
     }
 
-    Slot slot;
+    int32_t slot = 0;
     if (!GetSlotNumber(args[1], &slot)) {
         // Slot suffix needs to be between 'a' and 'z'.
         return device->WriteStatus(FastbootResult::FAIL, "Bad slot suffix");
@@ -315,7 +336,7 @@
         return device->WriteStatus(FastbootResult::FAIL,
                                    "Cannot set slot: boot control HAL absent");
     }
-    if (slot >= boot_control_hal->getNumberSlots()) {
+    if (slot >= boot_control_hal->GetNumSlots()) {
         return device->WriteStatus(FastbootResult::FAIL, "Slot out of range");
     }
 
@@ -344,10 +365,8 @@
         }
     }
 
-    CommandResult ret;
-    auto cb = [&ret](CommandResult result) { ret = result; };
-    auto result = boot_control_hal->setActiveBootSlot(slot, cb);
-    if (result.isOk() && ret.success) {
+    CommandResult ret = boot_control_hal->SetActiveBootSlot(slot);
+    if (ret.success) {
         // Save as slot suffix to match the suffix format as returned from
         // the boot control HAL.
         auto current_slot = "_" + args[1];
@@ -600,6 +619,10 @@
     if (ret < 0) {
         return device->WriteStatus(FastbootResult::FAIL, strerror(-ret));
     }
+    if (partition_name == "userdata") {
+        PostWipeData();
+    }
+
     return device->WriteStatus(FastbootResult::OKAY, "Flashing succeeded");
 }
 
@@ -668,9 +691,14 @@
     if (args[1] == "cancel") {
         switch (status) {
             case MergeStatus::SNAPSHOTTED:
-            case MergeStatus::MERGING:
-                hal->setSnapshotMergeStatus(MergeStatus::CANCELLED);
+            case MergeStatus::MERGING: {
+                const auto ret = hal->SetSnapshotMergeStatus(MergeStatus::CANCELLED);
+                if (!ret.success) {
+                    device->WriteFail("Failed to SetSnapshotMergeStatus(MergeStatus::CANCELLED) " +
+                                      ret.errMsg);
+                }
                 break;
+            }
             default:
                 break;
         }
diff --git a/fastboot/device/fastboot_device.cpp b/fastboot/device/fastboot_device.cpp
index ae225de..5afeb4f 100644
--- a/fastboot/device/fastboot_device.cpp
+++ b/fastboot/device/fastboot_device.cpp
@@ -18,12 +18,14 @@
 
 #include <algorithm>
 
+#include <BootControlClient.h>
 #include <android-base/logging.h>
 #include <android-base/properties.h>
 #include <android-base/strings.h>
 #include <android/binder_manager.h>
 #include <android/hardware/boot/1.0/IBootControl.h>
 #include <android/hardware/fastboot/1.1/IFastboot.h>
+#include <fastbootshim.h>
 #include <fs_mgr.h>
 #include <fs_mgr/roots.h>
 #include <health-shim/shim.h>
@@ -38,9 +40,8 @@
 using android::fs_mgr::EnsurePathUnmounted;
 using android::fs_mgr::Fstab;
 using ::android::hardware::hidl_string;
-using ::android::hardware::boot::V1_0::IBootControl;
-using ::android::hardware::boot::V1_0::Slot;
 using ::android::hardware::fastboot::V1_1::IFastboot;
+using BootControlClient = FastbootDevice::BootControlClient;
 
 namespace sph = std::placeholders;
 
@@ -64,6 +65,27 @@
     return nullptr;
 }
 
+std::shared_ptr<aidl::android::hardware::fastboot::IFastboot> get_fastboot_service() {
+    using aidl::android::hardware::fastboot::IFastboot;
+    using HidlFastboot = android::hardware::fastboot::V1_1::IFastboot;
+    using aidl::android::hardware::fastboot::FastbootShim;
+    auto service_name = IFastboot::descriptor + "/default"s;
+    ndk::SpAIBinder binder(AServiceManager_getService(service_name.c_str()));
+    std::shared_ptr<IFastboot> fastboot = IFastboot::fromBinder(binder);
+    if (fastboot != nullptr) {
+        LOG(INFO) << "Using AIDL fastboot service";
+        return fastboot;
+    }
+    LOG(INFO) << "Unable to get AIDL fastboot service, trying HIDL...";
+    android::sp<HidlFastboot> hidl_fastboot = HidlFastboot::getService();
+    if (hidl_fastboot != nullptr) {
+        LOG(INFO) << "Found and now using fastboot HIDL implementation";
+        return ndk::SharedRefBase::make<FastbootShim>(hidl_fastboot);
+    }
+    LOG(WARNING) << "No fastboot implementation is found.";
+    return nullptr;
+}
+
 FastbootDevice::FastbootDevice()
     : kCommandMap({
               {FB_CMD_SET_ACTIVE, SetActiveHandler},
@@ -85,9 +107,9 @@
               {FB_CMD_SNAPSHOT_UPDATE, SnapshotUpdateHandler},
               {FB_CMD_FETCH, FetchHandler},
       }),
-      boot_control_hal_(IBootControl::getService()),
+      boot_control_hal_(BootControlClient::WaitForService()),
       health_hal_(get_health_service()),
-      fastboot_hal_(IFastboot::getService()),
+      fastboot_hal_(get_fastboot_service()),
       active_slot_("") {
     if (android::base::GetProperty("fastbootd.protocol", "usb") == "tcp") {
         transport_ = std::make_unique<ClientTcpTransport>();
@@ -95,10 +117,6 @@
         transport_ = std::make_unique<ClientUsbTransport>();
     }
 
-    if (boot_control_hal_) {
-        boot1_1_ = android::hardware::boot::V1_1::IBootControl::castFrom(boot_control_hal_);
-    }
-
     // Make sure cache is unmounted, since recovery will have mounted it for
     // logging.
     Fstab fstab;
@@ -125,12 +143,17 @@
     if (!boot_control_hal_) {
         return "";
     }
-    std::string suffix;
-    auto cb = [&suffix](hidl_string s) { suffix = s; };
-    boot_control_hal_->getSuffix(boot_control_hal_->getCurrentSlot(), cb);
+    std::string suffix = boot_control_hal_->GetSuffix(boot_control_hal_->GetCurrentSlot());
     return suffix;
 }
 
+BootControlClient* FastbootDevice::boot1_1() const {
+    if (boot_control_hal_->GetVersion() >= android::hal::BootControlVersion::BOOTCTL_V1_1) {
+        return boot_control_hal_.get();
+    }
+    return nullptr;
+}
+
 bool FastbootDevice::WriteStatus(FastbootResult result, const std::string& message) {
     constexpr size_t kResponseReasonSize = 4;
     constexpr size_t kNumResponseTypes = 4;  // "FAIL", "OKAY", "INFO", "DATA"
diff --git a/fastboot/device/fastboot_device.h b/fastboot/device/fastboot_device.h
index 91ffce3..fcaf249 100644
--- a/fastboot/device/fastboot_device.h
+++ b/fastboot/device/fastboot_device.h
@@ -22,10 +22,9 @@
 #include <utility>
 #include <vector>
 
+#include <BootControlClient.h>
+#include <aidl/android/hardware/fastboot/IFastboot.h>
 #include <aidl/android/hardware/health/IHealth.h>
-#include <android/hardware/boot/1.0/IBootControl.h>
-#include <android/hardware/boot/1.1/IBootControl.h>
-#include <android/hardware/fastboot/1.1/IFastboot.h>
 
 #include "commands.h"
 #include "transport.h"
@@ -33,6 +32,7 @@
 
 class FastbootDevice {
   public:
+    using BootControlClient = android::hal::BootControlClient;
     FastbootDevice();
     ~FastbootDevice();
 
@@ -50,11 +50,9 @@
 
     std::vector<char>& download_data() { return download_data_; }
     Transport* get_transport() { return transport_.get(); }
-    android::sp<android::hardware::boot::V1_0::IBootControl> boot_control_hal() {
-        return boot_control_hal_;
-    }
-    android::sp<android::hardware::boot::V1_1::IBootControl> boot1_1() { return boot1_1_; }
-    android::sp<android::hardware::fastboot::V1_1::IFastboot> fastboot_hal() {
+    BootControlClient* boot_control_hal() const { return boot_control_hal_.get(); }
+    BootControlClient* boot1_1() const;
+    std::shared_ptr<aidl::android::hardware::fastboot::IFastboot> fastboot_hal() {
         return fastboot_hal_;
     }
     std::shared_ptr<aidl::android::hardware::health::IHealth> health_hal() { return health_hal_; }
@@ -65,10 +63,9 @@
     const std::unordered_map<std::string, CommandHandler> kCommandMap;
 
     std::unique_ptr<Transport> transport_;
-    android::sp<android::hardware::boot::V1_0::IBootControl> boot_control_hal_;
-    android::sp<android::hardware::boot::V1_1::IBootControl> boot1_1_;
+    std::unique_ptr<BootControlClient> boot_control_hal_;
     std::shared_ptr<aidl::android::hardware::health::IHealth> health_hal_;
-    android::sp<android::hardware::fastboot::V1_1::IFastboot> fastboot_hal_;
+    std::shared_ptr<aidl::android::hardware::fastboot::IFastboot> fastboot_hal_;
     std::vector<char> download_data_;
     std::string active_slot_;
 };
diff --git a/fastboot/device/flashing.cpp b/fastboot/device/flashing.cpp
index 06ffe0f..05186a2 100644
--- a/fastboot/device/flashing.cpp
+++ b/fastboot/device/flashing.cpp
@@ -121,7 +121,12 @@
 int WriteCallback(void* priv, const void* data, size_t len) {
     PartitionHandle* handle = reinterpret_cast<PartitionHandle*>(priv);
     if (!data) {
-        return lseek64(handle->fd(), len, SEEK_CUR) >= 0 ? 0 : -errno;
+        if (lseek64(handle->fd(), len, SEEK_CUR) < 0) {
+            int rv = -errno;
+            PLOG(ERROR) << "lseek failed";
+            return rv;
+        }
+        return 0;
     }
     return FlashRawDataChunk(handle, reinterpret_cast<const char*>(data), len);
 }
@@ -131,6 +136,7 @@
                                                       downloaded_data.size(), true, false);
     if (!file) {
         // Invalid sparse format
+        LOG(ERROR) << "Unable to open sparse data for flashing";
         return -EINVAL;
     }
     return sparse_file_callback(file, false, false, WriteCallback, reinterpret_cast<void*>(handle));
@@ -175,10 +181,13 @@
 
     std::vector<char> data = std::move(device->download_data());
     if (data.size() == 0) {
+        LOG(ERROR) << "Cannot flash empty data vector";
         return -EINVAL;
     }
     uint64_t block_device_size = get_block_device_size(handle.fd());
     if (data.size() > block_device_size) {
+        LOG(ERROR) << "Cannot flash " << data.size() << " bytes to block device of size "
+                   << block_device_size;
         return -EOVERFLOW;
     } else if (data.size() < block_device_size &&
                (partition_name == "boot" || partition_name == "boot_a" ||
diff --git a/fastboot/device/main.cpp b/fastboot/device/main.cpp
index df9c900..08c9358 100644
--- a/fastboot/device/main.cpp
+++ b/fastboot/device/main.cpp
@@ -14,13 +14,30 @@
  * limitations under the License.
  */
 
+#include <stdarg.h>
+
 #include <android-base/logging.h>
+#include <android-base/stringprintf.h>
+#include <sparse/sparse.h>
 
 #include "fastboot_device.h"
 
+static void LogSparseVerboseMessage(const char* fmt, ...) {
+    std::string message;
+
+    va_list ap;
+    va_start(ap, fmt);
+    android::base::StringAppendV(&message, fmt, ap);
+    va_end(ap);
+
+    LOG(ERROR) << "libsparse message: " << message;
+}
+
 int main(int /*argc*/, char* argv[]) {
     android::base::InitLogging(argv, &android::base::KernelLogger);
 
+    sparse_print_verbose = LogSparseVerboseMessage;
+
     while (true) {
         FastbootDevice device;
         device.ExecuteCommands();
diff --git a/fastboot/device/usb.cpp b/fastboot/device/usb.cpp
index 4115a6d..75a687f 100644
--- a/fastboot/device/usb.cpp
+++ b/fastboot/device/usb.cpp
@@ -15,6 +15,7 @@
  */
 
 #include "usb.h"
+#include "usb_iouring.h"
 
 #include <dirent.h>
 #include <errno.h>
@@ -28,6 +29,7 @@
 
 #include <linux/usb/ch9.h>
 #include <linux/usb/functionfs.h>
+#include <sys/utsname.h>
 
 #include <algorithm>
 #include <atomic>
@@ -38,6 +40,7 @@
 
 #include <android-base/logging.h>
 #include <android-base/properties.h>
+#include <liburing.h>
 
 using namespace std::chrono_literals;
 
@@ -65,8 +68,8 @@
     }
 }
 
-static int getMaxPacketSize(int ffs_fd) {
-    usb_endpoint_descriptor desc;
+int getMaxPacketSize(int ffs_fd) {
+    usb_endpoint_descriptor desc{};
     if (ioctl(ffs_fd, FUNCTIONFS_ENDPOINT_DESC, reinterpret_cast<unsigned long>(&desc))) {
         D("[ could not get endpoint descriptor! (%d) ]", errno);
         return MAX_PACKET_SIZE_HS;
@@ -128,11 +131,9 @@
 
 static int usb_ffs_do_aio(usb_handle* h, const void* data, int len, bool read) {
     aio_block* aiob = read ? &h->read_aiob : &h->write_aiob;
-    bool zero_packet = false;
 
     int num_bufs = len / h->io_size + (len % h->io_size == 0 ? 0 : 1);
     const char* cur_data = reinterpret_cast<const char*>(data);
-    int packet_size = getMaxPacketSize(aiob->fd);
 
     if (posix_madvise(const_cast<void*>(data), len, POSIX_MADV_SEQUENTIAL | POSIX_MADV_WILLNEED) <
         0) {
@@ -145,17 +146,6 @@
 
         len -= buf_len;
         cur_data += buf_len;
-
-        if (len == 0 && buf_len % packet_size == 0 && read) {
-            // adb does not expect the device to send a zero packet after data transfer,
-            // but the host *does* send a zero packet for the device to read.
-            zero_packet = h->reads_zero_packets;
-        }
-    }
-    if (zero_packet) {
-        io_prep(&aiob->iocb[num_bufs], aiob->fd, reinterpret_cast<const void*>(cur_data),
-                packet_size, 0, read);
-        num_bufs += 1;
     }
 
     while (true) {
@@ -171,6 +161,16 @@
         if (num_bufs == 1 && aiob->events[0].res == -EINTR) {
             continue;
         }
+        if (read && aiob->events[0].res == -EPIPE) {
+            // On initial connection, some clients will send a ClearFeature(HALT) to
+            // attempt to resynchronize host and device after the fastboot server is killed.
+            // On newer device kernels, the reads we've already dispatched will be cancelled.
+            // Instead of treating this as a failure, which will tear down the interface and
+            // lead to the client doing the same thing again, just resubmit if this happens
+            // before we've actually read anything.
+            PLOG(ERROR) << "aio: got -EPIPE on first read attempt. Re-submitting read... ";
+            continue;
+        }
         int ret = 0;
         for (int i = 0; i < num_bufs; i++) {
             if (aiob->events[i].res < 0) {
@@ -204,21 +204,46 @@
     h->open_new_connection = true;
     h->lock.unlock();
     h->notify.notify_one();
+    if (h->aio_type == AIOType::IO_URING) {
+        exit_io_uring_ffs(h);
+    }
 }
 
-usb_handle* create_usb_handle(unsigned num_bufs, unsigned io_size) {
-    usb_handle* h = new usb_handle();
+bool DoesKernelSupportIouring() {
+    struct utsname uts {};
+    unsigned int major = 0, minor = 0;
+    if ((uname(&uts) != 0) || (sscanf(uts.release, "%u.%u", &major, &minor) != 2)) {
+        return false;
+    }
+    if (major > 5) {
+        return true;
+    }
+    // We will only support kernels from 5.6 onwards as IOSQE_ASYNC flag and
+    // IO_URING_OP_READ/WRITE opcodes were introduced only on 5.6 kernel
+    return minor >= 6;
+}
 
-    if (android::base::GetBoolProperty("sys.usb.ffs.aio_compat", false)) {
+std::unique_ptr<usb_handle> create_usb_handle(unsigned num_bufs, unsigned io_size) {
+    auto h = std::make_unique<usb_handle>();
+    if (DoesKernelSupportIouring() &&
+        android::base::GetBoolProperty("sys.usb.ffs.io_uring_enabled", false)) {
+        init_io_uring_ffs(h.get(), num_bufs);
+        h->aio_type = AIOType::IO_URING;
+        LOG(INFO) << "Using io_uring for usb ffs";
+    } else if (android::base::GetBoolProperty("sys.usb.ffs.aio_compat", false)) {
         // Devices on older kernels (< 3.18) will not have aio support for ffs
         // unless backported. Fall back on the non-aio functions instead.
         h->write = usb_ffs_write;
         h->read = usb_ffs_read;
+        h->aio_type = AIOType::SYNC_IO;
+        LOG(INFO) << "Using sync io for usb ffs";
     } else {
         h->write = usb_ffs_aio_write;
         h->read = usb_ffs_aio_read;
         aio_block_init(&h->read_aiob, num_bufs);
         aio_block_init(&h->write_aiob, num_bufs);
+        h->aio_type = AIOType::AIO;
+        LOG(INFO) << "Using aio for usb ffs";
     }
     h->io_size = io_size;
     h->close = usb_ffs_close;
diff --git a/fastboot/device/usb.h b/fastboot/device/usb.h
index 6c3f542..8996c31 100644
--- a/fastboot/device/usb.h
+++ b/fastboot/device/usb.h
@@ -18,8 +18,10 @@
 
 #include <linux/usb/functionfs.h>
 
+#include <liburing.h>
 #include <atomic>
 #include <condition_variable>
+#include <memory>
 #include <mutex>
 #include <vector>
 
@@ -35,9 +37,11 @@
     int fd;
 };
 
-struct usb_handle {
-    usb_handle() {}
+int getMaxPacketSize(int ffs_fd);
 
+enum class AIOType { SYNC_IO, AIO, IO_URING };
+
+struct usb_handle {
     std::condition_variable notify;
     std::mutex lock;
     bool open_new_connection = true;
@@ -56,8 +60,9 @@
     struct aio_block read_aiob;
     struct aio_block write_aiob;
 
-    bool reads_zero_packets;
+    io_uring ring;
     size_t io_size;
+    AIOType aio_type;
 };
 
-usb_handle* create_usb_handle(unsigned num_bufs, unsigned io_size);
+std::unique_ptr<usb_handle> create_usb_handle(unsigned num_bufs, unsigned io_size);
diff --git a/fastboot/device/usb_client.cpp b/fastboot/device/usb_client.cpp
index 3f9b0f0..d1b38d4 100644
--- a/fastboot/device/usb_client.cpp
+++ b/fastboot/device/usb_client.cpp
@@ -232,7 +232,6 @@
 
     h->read_aiob.fd = h->bulk_out.get();
     h->write_aiob.fd = h->bulk_in.get();
-    h->reads_zero_packets = false;
     return true;
 
 err:
diff --git a/fastboot/device/usb_iouring.cpp b/fastboot/device/usb_iouring.cpp
new file mode 100644
index 0000000..d987712
--- /dev/null
+++ b/fastboot/device/usb_iouring.cpp
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <android-base/logging.h>
+#include <liburing.h>
+#include "liburing/io_uring.h"
+#include "usb.h"
+
+static int prep_async_read(struct io_uring* ring, int fd, void* data, size_t len, int64_t offset) {
+    if (io_uring_sq_space_left(ring) <= 0) {
+        LOG(ERROR) << "Submission queue run out of space.";
+        return -1;
+    }
+    auto sqe = io_uring_get_sqe(ring);
+    if (sqe == nullptr) {
+        return -1;
+    }
+    io_uring_sqe_set_flags(sqe, IOSQE_IO_LINK | IOSQE_ASYNC);
+    io_uring_prep_read(sqe, fd, data, len, offset);
+    return 0;
+}
+
+static int prep_async_write(struct io_uring* ring, int fd, const void* data, size_t len,
+                            int64_t offset) {
+    if (io_uring_sq_space_left(ring) <= 0) {
+        LOG(ERROR) << "Submission queue run out of space.";
+        return -1;
+    }
+    auto sqe = io_uring_get_sqe(ring);
+    if (sqe == nullptr) {
+        return -1;
+    }
+    io_uring_sqe_set_flags(sqe, IOSQE_IO_LINK | IOSQE_ASYNC);
+    io_uring_prep_write(sqe, fd, data, len, offset);
+    return 0;
+}
+
+template <bool read, typename T>
+int prep_async_io(struct io_uring* ring, int fd, T* data, size_t len, int64_t offset) {
+    if constexpr (read) {
+        return prep_async_read(ring, fd, data, len, offset);
+    } else {
+        return prep_async_write(ring, fd, data, len, offset);
+    }
+}
+
+template <typename T>
+static constexpr T DivRoundup(T x, T y) {
+    return (x + y - 1) / y;
+}
+
+extern int getMaxPacketSize(int ffs_fd);
+
+template <bool read, typename T>
+static int usb_ffs_do_aio(usb_handle* h, T* const data, const int len) {
+    const aio_block* aiob = read ? &h->read_aiob : &h->write_aiob;
+    const int num_requests = DivRoundup<int>(len, h->io_size);
+    auto cur_data = data;
+    const auto packet_size = getMaxPacketSize(aiob->fd);
+
+    for (int bytes_remain = len; bytes_remain > 0;) {
+        const int buf_len = std::min(bytes_remain, static_cast<int>(h->io_size));
+        const auto ret = prep_async_io<read>(&h->ring, aiob->fd, cur_data, buf_len, 0);
+        if (ret < 0) {
+            PLOG(ERROR) << "Failed to queue io_uring request";
+            return -1;
+        }
+
+        bytes_remain -= buf_len;
+        cur_data = reinterpret_cast<T*>(reinterpret_cast<size_t>(cur_data) + buf_len);
+    }
+    const int ret = io_uring_submit(&h->ring);
+    if (ret <= 0 || ret != num_requests) {
+        PLOG(ERROR) << "io_uring: failed to submit SQE entries to kernel";
+        return -1;
+    }
+    int res = 0;
+    bool success = true;
+    for (int i = 0; i < num_requests; ++i) {
+        struct io_uring_cqe* cqe{};
+        const auto ret = TEMP_FAILURE_RETRY(io_uring_wait_cqe(&h->ring, &cqe));
+        if (ret < 0 || cqe == nullptr) {
+            PLOG(ERROR) << "Failed to get CQE from kernel";
+            success = false;
+            continue;
+        }
+        res += cqe->res;
+        if (cqe->res < 0) {
+            LOG(ERROR) << "io_uring request failed:, i = " << i
+                       << ", num_requests = " << num_requests << ", res = " << cqe->res << ": "
+                       << strerror(cqe->res) << (read ? " read" : " write")
+                       << " request size: " << len << ", io_size: " << h->io_size
+                       << " max packet size: " << packet_size << ", fd: " << aiob->fd;
+            success = false;
+            errno = -cqe->res;
+        }
+        io_uring_cqe_seen(&h->ring, cqe);
+    }
+    if (!success) {
+        return -1;
+    }
+    return res;
+}
+
+static int usb_ffs_io_uring_read(usb_handle* h, void* data, int len, bool /* allow_partial */) {
+    return usb_ffs_do_aio<true>(h, data, len);
+}
+
+static int usb_ffs_io_uring_write(usb_handle* h, const void* data, int len) {
+    return usb_ffs_do_aio<false>(h, data, len);
+}
+
+void exit_io_uring_ffs(usb_handle* h) {
+    io_uring_queue_exit(&h->ring);
+}
+
+bool init_io_uring_ffs(usb_handle* h, size_t queue_depth) {
+    const auto err = io_uring_queue_init(queue_depth, &h->ring, 0);
+    if (err) {
+        LOG(ERROR) << "Failed to initialize io_uring of depth " << queue_depth << ": "
+                   << strerror(err);
+        return false;
+    }
+    h->write = usb_ffs_io_uring_write;
+    h->read = usb_ffs_io_uring_read;
+    return true;
+}
diff --git a/fastboot/device/usb_iouring.h b/fastboot/device/usb_iouring.h
new file mode 100644
index 0000000..7c14b81
--- /dev/null
+++ b/fastboot/device/usb_iouring.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "usb.h"
+
+bool init_io_uring_ffs(usb_handle* h, size_t queue_depth);
+
+void exit_io_uring_ffs(usb_handle* h);
diff --git a/fastboot/device/utility.cpp b/fastboot/device/utility.cpp
index 3302c43..e12ee64 100644
--- a/fastboot/device/utility.cpp
+++ b/fastboot/device/utility.cpp
@@ -36,7 +36,6 @@
 using namespace android::fs_mgr;
 using namespace std::chrono_literals;
 using android::base::unique_fd;
-using android::hardware::boot::V1_0::Slot;
 
 namespace {
 
@@ -137,7 +136,7 @@
     return true;
 }
 
-bool GetSlotNumber(const std::string& slot, Slot* number) {
+bool GetSlotNumber(const std::string& slot, int32_t* number) {
     if (slot.size() != 1) {
         return false;
     }
@@ -204,7 +203,7 @@
     size_t num_slots = 1;
     auto boot_control_hal = device->boot_control_hal();
     if (boot_control_hal) {
-        num_slots = boot_control_hal->getNumberSlots();
+        num_slots = boot_control_hal->GetNumSlots();
     }
 
     bool ok = true;
diff --git a/fastboot/device/utility.h b/fastboot/device/utility.h
index 6e1453f..a62125e 100644
--- a/fastboot/device/utility.h
+++ b/fastboot/device/utility.h
@@ -21,7 +21,6 @@
 #include <android-base/file.h>
 #include <android-base/logging.h>
 #include <android-base/unique_fd.h>
-#include <android/hardware/boot/1.0/IBootControl.h>
 #include <fstab/fstab.h>
 #include <liblp/liblp.h>
 
@@ -124,7 +123,7 @@
 bool OpenPartition(FastbootDevice* device, const std::string& name, PartitionHandle* handle,
                    int flags = O_WRONLY);
 
-bool GetSlotNumber(const std::string& slot, android::hardware::boot::V1_0::Slot* number);
+bool GetSlotNumber(const std::string& slot, int32_t* number);
 std::vector<std::string> ListPartitions(FastbootDevice* device);
 bool GetDeviceLockStatus();
 
diff --git a/fastboot/device/variables.cpp b/fastboot/device/variables.cpp
index 0cf4699..d2a7947 100644
--- a/fastboot/device/variables.cpp
+++ b/fastboot/device/variables.cpp
@@ -17,6 +17,7 @@
 #include "variables.h"
 
 #include <inttypes.h>
+#include <stdio.h>
 
 #include <android-base/file.h>
 #include <android-base/logging.h>
@@ -28,6 +29,7 @@
 #include <fs_mgr.h>
 #include <liblp/liblp.h>
 
+#include "BootControlClient.h"
 #include "fastboot_device.h"
 #include "flashing.h"
 #include "utility.h"
@@ -38,14 +40,10 @@
 static constexpr bool kEnableFetch = false;
 #endif
 
-using ::android::hardware::boot::V1_0::BoolResult;
-using ::android::hardware::boot::V1_0::Slot;
-using ::android::hardware::boot::V1_1::MergeStatus;
-using ::android::hardware::fastboot::V1_0::FileSystemType;
-using ::android::hardware::fastboot::V1_0::Result;
-using ::android::hardware::fastboot::V1_0::Status;
-using IBootControl1_1 = ::android::hardware::boot::V1_1::IBootControl;
+using MergeStatus = android::hal::BootControlClient::MergeStatus;
+using aidl::android::hardware::fastboot::FileSystemType;
 using namespace android::fs_mgr;
+using namespace std::string_literals;
 
 constexpr char kFastbootProtocolVersion[] = "0.4";
 
@@ -104,17 +102,16 @@
         *message = "Fastboot HAL not found";
         return false;
     }
+    std::string device_variant = "";
+    auto status = fastboot_hal->getVariant(&device_variant);
 
-    Result ret;
-    auto ret_val = fastboot_hal->getVariant([&](std::string device_variant, Result result) {
-        *message = device_variant;
-        ret = result;
-    });
-    if (!ret_val.isOk() || ret.status != Status::SUCCESS) {
+    if (!status.isOk()) {
         *message = "Unable to get device variant";
+        LOG(ERROR) << message->c_str() << status.getDescription();
         return false;
     }
 
+    *message = device_variant;
     return true;
 }
 
@@ -147,17 +144,14 @@
         return false;
     }
 
-    Result ret;
-    auto ret_val = fastboot_hal->getBatteryVoltageFlashingThreshold(
-            [&](int32_t voltage_threshold, Result result) {
-                *message = battery_voltage >= voltage_threshold ? "yes" : "no";
-                ret = result;
-            });
-
-    if (!ret_val.isOk() || ret.status != Status::SUCCESS) {
+    auto voltage_threshold = 0;
+    auto status = fastboot_hal->getBatteryVoltageFlashingThreshold(&voltage_threshold);
+    if (!status.isOk()) {
         *message = "Unable to get battery voltage flashing threshold";
+        LOG(ERROR) << message->c_str() << status.getDescription();
         return false;
     }
+    *message = battery_voltage >= voltage_threshold ? "yes" : "no";
 
     return true;
 }
@@ -169,18 +163,14 @@
         *message = "Fastboot HAL not found";
         return false;
     }
-
-    Result ret;
-    auto ret_val =
-            fastboot_hal->getOffModeChargeState([&](bool off_mode_charging_state, Result result) {
-                *message = off_mode_charging_state ? "1" : "0";
-                ret = result;
-            });
-    if (!ret_val.isOk() || (ret.status != Status::SUCCESS)) {
+    bool off_mode_charging_state = false;
+    auto status = fastboot_hal->getOffModeChargeState(&off_mode_charging_state);
+    if (!status.isOk()) {
         *message = "Unable to get off mode charge state";
+        LOG(ERROR) << message->c_str() << status.getDescription();
         return false;
     }
-
+    *message = off_mode_charging_state ? "1" : "0";
     return true;
 }
 
@@ -208,7 +198,7 @@
     if (!boot_control_hal) {
         *message = "0";
     } else {
-        *message = std::to_string(boot_control_hal->getNumberSlots());
+        *message = std::to_string(boot_control_hal->GetNumSlots());
     }
     return true;
 }
@@ -219,7 +209,7 @@
         *message = "Missing argument";
         return false;
     }
-    Slot slot;
+    int32_t slot = -1;
     if (!GetSlotNumber(args[0], &slot)) {
         *message = "Invalid slot";
         return false;
@@ -229,7 +219,7 @@
         *message = "Device has no slots";
         return false;
     }
-    if (boot_control_hal->isSlotMarkedSuccessful(slot) != BoolResult::TRUE) {
+    if (boot_control_hal->IsSlotMarkedSuccessful(slot).value_or(false)) {
         *message = "no";
     } else {
         *message = "yes";
@@ -243,7 +233,7 @@
         *message = "Missing argument";
         return false;
     }
-    Slot slot;
+    int32_t slot = -1;
     if (!GetSlotNumber(args[0], &slot)) {
         *message = "Invalid slot";
         return false;
@@ -253,7 +243,7 @@
         *message = "Device has no slots";
         return false;
     }
-    if (boot_control_hal->isSlotBootable(slot) != BoolResult::TRUE) {
+    if (!boot_control_hal->IsSlotBootable(slot).value_or(false)) {
         *message = "yes";
     } else {
         *message = "no";
@@ -337,14 +327,11 @@
     }
 
     FileSystemType type;
-    Result ret;
-    auto ret_val =
-            fastboot_hal->getPartitionType(args[0], [&](FileSystemType fs_type, Result result) {
-                type = fs_type;
-                ret = result;
-            });
-    if (!ret_val.isOk() || (ret.status != Status::SUCCESS)) {
+    auto status = fastboot_hal->getPartitionType(args[0], &type);
+
+    if (!status.isOk()) {
         *message = "Unable to retrieve partition type";
+        LOG(ERROR) << message->c_str() << status.getDescription();
     } else {
         switch (type) {
             case FileSystemType::RAW:
@@ -392,6 +379,12 @@
     return true;
 }
 
+bool GetIsForceDebuggable(FastbootDevice* /* device */, const std::vector<std::string>& /* args */,
+                          std::string* message) {
+    *message = android::base::GetBoolProperty("ro.force.debuggable", false) ? "yes" : "no";
+    return true;
+}
+
 std::vector<std::vector<std::string>> GetAllPartitionArgsWithSlot(FastbootDevice* device) {
     std::vector<std::vector<std::string>> args;
     auto partitions = ListPartitions(device);
@@ -518,3 +511,36 @@
     *message = android::base::StringPrintf("0x%X", kMaxFetchSizeDefault);
     return true;
 }
+
+bool GetDmesg(FastbootDevice* device) {
+    if (GetDeviceLockStatus()) {
+        return device->WriteFail("Cannot use when device flashing is locked");
+    }
+
+    std::unique_ptr<FILE, decltype(&::fclose)> fp(popen("/system/bin/dmesg", "re"), ::fclose);
+    if (!fp) {
+        PLOG(ERROR) << "popen /system/bin/dmesg";
+        return device->WriteFail("Unable to run dmesg: "s + strerror(errno));
+    }
+
+    ssize_t rv;
+    size_t n = 0;
+    char* str = nullptr;
+    while ((rv = ::getline(&str, &n, fp.get())) > 0) {
+        if (str[rv - 1] == '\n') {
+            rv--;
+        }
+        device->WriteInfo(std::string(str, rv));
+    }
+
+    int saved_errno = errno;
+    ::free(str);
+
+    if (rv < 0 && saved_errno) {
+        LOG(ERROR) << "dmesg getline: " << strerror(saved_errno);
+        device->WriteFail("Unable to read dmesg: "s + strerror(saved_errno));
+        return false;
+    }
+
+    return true;
+}
diff --git a/fastboot/device/variables.h b/fastboot/device/variables.h
index f40a025..3b2d484 100644
--- a/fastboot/device/variables.h
+++ b/fastboot/device/variables.h
@@ -54,6 +54,8 @@
                            std::string* message);
 bool GetIsUserspace(FastbootDevice* device, const std::vector<std::string>& args,
                     std::string* message);
+bool GetIsForceDebuggable(FastbootDevice* device, const std::vector<std::string>& args,
+                          std::string* message);
 bool GetHardwareRevision(FastbootDevice* device, const std::vector<std::string>& args,
                          std::string* message);
 bool GetVariant(FastbootDevice* device, const std::vector<std::string>& args, std::string* message);
@@ -83,6 +85,9 @@
 bool GetMaxFetchSize(FastbootDevice* /* device */, const std::vector<std::string>& /* args */,
                      std::string* message);
 
+// Complex cases.
+bool GetDmesg(FastbootDevice* device);
+
 // Helpers for getvar all.
 std::vector<std::vector<std::string>> GetAllPartitionArgsWithSlot(FastbootDevice* device);
 std::vector<std::vector<std::string>> GetAllPartitionArgsNoSlot(FastbootDevice* device);
diff --git a/fastboot/fastboot.cpp b/fastboot/fastboot.cpp
index 79c3ac7..f1b82e9 100644
--- a/fastboot/fastboot.cpp
+++ b/fastboot/fastboot.cpp
@@ -129,23 +129,23 @@
 };
 
 struct Image {
-    const char* nickname;
-    const char* img_name;
-    const char* sig_name;
-    const char* part_name;
+    std::string nickname;
+    std::string img_name;
+    std::string sig_name;
+    std::string part_name;
     bool optional_if_no_image;
     ImageType type;
-    bool IsSecondary() const { return nickname == nullptr; }
+    bool IsSecondary() const { return nickname.empty(); }
 };
 
-static Image images[] = {
+static std::vector<Image> images = {
         // clang-format off
     { "boot",     "boot.img",         "boot.sig",     "boot",     false, ImageType::BootCritical },
     { "init_boot",
                   "init_boot.img",    "init_boot.sig",
                                                       "init_boot",
                                                                   true,  ImageType::BootCritical },
-    { nullptr,    "boot_other.img",   "boot.sig",     "boot",     true,  ImageType::Normal },
+    { "",    "boot_other.img",   "boot.sig",     "boot",     true,  ImageType::Normal },
     { "cache",    "cache.img",        "cache.sig",    "cache",    true,  ImageType::Extra },
     { "dtbo",     "dtbo.img",         "dtbo.sig",     "dtbo",     true,  ImageType::BootCritical },
     { "dts",      "dt.img",           "dt.sig",       "dts",      true,  ImageType::BootCritical },
@@ -164,7 +164,7 @@
                   "system_ext.img",   "system_ext.sig",
                                                       "system_ext",
                                                                   true,  ImageType::Normal },
-    { nullptr,    "system_other.img", "system.sig",   "system",   true,  ImageType::Normal },
+    { "",    "system_other.img", "system.sig",   "system",   true,  ImageType::Normal },
     { "userdata", "userdata.img",     "userdata.sig", "userdata", true,  ImageType::Extra },
     { "vbmeta",   "vbmeta.img",       "vbmeta.sig",   "vbmeta",   true,  ImageType::BootCritical },
     { "vbmeta_system",
@@ -191,7 +191,7 @@
                                       "vendor_kernel_boot.sig",
                                                       "vendor_kernel_boot",
                                                                   true,  ImageType::BootCritical },
-    { nullptr,    "vendor_other.img", "vendor.sig",   "vendor",   true,  ImageType::Normal },
+    { "",    "vendor_other.img", "vendor.sig",   "vendor",   true,  ImageType::Normal },
         // clang-format on
 };
 
@@ -212,8 +212,8 @@
 }
 
 static std::string find_item(const std::string& item) {
-    for (size_t i = 0; i < arraysize(images); ++i) {
-        if (images[i].nickname && item == images[i].nickname) {
+    for (size_t i = 0; i < images.size(); ++i) {
+        if (!images[i].nickname.empty() && item == images[i].nickname) {
             return find_item_given_name(images[i].img_name);
         }
     }
@@ -274,7 +274,8 @@
     // require matching serial number or device path if requested
     // at the command line with the -s option.
     if (local_serial && (strcmp(local_serial, info->serial_number) != 0 &&
-                   strcmp(local_serial, info->device_path) != 0)) return -1;
+                         strcmp(local_serial, info->device_path) != 0))
+        return -1;
     return 0;
 }
 
@@ -532,15 +533,15 @@
     std::vector<char> dtb_data;
     if (!g_dtb_path.empty()) {
         if (g_boot_img_hdr.header_version != 2) {
-                    die("Argument dtb not supported for boot image header version %d\n",
-                        g_boot_img_hdr.header_version);
+            die("Argument dtb not supported for boot image header version %d\n",
+                g_boot_img_hdr.header_version);
         }
         if (!ReadFileToVector(g_dtb_path, &dtb_data)) {
             die("cannot load '%s': %s", g_dtb_path.c_str(), strerror(errno));
         }
     }
 
-    fprintf(stderr,"creating boot image...\n");
+    fprintf(stderr, "creating boot image...\n");
 
     std::vector<char> out;
     mkbootimg(kernel_data, ramdisk_data, second_stage_data, dtb_data, g_base_addr, g_boot_img_hdr,
@@ -562,15 +563,15 @@
     }
 
     if (zip_entry.uncompressed_length > std::numeric_limits<size_t>::max()) {
-      die("entry '%s' is too large: %" PRIu64, entry_name.c_str(), zip_entry.uncompressed_length);
+        die("entry '%s' is too large: %" PRIu64, entry_name.c_str(), zip_entry.uncompressed_length);
     }
     out->resize(zip_entry.uncompressed_length);
 
     fprintf(stderr, "extracting %s (%zu MB) to RAM...\n", entry_name.c_str(),
             out->size() / 1024 / 1024);
 
-    int error = ExtractToMemory(zip, &zip_entry, reinterpret_cast<uint8_t*>(out->data()),
-                                out->size());
+    int error =
+            ExtractToMemory(zip, &zip_entry, reinterpret_cast<uint8_t*>(out->data()), out->size());
     if (error != 0) die("failed to extract '%s': %s", entry_name.c_str(), ErrorCodeString(error));
 
     return true;
@@ -618,8 +619,8 @@
     std::string path_template(make_temporary_template());
     int fd = mkstemp(&path_template[0]);
     if (fd == -1) {
-        die("failed to create temporary file for %s with template %s: %s\n",
-            path_template.c_str(), what, strerror(errno));
+        die("failed to create temporary file for %s with template %s: %s\n", path_template.c_str(),
+            what, strerror(errno));
     }
     unlink(path_template.c_str());
     return fd;
@@ -673,16 +674,15 @@
     std::string var_value;
     if (fb->GetVar(var, &var_value) != fastboot::SUCCESS) {
         fprintf(stderr, "FAILED\n\n");
-        fprintf(stderr, "Could not getvar for '%s' (%s)\n\n", var.c_str(),
-                fb->Error().c_str());
+        fprintf(stderr, "Could not getvar for '%s' (%s)\n\n", var.c_str(), fb->Error().c_str());
         return false;
     }
 
     bool match = false;
     for (const auto& option : options) {
-        if (option == var_value || (option.back() == '*' &&
-                                    !var_value.compare(0, option.length() - 1, option, 0,
-                                                       option.length() - 1))) {
+        if (option == var_value ||
+            (option.back() == '*' &&
+             !var_value.compare(0, option.length() - 1, option, 0, option.length() - 1))) {
             match = true;
             break;
         }
@@ -757,8 +757,8 @@
         die("device doesn't have required partition %s!", partition_name.c_str());
     }
     bool known_partition = false;
-    for (size_t i = 0; i < arraysize(images); ++i) {
-        if (images[i].nickname && images[i].nickname == partition_name) {
+    for (size_t i = 0; i < images.size(); ++i) {
+        if (!images[i].nickname.empty() && images[i].nickname == partition_name) {
             images[i].optional_if_no_image = false;
             known_partition = true;
         }
@@ -796,9 +796,9 @@
             bool met = CheckRequirement(cur_product, name, product, invert, options);
             if (!met) {
                 if (!force_flash) {
-                  die("requirements not met!");
+                    die("requirements not met!");
                 } else {
-                  fprintf(stderr, "requirements not met! but proceeding due to --force\n");
+                    fprintf(stderr, "requirements not met! but proceeding due to --force\n");
                 }
             }
         }
@@ -822,7 +822,6 @@
     DisplayVarOrError("Baseband Version.....", "version-baseband");
     DisplayVarOrError("Serial Number........", "serialno");
     fprintf(stderr, "--------------------------------------------\n");
-
 }
 
 static struct sparse_file** load_sparse_files(int fd, int64_t max_size) {
@@ -830,13 +829,14 @@
     if (!s) die("cannot sparse read file");
 
     if (max_size <= 0 || max_size > std::numeric_limits<uint32_t>::max()) {
-      die("invalid max size %" PRId64, max_size);
+        die("invalid max size %" PRId64, max_size);
     }
 
     int files = sparse_file_resparse(s, max_size, nullptr, 0);
     if (files < 0) die("Failed to resparse");
 
-    sparse_file** out_s = reinterpret_cast<sparse_file**>(calloc(sizeof(struct sparse_file *), files + 1));
+    sparse_file** out_s =
+            reinterpret_cast<sparse_file**>(calloc(sizeof(struct sparse_file*), files + 1));
     if (!out_s) die("Failed to allocate sparse file array");
 
     files = sparse_file_resparse(s, max_size, out_s, files);
@@ -1078,8 +1078,7 @@
     lseek(buf->fd.get(), 0, SEEK_SET);
 }
 
-static void flash_buf(const std::string& partition, struct fastboot_buffer *buf)
-{
+static void flash_buf(const std::string& partition, struct fastboot_buffer* buf) {
     sparse_file** s;
 
     if (partition == "boot" || partition == "boot_a" || partition == "boot_b" ||
@@ -1097,7 +1096,7 @@
             rewrite_vbmeta_buffer(buf, false /* vbmeta_in_boot */);
         } else if (!has_vbmeta_partition() &&
                    (partition == "boot" || partition == "boot_a" || partition == "boot_b")) {
-            rewrite_vbmeta_buffer(buf, true /* vbmeta_in_boot */ );
+            rewrite_vbmeta_buffer(buf, true /* vbmeta_in_boot */);
         }
     }
 
@@ -1143,14 +1142,14 @@
 }
 
 static bool supports_AB() {
-  return get_slot_count() >= 2;
+    return get_slot_count() >= 2;
 }
 
 // Given a current slot, this returns what the 'other' slot is.
 static std::string get_other_slot(const std::string& current_slot, int count) {
     if (count == 0) return "";
 
-    char next = (current_slot[0] - 'a' + 1)%count + 'a';
+    char next = (current_slot[0] - 'a' + 1) % count + 'a';
     return std::string(1, next);
 }
 
@@ -1185,17 +1184,17 @@
     if (count == 0) die("Device does not support slots");
 
     if (slot == "other") {
-        std::string other = get_other_slot( count);
+        std::string other = get_other_slot(count);
         if (other == "") {
-           die("No known slots");
+            die("No known slots");
         }
         return other;
     }
 
-    if (slot.size() == 1 && (slot[0]-'a' >= 0 && slot[0]-'a' < count)) return slot;
+    if (slot.size() == 1 && (slot[0] - 'a' >= 0 && slot[0] - 'a' < count)) return slot;
 
     fprintf(stderr, "Slot %s does not exist. supported slots are:\n", slot.c_str());
-    for (int i=0; i<count; i++) {
+    for (int i = 0; i < count; i++) {
         fprintf(stderr, "%c\n", (char)(i + 'a'));
     }
 
@@ -1203,7 +1202,7 @@
 }
 
 static std::string verify_slot(const std::string& slot) {
-   return verify_slot(slot, true);
+    return verify_slot(slot, true);
 }
 
 static void do_for_partition(const std::string& part, const std::string& slot,
@@ -1243,7 +1242,8 @@
  * partition does not support slots.
  */
 static void do_for_partitions(const std::string& part, const std::string& slot,
-                              const std::function<void(const std::string&)>& func, bool force_slot) {
+                              const std::function<void(const std::string&)>& func,
+                              bool force_slot) {
     std::string has_slot;
     // |part| can be vendor_boot:default. Query has-slot on the first token only.
     auto part_tokens = android::base::Split(part, ":");
@@ -1254,7 +1254,7 @@
                 slot.c_str());
         }
         if (has_slot == "yes") {
-            for (int i=0; i < get_slot_count(); i++) {
+            for (int i = 0; i < get_slot_count(); i++) {
                 do_for_partition(part, std::string(1, (char)(i + 'a')), func, force_slot);
             }
         } else {
@@ -1403,7 +1403,7 @@
 
 class ImageSource {
   public:
-    virtual ~ImageSource() {};
+    virtual ~ImageSource(){};
     virtual bool ReadFile(const std::string& name, std::vector<char>* out) const = 0;
     virtual unique_fd OpenFile(const std::string& name) const = 0;
 };
@@ -1435,13 +1435,11 @@
 
 FlashAllTool::FlashAllTool(const ImageSource& source, const std::string& slot_override,
                            bool skip_secondary, bool wipe, bool force_flash)
-   : source_(source),
-     slot_override_(slot_override),
-     skip_secondary_(skip_secondary),
-     wipe_(wipe),
-     force_flash_(force_flash)
-{
-}
+    : source_(source),
+      slot_override_(slot_override),
+      skip_secondary_(skip_secondary),
+      wipe_(wipe),
+      force_flash_(force_flash) {}
 
 void FlashAllTool::Flash() {
     DumpInfo();
@@ -1508,7 +1506,7 @@
 }
 
 void FlashAllTool::CollectImages() {
-    for (size_t i = 0; i < arraysize(images); ++i) {
+    for (size_t i = 0; i < images.size(); ++i) {
         std::string slot = slot_override_;
         if (images[i].IsSecondary()) {
             if (skip_secondary_) {
@@ -1532,7 +1530,7 @@
             if (image->optional_if_no_image) {
                 continue;
             }
-            die("could not load '%s': %s", image->img_name, strerror(errno));
+            die("could not load '%s': %s", image->img_name.c_str(), strerror(errno));
         }
         FlashImage(*image, slot, &buf);
     }
@@ -1683,10 +1681,9 @@
     return size;
 }
 
-static void fb_perform_format(
-                              const std::string& partition, int skip_if_not_supported,
+static void fb_perform_format(const std::string& partition, int skip_if_not_supported,
                               const std::string& type_override, const std::string& size_override,
-                              const std::string& initial_dir, const unsigned fs_options) {
+                              const unsigned fs_options) {
     std::string partition_type, partition_size;
 
     struct fastboot_buffer buf;
@@ -1735,8 +1732,7 @@
             fprintf(stderr, "File system type %s not supported.\n", partition_type.c_str());
             return;
         }
-        die("Formatting is not supported for file system with type '%s'.",
-            partition_type.c_str());
+        die("Formatting is not supported for file system with type '%s'.", partition_type.c_str());
     }
 
     int64_t size;
@@ -1748,8 +1744,7 @@
     eraseBlkSize = fb_get_flash_block_size("erase-block-size");
     logicalBlkSize = fb_get_flash_block_size("logical-block-size");
 
-    if (fs_generator_generate(gen, output.path, size, initial_dir,
-            eraseBlkSize, logicalBlkSize, fs_options)) {
+    if (fs_generator_generate(gen, output.path, size, eraseBlkSize, logicalBlkSize, fs_options)) {
         die("Cannot generate image for %s", partition.c_str());
     }
 
@@ -1894,32 +1889,30 @@
     g_boot_img_hdr.page_size = 2048;
     g_boot_img_hdr.dtb_addr = 0x01100000;
 
-    const struct option longopts[] = {
-        {"base", required_argument, 0, 0},
-        {"cmdline", required_argument, 0, 0},
-        {"disable-verification", no_argument, 0, 0},
-        {"disable-verity", no_argument, 0, 0},
-        {"force", no_argument, 0, 0},
-        {"fs-options", required_argument, 0, 0},
-        {"header-version", required_argument, 0, 0},
-        {"help", no_argument, 0, 'h'},
-        {"kernel-offset", required_argument, 0, 0},
-        {"os-patch-level", required_argument, 0, 0},
-        {"os-version", required_argument, 0, 0},
-        {"page-size", required_argument, 0, 0},
-        {"ramdisk-offset", required_argument, 0, 0},
-        {"set-active", optional_argument, 0, 'a'},
-        {"skip-reboot", no_argument, 0, 0},
-        {"skip-secondary", no_argument, 0, 0},
-        {"slot", required_argument, 0, 0},
-        {"tags-offset", required_argument, 0, 0},
-        {"dtb", required_argument, 0, 0},
-        {"dtb-offset", required_argument, 0, 0},
-        {"unbuffered", no_argument, 0, 0},
-        {"verbose", no_argument, 0, 'v'},
-        {"version", no_argument, 0, 0},
-        {0, 0, 0, 0}
-    };
+    const struct option longopts[] = {{"base", required_argument, 0, 0},
+                                      {"cmdline", required_argument, 0, 0},
+                                      {"disable-verification", no_argument, 0, 0},
+                                      {"disable-verity", no_argument, 0, 0},
+                                      {"force", no_argument, 0, 0},
+                                      {"fs-options", required_argument, 0, 0},
+                                      {"header-version", required_argument, 0, 0},
+                                      {"help", no_argument, 0, 'h'},
+                                      {"kernel-offset", required_argument, 0, 0},
+                                      {"os-patch-level", required_argument, 0, 0},
+                                      {"os-version", required_argument, 0, 0},
+                                      {"page-size", required_argument, 0, 0},
+                                      {"ramdisk-offset", required_argument, 0, 0},
+                                      {"set-active", optional_argument, 0, 'a'},
+                                      {"skip-reboot", no_argument, 0, 0},
+                                      {"skip-secondary", no_argument, 0, 0},
+                                      {"slot", required_argument, 0, 0},
+                                      {"tags-offset", required_argument, 0, 0},
+                                      {"dtb", required_argument, 0, 0},
+                                      {"dtb-offset", required_argument, 0, 0},
+                                      {"unbuffered", no_argument, 0, 0},
+                                      {"verbose", no_argument, 0, 'v'},
+                                      {"version", no_argument, 0, 0},
+                                      {0, 0, 0, 0}};
 
     serial = getenv("ANDROID_SERIAL");
 
@@ -1968,7 +1961,8 @@
                 setvbuf(stdout, nullptr, _IONBF, 0);
                 setvbuf(stderr, nullptr, _IONBF, 0);
             } else if (name == "version") {
-                fprintf(stdout, "fastboot version %s-%s\n", PLATFORM_TOOLS_VERSION, android::build::GetBuildNumber().c_str());
+                fprintf(stdout, "fastboot version %s-%s\n", PLATFORM_TOOLS_VERSION,
+                        android::build::GetBuildNumber().c_str());
                 fprintf(stdout, "Installed as %s\n", android::base::GetExecutablePath().c_str());
                 return 0;
             } else {
@@ -2026,9 +2020,9 @@
         return 1;
     }
     fastboot::DriverCallbacks driver_callbacks = {
-        .prolog = Status,
-        .epilog = Epilog,
-        .info = InfoMessage,
+            .prolog = Status,
+            .epilog = Epilog,
+            .info = InfoMessage,
     };
     fastboot::FastBootDriver fastboot_driver(transport, driver_callbacks, false);
     fb = &fastboot_driver;
@@ -2065,7 +2059,8 @@
             std::string partition = next_arg(&args);
             auto erase = [&](const std::string& partition) {
                 std::string partition_type;
-                if (fb->GetVar("partition-type:" + partition, &partition_type) == fastboot::SUCCESS &&
+                if (fb->GetVar("partition-type:" + partition, &partition_type) ==
+                            fastboot::SUCCESS &&
                     fs_get_generator(partition_type) != nullptr) {
                     fprintf(stderr, "******** Did you mean to fastboot format this %s partition?\n",
                             partition_type.c_str());
@@ -2091,7 +2086,7 @@
             std::string partition = next_arg(&args);
 
             auto format = [&](const std::string& partition) {
-                fb_perform_format(partition, 0, type_override, size_override, "", fs_options);
+                fb_perform_format(partition, 0, type_override, size_override, fs_options);
             };
             do_for_partitions(partition, slot_override, format, true);
         } else if (command == "signature") {
@@ -2120,7 +2115,6 @@
                 } else {
                     syntax_error("unknown reboot target %s", what.c_str());
                 }
-
             }
             if (!args.empty()) syntax_error("junk after reboot command");
         } else if (command == FB_CMD_REBOOT_BOOTLOADER) {
@@ -2151,7 +2145,7 @@
             }
             if (fname.empty()) die("cannot determine image filename for '%s'", pname.c_str());
 
-            auto flash = [&](const std::string &partition) {
+            auto flash = [&](const std::string& partition) {
                 if (should_flash_in_userspace(partition) && !is_userspace_fastboot() &&
                     !force_flash) {
                     die("The partition you are trying to flash is dynamic, and "
@@ -2180,7 +2174,8 @@
             do_for_partitions(partition, slot_override, flashraw, true);
         } else if (command == "flashall") {
             if (slot_override == "all") {
-                fprintf(stderr, "Warning: slot set to 'all'. Secondary slots will not be flashed.\n");
+                fprintf(stderr,
+                        "Warning: slot set to 'all'. Secondary slots will not be flashed.\n");
                 do_flashall(slot_override, true, wants_wipe, force_flash);
             } else {
                 do_flashall(slot_override, skip_secondary, wants_wipe, force_flash);
@@ -2189,7 +2184,8 @@
         } else if (command == "update") {
             bool slot_all = (slot_override == "all");
             if (slot_all) {
-                fprintf(stderr, "Warning: slot set to 'all'. Secondary slots will not be flashed.\n");
+                fprintf(stderr,
+                        "Warning: slot set to 'all'. Secondary slots will not be flashed.\n");
             }
             std::string filename = "update.zip";
             if (!args.empty()) {
@@ -2216,10 +2212,9 @@
         } else if (command == "flashing") {
             if (args.empty()) {
                 syntax_error("missing 'flashing' command");
-            } else if (args.size() == 1 && (args[0] == "unlock" || args[0] == "lock" ||
-                                            args[0] == "unlock_critical" ||
-                                            args[0] == "lock_critical" ||
-                                            args[0] == "get_unlock_ability")) {
+            } else if (args.size() == 1 &&
+                       (args[0] == "unlock" || args[0] == "lock" || args[0] == "unlock_critical" ||
+                        args[0] == "lock_critical" || args[0] == "get_unlock_ability")) {
                 do_oem_command("flashing", &args);
             } else {
                 syntax_error("unknown 'flashing' command %s", args[0].c_str());
@@ -2274,7 +2269,7 @@
         if (force_flash) {
             CancelSnapshotIfNeeded();
         }
-        std::vector<std::string> partitions = { "userdata", "cache", "metadata" };
+        std::vector<std::string> partitions = {"userdata", "cache", "metadata"};
         for (const auto& partition : partitions) {
             std::string partition_type;
             if (fb->GetVar("partition-type:" + partition, &partition_type) != fastboot::SUCCESS) {
@@ -2282,7 +2277,7 @@
             }
             if (partition_type.empty()) continue;
             fb->Erase(partition);
-            fb_perform_format(partition, 1, partition_type, "", "", fs_options);
+            fb_perform_format(partition, 1, partition_type, "", fs_options);
         }
     }
     if (wants_set_active) {
@@ -2336,8 +2331,7 @@
     unsigned fsOptions = 0;
 
     std::vector<std::string> options = android::base::Split(arg, ",");
-    if (options.size() < 1)
-        syntax_error("bad options: %s", arg);
+    if (options.size() < 1) syntax_error("bad options: %s", arg);
 
     for (size_t i = 0; i < options.size(); ++i) {
         if (options[i] == "casefold")
diff --git a/fastboot/fs.cpp b/fastboot/fs.cpp
index d268a50..c8d1b59 100644
--- a/fastboot/fs.cpp
+++ b/fastboot/fs.cpp
@@ -111,8 +111,7 @@
 }
 #endif
 
-static int generate_ext4_image(const char* fileName, long long partSize,
-                               const std::string& initial_dir, unsigned eraseBlkSize,
+static int generate_ext4_image(const char* fileName, long long partSize, unsigned eraseBlkSize,
                                unsigned logicalBlkSize, const unsigned fsOptions) {
     static constexpr int block_size = 4096;
     const std::string exec_dir = android::base::GetExecutableDirectory();
@@ -163,16 +162,7 @@
     if (ret != 0) {
         return -1;
     }
-
-    if (initial_dir.empty()) {
-        return 0;
-    }
-
-    const std::string e2fsdroid_path = exec_dir + "/e2fsdroid";
-    std::vector<const char*> e2fsdroid_args = {e2fsdroid_path.c_str(), "-f", initial_dir.c_str(),
-                                               fileName, nullptr};
-
-    return exec_cmd(e2fsdroid_args[0], e2fsdroid_args.data(), nullptr);
+    return 0;
 }
 
 enum {
@@ -188,8 +178,7 @@
     // clang-format on
 };
 
-static int generate_f2fs_image(const char* fileName, long long partSize,
-                               const std::string& initial_dir, unsigned /* unused */,
+static int generate_f2fs_image(const char* fileName, long long partSize, unsigned /* unused */,
                                unsigned /* unused */, const unsigned fsOptions) {
     const std::string exec_dir = android::base::GetExecutableDirectory();
     const std::string mkf2fs_path = exec_dir + "/make_f2fs";
@@ -227,19 +216,6 @@
     if (ret != 0) {
         return -1;
     }
-
-    if (initial_dir.empty()) {
-        return 0;
-    }
-
-    const std::string sload_path = exec_dir + "/sload_f2fs";
-    std::vector<const char*> sload_args = {sload_path.c_str(), "-S",
-                                       "-f", initial_dir.c_str(), fileName, nullptr};
-
-    ret = exec_cmd(sload_args[0], sload_args.data(), nullptr);
-    if (ret != 0 && ret != FSCK_ERROR_CORRECTED) {
-        return -1;
-    }
     return 0;
 }
 
@@ -247,8 +223,8 @@
     const char* fs_type;  //must match what fastboot reports for partition type
 
     //returns 0 or error value
-    int (*generate)(const char* fileName, long long partSize, const std::string& initial_dir,
-                    unsigned eraseBlkSize, unsigned logicalBlkSize, const unsigned fsOptions);
+    int (*generate)(const char* fileName, long long partSize, unsigned eraseBlkSize,
+                    unsigned logicalBlkSize, const unsigned fsOptions);
 
 } generators[] = {
     { "ext4", generate_ext4_image},
@@ -265,7 +241,7 @@
 }
 
 int fs_generator_generate(const struct fs_generator* gen, const char* fileName, long long partSize,
-                          const std::string& initial_dir, unsigned eraseBlkSize,
-                          unsigned logicalBlkSize, const unsigned fsOptions) {
-    return gen->generate(fileName, partSize, initial_dir, eraseBlkSize, logicalBlkSize, fsOptions);
+                          unsigned eraseBlkSize, unsigned logicalBlkSize,
+                          const unsigned fsOptions) {
+    return gen->generate(fileName, partSize, eraseBlkSize, logicalBlkSize, fsOptions);
 }
diff --git a/fastboot/fs.h b/fastboot/fs.h
index f832938..5ae473b 100644
--- a/fastboot/fs.h
+++ b/fastboot/fs.h
@@ -13,5 +13,5 @@
 
 const struct fs_generator* fs_get_generator(const std::string& fs_type);
 int fs_generator_generate(const struct fs_generator* gen, const char* fileName, long long partSize,
-                          const std::string& initial_dir, unsigned eraseBlkSize = 0,
-                          unsigned logicalBlkSize = 0, unsigned fsOptions = 0);
+                          unsigned eraseBlkSize = 0, unsigned logicalBlkSize = 0,
+                          unsigned fsOptions = 0);
diff --git a/fastboot/fuzzy_fastboot/Android.bp b/fastboot/fuzzy_fastboot/Android.bp
index 159c314..2031170 100644
--- a/fastboot/fuzzy_fastboot/Android.bp
+++ b/fastboot/fuzzy_fastboot/Android.bp
@@ -9,6 +9,7 @@
 
 cc_test_host {
   name: "fuzzy_fastboot",
+  isolated: false,
   compile_multilib: "first",
 
   srcs: [
diff --git a/fastboot/fuzzy_fastboot/main.cpp b/fastboot/fuzzy_fastboot/main.cpp
index 074306b..e635937 100644
--- a/fastboot/fuzzy_fastboot/main.cpp
+++ b/fastboot/fuzzy_fastboot/main.cpp
@@ -901,19 +901,19 @@
             << "Device did not respond with failure after sending length " << s.size()
             << " string of random ASCII chars";
     if (ret == IO_ERROR) EXPECT_EQ(transport->Reset(), 0) << "USB reset failed";
-    std::string s1 = RandomString(1000, rand_legal);
+    std::string s1 = RandomString(10000, rand_legal);
     ret = fb->RawCommand(s1);
     EXPECT_TRUE(ret == DEVICE_FAIL || ret == IO_ERROR)
             << "Device did not respond with failure after sending length " << s1.size()
             << " string of random ASCII chars";
     if (ret == IO_ERROR) EXPECT_EQ(transport->Reset(), 0) << "USB reset failed";
-    std::string s2 = RandomString(1000, rand_illegal);
+    std::string s2 = RandomString(10000, rand_illegal);
     ret = fb->RawCommand(s2);
     EXPECT_TRUE(ret == DEVICE_FAIL || ret == IO_ERROR)
             << "Device did not respond with failure after sending length " << s2.size()
             << " string of random non-ASCII chars";
     if (ret == IO_ERROR) EXPECT_EQ(transport->Reset(), 0) << "USB reset failed";
-    std::string s3 = RandomString(1000, rand_char);
+    std::string s3 = RandomString(10000, rand_char);
     ret = fb->RawCommand(s3);
     EXPECT_TRUE(ret == DEVICE_FAIL || ret == IO_ERROR)
             << "Device did not respond with failure after sending length " << s3.size()
@@ -935,7 +935,7 @@
 
 TEST_F(Fuzz, CommandTooLarge) {
     for (const std::string& s : CMDS) {
-        std::string rs = RandomString(1000, rand_char);
+        std::string rs = RandomString(10000, rand_char);
         RetCode ret;
         ret = fb->RawCommand(s + rs);
         EXPECT_TRUE(ret == DEVICE_FAIL || ret == IO_ERROR)
diff --git a/fastboot/socket_test.cpp b/fastboot/socket_test.cpp
index 373abc3..74ff377 100644
--- a/fastboot/socket_test.cpp
+++ b/fastboot/socket_test.cpp
@@ -293,23 +293,23 @@
 }
 
 TEST(SocketMockTest, TestSendFailure) {
-    SocketMock* mock = new SocketMock;
+    std::unique_ptr<SocketMock> mock(new SocketMock);
 
     mock->ExpectSendFailure("foo");
-    EXPECT_FALSE(SendString(mock, "foo"));
+    EXPECT_FALSE(SendString(mock.get(), "foo"));
 
-    EXPECT_NONFATAL_FAILURE(SendString(mock, "foo"), "no message was expected");
+    EXPECT_NONFATAL_FAILURE(SendString(mock.get(), "foo"), "no message was expected");
 
     mock->ExpectSend("foo");
-    EXPECT_NONFATAL_FAILURE(SendString(mock, "bar"), "expected foo, but got bar");
-    EXPECT_TRUE(SendString(mock, "foo"));
+    EXPECT_NONFATAL_FAILURE(SendString(mock.get(), "bar"), "expected foo, but got bar");
+    EXPECT_TRUE(SendString(mock.get(), "foo"));
 
     mock->AddReceive("foo");
-    EXPECT_NONFATAL_FAILURE(SendString(mock, "foo"), "called out-of-order");
-    EXPECT_TRUE(ReceiveString(mock, "foo"));
+    EXPECT_NONFATAL_FAILURE(SendString(mock.get(), "foo"), "called out-of-order");
+    EXPECT_TRUE(ReceiveString(mock.get(), "foo"));
 
     mock->ExpectSend("foo");
-    EXPECT_NONFATAL_FAILURE(delete mock, "1 event(s) were not handled");
+    EXPECT_NONFATAL_FAILURE(mock.reset(), "1 event(s) were not handled");
 }
 
 TEST(SocketMockTest, TestReceiveSuccess) {
@@ -331,33 +331,33 @@
 }
 
 TEST(SocketMockTest, TestReceiveFailure) {
-    SocketMock* mock = new SocketMock;
+    std::unique_ptr<SocketMock> mock(new SocketMock);
 
     mock->AddReceiveFailure();
-    EXPECT_FALSE(ReceiveString(mock, "foo"));
+    EXPECT_FALSE(ReceiveString(mock.get(), "foo"));
     EXPECT_FALSE(mock->ReceiveTimedOut());
 
     mock->AddReceiveTimeout();
-    EXPECT_FALSE(ReceiveString(mock, "foo"));
+    EXPECT_FALSE(ReceiveString(mock.get(), "foo"));
     EXPECT_TRUE(mock->ReceiveTimedOut());
 
     mock->AddReceive("foo");
     mock->AddReceiveFailure();
-    EXPECT_FALSE(ReceiveString(mock, "foobar"));
+    EXPECT_FALSE(ReceiveString(mock.get(), "foobar"));
 
-    EXPECT_NONFATAL_FAILURE(ReceiveString(mock, "foo"), "no message was ready");
+    EXPECT_NONFATAL_FAILURE(ReceiveString(mock.get(), "foo"), "no message was ready");
 
     mock->ExpectSend("foo");
-    EXPECT_NONFATAL_FAILURE(ReceiveString(mock, "foo"), "called out-of-order");
-    EXPECT_TRUE(SendString(mock, "foo"));
+    EXPECT_NONFATAL_FAILURE(ReceiveString(mock.get(), "foo"), "called out-of-order");
+    EXPECT_TRUE(SendString(mock.get(), "foo"));
 
     char c;
     mock->AddReceive("foo");
     EXPECT_NONFATAL_FAILURE(mock->Receive(&c, 1, 0), "not enough bytes (1) for foo");
-    EXPECT_TRUE(ReceiveString(mock, "foo"));
+    EXPECT_TRUE(ReceiveString(mock.get(), "foo"));
 
     mock->AddReceive("foo");
-    EXPECT_NONFATAL_FAILURE(delete mock, "1 event(s) were not handled");
+    EXPECT_NONFATAL_FAILURE(mock.reset(), "1 event(s) were not handled");
 }
 
 TEST(SocketMockTest, TestAcceptSuccess) {
@@ -372,14 +372,14 @@
 }
 
 TEST(SocketMockTest, TestAcceptFailure) {
-    SocketMock* mock = new SocketMock;
+    std::unique_ptr<SocketMock> mock(new SocketMock);
 
     EXPECT_NONFATAL_FAILURE(mock->Accept(), "no socket was ready");
 
     mock->ExpectSend("foo");
     EXPECT_NONFATAL_FAILURE(mock->Accept(), "called out-of-order");
-    EXPECT_TRUE(SendString(mock, "foo"));
+    EXPECT_TRUE(SendString(mock.get(), "foo"));
 
     mock->AddAccept(nullptr);
-    EXPECT_NONFATAL_FAILURE(delete mock, "1 event(s) were not handled");
+    EXPECT_NONFATAL_FAILURE(mock.reset(), "1 event(s) were not handled");
 }
diff --git a/fastboot/vendor_boot_img_utils.cpp b/fastboot/vendor_boot_img_utils.cpp
index 9e09abb..9f05253 100644
--- a/fastboot/vendor_boot_img_utils.cpp
+++ b/fastboot/vendor_boot_img_utils.cpp
@@ -152,6 +152,9 @@
     if (memcmp(hdr->magic, VENDOR_BOOT_MAGIC, VENDOR_BOOT_MAGIC_SIZE) != 0) {
         return Errorf("Vendor boot image magic mismatch");
     }
+    if (hdr->page_size == 0) {
+        return Errorf("Page size cannot be zero");
+    }
     if (hdr->header_version < version) {
         return Errorf("Require vendor boot header V{} but is V{}", version, hdr->header_version);
     }
@@ -199,6 +202,7 @@
 }
 
 // round |value| up to a multiple of |page_size|.
+// aware that this can be integer overflow if value is too large
 inline uint32_t round_up(uint32_t value, uint32_t page_size) {
     return (value + page_size - 1) / page_size * page_size;
 }
@@ -311,7 +315,13 @@
     const uint32_t r = round_up(hdr->vendor_ramdisk_table_size, hdr->page_size);
     const uint32_t s = round_up(hdr->bootconfig_size, hdr->page_size);
 
-    if (hdr->vendor_ramdisk_table_entry_num == std::numeric_limits<uint32_t>::max()) {
+    uint64_t total_size = (uint64_t)o + p + q + r + s;
+    if (total_size > vendor_boot.size()) {
+        return Errorf("Vendor boot image size is too small, overflow");
+    }
+
+    if ((uint64_t)hdr->vendor_ramdisk_table_entry_num * sizeof(vendor_ramdisk_table_entry_v4) >
+        (uint64_t)o + p + q + r) {
         return Errorf("Too many vendor ramdisk entries in table, overflow");
     }
 
diff --git a/fs_mgr/Android.bp b/fs_mgr/Android.bp
index 49761ac..dd61272 100644
--- a/fs_mgr/Android.bp
+++ b/fs_mgr/Android.bp
@@ -223,7 +223,6 @@
         "libcutils",
         "libcrypto",
         "libext4_utils",
-        "libfec",
         "libfs_mgr_binder",
         "liblog",
         "liblp",
@@ -252,5 +251,8 @@
     },
     symlinks: [
         "clean_scratch_files",
+        "disable-verity",
+        "enable-verity",
+        "set-verity-state",
     ],
 }
diff --git a/fs_mgr/OWNERS b/fs_mgr/OWNERS
index c6f9054..bd46489 100644
--- a/fs_mgr/OWNERS
+++ b/fs_mgr/OWNERS
@@ -1,4 +1,5 @@
-# Bug component: 30545
+# Bug component: 325626
 bowgotsai@google.com
 dvander@google.com
 elsk@google.com
+yochiang@google.com
diff --git a/fs_mgr/fs_mgr.cpp b/fs_mgr/fs_mgr.cpp
index 6863894..1c1ab48 100644
--- a/fs_mgr/fs_mgr.cpp
+++ b/fs_mgr/fs_mgr.cpp
@@ -22,6 +22,7 @@
 #include <fcntl.h>
 #include <inttypes.h>
 #include <libgen.h>
+#include <selinux/selinux.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -30,6 +31,7 @@
 #include <sys/stat.h>
 #include <sys/swap.h>
 #include <sys/types.h>
+#include <sys/utsname.h>
 #include <sys/wait.h>
 #include <time.h>
 #include <unistd.h>
@@ -90,9 +92,6 @@
 #define SYSFS_EXT4_VERITY "/sys/fs/ext4/features/verity"
 #define SYSFS_EXT4_CASEFOLD "/sys/fs/ext4/features/casefold"
 
-// FIXME: this should be in system/extras
-#define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800
-
 #define ARRAY_SIZE(a) (sizeof(a) / sizeof(*(a)))
 
 using android::base::Basename;
@@ -124,8 +123,8 @@
     FS_STAT_RO_MOUNT_FAILED = 0x0040,
     FS_STAT_RO_UNMOUNT_FAILED = 0x0080,
     FS_STAT_FULL_MOUNT_FAILED = 0x0100,
-    FS_STAT_E2FSCK_FAILED = 0x0200,
-    FS_STAT_E2FSCK_FS_FIXED = 0x0400,
+    FS_STAT_FSCK_FAILED = 0x0200,
+    FS_STAT_FSCK_FS_FIXED = 0x0400,
     FS_STAT_INVALID_MAGIC = 0x0800,
     FS_STAT_TOGGLE_QUOTAS_FAILED = 0x10000,
     FS_STAT_SET_RESERVED_BLOCKS_FAILED = 0x20000,
@@ -136,7 +135,6 @@
 };
 
 static void log_fs_stat(const std::string& blk_device, int fs_stat) {
-    if ((fs_stat & FS_STAT_IS_EXT4) == 0) return; // only log ext4
     std::string msg =
             android::base::StringPrintf("\nfs_stat,%s,0x%x\n", blk_device.c_str(), fs_stat);
     android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(FSCK_LOG_FILE, O_WRONLY | O_CLOEXEC |
@@ -166,7 +164,7 @@
     return fs_stat &
            (FS_STAT_E2FSCK_F_ALWAYS | FS_STAT_UNCLEAN_SHUTDOWN | FS_STAT_QUOTA_ENABLED |
             FS_STAT_RO_MOUNT_FAILED | FS_STAT_RO_UNMOUNT_FAILED | FS_STAT_FULL_MOUNT_FAILED |
-            FS_STAT_E2FSCK_FAILED | FS_STAT_TOGGLE_QUOTAS_FAILED |
+            FS_STAT_FSCK_FAILED | FS_STAT_TOGGLE_QUOTAS_FAILED |
             FS_STAT_SET_RESERVED_BLOCKS_FAILED | FS_STAT_ENABLE_ENCRYPTION_FAILED);
 }
 
@@ -255,10 +253,10 @@
             if (ret < 0) {
                 /* No need to check for error in fork, we can't really handle it now */
                 LERROR << "Failed trying to run " << E2FSCK_BIN;
-                *fs_stat |= FS_STAT_E2FSCK_FAILED;
+                *fs_stat |= FS_STAT_FSCK_FAILED;
             } else if (status != 0) {
                 LINFO << "e2fsck returned status 0x" << std::hex << status;
-                *fs_stat |= FS_STAT_E2FSCK_FS_FIXED;
+                *fs_stat |= FS_STAT_FSCK_FS_FIXED;
             }
         }
     } else if (is_f2fs(fs_type)) {
@@ -267,20 +265,30 @@
         const char* f2fs_fsck_forced_argv[] = {
                 F2FS_FSCK_BIN, "-f", "-c", "10000", "--debug-cache", blk_device.c_str()};
 
-        if (should_force_check(*fs_stat)) {
-            LINFO << "Running " << F2FS_FSCK_BIN << " -f -c 10000 --debug-cache "
-                  << realpath(blk_device);
-            ret = logwrap_fork_execvp(ARRAY_SIZE(f2fs_fsck_forced_argv), f2fs_fsck_forced_argv,
-                                      &status, false, LOG_KLOG | LOG_FILE, false, nullptr);
+        if (access(F2FS_FSCK_BIN, X_OK)) {
+            LINFO << "Not running " << F2FS_FSCK_BIN << " on " << realpath(blk_device)
+                  << " (executable not in system image)";
         } else {
-            LINFO << "Running " << F2FS_FSCK_BIN << " -a -c 10000 --debug-cache "
-                  << realpath(blk_device);
-            ret = logwrap_fork_execvp(ARRAY_SIZE(f2fs_fsck_argv), f2fs_fsck_argv, &status, false,
-                                      LOG_KLOG | LOG_FILE, false, nullptr);
-        }
-        if (ret < 0) {
-            /* No need to check for error in fork, we can't really handle it now */
-            LERROR << "Failed trying to run " << F2FS_FSCK_BIN;
+            if (should_force_check(*fs_stat)) {
+                LINFO << "Running " << F2FS_FSCK_BIN << " -f -c 10000 --debug-cache "
+                      << realpath(blk_device);
+                ret = logwrap_fork_execvp(ARRAY_SIZE(f2fs_fsck_forced_argv), f2fs_fsck_forced_argv,
+                                          &status, false, LOG_KLOG | LOG_FILE, false,
+                                          FSCK_LOG_FILE);
+            } else {
+                LINFO << "Running " << F2FS_FSCK_BIN << " -a -c 10000 --debug-cache "
+                      << realpath(blk_device);
+                ret = logwrap_fork_execvp(ARRAY_SIZE(f2fs_fsck_argv), f2fs_fsck_argv, &status,
+                                          false, LOG_KLOG | LOG_FILE, false, FSCK_LOG_FILE);
+            }
+            if (ret < 0) {
+                /* No need to check for error in fork, we can't really handle it now */
+                LERROR << "Failed trying to run " << F2FS_FSCK_BIN;
+                *fs_stat |= FS_STAT_FSCK_FAILED;
+            } else if (status != 0) {
+                LINFO << F2FS_FSCK_BIN << " returned status 0x" << std::hex << status;
+                *fs_stat |= FS_STAT_FSCK_FS_FIXED;
+            }
         }
     }
     android::base::SetProperty("ro.boottime.init.fsck." + Basename(target),
@@ -840,8 +848,10 @@
     if ((ret == 0) && (mountflags & MS_RDONLY) != 0) {
         fs_mgr_set_blk_ro(source);
     }
-    android::base::SetProperty("ro.boottime.init.mount." + Basename(target),
-                               std::to_string(t.duration().count()));
+    if (ret == 0) {
+        android::base::SetProperty("ro.boottime.init.mount." + Basename(target),
+                                   std::to_string(t.duration().count()));
+    }
     errno = save_errno;
     return ret;
 }
@@ -881,7 +891,7 @@
 // attempted_idx: On return, will indicate which fstab entry
 //     succeeded. In case of failure, it will be the start_idx.
 // Sets errno to match the 1st mount failure on failure.
-static bool mount_with_alternatives(const Fstab& fstab, int start_idx, int* end_idx,
+static bool mount_with_alternatives(Fstab& fstab, int start_idx, int* end_idx,
                                     int* attempted_idx) {
     unsigned long i;
     int mount_errno = 0;
@@ -895,12 +905,20 @@
         // Deal with alternate entries for the same point which are required to be all following
         // each other.
         if (mounted) {
-            LERROR << __FUNCTION__ << "(): skipping fstab dup mountpoint=" << fstab[i].mount_point
-                   << " rec[" << i << "].fs_type=" << fstab[i].fs_type << " already mounted as "
-                   << fstab[*attempted_idx].fs_type;
+            LINFO << __FUNCTION__ << "(): skipping fstab dup mountpoint=" << fstab[i].mount_point
+                  << " rec[" << i << "].fs_type=" << fstab[i].fs_type << " already mounted as "
+                  << fstab[*attempted_idx].fs_type;
             continue;
         }
 
+        // fstab[start_idx].blk_device is already updated to /dev/dm-<N> by
+        // AVB related functions. Copy it from start_idx to the current index i.
+        if ((i != start_idx) && fstab[i].fs_mgr_flags.logical &&
+            fstab[start_idx].fs_mgr_flags.logical &&
+            (fstab[i].logical_partition_name == fstab[start_idx].logical_partition_name)) {
+            fstab[i].blk_device = fstab[start_idx].blk_device;
+        }
+
         int fs_stat = prepare_fs_for_mount(fstab[i].blk_device, fstab[i]);
         if (fs_stat & FS_STAT_INVALID_MAGIC) {
             LERROR << __FUNCTION__
@@ -917,9 +935,9 @@
                 *attempted_idx = i;
                 mounted = true;
                 if (i != start_idx) {
-                    LERROR << __FUNCTION__ << "(): Mounted " << fstab[i].blk_device << " on "
-                           << fstab[i].mount_point << " with fs_type=" << fstab[i].fs_type
-                           << " instead of " << fstab[start_idx].fs_type;
+                    LINFO << __FUNCTION__ << "(): Mounted " << fstab[i].blk_device << " on "
+                          << fstab[i].mount_point << " with fs_type=" << fstab[i].fs_type
+                          << " instead of " << fstab[start_idx].fs_type;
                 }
                 fs_stat &= ~FS_STAT_FULL_MOUNT_FAILED;
                 mount_errno = 0;
@@ -1474,7 +1492,7 @@
                 if (status == FS_MGR_MNTALL_DEV_NEEDS_METADATA_ENCRYPTION) {
                     if (!call_vdc({"cryptfs", "encryptFstab", attempted_entry.blk_device,
                                    attempted_entry.mount_point, wiped ? "true" : "false",
-                                   attempted_entry.fs_type},
+                                   attempted_entry.fs_type, attempted_entry.zoned_device},
                                   nullptr)) {
                         LERROR << "Encryption failed";
                         set_type_property(encryptable);
@@ -1514,7 +1532,7 @@
 
                 if (!call_vdc({"cryptfs", "encryptFstab", current_entry.blk_device,
                                current_entry.mount_point, "true" /* shouldFormat */,
-                               current_entry.fs_type},
+                               current_entry.fs_type, current_entry.zoned_device},
                               nullptr)) {
                     LERROR << "Encryption failed";
                 } else {
@@ -1539,7 +1557,7 @@
         if (mount_errno != EBUSY && mount_errno != EACCES &&
             should_use_metadata_encryption(attempted_entry)) {
             if (!call_vdc({"cryptfs", "mountFstab", attempted_entry.blk_device,
-                           attempted_entry.mount_point},
+                           attempted_entry.mount_point, attempted_entry.zoned_device},
                           nullptr)) {
                 ++error_count;
             } else if (current_entry.mount_point == "/data") {
@@ -1911,6 +1929,7 @@
         while (retry_count-- > 0) {
             if (!__mount(n_blk_device, mount_point, fstab_entry)) {
                 fs_stat &= ~FS_STAT_FULL_MOUNT_FAILED;
+                log_fs_stat(fstab_entry.blk_device, fs_stat);
                 return FS_MGR_DOMNT_SUCCESS;
             } else {
                 if (retry_count <= 0) break;  // run check_fs only once
@@ -2172,36 +2191,22 @@
         std::vector<std::string> tokens = android::base::Split(target.data, " \t\r\n");
         if (tokens[0] != "0" && tokens[0] != "1") {
             LOG(WARNING) << "Unrecognized device mapper version in " << target.data;
-            return {};
         }
 
         // Hashtree algorithm & root digest are the 8th & 9th token in the output.
-        return HashtreeInfo{.algorithm = android::base::Trim(tokens[7]),
-                            .root_digest = android::base::Trim(tokens[8])};
+        return HashtreeInfo{
+                .algorithm = android::base::Trim(tokens[7]),
+                .root_digest = android::base::Trim(tokens[8]),
+                .check_at_most_once = target.data.find("check_at_most_once") != std::string::npos};
     }
 
     return {};
 }
 
 bool fs_mgr_verity_is_check_at_most_once(const android::fs_mgr::FstabEntry& entry) {
-    if (!entry.fs_mgr_flags.avb) {
-        return false;
-    }
-
-    DeviceMapper& dm = DeviceMapper::Instance();
-    std::string device = GetVerityDeviceName(entry);
-
-    std::vector<DeviceMapper::TargetInfo> table;
-    if (dm.GetState(device) == DmDeviceState::INVALID || !dm.GetTableInfo(device, &table)) {
-        return false;
-    }
-    for (const auto& target : table) {
-        if (strcmp(target.spec.target_type, "verity") == 0 &&
-            target.data.find("check_at_most_once") != std::string::npos) {
-            return true;
-        }
-    }
-    return false;
+    auto hashtree_info = fs_mgr_get_hashtree_info(entry);
+    if (!hashtree_info) return false;
+    return hashtree_info->check_at_most_once;
 }
 
 std::string fs_mgr_get_super_partition_name(int slot) {
@@ -2342,3 +2347,49 @@
 
     return true;
 }
+
+bool fs_mgr_filesystem_available(const std::string& filesystem) {
+    std::string filesystems;
+    if (!android::base::ReadFileToString("/proc/filesystems", &filesystems)) return false;
+    return filesystems.find("\t" + filesystem + "\n") != std::string::npos;
+}
+
+std::string fs_mgr_get_context(const std::string& mount_point) {
+    char* ctx = nullptr;
+    if (getfilecon(mount_point.c_str(), &ctx) == -1) {
+        PERROR << "getfilecon " << mount_point;
+        return "";
+    }
+
+    std::string context(ctx);
+    free(ctx);
+    return context;
+}
+
+OverlayfsValidResult fs_mgr_overlayfs_valid() {
+    // Overlayfs available in the kernel, and patched for override_creds?
+    if (access("/sys/module/overlay/parameters/override_creds", F_OK) == 0) {
+        return OverlayfsValidResult::kOverrideCredsRequired;
+    }
+    if (!fs_mgr_filesystem_available("overlay")) {
+        return OverlayfsValidResult::kNotSupported;
+    }
+    struct utsname uts;
+    if (uname(&uts) == -1) {
+        return OverlayfsValidResult::kNotSupported;
+    }
+    int major, minor;
+    if (sscanf(uts.release, "%d.%d", &major, &minor) != 2) {
+        return OverlayfsValidResult::kNotSupported;
+    }
+    if (major < 4) {
+        return OverlayfsValidResult::kOk;
+    }
+    if (major > 4) {
+        return OverlayfsValidResult::kNotSupported;
+    }
+    if (minor > 3) {
+        return OverlayfsValidResult::kNotSupported;
+    }
+    return OverlayfsValidResult::kOk;
+}
diff --git a/fs_mgr/fs_mgr_format.cpp b/fs_mgr/fs_mgr_format.cpp
index 6f59ed3..7385f79 100644
--- a/fs_mgr/fs_mgr_format.cpp
+++ b/fs_mgr/fs_mgr_format.cpp
@@ -117,7 +117,7 @@
 }
 
 static int format_f2fs(const std::string& fs_blkdev, uint64_t dev_sz, bool needs_projid,
-                       bool needs_casefold, bool fs_compress) {
+                       bool needs_casefold, bool fs_compress, const std::string& zoned_device) {
     if (!dev_sz) {
         int rc = get_dev_sz(fs_blkdev, &dev_sz);
         if (rc) {
@@ -146,8 +146,15 @@
         args.push_back("-O");
         args.push_back("extra_attr");
     }
-    args.push_back(fs_blkdev.c_str());
-    args.push_back(size_str.c_str());
+    if (!zoned_device.empty()) {
+        args.push_back("-c");
+        args.push_back(zoned_device.c_str());
+        args.push_back("-m");
+        args.push_back(fs_blkdev.c_str());
+    } else {
+        args.push_back(fs_blkdev.c_str());
+        args.push_back(size_str.c_str());
+    }
 
     return logwrap_fork_execvp(args.size(), args.data(), nullptr, false, LOG_KLOG, false, nullptr);
 }
@@ -164,7 +171,7 @@
 
     if (entry.fs_type == "f2fs") {
         return format_f2fs(entry.blk_device, entry.length, needs_projid, needs_casefold,
-                           entry.fs_mgr_flags.fs_compress);
+                           entry.fs_mgr_flags.fs_compress, entry.zoned_device);
     } else if (entry.fs_type == "ext4") {
         return format_ext4(entry.blk_device, entry.mount_point, needs_projid,
                            entry.fs_mgr_flags.ext_meta_csum);
diff --git a/fs_mgr/fs_mgr_fstab.cpp b/fs_mgr/fs_mgr_fstab.cpp
index 8c719c8..36bd75d 100644
--- a/fs_mgr/fs_mgr_fstab.cpp
+++ b/fs_mgr/fs_mgr_fstab.cpp
@@ -304,6 +304,20 @@
             if (!ParseByteCount(arg, &entry->zram_backingdev_size)) {
                 LWARNING << "Warning: zram_backingdev_size= flag malformed: " << arg;
             }
+        } else if (StartsWith(flag, "zoned_device=")) {
+            std::string zoned;
+            if (ReadFileToString("/sys/class/block/" + arg + "/queue/zoned", &zoned) &&
+                android::base::StartsWith(zoned, "host-managed")) {
+                entry->zoned_device = "/dev/block/" + arg;
+
+                // atgc in f2fs does not support a zoned device
+                auto options = Split(entry->fs_options, ",");
+                options.erase(std::remove(options.begin(), options.end(), "atgc"), options.end());
+                entry->fs_options = android::base::Join(options, ",");
+                LINFO << "Removed ATGC in fs_options as " << entry->fs_options;
+            } else {
+                LWARNING << "Warning: cannot find the zoned device: " << arg;
+            }
         } else {
             LWARNING << "Warning: unknown flag: " << flag;
         }
@@ -431,34 +445,6 @@
     return fstab_result;
 }
 
-// Return the path to the fstab file.  There may be multiple fstab files; the
-// one that is returned will be the first that exists of fstab.<fstab_suffix>,
-// fstab.<hardware>, and fstab.<hardware.platform>.  The fstab is searched for
-// in /odm/etc/ and /vendor/etc/, as well as in the locations where it may be in
-// the first stage ramdisk during early boot.  Previously, the first stage
-// ramdisk's copy of the fstab had to be located in the root directory, but now
-// the system/etc directory is supported too and is the preferred location.
-std::string GetFstabPath() {
-    for (const char* prop : {"fstab_suffix", "hardware", "hardware.platform"}) {
-        std::string suffix;
-
-        if (!fs_mgr_get_boot_config(prop, &suffix)) continue;
-
-        for (const char* prefix : {// late-boot/post-boot locations
-                                   "/odm/etc/fstab.", "/vendor/etc/fstab.",
-                                   // early boot locations
-                                   "/system/etc/fstab.", "/first_stage_ramdisk/system/etc/fstab.",
-                                   "/fstab.", "/first_stage_ramdisk/fstab."}) {
-            std::string fstab_path = prefix + suffix;
-            if (access(fstab_path.c_str(), F_OK) == 0) {
-                return fstab_path;
-            }
-        }
-    }
-
-    return "";
-}
-
 /* Extracts <device>s from the by-name symlinks specified in a fstab:
  *   /dev/block/<type>/<device>/by-name/<partition>
  *
@@ -502,37 +488,58 @@
     return boot_devices;
 }
 
-FstabEntry BuildDsuUserdataFstabEntry() {
-    constexpr uint32_t kFlags = MS_NOATIME | MS_NOSUID | MS_NODEV;
+// Helper class that maps Fstab* -> FstabEntry; const Fstab* -> const FstabEntry.
+template <typename FstabPtr>
+struct FstabPtrEntry {
+    using is_const_fstab = std::is_const<std::remove_pointer_t<FstabPtr>>;
+    using type = std::conditional_t<is_const_fstab::value, const FstabEntry, FstabEntry>;
+};
 
-    FstabEntry userdata = {
-            .blk_device = "userdata_gsi",
-            .mount_point = "/data",
-            .fs_type = "ext4",
-            .flags = kFlags,
-            .reserved_size = 128 * 1024 * 1024,
-    };
-    userdata.fs_mgr_flags.wait = true;
-    userdata.fs_mgr_flags.check = true;
-    userdata.fs_mgr_flags.logical = true;
-    userdata.fs_mgr_flags.quota = true;
-    userdata.fs_mgr_flags.late_mount = true;
-    userdata.fs_mgr_flags.formattable = true;
-    return userdata;
-}
-
-bool EraseFstabEntry(Fstab* fstab, const std::string& mount_point) {
-    auto iter = std::remove_if(fstab->begin(), fstab->end(),
-                               [&](const auto& entry) { return entry.mount_point == mount_point; });
-    if (iter != fstab->end()) {
-        fstab->erase(iter, fstab->end());
-        return true;
+template <typename FstabPtr, typename FstabPtrEntryType = typename FstabPtrEntry<FstabPtr>::type,
+          typename Pred>
+std::vector<FstabPtrEntryType*> GetEntriesByPred(FstabPtr fstab, const Pred& pred) {
+    if (fstab == nullptr) {
+        return {};
     }
-    return false;
+    std::vector<FstabPtrEntryType*> entries;
+    for (FstabPtrEntryType& entry : *fstab) {
+        if (pred(entry)) {
+            entries.push_back(&entry);
+        }
+    }
+    return entries;
 }
 
 }  // namespace
 
+// Return the path to the fstab file.  There may be multiple fstab files; the
+// one that is returned will be the first that exists of fstab.<fstab_suffix>,
+// fstab.<hardware>, and fstab.<hardware.platform>.  The fstab is searched for
+// in /odm/etc/ and /vendor/etc/, as well as in the locations where it may be in
+// the first stage ramdisk during early boot.  Previously, the first stage
+// ramdisk's copy of the fstab had to be located in the root directory, but now
+// the system/etc directory is supported too and is the preferred location.
+std::string GetFstabPath() {
+    for (const char* prop : {"fstab_suffix", "hardware", "hardware.platform"}) {
+        std::string suffix;
+
+        if (!fs_mgr_get_boot_config(prop, &suffix)) continue;
+
+        for (const char* prefix : {// late-boot/post-boot locations
+                                   "/odm/etc/fstab.", "/vendor/etc/fstab.",
+                                   // early boot locations
+                                   "/system/etc/fstab.", "/first_stage_ramdisk/system/etc/fstab.",
+                                   "/fstab.", "/first_stage_ramdisk/fstab."}) {
+            std::string fstab_path = prefix + suffix;
+            if (access(fstab_path.c_str(), F_OK) == 0) {
+                return fstab_path;
+            }
+        }
+    }
+
+    return "";
+}
+
 bool ParseFstabFromString(const std::string& fstab_str, bool proc_mounts, Fstab* fstab_out) {
     const int expected_fields = proc_mounts ? 4 : 5;
 
@@ -591,38 +598,28 @@
 void TransformFstabForDsu(Fstab* fstab, const std::string& dsu_slot,
                           const std::vector<std::string>& dsu_partitions) {
     static constexpr char kDsuKeysDir[] = "/avb";
-    // Convert userdata
-    // Inherit fstab properties for userdata.
-    FstabEntry userdata;
-    if (FstabEntry* entry = GetEntryForMountPoint(fstab, "/data")) {
-        userdata = *entry;
-        userdata.blk_device = android::gsi::kDsuUserdata;
-        userdata.fs_mgr_flags.logical = true;
-        userdata.fs_mgr_flags.formattable = true;
-        if (!userdata.metadata_key_dir.empty()) {
-            userdata.metadata_key_dir = android::gsi::GetDsuMetadataKeyDir(dsu_slot);
-        }
-    } else {
-        userdata = BuildDsuUserdataFstabEntry();
-    }
-
-    if (EraseFstabEntry(fstab, "/data")) {
-        fstab->emplace_back(userdata);
-    }
-
-    // Convert others
     for (auto&& partition : dsu_partitions) {
         if (!EndsWith(partition, gsi::kDsuPostfix)) {
             continue;
         }
-        // userdata has been handled
-        if (partition == android::gsi::kDsuUserdata) {
-            continue;
-        }
         // scratch is handled by fs_mgr_overlayfs
         if (partition == android::gsi::kDsuScratch) {
             continue;
         }
+        // Convert userdata partition.
+        if (partition == android::gsi::kDsuUserdata) {
+            for (auto&& entry : GetEntriesForMountPoint(fstab, "/data")) {
+                entry->blk_device = android::gsi::kDsuUserdata;
+                entry->fs_mgr_flags.logical = true;
+                entry->fs_mgr_flags.formattable = true;
+                if (!entry->metadata_key_dir.empty()) {
+                    entry->metadata_key_dir = android::gsi::GetDsuMetadataKeyDir(dsu_slot);
+                }
+            }
+            continue;
+        }
+        // Convert RO partitions.
+        //
         // dsu_partition_name = corresponding_partition_name + kDsuPostfix
         // e.g.
         //    system_gsi for system
@@ -630,45 +627,51 @@
         //    vendor_gsi for vendor
         std::string lp_name = partition.substr(0, partition.length() - strlen(gsi::kDsuPostfix));
         std::string mount_point = "/" + lp_name;
-        std::vector<FstabEntry*> entries = GetEntriesForMountPoint(fstab, mount_point);
-        if (entries.empty()) {
-            FstabEntry entry = {
-                    .blk_device = partition,
-                    // .logical_partition_name is required to look up AVB Hashtree descriptors.
-                    .logical_partition_name = "system",
-                    .mount_point = mount_point,
-                    .fs_type = "ext4",
-                    .flags = MS_RDONLY,
-                    .fs_options = "barrier=1",
-                    .avb_keys = kDsuKeysDir,
-            };
-            entry.fs_mgr_flags.wait = true;
-            entry.fs_mgr_flags.logical = true;
-            entry.fs_mgr_flags.first_stage_mount = true;
-            fstab->emplace_back(entry);
-        } else {
-            // If the corresponding partition exists, transform all its Fstab
-            // by pointing .blk_device to the DSU partition.
-            for (auto&& entry : entries) {
-                entry->blk_device = partition;
-                // AVB keys for DSU should always be under kDsuKeysDir.
-                entry->avb_keys = kDsuKeysDir;
-                entry->fs_mgr_flags.logical = true;
+
+        // List of fs_type entries we're lacking, need to synthesis these later.
+        std::vector<std::string> lack_fs_list = {"ext4", "erofs"};
+
+        // Only support early mount (first_stage_mount) partitions.
+        auto pred = [&mount_point](const FstabEntry& entry) {
+            return entry.fs_mgr_flags.first_stage_mount && entry.mount_point == mount_point;
+        };
+
+        // Transform all matching entries and assume they are all adjacent for simplicity.
+        for (auto&& entry : GetEntriesByPred(fstab, pred)) {
+            // .blk_device is replaced with the DSU partition.
+            entry->blk_device = partition;
+            // .avb_keys hints first_stage_mount to load the chained-vbmeta image from partition
+            // footer. See aosp/932779 for more details.
+            entry->avb_keys = kDsuKeysDir;
+            // .logical_partition_name is required to look up AVB Hashtree descriptors.
+            entry->logical_partition_name = lp_name;
+            entry->fs_mgr_flags.logical = true;
+            entry->fs_mgr_flags.slot_select = false;
+            entry->fs_mgr_flags.slot_select_other = false;
+
+            if (auto it = std::find(lack_fs_list.begin(), lack_fs_list.end(), entry->fs_type);
+                it != lack_fs_list.end()) {
+                lack_fs_list.erase(it);
             }
-            // Make sure the ext4 is included to support GSI.
-            auto partition_ext4 =
-                    std::find_if(fstab->begin(), fstab->end(), [&](const auto& entry) {
-                        return entry.mount_point == mount_point && entry.fs_type == "ext4";
-                    });
-            if (partition_ext4 == fstab->end()) {
-                auto new_entry = *GetEntryForMountPoint(fstab, mount_point);
-                new_entry.fs_type = "ext4";
-                auto it = std::find_if(fstab->rbegin(), fstab->rend(),
-                                       [&mount_point](const auto& entry) {
-                                           return entry.mount_point == mount_point;
-                                       });
-                auto end_of_mount_point_group = fstab->begin() + std::distance(it, fstab->rend());
-                fstab->insert(end_of_mount_point_group, new_entry);
+        }
+
+        if (!lack_fs_list.empty()) {
+            // Insert at the end of the existing mountpoint group, or at the end of fstab.
+            // We assume there is at most one matching mountpoint group, which is the common case.
+            auto it = std::find_if_not(std::find_if(fstab->begin(), fstab->end(), pred),
+                                       fstab->end(), pred);
+            for (const auto& fs_type : lack_fs_list) {
+                it = std::next(fstab->insert(it, {.blk_device = partition,
+                                                  .logical_partition_name = lp_name,
+                                                  .mount_point = mount_point,
+                                                  .fs_type = fs_type,
+                                                  .flags = MS_RDONLY,
+                                                  .avb_keys = kDsuKeysDir,
+                                                  .fs_mgr_flags{
+                                                          .wait = true,
+                                                          .logical = true,
+                                                          .first_stage_mount = true,
+                                                  }}));
             }
         }
     }
@@ -713,22 +716,13 @@
     }
     if (!is_proc_mounts) {
         if (!access(android::gsi::kGsiBootedIndicatorFile, F_OK)) {
-            // This is expected to fail if host is android Q, since Q doesn't
-            // support DSU slotting. The DSU "active" indicator file would be
-            // non-existent or empty if DSU is enabled within the guest system.
-            // In that case, just use the default slot name "dsu".
             std::string dsu_slot;
-            if (!android::gsi::GetActiveDsu(&dsu_slot) && errno != ENOENT) {
+            if (!android::gsi::GetActiveDsu(&dsu_slot)) {
                 PERROR << __FUNCTION__ << "(): failed to get active DSU slot";
                 return false;
             }
-            if (dsu_slot.empty()) {
-                dsu_slot = "dsu";
-                LWARNING << __FUNCTION__ << "(): assuming default DSU slot: " << dsu_slot;
-            }
-            // This file is non-existent on Q vendor.
             std::string lp_names;
-            if (!ReadFileToString(gsi::kGsiLpNamesFile, &lp_names) && errno != ENOENT) {
+            if (!ReadFileToString(gsi::kGsiLpNamesFile, &lp_names)) {
                 PERROR << __FUNCTION__ << "(): failed to read DSU LP names";
                 return false;
             }
@@ -768,10 +762,11 @@
 }
 
 #ifdef NO_SKIP_MOUNT
-bool SkipMountingPartitions(Fstab*, bool) {
-    return true;
-}
+static constexpr bool kNoSkipMount = true;
 #else
+static constexpr bool kNoSkipMount = false;
+#endif
+
 // For GSI to skip mounting /product and /system_ext, until there are well-defined interfaces
 // between them and /system. Otherwise, the GSI flashed on /system might not be able to work with
 // device-specific /product and /system_ext. skip_mount.cfg belongs to system_ext partition because
@@ -779,17 +774,24 @@
 // /system/system_ext because GSI is a single system.img that includes the contents of system_ext
 // partition and product partition under /system/system_ext and /system/product, respectively.
 bool SkipMountingPartitions(Fstab* fstab, bool verbose) {
-    static constexpr char kSkipMountConfig[] = "/system/system_ext/etc/init/config/skip_mount.cfg";
-
-    std::string skip_config;
-    auto save_errno = errno;
-    if (!ReadFileToString(kSkipMountConfig, &skip_config)) {
-        errno = save_errno;  // missing file is expected
+    if (kNoSkipMount) {
         return true;
     }
 
+    static constexpr char kSkipMountConfig[] = "/system/system_ext/etc/init/config/skip_mount.cfg";
+
+    std::string skip_mount_config;
+    auto save_errno = errno;
+    if (!ReadFileToString(kSkipMountConfig, &skip_mount_config)) {
+        errno = save_errno;  // missing file is expected
+        return true;
+    }
+    return SkipMountWithConfig(skip_mount_config, fstab, verbose);
+}
+
+bool SkipMountWithConfig(const std::string& skip_mount_config, Fstab* fstab, bool verbose) {
     std::vector<std::string> skip_mount_patterns;
-    for (const auto& line : Split(skip_config, "\n")) {
+    for (const auto& line : Split(skip_mount_config, "\n")) {
         if (line.empty() || StartsWith(line, "#")) {
             continue;
         }
@@ -815,7 +817,6 @@
     fstab->erase(remove_from, fstab->end());
     return true;
 }
-#endif
 
 // Loads the fstab file and combines with fstab entries passed in from device tree.
 bool ReadDefaultFstab(Fstab* fstab) {
@@ -824,7 +825,7 @@
 
     std::string default_fstab_path;
     // Use different fstab paths for normal boot and recovery boot, respectively
-    if (access("/system/bin/recovery", F_OK) == 0) {
+    if ((access("/sbin/recovery", F_OK) == 0) || (access("/system/bin/recovery", F_OK) == 0)) {
         default_fstab_path = "/etc/recovery.fstab";
     } else {  // normal boot
         default_fstab_path = GetFstabPath();
@@ -842,33 +843,25 @@
     return !fstab->empty();
 }
 
-FstabEntry* GetEntryForMountPoint(Fstab* fstab, const std::string& path) {
-    if (fstab == nullptr) {
-        return nullptr;
-    }
-
-    for (auto& entry : *fstab) {
-        if (entry.mount_point == path) {
-            return &entry;
-        }
-    }
-
-    return nullptr;
+std::vector<FstabEntry*> GetEntriesForMountPoint(Fstab* fstab, const std::string& path) {
+    return GetEntriesByPred(fstab,
+                            [&path](const FstabEntry& entry) { return entry.mount_point == path; });
 }
 
-std::vector<FstabEntry*> GetEntriesForMountPoint(Fstab* fstab, const std::string& path) {
-    std::vector<FstabEntry*> entries;
-    if (fstab == nullptr) {
-        return entries;
-    }
+std::vector<const FstabEntry*> GetEntriesForMountPoint(const Fstab* fstab,
+                                                       const std::string& path) {
+    return GetEntriesByPred(fstab,
+                            [&path](const FstabEntry& entry) { return entry.mount_point == path; });
+}
 
-    for (auto& entry : *fstab) {
-        if (entry.mount_point == path) {
-            entries.emplace_back(&entry);
-        }
-    }
+FstabEntry* GetEntryForMountPoint(Fstab* fstab, const std::string& path) {
+    std::vector<FstabEntry*> entries = GetEntriesForMountPoint(fstab, path);
+    return entries.empty() ? nullptr : entries.front();
+}
 
-    return entries;
+const FstabEntry* GetEntryForMountPoint(const Fstab* fstab, const std::string& path) {
+    std::vector<const FstabEntry*> entries = GetEntriesForMountPoint(fstab, path);
+    return entries.empty() ? nullptr : entries.front();
 }
 
 std::set<std::string> GetBootDevices() {
diff --git a/fs_mgr/fs_mgr_overlayfs.cpp b/fs_mgr/fs_mgr_overlayfs.cpp
index 82b5275..6349c20 100644
--- a/fs_mgr/fs_mgr_overlayfs.cpp
+++ b/fs_mgr/fs_mgr_overlayfs.cpp
@@ -56,6 +56,7 @@
 #include <storage_literals/storage_literals.h>
 
 #include "fs_mgr_priv.h"
+#include "fs_mgr_priv_overlayfs.h"
 #include "libfiemap/utility.h"
 
 using namespace std::literals;
@@ -67,62 +68,15 @@
 
 namespace {
 
+constexpr char kDataScratchSizeMbProp[] = "fs_mgr.overlayfs.data_scratch_size_mb";
+constexpr char kPreferCacheBackingStorageProp[] = "fs_mgr.overlayfs.prefer_cache_backing_storage";
+
 bool fs_mgr_access(const std::string& path) {
-    auto save_errno = errno;
-    auto ret = access(path.c_str(), F_OK) == 0;
-    errno = save_errno;
-    return ret;
+    return access(path.c_str(), F_OK) == 0;
 }
 
-// determine if a filesystem is available
-bool fs_mgr_overlayfs_filesystem_available(const std::string& filesystem) {
-    std::string filesystems;
-    if (!android::base::ReadFileToString("/proc/filesystems", &filesystems)) return false;
-    return filesystems.find("\t" + filesystem + "\n") != std::string::npos;
-}
-
-}  // namespace
-
-#if ALLOW_ADBD_DISABLE_VERITY == 0  // If we are a user build, provide stubs
-
-Fstab fs_mgr_overlayfs_candidate_list(const Fstab&) {
-    return {};
-}
-
-bool fs_mgr_overlayfs_mount_all(Fstab*) {
-    return false;
-}
-
-bool fs_mgr_overlayfs_setup(const char*, const char*, bool* change, bool) {
-    if (change) *change = false;
-    return false;
-}
-
-bool fs_mgr_overlayfs_teardown(const char*, bool* change) {
-    if (change) *change = false;
-    return false;
-}
-
-bool fs_mgr_overlayfs_is_setup() {
-    return false;
-}
-
-namespace android {
-namespace fs_mgr {
-
-void MapScratchPartitionIfNeeded(Fstab*, const std::function<bool(const std::set<std::string>&)>&) {
-}
-
-void CleanupOldScratchFiles() {}
-
-void TeardownAllOverlayForMountPoint(const std::string&) {}
-
-}  // namespace fs_mgr
-}  // namespace android
-
-#else  // ALLOW_ADBD_DISABLE_VERITY == 0
-
-namespace {
+const auto kLowerdirOption = "lowerdir="s;
+const auto kUpperdirOption = "upperdir="s;
 
 bool fs_mgr_in_recovery() {
     // Check the existence of recovery binary instead of using the compile time
@@ -141,16 +95,17 @@
     // is not well-defined. In this case, just return false as being in recovery
     // implies not running a DSU system.
     if (fs_mgr_in_recovery()) return false;
-    auto saved_errno = errno;
-    auto ret = android::gsi::IsGsiRunning();
-    errno = saved_errno;
-    return ret;
+    return android::gsi::IsGsiRunning();
 }
 
 // list of acceptable overlayfs backing storage
 const auto kScratchMountPoint = "/mnt/scratch"s;
 const auto kCacheMountPoint = "/cache"s;
 
+bool IsABDevice() {
+    return !android::base::GetProperty("ro.boot.slot_suffix", "").empty();
+}
+
 std::vector<const std::string> OverlayMountPoints() {
     // Never fallback to legacy cache mount point if within a DSU system,
     // because running a DSU system implies the device supports dynamic
@@ -158,6 +113,14 @@
     if (fs_mgr_is_dsu_running()) {
         return {kScratchMountPoint};
     }
+
+    // For non-A/B devices prefer cache backing storage if
+    // kPreferCacheBackingStorageProp property set.
+    if (!IsABDevice() && android::base::GetBoolProperty(kPreferCacheBackingStorageProp, false) &&
+        android::base::GetIntProperty("ro.vendor.api_level", -1) < __ANDROID_API_T__) {
+        return {kCacheMountPoint, kScratchMountPoint};
+    }
+
     return {kScratchMountPoint, kCacheMountPoint};
 }
 
@@ -172,13 +135,9 @@
     return !stat(path.c_str(), &st) && S_ISDIR(st.st_mode);
 }
 
-// Similar test as overlayfs workdir= validation in the kernel for read-write
-// validation, except we use fs_mgr_work.  Covers space and storage issues.
-bool fs_mgr_dir_is_writable(const std::string& path) {
-    auto test_directory = path + "/fs_mgr_work";
-    rmdir(test_directory.c_str());
-    auto ret = !mkdir(test_directory.c_str(), 0700);
-    return ret | !rmdir(test_directory.c_str());
+bool fs_mgr_rw_access(const std::string& path) {
+    if (path.empty()) return false;
+    return access(path.c_str(), R_OK | W_OK) == 0;
 }
 
 // At less than 1% or 8MB of free space return value of false,
@@ -187,9 +146,8 @@
     // If we have access issues to find out space remaining, return true
     // to prevent us trying to override with overlayfs.
     struct statvfs vst;
-    auto save_errno = errno;
     if (statvfs(mount_point.c_str(), &vst)) {
-        errno = save_errno;
+        PLOG(ERROR) << "statvfs " << mount_point;
         return true;
     }
 
@@ -235,6 +193,46 @@
     return true;
 }
 
+bool fs_mgr_has_shared_blocks(const std::string& mount_point, const std::string& dev) {
+    struct statfs fs;
+    if ((statfs((mount_point + "/lost+found").c_str(), &fs) == -1) ||
+        (fs.f_type != EXT4_SUPER_MAGIC)) {
+        return false;
+    }
+
+    android::base::unique_fd fd(open(dev.c_str(), O_RDONLY | O_CLOEXEC));
+    if (fd < 0) return false;
+
+    struct ext4_super_block sb;
+    if ((TEMP_FAILURE_RETRY(lseek64(fd, 1024, SEEK_SET)) < 0) ||
+        (TEMP_FAILURE_RETRY(read(fd, &sb, sizeof(sb))) < 0)) {
+        return false;
+    }
+
+    struct fs_info info;
+    if (ext4_parse_sb(&sb, &info) < 0) return false;
+
+    return (info.feat_ro_compat & EXT4_FEATURE_RO_COMPAT_SHARED_BLOCKS) != 0;
+}
+
+#define F2FS_SUPER_OFFSET 1024
+#define F2FS_FEATURE_OFFSET 2180
+#define F2FS_FEATURE_RO 0x4000
+bool fs_mgr_is_read_only_f2fs(const std::string& dev) {
+    if (!fs_mgr_is_f2fs(dev)) return false;
+
+    android::base::unique_fd fd(open(dev.c_str(), O_RDONLY | O_CLOEXEC));
+    if (fd < 0) return false;
+
+    __le32 feat;
+    if ((TEMP_FAILURE_RETRY(lseek64(fd, F2FS_SUPER_OFFSET + F2FS_FEATURE_OFFSET, SEEK_SET)) < 0) ||
+        (TEMP_FAILURE_RETRY(read(fd, &feat, sizeof(feat))) < 0)) {
+        return false;
+    }
+
+    return (feat & cpu_to_le32(F2FS_FEATURE_RO)) != 0;
+}
+
 bool fs_mgr_overlayfs_enabled(FstabEntry* entry) {
     // readonly filesystem, can not be mount -o remount,rw
     // for squashfs, erofs or if free space is (near) zero making such a remount
@@ -249,27 +247,27 @@
         return true;
     }
 
+    // f2fs read-only mode doesn't support remount,rw
+    if (fs_mgr_is_read_only_f2fs(entry->blk_device)) {
+        return true;
+    }
+
     // check if ext4 de-dupe
-    auto save_errno = errno;
     auto has_shared_blocks = fs_mgr_has_shared_blocks(entry->mount_point, entry->blk_device);
     if (!has_shared_blocks && (entry->mount_point == "/system")) {
         has_shared_blocks = fs_mgr_has_shared_blocks("/", entry->blk_device);
     }
-    errno = save_errno;
     return has_shared_blocks;
 }
 
 bool fs_mgr_rm_all(const std::string& path, bool* change = nullptr, int level = 0) {
-    auto save_errno = errno;
     std::unique_ptr<DIR, decltype(&closedir)> dir(opendir(path.c_str()), closedir);
     if (!dir) {
         if (errno == ENOENT) {
-            errno = save_errno;
             return true;
         }
         PERROR << "opendir " << path << " depth=" << level;
         if ((errno == EPERM) && (level != 0)) {
-            errno = save_errno;
             return true;
         }
         return false;
@@ -281,9 +279,7 @@
         auto file = path + "/" + entry->d_name;
         if (entry->d_type == DT_UNKNOWN) {
             struct stat st;
-            save_errno = errno;
             if (!lstat(file.c_str(), &st) && (st.st_mode & S_IFDIR)) entry->d_type = DT_DIR;
-            errno = save_errno;
         }
         if (entry->d_type == DT_DIR) {
             ret &= fs_mgr_rm_all(file, change, level + 1);
@@ -318,15 +314,12 @@
         if (!fs_mgr_is_dir(upper)) continue;
         auto work = dir + kWorkName;
         if (!fs_mgr_is_dir(work)) continue;
-        if (!fs_mgr_dir_is_writable(work)) continue;
+        if (!fs_mgr_rw_access(work)) continue;
         return dir;
     }
     return "";
 }
 
-const auto kLowerdirOption = "lowerdir="s;
-const auto kUpperdirOption = "upperdir="s;
-
 static inline bool KernelSupportsUserXattrs() {
     struct utsname uts;
     uname(&uts);
@@ -338,8 +331,14 @@
     return major > 5 || (major == 5 && minor >= 15);
 }
 
+const std::string fs_mgr_mount_point(const std::string& mount_point) {
+    if ("/"s != mount_point) return mount_point;
+    return "/system";
+}
+
 // default options for mount_point, returns empty string for none available.
-std::string fs_mgr_get_overlayfs_options(const std::string& mount_point) {
+std::string fs_mgr_get_overlayfs_options(const FstabEntry& entry) {
+    const auto mount_point = fs_mgr_mount_point(entry.mount_point);
     auto candidate = fs_mgr_get_overlayfs_candidate(mount_point);
     if (candidate.empty()) return "";
     auto ret = kLowerdirOption + mount_point + "," + kUpperdirOption + candidate + kUpperName +
@@ -350,137 +349,107 @@
     if (KernelSupportsUserXattrs()) {
         ret += ",userxattr";
     }
-    return ret;
-}
-
-const std::string fs_mgr_mount_point(const std::string& mount_point) {
-    if ("/"s != mount_point) return mount_point;
-    return "/system";
-}
-
-bool fs_mgr_rw_access(const std::string& path) {
-    if (path.empty()) return false;
-    auto save_errno = errno;
-    auto ret = access(path.c_str(), R_OK | W_OK) == 0;
-    errno = save_errno;
-    return ret;
-}
-
-bool fs_mgr_overlayfs_already_mounted(const std::string& mount_point, bool overlay_only = true) {
-    Fstab fstab;
-    auto save_errno = errno;
-    if (!ReadFstabFromFile("/proc/mounts", &fstab)) {
-        return false;
-    }
-    errno = save_errno;
-    const auto lowerdir = kLowerdirOption + mount_point;
-    for (const auto& entry : fstab) {
-        if (overlay_only && "overlay" != entry.fs_type && "overlayfs" != entry.fs_type) continue;
-        if (mount_point != entry.mount_point) continue;
-        if (!overlay_only) return true;
-        const auto options = android::base::Split(entry.fs_options, ",");
-        for (const auto& opt : options) {
-            if (opt == lowerdir) {
-                return true;
-            }
+    for (const auto& flag : android::base::Split(entry.fs_options, ",")) {
+        if (android::base::StartsWith(flag, "context=")) {
+            ret += "," + flag;
         }
     }
-    return false;
+    return ret;
 }
 
-bool fs_mgr_wants_overlayfs(FstabEntry* entry) {
-    // Don't check entries that are managed by vold.
-    if (entry->fs_mgr_flags.vold_managed || entry->fs_mgr_flags.recovery_only) return false;
-
-    // *_other doesn't want overlayfs.
-    if (entry->fs_mgr_flags.slot_select_other) return false;
-
-    // Only concerned with readonly partitions.
-    if (!(entry->flags & MS_RDONLY)) return false;
-
-    // If unbindable, do not allow overlayfs as this could expose us to
-    // security issues.  On Android, this could also be used to turn off
-    // the ability to overlay an otherwise acceptable filesystem since
-    // /system and /vendor are never bound(sic) to.
-    if (entry->flags & MS_UNBINDABLE) return false;
-
-    if (!fs_mgr_overlayfs_enabled(entry)) return false;
-
-    return true;
-}
 constexpr char kOverlayfsFileContext[] = "u:object_r:overlayfs_file:s0";
 
-bool fs_mgr_overlayfs_setup_dir(const std::string& dir, std::string* overlay, bool* change) {
-    auto ret = true;
-    auto top = dir + kOverlayTopDir;
-    if (setfscreatecon(kOverlayfsFileContext)) {
-        ret = false;
-        PERROR << "setfscreatecon " << kOverlayfsFileContext;
-    }
-    auto save_errno = errno;
-    if (!mkdir(top.c_str(), 0755)) {
-        if (change) *change = true;
-    } else if (errno != EEXIST) {
-        ret = false;
-        PERROR << "mkdir " << top;
-    } else {
-        errno = save_errno;
-    }
-    setfscreatecon(nullptr);
+class AutoSetFsCreateCon final {
+  public:
+    AutoSetFsCreateCon() {}
+    AutoSetFsCreateCon(const std::string& context) { Set(context); }
+    ~AutoSetFsCreateCon() { Restore(); }
 
-    if (overlay) *overlay = std::move(top);
-    return ret;
+    bool Ok() const { return ok_; }
+    bool Set(const std::string& context) {
+        if (setfscreatecon(context.c_str())) {
+            PLOG(ERROR) << "setfscreatecon " << context;
+            return false;
+        }
+        ok_ = true;
+        return true;
+    }
+    bool Restore() {
+        if (restored_ || !ok_) {
+            return true;
+        }
+        if (setfscreatecon(nullptr)) {
+            PLOG(ERROR) << "setfscreatecon null";
+            return false;
+        }
+        restored_ = true;
+        return true;
+    }
+
+  private:
+    bool ok_ = false;
+    bool restored_ = false;
+};
+
+std::string fs_mgr_overlayfs_setup_dir(const std::string& dir) {
+    auto top = dir + kOverlayTopDir;
+
+    AutoSetFsCreateCon createcon(kOverlayfsFileContext);
+    if (!createcon.Ok()) {
+        return {};
+    }
+    if (mkdir(top.c_str(), 0755) != 0 && errno != EEXIST) {
+        PERROR << "mkdir " << top;
+        return {};
+    }
+    if (!createcon.Restore()) {
+        return {};
+    }
+    return top;
 }
 
 bool fs_mgr_overlayfs_setup_one(const std::string& overlay, const std::string& mount_point,
-                                bool* change) {
-    auto ret = true;
-    if (fs_mgr_overlayfs_already_mounted(mount_point)) return ret;
+                                bool* want_reboot) {
+    if (fs_mgr_overlayfs_already_mounted(mount_point)) {
+        return true;
+    }
     auto fsrec_mount_point = overlay + "/" + android::base::Basename(mount_point) + "/";
 
-    if (setfscreatecon(kOverlayfsFileContext)) {
-        ret = false;
-        PERROR << "setfscreatecon " << kOverlayfsFileContext;
+    AutoSetFsCreateCon createcon(kOverlayfsFileContext);
+    if (!createcon.Ok()) {
+        return false;
     }
-    auto save_errno = errno;
-    if (!mkdir(fsrec_mount_point.c_str(), 0755)) {
-        if (change) *change = true;
-    } else if (errno != EEXIST) {
-        ret = false;
+    if (mkdir(fsrec_mount_point.c_str(), 0755) != 0 && errno != EEXIST) {
         PERROR << "mkdir " << fsrec_mount_point;
-    } else {
-        errno = save_errno;
+        return false;
+    }
+    if (mkdir((fsrec_mount_point + kWorkName).c_str(), 0755) != 0 && errno != EEXIST) {
+        PERROR << "mkdir " << fsrec_mount_point << kWorkName;
+        return false;
+    }
+    if (!createcon.Restore()) {
+        return false;
     }
 
-    save_errno = errno;
-    if (!mkdir((fsrec_mount_point + kWorkName).c_str(), 0755)) {
-        if (change) *change = true;
-    } else if (errno != EEXIST) {
-        ret = false;
-        PERROR << "mkdir " << fsrec_mount_point << kWorkName;
-    } else {
-        errno = save_errno;
-    }
-    setfscreatecon(nullptr);
+    createcon = {};
 
     auto new_context = fs_mgr_get_context(mount_point);
-    if (!new_context.empty() && setfscreatecon(new_context.c_str())) {
-        ret = false;
-        PERROR << "setfscreatecon " << new_context;
+    if (new_context.empty() || !createcon.Set(new_context)) {
+        return false;
     }
-    auto upper = fsrec_mount_point + kUpperName;
-    save_errno = errno;
-    if (!mkdir(upper.c_str(), 0755)) {
-        if (change) *change = true;
-    } else if (errno != EEXIST) {
-        ret = false;
-        PERROR << "mkdir " << upper;
-    } else {
-        errno = save_errno;
-    }
-    if (!new_context.empty()) setfscreatecon(nullptr);
 
-    return ret;
+    auto upper = fsrec_mount_point + kUpperName;
+    if (mkdir(upper.c_str(), 0755) != 0 && errno != EEXIST) {
+        PERROR << "mkdir " << upper;
+        return false;
+    }
+    if (!createcon.Restore()) {
+        return false;
+    }
+
+    if (want_reboot) *want_reboot = true;
+
+    return true;
 }
 
 uint32_t fs_mgr_overlayfs_slot_number() {
@@ -500,30 +469,55 @@
     return false;
 }
 
-void fs_mgr_overlayfs_umount_scratch() {
-    // Lazy umount will allow us to move on and possibly later
-    // establish a new fresh mount without requiring a reboot should
-    // the developer wish to restart.  Old references should melt
-    // away or have no data.  Main goal is to shut the door on the
-    // current overrides with an expectation of a subsequent reboot,
-    // thus any errors here are ignored.
-    umount2(kScratchMountPoint.c_str(), MNT_DETACH);
-    LINFO << "umount(" << kScratchMountPoint << ")";
-    rmdir(kScratchMountPoint.c_str());
+// Returns true if immediate unmount succeeded and the scratch mount point was
+// removed.
+bool fs_mgr_overlayfs_umount_scratch() {
+    if (umount(kScratchMountPoint.c_str()) != 0) {
+        return false;
+    }
+    if (rmdir(kScratchMountPoint.c_str()) != 0 && errno != ENOENT) {
+        PLOG(ERROR) << "rmdir " << kScratchMountPoint;
+    }
+    return true;
 }
 
-bool fs_mgr_overlayfs_teardown_scratch(const std::string& overlay, bool* change) {
+OverlayfsTeardownResult TeardownDataScratch(IImageManager* images,
+                                            const std::string& partition_name, bool was_mounted) {
+    if (!images) {
+        return OverlayfsTeardownResult::Error;
+    }
+    if (!images->DisableImage(partition_name)) {
+        return OverlayfsTeardownResult::Error;
+    }
+    if (was_mounted) {
+        // If overlayfs was mounted, don't bother trying to unmap since
+        // it'll fail and create error spam.
+        return OverlayfsTeardownResult::Busy;
+    }
+    if (!images->UnmapImageIfExists(partition_name)) {
+        return OverlayfsTeardownResult::Busy;
+    }
+    if (!images->DeleteBackingImage(partition_name)) {
+        return OverlayfsTeardownResult::Busy;
+    }
+    return OverlayfsTeardownResult::Ok;
+}
+
+OverlayfsTeardownResult fs_mgr_overlayfs_teardown_scratch(const std::string& overlay,
+                                                          bool* change) {
     // umount and delete kScratchMountPoint storage if we have logical partitions
-    if (overlay != kScratchMountPoint) return true;
+    if (overlay != kScratchMountPoint) {
+        return OverlayfsTeardownResult::Ok;
+    }
 
     // Validation check.
     if (fs_mgr_is_dsu_running()) {
         LERROR << "Destroying DSU scratch is not allowed.";
-        return false;
+        return OverlayfsTeardownResult::Error;
     }
 
-    auto save_errno = errno;
-    if (fs_mgr_overlayfs_already_mounted(kScratchMountPoint, false)) {
+    bool was_mounted = fs_mgr_overlayfs_already_mounted(kScratchMountPoint, false);
+    if (was_mounted) {
         fs_mgr_overlayfs_umount_scratch();
     }
 
@@ -531,42 +525,40 @@
 
     auto images = IImageManager::Open("remount", 10s);
     if (images && images->BackingImageExists(partition_name)) {
-#if defined __ANDROID_RECOVERY__
-        if (!images->DisableImage(partition_name)) {
-            return false;
-        }
-#else
-        if (!images->UnmapImageIfExists(partition_name) ||
-            !images->DeleteBackingImage(partition_name)) {
-            return false;
-        }
-#endif
+        // No need to check super partition, if we knew we had a scratch device
+        // in /data.
+        return TeardownDataScratch(images.get(), partition_name, was_mounted);
     }
 
     auto slot_number = fs_mgr_overlayfs_slot_number();
     auto super_device = fs_mgr_overlayfs_super_device(slot_number);
-    if (!fs_mgr_rw_access(super_device)) return true;
+    if (!fs_mgr_rw_access(super_device)) {
+        return OverlayfsTeardownResult::Ok;
+    }
 
     auto builder = MetadataBuilder::New(super_device, slot_number);
     if (!builder) {
-        errno = save_errno;
-        return true;
+        return OverlayfsTeardownResult::Ok;
     }
     if (builder->FindPartition(partition_name) == nullptr) {
-        errno = save_errno;
-        return true;
+        return OverlayfsTeardownResult::Ok;
     }
     builder->RemovePartition(partition_name);
     auto metadata = builder->Export();
     if (metadata && UpdatePartitionTable(super_device, *metadata.get(), slot_number)) {
         if (change) *change = true;
-        if (!DestroyLogicalPartition(partition_name)) return false;
+        if (!DestroyLogicalPartition(partition_name)) {
+            return OverlayfsTeardownResult::Error;
+        }
     } else {
         LERROR << "delete partition " << overlay;
-        return false;
+        return OverlayfsTeardownResult::Error;
     }
-    errno = save_errno;
-    return true;
+
+    if (was_mounted) {
+        return OverlayfsTeardownResult::Busy;
+    }
+    return OverlayfsTeardownResult::Ok;
 }
 
 bool fs_mgr_overlayfs_teardown_one(const std::string& overlay, const std::string& mount_point,
@@ -584,27 +576,20 @@
     const auto newpath = cleanup_all ? overlay + "/." + kOverlayTopDir.substr(1) + ".teardown"
                                      : top + "/." + partition_name + ".teardown";
     auto ret = fs_mgr_rm_all(newpath);
-    auto save_errno = errno;
     if (!rename(oldpath.c_str(), newpath.c_str())) {
         if (change) *change = true;
     } else if (errno != ENOENT) {
         ret = false;
         PERROR << "mv " << oldpath << " " << newpath;
-    } else {
-        errno = save_errno;
     }
     ret &= fs_mgr_rm_all(newpath, change);
-    save_errno = errno;
     if (!rmdir(newpath.c_str())) {
         if (change) *change = true;
     } else if (errno != ENOENT) {
         ret = false;
         PERROR << "rmdir " << newpath;
-    } else {
-        errno = save_errno;
     }
     if (!cleanup_all) {
-        save_errno = errno;
         if (!rmdir(top.c_str())) {
             if (change) *change = true;
             cleanup_all = true;
@@ -623,10 +608,8 @@
                     }
                 }
             }
-            errno = save_errno;
         } else if (errno == ENOENT) {
             cleanup_all = true;
-            errno = save_errno;
         } else {
             ret = false;
             PERROR << "rmdir " << top;
@@ -642,6 +625,10 @@
     if (ret) {
         PERROR << "__mount(target=" << mount_point
                << ",flag=" << (shared_flag ? "MS_SHARED" : "MS_PRIVATE") << ")=" << ret;
+        // If "/system" doesn't look like a mountpoint, retry with "/".
+        if (errno == EINVAL && mount_point == "/system") {
+            return fs_mgr_overlayfs_set_shared_mount("/", shared_flag);
+        }
         return false;
     }
     return true;
@@ -728,12 +715,12 @@
     return info;
 }
 
-bool fs_mgr_overlayfs_mount(const std::string& mount_point) {
-    auto options = fs_mgr_get_overlayfs_options(mount_point);
+bool fs_mgr_overlayfs_mount(const FstabEntry& entry) {
+    const auto mount_point = fs_mgr_mount_point(entry.mount_point);
+    const auto options = fs_mgr_get_overlayfs_options(entry);
     if (options.empty()) return false;
 
     auto retval = true;
-    auto save_errno = errno;
 
     struct move_entry {
         std::string mount_point;
@@ -763,21 +750,22 @@
         }
 
         // use as the bound directory in /dev.
+        AutoSetFsCreateCon createcon;
         auto new_context = fs_mgr_get_context(entry.mount_point);
-        if (!new_context.empty() && setfscreatecon(new_context.c_str())) {
-            PERROR << "setfscreatecon " << new_context;
+        if (new_context.empty() || !createcon.Set(new_context)) {
+            continue;
         }
         move_entry new_entry = {std::move(entry.mount_point), "/dev/TemporaryDir-XXXXXX",
                                 entry.shared_flag};
         const auto target = mkdtemp(new_entry.dir.data());
+        if (!createcon.Restore()) {
+            return false;
+        }
         if (!target) {
             retval = false;
-            save_errno = errno;
             PERROR << "temporary directory for MS_BIND";
-            setfscreatecon(nullptr);
             continue;
         }
-        setfscreatecon(nullptr);
 
         if (!parent_private && !parent_made_private) {
             parent_made_private = fs_mgr_overlayfs_set_shared_mount(mount_point, false);
@@ -787,7 +775,6 @@
         }
         if (!fs_mgr_overlayfs_move_mount(new_entry.mount_point, new_entry.dir)) {
             retval = false;
-            save_errno = errno;
             if (new_entry.shared_flag) {
                 fs_mgr_overlayfs_set_shared_mount(new_entry.mount_point, true);
             }
@@ -811,7 +798,6 @@
                      options.c_str());
     if (ret) {
         retval = false;
-        save_errno = errno;
         PERROR << report << ret;
     } else {
         LINFO << report << ret;
@@ -825,11 +811,9 @@
 
         if (!fs_mgr_overlayfs_move_mount(entry.dir, entry.mount_point)) {
             retval = false;
-            save_errno = errno;
         } else if (entry.shared_flag &&
                    !fs_mgr_overlayfs_set_shared_mount(entry.mount_point, true)) {
             retval = false;
-            save_errno = errno;
         }
         rmdir(entry.dir.c_str());
     }
@@ -840,50 +824,45 @@
         fs_mgr_overlayfs_set_shared_mount(mount_point, true);
     }
 
-    errno = save_errno;
     return retval;
 }
 
 // Mount kScratchMountPoint
-bool fs_mgr_overlayfs_mount_scratch(const std::string& device_path, const std::string mnt_type,
-                                    bool readonly = false) {
+bool MountScratch(const std::string& device_path, bool readonly = false) {
     if (readonly) {
-        if (!fs_mgr_access(device_path)) return false;
-    } else {
-        if (!fs_mgr_rw_access(device_path)) return false;
+        if (!fs_mgr_access(device_path)) {
+            LOG(ERROR) << "Path does not exist: " << device_path;
+            return false;
+        }
+    } else if (!fs_mgr_rw_access(device_path)) {
+        LOG(ERROR) << "Path does not exist or is not readwrite: " << device_path;
+        return false;
     }
 
-    auto f2fs = fs_mgr_is_f2fs(device_path);
-    auto ext4 = fs_mgr_is_ext4(device_path);
-    if (!f2fs && !ext4) return false;
+    std::vector<const char*> filesystem_candidates;
+    if (fs_mgr_is_f2fs(device_path)) {
+        filesystem_candidates = {"f2fs", "ext4"};
+    } else if (fs_mgr_is_ext4(device_path)) {
+        filesystem_candidates = {"ext4", "f2fs"};
+    } else {
+        LOG(ERROR) << "Scratch partition is not f2fs or ext4";
+        return false;
+    }
 
-    if (setfscreatecon(kOverlayfsFileContext)) {
-        PERROR << "setfscreatecon " << kOverlayfsFileContext;
+    AutoSetFsCreateCon createcon(kOverlayfsFileContext);
+    if (!createcon.Ok()) {
+        return false;
     }
     if (mkdir(kScratchMountPoint.c_str(), 0755) && (errno != EEXIST)) {
         PERROR << "create " << kScratchMountPoint;
+        return false;
     }
 
     FstabEntry entry;
     entry.blk_device = device_path;
     entry.mount_point = kScratchMountPoint;
-    entry.fs_type = mnt_type;
-    if ((mnt_type == "f2fs") && !f2fs) entry.fs_type = "ext4";
-    if ((mnt_type == "ext4") && !ext4) entry.fs_type = "f2fs";
     entry.flags = MS_NOATIME | MS_RDONLY;
-    auto mounted = true;
     if (!readonly) {
-        if (entry.fs_type == "ext4") {
-            // check if ext4 de-dupe
-            entry.flags |= MS_RDONLY;
-            auto save_errno = errno;
-            mounted = fs_mgr_do_mount_one(entry) == 0;
-            if (mounted) {
-                mounted = !fs_mgr_has_shared_blocks(entry.mount_point, entry.blk_device);
-                fs_mgr_overlayfs_umount_scratch();
-            }
-            errno = save_errno;
-        }
         entry.flags &= ~MS_RDONLY;
         entry.flags |= MS_SYNCHRONOUS;
         entry.fs_options = "nodiscard";
@@ -893,60 +872,27 @@
     if (fs_mgr_overlayfs_already_mounted("/data", false)) {
         entry.fs_mgr_flags.check = true;
     }
-    auto save_errno = errno;
-    if (mounted) mounted = fs_mgr_do_mount_one(entry) == 0;
-    if (!mounted) {
-        if ((entry.fs_type == "f2fs") && ext4) {
-            entry.fs_type = "ext4";
-            mounted = fs_mgr_do_mount_one(entry) == 0;
-        } else if ((entry.fs_type == "ext4") && f2fs) {
-            entry.fs_type = "f2fs";
-            mounted = fs_mgr_do_mount_one(entry) == 0;
+    bool mounted = false;
+    for (auto fs_type : filesystem_candidates) {
+        entry.fs_type = fs_type;
+        if (fs_mgr_do_mount_one(entry) == 0) {
+            mounted = true;
+            break;
         }
-        if (!mounted) save_errno = errno;
     }
-    setfscreatecon(nullptr);
-    if (!mounted) rmdir(kScratchMountPoint.c_str());
-    errno = save_errno;
-    return mounted;
+    if (!createcon.Restore()) {
+        return false;
+    }
+    if (!mounted) {
+        rmdir(kScratchMountPoint.c_str());
+        return false;
+    }
+    return true;
 }
 
 const std::string kMkF2fs("/system/bin/make_f2fs");
 const std::string kMkExt4("/system/bin/mke2fs");
 
-// Only a suggestion for _first_ try during mounting
-std::string fs_mgr_overlayfs_scratch_mount_type() {
-    if (!access(kMkF2fs.c_str(), X_OK) && fs_mgr_overlayfs_filesystem_available("f2fs")) {
-        return "f2fs";
-    }
-    if (!access(kMkExt4.c_str(), X_OK) && fs_mgr_overlayfs_filesystem_available("ext4")) {
-        return "ext4";
-    }
-    return "auto";
-}
-
-// Note: we do not check access() here except for the super partition, since
-// in first-stage init we wouldn't have registed by-name symlinks for "other"
-// partitions that won't be mounted.
-static std::string GetPhysicalScratchDevice() {
-    auto slot_number = fs_mgr_overlayfs_slot_number();
-    auto super_device = fs_mgr_overlayfs_super_device(slot_number);
-    auto path = fs_mgr_overlayfs_super_device(slot_number == 0);
-    if (super_device != path) {
-        return path;
-    }
-    if (fs_mgr_access(super_device)) {
-        // Do not try to use system_other on a DAP device.
-        return "";
-    }
-
-    auto other_slot = fs_mgr_get_other_slot_suffix();
-    if (!other_slot.empty()) {
-        return kPhysicalDevice + "system" + other_slot;
-    }
-    return "";
-}
-
 // Note: The scratch partition of DSU is managed by gsid, and should be initialized during
 // first-stage-mount. Just check if the DM device for DSU scratch partition is created or not.
 static std::string GetDsuScratchDevice() {
@@ -983,28 +929,30 @@
         return device;
     }
 
-    // There is no dynamic scratch, so try and find a physical one.
-    return GetPhysicalScratchDevice();
+    return "";
 }
 
-bool fs_mgr_overlayfs_make_scratch(const std::string& scratch_device, const std::string& mnt_type) {
+bool MakeScratchFilesystem(const std::string& scratch_device) {
     // Force mkfs by design for overlay support of adb remount, simplify and
     // thus do not rely on fsck to correct problems that could creep in.
+    auto fs_type = ""s;
     auto command = ""s;
-    if (mnt_type == "f2fs") {
+    if (!access(kMkF2fs.c_str(), X_OK) && fs_mgr_filesystem_available("f2fs")) {
+        fs_type = "f2fs";
         command = kMkF2fs + " -w 4096 -f -d1 -l" + android::base::Basename(kScratchMountPoint);
-    } else if (mnt_type == "ext4") {
+    } else if (!access(kMkExt4.c_str(), X_OK) && fs_mgr_filesystem_available("ext4")) {
+        fs_type = "ext4";
         command = kMkExt4 + " -F -b 4096 -t ext4 -m 0 -O has_journal -M " + kScratchMountPoint;
     } else {
-        errno = ESRCH;
-        LERROR << mnt_type << " has no mkfs cookbook";
+        LERROR << "No supported mkfs command or filesystem driver available, supported filesystems "
+                  "are: f2fs, ext4";
         return false;
     }
     command += " " + scratch_device + " >/dev/null 2>/dev/null </dev/null";
     fs_mgr_set_blk_ro(scratch_device, false);
     auto ret = system(command.c_str());
     if (ret) {
-        LERROR << "make " << mnt_type << " filesystem on " << scratch_device << " return=" << ret;
+        LERROR << "make " << fs_type << " filesystem on " << scratch_device << " return=" << ret;
         return false;
     }
     return true;
@@ -1029,8 +977,7 @@
 }
 
 // Create or update a scratch partition within super.
-static bool CreateDynamicScratch(std::string* scratch_device, bool* partition_exists,
-                                 bool* change) {
+static bool CreateDynamicScratch(std::string* scratch_device, bool* partition_exists) {
     const auto partition_name = android::base::Basename(kScratchMountPoint);
 
     auto& dm = DeviceMapper::Instance();
@@ -1103,8 +1050,6 @@
             LERROR << "add partition " << partition_name;
             return false;
         }
-
-        if (change) *change = true;
     }
 
     if (changed || partition_create) {
@@ -1118,8 +1063,6 @@
         if (!CreateLogicalPartition(params, scratch_device)) {
             return false;
         }
-
-        if (change) *change = true;
     } else if (scratch_device->empty()) {
         *scratch_device = GetBootScratchDevice();
     }
@@ -1140,12 +1083,17 @@
         return 0;
     }
 
-    return std::min(super_info.size, (uint64_t(s.f_frsize) * s.f_bfree) / 2);
+    auto ideal_size = std::min(super_info.size, (uint64_t(s.f_frsize) * s.f_bfree) / 2);
+
+    // Align up to the filesystem block size.
+    if (auto remainder = ideal_size % s.f_bsize; remainder > 0) {
+        ideal_size += s.f_bsize - remainder;
+    }
+    return ideal_size;
 }
 
-static bool CreateScratchOnData(std::string* scratch_device, bool* partition_exists, bool* change) {
+static bool CreateScratchOnData(std::string* scratch_device, bool* partition_exists) {
     *partition_exists = false;
-    if (change) *change = false;
 
     auto images = IImageManager::Open("remount", 10s);
     if (!images) {
@@ -1158,8 +1106,6 @@
         return true;
     }
 
-    if (change) *change = true;
-
     // Note: calling RemoveDisabledImages here ensures that we do not race with
     // clean_scratch_files and accidentally try to map an image that will be
     // deleted.
@@ -1167,7 +1113,10 @@
         return false;
     }
     if (!images->BackingImageExists(partition_name)) {
-        uint64_t size = GetIdealDataScratchSize();
+        auto size = android::base::GetUintProperty<uint64_t>(kDataScratchSizeMbProp, 0) * 1_MiB;
+        if (!size) {
+            size = GetIdealDataScratchSize();
+        }
         if (!size) {
             size = 2_GiB;
         }
@@ -1181,12 +1130,14 @@
     }
     if (!images->MapImageDevice(partition_name, 10s, scratch_device)) {
         LERROR << "could not map scratch image";
+        // If we cannot use this image, then remove it.
+        TeardownDataScratch(images.get(), partition_name, false /* was_mounted */);
         return false;
     }
     return true;
 }
 
-static bool CanUseSuperPartition(const Fstab& fstab, bool* is_virtual_ab) {
+static bool CanUseSuperPartition(const Fstab& fstab) {
     auto slot_number = fs_mgr_overlayfs_slot_number();
     auto super_device = fs_mgr_overlayfs_super_device(slot_number);
     if (!fs_mgr_rw_access(super_device) || !fs_mgr_overlayfs_has_logical(fstab)) {
@@ -1196,87 +1147,147 @@
     if (!metadata) {
         return false;
     }
-    *is_virtual_ab = !!(metadata->header.flags & LP_HEADER_FLAG_VIRTUAL_AB_DEVICE);
     return true;
 }
 
 bool fs_mgr_overlayfs_create_scratch(const Fstab& fstab, std::string* scratch_device,
-                                     bool* partition_exists, bool* change) {
+                                     bool* partition_exists) {
     // Use the DSU scratch device managed by gsid if within a DSU system.
     if (fs_mgr_is_dsu_running()) {
         *scratch_device = GetDsuScratchDevice();
         *partition_exists = !scratch_device->empty();
-        *change = false;
         return *partition_exists;
     }
 
-    // Try a physical partition first.
-    *scratch_device = GetPhysicalScratchDevice();
-    if (!scratch_device->empty() && fs_mgr_rw_access(*scratch_device)) {
-        *partition_exists = true;
-        return true;
-    }
-
-    // If that fails, see if we can land on super.
-    bool is_virtual_ab;
-    if (CanUseSuperPartition(fstab, &is_virtual_ab)) {
-        bool can_use_data = false;
-        if (is_virtual_ab && FilesystemHasReliablePinning("/data", &can_use_data) && can_use_data) {
-            return CreateScratchOnData(scratch_device, partition_exists, change);
+    // Try ImageManager on /data first.
+    bool can_use_data = false;
+    if (FilesystemHasReliablePinning("/data", &can_use_data) && can_use_data) {
+        if (CreateScratchOnData(scratch_device, partition_exists)) {
+            return true;
         }
-        return CreateDynamicScratch(scratch_device, partition_exists, change);
+        LOG(WARNING) << "Failed to allocate scratch on /data, fallback to use free space on super";
     }
-
-    errno = ENXIO;
+    // If that fails, see if we can land on super.
+    if (CanUseSuperPartition(fstab)) {
+        return CreateDynamicScratch(scratch_device, partition_exists);
+    }
     return false;
 }
 
 // Create and mount kScratchMountPoint storage if we have logical partitions
-bool fs_mgr_overlayfs_setup_scratch(const Fstab& fstab, bool* change) {
-    if (fs_mgr_overlayfs_already_mounted(kScratchMountPoint, false)) return true;
+bool fs_mgr_overlayfs_setup_scratch(const Fstab& fstab) {
+    if (fs_mgr_overlayfs_already_mounted(kScratchMountPoint, false)) {
+        return true;
+    }
 
     std::string scratch_device;
     bool partition_exists;
-    if (!fs_mgr_overlayfs_create_scratch(fstab, &scratch_device, &partition_exists, change)) {
+    if (!fs_mgr_overlayfs_create_scratch(fstab, &scratch_device, &partition_exists)) {
+        LOG(ERROR) << "Failed to create scratch partition";
         return false;
     }
 
     // If the partition exists, assume first that it can be mounted.
-    auto mnt_type = fs_mgr_overlayfs_scratch_mount_type();
     if (partition_exists) {
-        if (fs_mgr_overlayfs_mount_scratch(scratch_device, mnt_type)) {
-            if (!fs_mgr_access(kScratchMountPoint + kOverlayTopDir) &&
-                !fs_mgr_filesystem_has_space(kScratchMountPoint)) {
-                // declare it useless, no overrides and no free space
-                fs_mgr_overlayfs_umount_scratch();
-            } else {
-                if (change) *change = true;
+        if (MountScratch(scratch_device)) {
+            if (fs_mgr_access(kScratchMountPoint + kOverlayTopDir) ||
+                fs_mgr_filesystem_has_space(kScratchMountPoint)) {
                 return true;
             }
+            // declare it useless, no overrides and no free space
+            if (!fs_mgr_overlayfs_umount_scratch()) {
+                LOG(ERROR) << "Unable to unmount scratch partition";
+                return false;
+            }
         }
-        // partition existed, but was not initialized; fall through to make it.
-        errno = 0;
     }
 
-    if (!fs_mgr_overlayfs_make_scratch(scratch_device, mnt_type)) return false;
+    if (!MakeScratchFilesystem(scratch_device)) {
+        LOG(ERROR) << "Failed to format scratch partition";
+        return false;
+    }
 
-    if (change) *change = true;
-
-    return fs_mgr_overlayfs_mount_scratch(scratch_device, mnt_type);
+    return MountScratch(scratch_device);
 }
 
-bool fs_mgr_overlayfs_invalid() {
-    if (fs_mgr_overlayfs_valid() == OverlayfsValidResult::kNotSupported) return true;
+#if ALLOW_ADBD_DISABLE_VERITY
+constexpr bool kAllowOverlayfs = true;
+#else
+constexpr bool kAllowOverlayfs = false;
+#endif
 
+// NOTE: OverlayfsSetupAllowed() must be "stricter" than OverlayfsTeardownAllowed().
+// Setup is allowed only if teardown is also allowed.
+bool OverlayfsSetupAllowed(bool verbose = false) {
+    if (!kAllowOverlayfs) {
+        if (verbose) {
+            LOG(ERROR) << "Overlayfs remounts can only be used in debuggable builds";
+        }
+        return false;
+    }
+    // Check mandatory kernel patches.
+    if (fs_mgr_overlayfs_valid() == OverlayfsValidResult::kNotSupported) {
+        if (verbose) {
+            LOG(ERROR) << "Kernel does not support overlayfs";
+        }
+        return false;
+    }
     // in recovery or fastbootd, not allowed!
-    return fs_mgr_in_recovery();
+    if (fs_mgr_in_recovery()) {
+        if (verbose) {
+            LOG(ERROR) << "Unsupported overlayfs setup from recovery";
+        }
+        return false;
+    }
+    return true;
+}
+
+constexpr bool OverlayfsTeardownAllowed() {
+    // Never allow on non-debuggable build.
+    return kAllowOverlayfs;
 }
 
 }  // namespace
 
+bool fs_mgr_wants_overlayfs(FstabEntry* entry) {
+    // Don't check entries that are managed by vold.
+    if (entry->fs_mgr_flags.vold_managed || entry->fs_mgr_flags.recovery_only) return false;
+
+    // *_other doesn't want overlayfs.
+    if (entry->fs_mgr_flags.slot_select_other) return false;
+
+    // Only concerned with readonly partitions.
+    if (!(entry->flags & MS_RDONLY)) return false;
+
+    // If unbindable, do not allow overlayfs as this could expose us to
+    // security issues.  On Android, this could also be used to turn off
+    // the ability to overlay an otherwise acceptable filesystem since
+    // /system and /vendor are never bound(sic) to.
+    if (entry->flags & MS_UNBINDABLE) return false;
+
+    if (!fs_mgr_overlayfs_enabled(entry)) return false;
+
+    return true;
+}
+
 Fstab fs_mgr_overlayfs_candidate_list(const Fstab& fstab) {
+    android::fs_mgr::Fstab mounts;
+    if (!android::fs_mgr::ReadFstabFromFile("/proc/mounts", &mounts)) {
+        PLOG(ERROR) << "Failed to read /proc/mounts";
+        return {};
+    }
+
     Fstab candidates;
     for (const auto& entry : fstab) {
+        // Filter out partitions whose type doesn't match what's mounted.
+        // This avoids spammy behavior on devices which can mount different
+        // filesystems for each partition.
+        auto proc_mount_point = (entry.mount_point == "/system") ? "/" : entry.mount_point;
+        auto mounted = GetEntryForMountPoint(&mounts, proc_mount_point);
+        if (!mounted || mounted->fs_type != entry.fs_type) {
+            continue;
+        }
+
         FstabEntry new_entry = entry;
         if (!fs_mgr_overlayfs_already_mounted(entry.mount_point) &&
             !fs_mgr_wants_overlayfs(&new_entry)) {
@@ -1315,57 +1326,48 @@
     if (!WaitForFile(scratch_device, 10s)) {
         return;
     }
-    const auto mount_type = fs_mgr_overlayfs_scratch_mount_type();
-    if (!fs_mgr_overlayfs_mount_scratch(scratch_device, mount_type, true /* readonly */)) {
+    if (!MountScratch(scratch_device, true /* readonly */)) {
         return;
     }
     auto has_overlayfs_dir = fs_mgr_access(kScratchMountPoint + kOverlayTopDir);
     fs_mgr_overlayfs_umount_scratch();
     if (has_overlayfs_dir) {
-        fs_mgr_overlayfs_mount_scratch(scratch_device, mount_type);
+        MountScratch(scratch_device);
     }
 }
 
 bool fs_mgr_overlayfs_mount_all(Fstab* fstab) {
-    auto ret = false;
-    if (fs_mgr_overlayfs_invalid()) return ret;
-
+    if (!OverlayfsSetupAllowed()) {
+        return false;
+    }
+    auto ret = true;
     auto scratch_can_be_mounted = true;
     for (const auto& entry : fs_mgr_overlayfs_candidate_list(*fstab)) {
         if (fs_mgr_is_verity_enabled(entry)) continue;
         auto mount_point = fs_mgr_mount_point(entry.mount_point);
         if (fs_mgr_overlayfs_already_mounted(mount_point)) {
-            ret = true;
             continue;
         }
         if (scratch_can_be_mounted) {
             scratch_can_be_mounted = false;
             TryMountScratch();
         }
-        if (fs_mgr_overlayfs_mount(mount_point)) ret = true;
+        ret &= fs_mgr_overlayfs_mount(entry);
     }
     return ret;
 }
 
-// Returns false if setup not permitted, errno set to last error.
-// If something is altered, set *change.
-bool fs_mgr_overlayfs_setup(const char* backing, const char* mount_point, bool* change,
-                            bool force) {
-    if (change) *change = false;
-    auto ret = false;
-    if (fs_mgr_overlayfs_valid() == OverlayfsValidResult::kNotSupported) return ret;
-    if (!fs_mgr_boot_completed()) {
-        errno = EBUSY;
-        PERROR << "setup";
-        return ret;
-    }
-
-    auto save_errno = errno;
-    Fstab fstab;
-    if (!ReadDefaultFstab(&fstab)) {
+bool fs_mgr_overlayfs_setup(const Fstab& fstab, const char* mount_point, bool* want_reboot,
+                            bool just_disabled_verity) {
+    if (!OverlayfsSetupAllowed(/*verbose=*/true)) {
         return false;
     }
-    errno = save_errno;
+
+    if (!fs_mgr_boot_completed()) {
+        LOG(ERROR) << "Cannot setup overlayfs before persistent properties are ready";
+        return false;
+    }
+
     auto candidates = fs_mgr_overlayfs_candidate_list(fstab);
     for (auto it = candidates.begin(); it != candidates.end();) {
         if (mount_point &&
@@ -1373,9 +1375,8 @@
             it = candidates.erase(it);
             continue;
         }
-        save_errno = errno;
-        auto verity_enabled = !force && fs_mgr_is_verity_enabled(*it);
-        if (errno == ENOENT || errno == ENXIO) errno = save_errno;
+
+        auto verity_enabled = !just_disabled_verity && fs_mgr_is_verity_enabled(*it);
         if (verity_enabled) {
             it = candidates.erase(it);
             continue;
@@ -1383,13 +1384,20 @@
         ++it;
     }
 
-    if (candidates.empty()) return ret;
+    if (candidates.empty()) {
+        if (mount_point) {
+            LOG(ERROR) << "No overlayfs candidate was found for " << mount_point;
+            return false;
+        }
+        return true;
+    }
 
     std::string dir;
     for (const auto& overlay_mount_point : OverlayMountPoints()) {
-        if (backing && backing[0] && (overlay_mount_point != backing)) continue;
         if (overlay_mount_point == kScratchMountPoint) {
-            if (!fs_mgr_overlayfs_setup_scratch(fstab, change)) continue;
+            if (!fs_mgr_overlayfs_setup_scratch(fstab)) {
+                continue;
+            }
         } else {
             if (GetEntryForMountPoint(&fstab, overlay_mount_point) == nullptr) {
                 continue;
@@ -1399,17 +1407,21 @@
         break;
     }
     if (dir.empty()) {
-        if (change && *change) errno = ESRCH;
-        if (errno == EPERM) errno = save_errno;
-        return ret;
+        LOG(ERROR) << "Could not allocate backing storage for overlays";
+        return false;
     }
 
-    std::string overlay;
-    ret |= fs_mgr_overlayfs_setup_dir(dir, &overlay, change);
-    for (const auto& entry : candidates) {
-        ret |= fs_mgr_overlayfs_setup_one(overlay, fs_mgr_mount_point(entry.mount_point), change);
+    const auto overlay = fs_mgr_overlayfs_setup_dir(dir);
+    if (overlay.empty()) {
+        return false;
     }
-    return ret;
+
+    bool ok = true;
+    for (const auto& entry : candidates) {
+        auto fstab_mount_point = fs_mgr_mount_point(entry.mount_point);
+        ok &= fs_mgr_overlayfs_setup_one(overlay, fstab_mount_point, want_reboot);
+    }
+    return ok;
 }
 
 struct MapInfo {
@@ -1511,59 +1523,72 @@
     return true;
 }
 
-// Returns false if teardown not permitted, errno set to last error.
-// If something is altered, set *change.
-bool fs_mgr_overlayfs_teardown(const char* mount_point, bool* change) {
-    if (change) *change = false;
-    auto ret = true;
+static OverlayfsTeardownResult TeardownMountsAndScratch(const char* mount_point,
+                                                        bool* want_reboot) {
+    bool should_destroy_scratch = false;
+    auto rv = OverlayfsTeardownResult::Ok;
+    for (const auto& overlay_mount_point : OverlayMountPoints()) {
+        auto ok = fs_mgr_overlayfs_teardown_one(
+                overlay_mount_point, mount_point ? fs_mgr_mount_point(mount_point) : "",
+                want_reboot,
+                overlay_mount_point == kScratchMountPoint ? &should_destroy_scratch : nullptr);
+        if (!ok) {
+            rv = OverlayfsTeardownResult::Error;
+        }
+    }
 
+    // Do not attempt to destroy DSU scratch if within a DSU system,
+    // because DSU scratch partition is managed by gsid.
+    if (should_destroy_scratch && !fs_mgr_is_dsu_running()) {
+        auto rv = fs_mgr_overlayfs_teardown_scratch(kScratchMountPoint, want_reboot);
+        if (rv != OverlayfsTeardownResult::Ok) {
+            return rv;
+        }
+    }
+    // And now that we did what we could, lets inform
+    // caller that there may still be more to do.
+    if (!fs_mgr_boot_completed()) {
+        LOG(ERROR) << "Cannot teardown overlayfs before persistent properties are ready";
+        return OverlayfsTeardownResult::Error;
+    }
+    return rv;
+}
+
+// Returns false if teardown not permitted. If something is altered, set *want_reboot.
+OverlayfsTeardownResult fs_mgr_overlayfs_teardown(const char* mount_point, bool* want_reboot) {
+    if (!OverlayfsTeardownAllowed()) {
+        // Nothing to teardown.
+        return OverlayfsTeardownResult::Ok;
+    }
     // If scratch exists, but is not mounted, lets gain access to clean
     // specific override entries.
     auto mount_scratch = false;
     if ((mount_point != nullptr) && !fs_mgr_overlayfs_already_mounted(kScratchMountPoint, false)) {
         std::string scratch_device = GetBootScratchDevice();
         if (!scratch_device.empty()) {
-            mount_scratch = fs_mgr_overlayfs_mount_scratch(scratch_device,
-                                                           fs_mgr_overlayfs_scratch_mount_type());
+            mount_scratch = MountScratch(scratch_device);
         }
     }
-    bool should_destroy_scratch = false;
-    for (const auto& overlay_mount_point : OverlayMountPoints()) {
-        ret &= fs_mgr_overlayfs_teardown_one(
-                overlay_mount_point, mount_point ? fs_mgr_mount_point(mount_point) : "", change,
-                overlay_mount_point == kScratchMountPoint ? &should_destroy_scratch : nullptr);
-    }
-    // Do not attempt to destroy DSU scratch if within a DSU system,
-    // because DSU scratch partition is managed by gsid.
-    if (should_destroy_scratch && !fs_mgr_is_dsu_running()) {
-        ret &= fs_mgr_overlayfs_teardown_scratch(kScratchMountPoint, change);
-    }
-    if (fs_mgr_overlayfs_valid() == OverlayfsValidResult::kNotSupported) {
-        // After obligatory teardown to make sure everything is clean, but if
-        // we didn't want overlayfs in the first place, we do not want to
-        // waste time on a reboot (or reboot request message).
-        if (change) *change = false;
-    }
-    // And now that we did what we could, lets inform
-    // caller that there may still be more to do.
-    if (!fs_mgr_boot_completed()) {
-        errno = EBUSY;
-        PERROR << "teardown";
-        ret = false;
-    }
+
+    auto rv = TeardownMountsAndScratch(mount_point, want_reboot);
+
     if (mount_scratch) {
-        fs_mgr_overlayfs_umount_scratch();
+        if (!fs_mgr_overlayfs_umount_scratch()) {
+            return OverlayfsTeardownResult::Busy;
+        }
     }
-    return ret;
+    return rv;
 }
 
 bool fs_mgr_overlayfs_is_setup() {
+    if (!OverlayfsSetupAllowed()) {
+        return false;
+    }
     if (fs_mgr_overlayfs_already_mounted(kScratchMountPoint, false)) return true;
     Fstab fstab;
     if (!ReadDefaultFstab(&fstab)) {
         return false;
     }
-    if (fs_mgr_overlayfs_invalid()) return false;
     for (const auto& entry : fs_mgr_overlayfs_candidate_list(fstab)) {
         if (fs_mgr_is_verity_enabled(entry)) continue;
         if (fs_mgr_overlayfs_already_mounted(fs_mgr_mount_point(entry.mount_point))) return true;
@@ -1576,7 +1601,7 @@
 
 void MapScratchPartitionIfNeeded(Fstab* fstab,
                                  const std::function<bool(const std::set<std::string>&)>& init) {
-    if (fs_mgr_overlayfs_invalid()) {
+    if (!OverlayfsSetupAllowed()) {
         return;
     }
     if (GetEntryForMountPoint(fstab, kScratchMountPoint) != nullptr) {
@@ -1613,6 +1638,9 @@
 }
 
 void CleanupOldScratchFiles() {
+    if (!OverlayfsTeardownAllowed()) {
+        return;
+    }
     if (!ScratchIsOnData()) {
         return;
     }
@@ -1622,6 +1650,9 @@
 }
 
 void TeardownAllOverlayForMountPoint(const std::string& mount_point) {
+    if (!OverlayfsTeardownAllowed()) {
+        return;
+    }
     if (!fs_mgr_in_recovery()) {
         LERROR << __FUNCTION__ << "(): must be called within recovery.";
         return;
@@ -1652,10 +1683,11 @@
         }
     }
 
+    // Note if we just disabled scratch, this mount will fail.
     if (auto info = EnsureScratchMapped(); info.has_value()) {
         // Map scratch device, mount kScratchMountPoint and teardown kScratchMountPoint.
         fs_mgr_overlayfs_umount_scratch();
-        if (fs_mgr_overlayfs_mount_scratch(info->device, fs_mgr_overlayfs_scratch_mount_type())) {
+        if (MountScratch(info->device)) {
             bool should_destroy_scratch = false;
             fs_mgr_overlayfs_teardown_one(kScratchMountPoint, teardown_dir, ignore_change,
                                           &should_destroy_scratch);
@@ -1670,7 +1702,7 @@
     std::string scratch_device;
     if (MapDsuScratchDevice(&scratch_device)) {
         fs_mgr_overlayfs_umount_scratch();
-        if (fs_mgr_overlayfs_mount_scratch(scratch_device, fs_mgr_overlayfs_scratch_mount_type())) {
+        if (MountScratch(scratch_device)) {
             fs_mgr_overlayfs_teardown_one(kScratchMountPoint, teardown_dir, ignore_change);
             fs_mgr_overlayfs_umount_scratch();
         }
@@ -1681,65 +1713,22 @@
 }  // namespace fs_mgr
 }  // namespace android
 
-#endif  // ALLOW_ADBD_DISABLE_VERITY != 0
-
-bool fs_mgr_has_shared_blocks(const std::string& mount_point, const std::string& dev) {
-    struct statfs fs;
-    if ((statfs((mount_point + "/lost+found").c_str(), &fs) == -1) ||
-        (fs.f_type != EXT4_SUPER_MAGIC)) {
+bool fs_mgr_overlayfs_already_mounted(const std::string& mount_point, bool overlay_only) {
+    Fstab fstab;
+    if (!ReadFstabFromFile("/proc/mounts", &fstab)) {
         return false;
     }
-
-    android::base::unique_fd fd(open(dev.c_str(), O_RDONLY | O_CLOEXEC));
-    if (fd < 0) return false;
-
-    struct ext4_super_block sb;
-    if ((TEMP_FAILURE_RETRY(lseek64(fd, 1024, SEEK_SET)) < 0) ||
-        (TEMP_FAILURE_RETRY(read(fd, &sb, sizeof(sb))) < 0)) {
-        return false;
+    const auto lowerdir = kLowerdirOption + mount_point;
+    for (const auto& entry : fstab) {
+        if (overlay_only && "overlay" != entry.fs_type && "overlayfs" != entry.fs_type) continue;
+        if (mount_point != entry.mount_point) continue;
+        if (!overlay_only) return true;
+        const auto options = android::base::Split(entry.fs_options, ",");
+        for (const auto& opt : options) {
+            if (opt == lowerdir) {
+                return true;
+            }
+        }
     }
-
-    struct fs_info info;
-    if (ext4_parse_sb(&sb, &info) < 0) return false;
-
-    return (info.feat_ro_compat & EXT4_FEATURE_RO_COMPAT_SHARED_BLOCKS) != 0;
-}
-
-std::string fs_mgr_get_context(const std::string& mount_point) {
-    char* ctx = nullptr;
-    if (getfilecon(mount_point.c_str(), &ctx) == -1) {
-        return "";
-    }
-
-    std::string context(ctx);
-    free(ctx);
-    return context;
-}
-
-OverlayfsValidResult fs_mgr_overlayfs_valid() {
-    // Overlayfs available in the kernel, and patched for override_creds?
-    if (fs_mgr_access("/sys/module/overlay/parameters/override_creds")) {
-        return OverlayfsValidResult::kOverrideCredsRequired;
-    }
-    if (!fs_mgr_overlayfs_filesystem_available("overlay")) {
-        return OverlayfsValidResult::kNotSupported;
-    }
-    struct utsname uts;
-    if (uname(&uts) == -1) {
-        return OverlayfsValidResult::kNotSupported;
-    }
-    int major, minor;
-    if (sscanf(uts.release, "%d.%d", &major, &minor) != 2) {
-        return OverlayfsValidResult::kNotSupported;
-    }
-    if (major < 4) {
-        return OverlayfsValidResult::kOk;
-    }
-    if (major > 4) {
-        return OverlayfsValidResult::kNotSupported;
-    }
-    if (minor > 3) {
-        return OverlayfsValidResult::kNotSupported;
-    }
-    return OverlayfsValidResult::kOk;
+    return false;
 }
diff --git a/fs_mgr/fs_mgr_priv.h b/fs_mgr/fs_mgr_priv.h
index c5e477c..46f54cc 100644
--- a/fs_mgr/fs_mgr_priv.h
+++ b/fs_mgr/fs_mgr_priv.h
@@ -99,6 +99,16 @@
 
 bool fs_mgr_teardown_verity(android::fs_mgr::FstabEntry* fstab);
 
+bool fs_mgr_filesystem_available(const std::string& filesystem);
+std::string fs_mgr_get_context(const std::string& mount_point);
+
+enum class OverlayfsValidResult {
+    kNotSupported = 0,
+    kOk,
+    kOverrideCredsRequired,
+};
+OverlayfsValidResult fs_mgr_overlayfs_valid();
+
 namespace android {
 namespace fs_mgr {
 bool UnmapDevice(const std::string& name);
diff --git a/fs_mgr/fs_mgr_priv_overlayfs.h b/fs_mgr/fs_mgr_priv_overlayfs.h
new file mode 100644
index 0000000..2033701
--- /dev/null
+++ b/fs_mgr/fs_mgr_priv_overlayfs.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <string>
+
+#include <fstab/fstab.h>
+
+bool fs_mgr_overlayfs_already_mounted(const std::string& mount_point, bool overlay_only = true);
+bool fs_mgr_wants_overlayfs(android::fs_mgr::FstabEntry* entry);
+android::fs_mgr::Fstab fs_mgr_overlayfs_candidate_list(const android::fs_mgr::Fstab& fstab);
+
+// If "mount_point" is non-null, set up exactly one overlay.
+// If "mount_point" is null, setup any overlays.
+//
+// If |want_reboot| is non-null, and a reboot is needed to apply overlays, then
+// it will be true on return. The caller is responsible for initializing it.
+bool fs_mgr_overlayfs_setup(const android::fs_mgr::Fstab& fstab, const char* mount_point = nullptr,
+                            bool* want_reboot = nullptr, bool just_disabled_verity = true);
+
+enum class OverlayfsTeardownResult {
+    Ok,
+    Busy,  // Indicates that overlays are still in use.
+    Error
+};
+OverlayfsTeardownResult fs_mgr_overlayfs_teardown(const char* mount_point = nullptr,
+                                                  bool* want_reboot = nullptr);
+
+namespace android {
+namespace fs_mgr {
+
+void CleanupOldScratchFiles();
+
+}  // namespace fs_mgr
+}  // namespace android
diff --git a/fs_mgr/fs_mgr_remount.cpp b/fs_mgr/fs_mgr_remount.cpp
index deaf5f7..5fddf86 100644
--- a/fs_mgr/fs_mgr_remount.cpp
+++ b/fs_mgr/fs_mgr_remount.cpp
@@ -22,6 +22,7 @@
 #include <sys/vfs.h>
 #include <unistd.h>
 
+#include <iostream>
 #include <string>
 #include <thread>
 #include <utility>
@@ -33,42 +34,52 @@
 #include <android-base/strings.h>
 #include <android/os/IVold.h>
 #include <binder/IServiceManager.h>
+#include <binder/ProcessState.h>
 #include <bootloader_message/bootloader_message.h>
 #include <cutils/android_reboot.h>
-#include <fec/io.h>
 #include <fs_mgr_overlayfs.h>
 #include <fs_mgr_priv.h>
 #include <fstab/fstab.h>
 #include <libavb_user/libavb_user.h>
 #include <libgsi/libgsid.h>
 
+#include "fs_mgr_priv_overlayfs.h"
+
 using namespace std::literals;
+using android::fs_mgr::Fstab;
+using android::fs_mgr::FstabEntry;
 
 namespace {
 
-[[noreturn]] void usage(int exit_status) {
-    LOG(INFO) << getprogname()
-              << " [-h] [-R] [-T fstab_file] [partition]...\n"
-                 "\t-h --help\tthis help\n"
-                 "\t-R --reboot\tdisable verity & reboot to facilitate remount\n"
-                 "\t-T --fstab\tcustom fstab file location\n"
-                 "\tpartition\tspecific partition(s) (empty does all)\n"
-                 "\n"
-                 "Remount specified partition(s) read-write, by name or mount point.\n"
-                 "-R notwithstanding, verity must be disabled on partition(s).\n"
-                 "-R within a DSU guest system reboots into the DSU instead of the host system,\n"
-                 "this command would enable DSU (one-shot) if not already enabled.";
+void usage() {
+    const std::string progname = getprogname();
+    if (progname == "disable-verity" || progname == "enable-verity" ||
+        progname == "set-verity-state") {
+        std::cout << "Usage: disable-verity\n"
+                  << "       enable-verity\n"
+                  << "       set-verity-state [0|1]\n"
+                  << R"(
+Options:
+    -h --help       this help
+    -R --reboot     automatic reboot if needed for new settings to take effect
+    -v --verbose    be noisy)"
+                  << std::endl;
+    } else {
+        std::cout << "Usage: " << progname << " [-h] [-R] [-T fstab_file] [partition]...\n"
+                  << R"(
+Options:
+    -h --help       this help
+    -R --reboot     disable verity & reboot to facilitate remount
+    -v --verbose    be noisy
+    -T --fstab      custom fstab file location
+    partition       specific partition(s) (empty does all)
 
-    ::exit(exit_status);
-}
-
-bool remountable_partition(const android::fs_mgr::FstabEntry& entry) {
-    if (entry.fs_mgr_flags.vold_managed) return false;
-    if (entry.fs_mgr_flags.recovery_only) return false;
-    if (entry.fs_mgr_flags.slot_select_other) return false;
-    if (!(entry.flags & MS_RDONLY)) return false;
-    if (entry.fs_type == "vfat") return false;
-    return true;
+Remount specified partition(s) read-write, by name or mount point.
+-R notwithstanding, verity must be disabled on partition(s).
+-R within a DSU guest system reboots into the DSU instead of the host system,
+this command would enable DSU (one-shot) if not already enabled.)"
+                  << std::endl;
+    }
 }
 
 const std::string system_mount_point(const android::fs_mgr::FstabEntry& entry) {
@@ -76,8 +87,7 @@
     return entry.mount_point;
 }
 
-const android::fs_mgr::FstabEntry* is_wrapped(const android::fs_mgr::Fstab& overlayfs_candidates,
-                                              const android::fs_mgr::FstabEntry& entry) {
+const FstabEntry* GetWrappedEntry(const Fstab& overlayfs_candidates, const FstabEntry& entry) {
     auto mount_point = system_mount_point(entry);
     auto it = std::find_if(overlayfs_candidates.begin(), overlayfs_candidates.end(),
                            [&mount_point](const auto& entry) {
@@ -88,27 +98,32 @@
     return &(*it);
 }
 
-auto verbose = false;
+class MyLogger {
+  public:
+    explicit MyLogger(bool verbose) : verbose_(verbose) {}
 
-void MyLogger(android::base::LogId id, android::base::LogSeverity severity, const char* tag,
-              const char* file, unsigned int line, const char* message) {
-    if (verbose || severity == android::base::ERROR || message[0] != '[') {
-        fprintf(stderr, "%s\n", message);
+    void operator()(android::base::LogId id, android::base::LogSeverity severity, const char* tag,
+                    const char* file, unsigned int line, const char* message) {
+        // By default, print ERROR logs and logs of this program (does not start with '[')
+        // Print [libfs_mgr] INFO logs only if -v is given.
+        if (verbose_ || severity >= android::base::ERROR || message[0] != '[') {
+            fprintf(stderr, "%s\n", message);
+        }
+        logd_(id, severity, tag, file, line, message);
     }
-    static auto logd = android::base::LogdLogger();
-    logd(id, severity, tag, file, line, message);
-}
 
-[[noreturn]] void reboot(bool overlayfs = false) {
-    if (overlayfs) {
-        LOG(INFO) << "Successfully setup overlayfs\nrebooting device";
-    } else {
-        LOG(INFO) << "Successfully disabled verity\nrebooting device";
-    }
+  private:
+    android::base::LogdLogger logd_;
+    bool verbose_;
+};
+
+[[noreturn]] void reboot(const std::string& name) {
+    LOG(INFO) << "Rebooting device for new settings to take effect";
     ::sync();
-    android::base::SetProperty(ANDROID_RB_PROPERTY, "reboot,remount");
+    android::base::SetProperty(ANDROID_RB_PROPERTY, "reboot," + name);
     ::sleep(60);
-    ::exit(0);  // SUCCESS
+    LOG(ERROR) << "Failed to reboot";
+    ::exit(1);
 }
 
 static android::sp<android::os::IVold> GetVold() {
@@ -124,384 +139,564 @@
     }
 }
 
-}  // namespace
+static bool ReadFstab(const char* fstab_file, android::fs_mgr::Fstab* fstab) {
+    if (fstab_file) {
+        return android::fs_mgr::ReadFstabFromFile(fstab_file, fstab);
+    }
+    if (!android::fs_mgr::ReadDefaultFstab(fstab)) {
+        return false;
+    }
 
-using namespace std::chrono_literals;
+    // Manufacture a / entry from /proc/mounts if missing.
+    if (!GetEntryForMountPoint(fstab, "/system") && !GetEntryForMountPoint(fstab, "/")) {
+        android::fs_mgr::Fstab mounts;
+        if (android::fs_mgr::ReadFstabFromFile("/proc/mounts", &mounts)) {
+            if (auto entry = GetEntryForMountPoint(&mounts, "/")) {
+                if (entry->fs_type != "rootfs") fstab->emplace_back(*entry);
+            }
+        }
+    }
+    return true;
+}
 
-enum RemountStatus {
-    REMOUNT_SUCCESS = 0,
-    NOT_USERDEBUG,
-    BADARG,
-    NOT_ROOT,
-    NO_FSTAB,
-    UNKNOWN_PARTITION,
-    INVALID_PARTITION,
-    VERITY_PARTITION,
-    BAD_OVERLAY,
-    NO_MOUNTS,
-    REMOUNT_FAILED,
-    MUST_REBOOT,
-    BINDER_ERROR,
-    CHECKPOINTING,
-    GSID_ERROR,
-    CLEAN_SCRATCH_FILES,
+bool VerifyCheckpointing() {
+    if (!android::base::GetBoolProperty("ro.virtual_ab.enabled", false) &&
+        !android::base::GetBoolProperty("ro.virtual_ab.retrofit", false)) {
+        return true;
+    }
+
+    // Virtual A/B devices can use /data as backing storage; make sure we're
+    // not checkpointing.
+    auto vold = GetVold();
+    bool checkpointing = false;
+    if (!vold->isCheckpointing(&checkpointing).isOk()) {
+        LOG(ERROR) << "Could not determine checkpointing status.";
+        return false;
+    }
+    if (checkpointing) {
+        LOG(ERROR) << "Cannot use remount when a checkpoint is in progress.";
+        return false;
+    }
+    return true;
+}
+
+static bool IsRemountable(Fstab& candidates, const FstabEntry& entry) {
+    if (entry.fs_mgr_flags.vold_managed || entry.fs_mgr_flags.recovery_only ||
+        entry.fs_mgr_flags.slot_select_other) {
+        return false;
+    }
+    if (!(entry.flags & MS_RDONLY)) {
+        return false;
+    }
+    if (entry.fs_type == "vfat") {
+        return false;
+    }
+    if (auto candidate_entry = GetEntryForMountPoint(&candidates, entry.mount_point)) {
+        return candidate_entry->fs_type == entry.fs_type;
+    }
+    if (GetWrappedEntry(candidates, entry)) {
+        return false;
+    }
+    return true;
+}
+
+static Fstab::const_iterator FindPartition(const Fstab& fstab, const std::string& partition) {
+    Fstab mounts;
+    if (!android::fs_mgr::ReadFstabFromFile("/proc/mounts", &mounts)) {
+        LOG(ERROR) << "Failed to read /proc/mounts";
+        return fstab.end();
+    }
+
+    for (auto iter = fstab.begin(); iter != fstab.end(); iter++) {
+        const auto mount_point = system_mount_point(*iter);
+        if (partition == mount_point || partition == android::base::Basename(mount_point)) {
+            // In case fstab has multiple entries, pick the one that matches the
+            // actual mounted filesystem type.
+            auto proc_mount_point = (iter->mount_point == "/system") ? "/" : iter->mount_point;
+            auto mounted = GetEntryForMountPoint(&mounts, proc_mount_point);
+            if (mounted && mounted->fs_type == iter->fs_type) {
+                return iter;
+            }
+        }
+    }
+    return fstab.end();
+}
+
+static Fstab GetAllRemountablePartitions(Fstab& fstab) {
+    auto candidates = fs_mgr_overlayfs_candidate_list(fstab);
+
+    Fstab partitions;
+    for (const auto& entry : fstab) {
+        if (IsRemountable(candidates, entry)) {
+            partitions.emplace_back(entry);
+        }
+    }
+    return partitions;
+}
+
+bool GetRemountList(const Fstab& fstab, const std::vector<std::string>& argv, Fstab* partitions) {
+    auto candidates = fs_mgr_overlayfs_candidate_list(fstab);
+
+    for (const auto& arg : argv) {
+        std::string partition = arg;
+        if (partition == "/") {
+            partition = "/system";
+        }
+
+        auto it = FindPartition(fstab, partition);
+        if (it == fstab.end()) {
+            LOG(ERROR) << "Unknown partition " << arg;
+            return false;
+        }
+
+        const FstabEntry* entry = &*it;
+        if (auto wrap = GetWrappedEntry(candidates, *entry); wrap != nullptr) {
+            LOG(INFO) << "partition " << arg << " covered by overlayfs for " << wrap->mount_point
+                      << ", switching";
+            entry = wrap;
+        }
+
+        // If it's already remounted, include it so it gets gracefully skipped
+        // later on.
+        if (!fs_mgr_overlayfs_already_mounted(entry->mount_point) &&
+            !IsRemountable(candidates, *entry)) {
+            LOG(ERROR) << "Invalid partition " << arg;
+            return false;
+        }
+        if (GetEntryForMountPoint(partitions, entry->mount_point) != nullptr) {
+            continue;
+        }
+        partitions->emplace_back(*entry);
+    }
+
+    return true;
+}
+
+struct RemountCheckResult {
+    bool reboot_later = false;
+    bool setup_overlayfs = false;
+    bool disabled_verity = false;
+    bool verity_error = false;
+    bool remounted_anything = false;
 };
 
-static int do_remount(int argc, char* argv[]) {
-    RemountStatus retval = REMOUNT_SUCCESS;
-
-    // If somehow this executable is delivered on a "user" build, it can
-    // not function, so providing a clear message to the caller rather than
-    // letting if fall through and provide a lot of confusing failure messages.
-    if (!ALLOW_ADBD_DISABLE_VERITY || (android::base::GetProperty("ro.debuggable", "0") != "1")) {
-        LOG(ERROR) << "only functions on userdebug or eng builds";
-        return NOT_USERDEBUG;
-    }
-
-    const char* fstab_file = nullptr;
-    auto can_reboot = false;
-
-    struct option longopts[] = {
-            {"fstab", required_argument, nullptr, 'T'},
-            {"help", no_argument, nullptr, 'h'},
-            {"reboot", no_argument, nullptr, 'R'},
-            {"verbose", no_argument, nullptr, 'v'},
-            {"clean_scratch_files", no_argument, nullptr, 'C'},
-            {0, 0, nullptr, 0},
-    };
-    for (int opt; (opt = ::getopt_long(argc, argv, "hRT:v", longopts, nullptr)) != -1;) {
-        switch (opt) {
-            case 'h':
-                usage(SUCCESS);
-                break;
-            case 'R':
-                can_reboot = true;
-                break;
-            case 'T':
-                if (fstab_file) {
-                    LOG(ERROR) << "Cannot supply two fstabs: -T " << fstab_file << " -T" << optarg;
-                    usage(BADARG);
-                }
-                fstab_file = optarg;
-                break;
-            case 'v':
-                verbose = true;
-                break;
-            case 'C':
-                return CLEAN_SCRATCH_FILES;
-            default:
-                LOG(ERROR) << "Bad Argument -" << char(opt);
-                usage(BADARG);
-                break;
-        }
-    }
-
-    // Make sure we are root.
-    if (::getuid() != 0) {
-        LOG(ERROR) << "Not running as root. Try \"adb root\" first.";
-        return NOT_ROOT;
-    }
-
-    // Read the selected fstab.
-    android::fs_mgr::Fstab fstab;
-    auto fstab_read = false;
-    if (fstab_file) {
-        fstab_read = android::fs_mgr::ReadFstabFromFile(fstab_file, &fstab);
-    } else {
-        fstab_read = android::fs_mgr::ReadDefaultFstab(&fstab);
-        // Manufacture a / entry from /proc/mounts if missing.
-        if (!GetEntryForMountPoint(&fstab, "/system") && !GetEntryForMountPoint(&fstab, "/")) {
-            android::fs_mgr::Fstab mounts;
-            if (android::fs_mgr::ReadFstabFromFile("/proc/mounts", &mounts)) {
-                if (auto entry = GetEntryForMountPoint(&mounts, "/")) {
-                    if (entry->fs_type != "rootfs") fstab.emplace_back(*entry);
-                }
-            }
-        }
-    }
-    if (!fstab_read || fstab.empty()) {
-        PLOG(ERROR) << "Failed to read fstab";
-        return NO_FSTAB;
-    }
-
-    if (android::base::GetBoolProperty("ro.virtual_ab.enabled", false) &&
-        !android::base::GetBoolProperty("ro.virtual_ab.retrofit", false)) {
-        // Virtual A/B devices can use /data as backing storage; make sure we're
-        // not checkpointing.
-        auto vold = GetVold();
-        bool checkpointing = false;
-        if (!vold->isCheckpointing(&checkpointing).isOk()) {
-            LOG(ERROR) << "Could not determine checkpointing status.";
-            return BINDER_ERROR;
-        }
-        if (checkpointing) {
-            LOG(ERROR) << "Cannot use remount when a checkpoint is in progress.";
-            return CHECKPOINTING;
-        }
-    }
-
-    // Generate the list of supported overlayfs mount points.
-    auto overlayfs_candidates = fs_mgr_overlayfs_candidate_list(fstab);
-
-    // Generate the all remountable partitions sub-list
-    android::fs_mgr::Fstab all;
-    for (auto const& entry : fstab) {
-        if (!remountable_partition(entry)) continue;
-        if (overlayfs_candidates.empty() ||
-            GetEntryForMountPoint(&overlayfs_candidates, entry.mount_point) ||
-            (is_wrapped(overlayfs_candidates, entry) == nullptr)) {
-            all.emplace_back(entry);
-        }
-    }
-
-    // Parse the unique list of valid partition arguments.
-    android::fs_mgr::Fstab partitions;
-    for (; argc > optind; ++optind) {
-        auto partition = std::string(argv[optind]);
-        if (partition.empty()) continue;
-        if (partition == "/") partition = "/system";
-        auto find_part = [&partition](const auto& entry) {
-            const auto mount_point = system_mount_point(entry);
-            if (partition == mount_point) return true;
-            if (partition == android::base::Basename(mount_point)) return true;
-            return false;
-        };
-        // Do we know about the partition?
-        auto it = std::find_if(fstab.begin(), fstab.end(), find_part);
-        if (it == fstab.end()) {
-            LOG(ERROR) << "Unknown partition " << argv[optind] << ", skipping";
-            retval = UNKNOWN_PARTITION;
-            continue;
-        }
-        // Is that one covered by an existing overlayfs?
-        auto wrap = is_wrapped(overlayfs_candidates, *it);
-        if (wrap) {
-            LOG(INFO) << "partition " << argv[optind] << " covered by overlayfs for "
-                      << wrap->mount_point << ", switching";
-            partition = system_mount_point(*wrap);
-        }
-        // Is it a remountable partition?
-        it = std::find_if(all.begin(), all.end(), find_part);
-        if (it == all.end()) {
-            LOG(ERROR) << "Invalid partition " << argv[optind] << ", skipping";
-            retval = INVALID_PARTITION;
-            continue;
-        }
-        if (GetEntryForMountPoint(&partitions, it->mount_point) == nullptr) {
-            partitions.emplace_back(*it);
-        }
-    }
-
-    if (partitions.empty() && !retval) {
-        partitions = all;
-    }
-
-    // Check verity and optionally setup overlayfs backing.
-    auto reboot_later = false;
-    auto user_please_reboot_later = false;
-    auto setup_overlayfs = false;
-    auto just_disabled_verity = false;
-    for (auto it = partitions.begin(); it != partitions.end();) {
+bool CheckOverlayfs(Fstab* partitions, RemountCheckResult* result) {
+    bool ok = true;
+    for (auto it = partitions->begin(); it != partitions->end();) {
         auto& entry = *it;
-        auto& mount_point = entry.mount_point;
-        if (fs_mgr_is_verity_enabled(entry)) {
-            retval = VERITY_PARTITION;
-            auto ret = false;
-            if (android::base::GetProperty("ro.boot.vbmeta.device_state", "") != "locked") {
-                if (AvbOps* ops = avb_ops_user_new()) {
-                    ret = avb_user_verity_set(
-                            ops, android::base::GetProperty("ro.boot.slot_suffix", "").c_str(),
-                            false);
-                    avb_ops_user_free(ops);
-                }
-                if (!ret && fs_mgr_set_blk_ro(entry.blk_device, false)) {
-                    fec::io fh(entry.blk_device.c_str(), O_RDWR);
-                    ret = fh && fh.set_verity_status(false);
-                }
-                if (ret) {
-                    LOG(WARNING) << "Disabling verity for " << mount_point;
-                    just_disabled_verity = true;
-                    reboot_later = can_reboot;
-                    user_please_reboot_later = true;
-                }
-            }
-            if (!ret) {
-                LOG(ERROR) << "Skipping " << mount_point << " for remount";
-                it = partitions.erase(it);
+        const auto& mount_point = entry.mount_point;
+
+        if (fs_mgr_wants_overlayfs(&entry)) {
+            bool want_reboot = false;
+            bool force = result->disabled_verity;
+            if (!fs_mgr_overlayfs_setup(*partitions, mount_point.c_str(), &want_reboot, force)) {
+                LOG(ERROR) << "Overlayfs setup for " << mount_point << " failed, skipping";
+                ok = false;
+                it = partitions->erase(it);
                 continue;
             }
-        }
-
-        auto change = false;
-        errno = 0;
-        if (fs_mgr_overlayfs_setup(nullptr, mount_point.c_str(), &change, just_disabled_verity)) {
-            if (change) {
+            if (want_reboot) {
                 LOG(INFO) << "Using overlayfs for " << mount_point;
-                reboot_later = can_reboot;
-                user_please_reboot_later = true;
-                setup_overlayfs = true;
+                result->reboot_later = true;
+                result->setup_overlayfs = true;
             }
-        } else if (errno) {
-            PLOG(ERROR) << "Overlayfs setup for " << mount_point << " failed, skipping";
-            retval = BAD_OVERLAY;
-            it = partitions.erase(it);
-            continue;
         }
-        ++it;
+        it++;
+    }
+    return ok;
+}
+
+bool EnableDsuIfNeeded() {
+    auto gsid = android::gsi::GetGsiService();
+    if (!gsid) {
+        return true;
     }
 
-    // If (1) remount requires a reboot to take effect, (2) system is currently
-    // running a DSU guest and (3) DSU is disabled, then enable DSU so that the
-    // next reboot would not take us back to the host system but stay within
-    // the guest system.
-    if (reboot_later) {
-        if (auto gsid = android::gsi::GetGsiService()) {
-            auto dsu_running = false;
-            if (auto status = gsid->isGsiRunning(&dsu_running); !status.isOk()) {
-                LOG(ERROR) << "Failed to get DSU running state: " << status;
-                return BINDER_ERROR;
-            }
-            auto dsu_enabled = false;
-            if (auto status = gsid->isGsiEnabled(&dsu_enabled); !status.isOk()) {
-                LOG(ERROR) << "Failed to get DSU enabled state: " << status;
-                return BINDER_ERROR;
-            }
-            if (dsu_running && !dsu_enabled) {
-                std::string dsu_slot;
-                if (auto status = gsid->getActiveDsuSlot(&dsu_slot); !status.isOk()) {
-                    LOG(ERROR) << "Failed to get active DSU slot: " << status;
-                    return BINDER_ERROR;
-                }
-                LOG(INFO) << "DSU is running but disabled, enable DSU so that we stay within the "
-                             "DSU guest system after reboot";
-                int error = 0;
-                if (auto status = gsid->enableGsi(/* oneShot = */ true, dsu_slot, &error);
-                    !status.isOk() || error != android::gsi::IGsiService::INSTALL_OK) {
-                    LOG(ERROR) << "Failed to enable DSU: " << status << ", error code: " << error;
-                    return !status.isOk() ? BINDER_ERROR : GSID_ERROR;
-                }
-                LOG(INFO) << "Successfully enabled DSU (one-shot mode)";
-            }
+    auto dsu_running = false;
+    if (auto status = gsid->isGsiRunning(&dsu_running); !status.isOk()) {
+        LOG(ERROR) << "Failed to get DSU running state: " << status;
+        return false;
+    }
+    auto dsu_enabled = false;
+    if (auto status = gsid->isGsiEnabled(&dsu_enabled); !status.isOk()) {
+        LOG(ERROR) << "Failed to get DSU enabled state: " << status;
+        return false;
+    }
+    if (dsu_running && !dsu_enabled) {
+        std::string dsu_slot;
+        if (auto status = gsid->getActiveDsuSlot(&dsu_slot); !status.isOk()) {
+            LOG(ERROR) << "Failed to get active DSU slot: " << status;
+            return false;
+        }
+        LOG(INFO) << "DSU is running but disabled, enable DSU so that we stay within the "
+                     "DSU guest system after reboot";
+        int error = 0;
+        if (auto status = gsid->enableGsi(/* oneShot = */ true, dsu_slot, &error); !status.isOk()) {
+            LOG(ERROR) << "Failed to enable DSU: " << status;
+            return false;
+        }
+        if (error != android::gsi::IGsiService::INSTALL_OK) {
+            LOG(ERROR) << "Failed to enable DSU, error code: " << error;
+            return false;
+        }
+        LOG(INFO) << "Successfully enabled DSU (one-shot mode)";
+    }
+    return true;
+}
+
+bool RemountPartition(Fstab& fstab, Fstab& mounts, FstabEntry& entry) {
+    // unlock the r/o key for the mount point device
+    if (entry.fs_mgr_flags.logical) {
+        fs_mgr_update_logical_partition(&entry);
+    }
+    auto blk_device = entry.blk_device;
+    auto mount_point = entry.mount_point;
+
+    auto found = false;
+    for (auto it = mounts.rbegin(); it != mounts.rend(); ++it) {
+        auto& rentry = *it;
+        if (mount_point == rentry.mount_point) {
+            blk_device = rentry.blk_device;
+            found = true;
+            break;
+        }
+        // Find overlayfs mount point?
+        if ((mount_point == "/" && rentry.mount_point == "/system") ||
+            (mount_point == "/system" && rentry.mount_point == "/")) {
+            blk_device = rentry.blk_device;
+            mount_point = "/system";
+            found = true;
+            break;
+        }
+    }
+    if (!found) {
+        PLOG(INFO) << "skip unmounted partition dev:" << blk_device << " mnt:" << mount_point;
+        return true;
+    }
+    if (blk_device == "/dev/root") {
+        auto from_fstab = GetEntryForMountPoint(&fstab, mount_point);
+        if (from_fstab) blk_device = from_fstab->blk_device;
+    }
+    fs_mgr_set_blk_ro(blk_device, false);
+
+    // Find system-as-root mount point?
+    if ((mount_point == "/system") && !GetEntryForMountPoint(&mounts, mount_point) &&
+        GetEntryForMountPoint(&mounts, "/")) {
+        mount_point = "/";
+    }
+
+    // Now remount!
+    for (const auto& mnt_point : {mount_point, entry.mount_point}) {
+        if (::mount(blk_device.c_str(), mnt_point.c_str(), entry.fs_type.c_str(), MS_REMOUNT,
+                    nullptr) == 0) {
+            LOG(INFO) << "Remounted " << mnt_point << " as RW";
+            return true;
+        }
+        if (errno != EINVAL || mount_point == entry.mount_point) {
+            break;
         }
     }
 
-    if (partitions.empty() || just_disabled_verity) {
-        if (reboot_later) reboot(setup_overlayfs);
-        if (user_please_reboot_later) {
-            return MUST_REBOOT;
+    PLOG(ERROR) << "failed to remount partition dev:" << blk_device << " mnt:" << mount_point;
+    return false;
+}
+
+struct SetVerityStateResult {
+    bool success = false;
+    bool want_reboot = false;
+};
+
+SetVerityStateResult SetVerityState(bool enable_verity) {
+    const auto ab_suffix = android::base::GetProperty("ro.boot.slot_suffix", "");
+    std::unique_ptr<AvbOps, decltype(&avb_ops_user_free)> ops(avb_ops_user_new(),
+                                                              &avb_ops_user_free);
+    if (!ops) {
+        LOG(ERROR) << "Error getting AVB ops";
+        return {};
+    }
+    if (!avb_user_verity_set(ops.get(), ab_suffix.c_str(), enable_verity)) {
+        LOG(ERROR) << "Error setting verity state";
+        return {};
+    }
+    bool verification_enabled = false;
+    if (!avb_user_verification_get(ops.get(), ab_suffix.c_str(), &verification_enabled)) {
+        LOG(ERROR) << "Error getting verification state";
+        return {};
+    }
+    if (!verification_enabled) {
+        LOG(WARNING) << "AVB verification is disabled, "
+                     << (enable_verity ? "enabling" : "disabling")
+                     << " verity state may have no effect";
+        return {.success = true, .want_reboot = false};
+    }
+    const auto verity_mode = android::base::GetProperty("ro.boot.veritymode", "");
+    const bool was_enabled = (verity_mode != "disabled");
+    if ((was_enabled && enable_verity) || (!was_enabled && !enable_verity)) {
+        LOG(INFO) << "Verity is already " << (enable_verity ? "enabled" : "disabled");
+        return {.success = true, .want_reboot = false};
+    }
+    LOG(INFO) << "Successfully " << (enable_verity ? "enabled" : "disabled") << " verity";
+    return {.success = true, .want_reboot = true};
+}
+
+bool SetupOrTeardownOverlayfs(bool enable) {
+    bool want_reboot = false;
+    if (enable) {
+        Fstab fstab;
+        if (!ReadDefaultFstab(&fstab)) {
+            LOG(ERROR) << "Could not read fstab.";
+            return want_reboot;
         }
-        LOG(WARNING) << "No partitions to remount";
-        return retval;
+        if (!fs_mgr_overlayfs_setup(fstab, nullptr, &want_reboot)) {
+            LOG(ERROR) << "Overlayfs setup failed.";
+            return want_reboot;
+        }
+        if (want_reboot) {
+            printf("enabling overlayfs\n");
+        }
+    } else {
+        auto rv = fs_mgr_overlayfs_teardown(nullptr, &want_reboot);
+        if (rv == OverlayfsTeardownResult::Error) {
+            LOG(ERROR) << "Overlayfs teardown failed.";
+            return want_reboot;
+        }
+        if (rv == OverlayfsTeardownResult::Busy) {
+            LOG(ERROR) << "Overlayfs is still active until reboot.";
+            return true;
+        }
+        if (want_reboot) {
+            printf("disabling overlayfs\n");
+        }
+    }
+    return want_reboot;
+}
+
+bool do_remount(Fstab& fstab, const std::vector<std::string>& partition_args,
+                RemountCheckResult* check_result) {
+    Fstab partitions;
+    if (partition_args.empty()) {
+        partitions = GetAllRemountablePartitions(fstab);
+    } else {
+        if (!GetRemountList(fstab, partition_args, &partitions)) {
+            return false;
+        }
+    }
+
+    // Disable verity.
+    auto verity_result = SetVerityState(false /* enable_verity */);
+
+    // Treat error as fatal and suggest reboot only if verity is enabled.
+    // TODO(b/260041315): We check the device mapper for any "<partition>-verity" device present
+    // instead of checking ro.boot.veritymode because emulator has incorrect property value.
+    bool must_disable_verity = false;
+    for (const auto& partition : partitions) {
+        if (fs_mgr_is_verity_enabled(partition)) {
+            must_disable_verity = true;
+            break;
+        }
+    }
+    if (must_disable_verity) {
+        if (!verity_result.success) {
+            return false;
+        }
+        if (verity_result.want_reboot) {
+            check_result->reboot_later = true;
+            check_result->disabled_verity = true;
+        }
+    }
+
+    // Optionally setup overlayfs backing.
+    bool ok = CheckOverlayfs(&partitions, check_result);
+
+    if (partitions.empty() || check_result->disabled_verity) {
+        if (partitions.empty()) {
+            LOG(WARNING) << "No remountable partitions were found.";
+        }
+        return ok;
     }
 
     // Mount overlayfs.
-    errno = 0;
-    if (!fs_mgr_overlayfs_mount_all(&partitions) && errno) {
-        retval = BAD_OVERLAY;
-        PLOG(ERROR) << "Can not mount overlayfs for partitions";
+    if (!fs_mgr_overlayfs_mount_all(&partitions)) {
+        LOG(WARNING) << "Cannot mount overlayfs for some partitions";
+        // Continue regardless to handle raw remount case.
     }
 
     // Get actual mounts _after_ overlayfs has been added.
     android::fs_mgr::Fstab mounts;
     if (!android::fs_mgr::ReadFstabFromFile("/proc/mounts", &mounts) || mounts.empty()) {
         PLOG(ERROR) << "Failed to read /proc/mounts";
-        retval = NO_MOUNTS;
+        return false;
     }
 
     // Remount selected partitions.
     for (auto& entry : partitions) {
-        // unlock the r/o key for the mount point device
-        if (entry.fs_mgr_flags.logical) {
-            fs_mgr_update_logical_partition(&entry);
+        if (RemountPartition(fstab, mounts, entry)) {
+            check_result->remounted_anything = true;
+        } else {
+            ok = false;
         }
-        auto blk_device = entry.blk_device;
-        auto mount_point = entry.mount_point;
-
-        auto found = false;
-        for (auto it = mounts.rbegin(); it != mounts.rend(); ++it) {
-            auto& rentry = *it;
-            if (mount_point == rentry.mount_point) {
-                blk_device = rentry.blk_device;
-                found = true;
-                break;
-            }
-            // Find overlayfs mount point?
-            if ((mount_point == "/" && rentry.mount_point == "/system")  ||
-                (mount_point == "/system" && rentry.mount_point == "/")) {
-                blk_device = rentry.blk_device;
-                mount_point = "/system";
-                found = true;
-                break;
-            }
-        }
-        if (!found) {
-            PLOG(INFO) << "skip unmounted partition dev:" << blk_device << " mnt:" << mount_point;
-            continue;
-        }
-        if (blk_device == "/dev/root") {
-            auto from_fstab = GetEntryForMountPoint(&fstab, mount_point);
-            if (from_fstab) blk_device = from_fstab->blk_device;
-        }
-        fs_mgr_set_blk_ro(blk_device, false);
-
-        // Find system-as-root mount point?
-        if ((mount_point == "/system") && !GetEntryForMountPoint(&mounts, mount_point) &&
-            GetEntryForMountPoint(&mounts, "/")) {
-            mount_point = "/";
-        }
-
-        // Now remount!
-        if (::mount(blk_device.c_str(), mount_point.c_str(), entry.fs_type.c_str(), MS_REMOUNT,
-                    nullptr) == 0) {
-            continue;
-        }
-        if ((errno == EINVAL) && (mount_point != entry.mount_point)) {
-            mount_point = entry.mount_point;
-            if (::mount(blk_device.c_str(), mount_point.c_str(), entry.fs_type.c_str(), MS_REMOUNT,
-                        nullptr) == 0) {
-                continue;
-            }
-        }
-        PLOG(ERROR) << "failed to remount partition dev:" << blk_device << " mnt:" << mount_point;
-        // If errno is EROFS at this point, we are dealing with r/o
-        // filesystem types like squashfs, erofs or ext4 dedupe. We will
-        // consider such a device that does not have CONFIG_OVERLAY_FS
-        // in the kernel as a misconfigured.
-        if (errno == EROFS) {
-            LOG(ERROR) << "Consider providing all the dependencies to enable overlayfs";
-        }
-        retval = REMOUNT_FAILED;
     }
-
-    if (reboot_later) reboot(setup_overlayfs);
-    if (user_please_reboot_later) {
-        LOG(INFO) << "Now reboot your device for settings to take effect";
-        return 0;
-    }
-
-    return retval;
+    return ok;
 }
 
-static int do_clean_scratch_files() {
-    android::fs_mgr::CleanupOldScratchFiles();
-    return 0;
-}
+}  // namespace
 
 int main(int argc, char* argv[]) {
-    android::base::InitLogging(argv, MyLogger);
+    // Do not use MyLogger() when running as clean_scratch_files, as stdout/stderr of daemon process
+    // are discarded.
     if (argc > 0 && android::base::Basename(argv[0]) == "clean_scratch_files"s) {
-        return do_clean_scratch_files();
+        android::fs_mgr::CleanupOldScratchFiles();
+        return EXIT_SUCCESS;
     }
-    int result = do_remount(argc, argv);
-    if (result == MUST_REBOOT) {
-        LOG(INFO) << "Now reboot your device for settings to take effect";
-        result = 0;
-    } else if (result == REMOUNT_SUCCESS) {
-        printf("remount succeeded\n");
-    } else if (result == CLEAN_SCRATCH_FILES) {
-        return do_clean_scratch_files();
+
+    android::base::InitLogging(argv, MyLogger(false /* verbose */));
+
+    const char* fstab_file = nullptr;
+    bool auto_reboot = false;
+    bool verbose = false;
+    std::vector<std::string> partition_args;
+
+    struct option longopts[] = {
+            {"fstab", required_argument, nullptr, 'T'},
+            {"help", no_argument, nullptr, 'h'},
+            {"reboot", no_argument, nullptr, 'R'},
+            {"verbose", no_argument, nullptr, 'v'},
+            {0, 0, nullptr, 0},
+    };
+    for (int opt; (opt = ::getopt_long(argc, argv, "hRT:v", longopts, nullptr)) != -1;) {
+        switch (opt) {
+            case 'h':
+                usage();
+                return EXIT_SUCCESS;
+            case 'R':
+                auto_reboot = true;
+                break;
+            case 'T':
+                if (fstab_file) {
+                    LOG(ERROR) << "Cannot supply two fstabs: -T " << fstab_file << " -T " << optarg;
+                    usage();
+                    return EXIT_FAILURE;
+                }
+                fstab_file = optarg;
+                break;
+            case 'v':
+                verbose = true;
+                break;
+            default:
+                LOG(ERROR) << "Bad argument -" << char(opt);
+                usage();
+                return EXIT_FAILURE;
+        }
+    }
+
+    if (verbose) {
+        android::base::SetLogger(MyLogger(verbose));
+    }
+
+    bool remount = false;
+    bool enable_verity = false;
+    const std::string progname = getprogname();
+    if (progname == "enable-verity") {
+        enable_verity = true;
+    } else if (progname == "disable-verity") {
+        enable_verity = false;
+    } else if (progname == "set-verity-state") {
+        if (optind < argc && (argv[optind] == "1"s || argv[optind] == "0"s)) {
+            enable_verity = (argv[optind] == "1"s);
+        } else {
+            usage();
+            return EXIT_FAILURE;
+        }
     } else {
-        printf("remount failed\n");
+        remount = true;
+        for (; optind < argc; ++optind) {
+            partition_args.emplace_back(argv[optind]);
+        }
     }
-    return result;
+
+    // Make sure we are root.
+    if (::getuid() != 0) {
+        LOG(ERROR) << "Not running as root. Try \"adb root\" first.";
+        return EXIT_FAILURE;
+    }
+
+    // If somehow this executable is delivered on a "user" build, it can
+    // not function, so providing a clear message to the caller rather than
+    // letting if fall through and provide a lot of confusing failure messages.
+    if (!ALLOW_ADBD_DISABLE_VERITY || !android::base::GetBoolProperty("ro.debuggable", false)) {
+        LOG(ERROR) << "Device must be userdebug build";
+        return EXIT_FAILURE;
+    }
+
+    if (android::base::GetProperty("ro.boot.verifiedbootstate", "") != "orange") {
+        LOG(ERROR) << "Device must be bootloader unlocked";
+        return EXIT_FAILURE;
+    }
+
+    // Start a threadpool to service waitForService() callbacks as
+    // fs_mgr_overlayfs_* might call waitForService() to get the image service.
+    android::ProcessState::self()->startThreadPool();
+
+    if (!remount) {
+        auto ret = SetVerityState(enable_verity);
+
+        // Disable any overlayfs unconditionally if we want verity enabled.
+        // Enable overlayfs only if verity is successfully disabled or is already disabled.
+        if (enable_verity || ret.success) {
+            ret.want_reboot |= SetupOrTeardownOverlayfs(!enable_verity);
+        }
+
+        if (ret.want_reboot) {
+            if (auto_reboot) {
+                reboot(progname);
+            }
+            std::cout << "Reboot the device for new settings to take effect" << std::endl;
+        }
+        return ret.success ? EXIT_SUCCESS : EXIT_FAILURE;
+    }
+
+    // Make sure checkpointing is disabled if necessary.
+    if (!VerifyCheckpointing()) {
+        return EXIT_FAILURE;
+    }
+
+    // Read the selected fstab.
+    Fstab fstab;
+    if (!ReadFstab(fstab_file, &fstab) || fstab.empty()) {
+        PLOG(ERROR) << "Failed to read fstab";
+        return EXIT_FAILURE;
+    }
+
+    RemountCheckResult check_result;
+    bool remount_success = do_remount(fstab, partition_args, &check_result);
+
+    if (check_result.disabled_verity && check_result.setup_overlayfs) {
+        LOG(INFO) << "Verity disabled; overlayfs enabled.";
+    } else if (check_result.disabled_verity) {
+        LOG(INFO) << "Verity disabled.";
+    } else if (check_result.setup_overlayfs) {
+        LOG(INFO) << "Overlayfs enabled.";
+    }
+    if (remount_success && check_result.remounted_anything) {
+        LOG(INFO) << "Remount succeeded";
+    } else if (!remount_success) {
+        LOG(ERROR) << "Remount failed";
+    }
+    if (check_result.reboot_later) {
+        if (auto_reboot) {
+            // If (1) remount requires a reboot to take effect, (2) system is currently
+            // running a DSU guest and (3) DSU is disabled, then enable DSU so that the
+            // next reboot would not take us back to the host system but stay within
+            // the guest system.
+            if (!EnableDsuIfNeeded()) {
+                LOG(ERROR) << "Unable to automatically enable DSU";
+                return EXIT_FAILURE;
+            }
+            reboot("remount");
+        } else {
+            LOG(INFO) << "Now reboot your device for settings to take effect";
+        }
+        return EXIT_SUCCESS;
+    }
+    return remount_success ? EXIT_SUCCESS : EXIT_FAILURE;
 }
diff --git a/fs_mgr/fs_mgr_vendor_overlay.cpp b/fs_mgr/fs_mgr_vendor_overlay.cpp
index 1372511..6b32b4d 100644
--- a/fs_mgr/fs_mgr_vendor_overlay.cpp
+++ b/fs_mgr/fs_mgr_vendor_overlay.cpp
@@ -25,7 +25,6 @@
 
 #include <android-base/logging.h>
 #include <android-base/properties.h>
-#include <fs_mgr_overlayfs.h>
 #include <fs_mgr_vendor_overlay.h>
 #include <fstab/fstab.h>
 
diff --git a/fs_mgr/fuzz/fs_mgr_fstab_fuzzer.cpp b/fs_mgr/fuzz/fs_mgr_fstab_fuzzer.cpp
index 6a8a191..b5fdad4 100644
--- a/fs_mgr/fuzz/fs_mgr_fstab_fuzzer.cpp
+++ b/fs_mgr/fuzz/fs_mgr_fstab_fuzzer.cpp
@@ -14,13 +14,27 @@
 // limitations under the License.
 //
 
-#include <cstdio>
+#include <string>
+#include <vector>
 
 #include <fstab/fstab.h>
+#include <fuzzer/FuzzedDataProvider.h>
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
-    std::string make_fstab_str(reinterpret_cast<const char*>(data), size);
+    FuzzedDataProvider fdp(data, size);
+
+    std::string make_fstab_str = fdp.ConsumeRandomLengthString();
+    std::string dsu_slot = fdp.ConsumeRandomLengthString(30);
+    std::vector<std::string> dsu_partitions = {
+            fdp.ConsumeRandomLengthString(30),
+            fdp.ConsumeRandomLengthString(30),
+    };
+    std::string skip_mount_config = fdp.ConsumeRemainingBytesAsString();
+
     android::fs_mgr::Fstab fstab;
     android::fs_mgr::ParseFstabFromString(make_fstab_str, /* proc_mounts = */ false, &fstab);
+    android::fs_mgr::TransformFstabForDsu(&fstab, dsu_slot, dsu_partitions);
+    android::fs_mgr::SkipMountWithConfig(skip_mount_config, &fstab, /* verbose = */ false);
+
     return 0;
 }
diff --git a/fs_mgr/include/fs_mgr.h b/fs_mgr/include/fs_mgr.h
index 29a5e60..43de6d8 100644
--- a/fs_mgr/include/fs_mgr.h
+++ b/fs_mgr/include/fs_mgr.h
@@ -71,6 +71,8 @@
     std::string algorithm;
     // The root digest of the merkle tree.
     std::string root_digest;
+    // If check_at_most_once is enabled.
+    bool check_at_most_once;
 };
 
 // fs_mgr_mount_all() updates fstab entries that reference device-mapper.
diff --git a/fs_mgr/include/fs_mgr_overlayfs.h b/fs_mgr/include/fs_mgr_overlayfs.h
index 6caab1f..bdaabbf 100644
--- a/fs_mgr/include/fs_mgr_overlayfs.h
+++ b/fs_mgr/include/fs_mgr_overlayfs.h
@@ -17,36 +17,21 @@
 #pragma once
 
 #include <functional>
+#include <set>
+#include <string>
 
 #include <fstab/fstab.h>
 
-#include <set>
-#include <string>
-#include <vector>
-
-android::fs_mgr::Fstab fs_mgr_overlayfs_candidate_list(const android::fs_mgr::Fstab& fstab);
+// Keep the list short and only add interfaces that must be exported public.
 
 bool fs_mgr_overlayfs_mount_all(android::fs_mgr::Fstab* fstab);
-bool fs_mgr_overlayfs_setup(const char* backing = nullptr, const char* mount_point = nullptr,
-                            bool* change = nullptr, bool force = true);
-bool fs_mgr_overlayfs_teardown(const char* mount_point = nullptr, bool* change = nullptr);
 bool fs_mgr_overlayfs_is_setup();
-bool fs_mgr_has_shared_blocks(const std::string& mount_point, const std::string& dev);
-std::string fs_mgr_get_context(const std::string& mount_point);
-
-enum class OverlayfsValidResult {
-    kNotSupported = 0,
-    kOk,
-    kOverrideCredsRequired,
-};
-OverlayfsValidResult fs_mgr_overlayfs_valid();
 
 namespace android {
 namespace fs_mgr {
 
 void MapScratchPartitionIfNeeded(Fstab* fstab,
                                  const std::function<bool(const std::set<std::string>&)>& init);
-void CleanupOldScratchFiles();
 
 // Teardown overlays of all sources (cache dir, scratch device, DSU) for |mount_point|.
 // Teardown all overlays if |mount_point| is empty.
diff --git a/fs_mgr/include_fstab/fstab/fstab.h b/fs_mgr/include_fstab/fstab/fstab.h
index f26fb24..a914b53 100644
--- a/fs_mgr/include_fstab/fstab/fstab.h
+++ b/fs_mgr/include_fstab/fstab/fstab.h
@@ -31,6 +31,7 @@
 
 struct FstabEntry {
     std::string blk_device;
+    std::string zoned_device;
     std::string logical_partition_name;
     std::string mount_point;
     std::string fs_type;
@@ -94,16 +95,23 @@
 
 // Exported for testability. Regular users should use ReadFstabFromFile().
 bool ParseFstabFromString(const std::string& fstab_str, bool proc_mounts, Fstab* fstab_out);
+// Exported for testability. Regular users should use ReadDefaultFstab().
+std::string GetFstabPath();
+// Exported for testability.
+bool SkipMountWithConfig(const std::string& skip_config, Fstab* fstab, bool verbose);
 
 bool ReadFstabFromFile(const std::string& path, Fstab* fstab);
 bool ReadFstabFromDt(Fstab* fstab, bool verbose = true);
 bool ReadDefaultFstab(Fstab* fstab);
 bool SkipMountingPartitions(Fstab* fstab, bool verbose = false);
 
-FstabEntry* GetEntryForMountPoint(Fstab* fstab, const std::string& path);
 // The Fstab can contain multiple entries for the same mount point with different configurations.
 std::vector<FstabEntry*> GetEntriesForMountPoint(Fstab* fstab, const std::string& path);
 
+// Like GetEntriesForMountPoint() but return only the first entry or nullptr if no entry is found.
+FstabEntry* GetEntryForMountPoint(Fstab* fstab, const std::string& path);
+const FstabEntry* GetEntryForMountPoint(const Fstab* fstab, const std::string& path);
+
 // This method builds DSU fstab entries and transfer the fstab.
 //
 // fstab points to the unmodified fstab.
diff --git a/fs_mgr/libdm/dm.cpp b/fs_mgr/libdm/dm.cpp
index 4034e30..deffae1 100644
--- a/fs_mgr/libdm/dm.cpp
+++ b/fs_mgr/libdm/dm.cpp
@@ -20,6 +20,7 @@
 #include <sys/ioctl.h>
 #include <sys/sysmacros.h>
 #include <sys/types.h>
+#include <sys/utsname.h>
 
 #include <chrono>
 #include <functional>
@@ -289,7 +290,7 @@
     return true;
 }
 
-bool DeviceMapper::LoadTableAndActivate(const std::string& name, const DmTable& table) {
+bool DeviceMapper::LoadTable(const std::string& name, const DmTable& table) {
     std::string ioctl_buffer(sizeof(struct dm_ioctl), 0);
     ioctl_buffer += table.Serialize();
 
@@ -305,9 +306,17 @@
         PLOG(ERROR) << "DM_TABLE_LOAD failed";
         return false;
     }
+    return true;
+}
 
-    InitIo(io, name);
-    if (ioctl(fd_, DM_DEV_SUSPEND, io)) {
+bool DeviceMapper::LoadTableAndActivate(const std::string& name, const DmTable& table) {
+    if (!LoadTable(name, table)) {
+        return false;
+    }
+
+    struct dm_ioctl io;
+    InitIo(&io, name);
+    if (ioctl(fd_, DM_DEV_SUSPEND, &io)) {
         PLOG(ERROR) << "DM_TABLE_SUSPEND resume failed";
         return false;
     }
@@ -703,5 +712,28 @@
     return dm_block_devices;
 }
 
+bool DeviceMapper::CreatePlaceholderDevice(const std::string& name) {
+    if (!CreateEmptyDevice(name)) {
+        return false;
+    }
+
+    struct utsname uts;
+    unsigned int major, minor;
+    if (uname(&uts) != 0 || sscanf(uts.release, "%u.%u", &major, &minor) != 2) {
+        LOG(ERROR) << "Could not parse the kernel version from uname";
+        return true;
+    }
+
+    // On Linux 5.15+, there is no uevent until DM_TABLE_LOAD.
+    if (major > 5 || (major == 5 && minor >= 15)) {
+        DmTable table;
+        table.Emplace<DmTargetError>(0, 1);
+        if (!LoadTable(name, table)) {
+            return false;
+        }
+    }
+    return true;
+}
+
 }  // namespace dm
 }  // namespace android
diff --git a/fs_mgr/libdm/dm_test.cpp b/fs_mgr/libdm/dm_test.cpp
index 541f254..4448d35 100644
--- a/fs_mgr/libdm/dm_test.cpp
+++ b/fs_mgr/libdm/dm_test.cpp
@@ -690,3 +690,23 @@
     // Empty device should be in suspended state.
     ASSERT_EQ(DmDeviceState::SUSPENDED, dm.GetState("empty-device"));
 }
+
+TEST(libdm, UeventAfterLoadTable) {
+    static const char* kDeviceName = "libmd-test-uevent-load-table";
+
+    DeviceMapper& dm = DeviceMapper::Instance();
+    ASSERT_TRUE(dm.CreateEmptyDevice(kDeviceName));
+
+    DmTable table;
+    table.Emplace<DmTargetError>(0, 1);
+    ASSERT_TRUE(dm.LoadTable(kDeviceName, table));
+
+    std::string ignore_path;
+    ASSERT_TRUE(dm.WaitForDevice(kDeviceName, 5s, &ignore_path));
+
+    auto info = dm.GetDetailedInfo(kDeviceName);
+    ASSERT_TRUE(info.has_value());
+    ASSERT_TRUE(info->IsSuspended());
+
+    ASSERT_TRUE(dm.DeleteDevice(kDeviceName));
+}
diff --git a/fs_mgr/libdm/include/libdm/dm.h b/fs_mgr/libdm/include/libdm/dm.h
index 1057d7f..dbef8f9 100644
--- a/fs_mgr/libdm/include/libdm/dm.h
+++ b/fs_mgr/libdm/include/libdm/dm.h
@@ -75,6 +75,7 @@
                               const std::chrono::milliseconds& timeout_ms) = 0;
     virtual DmDeviceState GetState(const std::string& name) const = 0;
     virtual bool LoadTableAndActivate(const std::string& name, const DmTable& table) = 0;
+    virtual bool LoadTable(const std::string& name, const DmTable& table) = 0;
     virtual bool GetTableInfo(const std::string& name, std::vector<TargetInfo>* table) = 0;
     virtual bool GetTableStatus(const std::string& name, std::vector<TargetInfo>* table) = 0;
     virtual bool GetDmDevicePathByName(const std::string& name, std::string* path) = 0;
@@ -116,7 +117,7 @@
         bool IsBufferFull() const { return flags_ & DM_BUFFER_FULL_FLAG; }
         bool IsInactiveTablePresent() const { return flags_ & DM_INACTIVE_PRESENT_FLAG; }
         bool IsReadOnly() const { return flags_ & DM_READONLY_FLAG; }
-        bool IsSuspended() const { return flags_ & DM_SUSPEND_FLAG; }
+        bool IsSuspended() const { return !IsActiveTablePresent() || (flags_ & DM_SUSPEND_FLAG); }
     };
 
     // Removes a device mapper device with the given name.
@@ -199,6 +200,12 @@
     // Returns 'true' on success, false otherwise.
     bool LoadTableAndActivate(const std::string& name, const DmTable& table) override;
 
+    // Same as LoadTableAndActivate, but there is no resume step. This puts the
+    // new table in the inactive slot.
+    //
+    // Returns 'true' on success, false otherwise.
+    bool LoadTable(const std::string& name, const DmTable& table) override;
+
     // Returns true if a list of available device mapper targets registered in the kernel was
     // successfully read and stored in 'targets'. Returns 'false' otherwise.
     bool GetAvailableTargets(std::vector<DmTargetTypeInfo>* targets);
@@ -285,6 +292,12 @@
     // Returns mapping <partition-name, /dev/block/dm-x>
     std::map<std::string, std::string> FindDmPartitions();
 
+    // Create a placeholder device. This is useful for ensuring that a uevent is in the pipeline,
+    // to reduce the amount of time a future WaitForDevice will block. On kernels < 5.15, this
+    // simply calls CreateEmptyDevice. On 5.15 and higher, it also loads (but does not activate)
+    // a placeholder table containing dm-error.
+    bool CreatePlaceholderDevice(const std::string& name);
+
   private:
     // Maximum possible device mapper targets registered in the kernel.
     // This is only used to read the list of targets from kernel so we allocate
diff --git a/fs_mgr/libdm/include/libdm/dm_table.h b/fs_mgr/libdm/include/libdm/dm_table.h
index ee66653..427f34d 100644
--- a/fs_mgr/libdm/include/libdm/dm_table.h
+++ b/fs_mgr/libdm/include/libdm/dm_table.h
@@ -31,6 +31,7 @@
 class DmTable {
   public:
     DmTable() : num_sectors_(0), readonly_(false) {}
+    DmTable(DmTable&& other) = default;
 
     // Adds a target to the device mapper table for a range specified in the target object.
     // The function will return 'true' if the target was successfully added and doesn't overlap with
@@ -70,6 +71,8 @@
     void set_readonly(bool readonly) { readonly_ = readonly; }
     bool readonly() const { return readonly_; }
 
+    DmTable& operator=(DmTable&& other) = default;
+
     ~DmTable() = default;
 
   private:
diff --git a/fs_mgr/libdm/include/libdm/dm_target.h b/fs_mgr/libdm/include/libdm/dm_target.h
index 9543058..09fe200 100644
--- a/fs_mgr/libdm/include/libdm/dm_target.h
+++ b/fs_mgr/libdm/include/libdm/dm_target.h
@@ -323,6 +323,14 @@
     std::string control_device_;
 };
 
+class DmTargetError final : public DmTarget {
+  public:
+    DmTargetError(uint64_t start, uint64_t length) : DmTarget(start, length) {}
+
+    std::string name() const override { return "error"; }
+    std::string GetParameterString() const override { return ""; }
+};
+
 }  // namespace dm
 }  // namespace android
 
diff --git a/fs_mgr/libfiemap/binder.cpp b/fs_mgr/libfiemap/binder.cpp
index 003e6ed..41e534a 100644
--- a/fs_mgr/libfiemap/binder.cpp
+++ b/fs_mgr/libfiemap/binder.cpp
@@ -195,9 +195,14 @@
     return true;
 }
 
-bool ImageManagerBinder::DisableImage(const std::string&) {
-    LOG(ERROR) << __PRETTY_FUNCTION__ << " is not available over binder";
-    return false;
+bool ImageManagerBinder::DisableImage(const std::string& name) {
+    auto status = manager_->disableImage(name);
+    if (!status.isOk()) {
+        LOG(ERROR) << __PRETTY_FUNCTION__
+                   << " binder returned: " << status.exceptionMessage().string();
+        return false;
+    }
+    return true;
 }
 
 bool ImageManagerBinder::RemoveDisabledImages() {
diff --git a/fs_mgr/libfiemap/image_test.cpp b/fs_mgr/libfiemap/image_test.cpp
index 7472949..fb104b7 100644
--- a/fs_mgr/libfiemap/image_test.cpp
+++ b/fs_mgr/libfiemap/image_test.cpp
@@ -14,11 +14,13 @@
 // limitations under the License.
 //
 
+#include <inttypes.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/mount.h>
 #include <sys/stat.h>
 #include <sys/types.h>
+#include <sys/vfs.h>
 
 #include <chrono>
 #include <iostream>
@@ -26,12 +28,14 @@
 
 #include <android-base/file.h>
 #include <android-base/properties.h>
+#include <android-base/stringprintf.h>
 #include <android-base/strings.h>
 #include <android-base/unique_fd.h>
 #include <ext4_utils/ext4_utils.h>
 #include <fs_mgr/file_wait.h>
 #include <gtest/gtest.h>
 #include <libdm/dm.h>
+#include <libdm/loop_control.h>
 #include <libfiemap/image_manager.h>
 
 #include "utility.h"
@@ -46,7 +50,7 @@
 using android::fs_mgr::WaitForFile;
 
 static std::string gDataPath;
-static std::string gDataMountPath;
+static std::string gTestDir;
 static constexpr char kMetadataPath[] = "/metadata/gsi/test";
 
 static constexpr uint64_t kTestImageSize = 1024 * 1024;
@@ -178,6 +182,119 @@
 
 INSTANTIATE_TEST_SUITE_P(IsSubdirTest, IsSubdirTest, ::testing::ValuesIn(IsSubdirTestValues()));
 
+// This allows test cases for filesystems with larger than 4KiB alignment.
+// It creates a loop device, formats it with a FAT filesystem, and then
+// creates an ImageManager so backing images can be created on that filesystem.
+class VfatTest : public ::testing::Test {
+  protected:
+    // 64MB Filesystem and 32k block size by default
+    static constexpr uint64_t kBlockSize = 32768;
+    static constexpr uint64_t kFilesystemSize = 64 * 1024 * 1024;
+
+    void SetUp() override {
+        const ::testing::TestInfo* tinfo = ::testing::UnitTest::GetInstance()->current_test_info();
+        base_name_ = tinfo->name();
+
+        fs_path_ = gTestDir + "/vfat.img";
+        uint64_t count = kFilesystemSize / kBlockSize;
+        std::string dd_cmd =
+                ::android::base::StringPrintf("/system/bin/dd if=/dev/zero of=%s bs=%" PRIu64
+                                              " count=%" PRIu64 " > /dev/null 2>&1",
+                                              fs_path_.c_str(), kBlockSize, count);
+        // create mount point
+        mntpoint_ = std::string(getenv("TMPDIR")) + "/fiemap_mnt";
+        if (mkdir(mntpoint_.c_str(), S_IRWXU) < 0) {
+            ASSERT_EQ(errno, EEXIST) << strerror(errno);
+        }
+
+        // create file for the file system
+        int ret = system(dd_cmd.c_str());
+        ASSERT_EQ(ret, 0);
+
+        // Get and attach a loop device to the filesystem we created
+        loop_device_.emplace(fs_path_, 10s);
+        ASSERT_TRUE(loop_device_->valid());
+
+        // create file system
+        uint64_t sectors = kFilesystemSize / 512;
+        std::string mkfs_cmd =
+                ::android::base::StringPrintf("/system/bin/newfs_msdos -A -O Android -s %" PRIu64
+                                              " -b %" PRIu64 " %s > /dev/null 2>&1",
+                                              sectors, kBlockSize, loop_device_->device().c_str());
+        ret = system(mkfs_cmd.c_str());
+        ASSERT_EQ(ret, 0);
+
+        // Create a wrapping DM device to prevent gsid taking the loopback path.
+        auto& dm = DeviceMapper::Instance();
+        DmTable table;
+        table.Emplace<DmTargetLinear>(0, kFilesystemSize / 512, loop_device_->device(), 0);
+
+        dm_name_ = android::base::Basename(loop_device_->device()) + "-wrapper";
+        ASSERT_TRUE(dm.CreateDevice(dm_name_, table, &dm_path_, 10s));
+
+        // mount the file system
+        ASSERT_EQ(mount(dm_path_.c_str(), mntpoint_.c_str(), "vfat", 0, nullptr), 0)
+                << strerror(errno);
+    }
+
+    void TearDown() override {
+        // Clear up anything backed on the temporary FS.
+        if (manager_) {
+            manager_->UnmapImageIfExists(base_name_);
+            manager_->DeleteBackingImage(base_name_);
+        }
+
+        // Unmount temporary FS.
+        if (umount(mntpoint_.c_str()) < 0) {
+            ASSERT_EQ(errno, EINVAL) << strerror(errno);
+        }
+
+        // Destroy the dm wrapper.
+        auto& dm = DeviceMapper::Instance();
+        ASSERT_TRUE(dm.DeleteDeviceIfExists(dm_name_));
+
+        // Destroy the loop device.
+        loop_device_ = {};
+
+        // Destroy the temporary FS.
+        if (rmdir(mntpoint_.c_str()) < 0) {
+            ASSERT_EQ(errno, ENOENT) << strerror(errno);
+        }
+        if (unlink(fs_path_.c_str()) < 0) {
+            ASSERT_EQ(errno, ENOENT) << strerror(errno);
+        }
+    }
+
+    std::string base_name_;
+    std::string mntpoint_;
+    std::string fs_path_;
+    std::optional<LoopDevice> loop_device_;
+    std::string dm_name_;
+    std::string dm_path_;
+    std::unique_ptr<ImageManager> manager_;
+};
+
+// The actual size of the block device should be the requested size. For
+// example, a 16KB image should be mapped as a 16KB device, even if the
+// underlying filesystem requires 32KB to be fallocated.
+TEST_F(VfatTest, DeviceIsRequestedSize) {
+    manager_ = ImageManager::Open(kMetadataPath, mntpoint_);
+    ASSERT_NE(manager_, nullptr);
+
+    manager_->set_partition_opener(std::make_unique<TestPartitionOpener>());
+
+    // Create something not aligned to the backing fs block size.
+    constexpr uint64_t kTestSize = (kBlockSize * 64) - (kBlockSize / 2);
+    ASSERT_TRUE(manager_->CreateBackingImage(base_name_, kTestSize, false, nullptr));
+
+    std::string path;
+    ASSERT_TRUE(manager_->MapImageDevice(base_name_, 10s, &path));
+
+    unique_fd fd(open(path.c_str(), O_RDONLY | O_CLOEXEC));
+    ASSERT_GE(fd, 0);
+    ASSERT_EQ(get_block_device_size(fd.get()), kTestSize);
+}
+
 }  // namespace
 
 bool Mkdir(const std::string& path) {
@@ -194,13 +311,27 @@
     if (argc >= 2) {
         gDataPath = argv[1];
     } else {
-        gDataPath = "/data/gsi/test";
+        gDataPath = "/data/local/tmp";
     }
-    gDataMountPath = gDataPath + "/mnt"s;
 
-    if (!Mkdir(gDataPath) || !Mkdir(kMetadataPath) || !Mkdir(gDataMountPath) ||
-        !Mkdir(kMetadataPath + "/mnt"s)) {
+    if (!Mkdir(gDataPath) || !Mkdir(kMetadataPath) || !Mkdir(kMetadataPath + "/mnt"s)) {
         return 1;
     }
-    return RUN_ALL_TESTS();
+
+    std::string tempdir = gDataPath + "/XXXXXX";
+    if (!mkdtemp(tempdir.data())) {
+        std::cerr << "unable to create tempdir on " << tempdir << "\n";
+        exit(EXIT_FAILURE);
+    }
+    if (!android::base::Realpath(tempdir, &gTestDir)) {
+        std::cerr << "unable to find realpath for " << tempdir;
+        exit(EXIT_FAILURE);
+    }
+
+    auto rv = RUN_ALL_TESTS();
+
+    std::string cmd = "rm -rf " + gTestDir;
+    system(cmd.c_str());
+
+    return rv;
 }
diff --git a/fs_mgr/libfiemap/include/libfiemap/image_manager.h b/fs_mgr/libfiemap/include/libfiemap/image_manager.h
index 00dd661..0619c96 100644
--- a/fs_mgr/libfiemap/include/libfiemap/image_manager.h
+++ b/fs_mgr/libfiemap/include/libfiemap/image_manager.h
@@ -112,9 +112,6 @@
 
     // Mark an image as disabled. This is useful for marking an image as
     // will-be-deleted in recovery, since recovery cannot mount /data.
-    //
-    // This is not available in binder, since it is intended for recovery.
-    // When binder is available, images can simply be removed.
     virtual bool DisableImage(const std::string& name) = 0;
 
     // Remove all images that been marked as disabled.
diff --git a/fs_mgr/liblp/TEST_MAPPING b/fs_mgr/liblp/TEST_MAPPING
index 875ccb0..cf0d22b 100644
--- a/fs_mgr/liblp/TEST_MAPPING
+++ b/fs_mgr/liblp/TEST_MAPPING
@@ -4,7 +4,7 @@
       "name": "liblp_test"
     }
   ],
-  "hwasan-postsubmit": [
+  "hwasan-presubmit": [
     {
       "name": "liblp_test"
     }
diff --git a/fs_mgr/libsnapshot/Android.bp b/fs_mgr/libsnapshot/Android.bp
index 6db8f13..2165961 100644
--- a/fs_mgr/libsnapshot/Android.bp
+++ b/fs_mgr/libsnapshot/Android.bp
@@ -44,7 +44,6 @@
         "libext2_uuid",
         "libext4_utils",
         "libfstab",
-        "libsnapshot_cow",
         "libsnapshot_snapuserd",
         "libz",
     ],
@@ -75,6 +74,8 @@
     shared_libs: [
         "android.hardware.boot@1.0",
         "android.hardware.boot@1.1",
+        "android.hardware.boot-V1-ndk",
+        "libboot_control_client",
     ],
 }
 
@@ -154,22 +155,6 @@
         "-Wall",
         "-Werror",
     ],
-    export_include_dirs: ["include"],
-    srcs: [
-        "cow_decompress.cpp",
-        "cow_reader.cpp",
-        "cow_writer.cpp",
-        "cow_format.cpp",
-    ],
-}
-
-cc_library_static {
-    name: "libsnapshot_cow",
-    defaults: [
-        "libsnapshot_cow_defaults",
-    ],
-    host_supported: true,
-    recovery_available: true,
     shared_libs: [
         "libbase",
         "liblog",
@@ -177,7 +162,25 @@
     static_libs: [
         "libbrotli",
         "libz",
+        "liblz4",
     ],
+    export_include_dirs: ["include"],
+}
+
+cc_library_static {
+    name: "libsnapshot_cow",
+    defaults: [
+        "libsnapshot_cow_defaults",
+    ],
+    srcs: [
+        "libsnapshot_cow/cow_decompress.cpp",
+        "libsnapshot_cow/cow_reader.cpp",
+        "libsnapshot_cow/cow_writer.cpp",
+        "libsnapshot_cow/cow_format.cpp",
+        "libsnapshot_cow/cow_compress.cpp",
+    ],
+    host_supported: true,
+    recovery_available: true,
     ramdisk_available: true,
     vendor_ramdisk_available: true,
 }
@@ -214,7 +217,7 @@
 
 cc_defaults {
     name: "libsnapshot_test_defaults",
-    defaults: ["libsnapshot_defaults"],
+    defaults: ["libsnapshot_defaults", "libsnapshot_cow_defaults"],
     srcs: [
         "partition_cow_creator_test.cpp",
         "snapshot_metadata_updater_test.cpp",
@@ -233,6 +236,7 @@
     static_libs: [
         "android.hardware.boot@1.0",
         "android.hardware.boot@1.1",
+        "android.hardware.boot-V1-ndk",
         "libbrotli",
         "libc++fs",
         "libfs_mgr_binder",
@@ -257,11 +261,12 @@
     },
     auto_gen_config: true,
     require_root: true,
+    compile_multilib: "first",
 }
 
 cc_test {
     name: "vts_libsnapshot_test",
-    defaults: ["libsnapshot_test_defaults"],
+    defaults: ["libsnapshot_test_defaults", "libsnapshot_hal_deps"],
 }
 
 sh_test {
@@ -295,6 +300,7 @@
 
 cc_binary {
     name: "snapshotctl",
+    defaults: ["libsnapshot_cow_defaults", "libsnapshot_hal_deps"],
     srcs: [
         "snapshotctl.cpp",
     ],
@@ -308,8 +314,6 @@
         "update_metadata-protos",
     ],
     shared_libs: [
-        "android.hardware.boot@1.0",
-        "android.hardware.boot@1.1",
         "libbase",
         "libext2_uuid",
         "libext4_utils",
@@ -321,6 +325,22 @@
         "libstatslog",
         "libutils",
     ],
+    header_libs: [
+        "libstorage_literals_headers",
+    ],
+    product_variables: {
+        debuggable: {
+            cppflags: [
+                "-DSNAPSHOTCTL_USERDEBUG_OR_ENG",
+            ],
+            shared_libs: [
+                "android.hardware.boot@1.0",
+                "android.hardware.boot@1.1",
+                "android.hardware.boot-V1-ndk",
+                "libboot_control_client",
+            ],
+        },
+    },
 }
 
 cc_test {
@@ -343,6 +363,9 @@
 
 cc_defaults {
     name: "libsnapshot_fuzzer_defaults",
+    defaults: [
+        "libsnapshot_cow_defaults",
+    ],
     native_coverage : true,
     srcs: [
         // Compile the protobuf definition again with type full.
@@ -416,9 +439,10 @@
     name: "cow_api_test",
     defaults: [
         "fs_mgr_defaults",
+        "libsnapshot_cow_defaults",
     ],
     srcs: [
-        "cow_api_test.cpp",
+        "libsnapshot_cow/cow_api_test.cpp",
     ],
     cflags: [
         "-D_FILE_OFFSET_BITS=64",
@@ -471,6 +495,7 @@
         "libsparse",
         "libxz",
         "libz",
+        "liblz4",
         "libziparchive",
         "update_metadata-protos",
     ],
@@ -486,6 +511,9 @@
 
 cc_binary {
     name: "estimate_cow_from_nonab_ota",
+    defaults: [
+        "libsnapshot_cow_defaults",
+    ],
     host_supported: true,
     device_supported: false,
     cflags: [
@@ -519,6 +547,7 @@
     name: "inspect_cow",
     host_supported: true,
     device_supported: true,
+    defaults: ["libsnapshot_cow_defaults"],
     cflags: [
         "-D_FILE_OFFSET_BITS=64",
         "-Wall",
@@ -535,7 +564,7 @@
     shared_libs: [
     ],
     srcs: [
-        "inspect_cow.cpp",
+        "libsnapshot_cow/inspect_cow.cpp",
     ],
 }
 
diff --git a/fs_mgr/libsnapshot/android/snapshot/snapshot.proto b/fs_mgr/libsnapshot/android/snapshot/snapshot.proto
index 5daa84d..b3763ae 100644
--- a/fs_mgr/libsnapshot/android/snapshot/snapshot.proto
+++ b/fs_mgr/libsnapshot/android/snapshot/snapshot.proto
@@ -97,8 +97,8 @@
     // This is non-zero when |state| == MERGING or MERGE_COMPLETED.
     uint64 metadata_sectors = 8;
 
-    // True if compression is enabled, false otherwise.
-    bool compression_enabled = 9;
+    // True if using snapuserd, false otherwise.
+    bool using_snapuserd = 9;
 
     // The old partition size (if none existed, this will be zero).
     uint64 old_partition_size = 10;
@@ -184,7 +184,7 @@
     uint64 metadata_sectors = 4;
 
     // Whether compression/dm-user was used for any snapshots.
-    bool compression_enabled = 5;
+    bool using_snapuserd = 5;
 
     // Merge phase (if state == MERGING).
     MergePhase merge_phase = 6;
@@ -235,4 +235,13 @@
 
     // The source fingerprint at the time the OTA was downloaded.
     string source_build_fingerprint = 10;
+
+    // Whether this update attempt uses userspace snapshots.
+    bool userspace_snapshots_used = 11;
+
+    // Whether this update attempt uses XOR compression.
+    bool xor_compression_used = 12;
+
+    // Whether this update attempt used io_uring.
+    bool iouring_used = 13;
 }
diff --git a/fs_mgr/libsnapshot/cow_writer.cpp b/fs_mgr/libsnapshot/cow_writer.cpp
deleted file mode 100644
index 5ce1d3b..0000000
--- a/fs_mgr/libsnapshot/cow_writer.cpp
+++ /dev/null
@@ -1,609 +0,0 @@
-//
-// Copyright (C) 2020 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-
-#include <sys/types.h>
-#include <unistd.h>
-
-#include <limits>
-#include <queue>
-
-#include <android-base/file.h>
-#include <android-base/logging.h>
-#include <android-base/unique_fd.h>
-#include <brotli/encode.h>
-#include <libsnapshot/cow_reader.h>
-#include <libsnapshot/cow_writer.h>
-#include <zlib.h>
-
-namespace android {
-namespace snapshot {
-
-static_assert(sizeof(off_t) == sizeof(uint64_t));
-
-using android::base::borrowed_fd;
-using android::base::unique_fd;
-
-bool ICowWriter::AddCopy(uint64_t new_block, uint64_t old_block) {
-    if (!ValidateNewBlock(new_block)) {
-        return false;
-    }
-    return EmitCopy(new_block, old_block);
-}
-
-bool ICowWriter::AddRawBlocks(uint64_t new_block_start, const void* data, size_t size) {
-    if (size % options_.block_size != 0) {
-        LOG(ERROR) << "AddRawBlocks: size " << size << " is not a multiple of "
-                   << options_.block_size;
-        return false;
-    }
-
-    uint64_t num_blocks = size / options_.block_size;
-    uint64_t last_block = new_block_start + num_blocks - 1;
-    if (!ValidateNewBlock(last_block)) {
-        return false;
-    }
-    return EmitRawBlocks(new_block_start, data, size);
-}
-
-bool ICowWriter::AddXorBlocks(uint32_t new_block_start, const void* data, size_t size,
-                              uint32_t old_block, uint16_t offset) {
-    if (size % options_.block_size != 0) {
-        LOG(ERROR) << "AddRawBlocks: size " << size << " is not a multiple of "
-                   << options_.block_size;
-        return false;
-    }
-
-    uint64_t num_blocks = size / options_.block_size;
-    uint64_t last_block = new_block_start + num_blocks - 1;
-    if (!ValidateNewBlock(last_block)) {
-        return false;
-    }
-    if (offset >= options_.block_size) {
-        LOG(ERROR) << "AddXorBlocks: offset " << offset << " is not less than "
-                   << options_.block_size;
-    }
-    return EmitXorBlocks(new_block_start, data, size, old_block, offset);
-}
-
-bool ICowWriter::AddZeroBlocks(uint64_t new_block_start, uint64_t num_blocks) {
-    uint64_t last_block = new_block_start + num_blocks - 1;
-    if (!ValidateNewBlock(last_block)) {
-        return false;
-    }
-    return EmitZeroBlocks(new_block_start, num_blocks);
-}
-
-bool ICowWriter::AddLabel(uint64_t label) {
-    return EmitLabel(label);
-}
-
-bool ICowWriter::AddSequenceData(size_t num_ops, const uint32_t* data) {
-    return EmitSequenceData(num_ops, data);
-}
-
-bool ICowWriter::ValidateNewBlock(uint64_t new_block) {
-    if (options_.max_blocks && new_block >= options_.max_blocks.value()) {
-        LOG(ERROR) << "New block " << new_block << " exceeds maximum block count "
-                   << options_.max_blocks.value();
-        return false;
-    }
-    return true;
-}
-
-CowWriter::CowWriter(const CowOptions& options) : ICowWriter(options), fd_(-1) {
-    SetupHeaders();
-}
-
-void CowWriter::SetupHeaders() {
-    header_ = {};
-    header_.magic = kCowMagicNumber;
-    header_.major_version = kCowVersionMajor;
-    header_.minor_version = kCowVersionMinor;
-    header_.header_size = sizeof(CowHeader);
-    header_.footer_size = sizeof(CowFooter);
-    header_.op_size = sizeof(CowOperation);
-    header_.block_size = options_.block_size;
-    header_.num_merge_ops = options_.num_merge_ops;
-    header_.cluster_ops = options_.cluster_ops;
-    header_.buffer_size = 0;
-    footer_ = {};
-    footer_.op.data_length = 64;
-    footer_.op.type = kCowFooterOp;
-}
-
-bool CowWriter::ParseOptions() {
-    if (options_.compression == "gz") {
-        compression_ = kCowCompressGz;
-    } else if (options_.compression == "brotli") {
-        compression_ = kCowCompressBrotli;
-    } else if (options_.compression == "none") {
-        compression_ = kCowCompressNone;
-    } else if (!options_.compression.empty()) {
-        LOG(ERROR) << "unrecognized compression: " << options_.compression;
-        return false;
-    }
-    if (options_.cluster_ops == 1) {
-        LOG(ERROR) << "Clusters must contain at least two operations to function.";
-        return false;
-    }
-    return true;
-}
-
-bool CowWriter::SetFd(android::base::borrowed_fd fd) {
-    if (fd.get() < 0) {
-        owned_fd_.reset(open("/dev/null", O_RDWR | O_CLOEXEC));
-        if (owned_fd_ < 0) {
-            PLOG(ERROR) << "open /dev/null failed";
-            return false;
-        }
-        fd_ = owned_fd_;
-        is_dev_null_ = true;
-    } else {
-        fd_ = fd;
-
-        struct stat stat;
-        if (fstat(fd.get(), &stat) < 0) {
-            PLOG(ERROR) << "fstat failed";
-            return false;
-        }
-        is_block_device_ = S_ISBLK(stat.st_mode);
-    }
-    return true;
-}
-
-bool CowWriter::Initialize(unique_fd&& fd) {
-    owned_fd_ = std::move(fd);
-    return Initialize(borrowed_fd{owned_fd_});
-}
-
-bool CowWriter::Initialize(borrowed_fd fd) {
-    if (!SetFd(fd) || !ParseOptions()) {
-        return false;
-    }
-
-    return OpenForWrite();
-}
-
-bool CowWriter::InitializeAppend(android::base::unique_fd&& fd, uint64_t label) {
-    owned_fd_ = std::move(fd);
-    return InitializeAppend(android::base::borrowed_fd{owned_fd_}, label);
-}
-
-bool CowWriter::InitializeAppend(android::base::borrowed_fd fd, uint64_t label) {
-    if (!SetFd(fd) || !ParseOptions()) {
-        return false;
-    }
-
-    return OpenForAppend(label);
-}
-
-void CowWriter::InitPos() {
-    next_op_pos_ = sizeof(header_) + header_.buffer_size;
-    cluster_size_ = header_.cluster_ops * sizeof(CowOperation);
-    if (header_.cluster_ops) {
-        next_data_pos_ = next_op_pos_ + cluster_size_;
-    } else {
-        next_data_pos_ = next_op_pos_ + sizeof(CowOperation);
-    }
-    ops_.clear();
-    current_cluster_size_ = 0;
-    current_data_size_ = 0;
-}
-
-bool CowWriter::OpenForWrite() {
-    // This limitation is tied to the data field size in CowOperation.
-    if (header_.block_size > std::numeric_limits<uint16_t>::max()) {
-        LOG(ERROR) << "Block size is too large";
-        return false;
-    }
-
-    if (lseek(fd_.get(), 0, SEEK_SET) < 0) {
-        PLOG(ERROR) << "lseek failed";
-        return false;
-    }
-
-    if (options_.scratch_space) {
-        header_.buffer_size = BUFFER_REGION_DEFAULT_SIZE;
-    }
-
-    // Headers are not complete, but this ensures the file is at the right
-    // position.
-    if (!android::base::WriteFully(fd_, &header_, sizeof(header_))) {
-        PLOG(ERROR) << "write failed";
-        return false;
-    }
-
-    if (options_.scratch_space) {
-        // Initialize the scratch space
-        std::string data(header_.buffer_size, 0);
-        if (!android::base::WriteFully(fd_, data.data(), header_.buffer_size)) {
-            PLOG(ERROR) << "writing scratch space failed";
-            return false;
-        }
-    }
-
-    if (!Sync()) {
-        LOG(ERROR) << "Header sync failed";
-        return false;
-    }
-
-    if (lseek(fd_.get(), sizeof(header_) + header_.buffer_size, SEEK_SET) < 0) {
-        PLOG(ERROR) << "lseek failed";
-        return false;
-    }
-
-    InitPos();
-
-    return true;
-}
-
-bool CowWriter::OpenForAppend(uint64_t label) {
-    auto reader = std::make_unique<CowReader>();
-    std::queue<CowOperation> toAdd;
-
-    if (!reader->Parse(fd_, {label}) || !reader->GetHeader(&header_)) {
-        return false;
-    }
-
-    options_.block_size = header_.block_size;
-    options_.cluster_ops = header_.cluster_ops;
-
-    // Reset this, since we're going to reimport all operations.
-    footer_.op.num_ops = 0;
-    InitPos();
-
-    auto iter = reader->GetOpIter();
-
-    while (!iter->Done()) {
-        AddOperation(iter->Get());
-        iter->Next();
-    }
-
-    // Free reader so we own the descriptor position again.
-    reader = nullptr;
-
-    if (lseek(fd_.get(), next_op_pos_, SEEK_SET) < 0) {
-        PLOG(ERROR) << "lseek failed";
-        return false;
-    }
-    return EmitClusterIfNeeded();
-}
-
-bool CowWriter::EmitCopy(uint64_t new_block, uint64_t old_block) {
-    CHECK(!merge_in_progress_);
-    CowOperation op = {};
-    op.type = kCowCopyOp;
-    op.new_block = new_block;
-    op.source = old_block;
-    return WriteOperation(op);
-}
-
-bool CowWriter::EmitRawBlocks(uint64_t new_block_start, const void* data, size_t size) {
-    return EmitBlocks(new_block_start, data, size, 0, 0, kCowReplaceOp);
-}
-
-bool CowWriter::EmitXorBlocks(uint32_t new_block_start, const void* data, size_t size,
-                              uint32_t old_block, uint16_t offset) {
-    return EmitBlocks(new_block_start, data, size, old_block, offset, kCowXorOp);
-}
-
-bool CowWriter::EmitBlocks(uint64_t new_block_start, const void* data, size_t size,
-                           uint64_t old_block, uint16_t offset, uint8_t type) {
-    const uint8_t* iter = reinterpret_cast<const uint8_t*>(data);
-    CHECK(!merge_in_progress_);
-    for (size_t i = 0; i < size / header_.block_size; i++) {
-        CowOperation op = {};
-        op.new_block = new_block_start + i;
-        op.type = type;
-        if (type == kCowXorOp) {
-            op.source = (old_block + i) * header_.block_size + offset;
-        } else {
-            op.source = next_data_pos_;
-        }
-
-        if (compression_) {
-            auto data = Compress(iter, header_.block_size);
-            if (data.empty()) {
-                PLOG(ERROR) << "AddRawBlocks: compression failed";
-                return false;
-            }
-            if (data.size() > std::numeric_limits<uint16_t>::max()) {
-                LOG(ERROR) << "Compressed block is too large: " << data.size() << " bytes";
-                return false;
-            }
-            op.compression = compression_;
-            op.data_length = static_cast<uint16_t>(data.size());
-
-            if (!WriteOperation(op, data.data(), data.size())) {
-                PLOG(ERROR) << "AddRawBlocks: write failed";
-                return false;
-            }
-        } else {
-            op.data_length = static_cast<uint16_t>(header_.block_size);
-            if (!WriteOperation(op, iter, header_.block_size)) {
-                PLOG(ERROR) << "AddRawBlocks: write failed";
-                return false;
-            }
-        }
-
-        iter += header_.block_size;
-    }
-    return true;
-}
-
-bool CowWriter::EmitZeroBlocks(uint64_t new_block_start, uint64_t num_blocks) {
-    CHECK(!merge_in_progress_);
-    for (uint64_t i = 0; i < num_blocks; i++) {
-        CowOperation op = {};
-        op.type = kCowZeroOp;
-        op.new_block = new_block_start + i;
-        op.source = 0;
-        WriteOperation(op);
-    }
-    return true;
-}
-
-bool CowWriter::EmitLabel(uint64_t label) {
-    CHECK(!merge_in_progress_);
-    CowOperation op = {};
-    op.type = kCowLabelOp;
-    op.source = label;
-    return WriteOperation(op) && Sync();
-}
-
-bool CowWriter::EmitSequenceData(size_t num_ops, const uint32_t* data) {
-    CHECK(!merge_in_progress_);
-    size_t to_add = 0;
-    size_t max_ops = std::numeric_limits<uint16_t>::max() / sizeof(uint32_t);
-    while (num_ops > 0) {
-        CowOperation op = {};
-        op.type = kCowSequenceOp;
-        op.source = next_data_pos_;
-        to_add = std::min(num_ops, max_ops);
-        op.data_length = static_cast<uint16_t>(to_add * sizeof(uint32_t));
-        if (!WriteOperation(op, data, op.data_length)) {
-            PLOG(ERROR) << "AddSequenceData: write failed";
-            return false;
-        }
-        num_ops -= to_add;
-        data += to_add;
-    }
-    return true;
-}
-
-bool CowWriter::EmitCluster() {
-    CowOperation op = {};
-    op.type = kCowClusterOp;
-    // Next cluster starts after remainder of current cluster and the next data block.
-    op.source = current_data_size_ + cluster_size_ - current_cluster_size_ - sizeof(CowOperation);
-    return WriteOperation(op);
-}
-
-bool CowWriter::EmitClusterIfNeeded() {
-    // If there isn't room for another op and the cluster end op, end the current cluster
-    if (cluster_size_ && cluster_size_ < current_cluster_size_ + 2 * sizeof(CowOperation)) {
-        if (!EmitCluster()) return false;
-    }
-    return true;
-}
-
-std::basic_string<uint8_t> CowWriter::Compress(const void* data, size_t length) {
-    switch (compression_) {
-        case kCowCompressGz: {
-            auto bound = compressBound(length);
-            auto buffer = std::make_unique<uint8_t[]>(bound);
-
-            uLongf dest_len = bound;
-            auto rv = compress2(buffer.get(), &dest_len, reinterpret_cast<const Bytef*>(data),
-                                length, Z_BEST_COMPRESSION);
-            if (rv != Z_OK) {
-                LOG(ERROR) << "compress2 returned: " << rv;
-                return {};
-            }
-            return std::basic_string<uint8_t>(buffer.get(), dest_len);
-        }
-        case kCowCompressBrotli: {
-            auto bound = BrotliEncoderMaxCompressedSize(length);
-            if (!bound) {
-                LOG(ERROR) << "BrotliEncoderMaxCompressedSize returned 0";
-                return {};
-            }
-            auto buffer = std::make_unique<uint8_t[]>(bound);
-
-            size_t encoded_size = bound;
-            auto rv = BrotliEncoderCompress(
-                    BROTLI_DEFAULT_QUALITY, BROTLI_DEFAULT_WINDOW, BROTLI_DEFAULT_MODE, length,
-                    reinterpret_cast<const uint8_t*>(data), &encoded_size, buffer.get());
-            if (!rv) {
-                LOG(ERROR) << "BrotliEncoderCompress failed";
-                return {};
-            }
-            return std::basic_string<uint8_t>(buffer.get(), encoded_size);
-        }
-        default:
-            LOG(ERROR) << "unhandled compression type: " << compression_;
-            break;
-    }
-    return {};
-}
-
-// TODO: Fix compilation issues when linking libcrypto library
-// when snapuserd is compiled as part of ramdisk.
-static void SHA256(const void*, size_t, uint8_t[]) {
-#if 0
-    SHA256_CTX c;
-    SHA256_Init(&c);
-    SHA256_Update(&c, data, length);
-    SHA256_Final(out, &c);
-#endif
-}
-
-bool CowWriter::Finalize() {
-    auto continue_cluster_size = current_cluster_size_;
-    auto continue_data_size = current_data_size_;
-    auto continue_data_pos = next_data_pos_;
-    auto continue_op_pos = next_op_pos_;
-    auto continue_size = ops_.size();
-    auto continue_num_ops = footer_.op.num_ops;
-    bool extra_cluster = false;
-
-    // Blank out extra ops, in case we're in append mode and dropped ops.
-    if (cluster_size_) {
-        auto unused_cluster_space = cluster_size_ - current_cluster_size_;
-        std::string clr;
-        clr.resize(unused_cluster_space, '\0');
-        if (lseek(fd_.get(), next_op_pos_, SEEK_SET) < 0) {
-            PLOG(ERROR) << "Failed to seek to footer position.";
-            return false;
-        }
-        if (!android::base::WriteFully(fd_, clr.data(), clr.size())) {
-            PLOG(ERROR) << "clearing unused cluster area failed";
-            return false;
-        }
-    }
-
-    // Footer should be at the end of a file, so if there is data after the current block, end it
-    // and start a new cluster.
-    if (cluster_size_ && current_data_size_ > 0) {
-        EmitCluster();
-        extra_cluster = true;
-    }
-
-    footer_.op.ops_size = ops_.size();
-    if (lseek(fd_.get(), next_op_pos_, SEEK_SET) < 0) {
-        PLOG(ERROR) << "Failed to seek to footer position.";
-        return false;
-    }
-    memset(&footer_.data.ops_checksum, 0, sizeof(uint8_t) * 32);
-    memset(&footer_.data.footer_checksum, 0, sizeof(uint8_t) * 32);
-
-    SHA256(ops_.data(), ops_.size(), footer_.data.ops_checksum);
-    SHA256(&footer_.op, sizeof(footer_.op), footer_.data.footer_checksum);
-    // Write out footer at end of file
-    if (!android::base::WriteFully(fd_, reinterpret_cast<const uint8_t*>(&footer_),
-                                   sizeof(footer_))) {
-        PLOG(ERROR) << "write footer failed";
-        return false;
-    }
-
-    // Remove excess data, if we're in append mode and threw away more data
-    // than we wrote before.
-    off_t offs = lseek(fd_.get(), 0, SEEK_CUR);
-    if (offs < 0) {
-        PLOG(ERROR) << "Failed to lseek to find current position";
-        return false;
-    }
-    if (!Truncate(offs)) {
-        return false;
-    }
-
-    // Reposition for additional Writing
-    if (extra_cluster) {
-        current_cluster_size_ = continue_cluster_size;
-        current_data_size_ = continue_data_size;
-        next_data_pos_ = continue_data_pos;
-        next_op_pos_ = continue_op_pos;
-        footer_.op.num_ops = continue_num_ops;
-        ops_.resize(continue_size);
-    }
-    return Sync();
-}
-
-uint64_t CowWriter::GetCowSize() {
-    if (current_data_size_ > 0) {
-        return next_data_pos_ + sizeof(footer_);
-    } else {
-        return next_op_pos_ + sizeof(footer_);
-    }
-}
-
-bool CowWriter::GetDataPos(uint64_t* pos) {
-    off_t offs = lseek(fd_.get(), 0, SEEK_CUR);
-    if (offs < 0) {
-        PLOG(ERROR) << "lseek failed";
-        return false;
-    }
-    *pos = offs;
-    return true;
-}
-
-bool CowWriter::WriteOperation(const CowOperation& op, const void* data, size_t size) {
-    if (lseek(fd_.get(), next_op_pos_, SEEK_SET) < 0) {
-        PLOG(ERROR) << "lseek failed for writing operation.";
-        return false;
-    }
-    if (!android::base::WriteFully(fd_, reinterpret_cast<const uint8_t*>(&op), sizeof(op))) {
-        return false;
-    }
-    if (data != nullptr && size > 0) {
-        if (!WriteRawData(data, size)) return false;
-    }
-    AddOperation(op);
-    return EmitClusterIfNeeded();
-}
-
-void CowWriter::AddOperation(const CowOperation& op) {
-    footer_.op.num_ops++;
-
-    if (op.type == kCowClusterOp) {
-        current_cluster_size_ = 0;
-        current_data_size_ = 0;
-    } else if (header_.cluster_ops) {
-        current_cluster_size_ += sizeof(op);
-        current_data_size_ += op.data_length;
-    }
-
-    next_data_pos_ += op.data_length + GetNextDataOffset(op, header_.cluster_ops);
-    next_op_pos_ += sizeof(CowOperation) + GetNextOpOffset(op, header_.cluster_ops);
-    ops_.insert(ops_.size(), reinterpret_cast<const uint8_t*>(&op), sizeof(op));
-}
-
-bool CowWriter::WriteRawData(const void* data, size_t size) {
-    if (lseek(fd_.get(), next_data_pos_, SEEK_SET) < 0) {
-        PLOG(ERROR) << "lseek failed for writing data.";
-        return false;
-    }
-
-    if (!android::base::WriteFully(fd_, data, size)) {
-        return false;
-    }
-    return true;
-}
-
-bool CowWriter::Sync() {
-    if (is_dev_null_) {
-        return true;
-    }
-    if (fsync(fd_.get()) < 0) {
-        PLOG(ERROR) << "fsync failed";
-        return false;
-    }
-    return true;
-}
-
-bool CowWriter::Truncate(off_t length) {
-    if (is_dev_null_ || is_block_device_) {
-        return true;
-    }
-    if (ftruncate(fd_.get(), length) < 0) {
-        PLOG(ERROR) << "Failed to truncate.";
-        return false;
-    }
-    return true;
-}
-
-}  // namespace snapshot
-}  // namespace android
diff --git a/fs_mgr/libsnapshot/device_info.cpp b/fs_mgr/libsnapshot/device_info.cpp
index a6d96ed..0ab6103 100644
--- a/fs_mgr/libsnapshot/device_info.cpp
+++ b/fs_mgr/libsnapshot/device_info.cpp
@@ -23,8 +23,9 @@
 namespace snapshot {
 
 #ifdef LIBSNAPSHOT_USE_HAL
-using android::hardware::boot::V1_0::BoolResult;
-using android::hardware::boot::V1_0::CommandResult;
+using android::hal::BootControlClient;
+using android::hal::BootControlVersion;
+using android::hal::CommandResult;
 #endif
 
 using namespace std::chrono_literals;
@@ -63,16 +64,16 @@
 #ifdef LIBSNAPSHOT_USE_HAL
 bool DeviceInfo::EnsureBootHal() {
     if (!boot_control_) {
-        auto hal = android::hardware::boot::V1_0::IBootControl::getService();
+        auto hal = BootControlClient::WaitForService();
         if (!hal) {
             LOG(ERROR) << "Could not find IBootControl HAL";
             return false;
         }
-        boot_control_ = android::hardware::boot::V1_1::IBootControl::castFrom(hal);
-        if (!boot_control_) {
+        if (hal->GetVersion() < BootControlVersion::BOOTCTL_V1_1) {
             LOG(ERROR) << "Could not find IBootControl 1.1 HAL";
             return false;
         }
+        boot_control_ = std::move(hal);
     }
     return true;
 }
@@ -83,8 +84,9 @@
     if (!EnsureBootHal()) {
         return false;
     }
-    if (!boot_control_->setSnapshotMergeStatus(status)) {
-        LOG(ERROR) << "Unable to set the snapshot merge status";
+    const auto ret = boot_control_->SetSnapshotMergeStatus(status);
+    if (!ret.IsOk()) {
+        LOG(ERROR) << "Unable to set the snapshot merge status " << ret.errMsg;
         return false;
     }
     return true;
@@ -108,9 +110,7 @@
         return false;
     }
 
-    CommandResult result = {};
-    auto cb = [&](CommandResult r) -> void { result = r; };
-    boot_control_->setSlotAsUnbootable(slot, cb);
+    CommandResult result = boot_control_->MarkSlotUnbootable(slot);
     if (!result.success) {
         LOG(ERROR) << "Error setting slot " << slot << " unbootable: " << result.errMsg;
         return false;
diff --git a/fs_mgr/libsnapshot/device_info.h b/fs_mgr/libsnapshot/device_info.h
index 8aefb85..d06f1be 100644
--- a/fs_mgr/libsnapshot/device_info.h
+++ b/fs_mgr/libsnapshot/device_info.h
@@ -17,7 +17,7 @@
 #include <string>
 
 #ifdef LIBSNAPSHOT_USE_HAL
-#include <android/hardware/boot/1.1/IBootControl.h>
+#include <BootControlClient.h>
 #endif
 #include <liblp/partition_opener.h>
 #include <libsnapshot/snapshot.h>
@@ -26,7 +26,7 @@
 namespace snapshot {
 
 class DeviceInfo final : public SnapshotManager::IDeviceInfo {
-    using MergeStatus = android::hardware::boot::V1_1::MergeStatus;
+    using MergeStatus = ::aidl::android::hardware::boot::MergeStatus;
 
   public:
     std::string GetMetadataDir() const override;
@@ -50,7 +50,7 @@
     android::fs_mgr::PartitionOpener opener_;
     bool first_stage_init_ = false;
 #ifdef LIBSNAPSHOT_USE_HAL
-    android::sp<android::hardware::boot::V1_1::IBootControl> boot_control_;
+    std::unique_ptr<::android::hal::BootControlClient> boot_control_;
 #endif
 };
 
diff --git a/fs_mgr/libsnapshot/include/libsnapshot/cow_format.h b/fs_mgr/libsnapshot/include/libsnapshot/cow_format.h
index 9f4ddbb..ba75a8d 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/cow_format.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/cow_format.h
@@ -154,9 +154,12 @@
 static constexpr uint8_t kCowSequenceOp = 7;
 static constexpr uint8_t kCowFooterOp = -1;
 
-static constexpr uint8_t kCowCompressNone = 0;
-static constexpr uint8_t kCowCompressGz = 1;
-static constexpr uint8_t kCowCompressBrotli = 2;
+enum CowCompressionAlgorithm : uint8_t {
+    kCowCompressNone = 0,
+    kCowCompressGz = 1,
+    kCowCompressBrotli = 2,
+    kCowCompressLz4 = 3
+};
 
 static constexpr uint8_t kCowReadAheadNotStarted = 0;
 static constexpr uint8_t kCowReadAheadInProgress = 1;
diff --git a/fs_mgr/libsnapshot/include/libsnapshot/cow_reader.h b/fs_mgr/libsnapshot/include/libsnapshot/cow_reader.h
index fbdd6b9..e8e4d72 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/cow_reader.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/cow_reader.h
@@ -74,7 +74,7 @@
     virtual bool GetLastLabel(uint64_t* label) = 0;
 
     // Return an iterator for retrieving CowOperation entries.
-    virtual std::unique_ptr<ICowOpIter> GetOpIter() = 0;
+    virtual std::unique_ptr<ICowOpIter> GetOpIter(bool merge_progress) = 0;
 
     // Return an iterator for retrieving CowOperation entries in reverse merge order
     virtual std::unique_ptr<ICowOpIter> GetRevMergeOpIter(bool ignore_progress) = 0;
@@ -115,7 +115,7 @@
         USERSPACE_MERGE = 1,
     };
 
-    CowReader(ReaderFlags reader_flag = ReaderFlags::DEFAULT);
+    CowReader(ReaderFlags reader_flag = ReaderFlags::DEFAULT, bool is_merge = false);
     ~CowReader() { owned_fd_ = {}; }
 
     // Parse the COW, optionally, up to the given label. If no label is
@@ -135,7 +135,7 @@
     // CowOperation objects. Get() returns a unique CowOperation object
     // whose lifetime depends on the CowOpIter object; the return
     // value of these will never be null.
-    std::unique_ptr<ICowOpIter> GetOpIter() override;
+    std::unique_ptr<ICowOpIter> GetOpIter(bool merge_progress = false) override;
     std::unique_ptr<ICowOpIter> GetRevMergeOpIter(bool ignore_progress = false) override;
     std::unique_ptr<ICowOpIter> GetMergeOpIter(bool ignore_progress = false) override;
 
@@ -177,6 +177,7 @@
     bool has_seq_ops_{};
     std::shared_ptr<std::unordered_map<uint64_t, uint64_t>> data_loc_;
     ReaderFlags reader_flag_;
+    bool is_merge_{};
 };
 
 }  // namespace snapshot
diff --git a/fs_mgr/libsnapshot/include/libsnapshot/cow_writer.h b/fs_mgr/libsnapshot/include/libsnapshot/cow_writer.h
index e17b5c6..798bc73 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/cow_writer.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/cow_writer.h
@@ -16,9 +16,17 @@
 
 #include <stdint.h>
 
+#include <condition_variable>
+#include <cstdint>
+#include <future>
 #include <memory>
+#include <mutex>
 #include <optional>
+#include <queue>
 #include <string>
+#include <thread>
+#include <utility>
+#include <vector>
 
 #include <android-base/unique_fd.h>
 #include <libsnapshot/cow_format.h>
@@ -41,6 +49,12 @@
 
     // Preset the number of merged ops. Only useful for testing.
     uint64_t num_merge_ops = 0;
+
+    // Number of threads for compression
+    int num_compress_threads = 0;
+
+    // Batch write cluster ops
+    bool batch_write = false;
 };
 
 // Interface for writing to a snapuserd COW. All operations are ordered; merges
@@ -52,8 +66,9 @@
     virtual ~ICowWriter() {}
 
     // Encode an operation that copies the contents of |old_block| to the
-    // location of |new_block|.
-    bool AddCopy(uint64_t new_block, uint64_t old_block);
+    // location of |new_block|. 'num_blocks' is the number of contiguous
+    // COPY operations from |old_block| to |new_block|.
+    bool AddCopy(uint64_t new_block, uint64_t old_block, uint64_t num_blocks = 1);
 
     // Encode a sequence of raw blocks. |size| must be a multiple of the block size.
     bool AddRawBlocks(uint64_t new_block_start, const void* data, size_t size);
@@ -84,7 +99,7 @@
     const CowOptions& options() { return options_; }
 
   protected:
-    virtual bool EmitCopy(uint64_t new_block, uint64_t old_block) = 0;
+    virtual bool EmitCopy(uint64_t new_block, uint64_t old_block, uint64_t num_blocks = 1) = 0;
     virtual bool EmitRawBlocks(uint64_t new_block_start, const void* data, size_t size) = 0;
     virtual bool EmitXorBlocks(uint32_t new_block_start, const void* data, size_t size,
                                uint32_t old_block, uint16_t offset) = 0;
@@ -98,9 +113,40 @@
     CowOptions options_;
 };
 
+class CompressWorker {
+  public:
+    CompressWorker(CowCompressionAlgorithm compression, uint32_t block_size);
+    bool RunThread();
+    void EnqueueCompressBlocks(const void* buffer, size_t num_blocks);
+    bool GetCompressedBuffers(std::vector<std::basic_string<uint8_t>>* compressed_buf);
+    void Finalize();
+
+  private:
+    struct CompressWork {
+        const void* buffer;
+        size_t num_blocks;
+        bool compression_status = false;
+        std::vector<std::basic_string<uint8_t>> compressed_data;
+    };
+
+    CowCompressionAlgorithm compression_;
+    uint32_t block_size_;
+
+    std::queue<CompressWork> work_queue_;
+    std::queue<CompressWork> compressed_queue_;
+    std::mutex lock_;
+    std::condition_variable cv_;
+    bool stopped_ = false;
+
+    std::basic_string<uint8_t> Compress(const void* data, size_t length);
+    bool CompressBlocks(const void* buffer, size_t num_blocks,
+                        std::vector<std::basic_string<uint8_t>>* compressed_data);
+};
+
 class CowWriter : public ICowWriter {
   public:
     explicit CowWriter(const CowOptions& options);
+    ~CowWriter();
 
     // Set up the writer.
     // The file starts from the beginning.
@@ -122,7 +168,7 @@
     uint32_t GetCowVersion() { return header_.major_version; }
 
   protected:
-    virtual bool EmitCopy(uint64_t new_block, uint64_t old_block) override;
+    virtual bool EmitCopy(uint64_t new_block, uint64_t old_block, uint64_t num_blocks = 1) override;
     virtual bool EmitRawBlocks(uint64_t new_block_start, const void* data, size_t size) override;
     virtual bool EmitXorBlocks(uint32_t new_block_start, const void* data, size_t size,
                                uint32_t old_block, uint16_t offset) override;
@@ -136,6 +182,7 @@
     bool EmitBlocks(uint64_t new_block_start, const void* data, size_t size, uint64_t old_block,
                     uint16_t offset, uint8_t type);
     void SetupHeaders();
+    void SetupWriteOptions();
     bool ParseOptions();
     bool OpenForWrite();
     bool OpenForAppend(uint64_t label);
@@ -143,31 +190,50 @@
     bool WriteRawData(const void* data, size_t size);
     bool WriteOperation(const CowOperation& op, const void* data = nullptr, size_t size = 0);
     void AddOperation(const CowOperation& op);
-    std::basic_string<uint8_t> Compress(const void* data, size_t length);
     void InitPos();
+    void InitBatchWrites();
+    void InitWorkers();
+    bool FlushCluster();
 
+    bool CompressBlocks(size_t num_blocks, const void* data);
     bool SetFd(android::base::borrowed_fd fd);
     bool Sync();
     bool Truncate(off_t length);
+    bool EnsureSpaceAvailable(const uint64_t bytes_needed) const;
 
   private:
     android::base::unique_fd owned_fd_;
     android::base::borrowed_fd fd_;
     CowHeader header_{};
     CowFooter footer_{};
-    int compression_ = 0;
+    CowCompressionAlgorithm compression_ = kCowCompressNone;
+    uint64_t current_op_pos_ = 0;
     uint64_t next_op_pos_ = 0;
     uint64_t next_data_pos_ = 0;
+    uint64_t current_data_pos_ = 0;
+    ssize_t total_data_written_ = 0;
     uint32_t cluster_size_ = 0;
     uint32_t current_cluster_size_ = 0;
     uint64_t current_data_size_ = 0;
     bool is_dev_null_ = false;
     bool merge_in_progress_ = false;
     bool is_block_device_ = false;
+    uint64_t cow_image_size_ = INT64_MAX;
 
-    // :TODO: this is not efficient, but stringstream ubsan aborts because some
-    // bytes overflow a signed char.
-    std::basic_string<uint8_t> ops_;
+    int num_compress_threads_ = 1;
+    std::vector<std::unique_ptr<CompressWorker>> compress_threads_;
+    std::vector<std::future<bool>> threads_;
+    std::vector<std::basic_string<uint8_t>> compressed_buf_;
+    std::vector<std::basic_string<uint8_t>>::iterator buf_iter_;
+
+    std::vector<std::unique_ptr<CowOperation>> opbuffer_vec_;
+    std::vector<std::unique_ptr<uint8_t[]>> databuffer_vec_;
+    std::unique_ptr<struct iovec[]> cowop_vec_;
+    int op_vec_index_ = 0;
+
+    std::unique_ptr<struct iovec[]> data_vec_;
+    int data_vec_index_ = 0;
+    bool batch_write_ = false;
 };
 
 }  // namespace snapshot
diff --git a/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot.h b/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot.h
index ba62330..d458b87 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot.h
@@ -62,6 +62,7 @@
     MOCK_METHOD(std::unique_ptr<AutoDevice>, EnsureMetadataMounted, (), (override));
     MOCK_METHOD(ISnapshotMergeStats*, GetSnapshotMergeStatsInstance, (), (override));
     MOCK_METHOD(std::string, ReadSourceBuildFingerprint, (), (override));
+    MOCK_METHOD(void, SetMergeStatsFeatures, (ISnapshotMergeStats*), (override));
 };
 
 }  // namespace android::snapshot
diff --git a/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot_merge_stats.h b/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot_merge_stats.h
index 3d384cc..8280f2e 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot_merge_stats.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot_merge_stats.h
@@ -28,10 +28,7 @@
     virtual ~MockSnapshotMergeStats() = default;
     // Called when merge starts or resumes.
     MOCK_METHOD(bool, Start, (), (override));
-    MOCK_METHOD(void, set_state, (android::snapshot::UpdateState, bool), (override));
-    MOCK_METHOD(void, set_cow_file_size, (uint64_t), ());
-    MOCK_METHOD(void, set_total_cow_size_bytes, (uint64_t), (override));
-    MOCK_METHOD(void, set_estimated_cow_size_bytes, (uint64_t), (override));
+    MOCK_METHOD(void, set_state, (android::snapshot::UpdateState), (override));
     MOCK_METHOD(void, set_boot_complete_time_ms, (uint32_t), (override));
     MOCK_METHOD(void, set_boot_complete_to_merge_start_time_ms, (uint32_t), (override));
     MOCK_METHOD(void, set_merge_failure_code, (MergeFailureCode), (override));
@@ -45,6 +42,7 @@
     MOCK_METHOD(MergeFailureCode, merge_failure_code, (), (override));
     MOCK_METHOD(std::unique_ptr<Result>, Finish, (), (override));
     MOCK_METHOD(bool, WriteState, (), (override));
+    MOCK_METHOD(SnapshotMergeReport*, report, (), (override));
 
     using ISnapshotMergeStats::Result;
     // Return nullptr if any failure.
diff --git a/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot_writer.h b/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot_writer.h
index b0be5a5..29828bc 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot_writer.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot_writer.h
@@ -34,7 +34,7 @@
     // Returns true if AddCopy() operations are supported.
     MOCK_METHOD(bool, SupportsCopyOperation, (), (const override));
 
-    MOCK_METHOD(bool, EmitCopy, (uint64_t, uint64_t), (override));
+    MOCK_METHOD(bool, EmitCopy, (uint64_t, uint64_t, uint64_t), (override));
     MOCK_METHOD(bool, EmitRawBlocks, (uint64_t, const void*, size_t), (override));
     MOCK_METHOD(bool, EmitXorBlocks, (uint32_t, const void*, size_t, uint32_t, uint16_t),
                 (override));
diff --git a/fs_mgr/libsnapshot/include/libsnapshot/snapshot.h b/fs_mgr/libsnapshot/include/libsnapshot/snapshot.h
index 11da568..cdff06e 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/snapshot.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/snapshot.h
@@ -46,6 +46,10 @@
 #define DEFINED_FRIEND_TEST
 #endif
 
+namespace aidl::android::hardware::boot {
+enum class MergeStatus;
+}
+
 namespace android {
 
 namespace fiemap {
@@ -59,13 +63,6 @@
 
 // Forward declare IBootControl types since we cannot include only the headers
 // with Soong. Note: keep the enum width in sync.
-namespace hardware {
-namespace boot {
-namespace V1_1 {
-enum class MergeStatus : int32_t;
-}  // namespace V1_1
-}  // namespace boot
-}  // namespace hardware
 
 namespace snapshot {
 
@@ -95,6 +92,7 @@
     class IDeviceInfo {
       public:
         using IImageManager = android::fiemap::IImageManager;
+        using MergeStatus = aidl::android::hardware::boot::MergeStatus;
 
         virtual ~IDeviceInfo() {}
         virtual std::string GetMetadataDir() const = 0;
@@ -103,8 +101,7 @@
         virtual std::string GetSuperDevice(uint32_t slot) const = 0;
         virtual const android::fs_mgr::IPartitionOpener& GetPartitionOpener() const = 0;
         virtual bool IsOverlayfsSetup() const = 0;
-        virtual bool SetBootControlMergeStatus(
-                android::hardware::boot::V1_1::MergeStatus status) = 0;
+        virtual bool SetBootControlMergeStatus(MergeStatus status) = 0;
         virtual bool SetSlotAsUnbootable(unsigned int slot) = 0;
         virtual bool IsRecovery() const = 0;
         virtual bool IsTestDevice() const { return false; }
@@ -134,6 +131,9 @@
     // may need to be merged before wiping.
     virtual bool FinishedSnapshotWrites(bool wipe) = 0;
 
+    // Set feature flags on an ISnapshotMergeStats object.
+    virtual void SetMergeStatsFeatures(ISnapshotMergeStats* stats) = 0;
+
     // Update an ISnapshotMergeStats object with statistics about COW usage.
     // This should be called before the merge begins as otherwise snapshots
     // may be deleted.
@@ -308,7 +308,7 @@
     using LpMetadata = android::fs_mgr::LpMetadata;
     using MetadataBuilder = android::fs_mgr::MetadataBuilder;
     using DeltaArchiveManifest = chromeos_update_engine::DeltaArchiveManifest;
-    using MergeStatus = android::hardware::boot::V1_1::MergeStatus;
+    using MergeStatus = aidl::android::hardware::boot::MergeStatus;
     using FiemapStatus = android::fiemap::FiemapStatus;
 
     friend class SnapshotMergeStats;
@@ -332,10 +332,13 @@
     // Helper function for second stage init to restorecon on the rollback indicator.
     static std::string GetGlobalRollbackIndicatorPath();
 
-    // Detach dm-user devices from the current snapuserd, and populate
-    // |snapuserd_argv| with the necessary arguments to restart snapuserd
-    // and reattach them.
-    bool DetachSnapuserdForSelinux(std::vector<std::string>* snapuserd_argv);
+    // Populate |snapuserd_argv| with the necessary arguments to restart snapuserd
+    // after loading selinux policy.
+    bool PrepareSnapuserdArgsForSelinux(std::vector<std::string>* snapuserd_argv);
+
+    // Detach dm-user devices from the first stage snapuserd. Load
+    // new dm-user tables after loading selinux policy.
+    bool DetachFirstStageSnapuserdForSelinux();
 
     // Perform the transition from the selinux stage of snapuserd into the
     // second-stage of snapuserd. This process involves re-creating the dm-user
@@ -378,6 +381,7 @@
     bool MapAllSnapshots(const std::chrono::milliseconds& timeout_ms = {}) override;
     bool UnmapAllSnapshots() override;
     std::string ReadSourceBuildFingerprint() override;
+    void SetMergeStatsFeatures(ISnapshotMergeStats* stats) override;
 
     // We can't use WaitForFile during first-stage init, because ueventd is not
     // running and therefore will not automatically create symlinks. Instead,
@@ -640,6 +644,7 @@
     MergeFailureCode CheckMergeConsistency(LockedFile* lock, const std::string& name,
                                            const SnapshotStatus& update_status);
 
+    auto UpdateStateToStr(enum UpdateState state);
     // Get status or table information about a device-mapper node with a single target.
     enum class TableQuery {
         Table,
diff --git a/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stats.h b/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stats.h
index 8c2fec7..8a70400 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stats.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stats.h
@@ -28,10 +28,7 @@
     virtual ~ISnapshotMergeStats() = default;
     // Called when merge starts or resumes.
     virtual bool Start() = 0;
-    virtual void set_state(android::snapshot::UpdateState state, bool using_compression) = 0;
-    virtual void set_cow_file_size(uint64_t cow_file_size) = 0;
-    virtual void set_total_cow_size_bytes(uint64_t bytes) = 0;
-    virtual void set_estimated_cow_size_bytes(uint64_t bytes) = 0;
+    virtual void set_state(android::snapshot::UpdateState state) = 0;
     virtual void set_boot_complete_time_ms(uint32_t ms) = 0;
     virtual void set_boot_complete_to_merge_start_time_ms(uint32_t ms) = 0;
     virtual void set_merge_failure_code(MergeFailureCode code) = 0;
@@ -55,6 +52,9 @@
     // Return nullptr if any failure.
     virtual std::unique_ptr<Result> Finish() = 0;
 
+    // Return the underlying implementation.
+    virtual SnapshotMergeReport* report() = 0;
+
     // Write out the current state. This should be called when data might be lost that
     // cannot be recovered (eg the COW sizes).
     virtual bool WriteState() = 0;
@@ -67,11 +67,8 @@
 
     // ISnapshotMergeStats overrides
     bool Start() override;
-    void set_state(android::snapshot::UpdateState state, bool using_compression) override;
-    void set_cow_file_size(uint64_t cow_file_size) override;
+    void set_state(android::snapshot::UpdateState state) override;
     uint64_t cow_file_size() override;
-    void set_total_cow_size_bytes(uint64_t bytes) override;
-    void set_estimated_cow_size_bytes(uint64_t bytes) override;
     uint64_t total_cow_size_bytes() override;
     uint64_t estimated_cow_size_bytes() override;
     void set_boot_complete_time_ms(uint32_t ms) override;
@@ -85,6 +82,9 @@
     std::unique_ptr<Result> Finish() override;
     bool WriteState() override;
 
+    // Access the underlying report before it is finished.
+    SnapshotMergeReport* report() override { return &report_; }
+
   private:
     bool ReadState();
     bool DeleteState();
diff --git a/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stub.h b/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stub.h
index 318e525..171c7c6 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stub.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stub.h
@@ -59,6 +59,7 @@
     bool MapAllSnapshots(const std::chrono::milliseconds& timeout_ms) override;
     bool UnmapAllSnapshots() override;
     std::string ReadSourceBuildFingerprint() override;
+    void SetMergeStatsFeatures(ISnapshotMergeStats* stats) override;
 };
 
 }  // namespace android::snapshot
diff --git a/fs_mgr/libsnapshot/include/libsnapshot/snapshot_writer.h b/fs_mgr/libsnapshot/include/libsnapshot/snapshot_writer.h
index 545f117..0e3b1db 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/snapshot_writer.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/snapshot_writer.h
@@ -74,7 +74,7 @@
     bool VerifyMergeOps() const noexcept;
 
   protected:
-    bool EmitCopy(uint64_t new_block, uint64_t old_block) override;
+    bool EmitCopy(uint64_t new_block, uint64_t old_block, uint64_t num_blocks = 1) override;
     bool EmitRawBlocks(uint64_t new_block_start, const void* data, size_t size) override;
     bool EmitXorBlocks(uint32_t new_block_start, const void* data, size_t size, uint32_t old_block,
                        uint16_t offset) override;
@@ -113,7 +113,7 @@
     bool EmitZeroBlocks(uint64_t new_block_start, uint64_t num_blocks) override;
     bool EmitXorBlocks(uint32_t new_block_start, const void* data, size_t size, uint32_t old_block,
                        uint16_t offset) override;
-    bool EmitCopy(uint64_t new_block, uint64_t old_block) override;
+    bool EmitCopy(uint64_t new_block, uint64_t old_block, uint64_t num_blocks = 1) override;
     bool EmitLabel(uint64_t label) override;
     bool EmitSequenceData(size_t num_ops, const uint32_t* data) override;
 
diff --git a/fs_mgr/libsnapshot/include_test/libsnapshot/test_helpers.h b/fs_mgr/libsnapshot/include_test/libsnapshot/test_helpers.h
index c3b40dc..24c91a8 100644
--- a/fs_mgr/libsnapshot/include_test/libsnapshot/test_helpers.h
+++ b/fs_mgr/libsnapshot/include_test/libsnapshot/test_helpers.h
@@ -17,10 +17,10 @@
 #include <memory>
 #include <optional>
 #include <string>
+#include <unordered_map>
 #include <unordered_set>
 
 #include <android-base/file.h>
-#include <android/hardware/boot/1.1/IBootControl.h>
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
 #include <libfiemap/image_manager.h>
@@ -33,10 +33,10 @@
 namespace android {
 namespace snapshot {
 
+using aidl::android::hardware::boot::MergeStatus;
 using android::fs_mgr::IPropertyFetcher;
 using android::fs_mgr::MetadataBuilder;
 using android::fs_mgr::testing::MockPropertyFetcher;
-using android::hardware::boot::V1_1::MergeStatus;
 using chromeos_update_engine::DeltaArchiveManifest;
 using chromeos_update_engine::PartitionUpdate;
 using testing::_;
@@ -143,6 +143,9 @@
     virtual DmDeviceState GetState(const std::string& name) const override {
         return impl_.GetState(name);
     }
+    virtual bool LoadTable(const std::string& name, const DmTable& table) {
+        return impl_.LoadTable(name, table);
+    }
     virtual bool LoadTableAndActivate(const std::string& name, const DmTable& table) {
         return impl_.LoadTableAndActivate(name, table);
     }
@@ -166,27 +169,25 @@
     android::dm::IDeviceMapper& impl_;
 };
 
-class SnapshotTestPropertyFetcher : public android::fs_mgr::testing::MockPropertyFetcher {
+class SnapshotTestPropertyFetcher : public android::fs_mgr::IPropertyFetcher {
   public:
-    SnapshotTestPropertyFetcher(const std::string& slot_suffix) {
-        using testing::Return;
-        ON_CALL(*this, GetProperty("ro.boot.slot_suffix", _)).WillByDefault(Return(slot_suffix));
-        ON_CALL(*this, GetBoolProperty("ro.boot.dynamic_partitions", _))
-                .WillByDefault(Return(true));
-        ON_CALL(*this, GetBoolProperty("ro.boot.dynamic_partitions_retrofit", _))
-                .WillByDefault(Return(false));
-        ON_CALL(*this, GetBoolProperty("ro.virtual_ab.enabled", _)).WillByDefault(Return(true));
-    }
+    explicit SnapshotTestPropertyFetcher(const std::string& slot_suffix,
+                                         std::unordered_map<std::string, std::string>&& props = {});
+
+    std::string GetProperty(const std::string& key, const std::string& defaultValue) override;
+    bool GetBoolProperty(const std::string& key, bool defaultValue) override;
 
     static void SetUp(const std::string& slot_suffix = "_a") { Reset(slot_suffix); }
-
     static void TearDown() { Reset("_a"); }
 
   private:
     static void Reset(const std::string& slot_suffix) {
         IPropertyFetcher::OverrideForTesting(
-                std::make_unique<NiceMock<SnapshotTestPropertyFetcher>>(slot_suffix));
+                std::make_unique<SnapshotTestPropertyFetcher>(slot_suffix));
     }
+
+  private:
+    std::unordered_map<std::string, std::string> properties_;
 };
 
 // Helper for error-spam-free cleanup.
@@ -197,9 +198,10 @@
 // Expect space of |path| is multiple of 4K.
 bool WriteRandomData(const std::string& path, std::optional<size_t> expect_size = std::nullopt,
                      std::string* hash = nullptr);
-bool WriteRandomData(ICowWriter* writer, std::string* hash = nullptr);
 std::string HashSnapshot(ISnapshotWriter* writer);
 
+std::string ToHexString(const uint8_t* buf, size_t len);
+
 std::optional<std::string> GetHash(const std::string& path);
 
 // Add partitions and groups described by |manifest|.
diff --git a/fs_mgr/libsnapshot/cow_api_test.cpp b/fs_mgr/libsnapshot/libsnapshot_cow/cow_api_test.cpp
similarity index 86%
rename from fs_mgr/libsnapshot/cow_api_test.cpp
rename to fs_mgr/libsnapshot/libsnapshot_cow/cow_api_test.cpp
index ba4044f..862ce55 100644
--- a/fs_mgr/libsnapshot/cow_api_test.cpp
+++ b/fs_mgr/libsnapshot/libsnapshot_cow/cow_api_test.cpp
@@ -62,6 +62,48 @@
     std::string stream_;
 };
 
+TEST_F(CowTest, CopyContiguous) {
+    CowOptions options;
+    options.cluster_ops = 0;
+    CowWriter writer(options);
+
+    ASSERT_TRUE(writer.Initialize(cow_->fd));
+
+    ASSERT_TRUE(writer.AddCopy(10, 1000, 100));
+    ASSERT_TRUE(writer.Finalize());
+    ASSERT_EQ(lseek(cow_->fd, 0, SEEK_SET), 0);
+
+    CowReader reader;
+    CowHeader header;
+    CowFooter footer;
+    ASSERT_TRUE(reader.Parse(cow_->fd));
+    ASSERT_TRUE(reader.GetHeader(&header));
+    ASSERT_TRUE(reader.GetFooter(&footer));
+    ASSERT_EQ(header.magic, kCowMagicNumber);
+    ASSERT_EQ(header.major_version, kCowVersionMajor);
+    ASSERT_EQ(header.minor_version, kCowVersionMinor);
+    ASSERT_EQ(header.block_size, options.block_size);
+    ASSERT_EQ(footer.op.num_ops, 100);
+
+    auto iter = reader.GetOpIter();
+    ASSERT_NE(iter, nullptr);
+    ASSERT_FALSE(iter->Done());
+
+    size_t i = 0;
+    while (!iter->Done()) {
+        auto op = &iter->Get();
+        ASSERT_EQ(op->type, kCowCopyOp);
+        ASSERT_EQ(op->compression, kCowCompressNone);
+        ASSERT_EQ(op->data_length, 0);
+        ASSERT_EQ(op->new_block, 10 + i);
+        ASSERT_EQ(op->source, 1000 + i);
+        iter->Next();
+        i += 1;
+    }
+
+    ASSERT_EQ(i, 100);
+}
+
 TEST_F(CowTest, ReadWrite) {
     CowOptions options;
     options.cluster_ops = 0;
@@ -256,6 +298,150 @@
     ASSERT_TRUE(iter->Done());
 }
 
+class CompressionRWTest : public CowTest, public testing::WithParamInterface<const char*> {};
+
+TEST_P(CompressionRWTest, ThreadedBatchWrites) {
+    CowOptions options;
+    options.compression = GetParam();
+    options.num_compress_threads = 2;
+
+    CowWriter writer(options);
+
+    ASSERT_TRUE(writer.Initialize(cow_->fd));
+
+    std::string xor_data = "This is test data-1. Testing xor";
+    xor_data.resize(options.block_size, '\0');
+    ASSERT_TRUE(writer.AddXorBlocks(50, xor_data.data(), xor_data.size(), 24, 10));
+
+    std::string data = "This is test data-2. Testing replace ops";
+    data.resize(options.block_size * 2048, '\0');
+    ASSERT_TRUE(writer.AddRawBlocks(100, data.data(), data.size()));
+
+    std::string data2 = "This is test data-3. Testing replace ops";
+    data2.resize(options.block_size * 259, '\0');
+    ASSERT_TRUE(writer.AddRawBlocks(6000, data2.data(), data2.size()));
+
+    std::string data3 = "This is test data-4. Testing replace ops";
+    data3.resize(options.block_size, '\0');
+    ASSERT_TRUE(writer.AddRawBlocks(9000, data3.data(), data3.size()));
+
+    ASSERT_TRUE(writer.Finalize());
+
+    int expected_blocks = (1 + 2048 + 259 + 1);
+    ASSERT_EQ(lseek(cow_->fd, 0, SEEK_SET), 0);
+
+    CowReader reader;
+    ASSERT_TRUE(reader.Parse(cow_->fd));
+
+    auto iter = reader.GetOpIter();
+    ASSERT_NE(iter, nullptr);
+
+    int total_blocks = 0;
+    while (!iter->Done()) {
+        auto op = &iter->Get();
+
+        if (op->type == kCowXorOp) {
+            total_blocks += 1;
+            StringSink sink;
+            ASSERT_EQ(op->new_block, 50);
+            ASSERT_EQ(op->source, 98314);  // 4096 * 24 + 10
+            ASSERT_TRUE(reader.ReadData(*op, &sink));
+            ASSERT_EQ(sink.stream(), xor_data);
+        }
+
+        if (op->type == kCowReplaceOp) {
+            total_blocks += 1;
+            if (op->new_block == 100) {
+                StringSink sink;
+                ASSERT_TRUE(reader.ReadData(*op, &sink));
+                data.resize(options.block_size);
+                ASSERT_EQ(sink.stream(), data);
+            }
+            if (op->new_block == 6000) {
+                StringSink sink;
+                ASSERT_TRUE(reader.ReadData(*op, &sink));
+                data2.resize(options.block_size);
+                ASSERT_EQ(sink.stream(), data2);
+            }
+            if (op->new_block == 9000) {
+                StringSink sink;
+                ASSERT_TRUE(reader.ReadData(*op, &sink));
+                ASSERT_EQ(sink.stream(), data3);
+            }
+        }
+
+        iter->Next();
+    }
+
+    ASSERT_EQ(total_blocks, expected_blocks);
+}
+
+TEST_P(CompressionRWTest, NoBatchWrites) {
+    CowOptions options;
+    options.compression = GetParam();
+    options.num_compress_threads = 1;
+    options.cluster_ops = 0;
+
+    CowWriter writer(options);
+
+    ASSERT_TRUE(writer.Initialize(cow_->fd));
+
+    std::string data = "Testing replace ops without batch writes";
+    data.resize(options.block_size * 1024, '\0');
+    ASSERT_TRUE(writer.AddRawBlocks(50, data.data(), data.size()));
+
+    std::string data2 = "Testing odd blocks without batch writes";
+    data2.resize(options.block_size * 111, '\0');
+    ASSERT_TRUE(writer.AddRawBlocks(3000, data2.data(), data2.size()));
+
+    std::string data3 = "Testing single 4k block";
+    data3.resize(options.block_size, '\0');
+    ASSERT_TRUE(writer.AddRawBlocks(5000, data3.data(), data3.size()));
+
+    ASSERT_TRUE(writer.Finalize());
+
+    int expected_blocks = (1024 + 111 + 1);
+    ASSERT_EQ(lseek(cow_->fd, 0, SEEK_SET), 0);
+
+    CowReader reader;
+    ASSERT_TRUE(reader.Parse(cow_->fd));
+
+    auto iter = reader.GetOpIter();
+    ASSERT_NE(iter, nullptr);
+
+    int total_blocks = 0;
+    while (!iter->Done()) {
+        auto op = &iter->Get();
+
+        if (op->type == kCowReplaceOp) {
+            total_blocks += 1;
+            if (op->new_block == 50) {
+                StringSink sink;
+                ASSERT_TRUE(reader.ReadData(*op, &sink));
+                data.resize(options.block_size);
+                ASSERT_EQ(sink.stream(), data);
+            }
+            if (op->new_block == 3000) {
+                StringSink sink;
+                ASSERT_TRUE(reader.ReadData(*op, &sink));
+                data2.resize(options.block_size);
+                ASSERT_EQ(sink.stream(), data2);
+            }
+            if (op->new_block == 5000) {
+                StringSink sink;
+                ASSERT_TRUE(reader.ReadData(*op, &sink));
+                ASSERT_EQ(sink.stream(), data3);
+            }
+        }
+
+        iter->Next();
+    }
+
+    ASSERT_EQ(total_blocks, expected_blocks);
+}
+
+INSTANTIATE_TEST_SUITE_P(CowApi, CompressionRWTest, testing::Values("none", "gz", "brotli", "lz4"));
+
 TEST_F(CowTest, ClusterCompressGz) {
     CowOptions options;
     options.compression = "gz";
diff --git a/fs_mgr/libsnapshot/libsnapshot_cow/cow_compress.cpp b/fs_mgr/libsnapshot/libsnapshot_cow/cow_compress.cpp
new file mode 100644
index 0000000..4d9b748
--- /dev/null
+++ b/fs_mgr/libsnapshot/libsnapshot_cow/cow_compress.cpp
@@ -0,0 +1,218 @@
+//
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <limits>
+#include <queue>
+
+#include <android-base/file.h>
+#include <android-base/logging.h>
+#include <android-base/unique_fd.h>
+#include <brotli/encode.h>
+#include <libsnapshot/cow_format.h>
+#include <libsnapshot/cow_reader.h>
+#include <libsnapshot/cow_writer.h>
+#include <lz4.h>
+#include <zlib.h>
+
+namespace android {
+namespace snapshot {
+
+std::basic_string<uint8_t> CompressWorker::Compress(const void* data, size_t length) {
+    switch (compression_) {
+        case kCowCompressGz: {
+            const auto bound = compressBound(length);
+            std::basic_string<uint8_t> buffer(bound, '\0');
+
+            uLongf dest_len = bound;
+            auto rv = compress2(buffer.data(), &dest_len, reinterpret_cast<const Bytef*>(data),
+                                length, Z_BEST_COMPRESSION);
+            if (rv != Z_OK) {
+                LOG(ERROR) << "compress2 returned: " << rv;
+                return {};
+            }
+            buffer.resize(dest_len);
+            return buffer;
+        }
+        case kCowCompressBrotli: {
+            const auto bound = BrotliEncoderMaxCompressedSize(length);
+            if (!bound) {
+                LOG(ERROR) << "BrotliEncoderMaxCompressedSize returned 0";
+                return {};
+            }
+            std::basic_string<uint8_t> buffer(bound, '\0');
+
+            size_t encoded_size = bound;
+            auto rv = BrotliEncoderCompress(
+                    BROTLI_DEFAULT_QUALITY, BROTLI_DEFAULT_WINDOW, BROTLI_DEFAULT_MODE, length,
+                    reinterpret_cast<const uint8_t*>(data), &encoded_size, buffer.data());
+            if (!rv) {
+                LOG(ERROR) << "BrotliEncoderCompress failed";
+                return {};
+            }
+            buffer.resize(encoded_size);
+            return buffer;
+        }
+        case kCowCompressLz4: {
+            const auto bound = LZ4_compressBound(length);
+            if (!bound) {
+                LOG(ERROR) << "LZ4_compressBound returned 0";
+                return {};
+            }
+            std::basic_string<uint8_t> buffer(bound, '\0');
+
+            const auto compressed_size = LZ4_compress_default(
+                    static_cast<const char*>(data), reinterpret_cast<char*>(buffer.data()), length,
+                    buffer.size());
+            if (compressed_size <= 0) {
+                LOG(ERROR) << "LZ4_compress_default failed, input size: " << length
+                           << ", compression bound: " << bound << ", ret: " << compressed_size;
+                return {};
+            }
+            // Don't run compression if the compressed output is larger
+            if (compressed_size >= length) {
+                buffer.resize(length);
+                memcpy(buffer.data(), data, length);
+            } else {
+                buffer.resize(compressed_size);
+            }
+            return buffer;
+        }
+        default:
+            LOG(ERROR) << "unhandled compression type: " << compression_;
+            break;
+    }
+    return {};
+}
+
+bool CompressWorker::CompressBlocks(const void* buffer, size_t num_blocks,
+                                    std::vector<std::basic_string<uint8_t>>* compressed_data) {
+    const uint8_t* iter = reinterpret_cast<const uint8_t*>(buffer);
+    while (num_blocks) {
+        auto data = Compress(iter, block_size_);
+        if (data.empty()) {
+            PLOG(ERROR) << "CompressBlocks: Compression failed";
+            return false;
+        }
+        if (data.size() > std::numeric_limits<uint16_t>::max()) {
+            LOG(ERROR) << "Compressed block is too large: " << data.size();
+            return false;
+        }
+
+        compressed_data->emplace_back(std::move(data));
+        num_blocks -= 1;
+        iter += block_size_;
+    }
+    return true;
+}
+
+bool CompressWorker::RunThread() {
+    while (true) {
+        // Wait for work
+        CompressWork blocks;
+        {
+            std::unique_lock<std::mutex> lock(lock_);
+            while (work_queue_.empty() && !stopped_) {
+                cv_.wait(lock);
+            }
+
+            if (stopped_) {
+                return true;
+            }
+
+            blocks = std::move(work_queue_.front());
+            work_queue_.pop();
+        }
+
+        // Compress blocks
+        bool ret = CompressBlocks(blocks.buffer, blocks.num_blocks, &blocks.compressed_data);
+        blocks.compression_status = ret;
+        {
+            std::lock_guard<std::mutex> lock(lock_);
+            compressed_queue_.push(std::move(blocks));
+        }
+
+        // Notify completion
+        cv_.notify_all();
+
+        if (!ret) {
+            LOG(ERROR) << "CompressBlocks failed";
+            return false;
+        }
+    }
+
+    return true;
+}
+
+void CompressWorker::EnqueueCompressBlocks(const void* buffer, size_t num_blocks) {
+    {
+        std::lock_guard<std::mutex> lock(lock_);
+
+        CompressWork blocks = {};
+        blocks.buffer = buffer;
+        blocks.num_blocks = num_blocks;
+        work_queue_.push(std::move(blocks));
+    }
+    cv_.notify_all();
+}
+
+bool CompressWorker::GetCompressedBuffers(std::vector<std::basic_string<uint8_t>>* compressed_buf) {
+    {
+        std::unique_lock<std::mutex> lock(lock_);
+        while (compressed_queue_.empty() && !stopped_) {
+            cv_.wait(lock);
+        }
+
+        if (stopped_) {
+            return true;
+        }
+    }
+
+    {
+        std::lock_guard<std::mutex> lock(lock_);
+        while (compressed_queue_.size() > 0) {
+            CompressWork blocks = std::move(compressed_queue_.front());
+            compressed_queue_.pop();
+
+            if (blocks.compression_status) {
+                compressed_buf->insert(compressed_buf->end(),
+                                       std::make_move_iterator(blocks.compressed_data.begin()),
+                                       std::make_move_iterator(blocks.compressed_data.end()));
+            } else {
+                LOG(ERROR) << "Block compression failed";
+                return false;
+            }
+        }
+    }
+
+    return true;
+}
+
+void CompressWorker::Finalize() {
+    {
+        std::unique_lock<std::mutex> lock(lock_);
+        stopped_ = true;
+    }
+    cv_.notify_all();
+}
+
+CompressWorker::CompressWorker(CowCompressionAlgorithm compression, uint32_t block_size)
+    : compression_(compression), block_size_(block_size) {}
+
+}  // namespace snapshot
+}  // namespace android
diff --git a/fs_mgr/libsnapshot/cow_decompress.cpp b/fs_mgr/libsnapshot/libsnapshot_cow/cow_decompress.cpp
similarity index 77%
rename from fs_mgr/libsnapshot/cow_decompress.cpp
rename to fs_mgr/libsnapshot/libsnapshot_cow/cow_decompress.cpp
index faceafe..139a29f 100644
--- a/fs_mgr/libsnapshot/cow_decompress.cpp
+++ b/fs_mgr/libsnapshot/libsnapshot_cow/cow_decompress.cpp
@@ -20,6 +20,7 @@
 
 #include <android-base/logging.h>
 #include <brotli/decode.h>
+#include <lz4.h>
 #include <zlib.h>
 
 namespace android {
@@ -260,5 +261,55 @@
     return std::unique_ptr<IDecompressor>(new BrotliDecompressor());
 }
 
+class Lz4Decompressor final : public IDecompressor {
+  public:
+    ~Lz4Decompressor() override = default;
+
+    bool Decompress(const size_t output_size) override {
+        size_t actual_buffer_size = 0;
+        auto&& output_buffer = sink_->GetBuffer(output_size, &actual_buffer_size);
+        if (actual_buffer_size != output_size) {
+            LOG(ERROR) << "Failed to allocate buffer of size " << output_size << " only got "
+                       << actual_buffer_size << " bytes";
+            return false;
+        }
+        // If input size is same as output size, then input is uncompressed.
+        if (stream_->Size() == output_size) {
+            size_t bytes_read = 0;
+            stream_->Read(output_buffer, output_size, &bytes_read);
+            if (bytes_read != output_size) {
+                LOG(ERROR) << "Failed to read all input at once. Expected: " << output_size
+                           << " actual: " << bytes_read;
+                return false;
+            }
+            sink_->ReturnData(output_buffer, output_size);
+            return true;
+        }
+        std::string input_buffer;
+        input_buffer.resize(stream_->Size());
+        size_t bytes_read = 0;
+        stream_->Read(input_buffer.data(), input_buffer.size(), &bytes_read);
+        if (bytes_read != input_buffer.size()) {
+            LOG(ERROR) << "Failed to read all input at once. Expected: " << input_buffer.size()
+                       << " actual: " << bytes_read;
+            return false;
+        }
+        const int bytes_decompressed =
+                LZ4_decompress_safe(input_buffer.data(), static_cast<char*>(output_buffer),
+                                    input_buffer.size(), output_size);
+        if (bytes_decompressed != output_size) {
+            LOG(ERROR) << "Failed to decompress LZ4 block, expected output size: " << output_size
+                       << ", actual: " << bytes_decompressed;
+            return false;
+        }
+        sink_->ReturnData(output_buffer, output_size);
+        return true;
+    }
+};
+
+std::unique_ptr<IDecompressor> IDecompressor::Lz4() {
+    return std::make_unique<Lz4Decompressor>();
+}
+
 }  // namespace snapshot
 }  // namespace android
diff --git a/fs_mgr/libsnapshot/cow_decompress.h b/fs_mgr/libsnapshot/libsnapshot_cow/cow_decompress.h
similarity index 96%
rename from fs_mgr/libsnapshot/cow_decompress.h
rename to fs_mgr/libsnapshot/libsnapshot_cow/cow_decompress.h
index f485256..7f74eda 100644
--- a/fs_mgr/libsnapshot/cow_decompress.h
+++ b/fs_mgr/libsnapshot/libsnapshot_cow/cow_decompress.h
@@ -41,6 +41,7 @@
     static std::unique_ptr<IDecompressor> Uncompressed();
     static std::unique_ptr<IDecompressor> Gz();
     static std::unique_ptr<IDecompressor> Brotli();
+    static std::unique_ptr<IDecompressor> Lz4();
 
     // |output_bytes| is the expected total number of bytes to sink.
     virtual bool Decompress(size_t output_bytes) = 0;
diff --git a/fs_mgr/libsnapshot/cow_format.cpp b/fs_mgr/libsnapshot/libsnapshot_cow/cow_format.cpp
similarity index 100%
rename from fs_mgr/libsnapshot/cow_format.cpp
rename to fs_mgr/libsnapshot/libsnapshot_cow/cow_format.cpp
diff --git a/fs_mgr/libsnapshot/cow_reader.cpp b/fs_mgr/libsnapshot/libsnapshot_cow/cow_reader.cpp
similarity index 95%
rename from fs_mgr/libsnapshot/cow_reader.cpp
rename to fs_mgr/libsnapshot/libsnapshot_cow/cow_reader.cpp
index 75a58a6..45be191 100644
--- a/fs_mgr/libsnapshot/cow_reader.cpp
+++ b/fs_mgr/libsnapshot/libsnapshot_cow/cow_reader.cpp
@@ -34,12 +34,13 @@
 namespace android {
 namespace snapshot {
 
-CowReader::CowReader(ReaderFlags reader_flag)
+CowReader::CowReader(ReaderFlags reader_flag, bool is_merge)
     : fd_(-1),
       header_(),
       fd_size_(0),
       block_pos_index_(std::make_shared<std::vector<int>>()),
-      reader_flag_(reader_flag) {}
+      reader_flag_(reader_flag),
+      is_merge_(is_merge) {}
 
 static void SHA256(const void*, size_t, uint8_t[]) {
 #if 0
@@ -64,6 +65,7 @@
     cow->has_seq_ops_ = has_seq_ops_;
     cow->data_loc_ = data_loc_;
     cow->block_pos_index_ = block_pos_index_;
+    cow->is_merge_ = is_merge_;
     return cow;
 }
 
@@ -476,15 +478,28 @@
 
     merge_op_blocks->insert(merge_op_blocks->end(), other_ops.begin(), other_ops.end());
 
-    for (auto block : *merge_op_blocks) {
-        block_pos_index_->push_back(block_map->at(block));
-    }
-
     num_total_data_ops_ = merge_op_blocks->size();
     if (header_.num_merge_ops > 0) {
         merge_op_start_ = header_.num_merge_ops;
     }
 
+    if (is_merge_) {
+        // Metadata ops are not required for merge. Thus, just re-arrange
+        // the ops vector as required for merge operations.
+        auto merge_ops_buffer = std::make_shared<std::vector<CowOperation>>();
+        merge_ops_buffer->reserve(num_total_data_ops_);
+        for (auto block : *merge_op_blocks) {
+            merge_ops_buffer->emplace_back(ops_->data()[block_map->at(block)]);
+        }
+        ops_->clear();
+        ops_ = merge_ops_buffer;
+        ops_->shrink_to_fit();
+    } else {
+        for (auto block : *merge_op_blocks) {
+            block_pos_index_->push_back(block_map->at(block));
+        }
+    }
+
     block_map->clear();
     merge_op_blocks->clear();
 
@@ -548,7 +563,7 @@
 
 class CowOpIter final : public ICowOpIter {
   public:
-    CowOpIter(std::shared_ptr<std::vector<CowOperation>>& ops);
+    CowOpIter(std::shared_ptr<std::vector<CowOperation>>& ops, uint64_t start);
 
     bool Done() override;
     const CowOperation& Get() override;
@@ -562,9 +577,9 @@
     std::vector<CowOperation>::iterator op_iter_;
 };
 
-CowOpIter::CowOpIter(std::shared_ptr<std::vector<CowOperation>>& ops) {
+CowOpIter::CowOpIter(std::shared_ptr<std::vector<CowOperation>>& ops, uint64_t start) {
     ops_ = ops;
-    op_iter_ = ops_->begin();
+    op_iter_ = ops_->begin() + start;
 }
 
 bool CowOpIter::RDone() {
@@ -691,8 +706,8 @@
     return ops_->data()[*block_riter_];
 }
 
-std::unique_ptr<ICowOpIter> CowReader::GetOpIter() {
-    return std::make_unique<CowOpIter>(ops_);
+std::unique_ptr<ICowOpIter> CowReader::GetOpIter(bool merge_progress) {
+    return std::make_unique<CowOpIter>(ops_, merge_progress ? merge_op_start_ : 0);
 }
 
 std::unique_ptr<ICowOpIter> CowReader::GetRevMergeOpIter(bool ignore_progress) {
@@ -767,6 +782,9 @@
         case kCowCompressBrotli:
             decompressor = IDecompressor::Brotli();
             break;
+        case kCowCompressLz4:
+            decompressor = IDecompressor::Lz4();
+            break;
         default:
             LOG(ERROR) << "Unknown compression type: " << op.compression;
             return false;
diff --git a/fs_mgr/libsnapshot/libsnapshot_cow/cow_writer.cpp b/fs_mgr/libsnapshot/libsnapshot_cow/cow_writer.cpp
new file mode 100644
index 0000000..2d5e4bc
--- /dev/null
+++ b/fs_mgr/libsnapshot/libsnapshot_cow/cow_writer.cpp
@@ -0,0 +1,835 @@
+//
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#include <sys/types.h>
+#include <sys/uio.h>
+#include <unistd.h>
+
+#include <limits>
+#include <queue>
+
+#include <android-base/file.h>
+#include <android-base/logging.h>
+#include <android-base/properties.h>
+#include <android-base/unique_fd.h>
+#include <brotli/encode.h>
+#include <libsnapshot/cow_format.h>
+#include <libsnapshot/cow_reader.h>
+#include <libsnapshot/cow_writer.h>
+#include <lz4.h>
+#include <zlib.h>
+
+#include <fcntl.h>
+#include <linux/fs.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+namespace android {
+namespace snapshot {
+
+namespace {
+std::string GetFdPath(int fd) {
+    const auto fd_path = "/proc/self/fd/" + std::to_string(fd);
+    std::string file_path(512, '\0');
+    const auto err = readlink(fd_path.c_str(), file_path.data(), file_path.size());
+    if (err <= 0) {
+        PLOG(ERROR) << "Failed to determine path for fd " << fd;
+        file_path.clear();
+    } else {
+        file_path.resize(err);
+    }
+    return file_path;
+}
+}  // namespace
+
+static_assert(sizeof(off_t) == sizeof(uint64_t));
+
+using android::base::borrowed_fd;
+using android::base::unique_fd;
+
+bool ICowWriter::AddCopy(uint64_t new_block, uint64_t old_block, uint64_t num_blocks) {
+    CHECK(num_blocks != 0);
+
+    for (size_t i = 0; i < num_blocks; i++) {
+        if (!ValidateNewBlock(new_block + i)) {
+            return false;
+        }
+    }
+
+    return EmitCopy(new_block, old_block, num_blocks);
+}
+
+bool ICowWriter::AddRawBlocks(uint64_t new_block_start, const void* data, size_t size) {
+    if (size % options_.block_size != 0) {
+        LOG(ERROR) << "AddRawBlocks: size " << size << " is not a multiple of "
+                   << options_.block_size;
+        return false;
+    }
+
+    uint64_t num_blocks = size / options_.block_size;
+    uint64_t last_block = new_block_start + num_blocks - 1;
+    if (!ValidateNewBlock(last_block)) {
+        return false;
+    }
+    return EmitRawBlocks(new_block_start, data, size);
+}
+
+bool ICowWriter::AddXorBlocks(uint32_t new_block_start, const void* data, size_t size,
+                              uint32_t old_block, uint16_t offset) {
+    if (size % options_.block_size != 0) {
+        LOG(ERROR) << "AddRawBlocks: size " << size << " is not a multiple of "
+                   << options_.block_size;
+        return false;
+    }
+
+    uint64_t num_blocks = size / options_.block_size;
+    uint64_t last_block = new_block_start + num_blocks - 1;
+    if (!ValidateNewBlock(last_block)) {
+        return false;
+    }
+    if (offset >= options_.block_size) {
+        LOG(ERROR) << "AddXorBlocks: offset " << offset << " is not less than "
+                   << options_.block_size;
+    }
+    return EmitXorBlocks(new_block_start, data, size, old_block, offset);
+}
+
+bool ICowWriter::AddZeroBlocks(uint64_t new_block_start, uint64_t num_blocks) {
+    uint64_t last_block = new_block_start + num_blocks - 1;
+    if (!ValidateNewBlock(last_block)) {
+        return false;
+    }
+    return EmitZeroBlocks(new_block_start, num_blocks);
+}
+
+bool ICowWriter::AddLabel(uint64_t label) {
+    return EmitLabel(label);
+}
+
+bool ICowWriter::AddSequenceData(size_t num_ops, const uint32_t* data) {
+    return EmitSequenceData(num_ops, data);
+}
+
+bool ICowWriter::ValidateNewBlock(uint64_t new_block) {
+    if (options_.max_blocks && new_block >= options_.max_blocks.value()) {
+        LOG(ERROR) << "New block " << new_block << " exceeds maximum block count "
+                   << options_.max_blocks.value();
+        return false;
+    }
+    return true;
+}
+
+CowWriter::CowWriter(const CowOptions& options) : ICowWriter(options), fd_(-1) {
+    SetupHeaders();
+    SetupWriteOptions();
+}
+
+CowWriter::~CowWriter() {
+    for (size_t i = 0; i < compress_threads_.size(); i++) {
+        CompressWorker* worker = compress_threads_[i].get();
+        if (worker) {
+            worker->Finalize();
+        }
+    }
+
+    bool ret = true;
+    for (auto& t : threads_) {
+        ret = t.get() && ret;
+    }
+
+    if (!ret) {
+        LOG(ERROR) << "Compression failed";
+    }
+    compress_threads_.clear();
+}
+
+void CowWriter::SetupWriteOptions() {
+    num_compress_threads_ = options_.num_compress_threads;
+
+    if (!num_compress_threads_) {
+        num_compress_threads_ = 1;
+        // We prefer not to have more than two threads as the overhead of additional
+        // threads is far greater than cutting down compression time.
+        if (header_.cluster_ops &&
+            android::base::GetBoolProperty("ro.virtual_ab.compression.threads", false)) {
+            num_compress_threads_ = 2;
+        }
+    }
+
+    if (header_.cluster_ops &&
+        (android::base::GetBoolProperty("ro.virtual_ab.batch_writes", false) ||
+         options_.batch_write)) {
+        batch_write_ = true;
+    }
+}
+
+void CowWriter::SetupHeaders() {
+    header_ = {};
+    header_.magic = kCowMagicNumber;
+    header_.major_version = kCowVersionMajor;
+    header_.minor_version = kCowVersionMinor;
+    header_.header_size = sizeof(CowHeader);
+    header_.footer_size = sizeof(CowFooter);
+    header_.op_size = sizeof(CowOperation);
+    header_.block_size = options_.block_size;
+    header_.num_merge_ops = options_.num_merge_ops;
+    header_.cluster_ops = options_.cluster_ops;
+    header_.buffer_size = 0;
+    footer_ = {};
+    footer_.op.data_length = 64;
+    footer_.op.type = kCowFooterOp;
+}
+
+bool CowWriter::ParseOptions() {
+    if (options_.compression == "gz") {
+        compression_ = kCowCompressGz;
+    } else if (options_.compression == "brotli") {
+        compression_ = kCowCompressBrotli;
+    } else if (options_.compression == "lz4") {
+        compression_ = kCowCompressLz4;
+    } else if (options_.compression == "none") {
+        compression_ = kCowCompressNone;
+    } else if (!options_.compression.empty()) {
+        LOG(ERROR) << "unrecognized compression: " << options_.compression;
+        return false;
+    }
+    if (options_.cluster_ops == 1) {
+        LOG(ERROR) << "Clusters must contain at least two operations to function.";
+        return false;
+    }
+    return true;
+}
+
+bool CowWriter::SetFd(android::base::borrowed_fd fd) {
+    if (fd.get() < 0) {
+        owned_fd_.reset(open("/dev/null", O_RDWR | O_CLOEXEC));
+        if (owned_fd_ < 0) {
+            PLOG(ERROR) << "open /dev/null failed";
+            return false;
+        }
+        fd_ = owned_fd_;
+        is_dev_null_ = true;
+    } else {
+        fd_ = fd;
+
+        struct stat stat {};
+        if (fstat(fd.get(), &stat) < 0) {
+            PLOG(ERROR) << "fstat failed";
+            return false;
+        }
+        const auto file_path = GetFdPath(fd.get());
+        is_block_device_ = S_ISBLK(stat.st_mode);
+        if (is_block_device_) {
+            uint64_t size_in_bytes = 0;
+            if (ioctl(fd.get(), BLKGETSIZE64, &size_in_bytes)) {
+                PLOG(ERROR) << "Failed to get total size for: " << fd.get();
+                return false;
+            }
+            cow_image_size_ = size_in_bytes;
+            LOG(INFO) << "COW image " << file_path << " has size " << size_in_bytes;
+        } else {
+            LOG(INFO) << "COW image " << file_path
+                      << " is not a block device, assuming unlimited space.";
+        }
+    }
+    return true;
+}
+
+void CowWriter::InitBatchWrites() {
+    if (batch_write_) {
+        cowop_vec_ = std::make_unique<struct iovec[]>(header_.cluster_ops);
+        data_vec_ = std::make_unique<struct iovec[]>(header_.cluster_ops);
+        struct iovec* cowop_ptr = cowop_vec_.get();
+        struct iovec* data_ptr = data_vec_.get();
+        for (size_t i = 0; i < header_.cluster_ops; i++) {
+            std::unique_ptr<CowOperation> op = std::make_unique<CowOperation>();
+            cowop_ptr[i].iov_base = op.get();
+            cowop_ptr[i].iov_len = sizeof(CowOperation);
+            opbuffer_vec_.push_back(std::move(op));
+
+            std::unique_ptr<uint8_t[]> buffer = std::make_unique<uint8_t[]>(header_.block_size * 2);
+            data_ptr[i].iov_base = buffer.get();
+            data_ptr[i].iov_len = header_.block_size * 2;
+            databuffer_vec_.push_back(std::move(buffer));
+        }
+
+        current_op_pos_ = next_op_pos_;
+        current_data_pos_ = next_data_pos_;
+    }
+
+    std::string batch_write = batch_write_ ? "enabled" : "disabled";
+    LOG(INFO) << "Batch writes: " << batch_write;
+}
+
+void CowWriter::InitWorkers() {
+    for (int i = 0; i < num_compress_threads_; i++) {
+        auto wt = std::make_unique<CompressWorker>(compression_, header_.block_size);
+        threads_.emplace_back(std::async(std::launch::async, &CompressWorker::RunThread, wt.get()));
+        compress_threads_.push_back(std::move(wt));
+    }
+
+    LOG(INFO) << num_compress_threads_ << " thread used for compression";
+}
+
+bool CowWriter::Initialize(unique_fd&& fd) {
+    owned_fd_ = std::move(fd);
+    return Initialize(borrowed_fd{owned_fd_});
+}
+
+bool CowWriter::Initialize(borrowed_fd fd) {
+    if (!SetFd(fd) || !ParseOptions()) {
+        return false;
+    }
+
+    bool ret = OpenForWrite();
+
+    if (ret) {
+        InitWorkers();
+    }
+
+    return ret;
+}
+
+bool CowWriter::InitializeAppend(android::base::unique_fd&& fd, uint64_t label) {
+    owned_fd_ = std::move(fd);
+    return InitializeAppend(android::base::borrowed_fd{owned_fd_}, label);
+}
+
+bool CowWriter::InitializeAppend(android::base::borrowed_fd fd, uint64_t label) {
+    if (!SetFd(fd) || !ParseOptions()) {
+        return false;
+    }
+
+    bool ret = OpenForAppend(label);
+
+    if (ret && !compress_threads_.size()) {
+        InitWorkers();
+    }
+
+    return ret;
+}
+
+void CowWriter::InitPos() {
+    next_op_pos_ = sizeof(header_) + header_.buffer_size;
+    cluster_size_ = header_.cluster_ops * sizeof(CowOperation);
+    if (header_.cluster_ops) {
+        next_data_pos_ = next_op_pos_ + cluster_size_;
+    } else {
+        next_data_pos_ = next_op_pos_ + sizeof(CowOperation);
+    }
+    current_cluster_size_ = 0;
+    current_data_size_ = 0;
+}
+
+bool CowWriter::OpenForWrite() {
+    // This limitation is tied to the data field size in CowOperation.
+    if (header_.block_size > std::numeric_limits<uint16_t>::max()) {
+        LOG(ERROR) << "Block size is too large";
+        return false;
+    }
+
+    if (lseek(fd_.get(), 0, SEEK_SET) < 0) {
+        PLOG(ERROR) << "lseek failed";
+        return false;
+    }
+
+    if (options_.scratch_space) {
+        header_.buffer_size = BUFFER_REGION_DEFAULT_SIZE;
+    }
+
+    // Headers are not complete, but this ensures the file is at the right
+    // position.
+    if (!android::base::WriteFully(fd_, &header_, sizeof(header_))) {
+        PLOG(ERROR) << "write failed";
+        return false;
+    }
+
+    if (options_.scratch_space) {
+        // Initialize the scratch space
+        std::string data(header_.buffer_size, 0);
+        if (!android::base::WriteFully(fd_, data.data(), header_.buffer_size)) {
+            PLOG(ERROR) << "writing scratch space failed";
+            return false;
+        }
+    }
+
+    if (!Sync()) {
+        LOG(ERROR) << "Header sync failed";
+        return false;
+    }
+
+    if (lseek(fd_.get(), sizeof(header_) + header_.buffer_size, SEEK_SET) < 0) {
+        PLOG(ERROR) << "lseek failed";
+        return false;
+    }
+
+    InitPos();
+    InitBatchWrites();
+
+    return true;
+}
+
+bool CowWriter::OpenForAppend(uint64_t label) {
+    auto reader = std::make_unique<CowReader>();
+    std::queue<CowOperation> toAdd;
+
+    if (!reader->Parse(fd_, {label}) || !reader->GetHeader(&header_)) {
+        return false;
+    }
+
+    options_.block_size = header_.block_size;
+    options_.cluster_ops = header_.cluster_ops;
+
+    // Reset this, since we're going to reimport all operations.
+    footer_.op.num_ops = 0;
+    InitPos();
+
+    auto iter = reader->GetOpIter();
+
+    while (!iter->Done()) {
+        AddOperation(iter->Get());
+        iter->Next();
+    }
+
+    // Free reader so we own the descriptor position again.
+    reader = nullptr;
+
+    if (lseek(fd_.get(), next_op_pos_, SEEK_SET) < 0) {
+        PLOG(ERROR) << "lseek failed";
+        return false;
+    }
+
+    InitBatchWrites();
+
+    return EmitClusterIfNeeded();
+}
+
+bool CowWriter::EmitCopy(uint64_t new_block, uint64_t old_block, uint64_t num_blocks) {
+    CHECK(!merge_in_progress_);
+
+    for (size_t i = 0; i < num_blocks; i++) {
+        CowOperation op = {};
+        op.type = kCowCopyOp;
+        op.new_block = new_block + i;
+        op.source = old_block + i;
+        if (!WriteOperation(op)) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+bool CowWriter::EmitRawBlocks(uint64_t new_block_start, const void* data, size_t size) {
+    return EmitBlocks(new_block_start, data, size, 0, 0, kCowReplaceOp);
+}
+
+bool CowWriter::EmitXorBlocks(uint32_t new_block_start, const void* data, size_t size,
+                              uint32_t old_block, uint16_t offset) {
+    return EmitBlocks(new_block_start, data, size, old_block, offset, kCowXorOp);
+}
+
+bool CowWriter::CompressBlocks(size_t num_blocks, const void* data) {
+    size_t num_threads = (num_blocks == 1) ? 1 : num_compress_threads_;
+    size_t num_blocks_per_thread = num_blocks / num_threads;
+    const uint8_t* iter = reinterpret_cast<const uint8_t*>(data);
+    compressed_buf_.clear();
+
+    // Submit the blocks per thread. The retrieval of
+    // compressed buffers has to be done in the same order.
+    // We should not poll for completed buffers in a different order as the
+    // buffers are tightly coupled with block ordering.
+    for (size_t i = 0; i < num_threads; i++) {
+        CompressWorker* worker = compress_threads_[i].get();
+        if (i == num_threads - 1) {
+            num_blocks_per_thread = num_blocks;
+        }
+        worker->EnqueueCompressBlocks(iter, num_blocks_per_thread);
+        iter += (num_blocks_per_thread * header_.block_size);
+        num_blocks -= num_blocks_per_thread;
+    }
+
+    for (size_t i = 0; i < num_threads; i++) {
+        CompressWorker* worker = compress_threads_[i].get();
+        if (!worker->GetCompressedBuffers(&compressed_buf_)) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+bool CowWriter::EmitBlocks(uint64_t new_block_start, const void* data, size_t size,
+                           uint64_t old_block, uint16_t offset, uint8_t type) {
+    CHECK(!merge_in_progress_);
+    const uint8_t* iter = reinterpret_cast<const uint8_t*>(data);
+
+    // Update engine can potentially send 100MB of blocks at a time. We
+    // don't want to process all those blocks in one shot as it can
+    // stress the memory. Hence, process the blocks in chunks.
+    //
+    // 1024 blocks is reasonable given we will end up using max
+    // memory of ~4MB.
+    const size_t kProcessingBlocks = 1024;
+    size_t num_blocks = (size / header_.block_size);
+    size_t i = 0;
+
+    while (num_blocks) {
+        size_t pending_blocks = (std::min(kProcessingBlocks, num_blocks));
+
+        if (compression_) {
+            if (!CompressBlocks(pending_blocks, iter)) {
+                return false;
+            }
+            buf_iter_ = compressed_buf_.begin();
+            CHECK(pending_blocks == compressed_buf_.size());
+            iter += (pending_blocks * header_.block_size);
+        }
+
+        num_blocks -= pending_blocks;
+
+        while (i < size / header_.block_size && pending_blocks) {
+            CowOperation op = {};
+            op.new_block = new_block_start + i;
+            op.type = type;
+            if (type == kCowXorOp) {
+                op.source = (old_block + i) * header_.block_size + offset;
+            } else {
+                op.source = next_data_pos_;
+            }
+
+            if (compression_) {
+                auto data = std::move(*buf_iter_);
+                op.compression = compression_;
+                op.data_length = static_cast<uint16_t>(data.size());
+
+                if (!WriteOperation(op, data.data(), data.size())) {
+                    PLOG(ERROR) << "AddRawBlocks: write failed";
+                    return false;
+                }
+                buf_iter_++;
+            } else {
+                op.data_length = static_cast<uint16_t>(header_.block_size);
+                if (!WriteOperation(op, iter, header_.block_size)) {
+                    PLOG(ERROR) << "AddRawBlocks: write failed";
+                    return false;
+                }
+                iter += header_.block_size;
+            }
+
+            i += 1;
+            pending_blocks -= 1;
+        }
+
+        CHECK(pending_blocks == 0);
+    }
+    return true;
+}
+
+bool CowWriter::EmitZeroBlocks(uint64_t new_block_start, uint64_t num_blocks) {
+    CHECK(!merge_in_progress_);
+    for (uint64_t i = 0; i < num_blocks; i++) {
+        CowOperation op = {};
+        op.type = kCowZeroOp;
+        op.new_block = new_block_start + i;
+        op.source = 0;
+        WriteOperation(op);
+    }
+    return true;
+}
+
+bool CowWriter::EmitLabel(uint64_t label) {
+    CHECK(!merge_in_progress_);
+    CowOperation op = {};
+    op.type = kCowLabelOp;
+    op.source = label;
+    return WriteOperation(op) && Sync();
+}
+
+bool CowWriter::EmitSequenceData(size_t num_ops, const uint32_t* data) {
+    CHECK(!merge_in_progress_);
+    size_t to_add = 0;
+    size_t max_ops = (header_.block_size * 2) / sizeof(uint32_t);
+    while (num_ops > 0) {
+        CowOperation op = {};
+        op.type = kCowSequenceOp;
+        op.source = next_data_pos_;
+        to_add = std::min(num_ops, max_ops);
+        op.data_length = static_cast<uint16_t>(to_add * sizeof(uint32_t));
+        if (!WriteOperation(op, data, op.data_length)) {
+            PLOG(ERROR) << "AddSequenceData: write failed";
+            return false;
+        }
+        num_ops -= to_add;
+        data += to_add;
+    }
+    return true;
+}
+
+bool CowWriter::EmitCluster() {
+    CowOperation op = {};
+    op.type = kCowClusterOp;
+    // Next cluster starts after remainder of current cluster and the next data block.
+    op.source = current_data_size_ + cluster_size_ - current_cluster_size_ - sizeof(CowOperation);
+    return WriteOperation(op);
+}
+
+bool CowWriter::EmitClusterIfNeeded() {
+    // If there isn't room for another op and the cluster end op, end the current cluster
+    if (cluster_size_ && cluster_size_ < current_cluster_size_ + 2 * sizeof(CowOperation)) {
+        if (!EmitCluster()) return false;
+    }
+    return true;
+}
+
+// TODO: Fix compilation issues when linking libcrypto library
+// when snapuserd is compiled as part of ramdisk.
+static void SHA256(const void*, size_t, uint8_t[]) {
+#if 0
+    SHA256_CTX c;
+    SHA256_Init(&c);
+    SHA256_Update(&c, data, length);
+    SHA256_Final(out, &c);
+#endif
+}
+
+bool CowWriter::Finalize() {
+    if (!FlushCluster()) {
+        LOG(ERROR) << "Finalize: FlushCluster() failed";
+        return false;
+    }
+
+    auto continue_cluster_size = current_cluster_size_;
+    auto continue_data_size = current_data_size_;
+    auto continue_data_pos = next_data_pos_;
+    auto continue_op_pos = next_op_pos_;
+    auto continue_num_ops = footer_.op.num_ops;
+    bool extra_cluster = false;
+
+    // Blank out extra ops, in case we're in append mode and dropped ops.
+    if (cluster_size_) {
+        auto unused_cluster_space = cluster_size_ - current_cluster_size_;
+        std::string clr;
+        clr.resize(unused_cluster_space, '\0');
+        if (lseek(fd_.get(), next_op_pos_, SEEK_SET) < 0) {
+            PLOG(ERROR) << "Failed to seek to footer position.";
+            return false;
+        }
+        if (!android::base::WriteFully(fd_, clr.data(), clr.size())) {
+            PLOG(ERROR) << "clearing unused cluster area failed";
+            return false;
+        }
+    }
+
+    // Footer should be at the end of a file, so if there is data after the current block, end it
+    // and start a new cluster.
+    if (cluster_size_ && current_data_size_ > 0) {
+        EmitCluster();
+        extra_cluster = true;
+    }
+
+    footer_.op.ops_size = footer_.op.num_ops * sizeof(CowOperation);
+    if (lseek(fd_.get(), next_op_pos_, SEEK_SET) < 0) {
+        PLOG(ERROR) << "Failed to seek to footer position.";
+        return false;
+    }
+    memset(&footer_.data.ops_checksum, 0, sizeof(uint8_t) * 32);
+    memset(&footer_.data.footer_checksum, 0, sizeof(uint8_t) * 32);
+
+    SHA256(&footer_.op, sizeof(footer_.op), footer_.data.footer_checksum);
+    // Write out footer at end of file
+    if (!android::base::WriteFully(fd_, reinterpret_cast<const uint8_t*>(&footer_),
+                                   sizeof(footer_))) {
+        PLOG(ERROR) << "write footer failed";
+        return false;
+    }
+
+    // Remove excess data, if we're in append mode and threw away more data
+    // than we wrote before.
+    off_t offs = lseek(fd_.get(), 0, SEEK_CUR);
+    if (offs < 0) {
+        PLOG(ERROR) << "Failed to lseek to find current position";
+        return false;
+    }
+    if (!Truncate(offs)) {
+        return false;
+    }
+
+    // Reposition for additional Writing
+    if (extra_cluster) {
+        current_cluster_size_ = continue_cluster_size;
+        current_data_size_ = continue_data_size;
+        next_data_pos_ = continue_data_pos;
+        next_op_pos_ = continue_op_pos;
+        footer_.op.num_ops = continue_num_ops;
+    }
+
+    FlushCluster();
+
+    return Sync();
+}
+
+uint64_t CowWriter::GetCowSize() {
+    if (current_data_size_ > 0) {
+        return next_data_pos_ + sizeof(footer_);
+    } else {
+        return next_op_pos_ + sizeof(footer_);
+    }
+}
+
+bool CowWriter::GetDataPos(uint64_t* pos) {
+    off_t offs = lseek(fd_.get(), 0, SEEK_CUR);
+    if (offs < 0) {
+        PLOG(ERROR) << "lseek failed";
+        return false;
+    }
+    *pos = offs;
+    return true;
+}
+
+bool CowWriter::EnsureSpaceAvailable(const uint64_t bytes_needed) const {
+    if (bytes_needed > cow_image_size_) {
+        LOG(ERROR) << "No space left on COW device. Required: " << bytes_needed
+                   << ", available: " << cow_image_size_;
+        errno = ENOSPC;
+        return false;
+    }
+    return true;
+}
+
+bool CowWriter::FlushCluster() {
+    ssize_t ret;
+
+    if (op_vec_index_) {
+        ret = pwritev(fd_.get(), cowop_vec_.get(), op_vec_index_, current_op_pos_);
+        if (ret != (op_vec_index_ * sizeof(CowOperation))) {
+            PLOG(ERROR) << "pwritev failed for CowOperation. Expected: "
+                        << (op_vec_index_ * sizeof(CowOperation));
+            return false;
+        }
+    }
+
+    if (data_vec_index_) {
+        ret = pwritev(fd_.get(), data_vec_.get(), data_vec_index_, current_data_pos_);
+        if (ret != total_data_written_) {
+            PLOG(ERROR) << "pwritev failed for data. Expected: " << total_data_written_;
+            return false;
+        }
+    }
+
+    total_data_written_ = 0;
+    op_vec_index_ = 0;
+    data_vec_index_ = 0;
+    current_op_pos_ = next_op_pos_;
+    current_data_pos_ = next_data_pos_;
+
+    return true;
+}
+
+bool CowWriter::WriteOperation(const CowOperation& op, const void* data, size_t size) {
+    if (!EnsureSpaceAvailable(next_op_pos_ + sizeof(op))) {
+        return false;
+    }
+    if (!EnsureSpaceAvailable(next_data_pos_ + size)) {
+        return false;
+    }
+
+    if (batch_write_) {
+        CowOperation* cow_op = reinterpret_cast<CowOperation*>(cowop_vec_[op_vec_index_].iov_base);
+        std::memcpy(cow_op, &op, sizeof(CowOperation));
+        op_vec_index_ += 1;
+
+        if (data != nullptr && size > 0) {
+            struct iovec* data_ptr = data_vec_.get();
+            std::memcpy(data_ptr[data_vec_index_].iov_base, data, size);
+            data_ptr[data_vec_index_].iov_len = size;
+            data_vec_index_ += 1;
+            total_data_written_ += size;
+        }
+    } else {
+        if (lseek(fd_.get(), next_op_pos_, SEEK_SET) < 0) {
+            PLOG(ERROR) << "lseek failed for writing operation.";
+            return false;
+        }
+        if (!android::base::WriteFully(fd_, reinterpret_cast<const uint8_t*>(&op), sizeof(op))) {
+            return false;
+        }
+        if (data != nullptr && size > 0) {
+            if (!WriteRawData(data, size)) return false;
+        }
+    }
+
+    AddOperation(op);
+
+    if (batch_write_) {
+        if (op_vec_index_ == header_.cluster_ops || data_vec_index_ == header_.cluster_ops ||
+            op.type == kCowLabelOp || op.type == kCowClusterOp) {
+            if (!FlushCluster()) {
+                LOG(ERROR) << "Failed to flush cluster data";
+                return false;
+            }
+        }
+    }
+
+    return EmitClusterIfNeeded();
+}
+
+void CowWriter::AddOperation(const CowOperation& op) {
+    footer_.op.num_ops++;
+
+    if (op.type == kCowClusterOp) {
+        current_cluster_size_ = 0;
+        current_data_size_ = 0;
+    } else if (header_.cluster_ops) {
+        current_cluster_size_ += sizeof(op);
+        current_data_size_ += op.data_length;
+    }
+
+    next_data_pos_ += op.data_length + GetNextDataOffset(op, header_.cluster_ops);
+    next_op_pos_ += sizeof(CowOperation) + GetNextOpOffset(op, header_.cluster_ops);
+}
+
+bool CowWriter::WriteRawData(const void* data, const size_t size) {
+    if (!android::base::WriteFullyAtOffset(fd_, data, size, next_data_pos_)) {
+        return false;
+    }
+    return true;
+}
+
+bool CowWriter::Sync() {
+    if (is_dev_null_) {
+        return true;
+    }
+    if (fsync(fd_.get()) < 0) {
+        PLOG(ERROR) << "fsync failed";
+        return false;
+    }
+    return true;
+}
+
+bool CowWriter::Truncate(off_t length) {
+    if (is_dev_null_ || is_block_device_) {
+        return true;
+    }
+    if (ftruncate(fd_.get(), length) < 0) {
+        PLOG(ERROR) << "Failed to truncate.";
+        return false;
+    }
+    return true;
+}
+
+}  // namespace snapshot
+}  // namespace android
diff --git a/fs_mgr/libsnapshot/inspect_cow.cpp b/fs_mgr/libsnapshot/libsnapshot_cow/inspect_cow.cpp
similarity index 100%
rename from fs_mgr/libsnapshot/inspect_cow.cpp
rename to fs_mgr/libsnapshot/libsnapshot_cow/inspect_cow.cpp
diff --git a/fs_mgr/libsnapshot/partition_cow_creator.cpp b/fs_mgr/libsnapshot/partition_cow_creator.cpp
index 5569da0..7057223 100644
--- a/fs_mgr/libsnapshot/partition_cow_creator.cpp
+++ b/fs_mgr/libsnapshot/partition_cow_creator.cpp
@@ -143,7 +143,7 @@
 }
 
 std::optional<uint64_t> PartitionCowCreator::GetCowSize() {
-    if (compression_enabled) {
+    if (using_snapuserd) {
         if (update == nullptr || !update->has_estimate_cow_size()) {
             LOG(ERROR) << "Update manifest does not include a COW size";
             return std::nullopt;
diff --git a/fs_mgr/libsnapshot/partition_cow_creator.h b/fs_mgr/libsnapshot/partition_cow_creator.h
index 34b39ca..949e6c5 100644
--- a/fs_mgr/libsnapshot/partition_cow_creator.h
+++ b/fs_mgr/libsnapshot/partition_cow_creator.h
@@ -56,8 +56,8 @@
     // Extra extents that are going to be invalidated during the update
     // process.
     std::vector<ChromeOSExtent> extra_extents = {};
-    // True if compression is enabled.
-    bool compression_enabled = false;
+    // True if snapuserd COWs are enabled.
+    bool using_snapuserd = false;
     std::string compression_algorithm;
 
     struct Return {
diff --git a/fs_mgr/libsnapshot/partition_cow_creator_test.cpp b/fs_mgr/libsnapshot/partition_cow_creator_test.cpp
index de35c13..cf26a16 100644
--- a/fs_mgr/libsnapshot/partition_cow_creator_test.cpp
+++ b/fs_mgr/libsnapshot/partition_cow_creator_test.cpp
@@ -249,7 +249,7 @@
                                 .target_partition = system_b,
                                 .current_metadata = builder_a.get(),
                                 .current_suffix = "_a",
-                                .compression_enabled = true,
+                                .using_snapuserd = true,
                                 .update = &update};
 
     auto ret = creator.Run();
@@ -275,7 +275,7 @@
                                 .target_partition = system_b,
                                 .current_metadata = builder_a.get(),
                                 .current_suffix = "_a",
-                                .compression_enabled = true,
+                                .using_snapuserd = true,
                                 .update = nullptr};
 
     auto ret = creator.Run();
diff --git a/fs_mgr/libsnapshot/snapshot.cpp b/fs_mgr/libsnapshot/snapshot.cpp
index 870801e..6fed09c 100644
--- a/fs_mgr/libsnapshot/snapshot.cpp
+++ b/fs_mgr/libsnapshot/snapshot.cpp
@@ -53,6 +53,7 @@
 namespace android {
 namespace snapshot {
 
+using aidl::android::hardware::boot::MergeStatus;
 using android::base::unique_fd;
 using android::dm::DeviceMapper;
 using android::dm::DmDeviceState;
@@ -72,7 +73,6 @@
 using android::fs_mgr::LpMetadata;
 using android::fs_mgr::MetadataBuilder;
 using android::fs_mgr::SlotNumberForSlotSuffix;
-using android::hardware::boot::V1_1::MergeStatus;
 using chromeos_update_engine::DeltaArchiveManifest;
 using chromeos_update_engine::Extent;
 using chromeos_update_engine::FileDescriptor;
@@ -398,7 +398,7 @@
     status->set_state(SnapshotState::CREATED);
     status->set_sectors_allocated(0);
     status->set_metadata_sectors(0);
-    status->set_compression_enabled(cow_creator->compression_enabled);
+    status->set_using_snapuserd(cow_creator->using_snapuserd);
     status->set_compression_algorithm(cow_creator->compression_algorithm);
 
     if (!WriteSnapshotStatus(lock, *status)) {
@@ -788,7 +788,7 @@
         }
     }
 
-    bool compression_enabled = false;
+    bool using_snapuserd = false;
 
     std::vector<std::string> first_merge_group;
 
@@ -809,7 +809,7 @@
             return false;
         }
 
-        compression_enabled |= snapshot_status.compression_enabled();
+        using_snapuserd |= snapshot_status.using_snapuserd();
         if (DecideMergePhase(snapshot_status) == MergePhase::FIRST_PHASE) {
             first_merge_group.emplace_back(snapshot);
         }
@@ -817,7 +817,7 @@
 
     SnapshotUpdateStatus initial_status = ReadSnapshotUpdateStatus(lock.get());
     initial_status.set_state(UpdateState::Merging);
-    initial_status.set_compression_enabled(compression_enabled);
+    initial_status.set_using_snapuserd(using_snapuserd);
 
     if (!UpdateUsesUserSnapshots(lock.get())) {
         initial_status.set_sectors_allocated(initial_target_values.sectors_allocated);
@@ -988,6 +988,29 @@
     return true;
 }
 
+auto SnapshotManager::UpdateStateToStr(const enum UpdateState state) {
+    switch (state) {
+        case None:
+            return "None";
+        case Initiated:
+            return "Initiated";
+        case Unverified:
+            return "Unverified";
+        case Merging:
+            return "Merging";
+        case MergeNeedsReboot:
+            return "MergeNeedsReboot";
+        case MergeCompleted:
+            return "MergeCompleted";
+        case MergeFailed:
+            return "MergeFailed";
+        case Cancelled:
+            return "Cancelled";
+        default:
+            return "Unknown";
+    }
+}
+
 bool SnapshotManager::QuerySnapshotStatus(const std::string& dm_name, std::string* target_type,
                                           DmTargetSnapshot::Status* status) {
     DeviceMapper::TargetInfo target;
@@ -1016,7 +1039,7 @@
                                                 const std::function<bool()>& before_cancel) {
     while (true) {
         auto result = CheckMergeState(before_cancel);
-        LOG(INFO) << "ProcessUpdateState handling state: " << result.state;
+        LOG(INFO) << "ProcessUpdateState handling state: " << UpdateStateToStr(result.state);
 
         if (result.state == UpdateState::MergeFailed) {
             AcknowledgeMergeFailure(result.failure_code);
@@ -1044,7 +1067,7 @@
     }
 
     auto result = CheckMergeState(lock.get(), before_cancel);
-    LOG(INFO) << "CheckMergeState for snapshots returned: " << result.state;
+    LOG(INFO) << "CheckMergeState for snapshots returned: " << UpdateStateToStr(result.state);
 
     if (result.state == UpdateState::MergeCompleted) {
         // Do this inside the same lock. Failures get acknowledged without the
@@ -1109,7 +1132,8 @@
         }
 
         auto result = CheckTargetMergeState(lock, snapshot, update_status);
-        LOG(INFO) << "CheckTargetMergeState for " << snapshot << " returned: " << result.state;
+        LOG(INFO) << "CheckTargetMergeState for " << snapshot
+                  << " returned: " << UpdateStateToStr(result.state);
 
         switch (result.state) {
             case UpdateState::MergeFailed:
@@ -1340,7 +1364,7 @@
 }
 
 MergeFailureCode CheckMergeConsistency(const std::string& name, const SnapshotStatus& status) {
-    if (!status.compression_enabled()) {
+    if (!status.using_snapuserd()) {
         // Do not try to verify old-style COWs yet.
         return MergeFailureCode::Ok;
     }
@@ -1474,7 +1498,6 @@
     if (UpdateUsesUserSnapshots(lock) && !device()->IsTestDevice()) {
         if (snapuserd_client_) {
             snapuserd_client_->DetachSnapuserd();
-            snapuserd_client_->CloseConnection();
             snapuserd_client_ = nullptr;
         }
     }
@@ -1601,7 +1624,7 @@
         // as unmap will fail since dm-user itself was a snapshot device prior
         // to switching of tables. Unmap will fail as the device will be mounted
         // by system partitions
-        if (status.compression_enabled()) {
+        if (status.using_snapuserd()) {
             auto dm_user_name = GetDmUserCowName(name, GetSnapshotDriver(lock));
             UnmapDmUserDevice(dm_user_name);
         }
@@ -1723,13 +1746,6 @@
 
         auto misc_name = user_cow_name;
 
-        DmTable table;
-        table.Emplace<DmTargetUser>(0, target.spec.length, misc_name);
-        if (!dm_.LoadTableAndActivate(user_cow_name, table)) {
-            LOG(ERROR) << "Unable to swap tables for " << misc_name;
-            continue;
-        }
-
         std::string source_device_name;
         if (snapshot_status.old_partition_size() > 0) {
             source_device_name = GetSourceDeviceName(snapshot);
@@ -1757,13 +1773,6 @@
             continue;
         }
 
-        // Wait for ueventd to acknowledge and create the control device node.
-        std::string control_device = "/dev/dm-user/" + misc_name;
-        if (!WaitForDevice(control_device, 10s)) {
-            LOG(ERROR) << "dm-user control device no found:  " << misc_name;
-            continue;
-        }
-
         if (transition == InitTransition::SELINUX_DETACH) {
             if (!UpdateUsesUserSnapshots(lock.get())) {
                 auto message = misc_name + "," + cow_image_device + "," + source_device;
@@ -1781,6 +1790,20 @@
             continue;
         }
 
+        DmTable table;
+        table.Emplace<DmTargetUser>(0, target.spec.length, misc_name);
+        if (!dm_.LoadTableAndActivate(user_cow_name, table)) {
+            LOG(ERROR) << "Unable to swap tables for " << misc_name;
+            continue;
+        }
+
+        // Wait for ueventd to acknowledge and create the control device node.
+        std::string control_device = "/dev/dm-user/" + misc_name;
+        if (!WaitForDevice(control_device, 10s)) {
+            LOG(ERROR) << "dm-user control device no found:  " << misc_name;
+            continue;
+        }
+
         uint64_t base_sectors;
         if (!UpdateUsesUserSnapshots(lock.get())) {
             base_sectors =
@@ -2091,8 +2114,10 @@
 }
 
 bool SnapshotManager::UpdateUsesCompression(LockedFile* lock) {
+    // This returns true even if compression is "none", since update_engine is
+    // really just trying to see if snapuserd is in use.
     SnapshotUpdateStatus update_status = ReadSnapshotUpdateStatus(lock);
-    return update_status.compression_enabled();
+    return update_status.using_snapuserd();
 }
 
 bool SnapshotManager::UpdateUsesIouring(LockedFile* lock) {
@@ -2250,8 +2275,8 @@
                 .block_device = super_device,
                 .metadata = metadata.get(),
                 .partition = &partition,
-                .partition_opener = &opener,
                 .timeout_ms = timeout_ms,
+                .partition_opener = &opener,
         };
         if (!MapPartitionWithSnapshot(lock, std::move(params), SnapshotContext::Mount, nullptr)) {
             return false;
@@ -2412,13 +2437,13 @@
     remaining_time = GetRemainingTime(params.timeout_ms, begin);
     if (remaining_time.count() < 0) return false;
 
-    if (context == SnapshotContext::Update && live_snapshot_status->compression_enabled()) {
+    if (context == SnapshotContext::Update && live_snapshot_status->using_snapuserd()) {
         // Stop here, we can't run dm-user yet, the COW isn't built.
         created_devices.Release();
         return true;
     }
 
-    if (live_snapshot_status->compression_enabled()) {
+    if (live_snapshot_status->using_snapuserd()) {
         // Get the source device (eg the view of the partition from before it was resized).
         std::string source_device_path;
         if (live_snapshot_status->old_partition_size() > 0) {
@@ -2728,8 +2753,8 @@
                 .block_device = super_device,
                 .metadata = metadata.get(),
                 .partition_name = snapshot,
-                .partition_opener = &opener,
                 .timeout_ms = timeout_ms,
+                .partition_opener = &opener,
         };
         if (!MapPartitionWithSnapshot(lock.get(), std::move(params), SnapshotContext::Mount,
                                       nullptr)) {
@@ -2768,7 +2793,6 @@
     if (snapuserd_client_) {
         LOG(INFO) << "Shutdown snapuserd daemon";
         snapuserd_client_->DetachSnapuserd();
-        snapuserd_client_->CloseConnection();
         snapuserd_client_ = nullptr;
     }
 
@@ -2920,7 +2944,7 @@
     // build fingerprint.
     if (!(state == UpdateState::Initiated || state == UpdateState::None)) {
         SnapshotUpdateStatus old_status = ReadSnapshotUpdateStatus(lock);
-        status.set_compression_enabled(old_status.compression_enabled());
+        status.set_using_snapuserd(old_status.using_snapuserd());
         status.set_source_build_fingerprint(old_status.source_build_fingerprint());
         status.set_merge_phase(old_status.merge_phase());
         status.set_userspace_snapshots(old_status.userspace_snapshots());
@@ -3174,18 +3198,42 @@
     LOG(INFO) << " dap_metadata.cow_version(): " << dap_metadata.cow_version()
               << " writer.GetCowVersion(): " << writer.GetCowVersion();
 
-    bool use_compression = IsCompressionEnabled() && dap_metadata.vabc_enabled() &&
-                           !device_->IsRecovery() && cow_format_support;
+    // Deduce supported features.
+    bool userspace_snapshots = CanUseUserspaceSnapshots();
+    bool legacy_compression = GetLegacyCompressionEnabledProperty();
+
+    std::string vabc_disable_reason;
+    if (!dap_metadata.vabc_enabled()) {
+        vabc_disable_reason = "not enabled metadata";
+    } else if (device_->IsRecovery()) {
+        vabc_disable_reason = "recovery";
+    } else if (!cow_format_support) {
+        vabc_disable_reason = "cow format not supported";
+    }
+
+    if (!vabc_disable_reason.empty()) {
+        if (userspace_snapshots) {
+            LOG(INFO) << "Userspace snapshots disabled: " << vabc_disable_reason;
+        }
+        if (legacy_compression) {
+            LOG(INFO) << "Compression disabled: " << vabc_disable_reason;
+        }
+        userspace_snapshots = false;
+        legacy_compression = false;
+    }
+
+    const bool using_snapuserd = userspace_snapshots || legacy_compression;
+    if (!using_snapuserd) {
+        LOG(INFO) << "Using legacy Virtual A/B (dm-snapshot)";
+    }
 
     std::string compression_algorithm;
-    if (use_compression) {
+    if (using_snapuserd) {
         compression_algorithm = dap_metadata.vabc_compression_param();
         if (compression_algorithm.empty()) {
             // Older OTAs don't set an explicit compression type, so default to gz.
             compression_algorithm = "gz";
         }
-    } else {
-        compression_algorithm = "none";
     }
 
     PartitionCowCreator cow_creator{
@@ -3196,7 +3244,7 @@
             .current_suffix = current_suffix,
             .update = nullptr,
             .extra_extents = {},
-            .compression_enabled = use_compression,
+            .using_snapuserd = using_snapuserd,
             .compression_algorithm = compression_algorithm,
     };
 
@@ -3221,11 +3269,11 @@
         return Return::Error();
     }
 
-    // If compression is enabled, we need to retain a copy of the old metadata
+    // If snapuserd is enabled, we need to retain a copy of the old metadata
     // so we can access original blocks in case they are moved around. We do
     // not want to rely on the old super metadata slot because we don't
     // guarantee its validity after the slot switch is successful.
-    if (cow_creator.compression_enabled) {
+    if (using_snapuserd) {
         auto metadata = current_metadata->Export();
         if (!metadata) {
             LOG(ERROR) << "Could not export current metadata";
@@ -3241,70 +3289,36 @@
 
     SnapshotUpdateStatus status = ReadSnapshotUpdateStatus(lock.get());
     status.set_state(update_state);
-    status.set_compression_enabled(cow_creator.compression_enabled);
-    if (cow_creator.compression_enabled) {
-        if (!device()->IsTestDevice()) {
-            bool userSnapshotsEnabled = IsUserspaceSnapshotsEnabled();
-            const std::string UNKNOWN = "unknown";
-            const std::string vendor_release = android::base::GetProperty(
-                    "ro.vendor.build.version.release_or_codename", UNKNOWN);
+    status.set_using_snapuserd(using_snapuserd);
 
-            // No user-space snapshots if vendor partition is on Android 12
-            if (vendor_release.find("12") != std::string::npos) {
-                LOG(INFO) << "Userspace snapshots disabled as vendor partition is on Android: "
-                          << vendor_release;
-                userSnapshotsEnabled = false;
-            }
+    if (userspace_snapshots) {
+        status.set_userspace_snapshots(true);
+        LOG(INFO) << "Virtual A/B using userspace snapshots";
 
-            // Userspace snapshots is enabled only if compression is enabled
-            status.set_userspace_snapshots(userSnapshotsEnabled);
-            if (userSnapshotsEnabled) {
-                is_snapshot_userspace_ = true;
-                status.set_io_uring_enabled(IsIouringEnabled());
-                LOG(INFO) << "Userspace snapshots enabled";
-            } else {
-                is_snapshot_userspace_ = false;
-                LOG(INFO) << "Userspace snapshots disabled";
-            }
+        if (GetIouringEnabledProperty()) {
+            status.set_io_uring_enabled(true);
+            LOG(INFO) << "io_uring for snapshots enabled";
+        }
+    } else if (legacy_compression) {
+        LOG(INFO) << "Virtual A/B using legacy snapuserd";
+    } else {
+        LOG(INFO) << "Virtual A/B using dm-snapshot";
+    }
 
-            // Terminate stale daemon if any
-            std::unique_ptr<SnapuserdClient> snapuserd_client =
-                    SnapuserdClient::Connect(kSnapuserdSocket, 5s);
-            if (snapuserd_client) {
-                snapuserd_client->DetachSnapuserd();
-                snapuserd_client->CloseConnection();
-                snapuserd_client = nullptr;
-            }
+    is_snapshot_userspace_.emplace(userspace_snapshots);
 
-            // Clear the cached client if any
-            if (snapuserd_client_) {
-                snapuserd_client_->CloseConnection();
-                snapuserd_client_ = nullptr;
-            }
-        } else {
-            bool userSnapshotsEnabled = true;
-            const std::string UNKNOWN = "unknown";
-            const std::string vendor_release = android::base::GetProperty(
-                    "ro.vendor.build.version.release_or_codename", UNKNOWN);
-
-            // No user-space snapshots if vendor partition is on Android 12
-            if (vendor_release.find("12") != std::string::npos) {
-                LOG(INFO) << "Userspace snapshots disabled as vendor partition is on Android: "
-                          << vendor_release;
-                userSnapshotsEnabled = false;
-            }
-
-            userSnapshotsEnabled = (userSnapshotsEnabled && !IsDmSnapshotTestingEnabled());
-            status.set_userspace_snapshots(userSnapshotsEnabled);
-            if (!userSnapshotsEnabled) {
-                is_snapshot_userspace_ = false;
-                LOG(INFO) << "User-space snapshots disabled for testing";
-            } else {
-                is_snapshot_userspace_ = true;
-                LOG(INFO) << "User-space snapshots enabled for testing";
-            }
+    if (!device()->IsTestDevice() && using_snapuserd) {
+        // Terminate stale daemon if any
+        std::unique_ptr<SnapuserdClient> snapuserd_client = std::move(snapuserd_client_);
+        if (!snapuserd_client) {
+            snapuserd_client = SnapuserdClient::Connect(kSnapuserdSocket, 5s);
+        }
+        if (snapuserd_client) {
+            snapuserd_client->DetachSnapuserd();
+            snapuserd_client = nullptr;
         }
     }
+
     if (!WriteSnapshotUpdateStatus(lock.get(), status)) {
         LOG(ERROR) << "Unable to write new update state";
         return Return::Error();
@@ -3497,7 +3511,7 @@
             return Return::Error();
         }
 
-        if (it->second.compression_enabled()) {
+        if (it->second.using_snapuserd()) {
             unique_fd fd(open(cow_path.c_str(), O_RDWR | O_CLOEXEC));
             if (fd < 0) {
                 PLOG(ERROR) << "open " << cow_path << " failed for snapshot "
@@ -3543,8 +3557,8 @@
     if (!ReadSnapshotStatus(lock.get(), params.GetPartitionName(), &status)) {
         return false;
     }
-    if (status.compression_enabled()) {
-        LOG(ERROR) << "Cannot use MapUpdateSnapshot with compressed snapshots";
+    if (status.using_snapuserd()) {
+        LOG(ERROR) << "Cannot use MapUpdateSnapshot with snapuserd";
         return false;
     }
 
@@ -3601,7 +3615,7 @@
         return nullptr;
     }
 
-    if (status.compression_enabled()) {
+    if (status.using_snapuserd()) {
         return OpenCompressedSnapshotWriter(lock.get(), source_device, params.GetPartitionName(),
                                             status, paths);
     }
@@ -3731,7 +3745,10 @@
     auto update_status = ReadSnapshotUpdateStatus(file.get());
 
     ss << "Update state: " << ReadUpdateState(file.get()) << std::endl;
-    ss << "Compression: " << update_status.compression_enabled() << std::endl;
+    ss << "Using snapuserd: " << update_status.using_snapuserd() << std::endl;
+    ss << "Using userspace snapshots: " << update_status.userspace_snapshots() << std::endl;
+    ss << "Using io_uring: " << update_status.io_uring_enabled() << std::endl;
+    ss << "Using XOR compression: " << GetXorCompressionEnabledProperty() << std::endl;
     ss << "Current slot: " << device_->GetSlotSuffix() << std::endl;
     ss << "Boot indicator: booting from " << GetCurrentSlot() << " slot" << std::endl;
     ss << "Rollback indicator: "
@@ -3952,7 +3969,7 @@
         if (!ReadSnapshotStatus(lock, snapshot, &status)) {
             return false;
         }
-        if (status.compression_enabled()) {
+        if (status.using_snapuserd()) {
             continue;
         }
 
@@ -4116,13 +4133,74 @@
     if (!lock) return false;
 
     auto status = ReadSnapshotUpdateStatus(lock.get());
-    return status.state() != UpdateState::None && status.compression_enabled();
+    return status.state() != UpdateState::None && status.using_snapuserd();
 }
 
-bool SnapshotManager::DetachSnapuserdForSelinux(std::vector<std::string>* snapuserd_argv) {
+bool SnapshotManager::PrepareSnapuserdArgsForSelinux(std::vector<std::string>* snapuserd_argv) {
     return PerformInitTransition(InitTransition::SELINUX_DETACH, snapuserd_argv);
 }
 
+bool SnapshotManager::DetachFirstStageSnapuserdForSelinux() {
+    LOG(INFO) << "Detaching first stage snapuserd";
+
+    auto lock = LockExclusive();
+    if (!lock) return false;
+
+    std::vector<std::string> snapshots;
+    if (!ListSnapshots(lock.get(), &snapshots)) {
+        LOG(ERROR) << "Failed to list snapshots.";
+        return false;
+    }
+
+    size_t num_cows = 0;
+    size_t ok_cows = 0;
+    for (const auto& snapshot : snapshots) {
+        std::string user_cow_name = GetDmUserCowName(snapshot, GetSnapshotDriver(lock.get()));
+
+        if (dm_.GetState(user_cow_name) == DmDeviceState::INVALID) {
+            continue;
+        }
+
+        DeviceMapper::TargetInfo target;
+        if (!GetSingleTarget(user_cow_name, TableQuery::Table, &target)) {
+            continue;
+        }
+
+        auto target_type = DeviceMapper::GetTargetType(target.spec);
+        if (target_type != "user") {
+            LOG(ERROR) << "Unexpected target type for " << user_cow_name << ": " << target_type;
+            continue;
+        }
+
+        num_cows++;
+        auto misc_name = user_cow_name;
+
+        DmTable table;
+        table.Emplace<DmTargetUser>(0, target.spec.length, misc_name);
+        if (!dm_.LoadTableAndActivate(user_cow_name, table)) {
+            LOG(ERROR) << "Unable to swap tables for " << misc_name;
+            continue;
+        }
+
+        // Wait for ueventd to acknowledge and create the control device node.
+        std::string control_device = "/dev/dm-user/" + misc_name;
+        if (!WaitForDevice(control_device, 10s)) {
+            LOG(ERROR) << "dm-user control device no found:  " << misc_name;
+            continue;
+        }
+
+        ok_cows++;
+        LOG(INFO) << "control device is ready: " << control_device;
+    }
+
+    if (ok_cows != num_cows) {
+        LOG(ERROR) << "Could not transition all snapuserd consumers.";
+        return false;
+    }
+
+    return true;
+}
+
 bool SnapshotManager::PerformSecondStageInitTransition() {
     return PerformInitTransition(InitTransition::SECOND_STAGE);
 }
@@ -4142,7 +4220,7 @@
 }
 
 MergePhase SnapshotManager::DecideMergePhase(const SnapshotStatus& status) {
-    if (status.compression_enabled() && status.device_size() < status.old_partition_size()) {
+    if (status.using_snapuserd() && status.device_size() < status.old_partition_size()) {
         return MergePhase::FIRST_PHASE;
     }
     return MergePhase::SECOND_PHASE;
@@ -4172,9 +4250,19 @@
         estimated_cow_size += status.estimated_cow_size();
     }
 
-    stats->set_cow_file_size(cow_file_size);
-    stats->set_total_cow_size_bytes(total_cow_size);
-    stats->set_estimated_cow_size_bytes(estimated_cow_size);
+    stats->report()->set_cow_file_size(cow_file_size);
+    stats->report()->set_total_cow_size_bytes(total_cow_size);
+    stats->report()->set_estimated_cow_size_bytes(estimated_cow_size);
+}
+
+void SnapshotManager::SetMergeStatsFeatures(ISnapshotMergeStats* stats) {
+    auto lock = LockExclusive();
+    if (!lock) return;
+
+    SnapshotUpdateStatus update_status = ReadSnapshotUpdateStatus(lock.get());
+    stats->report()->set_iouring_used(update_status.io_uring_enabled());
+    stats->report()->set_userspace_snapshots_used(update_status.userspace_snapshots());
+    stats->report()->set_xor_compression_used(GetXorCompressionEnabledProperty());
 }
 
 bool SnapshotManager::DeleteDeviceIfExists(const std::string& name,
diff --git a/fs_mgr/libsnapshot/snapshot_fuzz_utils.h b/fs_mgr/libsnapshot/snapshot_fuzz_utils.h
index a648384..eb8246a 100644
--- a/fs_mgr/libsnapshot/snapshot_fuzz_utils.h
+++ b/fs_mgr/libsnapshot/snapshot_fuzz_utils.h
@@ -29,6 +29,7 @@
 // by SnapshotManager.
 
 #include "android/snapshot/snapshot_fuzz.pb.h"
+#include "libsnapshot/snapshot.h"
 
 namespace android::snapshot {
 
@@ -94,6 +95,7 @@
 
 class SnapshotFuzzDeviceInfo : public ISnapshotManager::IDeviceInfo {
   public:
+    using MergeStatus = ISnapshotManager::IDeviceInfo::MergeStatus;
     // Client is responsible for maintaining the lifetime of |data|.
     SnapshotFuzzDeviceInfo(SnapshotFuzzEnv* env, const FuzzDeviceInfoData& data,
                            std::unique_ptr<TestPartitionOpener>&& partition_opener,
@@ -118,7 +120,7 @@
     std::string GetSlotSuffix() const override { return CurrentSlotIsA() ? "_a" : "_b"; }
     std::string GetOtherSlotSuffix() const override { return CurrentSlotIsA() ? "_b" : "_a"; }
     bool IsOverlayfsSetup() const override { return data_->is_overlayfs_setup(); }
-    bool SetBootControlMergeStatus(android::hardware::boot::V1_1::MergeStatus) override {
+    bool SetBootControlMergeStatus(MergeStatus) override {
         return data_->allow_set_boot_control_merge_status();
     }
     bool SetSlotAsUnbootable(unsigned int) override {
diff --git a/fs_mgr/libsnapshot/snapshot_stats.cpp b/fs_mgr/libsnapshot/snapshot_stats.cpp
index 712eafb..9b6eb2c 100644
--- a/fs_mgr/libsnapshot/snapshot_stats.cpp
+++ b/fs_mgr/libsnapshot/snapshot_stats.cpp
@@ -84,27 +84,14 @@
     return WriteState();
 }
 
-void SnapshotMergeStats::set_state(android::snapshot::UpdateState state, bool using_compression) {
+void SnapshotMergeStats::set_state(android::snapshot::UpdateState state) {
     report_.set_state(state);
-    report_.set_compression_enabled(using_compression);
-}
-
-void SnapshotMergeStats::set_cow_file_size(uint64_t cow_file_size) {
-    report_.set_cow_file_size(cow_file_size);
 }
 
 uint64_t SnapshotMergeStats::cow_file_size() {
     return report_.cow_file_size();
 }
 
-void SnapshotMergeStats::set_total_cow_size_bytes(uint64_t bytes) {
-    report_.set_total_cow_size_bytes(bytes);
-}
-
-void SnapshotMergeStats::set_estimated_cow_size_bytes(uint64_t bytes) {
-    report_.set_estimated_cow_size_bytes(bytes);
-}
-
 uint64_t SnapshotMergeStats::total_cow_size_bytes() {
     return report_.total_cow_size_bytes();
 }
diff --git a/fs_mgr/libsnapshot/snapshot_stub.cpp b/fs_mgr/libsnapshot/snapshot_stub.cpp
index 4af5367..84e2226 100644
--- a/fs_mgr/libsnapshot/snapshot_stub.cpp
+++ b/fs_mgr/libsnapshot/snapshot_stub.cpp
@@ -128,12 +128,9 @@
 
 class SnapshotMergeStatsStub : public ISnapshotMergeStats {
     bool Start() override { return false; }
-    void set_state(android::snapshot::UpdateState, bool) override {}
-    void set_cow_file_size(uint64_t) override {}
+    void set_state(android::snapshot::UpdateState) override {}
     uint64_t cow_file_size() override { return 0; }
     std::unique_ptr<Result> Finish() override { return nullptr; }
-    void set_total_cow_size_bytes(uint64_t) override {}
-    void set_estimated_cow_size_bytes(uint64_t) override {}
     uint64_t total_cow_size_bytes() override { return 0; }
     uint64_t estimated_cow_size_bytes() override { return 0; }
     void set_boot_complete_time_ms(uint32_t) override {}
@@ -145,6 +142,10 @@
     void set_source_build_fingerprint(const std::string&) override {}
     std::string source_build_fingerprint() override { return {}; }
     bool WriteState() override { return false; }
+    SnapshotMergeReport* report() override { return &report_; }
+
+  private:
+    SnapshotMergeReport report_;
 };
 
 ISnapshotMergeStats* SnapshotManagerStub::GetSnapshotMergeStatsInstance() {
@@ -183,4 +184,8 @@
     return {};
 }
 
+void SnapshotManagerStub::SetMergeStatsFeatures(ISnapshotMergeStats*) {
+    LOG(ERROR) << __FUNCTION__ << " should never be called.";
+}
+
 }  // namespace android::snapshot
diff --git a/fs_mgr/libsnapshot/snapshot_test.cpp b/fs_mgr/libsnapshot/snapshot_test.cpp
index c145da7..2c01cf6 100644
--- a/fs_mgr/libsnapshot/snapshot_test.cpp
+++ b/fs_mgr/libsnapshot/snapshot_test.cpp
@@ -26,6 +26,7 @@
 #include <future>
 #include <iostream>
 
+#include <aidl/android/hardware/boot/MergeStatus.h>
 #include <android-base/file.h>
 #include <android-base/logging.h>
 #include <android-base/properties.h>
@@ -39,6 +40,7 @@
 #include <libdm/dm.h>
 #include <libfiemap/image_manager.h>
 #include <liblp/builder.h>
+#include <openssl/sha.h>
 #include <storage_literals/storage_literals.h>
 
 #include <android/snapshot/snapshot.pb.h>
@@ -51,9 +53,11 @@
 #include <libsnapshot/mock_device_info.h>
 #include <libsnapshot/mock_snapshot.h>
 
-DEFINE_string(force_config, "", "Force testing mode (dmsnap, vab, vabc) ignoring device config.");
+DEFINE_string(force_mode, "",
+              "Force testing older modes (vab-legacy, vabc-legacy) ignoring device config.");
 DEFINE_string(force_iouring_disable, "",
               "Force testing mode (iouring_disabled) - disable io_uring");
+DEFINE_string(compression_method, "gz", "Default compression algorithm.");
 
 namespace android {
 namespace snapshot {
@@ -90,8 +94,6 @@
 std::string fake_super;
 
 void MountMetadata();
-bool ShouldUseCompression();
-bool IsDaemonRequired();
 
 class SnapshotTest : public ::testing::Test {
   public:
@@ -105,9 +107,15 @@
 
   protected:
     void SetUp() override {
+        const testing::TestInfo* const test_info =
+                testing::UnitTest::GetInstance()->current_test_info();
+        test_name_ = test_info->test_suite_name() + "/"s + test_info->name();
+
+        LOG(INFO) << "Starting test: " << test_name_;
+
         SKIP_IF_NON_VIRTUAL_AB();
 
-        SnapshotTestPropertyFetcher::SetUp();
+        SetupProperties();
         InitializeState();
         CleanupTestArtifacts();
         FormatFakeSuper();
@@ -115,13 +123,49 @@
         ASSERT_TRUE(sm->BeginUpdate());
     }
 
+    void SetupProperties() {
+        std::unordered_map<std::string, std::string> properties;
+
+        ASSERT_TRUE(android::base::SetProperty("snapuserd.test.dm.snapshots", "0"))
+                << "Failed to disable property: virtual_ab.userspace.snapshots.enabled";
+        ASSERT_TRUE(android::base::SetProperty("snapuserd.test.io_uring.force_disable", "0"))
+                << "Failed to set property: snapuserd.test.io_uring.disabled";
+
+        if (FLAGS_force_mode == "vabc-legacy") {
+            ASSERT_TRUE(android::base::SetProperty("snapuserd.test.dm.snapshots", "1"))
+                    << "Failed to disable property: virtual_ab.userspace.snapshots.enabled";
+            properties["ro.virtual_ab.compression.enabled"] = "true";
+            properties["ro.virtual_ab.userspace.snapshots.enabled"] = "false";
+        } else if (FLAGS_force_mode == "vab-legacy") {
+            properties["ro.virtual_ab.compression.enabled"] = "false";
+            properties["ro.virtual_ab.userspace.snapshots.enabled"] = "false";
+        }
+
+        if (FLAGS_force_iouring_disable == "iouring_disabled") {
+            ASSERT_TRUE(android::base::SetProperty("snapuserd.test.io_uring.force_disable", "1"))
+                    << "Failed to set property: snapuserd.test.io_uring.disabled";
+            properties["ro.virtual_ab.io_uring.enabled"] = "false";
+        }
+
+        auto fetcher = std::make_unique<SnapshotTestPropertyFetcher>("_a", std::move(properties));
+        IPropertyFetcher::OverrideForTesting(std::move(fetcher));
+
+        if (GetLegacyCompressionEnabledProperty() || CanUseUserspaceSnapshots()) {
+            snapuserd_required_ = true;
+        }
+    }
+
     void TearDown() override {
         RETURN_IF_NON_VIRTUAL_AB();
 
+        LOG(INFO) << "Tearing down SnapshotTest test: " << test_name_;
+
         lock_ = nullptr;
 
         CleanupTestArtifacts();
         SnapshotTestPropertyFetcher::TearDown();
+
+        LOG(INFO) << "Teardown complete for test: " << test_name_;
     }
 
     void InitializeState() {
@@ -315,7 +359,7 @@
     }
 
     AssertionResult DeleteDevice(const std::string& device) {
-        if (!dm_.DeleteDeviceIfExists(device)) {
+        if (!sm->DeleteDeviceIfExists(device, 1s)) {
             return AssertionFailure() << "Can't delete " << device;
         }
         return AssertionSuccess();
@@ -357,8 +401,11 @@
         DeltaArchiveManifest manifest;
 
         auto dynamic_partition_metadata = manifest.mutable_dynamic_partition_metadata();
-        dynamic_partition_metadata->set_vabc_enabled(IsCompressionEnabled());
+        dynamic_partition_metadata->set_vabc_enabled(snapuserd_required_);
         dynamic_partition_metadata->set_cow_version(android::snapshot::kCowVersionMajor);
+        if (snapuserd_required_) {
+            dynamic_partition_metadata->set_vabc_compression_param(FLAGS_compression_method);
+        }
 
         auto group = dynamic_partition_metadata->add_groups();
         group->set_name("group");
@@ -396,7 +443,7 @@
             if (!res) {
                 return res;
             }
-        } else if (!IsCompressionEnabled()) {
+        } else if (!snapuserd_required_) {
             std::string ignore;
             if (!MapUpdateSnapshot("test_partition_b", &ignore)) {
                 return AssertionFailure() << "Failed to map test_partition_b";
@@ -449,15 +496,17 @@
     std::unique_ptr<SnapshotManager::LockedFile> lock_;
     android::fiemap::IImageManager* image_manager_ = nullptr;
     std::string fake_super_;
+    bool snapuserd_required_ = false;
+    std::string test_name_;
 };
 
 TEST_F(SnapshotTest, CreateSnapshot) {
     ASSERT_TRUE(AcquireLock());
 
     PartitionCowCreator cow_creator;
-    cow_creator.compression_enabled = ShouldUseCompression();
-    if (cow_creator.compression_enabled) {
-        cow_creator.compression_algorithm = "gz";
+    cow_creator.using_snapuserd = snapuserd_required_;
+    if (cow_creator.using_snapuserd) {
+        cow_creator.compression_algorithm = FLAGS_compression_method;
     } else {
         cow_creator.compression_algorithm = "none";
     }
@@ -483,7 +532,7 @@
         ASSERT_EQ(status.state(), SnapshotState::CREATED);
         ASSERT_EQ(status.device_size(), kDeviceSize);
         ASSERT_EQ(status.snapshot_size(), kDeviceSize);
-        ASSERT_EQ(status.compression_enabled(), cow_creator.compression_enabled);
+        ASSERT_EQ(status.using_snapuserd(), cow_creator.using_snapuserd);
         ASSERT_EQ(status.compression_algorithm(), cow_creator.compression_algorithm);
     }
 
@@ -496,7 +545,7 @@
     ASSERT_TRUE(AcquireLock());
 
     PartitionCowCreator cow_creator;
-    cow_creator.compression_enabled = ShouldUseCompression();
+    cow_creator.using_snapuserd = snapuserd_required_;
 
     static const uint64_t kDeviceSize = 1024 * 1024;
     SnapshotStatus status;
@@ -623,10 +672,10 @@
     SnapshotStatus status;
     ASSERT_TRUE(init->ReadSnapshotStatus(lock_.get(), "test_partition_b", &status));
     ASSERT_EQ(status.state(), SnapshotState::CREATED);
-    if (ShouldUseCompression()) {
-        ASSERT_EQ(status.compression_algorithm(), "gz");
+    if (snapuserd_required_) {
+        ASSERT_EQ(status.compression_algorithm(), FLAGS_compression_method);
     } else {
-        ASSERT_EQ(status.compression_algorithm(), "none");
+        ASSERT_EQ(status.compression_algorithm(), "");
     }
 
     DeviceMapper::TargetInfo target;
@@ -897,8 +946,11 @@
         opener_ = std::make_unique<TestPartitionOpener>(fake_super);
 
         auto dynamic_partition_metadata = manifest_.mutable_dynamic_partition_metadata();
-        dynamic_partition_metadata->set_vabc_enabled(ShouldUseCompression());
+        dynamic_partition_metadata->set_vabc_enabled(snapuserd_required_);
         dynamic_partition_metadata->set_cow_version(android::snapshot::kCowVersionMajor);
+        if (snapuserd_required_) {
+            dynamic_partition_metadata->set_vabc_compression_param(FLAGS_compression_method);
+        }
 
         // Create a fake update package metadata.
         // Not using full name "system", "vendor", "product" because these names collide with the
@@ -962,6 +1014,8 @@
     void TearDown() override {
         RETURN_IF_NON_VIRTUAL_AB();
 
+        LOG(INFO) << "Tearing down SnapshotUpdateTest test: " << test_name_;
+
         Cleanup();
         SnapshotTest::TearDown();
     }
@@ -1030,7 +1084,7 @@
     }
 
     AssertionResult MapOneUpdateSnapshot(const std::string& name) {
-        if (ShouldUseCompression()) {
+        if (snapuserd_required_) {
             std::unique_ptr<ISnapshotWriter> writer;
             return MapUpdateSnapshot(name, &writer);
         } else {
@@ -1039,14 +1093,25 @@
         }
     }
 
-    AssertionResult WriteSnapshotAndHash(const std::string& name) {
-        if (ShouldUseCompression()) {
+    AssertionResult WriteSnapshots() {
+        for (const auto& partition : {sys_, vnd_, prd_}) {
+            auto res = WriteSnapshotAndHash(partition);
+            if (!res) {
+                return res;
+            }
+        }
+        return AssertionSuccess();
+    }
+
+    AssertionResult WriteSnapshotAndHash(PartitionUpdate* partition) {
+        std::string name = partition->partition_name() + "_b";
+        if (snapuserd_required_) {
             std::unique_ptr<ISnapshotWriter> writer;
             auto res = MapUpdateSnapshot(name, &writer);
             if (!res) {
                 return res;
             }
-            if (!WriteRandomData(writer.get(), &hashes_[name])) {
+            if (!WriteRandomSnapshotData(writer.get(), &hashes_[name])) {
                 return AssertionFailure() << "Unable to write random data to snapshot " << name;
             }
             if (!writer->Finalize()) {
@@ -1070,6 +1135,42 @@
                                   << ", hash: " << hashes_[name];
     }
 
+    bool WriteRandomSnapshotData(ICowWriter* writer, std::string* hash) {
+        unique_fd rand(open("/dev/urandom", O_RDONLY));
+        if (rand < 0) {
+            PLOG(ERROR) << "open /dev/urandom";
+            return false;
+        }
+
+        SHA256_CTX ctx;
+        SHA256_Init(&ctx);
+
+        if (!writer->options().max_blocks) {
+            LOG(ERROR) << "CowWriter must specify maximum number of blocks";
+            return false;
+        }
+        const auto num_blocks = writer->options().max_blocks.value();
+
+        const auto block_size = writer->options().block_size;
+        std::string block(block_size, '\0');
+        for (uint64_t i = 0; i < num_blocks; i++) {
+            if (!ReadFully(rand, block.data(), block.size())) {
+                PLOG(ERROR) << "read /dev/urandom";
+                return false;
+            }
+            if (!writer->AddRawBlocks(i, block.data(), block.size())) {
+                LOG(ERROR) << "Failed to add raw block " << i;
+                return false;
+            }
+            SHA256_Update(&ctx, block.data(), block.size());
+        }
+
+        uint8_t out[32];
+        SHA256_Final(out, &ctx);
+        *hash = ToHexString(out, sizeof(out));
+        return true;
+    }
+
     // Generate a snapshot that moves all the upper blocks down to the start.
     // It doesn't really matter the order, we just want copies that reference
     // blocks that won't exist if the partition shrinks.
@@ -1178,9 +1279,7 @@
     ASSERT_EQ(nullptr, tgt->FindPartition("prd_b-cow"));
 
     // Write some data to target partitions.
-    for (const auto& name : {"sys_b", "vnd_b", "prd_b"}) {
-        ASSERT_TRUE(WriteSnapshotAndHash(name));
-    }
+    ASSERT_TRUE(WriteSnapshots());
 
     // Assert that source partitions aren't affected.
     for (const auto& name : {"sys_a", "vnd_a", "prd_a"}) {
@@ -1208,7 +1307,7 @@
 
     // Initiate the merge and wait for it to be completed.
     ASSERT_TRUE(init->InitiateMerge());
-    ASSERT_EQ(init->IsSnapuserdRequired(), IsDaemonRequired());
+    ASSERT_EQ(init->IsSnapuserdRequired(), snapuserd_required_);
     {
         // We should have started in SECOND_PHASE since nothing shrinks.
         ASSERT_TRUE(AcquireLock());
@@ -1235,8 +1334,8 @@
 }
 
 TEST_F(SnapshotUpdateTest, DuplicateOps) {
-    if (!ShouldUseCompression()) {
-        GTEST_SKIP() << "Compression-only test";
+    if (!snapuserd_required_) {
+        GTEST_SKIP() << "snapuserd-only test";
     }
 
     // Execute the update.
@@ -1244,9 +1343,7 @@
     ASSERT_TRUE(sm->CreateUpdateSnapshots(manifest_));
 
     // Write some data to target partitions.
-    for (const auto& name : {"sys_b", "vnd_b", "prd_b"}) {
-        ASSERT_TRUE(WriteSnapshotAndHash(name));
-    }
+    ASSERT_TRUE(WriteSnapshots());
 
     std::vector<PartitionUpdate*> partitions = {sys_, vnd_, prd_};
     for (auto* partition : partitions) {
@@ -1279,9 +1376,9 @@
 // Test that shrinking and growing partitions at the same time is handled
 // correctly in VABC.
 TEST_F(SnapshotUpdateTest, SpaceSwapUpdate) {
-    if (!ShouldUseCompression()) {
+    if (!snapuserd_required_) {
         // b/179111359
-        GTEST_SKIP() << "Skipping Virtual A/B Compression test";
+        GTEST_SKIP() << "Skipping snapuserd test";
     }
 
     auto old_sys_size = GetSize(sys_);
@@ -1310,8 +1407,8 @@
         ASSERT_EQ(status.old_partition_size(), 3145728);
     }
 
-    ASSERT_TRUE(WriteSnapshotAndHash("sys_b"));
-    ASSERT_TRUE(WriteSnapshotAndHash("vnd_b"));
+    ASSERT_TRUE(WriteSnapshotAndHash(sys_));
+    ASSERT_TRUE(WriteSnapshotAndHash(vnd_));
     ASSERT_TRUE(ShiftAllSnapshotBlocks("prd_b", old_prd_size));
 
     sync();
@@ -1342,7 +1439,7 @@
 
     // Initiate the merge and wait for it to be completed.
     ASSERT_TRUE(init->InitiateMerge());
-    ASSERT_EQ(init->IsSnapuserdRequired(), IsDaemonRequired());
+    ASSERT_EQ(init->IsSnapuserdRequired(), snapuserd_required_);
     {
         // Check that the merge phase is FIRST_PHASE until at least one call
         // to ProcessUpdateState() occurs.
@@ -1396,9 +1493,9 @@
 
 // Test that a transient merge consistency check failure can resume properly.
 TEST_F(SnapshotUpdateTest, ConsistencyCheckResume) {
-    if (!ShouldUseCompression()) {
+    if (!snapuserd_required_) {
         // b/179111359
-        GTEST_SKIP() << "Skipping Virtual A/B Compression test";
+        GTEST_SKIP() << "Skipping snapuserd test";
     }
 
     auto old_sys_size = GetSize(sys_);
@@ -1414,8 +1511,8 @@
 
     ASSERT_TRUE(sm->BeginUpdate());
     ASSERT_TRUE(sm->CreateUpdateSnapshots(manifest_));
-    ASSERT_TRUE(WriteSnapshotAndHash("sys_b"));
-    ASSERT_TRUE(WriteSnapshotAndHash("vnd_b"));
+    ASSERT_TRUE(WriteSnapshotAndHash(sys_));
+    ASSERT_TRUE(WriteSnapshotAndHash(vnd_));
     ASSERT_TRUE(ShiftAllSnapshotBlocks("prd_b", old_prd_size));
 
     sync();
@@ -1450,7 +1547,7 @@
 
     // Initiate the merge and wait for it to be completed.
     ASSERT_TRUE(init->InitiateMerge());
-    ASSERT_EQ(init->IsSnapuserdRequired(), IsDaemonRequired());
+    ASSERT_EQ(init->IsSnapuserdRequired(), snapuserd_required_);
     {
         // Check that the merge phase is FIRST_PHASE until at least one call
         // to ProcessUpdateState() occurs.
@@ -1576,9 +1673,7 @@
     ASSERT_TRUE(sm->CreateUpdateSnapshots(manifest_));
 
     // Write some data to target partitions.
-    for (const auto& name : {"sys_b", "vnd_b", "prd_b"}) {
-        ASSERT_TRUE(WriteSnapshotAndHash(name));
-    }
+    ASSERT_TRUE(WriteSnapshots());
 
     // Assert that source partitions aren't affected.
     for (const auto& name : {"sys_a", "vnd_a", "prd_a"}) {
@@ -1737,9 +1832,7 @@
     ASSERT_FALSE(image_manager_->BackingImageExists("prd_b-cow-img"));
 
     // Write some data to target partitions.
-    for (const auto& name : {"sys_b", "vnd_b", "prd_b"}) {
-        ASSERT_TRUE(WriteSnapshotAndHash(name));
-    }
+    ASSERT_TRUE(WriteSnapshots());
 
     // Assert that source partitions aren't affected.
     for (const auto& name : {"sys_a", "vnd_a", "prd_a"}) {
@@ -2011,9 +2104,7 @@
     ASSERT_TRUE(sm->CreateUpdateSnapshots(manifest_));
 
     // Write some data to target partitions.
-    for (const auto& name : {"sys_b", "vnd_b", "prd_b"}) {
-        ASSERT_TRUE(WriteSnapshotAndHash(name)) << name;
-    }
+    ASSERT_TRUE(WriteSnapshots());
 
     ASSERT_TRUE(sm->FinishedSnapshotWrites(true /* wipe */));
 
@@ -2053,17 +2144,15 @@
     ASSERT_TRUE(sm->CreateUpdateSnapshots(manifest_));
 
     // Write some data to target partitions.
-    for (const auto& name : {"sys_b", "vnd_b", "prd_b"}) {
-        ASSERT_TRUE(WriteSnapshotAndHash(name)) << name;
-    }
+    ASSERT_TRUE(WriteSnapshots());
 
     // Create a stale snapshot that should not exist.
     {
         ASSERT_TRUE(AcquireLock());
 
         PartitionCowCreator cow_creator = {
-                .compression_enabled = ShouldUseCompression(),
-                .compression_algorithm = ShouldUseCompression() ? "gz" : "none",
+                .using_snapuserd = snapuserd_required_,
+                .compression_algorithm = snapuserd_required_ ? FLAGS_compression_method : "",
         };
         SnapshotStatus status;
         status.set_name("sys_a");
@@ -2138,7 +2227,7 @@
 
     // Map and write some data to target partition.
     ASSERT_TRUE(MapUpdateSnapshots({"vnd_b", "prd_b"}));
-    ASSERT_TRUE(WriteSnapshotAndHash("sys_b"));
+    ASSERT_TRUE(WriteSnapshotAndHash(sys_));
 
     // Finish update.
     ASSERT_TRUE(sm->FinishedSnapshotWrites(false));
@@ -2159,8 +2248,8 @@
 
 // Test for overflow bit after update
 TEST_F(SnapshotUpdateTest, Overflow) {
-    if (ShouldUseCompression()) {
-        GTEST_SKIP() << "No overflow bit set for userspace COWs";
+    if (snapuserd_required_) {
+        GTEST_SKIP() << "No overflow bit set for snapuserd COWs";
     }
 
     const auto actual_write_size = GetSize(sys_);
@@ -2174,7 +2263,7 @@
 
     // Map and write some data to target partitions.
     ASSERT_TRUE(MapUpdateSnapshots({"vnd_b", "prd_b"}));
-    ASSERT_TRUE(WriteSnapshotAndHash("sys_b"));
+    ASSERT_TRUE(WriteSnapshotAndHash(sys_));
 
     std::vector<android::dm::DeviceMapper::TargetInfo> table;
     ASSERT_TRUE(DeviceMapper::Instance().GetTableStatus("sys_b", &table));
@@ -2234,8 +2323,8 @@
     ASSERT_TRUE(sm->CreateUpdateSnapshots(manifest_));
 
     // Write some data to target partitions.
-    for (const auto& name : {"sys_b", "vnd_b", "prd_b", "dlkm_b"}) {
-        ASSERT_TRUE(WriteSnapshotAndHash(name));
+    for (const auto& partition : {sys_, vnd_, prd_, dlkm}) {
+        ASSERT_TRUE(WriteSnapshotAndHash(partition));
     }
 
     // Assert that source partitions aren't affected.
@@ -2294,8 +2383,8 @@
 };
 
 TEST_F(SnapshotUpdateTest, DaemonTransition) {
-    if (!ShouldUseCompression()) {
-        GTEST_SKIP() << "Skipping Virtual A/B Compression test";
+    if (!snapuserd_required_) {
+        GTEST_SKIP() << "Skipping snapuserd test";
     }
 
     // Ensure a connection to the second-stage daemon, but use the first-stage
@@ -2359,9 +2448,7 @@
     // Execute the update.
     ASSERT_TRUE(sm->BeginUpdate());
     ASSERT_TRUE(sm->CreateUpdateSnapshots(manifest_));
-    for (const auto& name : {"sys_b", "vnd_b", "prd_b"}) {
-        ASSERT_TRUE(WriteSnapshotAndHash(name));
-    }
+    ASSERT_TRUE(WriteSnapshots());
     ASSERT_TRUE(sm->FinishedSnapshotWrites(false));
     ASSERT_TRUE(sm->MapAllSnapshots(10s));
 
@@ -2411,13 +2498,6 @@
     // fit in super, but not |prd|.
     constexpr uint64_t partition_size = 3788_KiB;
     SetSize(sys_, partition_size);
-    SetSize(vnd_, partition_size);
-    SetSize(prd_, 18_MiB);
-
-    // Make sure |prd| does not fit in super at all. On VABC, this means we
-    // fake an extra large COW for |vnd| to fill up super.
-    vnd_->set_estimate_cow_size(30_MiB);
-    prd_->set_estimate_cow_size(30_MiB);
 
     AddOperationForPartitions();
 
@@ -2429,23 +2509,7 @@
         GTEST_SKIP() << "Test does not apply to userspace snapshots";
     }
 
-    // Test that partitions prioritize using space in super.
-    auto tgt = MetadataBuilder::New(*opener_, "super", 1);
-    ASSERT_NE(tgt, nullptr);
-    ASSERT_NE(nullptr, tgt->FindPartition("sys_b-cow"));
-    ASSERT_NE(nullptr, tgt->FindPartition("vnd_b-cow"));
-    ASSERT_EQ(nullptr, tgt->FindPartition("prd_b-cow"));
-
-    // Write some data to target partitions.
-    for (const auto& name : {"sys_b", "vnd_b", "prd_b"}) {
-        ASSERT_TRUE(WriteSnapshotAndHash(name));
-    }
-
-    // Assert that source partitions aren't affected.
-    for (const auto& name : {"sys_a", "vnd_a", "prd_a"}) {
-        ASSERT_TRUE(IsPartitionUnchanged(name));
-    }
-
+    ASSERT_TRUE(WriteSnapshots());
     ASSERT_TRUE(sm->FinishedSnapshotWrites(false));
 
     ASSERT_TRUE(UnmapAll());
@@ -2609,7 +2673,6 @@
     }
     void TearDown() override {
         RETURN_IF_NON_VIRTUAL_AB();
-        return;  // BUG(149738928)
 
         EXPECT_TRUE(!image_manager_->BackingImageExists(kImageName) ||
                     image_manager_->DeleteBackingImage(kImageName));
@@ -2618,19 +2681,6 @@
     std::unique_ptr<LowSpaceUserdata> userdata_;
 };
 
-TEST_P(ImageManagerTest, CreateImageEnoughAvailSpace) {
-    if (userdata_->available_space() == 0) {
-        GTEST_SKIP() << "/data is full (" << userdata_->available_space()
-                     << " bytes available), skipping";
-    }
-    ASSERT_TRUE(image_manager_->CreateBackingImage(kImageName, userdata_->available_space(),
-                                                   IImageManager::CREATE_IMAGE_DEFAULT))
-            << "Should be able to create image with size = " << userdata_->available_space()
-            << " bytes";
-    ASSERT_TRUE(image_manager_->DeleteBackingImage(kImageName))
-            << "Should be able to delete created image";
-}
-
 TEST_P(ImageManagerTest, CreateImageNoSpace) {
     uint64_t to_allocate = userdata_->free_space() + userdata_->bsize();
     auto res = image_manager_->CreateBackingImage(kImageName, to_allocate,
@@ -2750,41 +2800,16 @@
     }
 }
 
-bool IsDaemonRequired() {
-    if (FLAGS_force_config == "dmsnap") {
-        return false;
+void KillSnapuserd() {
+    auto status = android::base::GetProperty("init.svc.snapuserd", "stopped");
+    if (status == "stopped") {
+        return;
     }
-
-    if (!IsCompressionEnabled()) {
-        return false;
+    auto snapuserd_client = SnapuserdClient::Connect(kSnapuserdSocket, 5s);
+    if (!snapuserd_client) {
+        return;
     }
-
-    const std::string UNKNOWN = "unknown";
-    const std::string vendor_release =
-            android::base::GetProperty("ro.vendor.build.version.release_or_codename", UNKNOWN);
-
-    // No userspace snapshots if vendor partition is on Android 12
-    // However, for GRF devices, snapuserd daemon will be on
-    // vendor ramdisk in Android 12.
-    if (vendor_release.find("12") != std::string::npos) {
-        return true;
-    }
-
-    if (!FLAGS_force_config.empty()) {
-        return true;
-    }
-
-    return IsUserspaceSnapshotsEnabled();
-}
-
-bool ShouldUseCompression() {
-    if (FLAGS_force_config == "vab" || FLAGS_force_config == "dmsnap") {
-        return false;
-    }
-    if (FLAGS_force_config == "vabc") {
-        return true;
-    }
-    return IsCompressionEnabled();
+    snapuserd_client->DetachSnapuserd();
 }
 
 }  // namespace snapshot
@@ -2797,35 +2822,20 @@
 
     android::base::SetProperty("ctl.stop", "snapuserd");
 
-    std::unordered_set<std::string> configs = {"", "dmsnap", "vab", "vabc"};
-    if (configs.count(FLAGS_force_config) == 0) {
+    std::unordered_set<std::string> modes = {"", "vab-legacy", "vabc-legacy"};
+    if (modes.count(FLAGS_force_mode) == 0) {
         std::cerr << "Unexpected force_config argument\n";
         return 1;
     }
 
-    if (FLAGS_force_config == "dmsnap") {
-        if (!android::base::SetProperty("snapuserd.test.dm.snapshots", "1")) {
-            return testing::AssertionFailure()
-                   << "Failed to disable property: virtual_ab.userspace.snapshots.enabled";
-        }
-    }
-
-    if (FLAGS_force_iouring_disable == "iouring_disabled") {
-        if (!android::base::SetProperty("snapuserd.test.io_uring.force_disable", "1")) {
-            return testing::AssertionFailure()
-                   << "Failed to disable property: snapuserd.test.io_uring.disabled";
-        }
-    }
+    // This is necessary if the configuration we're testing doesn't match the device.
+    android::snapshot::KillSnapuserd();
 
     int ret = RUN_ALL_TESTS();
 
-    if (FLAGS_force_config == "dmsnap") {
-        android::base::SetProperty("snapuserd.test.dm.snapshots", "0");
-    }
+    android::base::SetProperty("snapuserd.test.dm.snapshots", "0");
+    android::base::SetProperty("snapuserd.test.io_uring.force_disable", "0");
 
-    if (FLAGS_force_iouring_disable == "iouring_disabled") {
-        android::base::SetProperty("snapuserd.test.io_uring.force_disable", "0");
-    }
-
+    android::snapshot::KillSnapuserd();
     return ret;
 }
diff --git a/fs_mgr/libsnapshot/snapshot_writer.cpp b/fs_mgr/libsnapshot/snapshot_writer.cpp
index 48b7d80..82a7fd7 100644
--- a/fs_mgr/libsnapshot/snapshot_writer.cpp
+++ b/fs_mgr/libsnapshot/snapshot_writer.cpp
@@ -93,6 +93,9 @@
 
 std::unique_ptr<FileDescriptor> CompressedSnapshotWriter::OpenReader() {
     auto cow = OpenCowReader();
+    if (cow == nullptr) {
+        return nullptr;
+    }
 
     auto reader = std::make_unique<CompressedSnapshotReader>();
     if (!reader->SetCow(std::move(cow))) {
@@ -111,8 +114,9 @@
     return reader;
 }
 
-bool CompressedSnapshotWriter::EmitCopy(uint64_t new_block, uint64_t old_block) {
-    return cow_->AddCopy(new_block, old_block);
+bool CompressedSnapshotWriter::EmitCopy(uint64_t new_block, uint64_t old_block,
+                                        uint64_t num_blocks) {
+    return cow_->AddCopy(new_block, old_block, num_blocks);
 }
 
 bool CompressedSnapshotWriter::EmitRawBlocks(uint64_t new_block_start, const void* data,
@@ -191,19 +195,29 @@
     return true;
 }
 
-bool OnlineKernelSnapshotWriter::EmitCopy(uint64_t new_block, uint64_t old_block) {
+bool OnlineKernelSnapshotWriter::EmitCopy(uint64_t new_block, uint64_t old_block,
+                                          uint64_t num_blocks) {
     auto source_fd = GetSourceFd();
     if (source_fd < 0) {
         return false;
     }
 
-    std::string buffer(options_.block_size, 0);
-    uint64_t offset = old_block * options_.block_size;
-    if (!android::base::ReadFullyAtOffset(source_fd, buffer.data(), buffer.size(), offset)) {
-        PLOG(ERROR) << "EmitCopy read";
-        return false;
+    CHECK(num_blocks != 0);
+
+    for (size_t i = 0; i < num_blocks; i++) {
+        std::string buffer(options_.block_size, 0);
+        uint64_t offset = (old_block + i) * options_.block_size;
+        if (!android::base::ReadFullyAtOffset(source_fd, buffer.data(), buffer.size(), offset)) {
+            PLOG(ERROR) << "EmitCopy read";
+            return false;
+        }
+        if (!EmitRawBlocks(new_block + i, buffer.data(), buffer.size())) {
+            PLOG(ERROR) << "EmitRawBlocks failed";
+            return false;
+        }
     }
-    return EmitRawBlocks(new_block, buffer.data(), buffer.size());
+
+    return true;
 }
 
 bool OnlineKernelSnapshotWriter::EmitLabel(uint64_t) {
diff --git a/fs_mgr/libsnapshot/snapshotctl.cpp b/fs_mgr/libsnapshot/snapshotctl.cpp
index 67189d4..ad3f83c 100644
--- a/fs_mgr/libsnapshot/snapshotctl.cpp
+++ b/fs_mgr/libsnapshot/snapshotctl.cpp
@@ -25,9 +25,27 @@
 #include <android-base/logging.h>
 #include <android-base/unique_fd.h>
 
+#include <fs_mgr.h>
+#include <fs_mgr_dm_linear.h>
+#include <fstab/fstab.h>
+#include <liblp/builder.h>
+#include <libsnapshot/cow_format.h>
 #include <libsnapshot/snapshot.h>
+#include <storage_literals/storage_literals.h>
 
+#ifdef SNAPSHOTCTL_USERDEBUG_OR_ENG
+#include <BootControlClient.h>
+#endif
+
+using namespace std::chrono_literals;
 using namespace std::string_literals;
+using namespace android::storage_literals;
+using android::fs_mgr::CreateLogicalPartitionParams;
+using android::fs_mgr::FindPartition;
+using android::fs_mgr::GetPartitionSize;
+using android::fs_mgr::PartitionOpener;
+using android::fs_mgr::ReadMetadata;
+using android::fs_mgr::SlotNumberForSlotSuffix;
 
 int Usage() {
     std::cerr << "snapshotctl: Control snapshots.\n"
@@ -67,11 +85,136 @@
     return false;
 }
 
+#ifdef SNAPSHOTCTL_USERDEBUG_OR_ENG
+bool CreateTestUpdate(SnapshotManager* sm) {
+    chromeos_update_engine::DeltaArchiveManifest manifest;
+
+    // We only copy system, to simplify things.
+    manifest.set_partial_update(true);
+
+    auto dap = manifest.mutable_dynamic_partition_metadata();
+    dap->set_snapshot_enabled(true);
+    dap->set_vabc_enabled(true);
+    dap->set_vabc_compression_param("none");
+    dap->set_cow_version(kCowVersionMajor);
+
+    auto source_slot = fs_mgr_get_slot_suffix();
+    auto source_slot_number = SlotNumberForSlotSuffix(source_slot);
+    auto target_slot = fs_mgr_get_other_slot_suffix();
+    auto target_slot_number = SlotNumberForSlotSuffix(target_slot);
+    auto super_source = fs_mgr_get_super_partition_name(source_slot_number);
+
+    // Get current partition information.
+    PartitionOpener opener;
+    auto source_metadata = ReadMetadata(opener, super_source, source_slot_number);
+    if (!source_metadata) {
+        std::cerr << "Could not read source partition metadata.\n";
+        return false;
+    }
+
+    auto system_source_name = "system" + source_slot;
+    auto system_source = FindPartition(*source_metadata.get(), system_source_name);
+    if (!system_source) {
+        std::cerr << "Could not find system partition: " << system_source_name << ".\n";
+        return false;
+    }
+    auto system_source_size = GetPartitionSize(*source_metadata.get(), *system_source);
+
+    // Since we only add copy operations, 64MB should be enough.
+    auto system_update = manifest.mutable_partitions()->Add();
+    system_update->set_partition_name("system");
+    system_update->set_estimate_cow_size(64_MiB);
+    system_update->mutable_new_partition_info()->set_size(system_source_size);
+
+    if (!sm->CreateUpdateSnapshots(manifest)) {
+        std::cerr << "Could not create update snapshots.\n";
+        return false;
+    }
+
+    // Write the "new" system partition.
+    auto system_target_name = "system" + target_slot;
+    auto source_device = "/dev/block/mapper/" + system_source_name;
+    CreateLogicalPartitionParams clpp = {
+            .block_device = fs_mgr_get_super_partition_name(target_slot_number),
+            .metadata_slot = {target_slot_number},
+            .partition_name = system_target_name,
+            .partition_opener = &opener,
+            .timeout_ms = 10s,
+    };
+    auto writer = sm->OpenSnapshotWriter(clpp, {source_device});
+    if (!writer) {
+        std::cerr << "Could not open snapshot writer.\n";
+        return false;
+    }
+    if (!writer->Initialize()) {
+        std::cerr << "Could not initialize snapshot for writing.\n";
+        return false;
+    }
+
+    for (uint64_t block = 0; block < system_source_size / 4096; block++) {
+        if (!writer->AddCopy(block, block)) {
+            std::cerr << "Unable to add copy operation for block " << block << ".\n";
+            return false;
+        }
+    }
+    if (!writer->Finalize()) {
+        std::cerr << "Could not finalize COW for " << system_target_name << ".\n";
+        return false;
+    }
+    writer = nullptr;
+
+    // Finished writing this partition, unmap.
+    if (!sm->UnmapUpdateSnapshot(system_target_name)) {
+        std::cerr << "Could not unmap snapshot for " << system_target_name << ".\n";
+        return false;
+    }
+
+    // All snapshots have been written.
+    if (!sm->FinishedSnapshotWrites(false /* wipe */)) {
+        std::cerr << "Could not finalize snapshot writes.\n";
+        return false;
+    }
+
+    auto hal = hal::BootControlClient::WaitForService();
+    if (!hal) {
+        std::cerr << "Could not find IBootControl HAL.\n";
+        return false;
+    }
+    auto cr = hal->SetActiveBootSlot(target_slot_number);
+    if (!cr.IsOk()) {
+        std::cerr << "Could not set active boot slot: " << cr.errMsg;
+        return false;
+    }
+
+    std::cerr << "It is now safe to reboot your device. If using a physical device, make\n"
+              << "sure that all physical partitions are flashed to both A and B slots.\n";
+    return true;
+}
+
+bool TestOtaHandler(int /* argc */, char** /* argv */) {
+    auto sm = SnapshotManager::New();
+
+    if (!sm->BeginUpdate()) {
+        std::cerr << "Error starting update.\n";
+        return false;
+    }
+
+    if (!CreateTestUpdate(sm.get())) {
+        sm->CancelUpdate();
+        return false;
+    }
+    return true;
+}
+#endif
+
 static std::map<std::string, std::function<bool(int, char**)>> kCmdMap = {
         // clang-format off
         {"dump", DumpCmdHandler},
         {"merge", MergeCmdHandler},
         {"map", MapCmdHandler},
+#ifdef SNAPSHOTCTL_USERDEBUG_OR_ENG
+        {"test-blank-ota", TestOtaHandler},
+#endif
         {"unmap", UnmapCmdHandler},
         // clang-format on
 };
diff --git a/fs_mgr/libsnapshot/snapuserd/Android.bp b/fs_mgr/libsnapshot/snapuserd/Android.bp
index bc2bceb..64e0b8a 100644
--- a/fs_mgr/libsnapshot/snapuserd/Android.bp
+++ b/fs_mgr/libsnapshot/snapuserd/Android.bp
@@ -47,6 +47,7 @@
         "libbase",
         "liblog",
     ],
+    export_include_dirs: ["include"],
     ramdisk_available: true,
 }
 
@@ -68,11 +69,12 @@
         "user-space-merge/snapuserd_readahead.cpp",
         "user-space-merge/snapuserd_transitions.cpp",
         "user-space-merge/snapuserd_server.cpp",
+        "user-space-merge/snapuserd_verify.cpp",
     ],
 
     cflags: [
         "-Wall",
-        "-Werror"
+        "-Werror",
     ],
 
     static_libs: [
@@ -85,19 +87,18 @@
         "liblog",
         "libsnapshot_cow",
         "libz",
+        "liblz4",
         "libext4_utils",
         "liburing",
     ],
-    include_dirs: ["bionic/libc/kernel"],
-}
 
-cc_binary {
-    name: "snapuserd",
-    defaults: ["snapuserd_defaults"],
-    init_rc: [
-        "snapuserd.rc",
+    header_libs: [
+        "libstorage_literals_headers",
     ],
 
+    include_dirs: ["bionic/libc/kernel"],
+    system_shared_libs: [],
+
     // snapuserd is started during early boot by first-stage init. At that
     // point, /system is mounted using the "dm-user" device-mapper kernel
     // module. dm-user routes all I/O to userspace to be handled by
@@ -105,22 +106,47 @@
     // faults for its code pages.
     static_executable: true,
 
-    system_shared_libs: [],
-    ramdisk_available: true,
-    vendor_ramdisk_available: true,
-    recovery_available: true,
-
     // Snapuserd segfaults with ThinLTO
     // http://b/208565717
     lto: {
          never: true,
-    }
+    },
+}
+
+cc_binary {
+    name: "snapuserd",
+    defaults: ["snapuserd_defaults"],
+    init_rc: [
+        "snapuserd.rc",
+    ],
+    ramdisk_available: false,
+    vendor_ramdisk_available: true,
+    recovery_available: true,
+}
+
+// This target will install to /system/bin/snapuserd_ramdisk 
+// It will also create a symblink on /system/bin/snapuserd that point to
+// /system/bin/snapuserd_ramdisk .
+// This way, init can check if generic ramdisk copy exists.
+cc_binary {
+    name: "snapuserd_ramdisk",
+    defaults: ["snapuserd_defaults"],
+    init_rc: [
+        "snapuserd.rc",
+    ],
+    // This target is specifically for generic ramdisk, therefore we set
+    // vendor_ramdisk_available to false.
+    ramdisk_available: true,
+    vendor_ramdisk_available: false,
+    ramdisk: true,
+    symlinks: ["snapuserd"],
 }
 
 cc_test {
     name: "cow_snapuserd_test",
     defaults: [
         "fs_mgr_defaults",
+        "libsnapshot_cow_defaults",
     ],
     srcs: [
         "dm-snapshot-merge/cow_snapuserd_test.cpp",
@@ -162,6 +188,7 @@
     name: "snapuserd_test",
     defaults: [
         "fs_mgr_defaults",
+        "libsnapshot_cow_defaults",
     ],
     srcs: [
         "user-space-merge/snapuserd_test.cpp",
diff --git a/fs_mgr/libsnapshot/snapuserd/dm-snapshot-merge/snapuserd_server.cpp b/fs_mgr/libsnapshot/snapuserd/dm-snapshot-merge/snapuserd_server.cpp
index 9ddc963..577b09d 100644
--- a/fs_mgr/libsnapshot/snapuserd/dm-snapshot-merge/snapuserd_server.cpp
+++ b/fs_mgr/libsnapshot/snapuserd/dm-snapshot-merge/snapuserd_server.cpp
@@ -505,7 +505,7 @@
 
     // We don't care if the ACK is received.
     code[0] = 'a';
-    if (TEMP_FAILURE_RETRY(send(fd, code, sizeof(code), MSG_NOSIGNAL) < 0)) {
+    if (TEMP_FAILURE_RETRY(send(fd, code, sizeof(code), MSG_NOSIGNAL)) < 0) {
         PLOG(ERROR) << "Failed to send ACK to proxy";
         return false;
     }
diff --git a/fs_mgr/libsnapshot/snapuserd/include/snapuserd/snapuserd_client.h b/fs_mgr/libsnapshot/snapuserd/include/snapuserd/snapuserd_client.h
index cebda1c..4b62b20 100644
--- a/fs_mgr/libsnapshot/snapuserd/include/snapuserd/snapuserd_client.h
+++ b/fs_mgr/libsnapshot/snapuserd/include/snapuserd/snapuserd_client.h
@@ -71,8 +71,6 @@
     // must ONLY be called if the control device has already been deleted.
     bool WaitForDeviceDelete(const std::string& control_device);
 
-    void CloseConnection() { sockfd_ = {}; }
-
     // Detach snapuserd. This shuts down the listener socket, and will cause
     // snapuserd to gracefully exit once all handler threads have terminated.
     // This should only be used on first-stage instances of snapuserd.
@@ -89,6 +87,10 @@
 
     // Return the status of the snapshot
     std::string QuerySnapshotStatus(const std::string& misc_name);
+
+    // Check the update verification status - invoked by update_verifier during
+    // boot
+    bool QueryUpdateVerification();
 };
 
 }  // namespace snapshot
diff --git a/fs_mgr/libsnapshot/snapuserd/snapuserd.rc b/fs_mgr/libsnapshot/snapuserd/snapuserd.rc
index 2750096..522fe08 100644
--- a/fs_mgr/libsnapshot/snapuserd/snapuserd.rc
+++ b/fs_mgr/libsnapshot/snapuserd/snapuserd.rc
@@ -4,6 +4,7 @@
     disabled
     user root
     group root system
+    task_profiles OtaProfiles
     seclabel u:r:snapuserd:s0
 
 service snapuserd_proxy /system/bin/snapuserd -socket-handoff
diff --git a/fs_mgr/libsnapshot/snapuserd/snapuserd_client.cpp b/fs_mgr/libsnapshot/snapuserd/snapuserd_client.cpp
index 7b1c7a3..e08cf9b 100644
--- a/fs_mgr/libsnapshot/snapuserd/snapuserd_client.cpp
+++ b/fs_mgr/libsnapshot/snapuserd/snapuserd_client.cpp
@@ -269,5 +269,15 @@
     return Receivemsg();
 }
 
+bool SnapuserdClient::QueryUpdateVerification() {
+    std::string msg = "update-verify";
+    if (!Sendmsg(msg)) {
+        LOG(ERROR) << "Failed to send message " << msg << " to snapuserd";
+        return false;
+    }
+    std::string response = Receivemsg();
+    return response == "success";
+}
+
 }  // namespace snapshot
 }  // namespace android
diff --git a/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_core.cpp b/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_core.cpp
index 718c13c..492c43f 100644
--- a/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_core.cpp
+++ b/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_core.cpp
@@ -18,6 +18,7 @@
 
 #include <sys/utsname.h>
 
+#include <android-base/chrono_utils.h>
 #include <android-base/properties.h>
 #include <android-base/scopeguard.h>
 #include <android-base/strings.h>
@@ -70,6 +71,9 @@
 
     read_ahead_thread_ = std::make_unique<ReadAhead>(cow_device_, backing_store_device_, misc_name_,
                                                      GetSharedPtr());
+
+    update_verify_ = std::make_unique<UpdateVerify>(misc_name_);
+
     return true;
 }
 
@@ -158,7 +162,7 @@
 }
 
 bool SnapshotHandler::ReadMetadata() {
-    reader_ = std::make_unique<CowReader>(CowReader::ReaderFlags::USERSPACE_MERGE);
+    reader_ = std::make_unique<CowReader>(CowReader::ReaderFlags::USERSPACE_MERGE, true);
     CowHeader header;
     CowOptions options;
 
@@ -189,7 +193,7 @@
     UpdateMergeCompletionPercentage();
 
     // Initialize the iterator for reading metadata
-    std::unique_ptr<ICowOpIter> cowop_iter = reader_->GetMergeOpIter();
+    std::unique_ptr<ICowOpIter> cowop_iter = reader_->GetOpIter(true);
 
     int num_ra_ops_per_iter = ((GetBufferDataSize()) / BLOCK_SZ);
     int ra_index = 0;
@@ -307,206 +311,6 @@
     return ReadMetadata();
 }
 
-void SnapshotHandler::FinalizeIouring() {
-    io_uring_queue_exit(ring_.get());
-}
-
-bool SnapshotHandler::InitializeIouring(int io_depth) {
-    ring_ = std::make_unique<struct io_uring>();
-
-    int ret = io_uring_queue_init(io_depth, ring_.get(), 0);
-    if (ret) {
-        LOG(ERROR) << "io_uring_queue_init failed with ret: " << ret;
-        return false;
-    }
-
-    LOG(INFO) << "io_uring_queue_init success with io_depth: " << io_depth;
-    return true;
-}
-
-bool SnapshotHandler::ReadBlocksAsync(const std::string& dm_block_device,
-                                      const std::string& partition_name, size_t size) {
-    // 64k block size with io_depth of 64 is optimal
-    // for a single thread. We just need a single thread
-    // to read all the blocks from all dynamic partitions.
-    size_t io_depth = 64;
-    size_t bs = (64 * 1024);
-
-    if (!InitializeIouring(io_depth)) {
-        return false;
-    }
-
-    LOG(INFO) << "ReadBlockAsync start "
-              << " Block-device: " << dm_block_device << " Partition-name: " << partition_name
-              << " Size: " << size;
-
-    auto scope_guard = android::base::make_scope_guard([this]() -> void { FinalizeIouring(); });
-
-    std::vector<std::unique_ptr<struct iovec>> vecs;
-    using AlignedBuf = std::unique_ptr<void, decltype(free)*>;
-    std::vector<AlignedBuf> alignedBufVector;
-
-    /*
-     * TODO: We need aligned memory for DIRECT-IO. However, if we do
-     * a DIRECT-IO and verify the blocks then we need to inform
-     * update-verifier that block verification has been done and
-     * there is no need to repeat the same. We are not there yet
-     * as we need to see if there are any boot time improvements doing
-     * a DIRECT-IO.
-     *
-     * Also, we could you the same function post merge for block verification;
-     * again, we can do a DIRECT-IO instead of thrashing page-cache and
-     * hurting other applications.
-     *
-     * For now, we will just create aligned buffers but rely on buffered
-     * I/O until we have perf numbers to justify DIRECT-IO.
-     */
-    for (int i = 0; i < io_depth; i++) {
-        auto iovec = std::make_unique<struct iovec>();
-        vecs.push_back(std::move(iovec));
-
-        struct iovec* iovec_ptr = vecs[i].get();
-
-        if (posix_memalign(&iovec_ptr->iov_base, BLOCK_SZ, bs)) {
-            LOG(ERROR) << "posix_memalign failed";
-            return false;
-        }
-
-        iovec_ptr->iov_len = bs;
-        alignedBufVector.push_back(
-                std::unique_ptr<void, decltype(free)*>(iovec_ptr->iov_base, free));
-    }
-
-    android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(dm_block_device.c_str(), O_RDONLY)));
-    if (fd.get() == -1) {
-        SNAP_PLOG(ERROR) << "File open failed - block-device " << dm_block_device
-                         << " partition-name: " << partition_name;
-        return false;
-    }
-
-    loff_t offset = 0;
-    size_t remain = size;
-    size_t read_sz = io_depth * bs;
-
-    while (remain > 0) {
-        size_t to_read = std::min(remain, read_sz);
-        size_t queue_size = to_read / bs;
-
-        for (int i = 0; i < queue_size; i++) {
-            struct io_uring_sqe* sqe = io_uring_get_sqe(ring_.get());
-            if (!sqe) {
-                SNAP_LOG(ERROR) << "io_uring_get_sqe() failed";
-                return false;
-            }
-
-            struct iovec* iovec_ptr = vecs[i].get();
-
-            io_uring_prep_read(sqe, fd.get(), iovec_ptr->iov_base, iovec_ptr->iov_len, offset);
-            sqe->flags |= IOSQE_ASYNC;
-            offset += bs;
-        }
-
-        int ret = io_uring_submit(ring_.get());
-        if (ret != queue_size) {
-            SNAP_LOG(ERROR) << "submit got: " << ret << " wanted: " << queue_size;
-            return false;
-        }
-
-        for (int i = 0; i < queue_size; i++) {
-            struct io_uring_cqe* cqe;
-
-            int ret = io_uring_wait_cqe(ring_.get(), &cqe);
-            if (ret) {
-                SNAP_PLOG(ERROR) << "wait_cqe failed" << ret;
-                return false;
-            }
-
-            if (cqe->res < 0) {
-                SNAP_LOG(ERROR) << "io failed with res: " << cqe->res;
-                return false;
-            }
-            io_uring_cqe_seen(ring_.get(), cqe);
-        }
-
-        remain -= to_read;
-    }
-
-    LOG(INFO) << "ReadBlockAsync complete: "
-              << " Block-device: " << dm_block_device << " Partition-name: " << partition_name
-              << " Size: " << size;
-    return true;
-}
-
-void SnapshotHandler::ReadBlocksToCache(const std::string& dm_block_device,
-                                        const std::string& partition_name, off_t offset,
-                                        size_t size) {
-    android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(dm_block_device.c_str(), O_RDONLY)));
-    if (fd.get() == -1) {
-        SNAP_PLOG(ERROR) << "Error reading " << dm_block_device
-                         << " partition-name: " << partition_name;
-        return;
-    }
-
-    size_t remain = size;
-    off_t file_offset = offset;
-    // We pick 4M I/O size based on the fact that the current
-    // update_verifier has a similar I/O size.
-    size_t read_sz = 1024 * BLOCK_SZ;
-    std::vector<uint8_t> buf(read_sz);
-
-    while (remain > 0) {
-        size_t to_read = std::min(remain, read_sz);
-
-        if (!android::base::ReadFullyAtOffset(fd.get(), buf.data(), to_read, file_offset)) {
-            SNAP_PLOG(ERROR) << "Failed to read block from block device: " << dm_block_device
-                             << " at offset: " << file_offset
-                             << " partition-name: " << partition_name << " total-size: " << size
-                             << " remain_size: " << remain;
-            return;
-        }
-
-        file_offset += to_read;
-        remain -= to_read;
-    }
-
-    SNAP_LOG(INFO) << "Finished reading block-device: " << dm_block_device
-                   << " partition: " << partition_name << " size: " << size
-                   << " offset: " << offset;
-}
-
-void SnapshotHandler::ReadBlocks(const std::string partition_name,
-                                 const std::string& dm_block_device) {
-    SNAP_LOG(DEBUG) << "Reading partition: " << partition_name
-                    << " Block-Device: " << dm_block_device;
-
-    uint64_t dev_sz = 0;
-
-    unique_fd fd(TEMP_FAILURE_RETRY(open(dm_block_device.c_str(), O_RDONLY | O_CLOEXEC)));
-    if (fd < 0) {
-        SNAP_LOG(ERROR) << "Cannot open block device";
-        return;
-    }
-
-    dev_sz = get_block_device_size(fd.get());
-    if (!dev_sz) {
-        SNAP_PLOG(ERROR) << "Could not determine block device size: " << dm_block_device;
-        return;
-    }
-
-    int num_threads = 2;
-    size_t num_blocks = dev_sz >> BLOCK_SHIFT;
-    size_t num_blocks_per_thread = num_blocks / num_threads;
-    size_t read_sz_per_thread = num_blocks_per_thread << BLOCK_SHIFT;
-    off_t offset = 0;
-
-    for (int i = 0; i < num_threads; i++) {
-        std::async(std::launch::async, &SnapshotHandler::ReadBlocksToCache, this, dm_block_device,
-                   partition_name, offset, read_sz_per_thread);
-
-        offset += read_sz_per_thread;
-    }
-}
-
 /*
  * Entry point to launch threads
  */
@@ -527,42 +331,22 @@
                 std::async(std::launch::async, &Worker::RunThread, worker_threads_[i].get()));
     }
 
-    bool second_stage_init = true;
+    bool partition_verification = true;
 
-    // We don't want to read the blocks during first stage init.
+    // We don't want to read the blocks during first stage init or
+    // during post-install phase.
     if (android::base::EndsWith(misc_name_, "-init") || is_socket_present_) {
-        second_stage_init = false;
-    }
-
-    if (second_stage_init) {
-        SNAP_LOG(INFO) << "Reading blocks to cache....";
-        auto& dm = DeviceMapper::Instance();
-        auto dm_block_devices = dm.FindDmPartitions();
-        if (dm_block_devices.empty()) {
-            SNAP_LOG(ERROR) << "No dm-enabled block device is found.";
-        } else {
-            auto parts = android::base::Split(misc_name_, "-");
-            std::string partition_name = parts[0];
-
-            const char* suffix_b = "_b";
-            const char* suffix_a = "_a";
-
-            partition_name.erase(partition_name.find_last_not_of(suffix_b) + 1);
-            partition_name.erase(partition_name.find_last_not_of(suffix_a) + 1);
-
-            if (dm_block_devices.find(partition_name) == dm_block_devices.end()) {
-                SNAP_LOG(ERROR) << "Failed to find dm block device for " << partition_name;
-            } else {
-                ReadBlocks(partition_name, dm_block_devices.at(partition_name));
-            }
-        }
-    } else {
-        SNAP_LOG(INFO) << "Not reading block device into cache";
+        partition_verification = false;
     }
 
     std::future<bool> merge_thread =
             std::async(std::launch::async, &Worker::RunMergeThread, merge_thread_.get());
 
+    // Now that the worker threads are up, scan the partitions.
+    if (partition_verification) {
+        update_verify_->VerifyUpdatePartition();
+    }
+
     bool ret = true;
     for (auto& t : threads) {
         ret = t.get() && ret;
diff --git a/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_core.h b/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_core.h
index c6805e5..42237ef 100644
--- a/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_core.h
+++ b/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_core.h
@@ -45,12 +45,14 @@
 #include <liburing.h>
 #include <snapuserd/snapuserd_buffer.h>
 #include <snapuserd/snapuserd_kernel.h>
+#include <storage_literals/storage_literals.h>
 
 namespace android {
 namespace snapshot {
 
 using android::base::unique_fd;
 using namespace std::chrono_literals;
+using namespace android::storage_literals;
 
 static constexpr size_t PAYLOAD_BUFFER_SZ = (1UL << 20);
 static_assert(PAYLOAD_BUFFER_SZ >= BLOCK_SZ);
@@ -170,6 +172,36 @@
     std::unique_ptr<struct io_uring> ring_;
 };
 
+class UpdateVerify {
+  public:
+    UpdateVerify(const std::string& misc_name);
+    void VerifyUpdatePartition();
+    bool CheckPartitionVerification();
+
+  private:
+    enum class UpdateVerifyState {
+        VERIFY_UNKNOWN,
+        VERIFY_FAILED,
+        VERIFY_SUCCESS,
+    };
+
+    std::string misc_name_;
+    UpdateVerifyState state_;
+    std::mutex m_lock_;
+    std::condition_variable m_cv_;
+
+    int kMinThreadsToVerify = 1;
+    int kMaxThreadsToVerify = 4;
+    uint64_t kThresholdSize = 512_MiB;
+    uint64_t kBlockSizeVerify = 1_MiB;
+
+    bool IsBlockAligned(uint64_t read_size) { return ((read_size & (BLOCK_SZ - 1)) == 0); }
+    void UpdatePartitionVerificationState(UpdateVerifyState state);
+    bool VerifyPartition(const std::string& partition_name, const std::string& dm_block_device);
+    bool VerifyBlocks(const std::string& partition_name, const std::string& dm_block_device,
+                      off_t offset, int skip_blocks, uint64_t dev_sz);
+};
+
 class Worker {
   public:
     Worker(const std::string& cow_device, const std::string& backing_device,
@@ -352,24 +384,16 @@
     MERGE_GROUP_STATE ProcessMergingBlock(uint64_t new_block, void* buffer);
 
     bool IsIouringSupported();
+    bool CheckPartitionVerification() { return update_verify_->CheckPartitionVerification(); }
 
   private:
     bool ReadMetadata();
     sector_t ChunkToSector(chunk_t chunk) { return chunk << CHUNK_SHIFT; }
     chunk_t SectorToChunk(sector_t sector) { return sector >> CHUNK_SHIFT; }
-    bool IsBlockAligned(int read_size) { return ((read_size & (BLOCK_SZ - 1)) == 0); }
+    bool IsBlockAligned(uint64_t read_size) { return ((read_size & (BLOCK_SZ - 1)) == 0); }
     struct BufferState* GetBufferState();
     void UpdateMergeCompletionPercentage();
 
-    void ReadBlocks(const std::string partition_name, const std::string& dm_block_device);
-    void ReadBlocksToCache(const std::string& dm_block_device, const std::string& partition_name,
-                           off_t offset, size_t size);
-
-    bool InitializeIouring(int io_depth);
-    void FinalizeIouring();
-    bool ReadBlocksAsync(const std::string& dm_block_device, const std::string& partition_name,
-                         size_t size);
-
     // COW device
     std::string cow_device_;
     // Source device
@@ -422,6 +446,7 @@
     bool scratch_space_ = false;
 
     std::unique_ptr<struct io_uring> ring_;
+    std::unique_ptr<UpdateVerify> update_verify_;
 };
 
 }  // namespace snapshot
diff --git a/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_dm_user.cpp b/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_dm_user.cpp
index 1e300d2..0d0f711 100644
--- a/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_dm_user.cpp
+++ b/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_dm_user.cpp
@@ -253,6 +253,11 @@
 
 bool Worker::RunThread() {
     SNAP_LOG(INFO) << "Processing snapshot I/O requests....";
+
+    if (setpriority(PRIO_PROCESS, gettid(), kNiceValueForMergeThreads)) {
+        SNAP_PLOG(ERROR) << "Failed to set priority for TID: " << gettid();
+    }
+
     // Start serving IO
     while (true) {
         if (!ProcessIORequest()) {
diff --git a/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_merge.cpp b/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_merge.cpp
index 63f47d6..d57f434 100644
--- a/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_merge.cpp
+++ b/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_merge.cpp
@@ -466,7 +466,7 @@
 }
 
 bool Worker::Merge() {
-    cowop_iter_ = reader_->GetMergeOpIter();
+    cowop_iter_ = reader_->GetOpIter(true);
 
     bool retry = false;
     bool ordered_ops_merge_status;
diff --git a/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_readahead.cpp b/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_readahead.cpp
index b9e4255..fbe57d2 100644
--- a/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_readahead.cpp
+++ b/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_readahead.cpp
@@ -772,7 +772,7 @@
 }
 
 void ReadAhead::InitializeRAIter() {
-    cowop_iter_ = reader_->GetMergeOpIter();
+    cowop_iter_ = reader_->GetOpIter(true);
 }
 
 bool ReadAhead::RAIterDone() {
diff --git a/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_server.cpp b/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_server.cpp
index 5d93f01..d437d32 100644
--- a/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_server.cpp
+++ b/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_server.cpp
@@ -55,6 +55,7 @@
     if (input == "initiate_merge") return DaemonOps::INITIATE;
     if (input == "merge_percent") return DaemonOps::PERCENTAGE;
     if (input == "getstatus") return DaemonOps::GETSTATUS;
+    if (input == "update-verify") return DaemonOps::UPDATE_VERIFY;
 
     return DaemonOps::INVALID;
 }
@@ -290,6 +291,14 @@
                 return Sendmsg(fd, merge_status);
             }
         }
+        case DaemonOps::UPDATE_VERIFY: {
+            std::lock_guard<std::mutex> lock(lock_);
+            if (!UpdateVerification(&lock)) {
+                return Sendmsg(fd, "fail");
+            }
+
+            return Sendmsg(fd, "success");
+        }
         default: {
             LOG(ERROR) << "Received unknown message type from client";
             Sendmsg(fd, "fail");
@@ -453,15 +462,14 @@
 }
 
 bool UserSnapshotServer::HandleClient(android::base::borrowed_fd fd, int revents) {
-    if (revents & POLLHUP) {
-        LOG(DEBUG) << "Snapuserd client disconnected";
-        return false;
-    }
-
     std::string str;
     if (!Recv(fd, &str)) {
         return false;
     }
+    if (str.empty() && (revents & POLLHUP)) {
+        LOG(DEBUG) << "Snapuserd client disconnected";
+        return false;
+    }
     if (!Receivemsg(fd, str)) {
         LOG(ERROR) << "Encountered error handling client message, revents: " << revents;
         return false;
@@ -641,6 +649,12 @@
             while (active_merge_threads_ < kMaxMergeThreads && merge_handlers_.size() > 0) {
                 auto handler = merge_handlers_.front();
                 merge_handlers_.pop();
+
+                if (!handler->snapuserd()) {
+                    LOG(INFO) << "MonitorMerge: skipping deleted handler: " << handler->misc_name();
+                    continue;
+                }
+
                 LOG(INFO) << "Starting merge for partition: "
                           << handler->snapuserd()->GetMiscName();
                 handler->snapuserd()->InitiateMerge();
@@ -699,7 +713,7 @@
 
     // We don't care if the ACK is received.
     code[0] = 'a';
-    if (TEMP_FAILURE_RETRY(send(fd, code, sizeof(code), MSG_NOSIGNAL) < 0)) {
+    if (TEMP_FAILURE_RETRY(send(fd, code, sizeof(code), MSG_NOSIGNAL)) < 0) {
         PLOG(ERROR) << "Failed to send ACK to proxy";
         return false;
     }
@@ -750,5 +764,22 @@
     return true;
 }
 
+bool UserSnapshotServer::UpdateVerification(std::lock_guard<std::mutex>* proof_of_lock) {
+    CHECK(proof_of_lock);
+
+    bool status = true;
+    for (auto iter = dm_users_.begin(); iter != dm_users_.end(); iter++) {
+        auto& th = (*iter)->thread();
+        if (th.joinable() && status) {
+            status = (*iter)->snapuserd()->CheckPartitionVerification() && status;
+        } else {
+            // return immediately if there is a failure
+            return false;
+        }
+    }
+
+    return status;
+}
+
 }  // namespace snapshot
 }  // namespace android
diff --git a/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_server.h b/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_server.h
index e0844ae..c2af61f 100644
--- a/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_server.h
+++ b/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_server.h
@@ -50,6 +50,7 @@
     INITIATE,
     PERCENTAGE,
     GETSTATUS,
+    UPDATE_VERIFY,
     INVALID,
 };
 
@@ -130,6 +131,8 @@
     double GetMergePercentage(std::lock_guard<std::mutex>* proof_of_lock);
     void TerminateMergeThreads(std::lock_guard<std::mutex>* proof_of_lock);
 
+    bool UpdateVerification(std::lock_guard<std::mutex>* proof_of_lock);
+
   public:
     UserSnapshotServer();
     ~UserSnapshotServer();
diff --git a/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_verify.cpp b/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_verify.cpp
new file mode 100644
index 0000000..18c1dfc
--- /dev/null
+++ b/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_verify.cpp
@@ -0,0 +1,222 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "snapuserd_core.h"
+
+#include <android-base/chrono_utils.h>
+#include <android-base/scopeguard.h>
+#include <android-base/strings.h>
+
+namespace android {
+namespace snapshot {
+
+using namespace android;
+using namespace android::dm;
+using android::base::unique_fd;
+
+UpdateVerify::UpdateVerify(const std::string& misc_name)
+    : misc_name_(misc_name), state_(UpdateVerifyState::VERIFY_UNKNOWN) {}
+
+bool UpdateVerify::CheckPartitionVerification() {
+    auto now = std::chrono::system_clock::now();
+    auto deadline = now + 10s;
+    {
+        std::unique_lock<std::mutex> cv_lock(m_lock_);
+        while (state_ == UpdateVerifyState::VERIFY_UNKNOWN) {
+            auto status = m_cv_.wait_until(cv_lock, deadline);
+            if (status == std::cv_status::timeout) {
+                return false;
+            }
+        }
+    }
+
+    return (state_ == UpdateVerifyState::VERIFY_SUCCESS);
+}
+
+void UpdateVerify::UpdatePartitionVerificationState(UpdateVerifyState state) {
+    {
+        std::lock_guard<std::mutex> lock(m_lock_);
+        state_ = state;
+    }
+    m_cv_.notify_all();
+}
+
+void UpdateVerify::VerifyUpdatePartition() {
+    bool succeeded = false;
+
+    auto scope_guard = android::base::make_scope_guard([this, &succeeded]() -> void {
+        if (!succeeded) {
+            UpdatePartitionVerificationState(UpdateVerifyState::VERIFY_FAILED);
+        }
+    });
+
+    auto& dm = DeviceMapper::Instance();
+    auto dm_block_devices = dm.FindDmPartitions();
+    if (dm_block_devices.empty()) {
+        SNAP_LOG(ERROR) << "No dm-enabled block device is found.";
+        return;
+    }
+
+    const auto parts = android::base::Split(misc_name_, "-");
+    std::string partition_name = parts[0];
+
+    constexpr auto&& suffix_b = "_b";
+    constexpr auto&& suffix_a = "_a";
+
+    partition_name.erase(partition_name.find_last_not_of(suffix_b) + 1);
+    partition_name.erase(partition_name.find_last_not_of(suffix_a) + 1);
+
+    if (dm_block_devices.find(partition_name) == dm_block_devices.end()) {
+        SNAP_LOG(ERROR) << "Failed to find dm block device for " << partition_name;
+        return;
+    }
+
+    if (!VerifyPartition(partition_name, dm_block_devices.at(partition_name))) {
+        SNAP_LOG(ERROR) << "Partition: " << partition_name
+                        << " Block-device: " << dm_block_devices.at(partition_name)
+                        << " verification failed";
+    }
+    succeeded = true;
+}
+
+bool UpdateVerify::VerifyBlocks(const std::string& partition_name,
+                                const std::string& dm_block_device, off_t offset, int skip_blocks,
+                                uint64_t dev_sz) {
+    unique_fd fd(TEMP_FAILURE_RETRY(open(dm_block_device.c_str(), O_RDONLY | O_DIRECT)));
+    if (fd < 0) {
+        SNAP_LOG(ERROR) << "open failed: " << dm_block_device;
+        return false;
+    }
+
+    loff_t file_offset = offset;
+    const uint64_t read_sz = kBlockSizeVerify;
+
+    void* addr;
+    ssize_t page_size = getpagesize();
+    if (posix_memalign(&addr, page_size, read_sz) < 0) {
+        SNAP_PLOG(ERROR) << "posix_memalign failed "
+                         << " page_size: " << page_size << " read_sz: " << read_sz;
+        return false;
+    }
+
+    std::unique_ptr<void, decltype(&::free)> buffer(addr, ::free);
+
+    uint64_t bytes_read = 0;
+
+    while (true) {
+        size_t to_read = std::min((dev_sz - file_offset), read_sz);
+
+        if (!android::base::ReadFullyAtOffset(fd.get(), buffer.get(), to_read, file_offset)) {
+            SNAP_PLOG(ERROR) << "Failed to read block from block device: " << dm_block_device
+                             << " partition-name: " << partition_name
+                             << " at offset: " << file_offset << " read-size: " << to_read
+                             << " block-size: " << dev_sz;
+            return false;
+        }
+
+        bytes_read += to_read;
+        file_offset += (skip_blocks * kBlockSizeVerify);
+        if (file_offset >= dev_sz) {
+            break;
+        }
+    }
+
+    SNAP_LOG(DEBUG) << "Verification success with bytes-read: " << bytes_read
+                    << " dev_sz: " << dev_sz << " partition_name: " << partition_name;
+
+    return true;
+}
+
+bool UpdateVerify::VerifyPartition(const std::string& partition_name,
+                                   const std::string& dm_block_device) {
+    android::base::Timer timer;
+
+    SNAP_LOG(INFO) << "VerifyPartition: " << partition_name << " Block-device: " << dm_block_device;
+
+    bool succeeded = false;
+    auto scope_guard = android::base::make_scope_guard([this, &succeeded]() -> void {
+        if (!succeeded) {
+            UpdatePartitionVerificationState(UpdateVerifyState::VERIFY_FAILED);
+        }
+    });
+
+    unique_fd fd(TEMP_FAILURE_RETRY(open(dm_block_device.c_str(), O_RDONLY | O_DIRECT)));
+    if (fd < 0) {
+        SNAP_LOG(ERROR) << "open failed: " << dm_block_device;
+        return false;
+    }
+
+    uint64_t dev_sz = get_block_device_size(fd.get());
+    if (!dev_sz) {
+        SNAP_PLOG(ERROR) << "Could not determine block device size: " << dm_block_device;
+        return false;
+    }
+
+    if (!IsBlockAligned(dev_sz)) {
+        SNAP_LOG(ERROR) << "dev_sz: " << dev_sz << " is not block aligned";
+        return false;
+    }
+
+    /*
+     * Not all partitions are of same size. Some partitions are as small as
+     * 100Mb. We can just finish them in a single thread. For bigger partitions
+     * such as product, 4 threads are sufficient enough.
+     *
+     * TODO: With io_uring SQ_POLL support, we can completely cut this
+     * down to just single thread for all partitions and potentially verify all
+     * the partitions with zero syscalls. Additionally, since block layer
+     * supports polling, IO_POLL could be used which will further cut down
+     * latency.
+     */
+    int num_threads = kMinThreadsToVerify;
+    if (dev_sz > kThresholdSize) {
+        num_threads = kMaxThreadsToVerify;
+    }
+
+    std::vector<std::future<bool>> threads;
+    off_t start_offset = 0;
+    const int skip_blocks = num_threads;
+
+    while (num_threads) {
+        threads.emplace_back(std::async(std::launch::async, &UpdateVerify::VerifyBlocks, this,
+                                        partition_name, dm_block_device, start_offset, skip_blocks,
+                                        dev_sz));
+        start_offset += kBlockSizeVerify;
+        num_threads -= 1;
+        if (start_offset >= dev_sz) {
+            break;
+        }
+    }
+
+    bool ret = true;
+    for (auto& t : threads) {
+        ret = t.get() && ret;
+    }
+
+    if (ret) {
+        succeeded = true;
+        UpdatePartitionVerificationState(UpdateVerifyState::VERIFY_SUCCESS);
+        SNAP_LOG(INFO) << "Partition: " << partition_name << " Block-device: " << dm_block_device
+                       << " Size: " << dev_sz
+                       << " verification success. Duration : " << timer.duration().count() << " ms";
+        return true;
+    }
+
+    return false;
+}
+
+}  // namespace snapshot
+}  // namespace android
diff --git a/fs_mgr/libsnapshot/test_helpers.cpp b/fs_mgr/libsnapshot/test_helpers.cpp
index 71fe124..b05123a 100644
--- a/fs_mgr/libsnapshot/test_helpers.cpp
+++ b/fs_mgr/libsnapshot/test_helpers.cpp
@@ -18,10 +18,12 @@
 
 #include <android-base/file.h>
 #include <android-base/logging.h>
+#include <android-base/parsebool.h>
 #include <android-base/properties.h>
 #include <android-base/strings.h>
 #include <android-base/unique_fd.h>
 #include <gtest/gtest.h>
+#include <liblp/property_fetcher.h>
 #include <openssl/sha.h>
 #include <payload_consumer/file_descriptor.h>
 
@@ -128,48 +130,6 @@
     return true;
 }
 
-bool WriteRandomData(ICowWriter* writer, std::string* hash) {
-    unique_fd rand(open("/dev/urandom", O_RDONLY));
-    if (rand < 0) {
-        PLOG(ERROR) << "open /dev/urandom";
-        return false;
-    }
-
-    SHA256_CTX ctx;
-    if (hash) {
-        SHA256_Init(&ctx);
-    }
-
-    if (!writer->options().max_blocks) {
-        LOG(ERROR) << "CowWriter must specify maximum number of blocks";
-        return false;
-    }
-    uint64_t num_blocks = writer->options().max_blocks.value();
-
-    size_t block_size = writer->options().block_size;
-    std::string block(block_size, '\0');
-    for (uint64_t i = 0; i < num_blocks; i++) {
-        if (!ReadFully(rand, block.data(), block.size())) {
-            PLOG(ERROR) << "read /dev/urandom";
-            return false;
-        }
-        if (!writer->AddRawBlocks(i, block.data(), block.size())) {
-            LOG(ERROR) << "Failed to add raw block " << i;
-            return false;
-        }
-        if (hash) {
-            SHA256_Update(&ctx, block.data(), block.size());
-        }
-    }
-
-    if (hash) {
-        uint8_t out[32];
-        SHA256_Final(out, &ctx);
-        *hash = ToHexString(out, sizeof(out));
-    }
-    return true;
-}
-
 std::string HashSnapshot(ISnapshotWriter* writer) {
     auto reader = writer->OpenReader();
     if (!reader) {
@@ -320,5 +280,38 @@
     return android::base::GetBoolProperty("ro.virtual_ab.enabled", false);
 }
 
+SnapshotTestPropertyFetcher::SnapshotTestPropertyFetcher(
+        const std::string& slot_suffix, std::unordered_map<std::string, std::string>&& props)
+    : properties_(std::move(props)) {
+    properties_["ro.boot.slot_suffix"] = slot_suffix;
+    properties_["ro.boot.dynamic_partitions"] = "true";
+    properties_["ro.boot.dynamic_partitions_retrofit"] = "false";
+    properties_["ro.virtual_ab.enabled"] = "true";
+}
+
+std::string SnapshotTestPropertyFetcher::GetProperty(const std::string& key,
+                                                     const std::string& defaultValue) {
+    auto iter = properties_.find(key);
+    if (iter == properties_.end()) {
+        return android::base::GetProperty(key, defaultValue);
+    }
+    return iter->second;
+}
+
+bool SnapshotTestPropertyFetcher::GetBoolProperty(const std::string& key, bool defaultValue) {
+    auto iter = properties_.find(key);
+    if (iter == properties_.end()) {
+        return android::base::GetBoolProperty(key, defaultValue);
+    }
+    switch (android::base::ParseBool(iter->second)) {
+        case android::base::ParseBoolResult::kTrue:
+            return true;
+        case android::base::ParseBoolResult::kFalse:
+            return false;
+        default:
+            return defaultValue;
+    }
+}
+
 }  // namespace snapshot
 }  // namespace android
diff --git a/fs_mgr/libsnapshot/utility.cpp b/fs_mgr/libsnapshot/utility.cpp
index f01bec9..a98bf0e 100644
--- a/fs_mgr/libsnapshot/utility.cpp
+++ b/fs_mgr/libsnapshot/utility.cpp
@@ -17,6 +17,7 @@
 #include <errno.h>
 #include <time.h>
 
+#include <filesystem>
 #include <iomanip>
 #include <sstream>
 
@@ -26,6 +27,7 @@
 #include <android-base/properties.h>
 #include <android-base/strings.h>
 #include <fs_mgr/roots.h>
+#include <liblp/property_fetcher.h>
 
 using android::dm::kSectorSize;
 using android::fiemap::FiemapStatus;
@@ -33,6 +35,7 @@
 using android::fs_mgr::EnsurePathUnmounted;
 using android::fs_mgr::Fstab;
 using android::fs_mgr::GetEntryForPath;
+using android::fs_mgr::IPropertyFetcher;
 using android::fs_mgr::MetadataBuilder;
 using android::fs_mgr::Partition;
 using android::fs_mgr::ReadDefaultFstab;
@@ -150,20 +153,52 @@
     }
 }
 
-bool WriteStringToFileAtomic(const std::string& content, const std::string& path) {
-    std::string tmp_path = path + ".tmp";
-    if (!android::base::WriteStringToFile(content, tmp_path)) {
+bool FsyncDirectory(const char* dirname) {
+    android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(dirname, O_RDONLY | O_CLOEXEC)));
+    if (fd == -1) {
+        PLOG(ERROR) << "Failed to open " << dirname;
         return false;
     }
+    if (fsync(fd) == -1) {
+        if (errno == EROFS || errno == EINVAL) {
+            PLOG(WARNING) << "Skip fsync " << dirname
+                          << " on a file system does not support synchronization";
+        } else {
+            PLOG(ERROR) << "Failed to fsync " << dirname;
+            return false;
+        }
+    }
+    return true;
+}
+
+bool WriteStringToFileAtomic(const std::string& content, const std::string& path) {
+    const std::string tmp_path = path + ".tmp";
+    {
+        const int flags = O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC | O_BINARY;
+        android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(tmp_path.c_str(), flags, 0666)));
+        if (fd == -1) {
+            PLOG(ERROR) << "Failed to open " << path;
+            return false;
+        }
+        if (!android::base::WriteStringToFd(content, fd)) {
+            PLOG(ERROR) << "Failed to write to fd " << fd;
+            return false;
+        }
+        // rename() without fsync() is not safe. Data could still be living on page cache. To ensure
+        // atomiticity, call fsync()
+        if (fsync(fd) != 0) {
+            PLOG(ERROR) << "Failed to fsync " << tmp_path;
+        }
+    }
     if (rename(tmp_path.c_str(), path.c_str()) == -1) {
         PLOG(ERROR) << "rename failed from " << tmp_path << " to " << path;
         return false;
     }
-    return true;
+    return FsyncDirectory(std::filesystem::path(path).parent_path().c_str());
 }
 
 std::ostream& operator<<(std::ostream& os, const Now&) {
-    struct tm now;
+    struct tm now {};
     time_t t = time(nullptr);
     localtime_r(&t, &now);
     return os << std::put_time(&now, "%Y%m%d-%H%M%S");
@@ -184,16 +219,50 @@
     new_extent->set_num_blocks(num_blocks);
 }
 
-bool IsCompressionEnabled() {
-    return android::base::GetBoolProperty("ro.virtual_ab.compression.enabled", false);
+bool GetLegacyCompressionEnabledProperty() {
+    auto fetcher = IPropertyFetcher::GetInstance();
+    return fetcher->GetBoolProperty("ro.virtual_ab.compression.enabled", false);
 }
 
-bool IsUserspaceSnapshotsEnabled() {
-    return android::base::GetBoolProperty("ro.virtual_ab.userspace.snapshots.enabled", false);
+bool GetUserspaceSnapshotsEnabledProperty() {
+    auto fetcher = IPropertyFetcher::GetInstance();
+    return fetcher->GetBoolProperty("ro.virtual_ab.userspace.snapshots.enabled", false);
 }
 
-bool IsIouringEnabled() {
-    return android::base::GetBoolProperty("ro.virtual_ab.io_uring.enabled", false);
+bool CanUseUserspaceSnapshots() {
+    if (!GetUserspaceSnapshotsEnabledProperty()) {
+        return false;
+    }
+
+    auto fetcher = IPropertyFetcher::GetInstance();
+
+    const std::string UNKNOWN = "unknown";
+    const std::string vendor_release =
+            fetcher->GetProperty("ro.vendor.build.version.release_or_codename", UNKNOWN);
+
+    // No user-space snapshots if vendor partition is on Android 12
+    if (vendor_release.find("12") != std::string::npos) {
+        LOG(INFO) << "Userspace snapshots disabled as vendor partition is on Android: "
+                  << vendor_release;
+        return false;
+    }
+
+    if (IsDmSnapshotTestingEnabled()) {
+        LOG(INFO) << "Userspace snapshots disabled for testing";
+        return false;
+    }
+
+    return true;
+}
+
+bool GetIouringEnabledProperty() {
+    auto fetcher = IPropertyFetcher::GetInstance();
+    return fetcher->GetBoolProperty("ro.virtual_ab.io_uring.enabled", false);
+}
+
+bool GetXorCompressionEnabledProperty() {
+    auto fetcher = IPropertyFetcher::GetInstance();
+    return fetcher->GetBoolProperty("ro.virtual_ab.compression.xor.enabled", false);
 }
 
 std::string GetOtherPartitionName(const std::string& name) {
@@ -205,7 +274,8 @@
 }
 
 bool IsDmSnapshotTestingEnabled() {
-    return android::base::GetBoolProperty("snapuserd.test.dm.snapshots", false);
+    auto fetcher = IPropertyFetcher::GetInstance();
+    return fetcher->GetBoolProperty("snapuserd.test.dm.snapshots", false);
 }
 
 }  // namespace snapshot
diff --git a/fs_mgr/libsnapshot/utility.h b/fs_mgr/libsnapshot/utility.h
index 0ef3234..8c4c7c6 100644
--- a/fs_mgr/libsnapshot/utility.h
+++ b/fs_mgr/libsnapshot/utility.h
@@ -59,7 +59,6 @@
     // On destruct, delete |name| from device mapper.
     AutoUnmapDevice(android::dm::IDeviceMapper* dm, const std::string& name)
         : AutoDevice(name), dm_(dm) {}
-    AutoUnmapDevice(AutoUnmapDevice&& other) = default;
     ~AutoUnmapDevice();
 
   private:
@@ -72,7 +71,6 @@
     // On destruct, delete |name| from image manager.
     AutoUnmapImage(android::fiemap::IImageManager* images, const std::string& name)
         : AutoDevice(name), images_(images) {}
-    AutoUnmapImage(AutoUnmapImage&& other) = default;
     ~AutoUnmapImage();
 
   private:
@@ -86,7 +84,6 @@
     AutoDeleteSnapshot(SnapshotManager* manager, SnapshotManager::LockedFile* lock,
                        const std::string& name)
         : AutoDevice(name), manager_(manager), lock_(lock) {}
-    AutoDeleteSnapshot(AutoDeleteSnapshot&& other);
     ~AutoDeleteSnapshot();
 
   private:
@@ -120,6 +117,7 @@
 // Note that rename() is an atomic operation. This function may not work properly if there
 // is an open fd to |path|, because that fd has an old view of the file.
 bool WriteStringToFileAtomic(const std::string& content, const std::string& path);
+bool FsyncDirectory(const char* dirname);
 
 // Writes current time to a given stream.
 struct Now {};
@@ -129,15 +127,16 @@
 void AppendExtent(google::protobuf::RepeatedPtrField<chromeos_update_engine::Extent>* extents,
                   uint64_t start_block, uint64_t num_blocks);
 
-bool IsCompressionEnabled();
+bool GetLegacyCompressionEnabledProperty();
+bool GetUserspaceSnapshotsEnabledProperty();
+bool GetIouringEnabledProperty();
+bool GetXorCompressionEnabledProperty();
 
-bool IsUserspaceSnapshotsEnabled();
-
+bool CanUseUserspaceSnapshots();
 bool IsDmSnapshotTestingEnabled();
 
-bool IsIouringEnabled();
-
 // Swap the suffix of a partition name.
 std::string GetOtherPartitionName(const std::string& name);
+
 }  // namespace snapshot
 }  // namespace android
diff --git a/fs_mgr/libsnapshot/vts_ota_config_test.cpp b/fs_mgr/libsnapshot/vts_ota_config_test.cpp
old mode 100644
new mode 100755
index 02bcc34..d387eb3
--- a/fs_mgr/libsnapshot/vts_ota_config_test.cpp
+++ b/fs_mgr/libsnapshot/vts_ota_config_test.cpp
@@ -22,6 +22,9 @@
 }
 
 TEST(VAB, Enabled) {
+    if (!android::base::GetBoolProperty("ro.build.ab_update", false) && (GetVsrLevel() < __ANDROID_API_T__)) {
+        GTEST_SKIP();
+    }
     ASSERT_TRUE(android::base::GetBoolProperty("ro.virtual_ab.enabled", false));
     if (GetVsrLevel() < __ANDROID_API_T__) {
         GTEST_SKIP();
diff --git a/fs_mgr/tests/Android.bp b/fs_mgr/tests/Android.bp
index d82d566..b9bae25 100644
--- a/fs_mgr/tests/Android.bp
+++ b/fs_mgr/tests/Android.bp
@@ -52,9 +52,10 @@
     ],
 }
 
-cc_prebuilt_binary {
-    name: "adb-remount-test.sh",
-    srcs: ["adb-remount-test.sh"],
+sh_binary_host {
+    name: "adb-remount-test",
+    src: "adb-remount-test.sh",
+    filename_from_src: true,
     target: {
         darwin: {
             enabled: false,
@@ -62,17 +63,13 @@
         windows: {
             enabled: false,
         },
-        android: {
-            enabled: false,
-        },
     },
-    host_supported: true,
 }
 
 sh_test {
     name: "adb-remount-sh",
     src: "adb-remount-test.sh",
-    filename: "adb-remount-test.sh",
+    filename_from_src: true,
     test_suites: ["general-tests"],
     test_config: "adb-remount-sh.xml",
 }
diff --git a/fs_mgr/tests/adb-remount-test.sh b/fs_mgr/tests/adb-remount-test.sh
index 9542bc1..c87e564 100755
--- a/fs_mgr/tests/adb-remount-test.sh
+++ b/fs_mgr/tests/adb-remount-test.sh
@@ -50,15 +50,18 @@
 ESCAPE="`echo | tr '\n' '\033'`"
 # A _real_ embedded carriage return character
 CR="`echo | tr '\n' '\r'`"
-GREEN="${ESCAPE}[32m"
-RED="${ESCAPE}[31m"
-YELLOW="${ESCAPE}[33m"
-BLUE="${ESCAPE}[34m"
-NORMAL="${ESCAPE}[0m"
-TMPDIR=${TMPDIR:-/tmp}
-print_time=false
+RED=
+GREEN=
+YELLOW=
+BLUE=
+NORMAL=
+color=false
+# Assume support color if stdout is terminal.
+[ -t 1 ] && color=true
+print_time=true
 start_time=`date +%s`
 ACTIVE_SLOT=
+OVERLAYFS_BACKING="cache mnt/scratch"
 
 ADB_WAIT=4m
 FASTBOOT_WAIT=2m
@@ -68,6 +71,46 @@
 ##  Helper Functions
 ##
 
+[ "USAGE: LOG [RUN|OK|PASSED|WARNING|ERROR|FAILED|INFO] [message]..." ]
+LOG() {
+  if ${print_time}; then
+    echo -n "$(date '+%m-%d %T') "
+  fi >&2
+  case "${1}" in
+    R*)
+      shift
+      echo "${GREEN}[ RUN      ]${NORMAL}" "${@}"
+      ;;
+    OK)
+      shift
+      echo "${GREEN}[       OK ]${NORMAL}" "${@}"
+      ;;
+    P*)
+      shift
+      echo "${GREEN}[  PASSED  ]${NORMAL}" "${@}"
+      ;;
+    W*)
+      shift
+      echo "${YELLOW}[  WARNING ]${NORMAL}" "${@}"
+      ;;
+    E*)
+      shift
+      echo "${RED}[    ERROR ]${NORMAL}" "${@}"
+      ;;
+    F*)
+      shift
+      echo "${RED}[  FAILED  ]${NORMAL}" "${@}"
+      ;;
+    I*)
+      shift
+      echo "${BLUE}[     INFO ]${NORMAL}" "${@}"
+      ;;
+    *)
+      echo "${BLUE}[     INFO ]${NORMAL}" "${@}"
+      ;;
+  esac >&2
+}
+
 [ "USAGE: inFastboot
 
 Returns: true if device is in fastboot mode" ]
@@ -143,7 +186,7 @@
 
 Returns: the logcat output" ]
 adb_logcat() {
-  echo "${RED}[     INFO ]${NORMAL} logcat ${@}" >&2 &&
+  LOG INFO "logcat ${*}"
   adb logcat "${@}" </dev/null |
     tr -d '\r' |
     grep -v 'logd    : logdr: UID=' |
@@ -154,7 +197,7 @@
 
 Returns: worrisome avc violations" ]
 avc_check() {
-  if ! ${overlayfs_supported:-false}; then
+  if ! ${overlayfs_needed:-false}; then
     return
   fi
   local L=`adb_logcat -b all -v brief -d \
@@ -164,7 +207,7 @@
   if [ -z "${L}" ]; then
     return
   fi
-  echo "${YELLOW}[  WARNING ]${NORMAL} unlabeled sepolicy violations:" >&2
+  LOG WARNING "unlabeled sepolicy violations:"
   echo "${L}" | sed "s/^/${INDENT}/" >&2
 }
 
@@ -175,15 +218,6 @@
   adb_sh getprop ${1} </dev/null
 }
 
-[ "USAGE: isDebuggable
-
-Returns: true if device is (likely) a debug build" ]
-isDebuggable() {
-  if inAdb && [ 1 != "`get_property ro.debuggable`" ]; then
-    false
-  fi
-}
-
 [ "USAGE: adb_su <commands> </dev/stdin >/dev/stdout 2>/dev/stderr
 
 Returns: true if the command running as root succeeded" ]
@@ -202,17 +236,6 @@
     return ${ret}
 }
 
-[ "USAGE: adb_ls <dirfile> >stdout
-
-Returns: filename or directoru content to stdout with carriage returns skipped,
-         true if the ls had no errors" ]
-adb_ls() {
-    local OUTPUT="`adb_sh ls ${1} </dev/null 2>/dev/null`"
-    local ret=${?}
-    echo "${OUTPUT}" | tr -d '\r'
-    return ${ret}
-}
-
 [ "USAGE: adb_test <expression>
 
 Returns: exit status of the test expression" ]
@@ -227,6 +250,7 @@
   avc_check
   adb reboot remount-test </dev/null || true
   sleep 2
+  adb_wait "${ADB_WAIT}"
 }
 
 [ "USAGE: format_duration [<seconds>|<seconds>s|<minutes>m|<hours>h|<days>d]
@@ -241,15 +265,15 @@
   if [ X"${duration}" != X"${duration%s}" ]; then
     duration=${duration%s}
   elif [ X"${duration}" != X"${duration%m}" ]; then
-    duration=`expr ${duration%m} \* 60`
+    duration=$(( ${duration%m} * 60 ))
   elif [ X"${duration}" != X"${duration%h}" ]; then
-    duration=`expr ${duration%h} \* 3600`
+    duration=$(( ${duration%h} * 3600 ))
   elif [ X"${duration}" != X"${duration%d}" ]; then
-    duration=`expr ${duration%d} \* 86400`
+    duration=$(( ${duration%d} * 86400 ))
   fi
-  local seconds=`expr ${duration} % 60`
-  local minutes=`expr \( ${duration} / 60 \) % 60`
-  local hours=`expr ${duration} / 3600`
+  local seconds=$(( ${duration} % 60 ))
+  local minutes=$(( ( ${duration} / 60 ) % 60 ))
+  local hours=$(( ${duration} / 3600 ))
   if [ 0 -eq ${minutes} -a 0 -eq ${hours} ]; then
     if [ 1 -eq ${duration} ]; then
       echo 1 second
@@ -265,10 +289,10 @@
     return
   fi
   if [ 0 -eq ${hours} ]; then
-    echo ${minutes}:`expr ${seconds} / 10``expr ${seconds} % 10`
+    echo ${minutes}:$(( ${seconds} / 10 ))$(( ${seconds} % 10 ))
     return
   fi
-  echo ${hours}:`expr ${minutes} / 10``expr ${minutes} % 10`:`expr ${seconds} / 10``expr ${seconds} % 10`
+  echo ${hours}:$(( ${minutes} / 10 ))$(( ${minutes} % 10 )):$(( ${seconds} / 10 ))$(( ${seconds} % 10))
 }
 
 [ "USAGE: USB_DEVICE=\`usb_devnum [--next]\`
@@ -282,7 +306,7 @@
     if [ -n "${usb_device}" ]; then
       USB_DEVICE=dev${usb_device}
     elif [ -n "${USB_DEVICE}" -a "${1}" ]; then
-      USB_DEVICE=dev`expr ${USB_DEVICE#dev} + 1`
+      USB_DEVICE=dev$(( ${USB_DEVICE#dev} + 1 ))
     fi
     echo "${USB_DEVICE}"
   fi
@@ -298,10 +322,10 @@
   if [ -n "${1}" -a -n "`which timeout`" ]; then
     USB_DEVICE=`usb_devnum --next`
     duration=`format_duration ${1}`
-    echo -n ". . . waiting ${duration}" ${ANDROID_SERIAL} ${USB_ADDRESS} ${USB_DEVICE} "${CR}"
+    echo -n ". . . waiting ${duration}" ${ANDROID_SERIAL} ${USB_ADDRESS} ${USB_DEVICE} "${CR}" >&2
     timeout --preserve-status --signal=KILL ${1} adb wait-for-device 2>/dev/null
     ret=${?}
-    echo -n "                                                                             ${CR}"
+    echo -n "                                                                             ${CR}" >&2
   else
     adb wait-for-device
     ret=${?}
@@ -310,11 +334,11 @@
   if [ 0 = ${ret} -a -n "${ACTIVE_SLOT}" ]; then
     local active_slot=`get_active_slot`
     if [ X"${ACTIVE_SLOT}" != X"${active_slot}" ]; then
-      echo "${YELLOW}[  WARNING ]${NORMAL} Active slot changed from ${ACTIVE_SLOT} to ${active_slot}" >&2
+      LOG WARNING "Active slot changed from ${ACTIVE_SLOT} to ${active_slot}"
     fi
   fi
   local end=`date +%s`
-  local diff_time=`expr ${end} - ${start}`
+  local diff_time=$(( ${end} - ${start} ))
   local _print_time=${print_time}
   if [ ${diff_time} -lt 15 ]; then
     _print_time=false
@@ -339,8 +363,8 @@
       ;;
   esac
   if ${_print_time} || [ -n "${reason}" ]; then
-    echo "${BLUE}[     INFO ]${NORMAL} adb wait duration ${diff_time}${reason}"
-  fi >&2
+    LOG INFO "adb wait duration ${diff_time}${reason}"
+  fi
 
   return ${ret}
 }
@@ -413,8 +437,8 @@
   if [ 0 = ${ret} -a -n "${ACTIVE_SLOT}" ]; then
     local active_slot=`get_active_slot`
     if [ X"${ACTIVE_SLOT}" != X"${active_slot}" ]; then
-      echo "${YELLOW}[  WARNING ]${NORMAL} Active slot changed from ${ACTIVE_SLOT} to ${active_slot}"
-    fi >&2
+      LOG WARNING "Active slot changed from ${ACTIVE_SLOT} to ${active_slot}"
+    fi
   fi
   return ${ret}
 }
@@ -438,8 +462,8 @@
   if [ 0 = ${ret} -a -n "${ACTIVE_SLOT}" ]; then
     local active_slot=`get_active_slot`
     if [ X"${ACTIVE_SLOT}" != X"${active_slot}" ]; then
-      echo "${YELLOW}[  WARNING ]${NORMAL} Active slot changed from ${ACTIVE_SLOT} to ${active_slot}"
-    fi >&2
+      LOG WARNING "Active slot changed from ${ACTIVE_SLOT} to ${active_slot}"
+    fi
   fi
   return ${ret}
 }
@@ -494,10 +518,10 @@
         break
       fi
     fi
-    counter=`expr ${counter} + 1`
+    counter=$(( ${counter} + 1 ))
     if [ ${counter} -gt ${timeout} ]; then
       ${exit_function}
-      echo "ERROR: wait_for_screen() timed out (`format_duration ${timeout}`)" >&2
+      LOG ERROR "wait_for_screen() timed out ($(format_duration ${timeout}))"
       return 1
     fi
     sleep 1
@@ -570,22 +594,13 @@
 
 [ "USAGE: restore
 
-Do nothing: should be redefined when necessary.  Called after cleanup.
+Do nothing: should be redefined when necessary.
 
 Returns: reverses configurations" ]
 restore() {
   true
 }
 
-[ "USAGE: cleanup
-
-Do nothing: should be redefined when necessary
-
-Returns: cleans up any latent resources" ]
-cleanup() {
-  true
-}
-
 [ "USAGE: test_duration >/dev/stderr
 
 Prints the duration of the test
@@ -593,12 +608,12 @@
 Returns: reports duration" ]
 test_duration() {
   if ${print_time}; then
-    echo "${BLUE}[     INFO ]${NORMAL} end `date`"
+    LOG INFO "end $(date)"
     [ -n "${start_time}" ] || return
     end_time=`date +%s`
-    local diff_time=`expr ${end_time} - ${start_time}`
-    echo "${BLUE}[     INFO ]${NORMAL} duration `format_duration ${diff_time}`"
-  fi >&2
+    local diff_time=$(( ${end_time} - ${start_time} ))
+    LOG INFO "duration $(format_duration ${diff_time})"
+  fi
 }
 
 [ "USAGE: die [-d|-t <epoch>] [message] >/dev/stderr
@@ -618,121 +633,65 @@
     fi
     shift 2
   fi >&2
-  echo "${RED}[  FAILED  ]${NORMAL} ${@}" >&2
-  cleanup
-  restore
-  test_duration
+  LOG FAILED "${@}"
   exit 1
 }
 
-[ "USAGE: EXPECT_EQ <lval> <rval> [--warning [message]]
-
-Returns true if (regex) lval matches rval" ]
-EXPECT_EQ() {
-  local lval="${1}"
-  local rval="${2}"
-  shift 2
-  local error=1
-  local prefix="${RED}[    ERROR ]${NORMAL}"
-  if [ X"${1}" = X"--warning" ]; then
-      prefix="${RED}[  WARNING ]${NORMAL}"
-      error=0
-      shift 1
-  fi
-  if ! ( echo X"${rval}" | grep '^X'"${lval}"'$' >/dev/null 2>/dev/null ); then
-    if [ `echo ${lval}${rval}${*} | wc -c` -gt 50 -o "${rval}" != "${rval%
-*}" ]; then
-      echo "${prefix} expected \"${lval}\""
-      echo "${prefix} got \"${rval}\"" |
-        sed ": again
-             N
-             s/\(\n\)\([^ ]\)/\1${INDENT}\2/
-             t again"
-      if [ -n "${*}" ] ; then
-        echo "${prefix} ${*}"
-      fi
-    else
-      echo "${prefix} expected \"${lval}\" got \"${rval}\" ${*}"
-    fi >&2
-    return ${error}
-  fi
-  if [ -n "${*}" ] ; then
-    prefix="${GREEN}[     INFO ]${NORMAL}"
-    if [ X"${lval}" != X"${rval}" ]; then  # we were supplied a regex?
-      if [ `echo ${lval}${rval}${*} | wc -c` -gt 60 -o "${rval}" != "${rval% *}" ]; then
-        echo "${prefix} ok \"${lval}\""
-        echo "       = \"${rval}\"" |
-          sed ": again
-               N
-               s/\(\n\)\([^ ]\)/\1${INDENT}\2/
-               t again"
-        if [ -n "${*}" ] ; then
-          echo "${prefix} ${*}"
-        fi
-      else
-        echo "${prefix} ok \"${lval}\" = \"${rval}\" ${*}"
-      fi
-    else
-      echo "${prefix} ok \"${lval}\" ${*}"
-    fi >&2
-  fi
-  return 0
-}
-
-[ "USAGE: EXPECT_NE <lval> <rval> [--warning [message]]
-
-Returns true if lval matches rval" ]
-EXPECT_NE() {
-  local lval="${1}"
-  local rval="${2}"
-  shift 2
-  local error=1
-  local prefix="${RED}[    ERROR ]${NORMAL}"
-  if [ X"${1}" = X"--warning" ]; then
-      prefix="${RED}[  WARNING ]${NORMAL}"
-      error=0
-      shift 1
-  fi
-  if [ X"${rval}" = X"${lval}" ]; then
-    echo "${prefix} did not expect \"${lval}\" ${*}" >&2
-    return ${error}
-  fi
-  if [ -n "${*}" ] ; then
-    echo "${prefix} ok \"${lval}\" not \"${rval}\" ${*}" >&2
-  fi
-  return 0
-}
-
 [ "USAGE: check_eq <lval> <rval> [--warning [message]]
 
-Exits if (regex) lval mismatches rval" ]
+Exits if (regex) lval mismatches rval.
+
+Returns: true if lval matches rval" ]
 check_eq() {
   local lval="${1}"
   local rval="${2}"
   shift 2
+  if [[ "${rval}" =~ ^${lval}$ ]]; then
+    return 0
+  fi
+
+  local error=true
+  local logt=ERROR
   if [ X"${1}" = X"--warning" ]; then
-      EXPECT_EQ "${lval}" "${rval}" ${*}
-      return
+    shift 1
+    error=false
+    logt=WARNING
   fi
-  if ! EXPECT_EQ "${lval}" "${rval}"; then
-    die "${@}"
+  if [ $(( ${#lval} + ${#rval} )) -gt 40 ]; then
+    LOG "${logt}" "expected \"${lval}\"
+${INDENT}got      \"${rval}\""
+  else
+    LOG "${logt}" "expected \"${lval}\" got \"${rval}\""
   fi
+  ${error} && die "${*}"
+  [ -n "${*}" ] && LOG "${logt}" "${*}"
+  return 1
 }
 
 [ "USAGE: check_ne <lval> <rval> [--warning [message]]
 
-Exits if lval matches rval" ]
+Exits if (regex) lval matches rval.
+
+Returns: true if lval mismatches rval" ]
 check_ne() {
   local lval="${1}"
   local rval="${2}"
   shift 2
+  if ! [[ "${rval}" =~ ^${lval}$ ]]; then
+    return 0
+  fi
+
+  local error=true
+  local logt=ERROR
   if [ X"${1}" = X"--warning" ]; then
-      EXPECT_NE "${lval}" "${rval}" ${*}
-      return
+      shift 1
+      error=false
+      logt=WARNING
   fi
-  if ! EXPECT_NE "${lval}" "${rval}"; then
-    die "${@}"
-  fi
+  LOG "${logt}" "unexpected \"${rval}\""
+  ${error} && die "${*}"
+  [ -n "${*}" ] && LOG "${logt}" "${*}"
+  return 1
 }
 
 [ "USAGE: join_with <delimiter> <strings>
@@ -752,40 +711,68 @@
   echo "${result}"
 }
 
-[ "USAGE: skip_administrative_mounts [data] < /proc/mounts
+[ "USAGE: skip_administrative_mounts < /proc/mounts
 
 Filters out all administrative (eg: sysfs) mounts uninteresting to the test" ]
 skip_administrative_mounts() {
   local exclude_filesystems=(
     "overlay" "tmpfs" "none" "sysfs" "proc" "selinuxfs" "debugfs" "bpf"
     "binfmt_misc" "cg2_bpf" "pstore" "tracefs" "adb" "mtp" "ptp" "devpts"
-    "ramdumpfs" "binder" "securityfs" "functionfs" "rootfs"
+    "ramdumpfs" "binder" "securityfs" "functionfs" "rootfs" "fuse"
   )
   local exclude_devices=(
     "\/sys\/kernel\/debug" "\/data\/media" "\/dev\/block\/loop[0-9]*"
+    "\/dev\/block\/vold\/[^ ]+"
     "${exclude_filesystems[@]}"
   )
   local exclude_mount_points=(
     "\/cache" "\/mnt\/scratch" "\/mnt\/vendor\/persist" "\/persist"
-    "\/metadata"
+    "\/metadata" "\/apex\/[^ ]+"
   )
-  if [ "data" = "${1}" ]; then
-    exclude_mount_points+=("\/data")
-  fi
   awk '$1 !~ /^('"$(join_with "|" "${exclude_devices[@]}")"')$/ &&
       $2 !~ /^('"$(join_with "|" "${exclude_mount_points[@]}")"')$/ &&
       $3 !~ /^('"$(join_with "|" "${exclude_filesystems[@]}")"')$/'
 }
 
-[ "USAGE: skip_unrelated_mounts < /proc/mounts
+[ "USAGE: surgically_wipe_overlayfs
 
-or output from df
+Surgically wipe any mounted overlayfs scratch files.
 
-Filters out all apex and vendor override administrative overlay mounts
-uninteresting to the test" ]
-skip_unrelated_mounts() {
-    grep -v "^overlay.* /\(apex\|bionic\|system\|vendor\)/[^ ]" |
-      grep -v "[%] /\(data_mirror\|apex\|bionic\|system\|vendor\)/[^ ][^ ]*$"
+Returns: true if wiped anything" ]
+surgically_wipe_overlayfs() {
+  local wiped_anything=false
+  for d in ${OVERLAYFS_BACKING}; do
+    if adb_su test -d "/${d}/overlay" </dev/null; then
+      LOG INFO "/${d}/overlay is setup, surgically wiping"
+      adb_su rm -rf "/${d}/overlay" </dev/null
+      wiped_anything=true
+    fi
+  done
+  ${wiped_anything}
+}
+
+[ "USAGE: is_overlayfs_mounted [mountpoint]
+
+Diagnostic output of overlayfs df lines to stderr.
+
+Returns: true if overlayfs is mounted [on mountpoint]" ]
+is_overlayfs_mounted() {
+  local df_output=$(adb_su df -k </dev/null)
+  local df_header_line=$(echo "${df_output}" | head -1)
+  # KISS (we do not support sub-mounts for system partitions currently)
+  local overlay_mounts=$(echo "${df_output}" | tail +2 |
+                         grep -vE "[%] /(apex|system|vendor)/[^ ]+$" |
+                         awk '$1 == "overlay" || $6 == "/mnt/scratch"')
+  if ! echo "${overlay_mounts}" | grep -q '^overlay '; then
+    return 1
+  fi >/dev/null 2>/dev/null
+  ( echo "${df_header_line}"
+    echo "${overlay_mounts}"
+  ) >&2
+  if [ "${#}" -gt 0 ] && ! ( echo "${overlay_mounts}" | grep -qE " ${1}\$" ); then
+    return 1
+  fi >/dev/null 2>/dev/null
+  return 0
 }
 
 ##
@@ -798,7 +785,7 @@
          --longoptions wait-adb:,wait-fastboot:
          --longoptions wait-screen,wait-display
          --longoptions no-wait-screen,no-wait-display
-         --longoptions gtest_print_time,print-time
+         --longoptions gtest_print_time,print-time,no-print-time
          --"
 if [ "Darwin" = "${HOSTOS}" ]; then
   GETOPTS=
@@ -813,12 +800,11 @@
                  s/--wait-adb/          /g
                  s/--wait-fastboot/               /g'`"
 fi
-OPTIONS=`getopt ${GETOPTS} "?a:cCdDf:hs:t" ${*}` ||
+OPTIONS=`getopt ${GETOPTS} "?a:cCdDf:hs:tT" ${*}` ||
   ( echo "${USAGE}" >&2 ; false ) ||
   die "getopt failure"
 set -- ${OPTIONS}
 
-color=false
 while [ ${#} -gt 0 ]; do
   case ${1} in
     -h | --help | -\?)
@@ -844,6 +830,9 @@
     -t | --print-time | --gtest_print_time)
       print_time=true
       ;;
+    -T | --no-print-time)
+      print_time=false
+      ;;
     -a | --wait-adb)
       ADB_WAIT=${2}
       shift
@@ -866,42 +855,68 @@
   esac
   shift
 done
-if ! ${color}; then
-  GREEN=""
-  RED=""
-  YELLOW=""
-  BLUE=""
-  NORMAL=""
+
+if ${color}; then
+  RED="${ESCAPE}[31m"
+  GREEN="${ESCAPE}[32m"
+  YELLOW="${ESCAPE}[33m"
+  BLUE="${ESCAPE}[34m"
+  NORMAL="${ESCAPE}[0m"
 fi
 
-# Set an ERR trap handler to report any unhandled error
-trap 'die "line ${LINENO}: unhandled error"' ERR
+TMPDIR=
+
+exit_handler() {
+  [ -n "${TMPDIR}" ] && rm -rf "${TMPDIR}"
+  local err=0
+  if ! restore; then
+    LOG ERROR "restore failed"
+    err=1
+  fi >&2
+  test_duration || true
+  if [ "${err}" != 0 ]; then
+    exit "${err}"
+  fi
+}
+trap 'exit_handler' EXIT
+
+TMPDIR=$(mktemp -d)
 
 if ${print_time}; then
-  echo "${BLUE}[     INFO ]${NORMAL}" start `date` >&2
+  LOG INFO "start $(date)"
 fi
 
+if [ -z "${ANDROID_SERIAL}" ]; then
+  inAdb || die "no device or more than one device in adb mode"
+  D=$(adb devices | awk '$2 == "device" { print $1; exit }')
+  [ -n "${D}" ] || die "cannot get device serial"
+  ANDROID_SERIAL="${D}"
+fi
+export ANDROID_SERIAL
+
 inFastboot && die "device in fastboot mode"
 inRecovery && die "device in recovery mode"
 if ! inAdb; then
-  echo "${YELLOW}[  WARNING ]${NORMAL} device not in adb mode" >&2
+  LOG WARNING "device not in adb mode"
   adb_wait ${ADB_WAIT}
 fi
 inAdb || die "specified device not in adb mode"
-isDebuggable || die "device not a debug build"
+[ "1" = "$(get_property ro.debuggable)" ] || die "device not a debug build"
+[ "orange" = "$(get_property ro.boot.verifiedbootstate)" ] || die "device not bootloader unlocked"
+
+################################################################################
+# Collect characteristics of the device and report.
+can_restore_verity=true
+if [ "2" != "$(get_property partition.system.verified)" ]; then
+  LOG WARNING "device might not support verity"
+  can_restore_verity=false
+fi
 enforcing=true
 if ! adb_su getenforce </dev/null | grep 'Enforcing' >/dev/null; then
-  echo "${YELLOW}[  WARNING ]${NORMAL} device does not have sepolicy in enforcing mode" >&2
+  LOG WARNING "device does not have sepolicy in enforcing mode"
   enforcing=false
 fi
 
-# Do something.
-
-# Collect characteristics of the device and report.
-
-D=`get_property ro.serialno`
-[ -n "${D}" ] || D=`get_property ro.boot.serialno`
-[ -z "${D}" -o -n "${ANDROID_SERIAL}" ] || ANDROID_SERIAL=${D}
 USB_SERIAL=
 if [ -n "${ANDROID_SERIAL}" -a "Darwin" != "${HOSTOS}" ]; then
   USB_SERIAL="`find /sys/devices -name serial | grep usb || true`"
@@ -915,35 +930,47 @@
   USB_ADDRESS=${USB_SERIAL%/serial}
   USB_ADDRESS=usb${USB_ADDRESS##*/}
 fi
-[ -z "${ANDROID_SERIAL}${USB_ADDRESS}" ] ||
-  USB_DEVICE=`usb_devnum`
-  echo "${BLUE}[     INFO ]${NORMAL}" ${ANDROID_SERIAL} ${USB_ADDRESS} ${USB_DEVICE} >&2
+USB_DEVICE=$(usb_devnum)
+[ -z "${ANDROID_SERIAL}${USB_ADDRESS}${USB_DEVICE}" ] ||
+  LOG INFO "${ANDROID_SERIAL} ${USB_ADDRESS} ${USB_DEVICE}"
 BUILD_DESCRIPTION=`get_property ro.build.description`
 [ -z "${BUILD_DESCRIPTION}" ] ||
-  echo "${BLUE}[     INFO ]${NORMAL} ${BUILD_DESCRIPTION}" >&2
+  LOG INFO "${BUILD_DESCRIPTION}"
 KERNEL_VERSION="`adb_su cat /proc/version </dev/null 2>/dev/null`"
 [ -z "${KERNEL_VERSION}" ] ||
-  echo "${BLUE}[     INFO ]${NORMAL} ${KERNEL_VERSION}" >&2
+  LOG INFO "${KERNEL_VERSION}"
 ACTIVE_SLOT=`get_active_slot`
 [ -z "${ACTIVE_SLOT}" ] ||
-  echo "${BLUE}[     INFO ]${NORMAL} active slot is ${ACTIVE_SLOT}" >&2
+  LOG INFO "active slot is ${ACTIVE_SLOT}"
 
 # Acquire list of system partitions
+FSTAB_SUFFIXES=(
+  "$(get_property ro.boot.fstab_suffix)"
+  "$(get_property ro.boot.hardware)"
+  "$(get_property ro.boot.hardware.platform)"
+)
+FSTAB_PATTERN='\.('"$(join_with "|" "${FSTAB_SUFFIXES[@]}")"')$'
+FSTAB_FILE=$(adb_su ls -1 '/vendor/etc/fstab*' </dev/null |
+             grep -E "${FSTAB_PATTERN}" |
+             head -1)
 
 # KISS (assume system partition mount point is "/<partition name>")
-PARTITIONS=`adb_su cat /vendor/etc/fstab* </dev/null |
-              grep -v "^[#${SPACE}${TAB}]" |
-              skip_administrative_mounts |
-              awk '$1 ~ /^[^\/]+$/ && "/"$1 == $2 && $4 ~ /(^|,)ro(,|$)/ { print $1 }' |
-              sort -u |
-              tr '\n' ' '`
-PARTITIONS="${PARTITIONS:-system vendor}"
+if [ -n "${FSTAB_FILE}" ]; then
+  PARTITIONS=$(adb_su grep -v "^[#${SPACE}${TAB}]" "${FSTAB_FILE}" |
+               skip_administrative_mounts |
+               awk '$1 ~ /^[^\/]+$/ && "/"$1 == $2 && $4 ~ /(^|,)ro(,|$)/ { print $1 }' |
+               sort -u |
+               tr '\n' ' ')
+else
+  PARTITIONS="system vendor"
+fi
+
 # KISS (we do not support sub-mounts for system partitions currently)
-MOUNTS="`for i in ${PARTITIONS}; do
-           echo /${i}
-         done |
-         tr '\n' ' '`"
-echo "${BLUE}[     INFO ]${NORMAL} System Partitions list: ${PARTITIONS}" >&2
+# Ensure /system and /vendor mountpoints are in mounts list
+MOUNTS=$(for i in system vendor ${PARTITIONS}; do
+           echo "/${i}"
+         done | sort -u | tr '\n' ' ')
+LOG INFO "System Partitions list: ${PARTITIONS}"
 
 # Report existing partition sizes
 adb_sh ls -l /dev/block/by-name/ /dev/block/mapper/ </dev/null 2>/dev/null |
@@ -964,425 +991,393 @@
         ;;
     esac
     size=`adb_su cat /sys/block/${device}/size 2>/dev/null </dev/null` &&
-      size=`expr ${size} / 2` &&
-      echo "${BLUE}[     INFO ]${NORMAL} partition ${name} device ${device} size ${size}K" >&2
+      size=$(( ${size} / 2 )) &&
+      LOG INFO "partition ${name} device ${device} size ${size}K"
   done
 
+restore() {
+  LOG INFO "restoring device"
+  inFastboot &&
+    fastboot reboot &&
+    adb_wait "${ADB_WAIT}" ||
+    true
+  if ! inAdb; then
+    LOG ERROR "expect adb device"
+    return 1
+  fi
+  adb_root || true
+  local reboot=false
+  if surgically_wipe_overlayfs; then
+    reboot=true
+  fi
+  if ${can_restore_verity}; then
+    if ! adb enable-verity; then
+      LOG ERROR "adb enable-verity"
+      return 1
+    fi
+    LOG INFO "restored verity"
+    reboot=true
+  fi >&2
+  if ${reboot}; then
+    adb_reboot
+  fi
+}
+
 # If reboot too soon after fresh flash, could trip device update failure logic
 if ${screen_wait}; then
-  echo "${YELLOW}[  WARNING ]${NORMAL} waiting for screen to come up. Consider --no-wait-screen option" >&2
+  LOG INFO "waiting for screen to come up. Consider --no-wait-screen option"
 fi
 if ! wait_for_screen && ${screen_wait}; then
   screen_wait=false
-  echo "${YELLOW}[  WARNING ]${NORMAL} not healthy, no launcher, skipping wait for screen" >&2
+  LOG WARNING "not healthy, no launcher, skipping wait for screen"
 fi
 
-# Can we test remount -R command?
-OVERLAYFS_BACKING="cache mnt/scratch"
-overlayfs_supported=true
-if [ "orange" != "`get_property ro.boot.verifiedbootstate`" -o \
-     "2" != "`get_property partition.system.verified`" ]; then
-  restore() {
-    ${overlayfs_supported} || return 0
-    inFastboot &&
-      fastboot reboot &&
-      adb_wait ${ADB_WAIT} ||
-      true
-    if inAdb; then
-      reboot=false
-      for d in ${OVERLAYFS_BACKING}; do
-        if adb_test -d /${d}/overlay; then
-          adb_su rm -rf /${d}/overlay </dev/null
-          reboot=true
-        fi
-      done
-      if ${reboot}; then
-        adb_reboot &&
-        adb_wait ${ADB_WAIT}
-      fi
-    fi
-  }
-else
-  restore() {
-    ${overlayfs_supported} || return 0
-    inFastboot &&
-      fastboot reboot &&
-      adb_wait ${ADB_WAIT} ||
-      true
-    inAdb &&
-      adb_root &&
-      adb enable-verity >/dev/null 2>/dev/null &&
-      adb_reboot &&
-      adb_wait ${ADB_WAIT}
-  }
-
-  echo "${GREEN}[ RUN      ]${NORMAL} Testing adb shell su root remount -R command" >&2
-
-  avc_check
-  T=`adb_date`
-  adb_su remount -R system </dev/null
-  err=${?}
-  if [ "${err}" != 0 ]; then
-    echo "${YELLOW}[  WARNING ]${NORMAL} adb shell su root remount -R system = ${err}, likely did not reboot!" >&2
-    T="-t ${T}"
-  else
-    # Rebooted, logcat will be meaningless, and last logcat will likely be clear
-    T=""
-  fi
-  sleep 2
-  adb_wait ${ADB_WAIT} ||
-    die "waiting for device after adb shell su root remount -R system `usb_status`"
-  if [ "orange" != "`get_property ro.boot.verifiedbootstate`" -o \
-       "2" = "`get_property partition.system.verified`" ]; then
-    die ${T} "remount -R command failed
-${INDENT}ro.boot.verifiedbootstate=\"`get_property ro.boot.verifiedbootstate`\"
-${INDENT}partition.system.verified=\"`get_property partition.system.verified`\""
-  fi
-
-  echo "${GREEN}[       OK ]${NORMAL} adb shell su root remount -R command" >&2
-fi
-
-echo "${GREEN}[ RUN      ]${NORMAL} Testing kernel support for overlayfs" >&2
+################################################################################
+LOG RUN "Checking current overlayfs status"
 
 adb_wait || die "wait for device failed"
-adb_root ||
-  die "initial setup"
-
-adb_test -d /sys/module/overlay ||
-  adb_sh grep "nodev${TAB}overlay" /proc/filesystems </dev/null >/dev/null 2>/dev/null &&
-  echo "${GREEN}[       OK ]${NORMAL} overlay module present" >&2 ||
-  (
-    echo "${YELLOW}[  WARNING ]${NORMAL} overlay module not present" >&2 &&
-      false
-  ) ||
-  overlayfs_supported=false
-if ${overlayfs_supported}; then
-  adb_test -f /sys/module/overlay/parameters/override_creds &&
-    echo "${GREEN}[       OK ]${NORMAL} overlay module supports override_creds" >&2 ||
-    case `adb_sh uname -r </dev/null` in
-      4.[456789].* | 4.[1-9][0-9]* | [56789].*)
-        echo "${YELLOW}[  WARNING ]${NORMAL} overlay module does not support override_creds" >&2 &&
-        overlayfs_supported=false
-        ;;
-      *)
-        echo "${GREEN}[       OK ]${NORMAL} overlay module uses caller's creds" >&2
-        ;;
-    esac
-fi
-
-echo "${GREEN}[ RUN      ]${NORMAL} Checking current overlayfs status" >&2
+adb_root || die "adb root failed"
 
 # We can not universally use adb enable-verity to ensure device is
 # in a overlayfs disabled state since it can prevent reboot on
 # devices that remount the physical content rather than overlayfs.
 # So lets do our best to surgically wipe the overlayfs state without
 # having to go through enable-verity transition.
-reboot=false
-for d in ${OVERLAYFS_BACKING}; do
-  if adb_test -d /${d}/overlay; then
-    echo "${YELLOW}[  WARNING ]${NORMAL} /${d}/overlay is setup, surgically wiping" >&2
-    adb_sh rm -rf /${d}/overlay </dev/null ||
-      die "/${d}/overlay wipe"
-    reboot=true
-  fi
-done
-if ${reboot}; then
-  echo "${YELLOW}[  WARNING ]${NORMAL} rebooting before test" >&2
-  adb_reboot &&
-    adb_wait ${ADB_WAIT} ||
-    die "lost device after reboot after wipe `usb_status`"
+if surgically_wipe_overlayfs; then
+  LOG WARNING "rebooting before test"
+  adb_reboot ||
+    die "lost device after reboot after overlay wipe $(usb_status)"
   adb_root ||
     die "lost device after elevation to root after wipe `usb_status`"
 fi
-D=`adb_sh df -k </dev/null` &&
-  H=`echo "${D}" | head -1` &&
-  D=`echo "${D}" | grep -v " /vendor/..*$" | grep "^overlay "` &&
-  echo "${H}" &&
-  echo "${D}" &&
-  echo "${YELLOW}[  WARNING ]${NORMAL} overlays present before setup" >&2 ||
-  echo "${GREEN}[       OK ]${NORMAL} no overlay present before setup" >&2
+is_overlayfs_mounted &&
+  die "overlay takeover unexpected at this phase"
+
 overlayfs_needed=true
-D=`adb_sh cat /proc/mounts </dev/null |
-   skip_administrative_mounts data`
-if echo "${D}" | grep /dev/root >/dev/null; then
-  D=`echo / /
-     echo "${D}" | grep -v /dev/root`
-fi
-D=`echo "${D}" | cut -s -d' ' -f1 | sort -u`
+data_device=$(adb_sh awk '$2 == "/data" { print $1; exit }' /proc/mounts)
+D=$(adb_sh grep " ro," /proc/mounts </dev/null |
+    grep -v "^${data_device}" |
+    skip_administrative_mounts |
+    awk '{ print $1 }' |
+    sed 's|/dev/root|/|' |
+    sort -u)
 no_dedupe=true
 for d in ${D}; do
   adb_sh tune2fs -l $d </dev/null 2>&1 |
     grep "Filesystem features:.*shared_blocks" >/dev/null &&
   no_dedupe=false
 done
-D=`adb_sh df -k ${D} </dev/null |
-   sed 's@\([%] /\)\(apex\|bionic\|system\|vendor\)/[^ ][^ ]*$@\1@'`
-echo "${D}"
+D=$(adb_sh df -k ${D} </dev/null)
+echo "${D}" >&2
 if [ X"${D}" = X"${D##* 100[%] }" ] && ${no_dedupe} ; then
   overlayfs_needed=false
   # if device does not need overlays, then adb enable-verity will brick device
-  restore() {
-    ${overlayfs_supported} || return 0
-    inFastboot &&
-      fastboot reboot &&
-      adb_wait ${ADB_WAIT}
-    inAdb &&
-      adb_wait ${ADB_WAIT}
-  }
-elif ! ${overlayfs_supported}; then
-  die "need overlayfs, but do not have it"
+  can_restore_verity=false
 fi
+LOG OK "no overlay present before setup"
 
-echo "${GREEN}[ RUN      ]${NORMAL} disable verity" >&2
+################################################################################
+# Precondition is overlayfs *not* setup.
+LOG RUN "Testing adb disable-verity -R"
 
-T=`adb_date`
-H=`adb disable-verity 2>&1`
-err=${?}
-L=
-D="${H%?Now reboot your device for settings to take effect*}"
-if [ X"${D}" != X"${D##*[Uu]sing overlayfs}" ]; then
-  echo "${GREEN}[       OK ]${NORMAL} using overlayfs" >&2
+T=$(adb_date)
+adb_su disable-verity -R >&2 ||
+  die -t "${T}" "disable-verity -R failed"
+sleep 2
+adb_wait "${ADB_WAIT}" ||
+  die "lost device after adb disable-verity -R $(usb_status)"
+
+if [ "2" = "$(get_property partition.system.verified)" ]; then
+  LOG ERROR "partition.system.verified=$(get_property partition.system.verified)"
+  die "verity not disabled after adb disable-verity -R"
 fi
-if [ ${err} != 0 ]; then
-  echo "${H}"
-  ( [ -n "${L}" ] && echo "${L}" && false ) ||
-  die -t "${T}" "disable-verity"
+if ${overlayfs_needed}; then
+  is_overlayfs_mounted ||
+    die -d "no overlay takeover after adb disable-verity -R"
+  LOG OK "overlay takeover after adb disable-verity -R"
 fi
-rebooted=false
-if [ X"${D}" != X"${H}" ]; then
-  echo "${H}"
-  if [ X"${D}" != X"${D##*setup failed}" ]; then
-    echo "${YELLOW}[  WARNING ]${NORMAL} overlayfs setup whined" >&2
-  fi
-  D=`adb_sh df -k </dev/null` &&
-    H=`echo "${D}" | head -1` &&
-    D=`echo "${D}" | grep -v " /vendor/..*$" | grep "^overlay " || true` &&
-    [ -z "${D}" ] ||
-    ( echo "${H}" && echo "${D}" && false ) ||
-    die -t ${T} "overlay takeover unexpected at this phase"
-  echo "${GREEN}[     INFO ]${NORMAL} rebooting as requested" >&2
-  L=`adb_logcat -b all -v nsec -t ${T} 2>&1`
-  adb_reboot &&
-    adb_wait ${ADB_WAIT} ||
-    die "lost device after reboot requested `usb_status`"
-  adb_root ||
-    die "lost device after elevation to root `usb_status`"
-  rebooted=true
-  # re-disable verity to see the setup remarks expected
-  T=`adb_date`
-  H=`adb disable-verity 2>&1`
-  err=${?}
-  D="${H%?Now reboot your device for settings to take effect*}"
-  if [ X"${D}" != X"${D##*[Uu]sing overlayfs}" ]; then
-    echo "${GREEN}[       OK ]${NORMAL} using overlayfs" >&2
-  fi
-  if [ ${err} != 0 ]; then
-    T=
-  fi
-fi
-if ${overlayfs_supported} && ${overlayfs_needed} && [ X"${D}" != X"${D##*setup failed}" ]; then
-  echo "${D}"
-  ( [ -n "${L}" ] && echo "${L}" && false ) ||
-  die -t "${T}" "setup for overlay"
-fi
-if [ X"${D}" != X"${D##*Successfully disabled verity}" ]; then
-  echo "${H}"
-  D=`adb_sh df -k </dev/null` &&
-    H=`echo "${D}" | head -1` &&
-    D=`echo "${D}" | grep -v " /vendor/..*$" | grep "^overlay " || true` &&
-    [ -z "${D}" ] ||
-    ( echo "${H}" && echo "${D}" && false ) ||
-    ( [ -n "${L}" ] && echo "${L}" && false ) ||
-    die -t "${T}" "overlay takeover unexpected"
-  [ -n "${L}" ] && echo "${L}"
-  die -t "${T}" "unexpected report of verity being disabled a second time"
-elif ${rebooted}; then
-  echo "${GREEN}[       OK ]${NORMAL} verity already disabled" >&2
+LOG OK "adb disable-verity -R"
+
+################################################################################
+LOG RUN "Checking kernel has overlayfs required patches"
+
+adb_root || die "adb root"
+if adb_test -d /sys/module/overlay ||
+    adb_sh grep -q "nodev${TAB}overlay" /proc/filesystems; then
+  LOG OK "overlay module present"
 else
-  echo "${YELLOW}[  WARNING ]${NORMAL} verity already disabled" >&2
+  LOG INFO "overlay module not present"
+fi
+if is_overlayfs_mounted 2>/dev/null; then
+  if adb_test -f /sys/module/overlay/parameters/override_creds; then
+    LOG OK "overlay module supports override_creds"
+  else
+    case "$(adb_sh uname -r </dev/null)" in
+      4.[456789].* | 4.[1-9][0-9]* | [56789].*)
+        die "overlay module does not support override_creds"
+        ;;
+      *)
+        LOG OK "overlay module uses caller's creds"
+        ;;
+    esac
+  fi
 fi
 
-echo "${GREEN}[ RUN      ]${NORMAL} remount" >&2
+################################################################################
+# Precondition is a verity-disabled device with overlayfs already setup.
+LOG RUN "Testing raw remount commands"
+
+adb_sh grep -qE " (/system|/) [^ ]* rw," /proc/mounts </dev/null &&
+  die "/system is not RO"
+adb_sh grep -q " /vendor [^ ]* rw," /proc/mounts </dev/null &&
+  die "/vendor is not RO"
+
+T=$(adb_date)
+adb_su mount -o remount,rw /vendor ||
+  die -t "${T}" "mount -o remount,rw /vendor"
+adb_sh grep -q " /vendor [^ ]* rw," /proc/mounts </dev/null ||
+  die "/vendor is not RW after mount -o remount,rw"
+LOG OK "mount -o remount,rw"
+
+T=$(adb_date)
+adb_su mount -o remount,ro /vendor ||
+  die -t "${T}" "mount -o remount,ro /vendor"
+adb_sh grep -q " /vendor [^ ]* rw," /proc/mounts </dev/null &&
+  die "/vendor is not RO after mount -o remount,ro"
+LOG OK "mount -o remount,ro"
+
+T=$(adb_date)
+adb_su remount vendor >&2 ||
+  die -t "${T}" "adb remount vendor"
+adb_sh grep -q " /vendor [^ ]* rw," /proc/mounts </dev/null ||
+  die -t "${T}" "/vendor is not RW after adb remount vendor"
+adb_sh grep -qE " (/system|/) [^ ]* rw," /proc/mounts </dev/null &&
+  die -t "${T}" "/system is not RO after adb remount vendor"
+LOG OK "adb remount vendor"
+
+LOG INFO "Restoring device RO state and destroying overlayfs"
+T=$(adb_date)
+adb_su mount -o remount,ro /vendor ||
+  die -t "${T}" "mount -o remount,ro /vendor"
+if surgically_wipe_overlayfs; then
+  adb_reboot ||
+    die "lost device after reboot after overlay wipe $(usb_status)"
+fi
+is_overlayfs_mounted &&
+  die "overlay takeover unexpected at this phase"
+
+################################################################################
+# Precondition is a verity-disabled device with overlayfs *not* setup.
+LOG RUN "Testing adb remount performs overlayfs setup from scratch"
+
+adb_sh grep -q " /vendor [^ ]* rw," /proc/mounts </dev/null &&
+  die "/vendor is not RO"
+T=$(adb_date)
+adb_su remount vendor >&2 ||
+  die -t "${T}" "adb remount vendor from scratch"
+if ${overlayfs_needed}; then
+  is_overlayfs_mounted /vendor ||
+    die -t "${T}" "expected overlay takeover /vendor"
+  is_overlayfs_mounted /system 2>/dev/null &&
+    die -t "${T}" "unexpected overlay takeover /system"
+fi
+adb_sh grep -q " /vendor [^ ]* rw," /proc/mounts </dev/null ||
+  die -t "${T}" "/vendor is not RW after adb remount vendor"
+adb_sh grep -qE " (/system|/) [^ ]* rw," /proc/mounts </dev/null &&
+  die -t "${T}" "/system is not RO after adb remount vendor"
+LOG OK "adb remount from scratch"
+
+################################################################################
+# Precondition is overlayfs partially setup by previous test.
+LOG RUN "Testing adb remount -R"
+
+T=$(adb_date)
+adb_su remount -R </dev/null >&2 ||
+  die -t "${T}" "adb remount -R failed"
+sleep 2
+adb_wait "${ADB_WAIT}" ||
+  die "lost device after adb remount -R $(usb_status)"
+
+if [ "2" = "$(get_property partition.system.verified)" ]; then
+  LOG ERROR "partition.system.verified=$(get_property partition.system.verified)"
+  die "verity not disabled after adb remount -R"
+fi
+if ${overlayfs_needed}; then
+  is_overlayfs_mounted /system ||
+    die -d "expected overlay takeover /system"
+  is_overlayfs_mounted /vendor 2>/dev/null ||
+    die -d "expected overlay takeover /vendor"
+  LOG OK "overlay takeover after adb remount -R"
+fi
+LOG OK "adb remount -R"
+
+# For devices using overlayfs, remount -R should reboot after overlayfs setup.
+# For legacy device, manual reboot to ensure device clean state.
+if ! ${overlayfs_needed}; then
+  LOG WARNING "Reboot to RO (device doesn't use overlayfs)"
+  adb_reboot ||
+    die "lost device after reboot to RO $(usb_status)"
+fi
+
+################################################################################
+# Precondition is a verity-disabled device with overlayfs already setup.
+LOG RUN "Testing adb remount RW"
 
 # Feed log with selinux denials as baseline before overlays
 adb_unroot
 adb_sh find ${MOUNTS} </dev/null >/dev/null 2>/dev/null || true
 adb_root
 
-D=`adb remount 2>&1`
-ret=${?}
-echo "${D}"
-[ ${ret} != 0 ] ||
-  [ X"${D}" = X"${D##*remount failed}" ] ||
-  ( [ -n "${L}" ] && echo "${L}" && false ) ||
-  die -t "${T}" "adb remount failed"
-D=`adb_sh df -k </dev/null` &&
-  H=`echo "${D}" | head -1` &&
-  D=`echo "${D}" | skip_unrelated_mounts | grep "^overlay "` ||
-  ( [ -n "${L}" ] && echo "${L}" && false )
-ret=${?}
-uses_dynamic_scratch=false
-scratch_partition=
-virtual_ab=`get_property ro.virtual_ab.enabled`
+adb_sh grep -qE " (/system|/) [^ ]* rw," /proc/mounts </dev/null &&
+  die "/system is not RO"
+adb_sh grep -q " /vendor [^ ]* rw," /proc/mounts </dev/null &&
+  die "/vendor is not RO"
+
+T=$(adb_date)
+adb remount >&2 ||
+  die -t "${T}" "adb remount"
+adb_sh grep -qE " (/system|/) [^ ]* rw," /proc/mounts </dev/null ||
+  die -t "${T}" "/system is not RW"
+adb_sh grep -q " /vendor [^ ]* rw," /proc/mounts </dev/null ||
+  die -t "${T}" "/vendor is not RW"
+
+scratch_on_super=false
 if ${overlayfs_needed}; then
-  if [ ${ret} != 0 ]; then
-    die -t ${T} "overlay takeover failed"
+  is_overlayfs_mounted /system ||
+    die -t "${T}" "expected overlay to takeover /system after remount"
+
+  # Collect information about the scratch device if we have one
+  M=$(adb_sh cat /proc/mounts </dev/null |
+      awk '$2 == "/mnt/scratch" { print $1, $3; exit }')
+  if [ -n "${M}" ]; then
+    scratch_device=$(echo "${M}" | awk '{ print $1 }')
+    scratch_filesystem=$(echo "${M}" | awk '{ print $2 }')
+    scratch_size=$(adb_sh df -k "${scratch_device}" </dev/null |
+                  tail +2 | head -1 | awk '{ print $2 }')
+    [ -z "${scratch_size}" ] && die "cannot get size of scratch device (${scratch_device})"
+
+    # Detect scratch partition backed by super?
+    for b in "/dev/block/by-name/super"{,_${ACTIVE_SLOT}}; do
+      if adb_test -e "${b}"; then
+        device=$(adb_su realpath "${b}")
+        D=$(adb_su stat -c '0x%t 0x%T' "${device}")
+        major=$(echo "${D}" | awk '{ print $1 }')
+        minor=$(echo "${D}" | awk '{ print $2 }')
+        super_devt=$(( major )):$(( minor ))
+        if adb_su dmctl table scratch | tail +2 | grep -q -w "${super_devt}"; then
+          scratch_on_super=true
+        fi
+        break
+      fi
+    done
+
+    if ${scratch_on_super}; then
+      LOG INFO "using dynamic scratch partition on super"
+    else
+      LOG INFO "using dynamic scratch partition on /data (VAB device)"
+    fi
+    LOG INFO "scratch device ${scratch_device} filesystem ${scratch_filesystem} size ${scratch_size}KiB"
+  else
+    LOG INFO "cannot find any scratch device mounted on /mnt/scratch, using scratch on /cache"
   fi
-  echo "${D}" | grep "^overlay .* /system\$" >/dev/null ||
-   echo "${YELLOW}[  WARNING ]${NORMAL} overlay takeover not complete" >&2
-  if [ -z "${virtual_ab}" ]; then
-    scratch_partition=scratch
-  fi
-  if echo "${D}" | grep " /mnt/scratch" >/dev/null; then
-    echo "${BLUE}[     INFO ]${NORMAL} using ${scratch_partition} dynamic partition for overrides" >&2
-  fi
-  M=`adb_sh cat /proc/mounts </dev/null |
-     sed -n 's@\([^ ]*\) /mnt/scratch \([^ ]*\) .*@\2 on \1@p'`
-  [ -n "${M}" ] &&
-    echo "${BLUE}[     INFO ]${NORMAL} scratch filesystem ${M}"
-  uses_dynamic_scratch=true
-  if [ "${M}" != "${M##*/dev/block/by-name/}" ]; then
-    uses_dynamic_scratch=false
-    scratch_partition="${M##*/dev/block/by-name/}"
-  fi
-  scratch_size=`adb_sh df -k /mnt/scratch </dev/null 2>/dev/null |
-                while read device kblocks used available use mounted on; do
-                  if [ "/mnt/scratch" = "\${mounted}" ]; then
-                    echo \${kblocks}
-                  fi
-                done` &&
-    [ -n "${scratch_size}" ] ||
-    die "scratch size"
-  echo "${BLUE}[     INFO ]${NORMAL} scratch size ${scratch_size}KB" >&2
+
   for d in ${OVERLAYFS_BACKING}; do
     if adb_test -d /${d}/overlay/system/upper; then
-      echo "${BLUE}[     INFO ]${NORMAL} /${d}/overlay is setup" >&2
+      LOG INFO "/${d}/overlay is setup"
     fi
   done
 
-  echo "${H}" &&
-    echo "${D}" &&
-    echo "${D}" | grep "^overlay .* /system\$" >/dev/null ||
-    die  "overlay takeover after remount"
-  !(adb_sh grep "^overlay " /proc/mounts </dev/null |
-    skip_unrelated_mounts |
-    grep " overlay ro,") ||
-    die "remount overlayfs missed a spot (ro)"
-  !(adb_sh grep -v noatime /proc/mounts </dev/null |
-    skip_administrative_mounts data |
-    skip_unrelated_mounts |
-    grep -v ' ro,') ||
+  data_device=$(adb_sh awk '$2 == "/data" { print $1; exit }' /proc/mounts)
+  # KISS (we do not support sub-mounts for system partitions currently)
+  adb_sh grep "^overlay " /proc/mounts </dev/null |
+    grep -vE "^overlay.* /(apex|system|vendor)/[^ ]" |
+    grep " overlay ro," &&
+    die "expected overlay to be RW after remount"
+  adb_sh grep -v noatime /proc/mounts </dev/null |
+    grep -v "^${data_device}" |
+    skip_administrative_mounts |
+    grep -v ' ro,' &&
     die "mounts are not noatime"
-  D=`adb_sh grep " rw," /proc/mounts </dev/null |
-     skip_administrative_mounts data`
-  if echo "${D}" | grep /dev/root >/dev/null; then
-    D=`echo / /
-       echo "${D}" | grep -v /dev/root`
-  fi
-  D=`echo "${D}" | cut -s -d' ' -f1 | sort -u`
-  bad_rw=false
+
+  D=$(adb_sh grep " rw," /proc/mounts </dev/null |
+      grep -v "^${data_device}" |
+      skip_administrative_mounts |
+      awk '{ print $1 }' |
+      sed 's|/dev/root|/|' |
+      sort -u)
+  if [ -n "${D}" ]; then
+    adb_sh df -k ${D} </dev/null |
+      sed -e 's/^Filesystem      /Filesystem (rw) /'
+  fi >&2
   for d in ${D}; do
-    if adb_sh tune2fs -l $d </dev/null 2>&1 |
-       grep "Filesystem features:.*shared_blocks" >/dev/null; then
-      bad_rw=true
-    else
-      d=`adb_sh df -k ${D} </dev/null |
-       sed 's@\([%] /\)\(apex\|bionic\|system\|vendor\)/[^ ][^ ]*$@\1@'`
-      [ X"${d}" = X"${d##* 100[%] }" ] ||
-        bad_rw=true
+    if adb_sh tune2fs -l "${d}" </dev/null 2>&1 | grep -q "Filesystem features:.*shared_blocks" ||
+        adb_sh df -k "${d}" | grep -q " 100% "; then
+      die "remount overlayfs missed a spot (rw)"
     fi
   done
-  [ -z "${D}" ] ||
-    D=`adb_sh df -k ${D} </dev/null |
-       sed -e 's@\([%] /\)\(apex\|bionic\|system\|vendor\)/[^ ][^ ]*$@\1@' \
-           -e 's/^Filesystem      /Filesystem (rw) /'`
-  [ -z "${D}" ] || echo "${D}"
-  ${bad_rw} && die "remount overlayfs missed a spot (rw)"
 else
-  if [ ${ret} = 0 ]; then
-    die -t ${T} "unexpected overlay takeover"
-  fi
+  is_overlayfs_mounted && die -t "${T}" "unexpected overlay takeover"
 fi
 
-# Check something.
+LOG OK "adb remount RW"
 
-echo "${GREEN}[ RUN      ]${NORMAL} push content to ${MOUNTS}" >&2
+################################################################################
+LOG RUN "push content to ${MOUNTS}"
 
+adb_root || die "adb root"
 A="Hello World! $(date)"
-for i in ${MOUNTS}; do
+for i in ${MOUNTS} /system/priv-app; do
   echo "${A}" | adb_sh cat - ">${i}/hello"
   B="`adb_cat ${i}/hello`" ||
     die "${i#/} hello"
   check_eq "${A}" "${B}" ${i} before reboot
 done
-echo "${A}" | adb_sh cat - ">/system/priv-app/hello"
-B="`adb_cat /system/priv-app/hello`" ||
-  die "system priv-app hello"
-check_eq "${A}" "${B}" /system/priv-app before reboot
-SYSTEM_DEVT=`adb_sh stat --format=%D /system/hello </dev/null`
-VENDOR_DEVT=`adb_sh stat --format=%D /vendor/hello </dev/null`
 SYSTEM_INO=`adb_sh stat --format=%i /system/hello </dev/null`
 VENDOR_INO=`adb_sh stat --format=%i /vendor/hello </dev/null`
-BASE_SYSTEM_DEVT=`adb_sh stat --format=%D /system/bin/stat </dev/null`
-BASE_VENDOR_DEVT=`adb_sh stat --format=%D /vendor/bin/stat </dev/null`
-check_eq "${SYSTEM_DEVT%[0-9a-fA-F][0-9a-fA-F]}" "${VENDOR_DEVT%[0-9a-fA-F][0-9a-fA-F]}" vendor and system devt
 check_ne "${SYSTEM_INO}" "${VENDOR_INO}" vendor and system inode
-if ${overlayfs_needed}; then
-  check_ne "${SYSTEM_DEVT}" "${BASE_SYSTEM_DEVT}" system devt
-  check_ne "${VENDOR_DEVT}" "${BASE_VENDOR_DEVT}" vendor devt
-else
-  check_eq "${SYSTEM_DEVT}" "${BASE_SYSTEM_DEVT}" system devt
-  check_eq "${VENDOR_DEVT}" "${BASE_VENDOR_DEVT}" vendor devt
-fi
-check_ne "${BASE_SYSTEM_DEVT}" "${BASE_VENDOR_DEVT}" --warning system/vendor devt
-[ -n "${SYSTEM_DEVT%[0-9a-fA-F][0-9a-fA-F]}" ] ||
-  echo "${YELLOW}[  WARNING ]${NORMAL} system devt ${SYSTEM_DEVT} major 0" >&2
-[ -n "${VENDOR_DEVT%[0-9a-fA-F][0-9a-fA-F]}" ] ||
-  echo "${YELLOW}[  WARNING ]${NORMAL} vendor devt ${VENDOR_DEVT} major 0" >&2
 
-# Download libc.so, append some garbage, push back, and check if the file
-# is updated.
-tempdir="`mktemp -d`"
-cleanup() {
-  rm -rf ${tempdir}
-}
-adb pull /system/lib/bootstrap/libc.so ${tempdir} >/dev/null ||
-  die "pull libc.so from device"
-garbage="D105225BBFCB1EB8AB8EBDB7094646F0"
-echo "${garbage}" >> ${tempdir}/libc.so
-adb push ${tempdir}/libc.so /system/lib/bootstrap/libc.so >/dev/null ||
-  die "push libc.so to device"
-adb pull /system/lib/bootstrap/libc.so ${tempdir}/libc.so.fromdevice >/dev/null ||
-  die "pull libc.so from device"
-diff ${tempdir}/libc.so ${tempdir}/libc.so.fromdevice > /dev/null ||
-  die "libc.so differ"
+# Edit build.prop and check if properties are updated.
+system_build_prop_original="${TMPDIR}/system_build.prop.original"
+system_build_prop_modified="${TMPDIR}/system_build.prop.modified"
+system_build_prop_fromdevice="${TMPDIR}/system_build.prop.fromdevice"
+adb pull /system/build.prop "${system_build_prop_original}" >/dev/null ||
+  die "adb pull /system/build.prop"
+# Prepend with extra newline in case the original file doesn't end with a newline.
+cat "${system_build_prop_original}" - <<EOF >"${system_build_prop_modified}"
 
-echo "${GREEN}[ RUN      ]${NORMAL} reboot to confirm content persistent" >&2
+# Properties added by adb remount test
+test.adb.remount.system.build.prop=true
+EOF
+adb push "${system_build_prop_modified}" /system/build.prop >/dev/null ||
+  die "adb push /system/build.prop"
+adb pull /system/build.prop "${system_build_prop_fromdevice}" >/dev/null ||
+  die "adb pull /system/build.prop"
+diff "${system_build_prop_modified}" "${system_build_prop_fromdevice}" >/dev/null ||
+  die "/system/build.prop differs from pushed content"
+
+################################################################################
+LOG RUN "reboot to confirm content persistent"
 
 fixup_from_recovery() {
   inRecovery || return 1
-  echo "${YELLOW}[    ERROR ]${NORMAL} Device in recovery" >&2
+  LOG ERROR "Device in recovery"
   adb reboot </dev/null
   adb_wait ${ADB_WAIT}
 }
 
-adb_reboot &&
-  adb_wait ${ADB_WAIT} ||
+adb_reboot ||
   fixup_from_recovery ||
   die "reboot after override content added failed `usb_status`"
 
 if ${overlayfs_needed}; then
-  D=`adb_su df -k </dev/null` &&
-    H=`echo "${D}" | head -1` &&
-    D=`echo "${D}" | grep -v " /vendor/..*$" | grep "^overlay "` ||
-    ( echo "${L}" && false ) ||
+  is_overlayfs_mounted ||
     die -d "overlay takeover failed after reboot"
 
   adb_su sed -n '1,/overlay \/system/p' /proc/mounts </dev/null |
     skip_administrative_mounts |
     grep -v ' \(erofs\|squashfs\|ext4\|f2fs\|vfat\) ' &&
-    echo "${YELLOW}[  WARNING ]${NORMAL} overlay takeover after first stage init" >&2 ||
-    echo "${GREEN}[       OK ]${NORMAL} overlay takeover in first stage init" >&2
+    LOG WARNING "overlay takeover after first stage init" ||
+    LOG OK "overlay takeover in first stage init"
 fi
 
 if ${enforcing}; then
@@ -1390,235 +1385,182 @@
     die "device not in unroot'd state"
   B="`adb_cat /vendor/hello 2>&1`"
   check_eq "cat: /vendor/hello: Permission denied" "${B}" vendor after reboot w/o root
-  echo "${GREEN}[       OK ]${NORMAL} /vendor content correct MAC after reboot" >&2
+  LOG OK "/vendor content correct MAC after reboot"
   # Feed unprivileged log with selinux denials as a result of overlays
   wait_for_screen
   adb_sh find ${MOUNTS} </dev/null >/dev/null 2>/dev/null || true
 fi
 # If overlayfs has a nested security problem, this will fail.
-B="`adb_ls /system/`" ||
-  die "adb ls /system"
-[ X"${B}" != X"${B#*priv-app}" ] ||
-  die "adb ls /system/priv-app"
+adb_sh ls /system >/dev/null || die "ls /system"
+adb_test -d /system/priv-app || die "[ -d /system/priv-app ]"
 B="`adb_cat /system/priv-app/hello`"
 check_eq "${A}" "${B}" /system/priv-app after reboot
+
 # Only root can read vendor if sepolicy permissions are as expected.
-adb_root ||
-  die "adb root"
+adb_root || die "adb root"
 for i in ${MOUNTS}; do
   B="`adb_cat ${i}/hello`"
   check_eq "${A}" "${B}" ${i#/} after reboot
-  echo "${GREEN}[       OK ]${NORMAL} ${i} content remains after reboot" >&2
+  LOG OK "${i} content remains after reboot"
 done
 
-check_eq "${SYSTEM_DEVT}" "`adb_sh stat --format=%D /system/hello </dev/null`" system devt after reboot
-check_eq "${VENDOR_DEVT}" "`adb_sh stat --format=%D /vendor/hello </dev/null`" vendor devt after reboot
 check_eq "${SYSTEM_INO}" "`adb_sh stat --format=%i /system/hello </dev/null`" system inode after reboot
 check_eq "${VENDOR_INO}" "`adb_sh stat --format=%i /vendor/hello </dev/null`" vendor inode after reboot
-check_eq "${BASE_SYSTEM_DEVT}" "`adb_sh stat --format=%D /system/bin/stat </dev/null`" --warning base system devt after reboot
-check_eq "${BASE_VENDOR_DEVT}" "`adb_sh stat --format=%D /vendor/bin/stat </dev/null`" --warning base vendor devt after reboot
-check_eq "${BASE_SYSTEM_DEVT}" "`adb_sh stat --format=%D /system/xbin/su </dev/null`" --warning devt for su after reboot
 
 # Feed log with selinux denials as a result of overlays
 adb_sh find ${MOUNTS} </dev/null >/dev/null 2>/dev/null || true
 
-# Check if the updated libc.so is persistent after reboot.
-adb_root &&
-  adb pull /system/lib/bootstrap/libc.so ${tempdir}/libc.so.fromdevice >/dev/null ||
-  die "pull libc.so from device"
-diff ${tempdir}/libc.so ${tempdir}/libc.so.fromdevice > /dev/null || die "libc.so differ"
-rm -rf ${tempdir}
-cleanup() {
-  true
-}
-echo "${GREEN}[       OK ]${NORMAL} /system/lib/bootstrap/libc.so content remains after reboot" >&2
+# Check if the updated build.prop is persistent after reboot.
+check_eq "true" "$(get_property 'test.adb.remount.system.build.prop')" "load modified build.prop"
+adb pull /system/build.prop "${system_build_prop_fromdevice}" >/dev/null ||
+  die "adb pull /system/build.prop"
+diff "${system_build_prop_modified}" "${system_build_prop_fromdevice}" >/dev/null ||
+  die "/system/build.prop differs from pushed content"
+LOG OK "/system/build.prop content remains after reboot"
 
-echo "${GREEN}[ RUN      ]${NORMAL} flash vendor, confirm its content disappears" >&2
+################################################################################
+LOG RUN "flash vendor, and confirm vendor override disappears"
 
-H=`adb_sh echo '${HOSTNAME}' </dev/null 2>/dev/null`
-is_bootloader_fastboot=false
-# cuttlefish?
-[ X"${H}" != X"${H#vsoc}" ] || is_bootloader_fastboot=true
+is_bootloader_fastboot=true
+# virtual device?
+case "$(get_property ro.product.vendor.device)" in
+  vsoc_* | emulator_* | emulator64_*)
+    is_bootloader_fastboot=false
+    ;;
+esac
 is_userspace_fastboot=false
 
 if ! ${is_bootloader_fastboot}; then
-  echo "${YELLOW}[  WARNING ]${NORMAL} does not support fastboot, skipping"
-elif [ -z "${ANDROID_PRODUCT_OUT}" ]; then
-  echo "${YELLOW}[  WARNING ]${NORMAL} build tree not setup, skipping"
-elif [ ! -s "${ANDROID_PRODUCT_OUT}/vendor.img" ]; then
-  echo "${YELLOW}[  WARNING ]${NORMAL} vendor image missing, skipping"
-elif [ "${ANDROID_PRODUCT_OUT}" = "${ANDROID_PRODUCT_OUT%*/${H}}" ]; then
-  echo "${YELLOW}[  WARNING ]${NORMAL} wrong vendor image, skipping"
-elif [ -z "${ANDROID_HOST_OUT}" ]; then
-  echo "${YELLOW}[  WARNING ]${NORMAL} please run lunch, skipping"
-elif ! (
-          adb_cat /vendor/build.prop |
-          cmp -s ${ANDROID_PRODUCT_OUT}/vendor/build.prop
-       ) >/dev/null 2>/dev/null; then
-  echo "${YELLOW}[  WARNING ]${NORMAL} vendor image signature mismatch, skipping"
+  LOG WARNING "does not support fastboot flash, skipping"
 else
   wait_for_screen
+  adb_root || die "adb root"
+
+  VENDOR_DEVICE_CANDIDATES=(
+    "/dev/block/mapper/vendor"{_${ACTIVE_SLOT},}
+    "/dev/block/by-name/vendor"{_${ACTIVE_SLOT},}
+  )
+  for b in "${VENDOR_DEVICE_CANDIDATES[@]}"; do
+    if adb_test -e "${b}"; then
+      adb pull "${b}" "${TMPDIR}/vendor.img" || die "adb pull ${b}"
+      LOG INFO "pulled ${b} from device as vendor.img"
+      break
+    fi
+  done
+  [ -f "${TMPDIR}/vendor.img" ] ||
+    die "cannot find block device of vendor partition"
+
   avc_check
   adb reboot fastboot </dev/null ||
     die "fastbootd not supported (wrong adb in path?)"
   any_wait ${ADB_WAIT} &&
     inFastboot ||
     die "reboot into fastboot to flash vendor `usb_status` (bad bootloader?)"
-  fastboot flash vendor ||
+  fastboot flash vendor "${TMPDIR}/vendor.img" ||
     ( fastboot reboot && false) ||
     die "fastboot flash vendor"
+  LOG OK "flashed vendor"
+
   fastboot_getvar is-userspace yes &&
     is_userspace_fastboot=true
-  if [ -n "${scratch_paritition}" ]; then
-    fastboot_getvar partition-type:${scratch_partition} raw ||
-      ( fastboot reboot && false) ||
-      die "fastboot can not see ${scratch_partition} parameters"
-    if ${uses_dynamic_scratch}; then
-      # check ${scratch_partition} via fastboot
-      fastboot_getvar has-slot:${scratch_partition} no &&
-        fastboot_getvar is-logical:${scratch_partition} yes ||
-        ( fastboot reboot && false) ||
-        die "fastboot can not see ${scratch_partition} parameters"
-    else
-      fastboot_getvar is-logical:${scratch_partition} no ||
-        ( fastboot reboot && false) ||
-        die "fastboot can not see ${scratch_partition} parameters"
-    fi
-    if ! ${uses_dynamic_scratch}; then
-      fastboot reboot-bootloader ||
-        die "Reboot into fastboot"
-    fi
-    if ${uses_dynamic_scratch}; then
-      echo "${BLUE}[     INFO ]${NORMAL} expect fastboot erase ${scratch_partition} to fail" >&2
-      fastboot erase ${scratch_partition} &&
-        ( fastboot reboot || true) &&
-        die "fastboot can erase ${scratch_partition}"
-    fi
-    echo "${BLUE}[     INFO ]${NORMAL} expect fastboot format ${scratch_partition} to fail" >&2
-    fastboot format ${scratch_partition} &&
-      ( fastboot reboot || true) &&
-      die "fastboot can format ${scratch_partition}"
+
+  if ${scratch_on_super}; then
+    fastboot_getvar partition-type:scratch raw ||
+      die "fastboot cannot see parameter partition-type:scratch"
+    fastboot_getvar has-slot:scratch no ||
+      die "fastboot cannot see parameter has-slot:scratch"
+    fastboot_getvar is-logical:scratch yes ||
+      die "fastboot cannot see parameter is-logical:scratch"
+    LOG INFO "expect fastboot erase scratch to fail"
+    fastboot erase scratch && die "fastboot can erase scratch"
+    LOG INFO "expect fastboot format scratch to fail"
+    fastboot format scratch && die "fastboot can format scratch"
   fi
-  fastboot reboot ||
-    die "can not reboot out of fastboot"
-  echo "${YELLOW}[  WARNING ]${NORMAL} adb after fastboot"
+
+  fastboot reboot || die "cannot reboot out of fastboot"
+  LOG INFO "reboot from fastboot"
   adb_wait ${ADB_WAIT} ||
     fixup_from_recovery ||
-    die "did not reboot after formatting ${scratch_partition} `usb_status`"
+    die "cannot reboot after flash vendor $(usb_status)"
   if ${overlayfs_needed}; then
-    adb_root &&
-      D=`adb_sh df -k </dev/null` &&
-      H=`echo "${D}" | head -1` &&
-      D=`echo "${D}" | skip_unrelated_mounts | grep "^overlay "` &&
-      echo "${H}" &&
-      echo "${D}" &&
-      echo "${D}" | grep "^overlay .* /system\$" >/dev/null ||
+    is_overlayfs_mounted /system ||
       die  "overlay /system takeover after flash vendor"
-    echo "${D}" | grep "^overlay .* /vendor\$" >/dev/null &&
+    if is_overlayfs_mounted /vendor 2>/dev/null; then
       if ${is_userspace_fastboot}; then
         die  "overlay supposed to be minus /vendor takeover after flash vendor"
       else
-        echo "${YELLOW}[  WARNING ]${NORMAL} user fastboot missing required to invalidate, ignoring a failure" >&2
-        echo "${YELLOW}[  WARNING ]${NORMAL} overlay supposed to be minus /vendor takeover after flash vendor" >&2
+        LOG WARNING "fastbootd missing required to invalidate, ignoring a failure"
+        LOG WARNING "overlay supposed to be minus /vendor takeover after flash vendor"
       fi
+    fi
   fi
-  B="`adb_cat /system/hello`"
-  check_eq "${A}" "${B}" system after flash vendor
-  B="`adb_ls /system/`" ||
-    die "adb ls /system"
-  [ X"${B}" != X"${B#*priv-app}" ] ||
-    die "adb ls /system/priv-app"
-  B="`adb_cat /system/priv-app/hello`"
-  check_eq "${A}" "${B}" system/priv-app after flash vendor
-  adb_root ||
-    die "adb root"
-  B="`adb_cat /vendor/hello`"
-  if ${is_userspace_fastboot} || ! ${overlayfs_needed}; then
-    check_eq "cat: /vendor/hello: No such file or directory" "${B}" \
-             vendor content after flash vendor
-  else
-    echo "${YELLOW}[  WARNING ]${NORMAL} user fastboot missing required to invalidate, ignoring a failure" >&2
-    check_eq "cat: /vendor/hello: No such file or directory" "${B}" \
-             --warning vendor content after flash vendor
+  check_eq "${A}" "$(adb_cat /system/hello)" "/system content after flash vendor"
+  check_eq "${SYSTEM_INO}" "$(adb_sh stat --format=%i /system/hello </dev/null)" "system inode after flash vendor"
+  adb_sh ls /system >/dev/null || die "ls /system"
+  adb_test -d /system/priv-app || die "[ -d /system/priv-app ]"
+  check_eq "${A}" "$(adb_cat /system/priv-app/hello)" "/system/priv-app content after flash vendor"
+  adb_root || die "adb root"
+  if adb_test -e /vendor/hello; then
+    if ${is_userspace_fastboot} || ! ${overlayfs_needed}; then
+      die "vendor content after flash vendor"
+    else
+      LOG WARNING "fastbootd missing required to invalidate, ignoring a failure"
+      LOG WARNING "vendor content after flash vendor"
+    fi
   fi
-
-  check_eq "${SYSTEM_DEVT}" "`adb_sh stat --format=%D /system/hello </dev/null`" system devt after reboot
-  check_eq "${SYSTEM_INO}" "`adb_sh stat --format=%i /system/hello </dev/null`" system inode after reboot
-  check_eq "${BASE_SYSTEM_DEVT}" "`adb_sh stat --format=%D /system/bin/stat </dev/null`" --warning base system devt after reboot
-  check_eq "${BASE_SYSTEM_DEVT}" "`adb_sh stat --format=%D /system/xbin/su </dev/null`" --warning devt for su after reboot
-
-fi
+  LOG OK "vendor override destroyed after flash verdor"
+fi >&2
 
 wait_for_screen
-echo "${GREEN}[ RUN      ]${NORMAL} remove test content (cleanup)" >&2
 
-T=`adb_date`
-H=`adb remount 2>&1`
-err=${?}
-L=
-D="${H%?Now reboot your device for settings to take effect*}"
-if [ X"${H}" != X"${D}" ]; then
-  echo "${YELLOW}[  WARNING ]${NORMAL} adb remount requires a reboot after partial flash (legacy avb)"
-  L=`adb_logcat -b all -v nsec -t ${T} 2>&1`
-  adb_reboot &&
-    adb_wait ${ADB_WAIT} &&
-    adb_root ||
-    die "failed to reboot"
-  T=`adb_date`
-  H=`adb remount 2>&1`
-  err=${?}
+################################################################################
+LOG RUN "Clean up test content"
+
+adb_root || die "adb root"
+T=$(adb_date)
+D=$(adb remount 2>&1) ||
+  die -t "${T}" "adb remount"
+echo "${D}" >&2
+if [[ "${D}" =~ [Rr]eboot ]]; then
+  LOG OK "adb remount calls for a reboot after partial flash"
+  # but we don't really want to, since rebooting just recreates the already tore
+  # down vendor overlay.
 fi
-echo "${H}"
-[ ${err} = 0 ] &&
-  ( adb_sh rm /vendor/hello </dev/null 2>/dev/null || true ) &&
-  adb_sh rm /system/hello /system/priv-app/hello </dev/null ||
-  ( [ -n "${L}" ] && echo "${L}" && false ) ||
-  die -t ${T} "cleanup hello"
-B="`adb_cat /system/hello`"
-check_eq "cat: /system/hello: No such file or directory" "${B}" after rm
-B="`adb_cat /system/priv-app/hello`"
-check_eq "cat: /system/priv-app/hello: No such file or directory" "${B}" after rm
-B="`adb_cat /vendor/hello`"
-check_eq "cat: /vendor/hello: No such file or directory" "${B}" after rm
-for i in ${MOUNTS}; do
-  adb_sh rm ${i}/hello </dev/null 2>/dev/null || true
+
+for i in ${MOUNTS} /system/priv-app; do
+  adb_sh rm "${i}/hello" 2>/dev/null || true
+  adb_test -e "${i}/hello" &&
+    die -t "${T}" "/${i}/hello lingers after rm"
 done
 
-if ${is_bootloader_fastboot} && [ -n "${scratch_partition}" ]; then
+################################################################################
+if ${is_bootloader_fastboot} && ${scratch_on_super}; then
 
-  echo "${GREEN}[ RUN      ]${NORMAL} test fastboot flash to ${scratch_partition} recovery" >&2
+  LOG RUN "test fastboot flash to scratch recovery"
 
   avc_check
   adb reboot fastboot </dev/null ||
     die "Reboot into fastbootd"
-  img=${TMPDIR}/adb-remount-test-${$}.img
-  cleanup() {
-    rm ${img}
-  }
+  img="${TMPDIR}/adb-remount-test-${$}.img"
   dd if=/dev/zero of=${img} bs=4096 count=16 2>/dev/null &&
     fastboot_wait ${FASTBOOT_WAIT} ||
     die "reboot into fastboot to flash scratch `usb_status`"
-  fastboot flash --force ${scratch_partition} ${img}
+  fastboot flash --force scratch ${img}
   err=${?}
-  cleanup
-  cleanup() {
-    true
-  }
   fastboot reboot ||
     die "can not reboot out of fastboot"
   [ 0 -eq ${err} ] ||
-    die "fastboot flash ${scratch_partition}"
+    die "fastboot flash scratch"
   adb_wait ${ADB_WAIT} &&
     adb_root ||
-    die "did not reboot after flashing empty ${scratch_partition} `usb_status`"
+    die "did not reboot after flashing empty scratch $(usb_status)"
   T=`adb_date`
   D=`adb disable-verity 2>&1`
   err=${?}
   if [ X"${D}" != "${D%?Now reboot your device for settings to take effect*}" ]
   then
-    echo "${YELLOW}[  WARNING ]${NORMAL} adb disable-verity requires a reboot after partial flash"
+    LOG WARNING "adb disable-verity requires a reboot after partial flash"
     adb_reboot &&
-      adb_wait ${ADB_WAIT} &&
       adb_root ||
       die "failed to reboot"
     T=`adb_date`
@@ -1627,135 +1569,15 @@
     err=${?}
   fi
 
-  echo "${D}"
+  echo "${D}" >&2
   [ ${err} = 0 ] &&
     [ X"${D}" = X"${D##*setup failed}" ] &&
     [ X"${D}" != X"${D##*[Uu]sing overlayfs}" ] &&
-    echo "${GREEN}[       OK ]${NORMAL} ${scratch_partition} recreated" >&2 ||
+    LOG OK "recreated scratch" ||
     die -t ${T} "setup for overlayfs"
-  D=`adb remount 2>&1`
-  err=${?}
-  echo "${D}"
-  [ ${err} != 0 ] ||
-    [ X"${D}" = X"${D##*remount failed}" ] ||
-    ( echo "${D}" && false ) ||
+  adb remount >&2 ||
     die -t ${T} "remount failed"
 fi
 
-echo "${GREEN}[ RUN      ]${NORMAL} test raw remount commands" >&2
 
-fixup_from_fastboot() {
-  inFastboot || return 1
-  if [ -n "${ACTIVE_SLOT}" ]; then
-    local active_slot=`get_active_slot`
-    if [ X"${ACTIVE_SLOT}" != X"${active_slot}" ]; then
-      echo "${YELLOW}[    ERROR ]${NORMAL} Active slot changed from ${ACTIVE_SLOT} to ${active_slot}"
-    else
-      echo "${YELLOW}[    ERROR ]${NORMAL} Active slot to be set to ${ACTIVE_SLOT}"
-    fi >&2
-    fastboot --set-active=${ACTIVE_SLOT}
-  fi
-  fastboot reboot
-  adb_wait ${ADB_WAIT}
-}
-
-# Prerequisite is a prepped device from above.
-adb_reboot &&
-  adb_wait ${ADB_WAIT} ||
-  fixup_from_fastboot ||
-  die "lost device after reboot to ro state `usb_status`"
-adb_sh grep " /vendor .* rw," /proc/mounts >/dev/null </dev/null &&
-  die "/vendor is not read-only"
-adb_su mount -o rw,remount /vendor </dev/null ||
-  die "remount command"
-adb_sh grep " /vendor .* rw," /proc/mounts >/dev/null </dev/null ||
-  die "/vendor is not read-write"
-echo "${GREEN}[       OK ]${NORMAL} mount -o rw,remount command works" >&2
-
-# Prerequisite is a prepped device from above.
-adb_reboot &&
-  adb_wait ${ADB_WAIT} ||
-  fixup_from_fastboot ||
-  die "lost device after reboot to ro state `usb_status`"
-adb_sh grep " /vendor .* rw," /proc/mounts >/dev/null </dev/null &&
-  die "/vendor is not read-only"
-adb_su remount vendor </dev/null ||
-  die "remount command"
-adb_sh grep " /vendor .* rw," /proc/mounts >/dev/null </dev/null ||
-  die "/vendor is not read-write"
-adb_sh grep " /system .* rw," /proc/mounts >/dev/null </dev/null &&
-  die "/vendor is not read-only"
-echo "${GREEN}[       OK ]${NORMAL} remount command works from setup" >&2
-
-# Prerequisite is an overlayfs deconstructed device but with verity disabled.
-# This also saves a lot of 'noise' from the command doing a mkfs on backing
-# storage and all the related tuning and adjustment.
-for d in ${OVERLAYFS_BACKING}; do
-  if adb_test -d /${d}/overlay; then
-    adb_su rm -rf /${d}/overlay </dev/null ||
-      die "/${d}/overlay wipe"
-  fi
-done
-adb_reboot &&
-  adb_wait ${ADB_WAIT} ||
-  fixup_from_fastboot ||
-  die "lost device after reboot after wipe `usb_status`"
-adb_sh grep " /vendor .* rw," /proc/mounts >/dev/null </dev/null &&
-  die "/vendor is not read-only"
-adb_su remount vendor </dev/null ||
-  die "remount command"
-adb_su df -k </dev/null | skip_unrelated_mounts
-adb_sh grep " /vendor .* rw," /proc/mounts >/dev/null </dev/null ||
-  die "/vendor is not read-write"
-adb_sh grep " \(/system\|/\) .* rw," /proc/mounts >/dev/null </dev/null &&
-  die "/system is not read-only"
-echo "${GREEN}[       OK ]${NORMAL} remount command works from scratch" >&2
-
-if ! restore; then
-  restore() {
-    true
-  }
-  die "failed to restore verity after remount from scratch test"
-fi
-
-err=0
-
-if ${overlayfs_supported}; then
-  echo "${GREEN}[ RUN      ]${NORMAL} test 'adb remount -R'" >&2
-  avc_check
-  adb_root ||
-    die "adb root in preparation for adb remount -R"
-  T=`adb_date`
-  adb remount -R
-  err=${?}
-  if [ "${err}" != 0 ]; then
-    die -t ${T} "adb remount -R = ${err}"
-  fi
-  sleep 2
-  adb_wait ${ADB_WAIT} ||
-    die "waiting for device after adb remount -R `usb_status`"
-  if [ "orange" != "`get_property ro.boot.verifiedbootstate`" -o \
-       "2" = "`get_property partition.system.verified`" ] &&
-     [ -n "`get_property ro.boot.verifiedbootstate`" -o \
-       -n "`get_property partition.system.verified`" ]; then
-    die "remount -R command failed to disable verity
-${INDENT}ro.boot.verifiedbootstate=\"`get_property ro.boot.verifiedbootstate`\"
-${INDENT}partition.system.verified=\"`get_property partition.system.verified`\""
-  fi
-
-  echo "${GREEN}[       OK ]${NORMAL} 'adb remount -R' command" >&2
-
-  restore
-  err=${?}
-fi
-
-restore() {
-  true
-}
-
-[ ${err} = 0 ] ||
-  die "failed to restore verity"
-
-echo "${GREEN}[  PASSED  ]${NORMAL} adb remount" >&2
-
-test_duration
+LOG PASSED "adb remount test"
diff --git a/fs_mgr/tests/fs_mgr_test.cpp b/fs_mgr/tests/fs_mgr_test.cpp
index 6c881c0..e33681c 100644
--- a/fs_mgr/tests/fs_mgr_test.cpp
+++ b/fs_mgr/tests/fs_mgr_test.cpp
@@ -1109,14 +1109,17 @@
     TemporaryFile tf;
     ASSERT_TRUE(tf.fd != -1);
     std::string fstab_contents = R"fs(
+data   /data        f2fs    noatime     wait,latemount
 system /system      erofs   ro  wait,logical,first_stage_mount
 system /system      ext4    ro  wait,logical,first_stage_mount
 vendor /vendor      ext4    ro  wait,logical,first_stage_mount
-data   /data        f2fs    noatime     wait
 )fs";
 
     ASSERT_TRUE(android::base::WriteStringToFile(fstab_contents, tf.path));
 
+    // If GSI is installed, ReadFstabFromFile() would have called TransformFstabForDsu() implicitly.
+    // In other words, TransformFstabForDsu() would be called two times if running CTS-on-GSI,
+    // which implies TransformFstabForDsu() should be idempotent.
     Fstab fstab;
     EXPECT_TRUE(ReadFstabFromFile(tf.path, &fstab));
     TransformFstabForDsu(&fstab, "dsu", {"system_gsi", "userdata_gsi"});
@@ -1124,21 +1127,23 @@
 
     auto entry = fstab.begin();
 
-    EXPECT_EQ("/system", entry->mount_point);
-    EXPECT_EQ("system_gsi", entry->blk_device);
+    EXPECT_EQ("/data", entry->mount_point);
+    EXPECT_EQ("userdata_gsi", entry->blk_device);
     entry++;
 
     EXPECT_EQ("/system", entry->mount_point);
     EXPECT_EQ("system_gsi", entry->blk_device);
+    EXPECT_EQ("erofs", entry->fs_type);
+    entry++;
+
+    EXPECT_EQ("/system", entry->mount_point);
+    EXPECT_EQ("system_gsi", entry->blk_device);
+    EXPECT_EQ("ext4", entry->fs_type);
     entry++;
 
     EXPECT_EQ("/vendor", entry->mount_point);
     EXPECT_EQ("vendor", entry->blk_device);
     entry++;
-
-    EXPECT_EQ("/data", entry->mount_point);
-    EXPECT_EQ("userdata_gsi", entry->blk_device);
-    entry++;
 }
 
 TEST(fs_mgr, TransformFstabForDsu_synthesisExt4Entry) {
@@ -1147,7 +1152,7 @@
     std::string fstab_contents = R"fs(
 system /system      erofs   ro  wait,logical,first_stage_mount
 vendor /vendor      ext4    ro  wait,logical,first_stage_mount
-data   /data        f2fs    noatime     wait
+data   /data        f2fs    noatime     wait,latemount
 )fs";
 
     ASSERT_TRUE(android::base::WriteStringToFile(fstab_contents, tf.path));
@@ -1177,3 +1182,39 @@
     EXPECT_EQ("userdata_gsi", entry->blk_device);
     entry++;
 }
+
+TEST(fs_mgr, TransformFstabForDsu_synthesisAllMissingEntries) {
+    TemporaryFile tf;
+    ASSERT_TRUE(tf.fd != -1);
+    std::string fstab_contents = R"fs(
+data   /data        f2fs    noatime     wait,latemount
+vendor /vendor      ext4    ro  wait,logical,first_stage_mount
+)fs";
+
+    ASSERT_TRUE(android::base::WriteStringToFile(fstab_contents, tf.path));
+
+    Fstab fstab;
+    EXPECT_TRUE(ReadFstabFromFile(tf.path, &fstab));
+    TransformFstabForDsu(&fstab, "dsu", {"system_gsi", "userdata_gsi"});
+    ASSERT_EQ(4U, fstab.size());
+
+    auto entry = fstab.begin();
+
+    EXPECT_EQ("/data", entry->mount_point);
+    EXPECT_EQ("userdata_gsi", entry->blk_device);
+    entry++;
+
+    EXPECT_EQ("/vendor", entry->mount_point);
+    EXPECT_EQ("vendor", entry->blk_device);
+    entry++;
+
+    EXPECT_EQ("/system", entry->mount_point);
+    EXPECT_EQ("system_gsi", entry->blk_device);
+    EXPECT_EQ("ext4", entry->fs_type);
+    entry++;
+
+    EXPECT_EQ("/system", entry->mount_point);
+    EXPECT_EQ("system_gsi", entry->blk_device);
+    EXPECT_EQ("erofs", entry->fs_type);
+    entry++;
+}
diff --git a/fs_mgr/tests/vts_fs_test.cpp b/fs_mgr/tests/vts_fs_test.cpp
index ae8e459..bb2ceb9 100644
--- a/fs_mgr/tests/vts_fs_test.cpp
+++ b/fs_mgr/tests/vts_fs_test.cpp
@@ -23,6 +23,9 @@
 #include <gtest/gtest.h>
 #include <libdm/dm.h>
 
+using testing::Contains;
+using testing::Not;
+
 static int GetVsrLevel() {
     return android::base::GetIntProperty("ro.vendor.api_level", -1);
 }
@@ -63,6 +66,14 @@
 
     int vsr_level = GetVsrLevel();
 
+    std::vector<std::string> must_be_f2fs;
+    if (vsr_level >= __ANDROID_API_T__) {
+        must_be_f2fs.emplace_back("/data");
+    }
+    if (vsr_level >= __ANDROID_API_U__) {
+        must_be_f2fs.emplace_back("/metadata");
+    }
+
     for (const auto& entry : fstab) {
         std::string parent_bdev = entry.blk_device;
         while (true) {
@@ -96,15 +107,15 @@
         }
 
         if (entry.flags & MS_RDONLY) {
-            std::vector<std::string> allowed = {"erofs", "ext4"};
-            if (vsr_level == __ANDROID_API_T__) {
-                allowed.emplace_back("f2fs");
-            }
+            std::vector<std::string> allowed = {"erofs", "ext4", "f2fs"};
 
             EXPECT_NE(std::find(allowed.begin(), allowed.end(), entry.fs_type), allowed.end())
                     << entry.mount_point;
         } else {
-            EXPECT_NE(entry.fs_type, "ext4") << entry.mount_point;
+            if (std::find(must_be_f2fs.begin(), must_be_f2fs.end(), entry.mount_point) !=
+                must_be_f2fs.end()) {
+                EXPECT_EQ(entry.fs_type, "f2fs") << entry.mount_point;
+            }
         }
     }
 }
@@ -117,3 +128,30 @@
     android::fs_mgr::Fstab fstab;
     EXPECT_FALSE(android::fs_mgr::ReadFstabFromDt(&fstab, false));
 }
+
+TEST(fs, NoLegacyVerifiedBoot) {
+    if (GetVsrLevel() < __ANDROID_API_T__) {
+        GTEST_SKIP();
+    }
+
+    const auto& default_fstab_path = android::fs_mgr::GetFstabPath();
+    EXPECT_FALSE(default_fstab_path.empty());
+
+    std::string fstab_str;
+    EXPECT_TRUE(android::base::ReadFileToString(default_fstab_path, &fstab_str,
+                                                /* follow_symlinks = */ true));
+
+    for (const auto& line : android::base::Split(fstab_str, "\n")) {
+        auto fields = android::base::Tokenize(line, " \t");
+        // Ignores empty lines and comments.
+        if (fields.empty() || android::base::StartsWith(fields.front(), '#')) {
+            continue;
+        }
+        // Each line in a fstab should have at least five entries.
+        //   <src> <mnt_point> <type> <mnt_flags and options> <fs_mgr_flags>
+        ASSERT_GE(fields.size(), 5);
+        EXPECT_THAT(android::base::Split(fields[4], ","), Not(Contains("verify")))
+                << "AVB 1.0 isn't supported now, but the 'verify' flag is found:\n"
+                << "  " << line;
+    }
+}
diff --git a/fs_mgr/tools/dmctl.cpp b/fs_mgr/tools/dmctl.cpp
index 62ca162..10efd0c 100644
--- a/fs_mgr/tools/dmctl.cpp
+++ b/fs_mgr/tools/dmctl.cpp
@@ -33,6 +33,7 @@
 #include <ios>
 #include <iostream>
 #include <map>
+#include <optional>
 #include <sstream>
 #include <string>
 #include <vector>
@@ -183,6 +184,8 @@
             }
             std::string control_device = NextArg();
             return std::make_unique<DmTargetUser>(start_sector, num_sectors, control_device);
+        } else if (target_type == "error") {
+            return std::make_unique<DmTargetError>(start_sector, num_sectors);
         } else {
             std::cerr << "Unrecognized target type: " << target_type << std::endl;
             return nullptr;
@@ -206,16 +209,26 @@
     char** argv_;
 };
 
-static bool parse_table_args(DmTable* table, int argc, char** argv) {
+struct TableArgs {
+    DmTable table;
+    bool suspended = false;
+};
+
+static std::optional<TableArgs> parse_table_args(int argc, char** argv) {
+    TableArgs out;
+
     // Parse extended options first.
     int arg_index = 1;
     while (arg_index < argc && argv[arg_index][0] == '-') {
         if (strcmp(argv[arg_index], "-ro") == 0) {
-            table->set_readonly(true);
+            out.table.set_readonly(true);
+            arg_index++;
+        } else if (strcmp(argv[arg_index], "-suspended") == 0) {
+            out.suspended = true;
             arg_index++;
         } else {
             std::cerr << "Unrecognized option: " << argv[arg_index] << std::endl;
-            return -EINVAL;
+            return {};
         }
     }
 
@@ -223,37 +236,44 @@
     TargetParser parser(argc - arg_index, argv + arg_index);
     while (parser.More()) {
         std::unique_ptr<DmTarget> target = parser.Next();
-        if (!target || !table->AddTarget(std::move(target))) {
-            return -EINVAL;
+        if (!target || !out.table.AddTarget(std::move(target))) {
+            return {};
         }
     }
 
-    if (table->num_targets() == 0) {
+    if (out.table.num_targets() == 0) {
         std::cerr << "Must define at least one target." << std::endl;
-        return -EINVAL;
+        return {};
     }
-    return 0;
+    return {std::move(out)};
 }
 
 static int DmCreateCmdHandler(int argc, char** argv) {
     if (argc < 1) {
-        std::cerr << "Usage: dmctl create <dm-name> [-ro] <targets...>" << std::endl;
+        std::cerr << "Usage: dmctl create <dm-name> [--suspended] [-ro] <targets...>" << std::endl;
         return -EINVAL;
     }
     std::string name = argv[0];
 
-    DmTable table;
-    int ret = parse_table_args(&table, argc, argv);
-    if (ret) {
-        return ret;
+    auto table_args = parse_table_args(argc, argv);
+    if (!table_args) {
+        return -EINVAL;
     }
 
     std::string ignore_path;
     DeviceMapper& dm = DeviceMapper::Instance();
-    if (!dm.CreateDevice(name, table, &ignore_path, 5s)) {
+    if (!dm.CreateEmptyDevice(name)) {
         std::cerr << "Failed to create device-mapper device with name: " << name << std::endl;
         return -EIO;
     }
+    if (!dm.LoadTable(name, table_args->table)) {
+        std::cerr << "Failed to load table for dm device: " << name << std::endl;
+        return -EIO;
+    }
+    if (!table_args->suspended && !dm.ChangeState(name, DmDeviceState::ACTIVE)) {
+        std::cerr << "Failed to activate table for " << name << std::endl;
+        return -EIO;
+    }
     return 0;
 }
 
@@ -269,7 +289,6 @@
         std::cerr << "Failed to delete [" << name << "]" << std::endl;
         return -EIO;
     }
-
     return 0;
 }
 
@@ -280,17 +299,20 @@
     }
     std::string name = argv[0];
 
-    DmTable table;
-    int ret = parse_table_args(&table, argc, argv);
-    if (ret) {
-        return ret;
+    auto table_args = parse_table_args(argc, argv);
+    if (!table_args) {
+        return -EINVAL;
     }
 
     DeviceMapper& dm = DeviceMapper::Instance();
-    if (!dm.LoadTableAndActivate(name, table)) {
+    if (!dm.LoadTable(name, table_args->table)) {
         std::cerr << "Failed to replace device-mapper table to: " << name << std::endl;
         return -EIO;
     }
+    if (!table_args->suspended && !dm.ChangeState(name, DmDeviceState::ACTIVE)) {
+        std::cerr << "Failed to activate table for " << name << std::endl;
+        return -EIO;
+    }
     return 0;
 }
 
diff --git a/fs_mgr/tools/dmuserd.cpp b/fs_mgr/tools/dmuserd.cpp
index 6b68b28..da7156c 100644
--- a/fs_mgr/tools/dmuserd.cpp
+++ b/fs_mgr/tools/dmuserd.cpp
@@ -13,6 +13,7 @@
 #include <sys/prctl.h>
 #include <unistd.h>
 #include <iostream>
+#include <string>
 
 #define SECTOR_SIZE ((__u64)512)
 #define BUFFER_BYTES 4096
@@ -133,16 +134,16 @@
     return 0;
 }
 
-int simple_daemon(char* control_path, char* backing_path) {
-    int control_fd = open(control_path, O_RDWR);
+static int simple_daemon(const std::string& control_path, const std::string& backing_path) {
+    int control_fd = open(control_path.c_str(), O_RDWR);
     if (control_fd < 0) {
-        fprintf(stderr, "Unable to open control device %s\n", control_path);
+        fprintf(stderr, "Unable to open control device %s\n", control_path.c_str());
         return -1;
     }
 
-    int backing_fd = open(backing_path, O_RDWR);
+    int backing_fd = open(backing_path.c_str(), O_RDWR);
     if (backing_fd < 0) {
-        fprintf(stderr, "Unable to open backing device %s\n", backing_path);
+        fprintf(stderr, "Unable to open backing device %s\n", backing_path.c_str());
         return -1;
     }
 
@@ -286,8 +287,8 @@
 }
 
 int main(int argc, char* argv[]) {
-    char* control_path = NULL;
-    char* backing_path = NULL;
+    std::string control_path;
+    std::string backing_path;
     char* store;
     int c;
 
@@ -299,10 +300,10 @@
                 usage(basename(argv[0]));
                 exit(0);
             case 'c':
-                control_path = strdup(optarg);
+                control_path = optarg;
                 break;
             case 'b':
-                backing_path = strdup(optarg);
+                backing_path = optarg;
                 break;
             case 'v':
                 verbose = true;
diff --git a/gatekeeperd/Android.bp b/gatekeeperd/Android.bp
index 0aedc58..838f734 100644
--- a/gatekeeperd/Android.bp
+++ b/gatekeeperd/Android.bp
@@ -43,6 +43,8 @@
         "libutils",
         "libcrypto",
         "libhidlbase",
+        "lib_android_keymaster_keymint_utils",
+        "android.hardware.gatekeeper-V1-ndk",
         "android.hardware.gatekeeper@1.0",
         "libgatekeeper_aidl",
         "android.security.authorization-ndk",
diff --git a/gatekeeperd/gatekeeperd.cpp b/gatekeeperd/gatekeeperd.cpp
index 8792c83..76fcd55 100644
--- a/gatekeeperd/gatekeeperd.cpp
+++ b/gatekeeperd/gatekeeperd.cpp
@@ -25,6 +25,7 @@
 #include <unistd.h>
 #include <memory>
 
+#include <KeyMintUtils.h>
 #include <android-base/logging.h>
 #include <android-base/properties.h>
 #include <android/binder_ibinder.h>
@@ -38,6 +39,7 @@
 #include <log/log.h>
 #include <utils/String16.h>
 
+#include <aidl/android/hardware/gatekeeper/IGatekeeper.h>
 #include <aidl/android/hardware/security/keymint/HardwareAuthToken.h>
 #include <aidl/android/security/authorization/IKeystoreAuthorization.h>
 #include <android/hardware/gatekeeper/1.0/IGatekeeper.h>
@@ -49,27 +51,35 @@
 using android::hardware::gatekeeper::V1_0::GatekeeperStatusCode;
 using android::hardware::gatekeeper::V1_0::IGatekeeper;
 
+using AidlGatekeeperEnrollResp = aidl::android::hardware::gatekeeper::GatekeeperEnrollResponse;
+using AidlGatekeeperVerifyResp = aidl::android::hardware::gatekeeper::GatekeeperVerifyResponse;
+using AidlIGatekeeper = aidl::android::hardware::gatekeeper::IGatekeeper;
+
 using ::android::binder::Status;
 using ::android::service::gatekeeper::BnGateKeeperService;
 using GKResponse = ::android::service::gatekeeper::GateKeeperResponse;
 using GKResponseCode = ::android::service::gatekeeper::ResponseCode;
 using ::aidl::android::hardware::security::keymint::HardwareAuthenticatorType;
 using ::aidl::android::hardware::security::keymint::HardwareAuthToken;
+using ::aidl::android::hardware::security::keymint::km_utils::authToken2AidlVec;
 using ::aidl::android::security::authorization::IKeystoreAuthorization;
 
 namespace android {
 
 static const String16 KEYGUARD_PERMISSION("android.permission.ACCESS_KEYGUARD_SECURE_STORAGE");
 static const String16 DUMP_PERMISSION("android.permission.DUMP");
+constexpr const char gatekeeperServiceName[] = "android.hardware.gatekeeper.IGatekeeper/default";
 
 class GateKeeperProxy : public BnGateKeeperService {
   public:
     GateKeeperProxy() {
         clear_state_if_needed_done = false;
         hw_device = IGatekeeper::getService();
+        ::ndk::SpAIBinder ks2Binder(AServiceManager_getService(gatekeeperServiceName));
+        aidl_hw_device = AidlIGatekeeper::fromBinder(ks2Binder);
         is_running_gsi = android::base::GetBoolProperty(android::gsi::kGsiBootedProp, false);
 
-        if (!hw_device) {
+        if (!aidl_hw_device && !hw_device) {
             LOG(ERROR) << "Could not find Gatekeeper device, which makes me very sad.";
         }
     }
@@ -95,7 +105,9 @@
 
         if (mark_cold_boot() && !is_running_gsi) {
             ALOGI("cold boot: clearing state");
-            if (hw_device) {
+            if (aidl_hw_device) {
+                aidl_hw_device->deleteAllUsers();
+            } else if (hw_device) {
                 hw_device->deleteAllUsers([](const GatekeeperResponse&) {});
             }
         }
@@ -150,7 +162,7 @@
     uint32_t adjust_userId(uint32_t userId) {
         static constexpr uint32_t kGsiOffset = 1000000;
         CHECK(userId < kGsiOffset);
-        CHECK(hw_device != nullptr);
+        CHECK((aidl_hw_device != nullptr) || (hw_device != nullptr));
         if (is_running_gsi) {
             return userId + kGsiOffset;
         }
@@ -176,7 +188,7 @@
         // need a desired password to enroll
         if (desiredPassword.size() == 0) return GK_ERROR;
 
-        if (!hw_device) {
+        if (!aidl_hw_device && !hw_device) {
             LOG(ERROR) << "has no HAL to talk to";
             return GK_ERROR;
         }
@@ -185,9 +197,13 @@
         android::hardware::hidl_vec<uint8_t> curPwd;
 
         if (currentPasswordHandle && currentPassword) {
-            if (currentPasswordHandle->size() != sizeof(gatekeeper::password_handle_t)) {
-                LOG(INFO) << "Password handle has wrong length";
-                return GK_ERROR;
+            if (hw_device) {
+                // Hidl Implementations expects passwordHandle to be in
+                // gatekeeper::password_handle_t format.
+                if (currentPasswordHandle->size() != sizeof(gatekeeper::password_handle_t)) {
+                    LOG(INFO) << "Password handle has wrong length";
+                    return GK_ERROR;
+                }
             }
             curPwdHandle.setToExternal(const_cast<uint8_t*>(currentPasswordHandle->data()),
                                        currentPasswordHandle->size());
@@ -199,7 +215,27 @@
         newPwd.setToExternal(const_cast<uint8_t*>(desiredPassword.data()), desiredPassword.size());
 
         uint32_t hw_userId = adjust_userId(userId);
-        Return<void> hwRes = hw_device->enroll(
+        uint64_t secureUserId = 0;
+        if (aidl_hw_device) {
+            // AIDL gatekeeper service
+            AidlGatekeeperEnrollResp rsp;
+            auto result = aidl_hw_device->enroll(hw_userId, curPwdHandle, curPwd, newPwd, &rsp);
+            if (!result.isOk()) {
+                LOG(ERROR) << "enroll transaction failed";
+                return GK_ERROR;
+            }
+            if (rsp.statusCode >= AidlIGatekeeper::STATUS_OK) {
+                *gkResponse = GKResponse::ok({rsp.data.begin(), rsp.data.end()});
+                secureUserId = static_cast<uint64_t>(rsp.secureUserId);
+            } else if (rsp.statusCode == AidlIGatekeeper::ERROR_RETRY_TIMEOUT &&
+                       rsp.timeoutMs > 0) {
+                *gkResponse = GKResponse::retry(rsp.timeoutMs);
+            } else {
+                *gkResponse = GKResponse::error();
+            }
+        } else if (hw_device) {
+            // HIDL gatekeeper service
+            Return<void> hwRes = hw_device->enroll(
                 hw_userId, curPwdHandle, curPwd, newPwd,
                 [&gkResponse](const GatekeeperResponse& rsp) {
                     if (rsp.code >= GatekeeperStatusCode::STATUS_OK) {
@@ -211,22 +247,26 @@
                         *gkResponse = GKResponse::error();
                     }
                 });
-        if (!hwRes.isOk()) {
-            LOG(ERROR) << "enroll transaction failed";
-            return GK_ERROR;
+            if (!hwRes.isOk()) {
+                LOG(ERROR) << "enroll transaction failed";
+                return GK_ERROR;
+            }
+            if (gkResponse->response_code() == GKResponseCode::OK) {
+                if (gkResponse->payload().size() != sizeof(gatekeeper::password_handle_t)) {
+                    LOG(ERROR) << "HAL returned password handle of invalid length "
+                               << gkResponse->payload().size();
+                    return GK_ERROR;
+                }
+
+                const gatekeeper::password_handle_t* handle =
+                    reinterpret_cast<const gatekeeper::password_handle_t*>(
+                        gkResponse->payload().data());
+                secureUserId = handle->user_id;
+            }
         }
 
         if (gkResponse->response_code() == GKResponseCode::OK && !gkResponse->should_reenroll()) {
-            if (gkResponse->payload().size() != sizeof(gatekeeper::password_handle_t)) {
-                LOG(ERROR) << "HAL returned password handle of invalid length "
-                           << gkResponse->payload().size();
-                return GK_ERROR;
-            }
-
-            const gatekeeper::password_handle_t* handle =
-                    reinterpret_cast<const gatekeeper::password_handle_t*>(
-                            gkResponse->payload().data());
-            store_sid(userId, handle->user_id);
+            store_sid(userId, secureUserId);
 
             GKResponse verifyResponse;
             // immediately verify this password so we don't ask the user to enter it again
@@ -260,15 +300,18 @@
         // can't verify if we're missing either param
         if (enrolledPasswordHandle.size() == 0 || providedPassword.size() == 0) return GK_ERROR;
 
-        if (!hw_device) return GK_ERROR;
-
-        if (enrolledPasswordHandle.size() != sizeof(gatekeeper::password_handle_t)) {
-            LOG(INFO) << "Password handle has wrong length";
+        if (!aidl_hw_device && !hw_device) {
+            LOG(ERROR) << "has no HAL to talk to";
             return GK_ERROR;
         }
-        const gatekeeper::password_handle_t* handle =
-                reinterpret_cast<const gatekeeper::password_handle_t*>(
-                        enrolledPasswordHandle.data());
+
+        if (hw_device) {
+            // Hidl Implementations expects passwordHandle to be in gatekeeper::password_handle_t
+            if (enrolledPasswordHandle.size() != sizeof(gatekeeper::password_handle_t)) {
+                LOG(INFO) << "Password handle has wrong length";
+                return GK_ERROR;
+            }
+        }
 
         uint32_t hw_userId = adjust_userId(userId);
         android::hardware::hidl_vec<uint8_t> curPwdHandle;
@@ -278,13 +321,36 @@
         enteredPwd.setToExternal(const_cast<uint8_t*>(providedPassword.data()),
                                  providedPassword.size());
 
-        Return<void> hwRes = hw_device->verify(
+        uint64_t secureUserId = 0;
+        if (aidl_hw_device) {
+            // AIDL gatekeeper service
+            AidlGatekeeperVerifyResp rsp;
+            auto result =
+                aidl_hw_device->verify(hw_userId, challenge, curPwdHandle, enteredPwd, &rsp);
+            if (!result.isOk()) {
+                LOG(ERROR) << "verify transaction failed";
+                return GK_ERROR;
+            }
+            if (rsp.statusCode >= AidlIGatekeeper::STATUS_OK) {
+                secureUserId = rsp.hardwareAuthToken.userId;
+                // Serialize HardwareAuthToken to a vector as hw_auth_token_t.
+                *gkResponse = GKResponse::ok(authToken2AidlVec(rsp.hardwareAuthToken),
+                                             rsp.statusCode ==
+                                                 AidlIGatekeeper::STATUS_REENROLL /* reenroll */);
+            } else if (rsp.statusCode == AidlIGatekeeper::ERROR_RETRY_TIMEOUT) {
+                *gkResponse = GKResponse::retry(rsp.timeoutMs);
+            } else {
+                *gkResponse = GKResponse::error();
+            }
+        } else if (hw_device) {
+            // HIDL gatekeeper service
+            Return<void> hwRes = hw_device->verify(
                 hw_userId, challenge, curPwdHandle, enteredPwd,
                 [&gkResponse](const GatekeeperResponse& rsp) {
                     if (rsp.code >= GatekeeperStatusCode::STATUS_OK) {
                         *gkResponse = GKResponse::ok(
-                                {rsp.data.begin(), rsp.data.end()},
-                                rsp.code == GatekeeperStatusCode::STATUS_REENROLL /* reenroll */);
+                            {rsp.data.begin(), rsp.data.end()},
+                            rsp.code == GatekeeperStatusCode::STATUS_REENROLL /* reenroll */);
                     } else if (rsp.code == GatekeeperStatusCode::ERROR_RETRY_TIMEOUT) {
                         *gkResponse = GKResponse::retry(rsp.timeout);
                     } else {
@@ -292,9 +358,14 @@
                     }
                 });
 
-        if (!hwRes.isOk()) {
-            LOG(ERROR) << "verify transaction failed";
-            return GK_ERROR;
+            if (!hwRes.isOk()) {
+                LOG(ERROR) << "verify transaction failed";
+                return GK_ERROR;
+            }
+            const gatekeeper::password_handle_t* handle =
+                reinterpret_cast<const gatekeeper::password_handle_t*>(
+                    enrolledPasswordHandle.data());
+            secureUserId = handle->user_id;
         }
 
         if (gkResponse->response_code() == GKResponseCode::OK) {
@@ -333,7 +404,7 @@
                 }
             }
 
-            maybe_store_sid(userId, handle->user_id);
+            maybe_store_sid(userId, secureUserId);
         }
 
         return Status::ok();
@@ -354,8 +425,10 @@
         }
         clear_sid(userId);
 
-        if (hw_device) {
-            uint32_t hw_userId = adjust_userId(userId);
+        uint32_t hw_userId = adjust_userId(userId);
+        if (aidl_hw_device) {
+            aidl_hw_device->deleteUser(hw_userId);
+        } else if (hw_device) {
             hw_device->deleteUser(hw_userId, [](const GatekeeperResponse&) {});
         }
         return Status::ok();
@@ -382,7 +455,7 @@
             return PERMISSION_DENIED;
         }
 
-        if (hw_device == NULL) {
+        if (aidl_hw_device == nullptr && hw_device == nullptr) {
             const char* result = "Device not available";
             write(fd, result, strlen(result) + 1);
         } else {
@@ -394,6 +467,9 @@
     }
 
   private:
+    // AIDL gatekeeper service.
+    std::shared_ptr<AidlIGatekeeper> aidl_hw_device;
+    // HIDL gatekeeper service.
     sp<IGatekeeper> hw_device;
 
     bool clear_state_if_needed_done;
@@ -414,8 +490,8 @@
 
     android::sp<android::IServiceManager> sm = android::defaultServiceManager();
     android::sp<android::GateKeeperProxy> proxy = new android::GateKeeperProxy();
-    android::status_t ret = sm->addService(
-            android::String16("android.service.gatekeeper.IGateKeeperService"), proxy);
+    android::status_t ret =
+        sm->addService(android::String16("android.service.gatekeeper.IGateKeeperService"), proxy);
     if (ret != android::OK) {
         ALOGE("Couldn't register binder service!");
         return -1;
diff --git a/healthd/Android.bp b/healthd/Android.bp
index f180006..a090b74 100644
--- a/healthd/Android.bp
+++ b/healthd/Android.bp
@@ -342,20 +342,20 @@
     ],
 }
 
-// /vendor/etc/res/images/charger/battery_fail.png
+// /vendor/etc/res/images/default/charger/battery_fail.png
 prebuilt_etc {
     name: "system_core_charger_res_images_battery_fail.png_default_vendor",
     src: "images/battery_fail.png",
-    relative_install_path: "res/images/charger/default",
+    relative_install_path: "res/images/default/charger",
     vendor: true,
     filename: "battery_fail.png",
 }
 
-// /vendor/etc/res/images/charger/battery_scale.png
+// /vendor/etc/res/images/default/charger/battery_scale.png
 prebuilt_etc {
     name: "system_core_charger_res_images_battery_scale.png_default_vendor",
     src: "images/battery_scale.png",
-    relative_install_path: "res/images/charger/default",
+    relative_install_path: "res/images/default/charger",
     vendor: true,
     filename: "battery_scale.png",
 }
diff --git a/healthd/healthd_draw.cpp b/healthd/healthd_draw.cpp
index 3e73fcd..7c79319 100644
--- a/healthd/healthd_draw.cpp
+++ b/healthd/healthd_draw.cpp
@@ -99,7 +99,7 @@
     gr_fb_blank(blank, drm);
 }
 
-/* support screen rotation for foldable phone */
+// support screen rotation for foldable phone
 void HealthdDraw::rotate_screen(int drm) {
     if (!graphics_available) return;
     if (drm == 0)
@@ -108,6 +108,11 @@
         gr_rotate(GRRotation::NONE /* Portrait mode */);
 }
 
+// detect dual display
+bool HealthdDraw::has_multiple_connectors() {
+    return graphics_available && gr_has_multiple_connectors();
+}
+
 void HealthdDraw::clear_screen(void) {
     if (!graphics_available) return;
     gr_color(0, 0, 0, 255);
diff --git a/healthd/healthd_draw.h b/healthd/healthd_draw.h
index 3d4abbd..016db8e 100644
--- a/healthd/healthd_draw.h
+++ b/healthd/healthd_draw.h
@@ -38,6 +38,9 @@
   // Rotate screen.
   virtual void rotate_screen(int drm);
 
+  // Detect dual display
+  virtual bool has_multiple_connectors();
+
   static std::unique_ptr<HealthdDraw> Create(animation *anim);
 
  protected:
diff --git a/healthd/healthd_mode_charger.cpp b/healthd/healthd_mode_charger.cpp
index 9fe85d4..1ce174b 100644
--- a/healthd/healthd_mode_charger.cpp
+++ b/healthd/healthd_mode_charger.cpp
@@ -289,6 +289,18 @@
     anim->run = false;
 }
 
+void Charger::BlankSecScreen() {
+    int drm = drm_ == DRM_INNER ? 1 : 0;
+
+    if (!init_screen_) {
+        /* blank the secondary screen */
+        healthd_draw_->blank_screen(false, drm);
+        healthd_draw_->redraw_screen(&batt_anim_, surf_unknown_);
+        healthd_draw_->blank_screen(true, drm);
+        init_screen_ = true;
+    }
+}
+
 void Charger::UpdateScreenState(int64_t now) {
     int disp_time;
 
@@ -308,36 +320,16 @@
         // If timeout and battery level is still not ready, draw unknown battery
     }
 
-    if (healthd_draw_ == nullptr) {
-        std::optional<bool> out_screen_on = configuration_->ChargerShouldKeepScreenOn();
-        if (out_screen_on.has_value()) {
-            if (!*out_screen_on) {
-                LOGV("[%" PRId64 "] leave screen off\n", now);
-                batt_anim_.run = false;
-                next_screen_transition_ = -1;
-                if (configuration_->ChargerIsOnline()) {
-                    RequestEnableSuspend();
-                }
-                return;
-            }
-        }
-
-        healthd_draw_ = HealthdDraw::Create(&batt_anim_);
-        if (healthd_draw_ == nullptr) return;
-
-#if !defined(__ANDROID_VNDK__)
-        if (android::sysprop::ChargerProperties::disable_init_blank().value_or(false)) {
-            healthd_draw_->blank_screen(true, static_cast<int>(drm_));
-            screen_blanked_ = true;
-        }
-#endif
-    }
+    if (healthd_draw_ == nullptr) return;
 
     /* animation is over, blank screen and leave */
     if (batt_anim_.num_cycles > 0 && batt_anim_.cur_cycle == batt_anim_.num_cycles) {
         reset_animation(&batt_anim_);
         next_screen_transition_ = -1;
         healthd_draw_->blank_screen(true, static_cast<int>(drm_));
+        if (healthd_draw_->has_multiple_connectors()) {
+            BlankSecScreen();
+        }
         screen_blanked_ = true;
         LOGV("[%" PRId64 "] animation done\n", now);
         if (configuration_->ChargerIsOnline()) {
@@ -736,6 +728,33 @@
     }
 }
 
+void Charger::InitHealthdDraw() {
+    if (healthd_draw_ == nullptr) {
+        std::optional<bool> out_screen_on = configuration_->ChargerShouldKeepScreenOn();
+        if (out_screen_on.has_value()) {
+            if (!*out_screen_on) {
+                LOGV("[%" PRId64 "] leave screen off\n", curr_time_ms());
+                batt_anim_.run = false;
+                next_screen_transition_ = -1;
+                if (configuration_->ChargerIsOnline()) {
+                    RequestEnableSuspend();
+                }
+                return;
+            }
+        }
+
+        healthd_draw_ = HealthdDraw::Create(&batt_anim_);
+        if (healthd_draw_ == nullptr) return;
+
+#if !defined(__ANDROID_VNDK__)
+        if (android::sysprop::ChargerProperties::disable_init_blank().value_or(false)) {
+            healthd_draw_->blank_screen(true, static_cast<int>(drm_));
+            screen_blanked_ = true;
+        }
+#endif
+    }
+}
+
 void Charger::OnInit(struct healthd_config* config) {
     int ret;
     int i;
@@ -753,6 +772,7 @@
     }
 
     InitAnimation();
+    InitHealthdDraw();
 
     ret = CreateDisplaySurface(batt_anim_.fail_file, &surf_unknown_);
     if (ret < 0) {
diff --git a/healthd/include_charger/charger/healthd_mode_charger.h b/healthd/include_charger/charger/healthd_mode_charger.h
index 28e1fb5..c463b92 100644
--- a/healthd/include_charger/charger/healthd_mode_charger.h
+++ b/healthd/include_charger/charger/healthd_mode_charger.h
@@ -104,12 +104,15 @@
     void HandleInputState(int64_t now);
     void HandlePowerSupplyState(int64_t now);
     int InputCallback(int fd, unsigned int epevents);
+    void InitHealthdDraw();
     void InitAnimation();
     int RequestEnableSuspend();
     int RequestDisableSuspend();
+    void BlankSecScreen();
 
     bool have_battery_state_ = false;
     bool screen_blanked_ = false;
+    bool init_screen_ = false;
     int64_t next_screen_transition_ = 0;
     int64_t next_key_check_ = 0;
     int64_t next_pwr_check_ = 0;
diff --git a/init/Android.bp b/init/Android.bp
index dd67d04..c7e7de8 100644
--- a/init/Android.bp
+++ b/init/Android.bp
@@ -39,6 +39,7 @@
     "epoll.cpp",
     "import_parser.cpp",
     "interface_utils.cpp",
+    "interprocess_fifo.cpp",
     "keychords.cpp",
     "parser.cpp",
     "property_type.cpp",
@@ -53,6 +54,7 @@
     "util.cpp",
 ]
 init_device_sources = [
+    "apex_init_util.cpp",
     "block_dev_initializer.cpp",
     "bootchart.cpp",
     "builtins.cpp",
@@ -107,21 +109,22 @@
         misc_undefined: ["signed-integer-overflow"],
     },
     cflags: [
-        "-DLOG_UEVENTS=0",
-        "-Wall",
-        "-Wextra",
-        "-Wno-unused-parameter",
-        "-Werror",
-        "-Wthread-safety",
         "-DALLOW_FIRST_STAGE_CONSOLE=0",
         "-DALLOW_LOCAL_PROP_OVERRIDE=0",
         "-DALLOW_PERMISSIVE_SELINUX=0",
-        "-DREBOOT_BOOTLOADER_ON_PANIC=0",
-        "-DWORLD_WRITABLE_KMSG=0",
+        "-DANDROID_BASE_UNIQUE_FD_DISABLE_IMPLICIT_CONVERSION",
         "-DDUMP_ON_UMOUNT_FAILURE=0",
-        "-DSHUTDOWN_ZERO_TIMEOUT=0",
         "-DINIT_FULL_SOURCES",
         "-DINSTALL_DEBUG_POLICY_TO_SYSTEM_EXT=0",
+        "-DLOG_UEVENTS=0",
+        "-DREBOOT_BOOTLOADER_ON_PANIC=0",
+        "-DSHUTDOWN_ZERO_TIMEOUT=0",
+        "-DWORLD_WRITABLE_KMSG=0",
+        "-Wall",
+        "-Werror",
+        "-Wextra",
+        "-Wno-unused-parameter",
+        "-Wthread-safety",
     ],
     product_variables: {
         debuggable: {
@@ -160,10 +163,12 @@
     },
     static_libs: [
         "libavb",
+        "libbootloader_message",
         "libc++fs",
         "libcgrouprc_format",
         "libfsverity_init",
         "liblmkd_utils",
+        "liblz4",
         "libmini_keyctl_static",
         "libmodprobe",
         "libprocinfo",
@@ -178,9 +183,7 @@
         "update_metadata-protos",
     ],
     shared_libs: [
-        "libbacktrace",
         "libbase",
-        "libbootloader_message",
         "libcrypto",
         "libcutils",
         "libdl",
@@ -195,13 +198,21 @@
         "libprocessgroup",
         "libprocessgroup_setup",
         "libselinux",
+        "libunwindstack",
         "libutils",
         "libziparchive",
     ],
+    header_libs: ["bionic_libc_platform_headers"],
     bootstrap: true,
     visibility: [":__subpackages__"],
 }
 
+cc_library_headers {
+    name: "libinit_headers",
+    export_include_dirs: ["."],
+    visibility: [":__subpackages__"],
+}
+
 cc_library_static {
     name: "libinit",
     recovery_available: true,
@@ -210,13 +221,14 @@
         "selinux_policy_version",
     ],
     srcs: init_common_sources + init_device_sources,
+    export_include_dirs: ["."],
     generated_sources: [
         "apex-info-list",
     ],
     whole_static_libs: [
         "libcap",
-        "com.android.sysprop.apex",
-        "com.android.sysprop.init",
+        "libcom.android.sysprop.apex",
+        "libcom.android.sysprop.init",
     ],
     header_libs: ["bootimg_headers"],
     proto: {
@@ -239,6 +251,10 @@
             ],
         },
     },
+    visibility: [
+        "//system/apex/apexd",
+        "//frameworks/native/cmds/installd",
+    ],
 }
 
 phony {
@@ -262,7 +278,7 @@
                 "init.rc",
                 "ueventd.rc",
                 "e2fsdroid",
-                "extra_free_kbytes.sh",
+                "extra_free_kbytes",
                 "make_f2fs",
                 "mke2fs",
                 "sload_f2fs",
@@ -294,7 +310,7 @@
     name: "init_first_stage_cc_defaults",
     module_type: "cc_defaults",
     config_namespace: "ANDROID",
-    bool_variables: ["BOARD_BUILD_SYSTEM_ROOT_IMAGE", "BOARD_USES_RECOVERY_AS_BOOT"],
+    bool_variables: ["BOARD_USES_RECOVERY_AS_BOOT"],
     properties: ["installable"],
 }
 
@@ -303,9 +319,6 @@
 init_first_stage_cc_defaults {
     name: "init_first_stage_defaults",
     soong_config_variables: {
-        BOARD_BUILD_SYSTEM_ROOT_IMAGE: {
-            installable: false,
-        },
         BOARD_USES_RECOVERY_AS_BOOT: {
             installable: false,
         },
@@ -352,11 +365,11 @@
         "libgsi",
         "liblzma",
         "libunwindstack_no_dex",
-        "libbacktrace_no_dex",
         "libmodprobe",
         "libext2_uuid",
         "libprotobuf-cpp-lite",
         "libsnapshot_cow",
+        "liblz4",
         "libsnapshot_init",
         "update_metadata-protos",
         "libprocinfo",
@@ -456,6 +469,7 @@
         "epoll_test.cpp",
         "firmware_handler_test.cpp",
         "init_test.cpp",
+        "interprocess_fifo_test.cpp",
         "keychords_test.cpp",
         "oneshot_on_test.cpp",
         "persistent_properties_test.cpp",
@@ -470,7 +484,10 @@
         "ueventd_test.cpp",
         "util_test.cpp",
     ],
-    static_libs: ["libinit"],
+    static_libs: [
+        "libgmock",
+        "libinit",
+    ],
 
     test_suites: [
         "cts",
@@ -516,6 +533,7 @@
         "libcap",
     ],
     export_include_dirs: ["test_utils/include"], // for tests
+    header_libs: ["bionic_libc_platform_headers"],
 }
 
 // Host Verifier
@@ -594,6 +612,7 @@
 }
 
 sh_binary {
-    name: "extra_free_kbytes.sh",
+    name: "extra_free_kbytes",
     src: "extra_free_kbytes.sh",
+    filename_from_src: true,
 }
diff --git a/init/Android.mk b/init/Android.mk
index c08fe03..4b85c15 100644
--- a/init/Android.mk
+++ b/init/Android.mk
@@ -8,11 +8,9 @@
 LOCAL_LICENSE_KINDS := SPDX-license-identifier-Apache-2.0
 LOCAL_LICENSE_CONDITIONS := notice
 LOCAL_NOTICE_FILE := $(LOCAL_PATH)/NOTICE
-ifneq ($(BOARD_BUILD_SYSTEM_ROOT_IMAGE),true)
 ifneq ($(BOARD_USES_RECOVERY_AS_BOOT),true)
 LOCAL_REQUIRED_MODULES := \
    init_first_stage \
 
 endif  # BOARD_USES_RECOVERY_AS_BOOT
-endif  # BOARD_BUILD_SYSTEM_ROOT_IMAGE
 include $(BUILD_PHONY_PACKAGE)
diff --git a/init/README.md b/init/README.md
index aaafe78..957eb9e 100644
--- a/init/README.md
+++ b/init/README.md
@@ -162,6 +162,17 @@
     setprop e 1
     setprop f 2
 
+If the property `true` wasn't `true` when the `boot` was triggered, then the
+order of the commands executed will be:
+
+    setprop a 1
+    setprop b 2
+    setprop e 1
+    setprop f 2
+
+If the property `true` becomes `true` *AFTER* `boot` was triggered, nothing will
+be executed. The condition `boot && property:true=true` will be evaluated to
+false because the `boot` trigger is a past event.
 
 Services
 --------
@@ -184,8 +195,10 @@
   capability without the "CAP\_" prefix, like "NET\_ADMIN" or "SETPCAP". See
   http://man7.org/linux/man-pages/man7/capabilities.7.html for a list of Linux
   capabilities.
-  If no capabilities are provided, then all capabilities are removed from this service, even if it
-  runs as root.
+  If no capabilities are provided, then behaviour depends on the user the service runs under:
+    * if it's root, then the service will run with all the capabitilies (note: whether the
+        service can actually use them is controlled by selinux);
+    * otherwise all capabilities will be dropped.
 
 `class <name> [ <name>\* ]`
 > Specify class names for the service.  All services in a
@@ -368,8 +381,9 @@
   given console.
 
 `task_profiles <profile> [ <profile>\* ]`
-> Set task profiles for the process when it forks. This is designed to replace the use of
-  writepid option for moving a process into a cgroup.
+> Set task profiles. Before Android U, the profiles are applied to the main thread of the service.
+  For Android U and later, the profiles are applied to the entire service process. This is designed
+  to replace the use of writepid option for moving a process into a cgroup.
 
 `timeout_period <seconds>`
 > Provide a timeout after which point the service will be killed. The oneshot keyword is respected
@@ -398,7 +412,7 @@
   using this new mechanism, processes can use the user option to
   select their desired uid without ever running as root.
   As of Android O, processes can also request capabilities directly in their .rc
-  files. See the "capabilities" option below.
+  files. See the "capabilities" option above.
 
 `writepid <file> [ <file>\* ]`
 > Write the child's pid to the given files when it forks. Meant for
@@ -432,7 +446,9 @@
 
 For example:
 `on boot && property:a=b` defines an action that is only executed when
-the 'boot' event trigger happens and the property a equals b.
+the 'boot' event trigger happens and the property a equals b at the moment. This
+will NOT be executed when the property a transitions to value b after the `boot`
+event was triggered.
 
 `on property:a=b && property:c=d` defines an action that is executed
 at three times:
@@ -607,8 +623,12 @@
   group. If not provided, the directory is created with permissions 755 and
   owned by the root user and root group. If provided, the mode, owner and group
   will be updated if the directory exists already.
+  If the directory does not exist, it will receive the security context from
+  the current SELinux policy or its parent if not specified in the policy. If
+  the directory exists, its security context will not be changed (even if
+  different from the policy).
 
- > _action_ can be one of:
+  > _action_ can be one of:
   * `None`: take no encryption action; directory will be encrypted if parent is.
   * `Require`: encrypt directory, abort boot process if encryption fails
   * `Attempt`: try to set an encryption policy, but continue if it fails
diff --git a/init/TEST_MAPPING b/init/TEST_MAPPING
index fa1627c..402b501 100644
--- a/init/TEST_MAPPING
+++ b/init/TEST_MAPPING
@@ -8,9 +8,17 @@
     },
     {
       "name": "MicrodroidHostTestCases"
+    },
+    {
+      "name": "CtsSecurityHostTestCases",
+      "options": [
+        {
+          "include-filter": "android.security.cts.SeamendcHostTest"
+        }
+      ]
     }
   ],
-  "hwasan-postsubmit": [
+  "hwasan-presubmit": [
     {
       "name": "CtsInitTestCases"
     },
@@ -19,6 +27,14 @@
     },
     {
       "name": "MicrodroidHostTestCases"
+    },
+    {
+      "name": "CtsSecurityHostTestCases",
+      "options": [
+        {
+          "include-filter": "android.security.cts.SeamendcHostTest"
+        }
+      ]
     }
   ]
 }
diff --git a/init/action.h b/init/action.h
index 1534bf9..eddc384 100644
--- a/init/action.h
+++ b/init/action.h
@@ -22,6 +22,8 @@
 #include <variant>
 #include <vector>
 
+#include <android-base/strings.h>
+
 #include "builtins.h"
 #include "keyword_map.h"
 #include "result.h"
@@ -79,6 +81,7 @@
     static void set_function_map(const BuiltinFunctionMap* function_map) {
         function_map_ = function_map;
     }
+    bool IsFromApex() const { return base::StartsWith(filename_, "/apex/"); }
 
   private:
     void ExecuteCommand(const Command& command) const;
diff --git a/init/action_manager.h b/init/action_manager.h
index b6f93d9..68912a8 100644
--- a/init/action_manager.h
+++ b/init/action_manager.h
@@ -37,6 +37,10 @@
     size_t CheckAllCommands();
 
     void AddAction(std::unique_ptr<Action> action);
+    template <class UnaryPredicate>
+    void RemoveActionIf(UnaryPredicate predicate) {
+        actions_.erase(std::remove_if(actions_.begin(), actions_.end(), predicate), actions_.end());
+    }
     void QueueEventTrigger(const std::string& trigger);
     void QueuePropertyChange(const std::string& name, const std::string& value);
     void QueueAllPropertyActions();
@@ -45,6 +49,7 @@
     bool HasMoreCommands() const;
     void DumpState() const;
     void ClearQueue();
+    auto size() const { return actions_.size(); }
 
   private:
     ActionManager(ActionManager const&) = delete;
diff --git a/init/action_parser.cpp b/init/action_parser.cpp
index 52f6a1f..49fe24a 100644
--- a/init/action_parser.cpp
+++ b/init/action_parser.cpp
@@ -142,6 +142,14 @@
         action_subcontext = subcontext_;
     }
 
+    // We support 'on' for only Vendor APEXes from /{vendor, odm}.
+    // It is to prevent mainline modules from using 'on' triggers because events/properties are
+    // not stable for mainline modules.
+    // Note that this relies on Subcontext::PathMatchesSubcontext() to identify Vendor APEXes.
+    if (StartsWith(filename, "/apex/") && !action_subcontext) {
+        return Error() << "ParseSection() failed: 'on' is supported for only Vendor APEXes.";
+    }
+
     std::string event_trigger;
     std::map<std::string, std::string> property_triggers;
 
diff --git a/init/apex_init_util.cpp b/init/apex_init_util.cpp
new file mode 100644
index 0000000..d618a6e
--- /dev/null
+++ b/init/apex_init_util.cpp
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "apex_init_util.h"
+
+#include <glob.h>
+
+#include <map>
+#include <vector>
+
+#include <android-base/logging.h>
+#include <android-base/result.h>
+#include <android-base/properties.h>
+#include <android-base/strings.h>
+
+#include "action_manager.h"
+#include "init.h"
+#include "parser.h"
+#include "service_list.h"
+#include "util.h"
+
+namespace android {
+namespace init {
+
+static Result<std::vector<std::string>> CollectApexConfigs(const std::string& apex_name) {
+    glob_t glob_result;
+    std::string glob_pattern = apex_name.empty() ?
+            "/apex/*/etc/*rc" : "/apex/" + apex_name + "/etc/*rc";
+
+    const int ret = glob(glob_pattern.c_str(), GLOB_MARK, nullptr, &glob_result);
+    if (ret != 0 && ret != GLOB_NOMATCH) {
+        globfree(&glob_result);
+        return Error() << "Glob pattern '" << glob_pattern << "' failed";
+    }
+    std::vector<std::string> configs;
+    for (size_t i = 0; i < glob_result.gl_pathc; i++) {
+        std::string path = glob_result.gl_pathv[i];
+        // Filter-out /apex/<name>@<ver> paths. The paths are bind-mounted to
+        // /apex/<name> paths, so unless we filter them out, we will parse the
+        // same file twice.
+        std::vector<std::string> paths = android::base::Split(path, "/");
+        if (paths.size() >= 3 && paths[2].find('@') != std::string::npos) {
+            continue;
+        }
+        // Filter directories
+        if (path.back() == '/') {
+            continue;
+        }
+        configs.push_back(path);
+    }
+    globfree(&glob_result);
+    return configs;
+}
+
+static Result<void> ParseConfigs(const std::vector<std::string>& configs) {
+    Parser parser = CreateApexConfigParser(ActionManager::GetInstance(),
+                     ServiceList::GetInstance());
+    bool success = true;
+    for (const auto& c : configs) {
+        success &= parser.ParseConfigFile(c);
+    }
+
+    if (success) {
+        return {};
+    } else {
+        return Error() << "Unable to parse apex configs";
+    }
+}
+
+Result<void> ParseApexConfigs(const std::string& apex_name) {
+    auto configs = OR_RETURN(CollectApexConfigs(apex_name));
+
+    if (configs.empty()) {
+        return {};
+    }
+
+    auto filtered_configs = FilterVersionedConfigs(configs,
+                                    android::base::GetIntProperty("ro.build.version.sdk", INT_MAX));
+    return ParseConfigs(filtered_configs);
+}
+
+}  // namespace init
+}  // namespace android
diff --git a/init/apex_init_util.h b/init/apex_init_util.h
new file mode 100644
index 0000000..43f8ad5
--- /dev/null
+++ b/init/apex_init_util.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include "result.h"
+
+namespace android {
+namespace init {
+
+// Parse all config files for a given apex.
+// If apex name is empty(""), config files for all apexes will be parsed.
+Result<void> ParseApexConfigs(const std::string& apex_name);
+
+}  // namespace init
+}  // namespace android
diff --git a/init/builtins.cpp b/init/builtins.cpp
index 01db4f5..a89813e 100644
--- a/init/builtins.cpp
+++ b/init/builtins.cpp
@@ -69,6 +69,7 @@
 #include <system/thread_defs.h>
 
 #include "action_manager.h"
+#include "apex_init_util.h"
 #include "bootchart.h"
 #include "builtin_arguments.h"
 #include "fscrypt_init_extensions.h"
@@ -330,13 +331,13 @@
     unique_fd s(TEMP_FAILURE_RETRY(socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0)));
     if (s < 0) return ErrnoError() << "opening socket failed";
 
-    if (ioctl(s, SIOCGIFFLAGS, &ifr) < 0) {
+    if (ioctl(s.get(), SIOCGIFFLAGS, &ifr) < 0) {
         return ErrnoError() << "ioctl(..., SIOCGIFFLAGS, ...) failed";
     }
 
     ifr.ifr_flags |= IFF_UP;
 
-    if (ioctl(s, SIOCSIFFLAGS, &ifr) < 0) {
+    if (ioctl(s.get(), SIOCSIFFLAGS, &ifr) < 0) {
         return ErrnoError() << "ioctl(..., SIOCSIFFLAGS, ...) failed";
     }
 
@@ -426,7 +427,7 @@
             return ErrnoError() << "fchmodat() failed on " << options.target;
         }
     }
-    if (fscrypt_is_native()) {
+    if (IsFbeEnabled()) {
         if (!FscryptSetDirectoryPolicy(ref_basename, options.fscrypt_action, options.target)) {
             return reboot_into_recovery(
                     {"--prompt_and_wipe_data", "--reason=set_policy_failed:"s + options.target});
@@ -515,11 +516,11 @@
 
             loop_info info;
             /* if it is a blank loop device */
-            if (ioctl(loop, LOOP_GET_STATUS, &info) < 0 && errno == ENXIO) {
+            if (ioctl(loop.get(), LOOP_GET_STATUS, &info) < 0 && errno == ENXIO) {
                 /* if it becomes our loop device */
-                if (ioctl(loop, LOOP_SET_FD, fd.get()) >= 0) {
+                if (ioctl(loop.get(), LOOP_SET_FD, fd.get()) >= 0) {
                     if (mount(tmp.c_str(), target, system, flags, options) < 0) {
-                        ioctl(loop, LOOP_CLR_FD, 0);
+                        ioctl(loop.get(), LOOP_CLR_FD, 0);
                         return ErrnoError() << "mount() failed";
                     }
                     return {};
@@ -878,6 +879,8 @@
             SetProperty("partition." + partition + ".verified.hash_alg", hashtree_info->algorithm);
             SetProperty("partition." + partition + ".verified.root_digest",
                         hashtree_info->root_digest);
+            SetProperty("partition." + partition + ".verified.check_at_most_once",
+                        hashtree_info->check_at_most_once ? "1" : "0");
         }
     }
 
@@ -898,16 +901,16 @@
     if (fd == -1) {
         return ErrnoError() << "Error opening file";
     }
-    if (posix_fadvise(fd, 0, 0, POSIX_FADV_WILLNEED)) {
+    if (posix_fadvise(fd.get(), 0, 0, POSIX_FADV_WILLNEED)) {
         return ErrnoError() << "Error posix_fadvise file";
     }
-    if (readahead(fd, 0, std::numeric_limits<size_t>::max())) {
+    if (readahead(fd.get(), 0, std::numeric_limits<size_t>::max())) {
         return ErrnoError() << "Error readahead file";
     }
     if (fully) {
         char buf[BUFSIZ];
         ssize_t n;
-        while ((n = TEMP_FAILURE_RETRY(read(fd, &buf[0], sizeof(buf)))) > 0) {
+        while ((n = TEMP_FAILURE_RETRY(read(fd.get(), &buf[0], sizeof(buf)))) > 0) {
         }
         if (n != 0) {
             return ErrnoError() << "Error reading file";
@@ -1175,7 +1178,7 @@
     auto reboot = [reboot_reason, should_reboot_into_recovery](const std::string& message) {
         // TODO (b/122850122): support this in gsi
         if (should_reboot_into_recovery) {
-            if (fscrypt_is_native() && !android::gsi::IsGsiRunning()) {
+            if (IsFbeEnabled() && !android::gsi::IsGsiRunning()) {
                 LOG(ERROR) << message << ": Rebooting into recovery, reason: " << reboot_reason;
                 if (auto result = reboot_into_recovery(
                             {"--prompt_and_wipe_data", "--reason="s + reboot_reason});
@@ -1279,47 +1282,6 @@
     return GenerateLinkerConfiguration();
 }
 
-static Result<void> parse_apex_configs() {
-    glob_t glob_result;
-    static constexpr char glob_pattern[] = "/apex/*/etc/*rc";
-    const int ret = glob(glob_pattern, GLOB_MARK, nullptr, &glob_result);
-    if (ret != 0 && ret != GLOB_NOMATCH) {
-        globfree(&glob_result);
-        return Error() << "glob pattern '" << glob_pattern << "' failed";
-    }
-    std::vector<std::string> configs;
-    Parser parser = CreateServiceOnlyParser(ServiceList::GetInstance(), true);
-    for (size_t i = 0; i < glob_result.gl_pathc; i++) {
-        std::string path = glob_result.gl_pathv[i];
-        // Filter-out /apex/<name>@<ver> paths. The paths are bind-mounted to
-        // /apex/<name> paths, so unless we filter them out, we will parse the
-        // same file twice.
-        std::vector<std::string> paths = android::base::Split(path, "/");
-        if (paths.size() >= 3 && paths[2].find('@') != std::string::npos) {
-            continue;
-        }
-        // Filter directories
-        if (path.back() == '/') {
-            continue;
-        }
-        configs.push_back(path);
-    }
-    globfree(&glob_result);
-
-    int active_sdk = android::base::GetIntProperty("ro.build.version.sdk", INT_MAX);
-
-    bool success = true;
-    for (const auto& c : parser.FilterVersionedConfigs(configs, active_sdk)) {
-        success &= parser.ParseConfigFile(c);
-    }
-    ServiceList::GetInstance().MarkServicesUpdate();
-    if (success) {
-        return {};
-    } else {
-        return Error() << "Could not parse apex configs";
-    }
-}
-
 /*
  * Creates a directory under /data/misc/apexdata/ for each APEX.
  */
@@ -1350,7 +1312,8 @@
     if (!create_dirs.ok()) {
         return create_dirs.error();
     }
-    auto parse_configs = parse_apex_configs();
+    auto parse_configs = ParseApexConfigs(/*apex_name=*/"");
+    ServiceList::GetInstance().MarkServicesUpdate();
     if (!parse_configs.ok()) {
         return parse_configs.error();
     }
diff --git a/init/compare-bootcharts.py b/init/compare-bootcharts.py
index 2057b55..009b639 100755
--- a/init/compare-bootcharts.py
+++ b/init/compare-bootcharts.py
@@ -56,24 +56,24 @@
     ]
 
     jw = jiffy_record['jiffy_to_wallclock']
-    print "process: baseline experiment (delta)"
-    print " - Unit is ms (a jiffy is %d ms on the system)" % jw
-    print "------------------------------------"
+    print("process: baseline experiment (delta)")
+    print(" - Unit is ms (a jiffy is %d ms on the system)" % jw)
+    print("------------------------------------")
     for p in processes_of_interest:
         # e.g., 32-bit system doesn't have zygote64
         if p in process_map1 and p in process_map2:
-            print "%s: %d %d (%+d)" % (
+            print("%s: %d %d (%+d)" % (
                 p, process_map1[p]['start_time'] * jw,
                 process_map2[p]['start_time'] * jw,
                 (process_map2[p]['start_time'] -
-                 process_map1[p]['start_time']) * jw)
+                 process_map1[p]['start_time']) * jw))
 
     # Print the last tick for the bootanimation process
-    print "bootanimation ends at: %d %d (%+d)" % (
+    print("bootanimation ends at: %d %d (%+d)" % (
         process_map1['/system/bin/bootanimation']['last_tick'] * jw,
         process_map2['/system/bin/bootanimation']['last_tick'] * jw,
         (process_map2['/system/bin/bootanimation']['last_tick'] -
-            process_map1['/system/bin/bootanimation']['last_tick']) * jw)
+            process_map1['/system/bin/bootanimation']['last_tick']) * jw))
 
 def parse_proc_file(pathname, process_map, jiffy_record=None):
     # Uncompress bootchart.tgz
@@ -83,7 +83,7 @@
             f = tf.extractfile('proc_ps.log')
 
             # Break proc_ps into chunks based on timestamps
-            blocks = f.read().split('\n\n')
+            blocks = f.read().decode('utf-8').split('\n\n')
             for b in blocks:
                 lines = b.split('\n')
                 if not lines[0]:
@@ -133,7 +133,7 @@
 
 def main():
     if len(sys.argv) != 3:
-        print "Usage: %s base_bootchart_dir exp_bootchart_dir" % sys.argv[0]
+        print("Usage: %s base_bootchart_dir exp_bootchart_dir" % sys.argv[0])
         sys.exit(1)
 
     process_map1 = {}
diff --git a/init/devices.cpp b/init/devices.cpp
index d4a3cb9..8bc6e52 100644
--- a/init/devices.cpp
+++ b/init/devices.cpp
@@ -307,8 +307,8 @@
         PLOG(ERROR) << "setegid(" << gid << ") for " << path << " device failed";
         goto out;
     }
-    /* If the node already exists update its SELinux label to handle cases when
-     * it was created with the wrong context during coldboot procedure. */
+    /* If the node already exists update its SELinux label and the file mode to handle cases when
+     * it was created with the wrong context and file mode during coldboot procedure. */
     if (mknod(path.c_str(), mode, dev) && (errno == EEXIST) && !secontext.empty()) {
         char* fcon = nullptr;
         int rc = lgetfilecon(path.c_str(), &fcon);
@@ -330,6 +330,11 @@
             if (gid != s.st_gid) {
                 new_group = gid;
             }
+        if (mode != s.st_mode) {
+            if (chmod(path.c_str(), mode) != 0) {
+                PLOG(ERROR) << "Cannot chmod " << path << " to " << mode;
+            }
+        }
         } else {
             PLOG(ERROR) << "Cannot stat " << path;
         }
@@ -465,7 +470,11 @@
         MakeDevice(devpath, block, major, minor, links);
     }
 
-    // We don't have full device-mapper information until a change event is fired.
+    // Handle device-mapper nodes.
+    // On kernels <= 5.10, the "add" event is fired on DM_DEV_CREATE, but does not contain name
+    // information until DM_TABLE_LOAD - thus, we wait for a "change" event.
+    // On kernels >= 5.15, the "add" event is fired on DM_TABLE_LOAD, followed by a "change"
+    // event.
     if (action == "add" || (action == "change" && StartsWith(devpath, "/dev/block/dm-"))) {
         for (const auto& link : links) {
             if (!mkdir_recursive(Dirname(link), 0755)) {
diff --git a/init/epoll.cpp b/init/epoll.cpp
index 0580f86..cd73a0c 100644
--- a/init/epoll.cpp
+++ b/init/epoll.cpp
@@ -45,19 +45,19 @@
         return Error() << "Must specify events";
     }
 
-    Info info;
-    info.events = events;
-    info.handler = std::make_shared<decltype(handler)>(std::move(handler));
-    auto [it, inserted] = epoll_handlers_.emplace(fd, std::move(info));
+    auto [it, inserted] = epoll_handlers_.emplace(
+            fd, Info{
+                        .events = events,
+                        .handler = std::move(handler),
+                });
     if (!inserted) {
         return Error() << "Cannot specify two epoll handlers for a given FD";
     }
-    epoll_event ev;
-    ev.events = events;
-    // std::map's iterators do not get invalidated until erased, so we use the
-    // pointer to the std::function in the map directly for epoll_ctl.
-    ev.data.ptr = reinterpret_cast<void*>(&it->second);
-    if (epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, fd, &ev) == -1) {
+    epoll_event ev = {
+            .events = events,
+            .data.fd = fd,
+    };
+    if (epoll_ctl(epoll_fd_.get(), EPOLL_CTL_ADD, fd, &ev) == -1) {
         Result<void> result = ErrnoError() << "epoll_ctl failed to add fd";
         epoll_handlers_.erase(fd);
         return result;
@@ -66,40 +66,54 @@
 }
 
 Result<void> Epoll::UnregisterHandler(int fd) {
-    if (epoll_ctl(epoll_fd_, EPOLL_CTL_DEL, fd, nullptr) == -1) {
+    if (epoll_ctl(epoll_fd_.get(), EPOLL_CTL_DEL, fd, nullptr) == -1) {
         return ErrnoError() << "epoll_ctl failed to remove fd";
     }
-    if (epoll_handlers_.erase(fd) != 1) {
+    auto it = epoll_handlers_.find(fd);
+    if (it == epoll_handlers_.end()) {
         return Error() << "Attempting to remove epoll handler for FD without an existing handler";
     }
+    to_remove_.insert(it->first);
     return {};
 }
 
-Result<std::vector<std::shared_ptr<Epoll::Handler>>> Epoll::Wait(
-        std::optional<std::chrono::milliseconds> timeout) {
+void Epoll::SetFirstCallback(std::function<void()> first_callback) {
+    first_callback_ = std::move(first_callback);
+}
+
+Result<int> Epoll::Wait(std::optional<std::chrono::milliseconds> timeout) {
     int timeout_ms = -1;
     if (timeout && timeout->count() < INT_MAX) {
         timeout_ms = timeout->count();
     }
     const auto max_events = epoll_handlers_.size();
     epoll_event ev[max_events];
-    auto num_events = TEMP_FAILURE_RETRY(epoll_wait(epoll_fd_, ev, max_events, timeout_ms));
+    auto num_events = TEMP_FAILURE_RETRY(epoll_wait(epoll_fd_.get(), ev, max_events, timeout_ms));
     if (num_events == -1) {
         return ErrnoError() << "epoll_wait failed";
     }
-    std::vector<std::shared_ptr<Handler>> pending_functions;
+    if (num_events > 0 && first_callback_) {
+        first_callback_();
+    }
     for (int i = 0; i < num_events; ++i) {
-        auto& info = *reinterpret_cast<Info*>(ev[i].data.ptr);
+        const auto it = epoll_handlers_.find(ev[i].data.fd);
+        if (it == epoll_handlers_.end()) {
+            continue;
+        }
+        const Info& info = it->second;
         if ((info.events & (EPOLLIN | EPOLLPRI)) == (EPOLLIN | EPOLLPRI) &&
             (ev[i].events & EPOLLIN) != ev[i].events) {
             // This handler wants to know about exception events, and just got one.
             // Log something informational.
             LOG(ERROR) << "Received unexpected epoll event set: " << ev[i].events;
         }
-        pending_functions.emplace_back(info.handler);
+        info.handler();
+        for (auto fd : to_remove_) {
+            epoll_handlers_.erase(fd);
+        }
+        to_remove_.clear();
     }
-
-    return pending_functions;
+    return num_events;
 }
 
 }  // namespace init
diff --git a/init/epoll.h b/init/epoll.h
index f58ae8d..1e71803 100644
--- a/init/epoll.h
+++ b/init/epoll.h
@@ -24,6 +24,7 @@
 #include <map>
 #include <memory>
 #include <optional>
+#include <unordered_set>
 #include <vector>
 
 #include <android-base/unique_fd.h>
@@ -42,17 +43,19 @@
     Result<void> Open();
     Result<void> RegisterHandler(int fd, Handler handler, uint32_t events = EPOLLIN);
     Result<void> UnregisterHandler(int fd);
-    Result<std::vector<std::shared_ptr<Handler>>> Wait(
-            std::optional<std::chrono::milliseconds> timeout);
+    void SetFirstCallback(std::function<void()> first_callback);
+    Result<int> Wait(std::optional<std::chrono::milliseconds> timeout);
 
   private:
     struct Info {
-        std::shared_ptr<Handler> handler;
+        Handler handler;
         uint32_t events;
     };
 
     android::base::unique_fd epoll_fd_;
     std::map<int, Info> epoll_handlers_;
+    std::function<void()> first_callback_;
+    std::unordered_set<int> to_remove_;
 };
 
 }  // namespace init
diff --git a/init/epoll_test.cpp b/init/epoll_test.cpp
index 9236cd5..7105a68 100644
--- a/init/epoll_test.cpp
+++ b/init/epoll_test.cpp
@@ -21,6 +21,7 @@
 #include <unordered_set>
 
 #include <android-base/file.h>
+#include <android-base/logging.h>
 #include <gtest/gtest.h>
 
 namespace android {
@@ -30,14 +31,10 @@
 
 class CatchDtor final {
   public:
-    CatchDtor() { sValidObjects.emplace(this); }
-    CatchDtor(const CatchDtor&) { sValidObjects.emplace(this); }
-    ~CatchDtor() {
-        auto iter = sValidObjects.find(this);
-        if (iter != sValidObjects.end()) {
-            sValidObjects.erase(iter);
-        }
-    }
+    CatchDtor() { CHECK(sValidObjects.emplace(this).second); }
+    CatchDtor(const CatchDtor&) { CHECK(sValidObjects.emplace(this).second); }
+    CatchDtor(const CatchDtor&&) { CHECK(sValidObjects.emplace(this).second); }
+    ~CatchDtor() { CHECK_EQ(sValidObjects.erase(this), size_t{1}); }
 };
 
 TEST(epoll, UnregisterHandler) {
@@ -48,11 +45,13 @@
     ASSERT_EQ(pipe(fds), 0);
 
     CatchDtor catch_dtor;
-    bool handler_invoked;
+    bool handler_invoked = false;
     auto handler = [&, catch_dtor]() -> void {
         auto result = epoll.UnregisterHandler(fds[0]);
         ASSERT_EQ(result.ok(), !handler_invoked);
         handler_invoked = true;
+        // The assert statement below verifies that the UnregisterHandler() call
+        // above did not destroy the current std::function<> instance.
         ASSERT_NE(sValidObjects.find((void*)&catch_dtor), sValidObjects.end());
     };
 
@@ -61,14 +60,9 @@
     uint8_t byte = 0xee;
     ASSERT_TRUE(android::base::WriteFully(fds[1], &byte, sizeof(byte)));
 
-    auto results = epoll.Wait({});
-    ASSERT_RESULT_OK(results);
-    ASSERT_EQ(results->size(), size_t(1));
-
-    for (const auto& function : *results) {
-        (*function)();
-        (*function)();
-    }
+    auto epoll_result = epoll.Wait({});
+    ASSERT_RESULT_OK(epoll_result);
+    ASSERT_EQ(*epoll_result, 1);
     ASSERT_TRUE(handler_invoked);
 }
 
diff --git a/init/extra_free_kbytes.sh b/init/extra_free_kbytes.sh
index aeaa912..a0141be 100755
--- a/init/extra_free_kbytes.sh
+++ b/init/extra_free_kbytes.sh
@@ -77,7 +77,19 @@
     exit
 fi
 
-watermark_scale=`cat /proc/sys/vm/watermark_scale_factor`
+# record the original watermark_scale_factor value
+watermark_scale=$(getprop "ro.kernel.watermark_scale_factor")
+if [ -z "$watermark_scale" ]
+then
+    watermark_scale=$(cat /proc/sys/vm/watermark_scale_factor)
+    setprop "ro.kernel.watermark_scale_factor" "$watermark_scale"
+    # On older distributions with no policies configured setprop may fail.
+    # If that happens, use the kernel default of 10.
+    if [ -z $(getprop "ro.kernel.watermark_scale_factor") ]
+    then
+        watermark_scale=10
+    fi
+fi
 
 # convert extra_free_kbytes to pages
 page_size=$(getconf PAGESIZE)
diff --git a/init/firmware_handler.cpp b/init/firmware_handler.cpp
index 30e808d..b9fa58c 100644
--- a/init/firmware_handler.cpp
+++ b/init/firmware_handler.cpp
@@ -257,12 +257,12 @@
             return false;
         }
         struct stat sb;
-        if (fstat(fw_fd, &sb) == -1) {
+        if (fstat(fw_fd.get(), &sb) == -1) {
             attempted_paths_and_errors.emplace_back("firmware: attempted " + file +
                                                     ", fstat failed: " + strerror(errno));
             return false;
         }
-        LoadFirmware(firmware, root, fw_fd, sb.st_size, loading_fd, data_fd);
+        LoadFirmware(firmware, root, fw_fd.get(), sb.st_size, loading_fd.get(), data_fd.get());
         return true;
     };
 
@@ -287,7 +287,7 @@
     }
 
     // Write "-1" as our response to the kernel's firmware request, since we have nothing for it.
-    write(loading_fd, "-1", 2);
+    write(loading_fd.get(), "-1", 2);
 }
 
 bool FirmwareHandler::ForEachFirmwareDirectory(
diff --git a/init/first_stage_init.cpp b/init/first_stage_init.cpp
index d050ed7..107e99a 100644
--- a/init/first_stage_init.cpp
+++ b/init/first_stage_init.cpp
@@ -119,19 +119,14 @@
 // Move snapuserd before switching root, so that it is available at the same path
 // after switching root.
 void PrepareSwitchRoot() {
-    constexpr const char* src = "/system/bin/snapuserd";
-    constexpr const char* dst = "/first_stage_ramdisk/system/bin/snapuserd";
+    static constexpr const auto& snapuserd = "/system/bin/snapuserd";
+    static constexpr const auto& snapuserd_ramdisk = "/system/bin/snapuserd_ramdisk";
+    static constexpr const auto& dst = "/first_stage_ramdisk/system/bin/snapuserd";
 
     if (access(dst, X_OK) == 0) {
         LOG(INFO) << dst << " already exists and it can be executed";
         return;
     }
-
-    if (access(src, F_OK) != 0) {
-        PLOG(INFO) << "Not moving " << src << " because it cannot be accessed";
-        return;
-    }
-
     auto dst_dir = android::base::Dirname(dst);
     std::error_code ec;
     if (access(dst_dir.c_str(), F_OK) != 0) {
@@ -139,7 +134,18 @@
             LOG(FATAL) << "Cannot create " << dst_dir << ": " << ec.message();
         }
     }
-    Copy(src, dst);
+
+    // prefer the generic ramdisk copy of snapuserd, because that's on system side of treble
+    // boundary, and therefore is more likely to be updated along with the Android platform.
+    // The vendor ramdisk copy might be under vendor freeze, or vendor might choose not to update
+    // it.
+    if (access(snapuserd_ramdisk, F_OK) == 0) {
+        LOG(INFO) << "Using generic ramdisk copy of snapuserd " << snapuserd_ramdisk;
+        Copy(snapuserd_ramdisk, dst);
+    } else if (access(snapuserd, F_OK) == 0) {
+        LOG(INFO) << "Using vendor ramdisk copy of snapuserd " << snapuserd;
+        Copy(snapuserd, dst);
+    }
 }
 }  // namespace
 
@@ -289,9 +295,6 @@
     // stage init
     CHECKCALL(mount("tmpfs", kSecondStageRes, "tmpfs", MS_NOEXEC | MS_NOSUID | MS_NODEV,
                     "mode=0755,uid=0,gid=0"))
-
-    // First stage init stores Mainline sepolicy here.
-    CHECKCALL(mkdir("/dev/selinux", 0744));
 #undef CHECKCALL
 
     SetStdioToDevNull(argv);
diff --git a/init/first_stage_mount.cpp b/init/first_stage_mount.cpp
index 042988e..07ce458 100644
--- a/init/first_stage_mount.cpp
+++ b/init/first_stage_mount.cpp
@@ -507,16 +507,16 @@
         SaveRamdiskPathToSnapuserd();
     }
 
-    if (MountPartition(system_partition, false /* erase_same_mounts */)) {
-        if (dsu_not_on_userdata_ && fs_mgr_verity_is_check_at_most_once(*system_partition)) {
-            LOG(ERROR) << "check_most_at_once forbidden on external media";
-            return false;
-        }
-        SwitchRoot("/system");
-    } else {
+    if (!MountPartition(system_partition, false /* erase_same_mounts */)) {
         PLOG(ERROR) << "Failed to mount /system";
         return false;
     }
+    if (dsu_not_on_userdata_ && fs_mgr_verity_is_check_at_most_once(*system_partition)) {
+        LOG(ERROR) << "check_at_most_once forbidden on external media";
+        return false;
+    }
+
+    SwitchRoot("/system");
 
     return true;
 }
@@ -651,14 +651,9 @@
         return;
     }
 
-    std::string lp_names = "";
-    std::vector<std::string> dsu_partitions;
-    for (auto&& name : images->GetAllBackingImages()) {
-        dsu_partitions.push_back(name);
-        lp_names += name + ",";
-    }
-    // Publish the logical partition names for TransformFstabForDsu
-    WriteFile(gsi::kGsiLpNamesFile, lp_names);
+    // Publish the logical partition names for TransformFstabForDsu() and ReadFstabFromFile().
+    const auto dsu_partitions = images->GetAllBackingImages();
+    WriteFile(gsi::kGsiLpNamesFile, android::base::Join(dsu_partitions, ","));
     TransformFstabForDsu(&fstab_, active_dsu, dsu_partitions);
 }
 
diff --git a/init/fuzzer/Android.bp b/init/fuzzer/Android.bp
new file mode 100644
index 0000000..c21a196
--- /dev/null
+++ b/init/fuzzer/Android.bp
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package {
+    default_applicable_licenses: ["system_core_init_license"],
+}
+
+cc_defaults {
+    name: "libinit_defaults",
+    static_libs: [
+        "libc++fs",
+        "liblmkd_utils",
+        "libmodprobe",
+        "libprotobuf-cpp-lite",
+        "libpropertyinfoparser",
+        "libsnapshot_init",
+        "libinit",
+    ],
+    shared_libs: [
+        "libbase",
+        "libfs_mgr",
+        "libhidl-gen-utils",
+        "libkeyutils",
+        "liblog",
+        "libprocessgroup",
+        "libselinux",
+    ],
+    header_libs: ["libinit_headers"],
+    fuzz_config: {
+        cc: [
+            "android-media-fuzzing-reports@google.com",
+        ],
+        componentid: 155276,
+    },
+}
+
+cc_fuzz {
+    name: "init_parser_fuzzer",
+    srcs: [
+        "init_parser_fuzzer.cpp",
+    ],
+    shared_libs: ["libhidlmetadata",],
+    defaults: [
+        "libinit_defaults",
+    ],
+}
+
+cc_fuzz {
+    name: "init_property_fuzzer",
+    srcs: [
+        "init_property_fuzzer.cpp",
+    ],
+    defaults: ["libinit_defaults"],
+}
+
+cc_fuzz {
+    name: "init_ueventHandler_fuzzer",
+    srcs: [
+        "init_ueventHandler_fuzzer.cpp",
+    ],
+    defaults: [
+        "libinit_defaults",
+    ],
+}
diff --git a/init/fuzzer/README.md b/init/fuzzer/README.md
new file mode 100644
index 0000000..fc9a6a6
--- /dev/null
+++ b/init/fuzzer/README.md
@@ -0,0 +1,98 @@
+# Fuzzers for libinit
+
+## Table of contents
++ [init_parser_fuzzer](#InitParser)
++ [init_property_fuzzer](#InitProperty)
++ [init_ueventHandler_fuzzer](#InitUeventHandler)
+
+# <a name="InitParser"></a> Fuzzer for InitParser
+
+InitParser supports the following parameters:
+1. ValidPathNames (parameter name: "kValidPaths")
+2. ValidParseInputs (parameter name: "kValidInputs")
+
+| Parameter| Valid Values| Configured Value|
+|------------- |-------------| ----- |
+|`kValidPaths`| 0.`/system/etc/init/hw/init.rc`,<br/> 1.`/system/etc/init` |Value obtained from FuzzedDataProvider|
+|`kValidInputs`| 0.`{"","cpu", "10", "10"}`,<br/> 1.`{"","RLIM_CPU", "10", "10"}`,<br/> 2.`{"","12", "unlimited", "10"}`,<br/> 3.`{"","13", "-1", "10"}`,<br/> 4.`{"","14", "10", "unlimited"}`,<br/> 5.`{"","15", "10", "-1"}` |Value obtained from FuzzedDataProvider|
+
+#### Steps to run
+1. Build the fuzzer
+```
+  $ mm -j$(nproc) init_parser_fuzzer
+```
+2. Run on device
+```
+  $ adb sync data
+  $ adb shell /data/fuzz/arm64/init_parser_fuzzer/init_parser_fuzzer
+```
+
+# <a name="InitProperty"></a> Fuzzer for InitProperty
+
+InitProperty supports the following parameters:
+  PropertyType (parameter name: "PropertyType")
+
+| Parameter| Valid Values |Configured Value|
+|-------------|----------|----- |
+|`PropertyType`| 0.`STRING`,<br/> 1.`BOOL`,<br/> 2.`INT`,<br/> 3.`UINT`,<br/> 4.`DOUBLE`,<br/> 5.`SIZE`,<br/>6.`ENUM`,<br/>7.`RANDOM`|Value obtained from FuzzedDataProvider|
+
+#### Steps to run
+1. Build the fuzzer
+```
+  $ mm -j$(nproc) init_property_fuzzer
+```
+2. Run on device
+```
+  $ adb sync data
+  $ adb shell /data/fuzz/arm64/init_property_fuzzer/init_property_fuzzer
+```
+
+# <a name="InitUeventHandler"></a> Fuzzer for InitUeventHandler
+
+##### Maximize code coverage
+The configuration parameters are not hardcoded, but instead selected based on
+incoming data. This ensures more code paths are reached by the fuzzer.
+
+InitUeventHandler supports the following parameters:
+1. Major (parameter name: `major`)
+2. Minor (parameter name: `minor`)
+3. PartitionNum (parameter name: `partition_num`)
+4. Uid (parameter name: `uid`)
+5. Gid (parameter name: `gid`)
+6. Action (parameter name: `action`)
+7. Path (parameter name: `path`)
+8. Subsystem (parameter name: `subsystem`)
+9. PartitionName (parameter name: `partition_name`)
+10. DeviceName (parameter name: `device_name`)
+11. Modalias (parameter name: `modalias`)
+12. DevPath (parameter name: `devPath`)
+13. HandlerPath (parameter name: `handlerPath`)
+
+| Parameter| Valid Values| Configured Value|
+|------------- |-------------| ----- |
+| `major` | `UINT32_MIN` to `UINT32_MAX` | Value obtained from FuzzedDataProvider|
+| `minor` | `UINT32_MIN` to `UINT32_MAX` | Value obtained from FuzzedDataProvider|
+| `partition_num ` | `UINT32_MIN` to `UINT32_MAX` | Value obtained from FuzzedDataProvider|
+| `uid` | `UINT32_MIN` to `UINT32_MAX` | Value obtained from FuzzedDataProvider|
+| `gid` | `UINT32_MIN` to `UINT32_MAX` | Value obtained from FuzzedDataProvider|
+| `action` | `String` | Value obtained from FuzzedDataProvider|
+| `path` | `String` | Value obtained from FuzzedDataProvider|
+| `subsystem` | `String` | Value obtained from FuzzedDataProvider|
+| `partition_name` | `String` | Value obtained from FuzzedDataProvider|
+| `device_name` | `String` | Value obtained from FuzzedDataProvider|
+| `modalias` | `String` | Value obtained from FuzzedDataProvider|
+| `devPath` | `String` | Value obtained from FuzzedDataProvider|
+| `handlerPath` | `String` | Value obtained from FuzzedDataProvider|
+
+This also ensures that the plugin is always deterministic for any given input.
+
+#### Steps to run
+1. Build the fuzzer
+```
+$ mm -j$(nproc) init_ueventHandler_fuzzer
+```
+2. Run on device
+```
+$ adb sync data
+$ adb shell /data/fuzz/arm64/init_ueventHandler_fuzzer/init_ueventHandler_fuzzer
+```
diff --git a/init/fuzzer/init_parser_fuzzer.cpp b/init/fuzzer/init_parser_fuzzer.cpp
new file mode 100644
index 0000000..e6a78a2
--- /dev/null
+++ b/init/fuzzer/init_parser_fuzzer.cpp
@@ -0,0 +1,146 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <fuzzer/FuzzedDataProvider.h>
+#include <hidl/metadata.h>
+#include <import_parser.h>
+#include <interface_utils.h>
+#include <rlimit_parser.h>
+
+using namespace android;
+using namespace android::init;
+
+const std::vector<std::string> kValidInputs[] = {
+        {"", "cpu", "10", "10"}, {"", "RLIM_CPU", "10", "10"},  {"", "12", "unlimited", "10"},
+        {"", "13", "-1", "10"},  {"", "14", "10", "unlimited"}, {"", "15", "10", "-1"},
+};
+
+const std::string kValidPaths[] = {
+        "/system/etc/init/hw/init.rc",
+        "/system/etc/init",
+};
+
+const int32_t kMaxBytes = 256;
+const std::string kValidInterfaces = "android.frameworks.vr.composer@2.0::IVrComposerClient";
+
+class InitParserFuzzer {
+  public:
+    InitParserFuzzer(const uint8_t* data, size_t size) : fdp_(data, size){};
+    void Process();
+
+  private:
+    void InvokeParser();
+    void InvokeLimitParser();
+    void InvokeInterfaceUtils();
+    InterfaceInheritanceHierarchyMap GenerateHierarchyMap();
+    std::vector<HidlInterfaceMetadata> GenerateInterfaceMetadata();
+
+    FuzzedDataProvider fdp_;
+};
+
+void InitParserFuzzer::InvokeLimitParser() {
+    if (fdp_.ConsumeBool()) {
+        std::vector<std::string> input;
+        input.push_back("");
+        input.push_back(fdp_.ConsumeRandomLengthString(kMaxBytes));
+        input.push_back(fdp_.ConsumeRandomLengthString(kMaxBytes));
+        input.push_back(fdp_.ConsumeRandomLengthString(kMaxBytes));
+        ParseRlimit(input);
+    } else {
+        ParseRlimit(fdp_.PickValueInArray(kValidInputs));
+    }
+}
+
+std::vector<HidlInterfaceMetadata> InitParserFuzzer::GenerateInterfaceMetadata() {
+    std::vector<HidlInterfaceMetadata> random_interface;
+    for (size_t idx = 0; idx < fdp_.ConsumeIntegral<size_t>(); ++idx) {
+        HidlInterfaceMetadata metadata;
+        metadata.name = fdp_.ConsumeRandomLengthString(kMaxBytes);
+        for (size_t idx1 = 0; idx1 < fdp_.ConsumeIntegral<size_t>(); ++idx1) {
+            metadata.inherited.push_back(fdp_.ConsumeRandomLengthString(kMaxBytes));
+        }
+        random_interface.push_back(metadata);
+    }
+    return random_interface;
+}
+
+InterfaceInheritanceHierarchyMap InitParserFuzzer::GenerateHierarchyMap() {
+    InterfaceInheritanceHierarchyMap result;
+    std::vector<HidlInterfaceMetadata> random_interface;
+    if (fdp_.ConsumeBool()) {
+        random_interface = GenerateInterfaceMetadata();
+    } else {
+        random_interface = HidlInterfaceMetadata::all();
+    }
+
+    for (const HidlInterfaceMetadata& iface : random_interface) {
+        std::set<FQName> inherited_interfaces;
+        for (const std::string& intf : iface.inherited) {
+            FQName fqname;
+            (void)fqname.setTo(intf);
+            inherited_interfaces.insert(fqname);
+        }
+        FQName fqname;
+        (void)fqname.setTo(iface.name);
+        result[fqname] = inherited_interfaces;
+    }
+    return result;
+}
+
+void InitParserFuzzer::InvokeInterfaceUtils() {
+    InterfaceInheritanceHierarchyMap hierarchy_map = GenerateHierarchyMap();
+    SetKnownInterfaces(hierarchy_map);
+    IsKnownInterface(fdp_.ConsumeRandomLengthString(kMaxBytes));
+    std::set<std::string> interface_set;
+    for (size_t idx = 0; idx < fdp_.ConsumeIntegral<size_t>(); ++idx) {
+        auto set_interface_values = fdp_.PickValueInArray<const std::function<void()>>({
+                [&]() {
+                    interface_set.insert(("aidl/" + fdp_.ConsumeRandomLengthString(kMaxBytes)));
+                },
+                [&]() { interface_set.insert(fdp_.ConsumeRandomLengthString(kMaxBytes)); },
+                [&]() { interface_set.insert(kValidInterfaces); },
+        });
+        set_interface_values();
+    }
+    CheckInterfaceInheritanceHierarchy(interface_set, hierarchy_map);
+}
+
+void InitParserFuzzer::InvokeParser() {
+    Parser parser;
+    std::string name = fdp_.ConsumeBool() ? fdp_.ConsumeRandomLengthString(kMaxBytes) : "import";
+    parser.AddSectionParser(name, std::make_unique<ImportParser>(&parser));
+    std::string path = fdp_.ConsumeBool() ? fdp_.PickValueInArray(kValidPaths)
+                                          : fdp_.ConsumeRandomLengthString(kMaxBytes);
+    parser.ParseConfig(path);
+    parser.ParseConfigFileInsecure(path);
+}
+
+void InitParserFuzzer::Process() {
+    while (fdp_.remaining_bytes()) {
+        auto invoke_parser_fuzzer = fdp_.PickValueInArray<const std::function<void()>>({
+                [&]() { InvokeParser(); },
+                [&]() { InvokeInterfaceUtils(); },
+                [&]() { InvokeLimitParser(); },
+        });
+        invoke_parser_fuzzer();
+    }
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+    InitParserFuzzer init_parser_fuzzer(data, size);
+    init_parser_fuzzer.Process();
+    return 0;
+}
diff --git a/init/fuzzer/init_property_fuzzer.cpp b/init/fuzzer/init_property_fuzzer.cpp
new file mode 100644
index 0000000..22df375
--- /dev/null
+++ b/init/fuzzer/init_property_fuzzer.cpp
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <persistent_properties.h>
+#include <property_type.h>
+#include <sys/stat.h>
+#include <fstream>
+#include "fuzzer/FuzzedDataProvider.h"
+
+using namespace android;
+using namespace android::init;
+using android::init::persistent_property_filename;
+
+const std::string kTempDir = "/data/local/tmp/";
+const std::string kFuzzerPropertyFile = kTempDir + "persistent_properties";
+constexpr int32_t kMaxPropertyLength = 10;
+const std::string kPrefix = "persist.";
+const std::string kPropertyName = kPrefix + "sys.timezone";
+const std::string kPropertyValue = "America/Los_Angeles";
+const std::string kLegacyPropertyFile = "/data/property/persist.properties";
+const std::string kSizeSuffix[3] = {"g", "k", "m"};
+constexpr int32_t kMinNumStrings = 1;
+constexpr int32_t kMaxNumStrings = 10;
+
+enum PropertyType { STRING, BOOL, INT, UINT, DOUBLE, SIZE, ENUM, RANDOM, kMaxValue = RANDOM };
+
+class InitPropertyFuzzer {
+  public:
+    InitPropertyFuzzer(const uint8_t* data, size_t size) : fdp_(data, size){};
+    void process();
+
+  private:
+    void InvokeCheckType();
+    void InvokeWritePersistentProperty();
+    void RemoveFiles();
+    void CreateFuzzerPropertyFile(const std::string property_file);
+    FuzzedDataProvider fdp_;
+};
+
+void InitPropertyFuzzer::InvokeCheckType() {
+    std::string property_type;
+    std::string value;
+    int type = fdp_.ConsumeEnum<PropertyType>();
+    switch (type) {
+        case STRING:
+            value = fdp_.ConsumeRandomLengthString(kMaxPropertyLength);
+            property_type = "string";
+            break;
+        case BOOL:
+            value = fdp_.ConsumeBool();
+            property_type = "bool";
+            break;
+        case INT:
+            value = fdp_.ConsumeIntegral<int>();
+            property_type = "int";
+            break;
+        case UINT:
+            value = fdp_.ConsumeIntegral<uint_t>();
+            property_type = "uint";
+            break;
+        case DOUBLE:
+            value = fdp_.ConsumeFloatingPoint<double>();
+            property_type = "double";
+            break;
+        case SIZE:
+            value = fdp_.ConsumeIntegral<uint_t>();
+            value = value.append(fdp_.PickValueInArray(kSizeSuffix));
+            property_type = "size";
+            break;
+        case ENUM:
+            value = fdp_.ConsumeIntegral<uint_t>();
+            property_type = "enum";
+            break;
+        case RANDOM:
+            value = fdp_.ConsumeRandomLengthString(kMaxPropertyLength);
+            property_type = fdp_.ConsumeRandomLengthString(kMaxPropertyLength);
+            break;
+    }
+
+    CheckType(property_type, value);
+}
+
+void InitPropertyFuzzer::InvokeWritePersistentProperty() {
+    if (fdp_.ConsumeBool()) {
+        WritePersistentProperty(kPropertyName, kPropertyValue);
+    } else {
+        WritePersistentProperty((kPrefix + fdp_.ConsumeRandomLengthString(kMaxPropertyLength)),
+                                fdp_.ConsumeRandomLengthString(kMaxPropertyLength));
+    }
+}
+
+void InitPropertyFuzzer::RemoveFiles() {
+    remove(kFuzzerPropertyFile.c_str());
+    remove(kLegacyPropertyFile.c_str());
+}
+
+void InitPropertyFuzzer::CreateFuzzerPropertyFile(const std::string property_file) {
+    std::ofstream out;
+    out.open(property_file, std::ios::binary | std::ofstream::trunc);
+    chmod(property_file.c_str(), S_IRWXU);
+    const int32_t numStrings = fdp_.ConsumeIntegralInRange(kMinNumStrings, kMaxNumStrings);
+    for (int32_t i = 0; i < numStrings; ++i) {
+        out << fdp_.ConsumeRandomLengthString(kMaxPropertyLength) << "\n";
+    }
+    out.close();
+}
+
+void InitPropertyFuzzer::process() {
+    persistent_property_filename = kFuzzerPropertyFile;
+    /* Property and legacy files are created using createFuzzerPropertyFile() and */
+    /* are used in the below APIs. Hence createFuzzerPropertyFile() is not a part */
+    /* of the lambda construct. */
+    CreateFuzzerPropertyFile(kFuzzerPropertyFile);
+    CreateFuzzerPropertyFile(kLegacyPropertyFile);
+    auto property_type = fdp_.PickValueInArray<const std::function<void()>>({
+            [&]() { InvokeCheckType(); },
+            [&]() { InvokeWritePersistentProperty(); },
+            [&]() { LoadPersistentProperties(); },
+    });
+    property_type();
+    RemoveFiles();
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+    InitPropertyFuzzer initPropertyFuzzer(data, size);
+    initPropertyFuzzer.process();
+    return 0;
+}
diff --git a/init/fuzzer/init_ueventHandler_fuzzer.cpp b/init/fuzzer/init_ueventHandler_fuzzer.cpp
new file mode 100644
index 0000000..b6d5f8a
--- /dev/null
+++ b/init/fuzzer/init_ueventHandler_fuzzer.cpp
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <devices.h>
+#include <firmware_handler.h>
+#include <fuzzer/FuzzedDataProvider.h>
+#include <modalias_handler.h>
+#include <sys/stat.h>
+#include <util.h>
+#include <fstream>
+
+using namespace android;
+using namespace android::init;
+constexpr int32_t kMaxBytes = 100;
+constexpr int32_t kMaxSize = 1000;
+constexpr int32_t kMinSize = 1;
+
+/*'HandleUevent' prefixes the path with '/sys' and hence this is required to point
+ * to'/data/local/tmp' dir.*/
+const std::string kPath = "/../data/local/tmp/";
+const std::string kPathPrefix = "/..";
+
+void MakeFile(FuzzedDataProvider* fdp, std::string s) {
+    std::ofstream out;
+    out.open(s, std::ios::binary | std::ofstream::trunc);
+    for (int32_t idx = 0; idx < fdp->ConsumeIntegralInRange(kMinSize, kMaxSize); ++idx) {
+        out << fdp->ConsumeRandomLengthString(kMaxBytes) << "\n";
+    }
+    out.close();
+}
+
+void CreateDir(std::string Directory, FuzzedDataProvider* fdp) {
+    std::string tmp = Directory.substr(kPathPrefix.length());
+    mkdir_recursive(android::base::Dirname(tmp.c_str()),
+                    S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
+    MakeFile(fdp, tmp + "/data");
+    MakeFile(fdp, tmp + "/loading");
+}
+
+std::string SelectRandomString(FuzzedDataProvider* fdp, std::string s) {
+    if (fdp->ConsumeBool()) {
+        if (fdp->ConsumeBool()) {
+            return fdp->ConsumeRandomLengthString(kMaxBytes);
+        } else {
+            return s;
+        }
+    }
+    return "";
+}
+
+Uevent CreateUevent(FuzzedDataProvider* fdp) {
+    Uevent uevent;
+    uevent.action = SelectRandomString(fdp, "add");
+    uevent.subsystem = SelectRandomString(fdp, "firmware");
+    uevent.path = SelectRandomString(fdp, kPath + fdp->ConsumeRandomLengthString(kMaxBytes));
+    uevent.firmware = fdp->ConsumeBool() ? fdp->ConsumeRandomLengthString(kMaxBytes) : "";
+    uevent.partition_name = fdp->ConsumeBool() ? fdp->ConsumeRandomLengthString(kMaxBytes) : "";
+    uevent.device_name = fdp->ConsumeBool() ? fdp->ConsumeRandomLengthString(kMaxBytes) : "";
+    uevent.modalias = fdp->ConsumeBool() ? fdp->ConsumeRandomLengthString(kMaxBytes) : "";
+    uevent.partition_num = fdp->ConsumeIntegral<int32_t>();
+    uevent.major = fdp->ConsumeIntegral<int32_t>();
+    uevent.minor = fdp->ConsumeIntegral<int32_t>();
+    return uevent;
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+    FuzzedDataProvider fdp(data, size);
+    while (fdp.remaining_bytes()) {
+        auto invoke_uevent_handler_fuzzer = fdp.PickValueInArray<const std::function<void()>>({
+                [&]() {
+                    std::vector<std::string> modalias_vector;
+                    for (size_t idx = 0;
+                         idx < fdp.ConsumeIntegralInRange<size_t>(kMinSize, kMaxSize); ++idx) {
+                        modalias_vector.push_back(fdp.ConsumeRandomLengthString(kMaxBytes));
+                    }
+                    ModaliasHandler modalias_handler = ModaliasHandler(modalias_vector);
+                    modalias_handler.HandleUevent(CreateUevent(&fdp));
+                },
+                [&]() {
+                    std::vector<ExternalFirmwareHandler> external_handlers;
+                    std::vector<std::string> firmware_directories;
+                    for (size_t idx = 0;
+                         idx < fdp.ConsumeIntegralInRange<size_t>(kMinSize, kMaxSize); ++idx) {
+                        std::string devPath = fdp.ConsumeRandomLengthString(kMaxBytes);
+                        uid_t uid = fdp.ConsumeIntegral<uid_t>();
+                        gid_t gid = fdp.ConsumeIntegral<gid_t>();
+                        std::string handlerPath = fdp.ConsumeRandomLengthString(kMaxBytes);
+                        ExternalFirmwareHandler externalFirmwareHandler =
+                                ExternalFirmwareHandler(devPath, uid, gid, handlerPath);
+                        external_handlers.push_back(externalFirmwareHandler);
+                        firmware_directories.push_back(fdp.ConsumeRandomLengthString(kMaxBytes));
+                    }
+                    FirmwareHandler firmware_handler =
+                            FirmwareHandler(firmware_directories, external_handlers);
+                    Uevent uevent = CreateUevent(&fdp);
+                    if (fdp.ConsumeBool() && uevent.path.size() != 0 &&
+                        uevent.path.find(kPath) == 0) {
+                        CreateDir(uevent.path, &fdp);
+                        firmware_handler.HandleUevent(uevent);
+                        std::string s = uevent.path.substr(kPathPrefix.length());
+                        remove(s.c_str());
+                    } else {
+                        firmware_handler.HandleUevent(uevent);
+                    }
+                },
+        });
+        invoke_uevent_handler_fuzzer();
+    }
+    return 0;
+}
diff --git a/init/host_init_stubs.h b/init/host_init_stubs.h
index 2a8bf6c..753ed6b 100644
--- a/init/host_init_stubs.h
+++ b/init/host_init_stubs.h
@@ -29,6 +29,9 @@
 #define __ANDROID_API_P__ 28
 #define __ANDROID_API_Q__ 29
 #define __ANDROID_API_R__ 30
+#define __ANDROID_API_S__ 31
+#define __ANDROID_API_T__ 33
+#define __ANDROID_API_U__ 34
 
 // sys/system_properties.h
 #define PROP_VALUE_MAX 92
diff --git a/init/init.cpp b/init/init.cpp
index 29f643e..4262191 100644
--- a/init/init.cpp
+++ b/init/init.cpp
@@ -51,19 +51,22 @@
 #include <android-base/properties.h>
 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
-#include <backtrace/Backtrace.h>
 #include <fs_avb/fs_avb.h>
 #include <fs_mgr_vendor_overlay.h>
 #include <keyutils.h>
 #include <libavb/libavb.h>
 #include <libgsi/libgsi.h>
 #include <libsnapshot/snapshot.h>
+#include <logwrap/logwrap.h>
 #include <processgroup/processgroup.h>
 #include <processgroup/setup.h>
 #include <selinux/android.h>
+#include <unwindstack/AndroidUnwinder.h>
 
+#include "action.h"
+#include "action_manager.h"
 #include "action_parser.h"
-#include "builtins.h"
+#include "apex_init_util.h"
 #include "epoll.h"
 #include "first_stage_init.h"
 #include "first_stage_mount.h"
@@ -81,6 +84,7 @@
 #include "selabel.h"
 #include "selinux.h"
 #include "service.h"
+#include "service_list.h"
 #include "service_parser.h"
 #include "sigchld_handler.h"
 #include "snapuserd_transition.h"
@@ -88,6 +92,10 @@
 #include "system/core/init/property_service.pb.h"
 #include "util.h"
 
+#ifndef RECOVERY
+#include "com_android_apex.h"
+#endif  // RECOVERY
+
 using namespace std::chrono_literals;
 using namespace std::string_literals;
 
@@ -256,12 +264,14 @@
 } shutdown_state;
 
 static void UnwindMainThreadStack() {
-    std::unique_ptr<Backtrace> backtrace(Backtrace::Create(BACKTRACE_CURRENT_PROCESS, 1));
-    if (!backtrace->Unwind(0)) {
-        LOG(ERROR) << __FUNCTION__ << "sys.powerctl: Failed to unwind callstack.";
+    unwindstack::AndroidLocalUnwinder unwinder;
+    unwindstack::AndroidUnwinderData data;
+    if (!unwinder.Unwind(data)) {
+        LOG(ERROR) << __FUNCTION__
+                   << "sys.powerctl: Failed to unwind callstack: " << data.GetErrorString();
     }
-    for (size_t i = 0; i < backtrace->NumFrames(); i++) {
-        LOG(ERROR) << "sys.powerctl: " << backtrace->FormatFrameData(i);
+    for (const auto& frame : data.frames) {
+        LOG(ERROR) << "sys.powerctl: " << unwinder.FormatFrame(frame);
     }
 }
 
@@ -294,13 +304,59 @@
     return parser;
 }
 
-// parser that only accepts new services
-Parser CreateServiceOnlyParser(ServiceList& service_list, bool from_apex) {
-    Parser parser;
+#ifndef RECOVERY
+template <typename T>
+struct LibXmlErrorHandler {
+    T handler_;
+    template <typename Handler>
+    LibXmlErrorHandler(Handler&& handler) : handler_(std::move(handler)) {
+        xmlSetGenericErrorFunc(nullptr, &ErrorHandler);
+    }
+    ~LibXmlErrorHandler() { xmlSetGenericErrorFunc(nullptr, nullptr); }
+    static void ErrorHandler(void*, const char* msg, ...) {
+        va_list args;
+        va_start(args, msg);
+        char* formatted;
+        if (vasprintf(&formatted, msg, args) >= 0) {
+            LOG(ERROR) << formatted;
+        }
+        free(formatted);
+        va_end(args);
+    }
+};
 
-    parser.AddSectionParser(
-            "service", std::make_unique<ServiceParser>(&service_list, GetSubcontext(), std::nullopt,
-                                                       from_apex));
+template <typename Handler>
+LibXmlErrorHandler(Handler&&) -> LibXmlErrorHandler<Handler>;
+#endif  // RECOVERY
+
+// Returns a Parser that accepts scripts from APEX modules. It supports `service` and `on`.
+Parser CreateApexConfigParser(ActionManager& action_manager, ServiceList& service_list) {
+    Parser parser;
+    auto subcontext = GetSubcontext();
+#ifndef RECOVERY
+    if (subcontext) {
+        const auto apex_info_list_file = "/apex/apex-info-list.xml";
+        auto error_handler = LibXmlErrorHandler([&](const auto& error_message) {
+            LOG(ERROR) << "Failed to read " << apex_info_list_file << ":" << error_message;
+        });
+        const auto apex_info_list = com::android::apex::readApexInfoList(apex_info_list_file);
+        if (apex_info_list.has_value()) {
+            std::vector<std::string> subcontext_apexes;
+            for (const auto& info : apex_info_list->getApexInfo()) {
+                if (info.hasPreinstalledModulePath() &&
+                    subcontext->PathMatchesSubcontext(info.getPreinstalledModulePath())) {
+                    subcontext_apexes.push_back(info.getModuleName());
+                }
+            }
+            subcontext->SetApexList(std::move(subcontext_apexes));
+        }
+    }
+#endif  // RECOVERY
+    parser.AddSectionParser("service",
+                            std::make_unique<ServiceParser>(&service_list, subcontext,
+                            std::nullopt));
+    parser.AddSectionParser("on", std::make_unique<ActionParser>(&action_manager, subcontext));
+
     return parser;
 }
 
@@ -393,6 +449,81 @@
     return {};
 }
 
+int StopServicesFromApex(const std::string& apex_name) {
+    auto services = ServiceList::GetInstance().FindServicesByApexName(apex_name);
+    if (services.empty()) {
+        LOG(INFO) << "No service found for APEX: " << apex_name;
+        return 0;
+    }
+    std::set<std::string> service_names;
+    for (const auto& service : services) {
+        service_names.emplace(service->name());
+    }
+    constexpr std::chrono::milliseconds kServiceStopTimeout = 10s;
+    int still_running = StopServicesAndLogViolations(service_names, kServiceStopTimeout,
+                        true /*SIGTERM*/);
+    // Send SIGKILL to ones that didn't terminate cleanly.
+    if (still_running > 0) {
+        still_running = StopServicesAndLogViolations(service_names, 0ms, false /*SIGKILL*/);
+    }
+    return still_running;
+}
+
+void RemoveServiceAndActionFromApex(const std::string& apex_name) {
+    // Remove services and actions that match apex name
+    ActionManager::GetInstance().RemoveActionIf([&](const std::unique_ptr<Action>& action) -> bool {
+        if (GetApexNameFromFileName(action->filename()) == apex_name) {
+            return true;
+        }
+        return false;
+    });
+    ServiceList::GetInstance().RemoveServiceIf([&](const std::unique_ptr<Service>& s) -> bool {
+        if (GetApexNameFromFileName(s->filename()) == apex_name) {
+            return true;
+        }
+        return false;
+    });
+}
+
+static Result<void> DoUnloadApex(const std::string& apex_name) {
+    if (StopServicesFromApex(apex_name) > 0) {
+        return Error() << "Unable to stop all service from " << apex_name;
+    }
+    RemoveServiceAndActionFromApex(apex_name);
+    return {};
+}
+
+static Result<void> UpdateApexLinkerConfig(const std::string& apex_name) {
+    // Do not invoke linkerconfig when there's no bin/ in the apex.
+    const std::string bin_path = "/apex/" + apex_name + "/bin";
+    if (access(bin_path.c_str(), R_OK) != 0) {
+        return {};
+    }
+    const char* linkerconfig_binary = "/apex/com.android.runtime/bin/linkerconfig";
+    const char* linkerconfig_target = "/linkerconfig";
+    const char* arguments[] = {linkerconfig_binary, "--target", linkerconfig_target, "--apex",
+                               apex_name.c_str(),   "--strict"};
+
+    if (logwrap_fork_execvp(arraysize(arguments), arguments, nullptr, false, LOG_KLOG, false,
+                            nullptr) != 0) {
+        return ErrnoError() << "failed to execute linkerconfig";
+    }
+    LOG(INFO) << "Generated linker configuration for " << apex_name;
+    return {};
+}
+
+static Result<void> DoLoadApex(const std::string& apex_name) {
+    if (auto result = ParseApexConfigs(apex_name); !result.ok()) {
+        return result.error();
+    }
+
+    if (auto result = UpdateApexLinkerConfig(apex_name); !result.ok()) {
+        return result.error();
+    }
+
+    return {};
+}
+
 enum class ControlTarget {
     SERVICE,    // function gets called for the named service
     INTERFACE,  // action gets called for every service that holds this interface
@@ -416,6 +547,17 @@
     return control_message_functions;
 }
 
+static Result<void> HandleApexControlMessage(std::string_view action, const std::string& name,
+                                             std::string_view message) {
+    if (action == "load") {
+        return DoLoadApex(name);
+    } else if (action == "unload") {
+        return DoUnloadApex(name);
+    } else {
+        return Error() << "Unknown control msg '" << message << "'";
+    }
+}
+
 static bool HandleControlMessage(std::string_view message, const std::string& name,
                                  pid_t from_pid) {
     std::string cmdline_path = StringPrintf("proc/%d/cmdline", from_pid);
@@ -427,8 +569,20 @@
         process_cmdline = "unknown process";
     }
 
-    Service* service = nullptr;
     auto action = message;
+    if (ConsumePrefix(&action, "apex_")) {
+        if (auto result = HandleApexControlMessage(action, name, message); !result.ok()) {
+            LOG(ERROR) << "Control message: Could not ctl." << message << " for '" << name
+                       << "' from pid: " << from_pid << " (" << process_cmdline
+                       << "): " << result.error();
+            return false;
+        }
+        LOG(INFO) << "Control message: Processed ctl." << message << " for '" << name
+                  << "' from pid: " << from_pid << " (" << process_cmdline << ")";
+        return true;
+    }
+
+    Service* service = nullptr;
     if (ConsumePrefix(&action, "interface_")) {
         service = ServiceList::GetInstance().FindInterface(name);
     } else {
@@ -508,6 +662,10 @@
 }
 
 static Result<void> SetupCgroupsAction(const BuiltinArguments&) {
+    if (!CgroupsAvailable()) {
+        LOG(INFO) << "Cgroups support in kernel is not enabled";
+        return {};
+    }
     // Have to create <CGROUPS_RC_DIR> using make_dir function
     // for appropriate sepolicy to be set for it
     make_dir(android::base::Dirname(CGROUPS_RC_PATH), 0711);
@@ -581,30 +739,13 @@
     HandlePowerctlMessage("shutdown,container");
 }
 
-static constexpr std::chrono::milliseconds kDiagnosticTimeout = 10s;
-
-static void HandleSignalFd(bool one_off) {
+static void HandleSignalFd() {
     signalfd_siginfo siginfo;
-    auto started = std::chrono::steady_clock::now();
-    do {
-        ssize_t bytes_read = TEMP_FAILURE_RETRY(read(signal_fd, &siginfo, sizeof(siginfo)));
-        if (bytes_read < 0 && errno == EAGAIN) {
-            auto now = std::chrono::steady_clock::now();
-            std::chrono::duration<double> waited = now - started;
-            if (waited >= kDiagnosticTimeout) {
-                LOG(ERROR) << "epoll() woke us up, but we waited with no SIGCHLD!";
-                started = now;
-            }
-
-            std::this_thread::sleep_for(100ms);
-            continue;
-        }
-        if (bytes_read != sizeof(siginfo)) {
-            PLOG(ERROR) << "Failed to read siginfo from signal_fd";
-            return;
-        }
-        break;
-    } while (!one_off);
+    ssize_t bytes_read = TEMP_FAILURE_RETRY(read(signal_fd, &siginfo, sizeof(siginfo)));
+    if (bytes_read != sizeof(siginfo)) {
+        PLOG(ERROR) << "Failed to read siginfo from signal_fd";
+        return;
+    }
 
     switch (siginfo.ssi_signo) {
         case SIGCHLD:
@@ -614,7 +755,7 @@
             HandleSigtermSignal(siginfo);
             break;
         default:
-            PLOG(ERROR) << "signal_fd: received unexpected signal " << siginfo.ssi_signo;
+            LOG(ERROR) << "signal_fd: received unexpected signal " << siginfo.ssi_signo;
             break;
     }
 }
@@ -659,14 +800,13 @@
         LOG(FATAL) << "Failed to register a fork handler: " << strerror(result);
     }
 
-    signal_fd = signalfd(-1, &mask, SFD_CLOEXEC | SFD_NONBLOCK);
+    signal_fd = signalfd(-1, &mask, SFD_CLOEXEC);
     if (signal_fd == -1) {
         PLOG(FATAL) << "failed to create signalfd";
     }
 
     constexpr int flags = EPOLLIN | EPOLLPRI;
-    auto handler = std::bind(HandleSignalFd, false);
-    if (auto result = epoll->RegisterHandler(signal_fd, handler, flags); !result.ok()) {
+    if (auto result = epoll->RegisterHandler(signal_fd, HandleSignalFd, flags); !result.ok()) {
         LOG(FATAL) << result.error();
     }
 }
@@ -795,32 +935,6 @@
     return {};
 }
 
-static void DumpPidFds(const std::string& prefix, pid_t pid) {
-    std::error_code ec;
-    std::string proc_dir = "/proc/" + std::to_string(pid) + "/fd";
-    for (const auto& entry : std::filesystem::directory_iterator(proc_dir)) {
-        std::string target;
-        if (android::base::Readlink(entry.path(), &target)) {
-            LOG(ERROR) << prefix << target;
-        } else {
-            LOG(ERROR) << prefix << entry.path();
-        }
-    }
-}
-
-static void DumpFile(const std::string& prefix, const std::string& file) {
-    std::ifstream fp(file);
-    if (!fp) {
-        LOG(ERROR) << "Could not open " << file;
-        return;
-    }
-
-    std::string line;
-    while (std::getline(fp, line)) {
-        LOG(ERROR) << prefix << line;
-    }
-}
-
 int SecondStageMain(int argc, char** argv) {
     if (REBOOT_BOOTLOADER_ON_PANIC) {
         InstallRebootSignalHandlers();
@@ -907,6 +1021,11 @@
         PLOG(FATAL) << result.error();
     }
 
+    // We always reap children before responding to the other pending functions. This is to
+    // prevent a race where other daemons see that a service has exited and ask init to
+    // start it again via ctl.start before init has reaped it.
+    epoll.SetFirstCallback(ReapAnyOutstandingChildren);
+
     InstallSignalFdHandler(&epoll);
     InstallInitNotifier(&epoll);
     StartPropertyService(&property_fd);
@@ -989,7 +1108,7 @@
     setpriority(PRIO_PROCESS, 0, 0);
     while (true) {
         // By default, sleep until something happens.
-        auto epoll_timeout = std::optional<std::chrono::milliseconds>{kDiagnosticTimeout};
+        std::optional<std::chrono::milliseconds> epoll_timeout;
 
         auto shutdown_command = shutdown_state.CheckShutdown();
         if (shutdown_command) {
@@ -1009,7 +1128,7 @@
             if (next_process_action_time) {
                 epoll_timeout = std::chrono::ceil<std::chrono::milliseconds>(
                         *next_process_action_time - boot_clock::now());
-                if (*epoll_timeout < 0ms) epoll_timeout = 0ms;
+                if (epoll_timeout < 0ms) epoll_timeout = 0ms;
             }
         }
 
@@ -1018,36 +1137,9 @@
             if (am.HasMoreCommands()) epoll_timeout = 0ms;
         }
 
-        auto pending_functions = epoll.Wait(epoll_timeout);
-        if (!pending_functions.ok()) {
-            LOG(ERROR) << pending_functions.error();
-        } else if (!pending_functions->empty()) {
-            // We always reap children before responding to the other pending functions. This is to
-            // prevent a race where other daemons see that a service has exited and ask init to
-            // start it again via ctl.start before init has reaped it.
-            ReapAnyOutstandingChildren();
-            for (const auto& function : *pending_functions) {
-                (*function)();
-            }
-        } else if (Service::is_exec_service_running()) {
-            static bool dumped_diagnostics = false;
-            std::chrono::duration<double> waited =
-                    std::chrono::steady_clock::now() - Service::exec_service_started();
-            if (waited >= kDiagnosticTimeout) {
-                LOG(ERROR) << "Exec service is hung? Waited " << waited.count()
-                           << " without SIGCHLD";
-                if (!dumped_diagnostics) {
-                    DumpPidFds("exec service opened: ", Service::exec_service_pid());
-
-                    std::string status_file =
-                            "/proc/" + std::to_string(Service::exec_service_pid()) + "/status";
-                    DumpFile("exec service: ", status_file);
-                    dumped_diagnostics = true;
-
-                    LOG(INFO) << "Attempting to handle any stuck SIGCHLDs...";
-                    HandleSignalFd(true);
-                }
-            }
+        auto epoll_result = epoll.Wait(epoll_timeout);
+        if (!epoll_result.ok()) {
+            LOG(ERROR) << epoll_result.error();
         }
         if (!IsShuttingDown()) {
             HandleControlMessages();
diff --git a/init/init.h b/init/init.h
index 4f686cb..063632a 100644
--- a/init/init.h
+++ b/init/init.h
@@ -29,7 +29,7 @@
 namespace init {
 
 Parser CreateParser(ActionManager& action_manager, ServiceList& service_list);
-Parser CreateServiceOnlyParser(ServiceList& service_list, bool from_apex);
+Parser CreateApexConfigParser(ActionManager& action_manager, ServiceList& service_list);
 
 bool start_waiting_for_property(const char *name, const char *value);
 
@@ -46,5 +46,9 @@
 
 int SecondStageMain(int argc, char** argv);
 
+int StopServicesFromApex(const std::string& apex_name);
+
+void RemoveServiceAndActionFromApex(const std::string& apex_name);
+
 }  // namespace init
 }  // namespace android
diff --git a/init/init_test.cpp b/init/init_test.cpp
index 8550ec8..18a08c7 100644
--- a/init/init_test.cpp
+++ b/init/init_test.cpp
@@ -15,11 +15,14 @@
  */
 
 #include <functional>
+#include <string_view>
+#include <type_traits>
 
 #include <android-base/file.h>
 #include <android-base/logging.h>
 #include <android-base/properties.h>
 #include <gtest/gtest.h>
+#include <selinux/selinux.h>
 
 #include "action.h"
 #include "action_manager.h"
@@ -27,6 +30,7 @@
 #include "builtin_arguments.h"
 #include "builtins.h"
 #include "import_parser.h"
+#include "init.h"
 #include "keyword_map.h"
 #include "parser.h"
 #include "service.h"
@@ -35,6 +39,11 @@
 #include "util.h"
 
 using android::base::GetIntProperty;
+using android::base::GetProperty;
+using android::base::SetProperty;
+using android::base::StringReplace;
+using android::base::WaitForProperty;
+using namespace std::literals;
 
 namespace android {
 namespace init {
@@ -42,34 +51,34 @@
 using ActionManagerCommand = std::function<void(ActionManager&)>;
 
 void TestInit(const std::string& init_script_file, const BuiltinFunctionMap& test_function_map,
-              const std::vector<ActionManagerCommand>& commands, ServiceList* service_list) {
-    ActionManager am;
-
+              const std::vector<ActionManagerCommand>& commands, ActionManager* action_manager,
+              ServiceList* service_list) {
     Action::set_function_map(&test_function_map);
 
     Parser parser;
     parser.AddSectionParser("service",
                             std::make_unique<ServiceParser>(service_list, nullptr, std::nullopt));
-    parser.AddSectionParser("on", std::make_unique<ActionParser>(&am, nullptr));
+    parser.AddSectionParser("on", std::make_unique<ActionParser>(action_manager, nullptr));
     parser.AddSectionParser("import", std::make_unique<ImportParser>(&parser));
 
     ASSERT_TRUE(parser.ParseConfig(init_script_file));
 
     for (const auto& command : commands) {
-        command(am);
+        command(*action_manager);
     }
 
-    while (am.HasMoreCommands()) {
-        am.ExecuteOneCommand();
+    while (action_manager->HasMoreCommands()) {
+        action_manager->ExecuteOneCommand();
     }
 }
 
 void TestInitText(const std::string& init_script, const BuiltinFunctionMap& test_function_map,
-                  const std::vector<ActionManagerCommand>& commands, ServiceList* service_list) {
+                  const std::vector<ActionManagerCommand>& commands, ActionManager* action_manager,
+                  ServiceList* service_list) {
     TemporaryFile tf;
     ASSERT_TRUE(tf.fd != -1);
     ASSERT_TRUE(android::base::WriteStringToFd(init_script, tf.fd));
-    TestInit(tf.path, test_function_map, commands, service_list);
+    TestInit(tf.path, test_function_map, commands, action_manager, service_list);
 }
 
 TEST(init, SimpleEventTrigger) {
@@ -91,8 +100,9 @@
     ActionManagerCommand trigger_boot = [](ActionManager& am) { am.QueueEventTrigger("boot"); };
     std::vector<ActionManagerCommand> commands{trigger_boot};
 
+    ActionManager action_manager;
     ServiceList service_list;
-    TestInitText(init_script, test_function_map, commands, &service_list);
+    TestInitText(init_script, test_function_map, commands, &action_manager, &service_list);
 
     EXPECT_TRUE(expect_true);
 }
@@ -154,8 +164,10 @@
     ActionManagerCommand trigger_boot = [](ActionManager& am) { am.QueueEventTrigger("boot"); };
     std::vector<ActionManagerCommand> commands{trigger_boot};
 
+    ActionManager action_manager;
     ServiceList service_list;
-    TestInitText(init_script, test_function_map, commands, &service_list);
+    TestInitText(init_script, test_function_map, commands, &action_manager, &service_list);
+    EXPECT_EQ(3, num_executed);
 }
 
 TEST(init, OverrideService) {
@@ -169,8 +181,9 @@
 
 )init";
 
+    ActionManager action_manager;
     ServiceList service_list;
-    TestInitText(init_script, BuiltinFunctionMap(), {}, &service_list);
+    TestInitText(init_script, BuiltinFunctionMap(), {}, &action_manager, &service_list);
     ASSERT_EQ(1, std::distance(service_list.begin(), service_list.end()));
 
     auto service = service_list.begin()->get();
@@ -180,6 +193,263 @@
     EXPECT_TRUE(service->is_override());
 }
 
+TEST(init, StartConsole) {
+    if (GetProperty("ro.build.type", "") == "user") {
+        GTEST_SKIP() << "Must run on userdebug/eng builds. b/262090304";
+        return;
+    }
+    std::string init_script = R"init(
+service console /system/bin/sh
+    class core
+    console null
+    disabled
+    user root
+    group root shell log readproc
+    seclabel u:r:shell:s0
+    setenv HOSTNAME console
+)init";
+
+    ActionManager action_manager;
+    ServiceList service_list;
+    TestInitText(init_script, BuiltinFunctionMap(), {}, &action_manager, &service_list);
+    ASSERT_EQ(std::distance(service_list.begin(), service_list.end()), 1);
+
+    auto service = service_list.begin()->get();
+    ASSERT_NE(service, nullptr);
+    ASSERT_RESULT_OK(service->Start());
+    const pid_t pid = service->pid();
+    ASSERT_GT(pid, 0);
+    EXPECT_NE(getsid(pid), 0);
+    service->Stop();
+}
+
+static std::string GetSecurityContext() {
+    char* ctx;
+    if (getcon(&ctx) == -1) {
+        ADD_FAILURE() << "Failed to call getcon : " << strerror(errno);
+    }
+    std::string result = std::string(ctx);
+    freecon(ctx);
+    return result;
+}
+
+void TestStartApexServices(const std::vector<std::string>& service_names,
+        const std::string& apex_name) {
+    for (auto const& svc : service_names) {
+        auto service = ServiceList::GetInstance().FindService(svc);
+        ASSERT_NE(nullptr, service);
+        ASSERT_RESULT_OK(service->Start());
+        ASSERT_TRUE(service->IsRunning());
+        LOG(INFO) << "Service " << svc << " is running";
+        if (!apex_name.empty()) {
+            service->set_filename("/apex/" + apex_name + "/init_test.rc");
+        } else {
+            service->set_filename("");
+        }
+    }
+    if (!apex_name.empty()) {
+        auto apex_services = ServiceList::GetInstance().FindServicesByApexName(apex_name);
+        EXPECT_EQ(service_names.size(), apex_services.size());
+    }
+}
+
+void TestStopApexServices(const std::vector<std::string>& service_names, bool expect_to_run) {
+    for (auto const& svc : service_names) {
+        auto service = ServiceList::GetInstance().FindService(svc);
+        ASSERT_NE(nullptr, service);
+        EXPECT_EQ(expect_to_run, service->IsRunning());
+    }
+}
+
+void TestRemoveApexService(const std::vector<std::string>& service_names, bool exist) {
+    for (auto const& svc : service_names) {
+        auto service = ServiceList::GetInstance().FindService(svc);
+        ASSERT_EQ(exist, service != nullptr);
+    }
+}
+
+void InitApexService(const std::string_view& init_template) {
+    std::string init_script = StringReplace(init_template, "$selabel",
+                                    GetSecurityContext(), true);
+
+    TestInitText(init_script, BuiltinFunctionMap(), {}, &ActionManager::GetInstance(),
+            &ServiceList::GetInstance());
+}
+
+void CleanupApexServices() {
+    std::vector<std::string> names;
+    for (const auto& s : ServiceList::GetInstance()) {
+        names.push_back(s->name());
+    }
+
+    for (const auto& name : names) {
+        auto s = ServiceList::GetInstance().FindService(name);
+        auto pid = s->pid();
+        ServiceList::GetInstance().RemoveService(*s);
+        if (pid > 0) {
+            kill(pid, SIGTERM);
+            kill(pid, SIGKILL);
+        }
+    }
+
+    ActionManager::GetInstance().RemoveActionIf([&](const std::unique_ptr<Action>& s) -> bool {
+        return true;
+    });
+}
+
+void TestApexServicesInit(const std::vector<std::string>& apex_services,
+            const std::vector<std::string>& other_apex_services,
+            const std::vector<std::string> non_apex_services) {
+    auto num_svc = apex_services.size() + other_apex_services.size() + non_apex_services.size();
+    ASSERT_EQ(num_svc, ServiceList::GetInstance().size());
+
+    TestStartApexServices(apex_services, "com.android.apex.test_service");
+    TestStartApexServices(other_apex_services, "com.android.other_apex.test_service");
+    TestStartApexServices(non_apex_services, /*apex_anme=*/ "");
+
+    StopServicesFromApex("com.android.apex.test_service");
+    TestStopApexServices(apex_services, /*expect_to_run=*/ false);
+    TestStopApexServices(other_apex_services, /*expect_to_run=*/ true);
+    TestStopApexServices(non_apex_services, /*expect_to_run=*/ true);
+
+    RemoveServiceAndActionFromApex("com.android.apex.test_service");
+    ASSERT_EQ(other_apex_services.size() + non_apex_services.size(),
+        ServiceList::GetInstance().size());
+
+    // TODO(b/244232142): Add test to check if actions are removed
+    TestRemoveApexService(apex_services, /*exist*/ false);
+    TestRemoveApexService(other_apex_services, /*exist*/ true);
+    TestRemoveApexService(non_apex_services, /*exist*/ true);
+
+    CleanupApexServices();
+}
+
+TEST(init, StopServiceByApexName) {
+    if (getuid() != 0) {
+        GTEST_SKIP() << "Must be run as root.";
+        return;
+    }
+    std::string_view script_template = R"init(
+service apex_test_service /system/bin/yes
+    user shell
+    group shell
+    seclabel $selabel
+)init";
+    InitApexService(script_template);
+    TestApexServicesInit({"apex_test_service"}, {}, {});
+}
+
+TEST(init, StopMultipleServicesByApexName) {
+    if (getuid() != 0) {
+        GTEST_SKIP() << "Must be run as root.";
+        return;
+    }
+    std::string_view script_template = R"init(
+service apex_test_service_multiple_a /system/bin/yes
+    user shell
+    group shell
+    seclabel $selabel
+service apex_test_service_multiple_b /system/bin/id
+    user shell
+    group shell
+    seclabel $selabel
+)init";
+    InitApexService(script_template);
+    TestApexServicesInit({"apex_test_service_multiple_a",
+            "apex_test_service_multiple_b"}, {}, {});
+}
+
+TEST(init, StopServicesFromMultipleApexes) {
+    if (getuid() != 0) {
+        GTEST_SKIP() << "Must be run as root.";
+        return;
+    }
+    std::string_view apex_script_template = R"init(
+service apex_test_service_multi_apex_a /system/bin/yes
+    user shell
+    group shell
+    seclabel $selabel
+service apex_test_service_multi_apex_b /system/bin/id
+    user shell
+    group shell
+    seclabel $selabel
+)init";
+    InitApexService(apex_script_template);
+
+    std::string_view other_apex_script_template = R"init(
+service apex_test_service_multi_apex_c /system/bin/yes
+    user shell
+    group shell
+    seclabel $selabel
+)init";
+    InitApexService(other_apex_script_template);
+
+    TestApexServicesInit({"apex_test_service_multi_apex_a",
+            "apex_test_service_multi_apex_b"}, {"apex_test_service_multi_apex_c"}, {});
+}
+
+TEST(init, StopServicesFromApexAndNonApex) {
+    if (getuid() != 0) {
+        GTEST_SKIP() << "Must be run as root.";
+        return;
+    }
+    std::string_view apex_script_template = R"init(
+service apex_test_service_apex_a /system/bin/yes
+    user shell
+    group shell
+    seclabel $selabel
+service apex_test_service_apex_b /system/bin/id
+    user shell
+    group shell
+    seclabel $selabel
+)init";
+    InitApexService(apex_script_template);
+
+    std::string_view non_apex_script_template = R"init(
+service apex_test_service_non_apex /system/bin/yes
+    user shell
+    group shell
+    seclabel $selabel
+)init";
+    InitApexService(non_apex_script_template);
+
+    TestApexServicesInit({"apex_test_service_apex_a",
+            "apex_test_service_apex_b"}, {}, {"apex_test_service_non_apex"});
+}
+
+TEST(init, StopServicesFromApexMixed) {
+    if (getuid() != 0) {
+        GTEST_SKIP() << "Must be run as root.";
+        return;
+    }
+    std::string_view script_template = R"init(
+service apex_test_service_mixed_a /system/bin/yes
+    user shell
+    group shell
+    seclabel $selabel
+)init";
+    InitApexService(script_template);
+
+    std::string_view other_apex_script_template = R"init(
+service apex_test_service_mixed_b /system/bin/yes
+    user shell
+    group shell
+    seclabel $selabel
+)init";
+    InitApexService(other_apex_script_template);
+
+    std::string_view non_apex_script_template = R"init(
+service apex_test_service_mixed_c /system/bin/yes
+    user shell
+    group shell
+    seclabel $selabel
+)init";
+    InitApexService(non_apex_script_template);
+
+    TestApexServicesInit({"apex_test_service_mixed_a"},
+            {"apex_test_service_mixed_b"}, {"apex_test_service_mixed_c"});
+}
+
 TEST(init, EventTriggerOrderMultipleFiles) {
     // 6 total files, which should have their triggers executed in the following order:
     // 1: start - original script parsed
@@ -236,13 +506,100 @@
     ActionManagerCommand trigger_boot = [](ActionManager& am) { am.QueueEventTrigger("boot"); };
     std::vector<ActionManagerCommand> commands{trigger_boot};
 
+    ActionManager action_manager;
     ServiceList service_list;
-
-    TestInit(start.path, test_function_map, commands, &service_list);
+    TestInit(start.path, test_function_map, commands, &action_manager, &service_list);
 
     EXPECT_EQ(6, num_executed);
 }
 
+BuiltinFunctionMap GetTestFunctionMapForLazyLoad(int& num_executed, ActionManager& action_manager) {
+    auto execute_command = [&num_executed](const BuiltinArguments& args) {
+        EXPECT_EQ(2U, args.size());
+        EXPECT_EQ(++num_executed, std::stoi(args[1]));
+        return Result<void>{};
+    };
+    auto load_command = [&action_manager](const BuiltinArguments& args) -> Result<void> {
+        EXPECT_EQ(2U, args.size());
+        Parser parser;
+        parser.AddSectionParser("on", std::make_unique<ActionParser>(&action_manager, nullptr));
+        if (!parser.ParseConfig(args[1])) {
+            return Error() << "Failed to load";
+        }
+        return Result<void>{};
+    };
+    auto trigger_command = [&action_manager](const BuiltinArguments& args) {
+        EXPECT_EQ(2U, args.size());
+        LOG(INFO) << "Queue event trigger: " << args[1];
+        action_manager.QueueEventTrigger(args[1]);
+        return Result<void>{};
+    };
+    BuiltinFunctionMap test_function_map = {
+            {"execute", {1, 1, {false, execute_command}}},
+            {"load", {1, 1, {false, load_command}}},
+            {"trigger", {1, 1, {false, trigger_command}}},
+    };
+    return test_function_map;
+}
+
+TEST(init, LazilyLoadedActionsCantBeTriggeredByTheSameTrigger) {
+    // "start" script loads "lazy" script. Even though "lazy" scripts
+    // defines "on boot" action, it's not executed by the current "boot"
+    // event because it's already processed.
+    TemporaryFile lazy;
+    ASSERT_TRUE(lazy.fd != -1);
+    ASSERT_TRUE(android::base::WriteStringToFd("on boot\nexecute 2", lazy.fd));
+
+    TemporaryFile start;
+    // clang-format off
+    std::string start_script = "on boot\n"
+                               "load " + std::string(lazy.path) + "\n"
+                               "execute 1";
+    // clang-format on
+    ASSERT_TRUE(android::base::WriteStringToFd(start_script, start.fd));
+
+    int num_executed = 0;
+    ActionManager action_manager;
+    ServiceList service_list;
+    BuiltinFunctionMap test_function_map =
+            GetTestFunctionMapForLazyLoad(num_executed, action_manager);
+
+    ActionManagerCommand trigger_boot = [](ActionManager& am) { am.QueueEventTrigger("boot"); };
+    std::vector<ActionManagerCommand> commands{trigger_boot};
+    TestInit(start.path, test_function_map, commands, &action_manager, &service_list);
+
+    EXPECT_EQ(1, num_executed);
+}
+
+TEST(init, LazilyLoadedActionsCanBeTriggeredByTheNextTrigger) {
+    // "start" script loads "lazy" script and then triggers "next" event
+    // which executes "on next" action loaded by the previous command.
+    TemporaryFile lazy;
+    ASSERT_TRUE(lazy.fd != -1);
+    ASSERT_TRUE(android::base::WriteStringToFd("on next\nexecute 2", lazy.fd));
+
+    TemporaryFile start;
+    // clang-format off
+    std::string start_script = "on boot\n"
+                               "load " + std::string(lazy.path) + "\n"
+                               "execute 1\n"
+                               "trigger next";
+    // clang-format on
+    ASSERT_TRUE(android::base::WriteStringToFd(start_script, start.fd));
+
+    int num_executed = 0;
+    ActionManager action_manager;
+    ServiceList service_list;
+    BuiltinFunctionMap test_function_map =
+            GetTestFunctionMapForLazyLoad(num_executed, action_manager);
+
+    ActionManagerCommand trigger_boot = [](ActionManager& am) { am.QueueEventTrigger("boot"); };
+    std::vector<ActionManagerCommand> commands{trigger_boot};
+    TestInit(start.path, test_function_map, commands, &action_manager, &service_list);
+
+    EXPECT_EQ(2, num_executed);
+}
+
 TEST(init, RejectsCriticalAndOneshotService) {
     if (GetIntProperty("ro.product.first_api_level", 10000) < 30) {
         GTEST_SKIP() << "Test only valid for devices launching with R or later";
diff --git a/init/interprocess_fifo.cpp b/init/interprocess_fifo.cpp
new file mode 100644
index 0000000..6e0d031
--- /dev/null
+++ b/init/interprocess_fifo.cpp
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "interprocess_fifo.h"
+
+#include <android-base/logging.h>
+
+#include <unistd.h>
+
+using ::android::base::ErrnoError;
+using ::android::base::Error;
+using ::android::base::Result;
+
+namespace android {
+namespace init {
+
+InterprocessFifo::InterprocessFifo() noexcept : fds_({-1, -1}) {}
+
+InterprocessFifo::InterprocessFifo(InterprocessFifo&& orig) noexcept : fds_({-1, -1}) {
+    std::swap(fds_, orig.fds_);
+}
+
+InterprocessFifo::~InterprocessFifo() noexcept {
+    Close();
+}
+
+void InterprocessFifo::CloseFd(int& fd) noexcept {
+    if (fd >= 0) {
+        close(fd);
+        fd = -1;
+    }
+}
+
+void InterprocessFifo::CloseReadFd() noexcept {
+    CloseFd(fds_[0]);
+}
+
+void InterprocessFifo::CloseWriteFd() noexcept {
+    CloseFd(fds_[1]);
+}
+
+void InterprocessFifo::Close() noexcept {
+    CloseReadFd();
+    CloseWriteFd();
+}
+
+Result<void> InterprocessFifo::Initialize() noexcept {
+    if (fds_[0] >= 0) {
+        return Error() << "already initialized";
+    }
+    if (pipe(fds_.data()) < 0) {  // NOLINT(android-cloexec-pipe)
+        return ErrnoError() << "pipe()";
+    }
+    return {};
+}
+
+Result<uint8_t> InterprocessFifo::Read() noexcept {
+    uint8_t byte;
+    ssize_t count = read(fds_[0], &byte, 1);
+    if (count < 0) {
+        return ErrnoError() << "read()";
+    }
+    if (count == 0) {
+        return Error() << "read() EOF";
+    }
+    DCHECK_EQ(count, 1);
+    return byte;
+}
+
+Result<void> InterprocessFifo::Write(uint8_t byte) noexcept {
+    ssize_t written = write(fds_[1], &byte, 1);
+    if (written < 0) {
+        return ErrnoError() << "write()";
+    }
+    if (written == 0) {
+        return Error() << "write() EOF";
+    }
+    DCHECK_EQ(written, 1);
+    return {};
+}
+
+}  // namespace init
+}  // namespace android
diff --git a/init/interprocess_fifo.h b/init/interprocess_fifo.h
new file mode 100644
index 0000000..cdaac86
--- /dev/null
+++ b/init/interprocess_fifo.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <array>
+
+#include <android-base/result.h>
+
+namespace android {
+namespace init {
+
+// A FIFO for inter-process communication that uses a Unix pipe internally.
+class InterprocessFifo {
+  public:
+    template <typename T>
+    using Result = ::android::base::Result<T>;
+
+    InterprocessFifo() noexcept;
+    InterprocessFifo(const InterprocessFifo& orig) noexcept = delete;
+    InterprocessFifo(InterprocessFifo&& orig) noexcept;
+    InterprocessFifo& operator=(const InterprocessFifo& orig) noexcept = delete;
+    InterprocessFifo& operator=(InterprocessFifo&& orig) noexcept = delete;
+    ~InterprocessFifo() noexcept;
+    void CloseReadFd() noexcept;
+    void CloseWriteFd() noexcept;
+    void Close() noexcept;
+    Result<void> Initialize() noexcept;
+    Result<void> Write(uint8_t byte) noexcept;
+    Result<uint8_t> Read() noexcept;
+
+  private:
+    static void CloseFd(int& fd) noexcept;
+
+    std::array<int, 2> fds_;
+};
+
+}  // namespace init
+}  // namespace android
diff --git a/init/interprocess_fifo_test.cpp b/init/interprocess_fifo_test.cpp
new file mode 100644
index 0000000..81cfbac
--- /dev/null
+++ b/init/interprocess_fifo_test.cpp
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "interprocess_fifo.h"
+
+#include <android-base/result-gmock.h>
+#include <gtest/gtest.h>
+
+#define ASSERT_OK(e) ASSERT_THAT(e, Ok())
+#define ASSERT_NOT_OK(e) ASSERT_THAT(e, Not(Ok()))
+
+using ::android::base::Result;
+using ::android::base::testing::Ok;
+using ::testing::Not;
+
+namespace android {
+namespace init {
+
+TEST(FifoTest, WriteAndRead) {
+    InterprocessFifo fifo;
+    ASSERT_OK(fifo.Initialize());
+    ASSERT_OK(fifo.Write('a'));
+    ASSERT_OK(fifo.Write('b'));
+    Result<uint8_t> result = fifo.Read();
+    ASSERT_OK(result);
+    EXPECT_EQ(*result, 'a');
+    result = fifo.Read();
+    ASSERT_OK(result);
+    EXPECT_EQ(*result, 'b');
+    InterprocessFifo fifo2 = std::move(fifo);
+    ASSERT_NOT_OK(fifo.Write('c'));
+    ASSERT_NOT_OK(fifo.Read());
+    ASSERT_OK(fifo2.Write('d'));
+    result = fifo2.Read();
+    ASSERT_OK(result);
+    EXPECT_EQ(*result, 'd');
+}
+
+}  // namespace init
+}  // namespace android
diff --git a/init/keychords_test.cpp b/init/keychords_test.cpp
index 8a333a2..5789bf5 100644
--- a/init/keychords_test.cpp
+++ b/init/keychords_test.cpp
@@ -212,11 +212,8 @@
 }
 
 void TestFrame::RelaxForMs(std::chrono::milliseconds wait) {
-    auto pending_functions = epoll_.Wait(wait);
-    ASSERT_RESULT_OK(pending_functions);
-    for (const auto& function : *pending_functions) {
-        (*function)();
-    }
+    auto epoll_result = epoll_.Wait(wait);
+    ASSERT_RESULT_OK(epoll_result);
 }
 
 void TestFrame::SetChord(int key, bool value) {
diff --git a/init/mount_namespace.cpp b/init/mount_namespace.cpp
index bce1cc3..fead371 100644
--- a/init/mount_namespace.cpp
+++ b/init/mount_namespace.cpp
@@ -190,15 +190,33 @@
     return success;
 }
 
+// Switch the mount namespace of the current process from bootstrap to default OR from default to
+// bootstrap. If the current mount namespace is neither bootstrap nor default, keep it that way.
 Result<void> SwitchToMountNamespaceIfNeeded(MountNamespace target_mount_namespace) {
     if (IsRecoveryMode() || !IsApexUpdatable()) {
         // we don't have multiple namespaces in recovery mode or if apex is not updatable
         return {};
     }
-    const auto& ns_id = target_mount_namespace == NS_BOOTSTRAP ? bootstrap_ns_id : default_ns_id;
+
+    const std::string current_namespace_id = GetMountNamespaceId();
+    MountNamespace current_mount_namespace;
+    if (current_namespace_id == bootstrap_ns_id) {
+        current_mount_namespace = NS_BOOTSTRAP;
+    } else if (current_namespace_id == default_ns_id) {
+        current_mount_namespace = NS_DEFAULT;
+    } else {
+        // services with `namespace mnt` start in its own mount namespace. So we need to keep it.
+        return {};
+    }
+
+    // We're already in the target mount namespace.
+    if (current_mount_namespace == target_mount_namespace) {
+        return {};
+    }
+
     const auto& ns_fd = target_mount_namespace == NS_BOOTSTRAP ? bootstrap_ns_fd : default_ns_fd;
     const auto& ns_name = target_mount_namespace == NS_BOOTSTRAP ? "bootstrap" : "default";
-    if (ns_id != GetMountNamespaceId() && ns_fd.get() != -1) {
+    if (ns_fd.get() != -1) {
         if (setns(ns_fd.get(), CLONE_NEWNS) == -1) {
             return ErrnoError() << "Failed to switch to " << ns_name << " mount namespace.";
         }
diff --git a/init/parser.cpp b/init/parser.cpp
index abc2017..0a388db 100644
--- a/init/parser.cpp
+++ b/init/parser.cpp
@@ -156,58 +156,6 @@
     return true;
 }
 
-std::vector<std::string> Parser::FilterVersionedConfigs(const std::vector<std::string>& configs,
-                                                        int active_sdk) {
-    std::vector<std::string> filtered_configs;
-
-    std::map<std::string, std::pair<std::string, int>> script_map;
-    for (const auto& c : configs) {
-        int sdk = 0;
-        const std::vector<std::string> parts = android::base::Split(c, ".");
-        std::string base;
-        if (parts.size() < 2) {
-            continue;
-        }
-
-        // parts[size()-1], aka the suffix, should be "rc" or "#rc"
-        // any other pattern gets discarded
-
-        const auto& suffix = parts[parts.size() - 1];
-        if (suffix == "rc") {
-            sdk = 0;
-        } else {
-            char trailer[9] = {0};
-            int r = sscanf(suffix.c_str(), "%d%8s", &sdk, trailer);
-            if (r != 2) {
-                continue;
-            }
-            if (strlen(trailer) > 2 || strcmp(trailer, "rc") != 0) {
-                continue;
-            }
-        }
-
-        if (sdk < 0 || sdk > active_sdk) {
-            continue;
-        }
-
-        base = parts[0];
-        for (unsigned int i = 1; i < parts.size() - 1; i++) {
-            base = base + "." + parts[i];
-        }
-
-        // is this preferred over what we already have
-        auto it = script_map.find(base);
-        if (it == script_map.end() || it->second.second < sdk) {
-            script_map[base] = std::make_pair(c, sdk);
-        }
-    }
-
-    for (const auto& m : script_map) {
-        filtered_configs.push_back(m.second.first);
-    }
-    return filtered_configs;
-}
-
 bool Parser::ParseConfigDir(const std::string& path) {
     LOG(INFO) << "Parsing directory " << path << "...";
     std::unique_ptr<DIR, decltype(&closedir)> config_dir(opendir(path.c_str()), closedir);
diff --git a/init/parser.h b/init/parser.h
index 2f4108f..95b0cd7 100644
--- a/init/parser.h
+++ b/init/parser.h
@@ -76,12 +76,6 @@
     void AddSectionParser(const std::string& name, std::unique_ptr<SectionParser> parser);
     void AddSingleLineParser(const std::string& prefix, LineCallback callback);
 
-    // Compare all files */path.#rc and */path.rc with the same path prefix.
-    // Keep the one with the highest # that doesn't exceed the system's SDK.
-    // (.rc == .0rc for ranking purposes)
-    std::vector<std::string> FilterVersionedConfigs(const std::vector<std::string>& configs,
-                                                    int active_sdk);
-
     // Host init verifier check file permissions.
     bool ParseConfigFileInsecure(const std::string& path);
 
diff --git a/init/persistent_properties.cpp b/init/persistent_properties.cpp
index 716f62e..8db7267 100644
--- a/init/persistent_properties.cpp
+++ b/init/persistent_properties.cpp
@@ -77,7 +77,7 @@
         }
 
         struct stat sb;
-        if (fstat(fd, &sb) == -1) {
+        if (fstat(fd.get(), &sb) == -1) {
             PLOG(ERROR) << "fstat on property file \"" << entry->d_name << "\" failed";
             continue;
         }
@@ -155,19 +155,33 @@
     return *file_contents;
 }
 
+Result<PersistentProperties> ParsePersistentPropertyFile(const std::string& file_contents) {
+    PersistentProperties persistent_properties;
+    if (!persistent_properties.ParseFromString(file_contents)) {
+        return Error() << "Unable to parse persistent property file: Could not parse protobuf";
+    }
+    for (auto& prop : persistent_properties.properties()) {
+        if (!StartsWith(prop.name(), "persist.")) {
+            return Error() << "Unable to load persistent property file: property '" << prop.name()
+                           << "' doesn't start with 'persist.'";
+        }
+    }
+    return persistent_properties;
+}
+
 }  // namespace
 
 Result<PersistentProperties> LoadPersistentPropertyFile() {
     auto file_contents = ReadPersistentPropertyFile();
     if (!file_contents.ok()) return file_contents.error();
 
-    PersistentProperties persistent_properties;
-    if (persistent_properties.ParseFromString(*file_contents)) return persistent_properties;
-
-    // If the file cannot be parsed in either format, then we don't have any recovery
-    // mechanisms, so we delete it to allow for future writes to take place successfully.
-    unlink(persistent_property_filename.c_str());
-    return Error() << "Unable to parse persistent property file: Could not parse protobuf";
+    auto persistent_properties = ParsePersistentPropertyFile(*file_contents);
+    if (!persistent_properties.ok()) {
+        // If the file cannot be parsed in either format, then we don't have any recovery
+        // mechanisms, so we delete it to allow for future writes to take place successfully.
+        unlink(persistent_property_filename.c_str());
+    }
+    return persistent_properties;
 }
 
 Result<void> WritePersistentPropertyFile(const PersistentProperties& persistent_properties) {
@@ -184,7 +198,7 @@
     if (!WriteStringToFd(serialized_string, fd)) {
         return ErrnoError() << "Unable to write file contents";
     }
-    fsync(fd);
+    fsync(fd.get());
     fd.reset();
 
     if (rename(temp_filename.c_str(), persistent_property_filename.c_str())) {
@@ -202,7 +216,7 @@
     if (dir_fd < 0) {
         return ErrnoError() << "Unable to open persistent properties directory for fsync()";
     }
-    fsync(dir_fd);
+    fsync(dir_fd.get());
 
     return {};
 }
diff --git a/init/persistent_properties_test.cpp b/init/persistent_properties_test.cpp
index 60cecde..e5d26db 100644
--- a/init/persistent_properties_test.cpp
+++ b/init/persistent_properties_test.cpp
@@ -155,5 +155,28 @@
     EXPECT_FALSE(it == read_back_properties.properties().end());
 }
 
+TEST(persistent_properties, RejectNonPersistProperty) {
+    TemporaryFile tf;
+    ASSERT_TRUE(tf.fd != -1);
+    persistent_property_filename = tf.path;
+
+    WritePersistentProperty("notpersist.sys.locale", "pt-BR");
+
+    auto read_back_properties = LoadPersistentProperties();
+    EXPECT_EQ(read_back_properties.properties().size(), 0);
+
+    WritePersistentProperty("persist.sys.locale", "pt-BR");
+
+    read_back_properties = LoadPersistentProperties();
+    EXPECT_GT(read_back_properties.properties().size(), 0);
+
+    auto it = std::find_if(read_back_properties.properties().begin(),
+                           read_back_properties.properties().end(), [](const auto& entry) {
+                               return entry.name() == "persist.sys.locale" &&
+                                      entry.value() == "pt-BR";
+                           });
+    EXPECT_FALSE(it == read_back_properties.properties().end());
+}
+
 }  // namespace init
 }  // namespace android
diff --git a/init/property_service.cpp b/init/property_service.cpp
index 26341b1..9df9828 100644
--- a/init/property_service.cpp
+++ b/init/property_service.cpp
@@ -54,6 +54,7 @@
 #include <android-base/logging.h>
 #include <android-base/parseint.h>
 #include <android-base/properties.h>
+#include <android-base/result.h>
 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
 #include <property_info_parser/property_info_parser.h>
@@ -76,9 +77,12 @@
 
 using namespace std::literals;
 
+using android::base::ErrnoError;
+using android::base::Error;
 using android::base::GetProperty;
 using android::base::ParseInt;
 using android::base::ReadFileToString;
+using android::base::Result;
 using android::base::Split;
 using android::base::StartsWith;
 using android::base::StringPrintf;
@@ -296,13 +300,13 @@
         if (!socket_.ok()) {
             return true;
         }
-        int result = TEMP_FAILURE_RETRY(send(socket_, &value, sizeof(value), 0));
+        int result = TEMP_FAILURE_RETRY(send(socket_.get(), &value, sizeof(value), 0));
         return result == sizeof(value);
     }
 
     bool GetSourceContext(std::string* source_context) const {
         char* c_source_context = nullptr;
-        if (getpeercon(socket_, &c_source_context) != 0) {
+        if (getpeercon(socket_.get(), &c_source_context) != 0) {
             return false;
         }
         *source_context = c_source_context;
@@ -316,13 +320,13 @@
 
   private:
     bool PollIn(uint32_t* timeout_ms) {
-        struct pollfd ufds[1];
-        ufds[0].fd = socket_;
-        ufds[0].events = POLLIN;
-        ufds[0].revents = 0;
+        struct pollfd ufd = {
+                .fd = socket_.get(),
+                .events = POLLIN,
+        };
         while (*timeout_ms > 0) {
             auto start_time = std::chrono::steady_clock::now();
-            int nr = poll(ufds, 1, *timeout_ms);
+            int nr = poll(&ufd, 1, *timeout_ms);
             auto now = std::chrono::steady_clock::now();
             auto time_elapsed =
                 std::chrono::duration_cast<std::chrono::milliseconds>(now - start_time);
@@ -364,7 +368,7 @@
                 return false;
             }
 
-            int result = TEMP_FAILURE_RETRY(recv(socket_, data, bytes_left, MSG_DONTWAIT));
+            int result = TEMP_FAILURE_RETRY(recv(socket_.get(), data, bytes_left, MSG_DONTWAIT));
             if (result <= 0) {
                 PLOG(ERROR) << "sys_prop: recv error";
                 return false;
@@ -629,8 +633,8 @@
     return result;
 }
 
-static bool load_properties_from_file(const char*, const char*,
-                                      std::map<std::string, std::string>*);
+static Result<void> load_properties_from_file(const char*, const char*,
+                                              std::map<std::string, std::string>*);
 
 /*
  * Filter is used to decide which properties to load: NULL loads all keys,
@@ -691,7 +695,10 @@
                 continue;
             }
 
-            load_properties_from_file(expanded_filename->c_str(), key, properties);
+            if (auto res = load_properties_from_file(expanded_filename->c_str(), key, properties);
+                !res.ok()) {
+                LOG(WARNING) << res.error();
+            }
         } else {
             value = strchr(key, '=');
             if (!value) continue;
@@ -738,20 +745,19 @@
 
 // Filter is used to decide which properties to load: NULL loads all keys,
 // "ro.foo.*" is a prefix match, and "ro.foo.bar" is an exact match.
-static bool load_properties_from_file(const char* filename, const char* filter,
-                                      std::map<std::string, std::string>* properties) {
+static Result<void> load_properties_from_file(const char* filename, const char* filter,
+                                              std::map<std::string, std::string>* properties) {
     Timer t;
     auto file_contents = ReadFile(filename);
     if (!file_contents.ok()) {
-        PLOG(WARNING) << "Couldn't load property file '" << filename
-                      << "': " << file_contents.error();
-        return false;
+        return Error() << "Couldn't load property file '" << filename
+                       << "': " << file_contents.error();
     }
     file_contents->push_back('\n');
 
     LoadProperties(file_contents->data(), filter, filename, properties);
     LOG(VERBOSE) << "(Loading properties from " << filename << " took " << t << ".)";
-    return true;
+    return {};
 }
 
 static void LoadPropertiesFromSecondStageRes(std::map<std::string, std::string>* properties) {
@@ -760,7 +766,9 @@
         CHECK(errno == ENOENT) << "Cannot access " << prop << ": " << strerror(errno);
         return;
     }
-    load_properties_from_file(prop.c_str(), nullptr, properties);
+    if (auto res = load_properties_from_file(prop.c_str(), nullptr, properties); !res.ok()) {
+        LOG(WARNING) << res.error();
+    }
 }
 
 // persist.sys.usb.config values can't be combined on build-time when property
@@ -1058,7 +1066,10 @@
     std::map<std::string, std::string> properties;
 
     if (IsRecoveryMode()) {
-        load_properties_from_file("/prop.default", nullptr, &properties);
+        if (auto res = load_properties_from_file("/prop.default", nullptr, &properties);
+            !res.ok()) {
+            LOG(ERROR) << res.error();
+        }
     }
 
     // /<part>/etc/build.prop is the canonical location of the build-time properties since S.
@@ -1067,7 +1078,7 @@
     const auto load_properties_from_partition = [&properties](const std::string& partition,
                                                               int support_legacy_path_until) {
         auto path = "/" + partition + "/etc/build.prop";
-        if (load_properties_from_file(path.c_str(), nullptr, &properties)) {
+        if (load_properties_from_file(path.c_str(), nullptr, &properties).ok()) {
             return;
         }
         // To read ro.<partition>.build.version.sdk, temporarily load the legacy paths into a
@@ -1105,7 +1116,13 @@
     // Order matters here. The more the partition is specific to a product, the higher its
     // precedence is.
     LoadPropertiesFromSecondStageRes(&properties);
-    load_properties_from_file("/system/build.prop", nullptr, &properties);
+
+    // system should have build.prop, unlike the other partitions
+    if (auto res = load_properties_from_file("/system/build.prop", nullptr, &properties);
+        !res.ok()) {
+        LOG(WARNING) << res.error();
+    }
+
     load_properties_from_partition("system_ext", /* support_legacy_path_until */ 30);
     load_properties_from_file("/system_dlkm/etc/build.prop", nullptr, &properties);
     // TODO(b/117892318): uncomment the following condition when vendor.imgs for aosp_* targets are
@@ -1121,7 +1138,10 @@
 
     if (access(kDebugRamdiskProp, R_OK) == 0) {
         LOG(INFO) << "Loading " << kDebugRamdiskProp;
-        load_properties_from_file(kDebugRamdiskProp, nullptr, &properties);
+        if (auto res = load_properties_from_file(kDebugRamdiskProp, nullptr, &properties);
+            !res.ok()) {
+            LOG(WARNING) << res.error();
+        }
     }
 
     for (const auto& [name, value] : properties) {
@@ -1331,6 +1351,11 @@
                 InitPropertySet(persistent_property_record.name(),
                                 persistent_property_record.value());
             }
+            // Apply debug ramdisk special settings after persistent properties are loaded.
+            if (android::base::GetBoolProperty("ro.force.debuggable", false)) {
+                // Always enable usb adb if device is booted with debug ramdisk.
+                update_sys_usb_config();
+            }
             InitPropertySet("ro.persistent_properties.ready", "true");
             persistent_properties_loaded = true;
             break;
@@ -1356,13 +1381,9 @@
     }
 
     while (true) {
-        auto pending_functions = epoll.Wait(std::nullopt);
-        if (!pending_functions.ok()) {
-            LOG(ERROR) << pending_functions.error();
-        } else {
-            for (const auto& function : *pending_functions) {
-                (*function)();
-            }
+        auto epoll_result = epoll.Wait(std::nullopt);
+        if (!epoll_result.ok()) {
+            LOG(ERROR) << epoll_result.error();
         }
     }
 }
diff --git a/init/reboot.cpp b/init/reboot.cpp
index 41cf748..a3fc534 100644
--- a/init/reboot.cpp
+++ b/init/reboot.cpp
@@ -491,7 +491,7 @@
         return ErrnoError() << "zram_backing_dev: swapoff (" << backing_dev << ")"
                             << " failed";
     }
-    LOG(INFO) << "swapoff() took " << swap_timer;;
+    LOG(INFO) << "swapoff() took " << swap_timer;
 
     if (!WriteStringToFile("1", ZRAM_RESET)) {
         return Error() << "zram_backing_dev: reset (" << backing_dev << ")"
@@ -567,6 +567,11 @@
 }
 
 static Result<void> UnmountAllApexes() {
+    // don't need to unmount because apexd doesn't use /data in Microdroid
+    if (IsMicrodroid()) {
+        return {};
+    }
+
     const char* args[] = {"/system/bin/apexd", "--unmount-all"};
     int status;
     if (logwrap_fork_execvp(arraysize(args), args, &status, false, LOG_KLOG, true, nullptr) != 0) {
@@ -608,7 +613,7 @@
     if (sem_init(&reboot_semaphore, false, 0) == -1) {
         // These should never fail, but if they do, skip the graceful reboot and reboot immediately.
         LOG(ERROR) << "sem_init() fail and RebootSystem() return!";
-        RebootSystem(cmd, reboot_target);
+        RebootSystem(cmd, reboot_target, reason);
     }
 
     // Start a thread to monitor init shutdown process
@@ -636,7 +641,7 @@
     // worry about unmounting it.
     if (!IsDataMounted("*")) {
         sync();
-        RebootSystem(cmd, reboot_target);
+        RebootSystem(cmd, reboot_target, reason);
         abort();
     }
 
@@ -762,14 +767,14 @@
     if (IsDataMounted("f2fs")) {
         uint32_t flag = F2FS_GOING_DOWN_FULLSYNC;
         unique_fd fd(TEMP_FAILURE_RETRY(open("/data", O_RDONLY)));
-        int ret = ioctl(fd, F2FS_IOC_SHUTDOWN, &flag);
+        int ret = ioctl(fd.get(), F2FS_IOC_SHUTDOWN, &flag);
         if (ret) {
             PLOG(ERROR) << "Shutdown /data: ";
         } else {
             LOG(INFO) << "Shutdown /data";
         }
     }
-    RebootSystem(cmd, reboot_target);
+    RebootSystem(cmd, reboot_target, reason);
     abort();
 }
 
@@ -892,7 +897,16 @@
         sub_reason = "ns_switch";
         return Error() << "Failed to switch to bootstrap namespace";
     }
-    // Remove services that were defined in an APEX.
+    ActionManager::GetInstance().RemoveActionIf([](const auto& action) -> bool {
+        if (action->IsFromApex()) {
+            std::string trigger_name = action->BuildTriggersString();
+            LOG(INFO) << "Removing action (" << trigger_name << ") from (" << action->filename()
+                      << ":" << action->line() << ")";
+            return true;
+        }
+        return false;
+    });
+    // Remove services that were defined in an APEX
     ServiceList::GetInstance().RemoveServiceIf([](const std::unique_ptr<Service>& s) -> bool {
         if (s->is_from_apex()) {
             LOG(INFO) << "Removing service '" << s->name() << "' because it's defined in an APEX";
diff --git a/init/reboot_utils.cpp b/init/reboot_utils.cpp
index b3fa9fd..e6b868e 100644
--- a/init/reboot_utils.cpp
+++ b/init/reboot_utils.cpp
@@ -26,8 +26,8 @@
 #include <android-base/logging.h>
 #include <android-base/properties.h>
 #include <android-base/strings.h>
-#include <backtrace/Backtrace.h>
 #include <cutils/android_reboot.h>
+#include <unwindstack/AndroidUnwinder.h>
 
 #include "capabilities.h"
 #include "reboot_utils.h"
@@ -106,7 +106,8 @@
     return value == CAP_SET;
 }
 
-void __attribute__((noreturn)) RebootSystem(unsigned int cmd, const std::string& rebootTarget) {
+void __attribute__((noreturn))
+RebootSystem(unsigned int cmd, const std::string& rebootTarget, const std::string& reboot_reason) {
     LOG(INFO) << "Reboot ending, jumping to kernel";
 
     if (!IsRebootCapable()) {
@@ -127,10 +128,12 @@
 
         case ANDROID_RB_THERMOFF:
             if (android::base::GetBoolProperty("ro.thermal_warmreset", false)) {
+                std::string reason = "shutdown,thermal";
+                if (!reboot_reason.empty()) reason = reboot_reason;
+
                 LOG(INFO) << "Try to trigger a warm reset for thermal shutdown";
-                static constexpr const char kThermalShutdownTarget[] = "shutdown,thermal";
                 syscall(__NR_reboot, LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2,
-                        LINUX_REBOOT_CMD_RESTART2, kThermalShutdownTarget);
+                        LINUX_REBOOT_CMD_RESTART2, reason.c_str());
             } else {
                 reboot(RB_POWER_OFF);
             }
@@ -157,13 +160,13 @@
 
     // In the parent, let's try to get a backtrace then shutdown.
     LOG(ERROR) << __FUNCTION__ << ": signal " << signal_number;
-    std::unique_ptr<Backtrace> backtrace(
-            Backtrace::Create(BACKTRACE_CURRENT_PROCESS, BACKTRACE_CURRENT_THREAD));
-    if (!backtrace->Unwind(0)) {
-        LOG(ERROR) << __FUNCTION__ << ": Failed to unwind callstack.";
+    unwindstack::AndroidLocalUnwinder unwinder;
+    unwindstack::AndroidUnwinderData data;
+    if (!unwinder.Unwind(data)) {
+        LOG(ERROR) << __FUNCTION__ << ": Failed to unwind callstack: " << data.GetErrorString();
     }
-    for (size_t i = 0; i < backtrace->NumFrames(); i++) {
-        LOG(ERROR) << backtrace->FormatFrameData(i);
+    for (const auto& frame : data.frames) {
+        LOG(ERROR) << unwinder.FormatFrame(frame);
     }
     if (init_fatal_panic) {
         LOG(ERROR) << __FUNCTION__ << ": Trigger crash";
diff --git a/init/reboot_utils.h b/init/reboot_utils.h
index a0023b9..09e87ef 100644
--- a/init/reboot_utils.h
+++ b/init/reboot_utils.h
@@ -29,7 +29,8 @@
 // so if any of the attempts to determine this fail, it will still return true.
 bool IsRebootCapable();
 // This is a wrapper around the actual reboot calls.
-void __attribute__((noreturn)) RebootSystem(unsigned int cmd, const std::string& reboot_target);
+void __attribute__((noreturn)) RebootSystem(unsigned int cmd, const std::string& reboot_target,
+                                            const std::string& reboot_reason = "");
 void __attribute__((noreturn)) InitFatalReboot(int signal_number);
 void InstallRebootSignalHandlers();
 
diff --git a/init/security.cpp b/init/security.cpp
index 970696e..6e616be 100644
--- a/init/security.cpp
+++ b/init/security.cpp
@@ -15,6 +15,7 @@
  */
 
 #include "security.h"
+#include "util.h"
 
 #include <errno.h>
 #include <fcntl.h>
@@ -89,7 +90,7 @@
 
 // Set /proc/sys/vm/mmap_rnd_bits and potentially
 // /proc/sys/vm/mmap_rnd_compat_bits to the maximum supported values.
-// Returns -1 if unable to set these to an acceptable value.
+// Returns an error if unable to set these to an acceptable value.
 //
 // To support this sysctl, the following upstream commits are needed:
 //
@@ -105,13 +106,27 @@
     // uml does not support mmap_rnd_bits
     return {};
 #elif defined(__aarch64__)
-    // arm64 supports 18 - 33 bits depending on pagesize and VA_SIZE
-    if (SetMmapRndBitsMin(33, 24, false) && SetMmapRndBitsMin(16, 16, true)) {
+    // arm64 architecture supports 18 - 33 rnd bits depending on pagesize and
+    // VA_SIZE. However the kernel might have been compiled with a narrower
+    // range using CONFIG_ARCH_MMAP_RND_BITS_MIN/MAX. To use the maximum
+    // supported number of bits, we start from the theoretical maximum of 33
+    // bits and try smaller values until we reach 24 bits which is the
+    // Android-specific minimum. Don't go lower even if the configured maximum
+    // is smaller than 24.
+    if (SetMmapRndBitsMin(33, 24, false) && (!Has32BitAbi() || SetMmapRndBitsMin(16, 16, true))) {
+        return {};
+    }
+#elif defined(__riscv)
+    // TODO: sv48 and sv57 were both added to the kernel this year, so we
+    // probably just need some kernel fixes to enable higher ASLR randomization,
+    // but for now 24 is the maximum that the kernel supports.
+    if (SetMmapRndBitsMin(24, 18, false)) {
         return {};
     }
 #elif defined(__x86_64__)
-    // x86_64 supports 28 - 32 bits
-    if (SetMmapRndBitsMin(32, 32, false) && SetMmapRndBitsMin(16, 16, true)) {
+    // x86_64 supports 28 - 32 rnd bits, but Android wants to ensure that the
+    // theoretical maximum of 32 bits is always supported and used.
+    if (SetMmapRndBitsMin(32, 32, false) && (!Has32BitAbi() || SetMmapRndBitsMin(16, 16, true))) {
         return {};
     }
 #elif defined(__arm__) || defined(__i386__)
@@ -201,7 +216,7 @@
         return {};
     }
 
-    int ioctl_ret = ioctl(fd, PERF_EVENT_IOC_RESET);
+    int ioctl_ret = ioctl(fd.get(), PERF_EVENT_IOC_RESET);
     if (ioctl_ret != -1) {
         // Success implies that the kernel doesn't have the hooks.
         return {};
diff --git a/init/selinux.cpp b/init/selinux.cpp
index be8c554..ea308aa 100644
--- a/init/selinux.cpp
+++ b/init/selinux.cpp
@@ -237,9 +237,9 @@
     // If there is an odm partition, precompiled_sepolicy will be in
     // odm/etc/selinux. Otherwise it will be in vendor/etc/selinux.
     static constexpr const char vendor_precompiled_sepolicy[] =
-        "/vendor/etc/selinux/precompiled_sepolicy";
+            "/vendor/etc/selinux/precompiled_sepolicy";
     static constexpr const char odm_precompiled_sepolicy[] =
-        "/odm/etc/selinux/precompiled_sepolicy";
+            "/odm/etc/selinux/precompiled_sepolicy";
     if (access(odm_precompiled_sepolicy, R_OK) == 0) {
         precompiled_sepolicy = odm_precompiled_sepolicy;
     } else if (access(vendor_precompiled_sepolicy, R_OK) == 0) {
@@ -525,6 +525,32 @@
                                              "apex_service_contexts", "apex_seapp_contexts",
                                              "apex_test"};
 
+Result<void> CreateTmpfsDir() {
+    mode_t mode = 0744;
+    struct stat stat_data;
+    if (stat(kTmpfsDir.c_str(), &stat_data) != 0) {
+        if (errno != ENOENT) {
+            return ErrnoError() << "Could not stat " << kTmpfsDir;
+        }
+        if (mkdir(kTmpfsDir.c_str(), mode) != 0) {
+            return ErrnoError() << "Could not mkdir " << kTmpfsDir;
+        }
+    } else {
+        if (!S_ISDIR(stat_data.st_mode)) {
+            return Error() << kTmpfsDir << " exists and is not a directory.";
+        }
+        LOG(WARNING) << "Directory " << kTmpfsDir << " already exists";
+    }
+
+    // Need to manually call chmod because mkdir will create a folder with
+    // permissions mode & ~umask.
+    if (chmod(kTmpfsDir.c_str(), mode) != 0) {
+        return ErrnoError() << "Could not chmod " << kTmpfsDir;
+    }
+
+    return {};
+}
+
 Result<void> PutFileInTmpfs(ZipArchiveHandle archive, const std::string& fileName) {
     ZipEntry entry;
     std::string dstPath = kTmpfsDir + fileName;
@@ -538,10 +564,10 @@
     unique_fd fd(TEMP_FAILURE_RETRY(
             open(dstPath.c_str(), O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, S_IRUSR | S_IWUSR)));
     if (fd == -1) {
-        return Error() << "Failed to open " << dstPath;
+        return ErrnoError() << "Failed to open " << dstPath;
     }
 
-    ret = ExtractEntryToFile(archive, &entry, fd);
+    ret = ExtractEntryToFile(archive, &entry, fd.get());
     if (ret != 0) {
         return Error() << "Failed to extract entry \"" << fileName << "\" ("
                        << entry.uncompressed_length << " bytes) to \"" << dstPath
@@ -568,6 +594,11 @@
 
     auto handle_guard = android::base::make_scope_guard([&handle] { CloseArchive(handle); });
 
+    auto create = CreateTmpfsDir();
+    if (!create.ok()) {
+        return create.error();
+    }
+
     for (const auto& file : kApexSepolicy) {
         auto extract = PutFileInTmpfs(handle, file);
         if (!extract.ok()) {
@@ -754,7 +785,7 @@
         return;
     }
 
-    TEMP_FAILURE_RETRY(send(fd, &request, sizeof(request), 0));
+    TEMP_FAILURE_RETRY(send(fd.get(), &request, sizeof(request), 0));
 }
 
 }  // namespace
diff --git a/init/service.cpp b/init/service.cpp
index bd704cf..b9b3309 100644
--- a/init/service.cpp
+++ b/init/service.cpp
@@ -16,6 +16,7 @@
 
 #include "service.h"
 
+#include <errno.h>
 #include <fcntl.h>
 #include <inttypes.h>
 #include <linux/securebits.h>
@@ -36,10 +37,17 @@
 #include <processgroup/processgroup.h>
 #include <selinux/selinux.h>
 
+#include <string>
+
+#include "interprocess_fifo.h"
 #include "lmkd_service.h"
 #include "service_list.h"
 #include "util.h"
 
+#if defined(__BIONIC__)
+#include <bionic/reserved_signals.h>
+#endif
+
 #ifdef INIT_FULL_SOURCES
 #include <ApexProperties.sysprop.h>
 #include <android/api-level.h>
@@ -53,6 +61,7 @@
 
 using android::base::boot_clock;
 using android::base::GetBoolProperty;
+using android::base::GetIntProperty;
 using android::base::GetProperty;
 using android::base::Join;
 using android::base::make_scope_guard;
@@ -127,17 +136,15 @@
 
 unsigned long Service::next_start_order_ = 1;
 bool Service::is_exec_service_running_ = false;
-pid_t Service::exec_service_pid_ = -1;
-std::chrono::time_point<std::chrono::steady_clock> Service::exec_service_started_;
 
 Service::Service(const std::string& name, Subcontext* subcontext_for_restart_commands,
-                 const std::vector<std::string>& args, bool from_apex)
-    : Service(name, 0, 0, 0, {}, 0, "", subcontext_for_restart_commands, args, from_apex) {}
+                 const std::string& filename, const std::vector<std::string>& args)
+    : Service(name, 0, 0, 0, {}, 0, "", subcontext_for_restart_commands, filename, args) {}
 
 Service::Service(const std::string& name, unsigned flags, uid_t uid, gid_t gid,
                  const std::vector<gid_t>& supp_gids, int namespace_flags,
                  const std::string& seclabel, Subcontext* subcontext_for_restart_commands,
-                 const std::vector<std::string>& args, bool from_apex)
+                 const std::string& filename, const std::vector<std::string>& args)
     : name_(name),
       classnames_({"default"}),
       flags_(flags),
@@ -157,7 +164,7 @@
       oom_score_adjust_(DEFAULT_OOM_SCORE_ADJUST),
       start_order_(0),
       args_(args),
-      from_apex_(from_apex) {}
+      filename_(filename) {}
 
 void Service::NotifyStateChange(const std::string& new_state) const {
     if ((flags_ & SVC_TEMPORARY) != 0) {
@@ -218,7 +225,7 @@
     }
 }
 
-void Service::SetProcessAttributesAndCaps() {
+void Service::SetProcessAttributesAndCaps(InterprocessFifo setsid_finished) {
     // Keep capabilites on uid change.
     if (capabilities_ && proc_attr_.uid) {
         // If Android is running in a container, some securebits might already
@@ -233,7 +240,7 @@
         }
     }
 
-    if (auto result = SetProcessAttributes(proc_attr_); !result.ok()) {
+    if (auto result = SetProcessAttributes(proc_attr_, std::move(setsid_finished)); !result.ok()) {
         LOG(FATAL) << "cannot set attribute for " << name_ << ": " << result.error();
     }
 
@@ -283,7 +290,8 @@
     }
 
     if ((siginfo.si_code != CLD_EXITED || siginfo.si_status != 0) && on_failure_reboot_target_) {
-        LOG(ERROR) << "Service with 'reboot_on_failure' option failed, shutting down system.";
+        LOG(ERROR) << "Service " << name_
+                   << " has 'reboot_on_failure' option and failed, shutting down system.";
         trigger_shutdown(*on_failure_reboot_target_);
     }
 
@@ -316,7 +324,37 @@
 #else
     static bool is_apex_updatable = false;
 #endif
-    const bool is_process_updatable = !use_bootstrap_ns_ && is_apex_updatable;
+    const bool use_default_mount_ns =
+            mount_namespace_.has_value() && *mount_namespace_ == NS_DEFAULT;
+    const bool is_process_updatable = use_default_mount_ns && is_apex_updatable;
+
+#if defined(__BIONIC__) && defined(SEGV_MTEAERR)
+    // As a precaution, we only upgrade a service once per reboot, to limit
+    // the potential impact.
+    //
+    // BIONIC_SIGNAL_ART_PROFILER is a magic value used by deuggerd to signal
+    // that the process crashed with SIGSEGV and SEGV_MTEAERR. This signal will
+    // never be seen otherwise in a crash, because it always gets handled by the
+    // profiling signal handlers in bionic. See also
+    // debuggerd/handler/debuggerd_handler.cpp.
+    bool should_upgrade_mte = siginfo.si_code != CLD_EXITED &&
+                              siginfo.si_status == BIONIC_SIGNAL_ART_PROFILER && !upgraded_mte_;
+
+    if (should_upgrade_mte) {
+        constexpr int kDefaultUpgradeSecs = 60;
+        int secs = GetIntProperty("persist.device_config.memory_safety_native.upgrade_secs.default",
+                                  kDefaultUpgradeSecs);
+        secs = GetIntProperty(
+                "persist.device_config.memory_safety_native.upgrade_secs.service." + name_, secs);
+        if (secs > 0) {
+            LOG(INFO) << "Upgrading service " << name_ << " to sync MTE for " << secs << " seconds";
+            once_environment_vars_.emplace_back("BIONIC_MEMTAG_UPGRADE_SECS", std::to_string(secs));
+            upgraded_mte_ = true;
+        } else {
+            LOG(INFO) << "Not upgrading service " << name_ << " to sync MTE due to device config";
+        }
+    }
+#endif
 
     // If we crash > 4 times in 'fatal_crash_window_' minutes or before boot_completed,
     // reboot into bootloader or set crashing property
@@ -394,8 +432,6 @@
 
     flags_ |= SVC_EXEC;
     is_exec_service_running_ = true;
-    exec_service_pid_ = pid_;
-    exec_service_started_ = std::chrono::steady_clock::now();
 
     LOG(INFO) << "SVC_EXEC service '" << name_ << "' pid " << pid_ << " (uid " << proc_attr_.uid
               << " gid " << proc_attr_.gid << "+" << proc_attr_.supp_gids.size() << " context "
@@ -405,14 +441,6 @@
     return {};
 }
 
-static void ClosePipe(const std::array<int, 2>* pipe) {
-    for (const auto fd : *pipe) {
-        if (fd >= 0) {
-            close(fd);
-        }
-    }
-}
-
 Result<void> Service::CheckConsole() {
     if (!(flags_ & SVC_CONSOLE)) {
         return {};
@@ -476,13 +504,15 @@
 }
 
 // Enters namespaces, sets environment variables, writes PID files and runs the service executable.
-void Service::RunService(const std::optional<MountNamespace>& override_mount_namespace,
-                         const std::vector<Descriptor>& descriptors,
-                         std::unique_ptr<std::array<int, 2>, decltype(&ClosePipe)> pipefd) {
-    if (auto result = EnterNamespaces(namespaces_, name_, override_mount_namespace); !result.ok()) {
+void Service::RunService(const std::vector<Descriptor>& descriptors,
+                         InterprocessFifo cgroups_activated, InterprocessFifo setsid_finished) {
+    if (auto result = EnterNamespaces(namespaces_, name_, mount_namespace_); !result.ok()) {
         LOG(FATAL) << "Service '" << name_ << "' failed to set up namespaces: " << result.error();
     }
 
+    for (const auto& [key, value] : once_environment_vars_) {
+        setenv(key.c_str(), value.c_str(), 1);
+    }
     for (const auto& [key, value] : environment_vars_) {
         setenv(key.c_str(), value.c_str(), 1);
     }
@@ -497,23 +527,33 @@
 
     // Wait until the cgroups have been created and until the cgroup controllers have been
     // activated.
-    char byte = 0;
-    if (read((*pipefd)[0], &byte, 1) < 0) {
-        PLOG(ERROR) << "failed to read from notification channel";
+    Result<uint8_t> byte = cgroups_activated.Read();
+    if (!byte.ok()) {
+        LOG(ERROR) << name_ << ": failed to read from notification channel: " << byte.error();
     }
-    pipefd.reset();
-    if (!byte) {
+    cgroups_activated.Close();
+    if (*byte != kCgroupsActivated) {
         LOG(FATAL) << "Service '" << name_  << "' failed to start due to a fatal error";
         _exit(EXIT_FAILURE);
     }
 
-    if (task_profiles_.size() > 0 && !SetTaskProfiles(getpid(), task_profiles_)) {
-        LOG(ERROR) << "failed to set task profiles";
+    if (task_profiles_.size() > 0) {
+        bool succeeded = SelinuxGetVendorAndroidVersion() < __ANDROID_API_U__
+                                 ?
+                                 // Compatibility mode: apply the task profiles to the current
+                                 // thread.
+                                 SetTaskProfiles(getpid(), task_profiles_)
+                                 :
+                                 // Apply the task profiles to the current process.
+                                 SetProcessProfiles(getuid(), getpid(), task_profiles_);
+        if (!succeeded) {
+            LOG(ERROR) << "failed to set task profiles";
+        }
     }
 
     // As requested, set our gid, supplemental gids, uid, context, and
     // priority. Aborts on failure.
-    SetProcessAttributesAndCaps();
+    SetProcessAttributesAndCaps(std::move(setsid_finished));
 
     if (!ExpandArgsAndExecv(args_, sigstop_)) {
         PLOG(ERROR) << "cannot execv('" << args_[0]
@@ -556,11 +596,14 @@
         return {};
     }
 
-    std::unique_ptr<std::array<int, 2>, decltype(&ClosePipe)> pipefd(new std::array<int, 2>{-1, -1},
-                                                                     ClosePipe);
-    if (pipe(pipefd->data()) < 0) {
-        return ErrnoError() << "pipe()";
-    }
+    // cgroups_activated is used for communication from the parent to the child
+    // while setsid_finished is used for communication from the child process to
+    // the parent process. These two communication channels are separate because
+    // combining these into a single communication channel would introduce a
+    // race between the Write() calls by the parent and by the child.
+    InterprocessFifo cgroups_activated, setsid_finished;
+    OR_RETURN(cgroups_activated.Initialize());
+    OR_RETURN(setsid_finished.Initialize());
 
     if (Result<void> result = CheckConsole(); !result.ok()) {
         return result;
@@ -583,26 +626,9 @@
         scon = *result;
     }
 
-    // APEXd is always started in the "current" namespace because it is the process to set up
-    // the current namespace.
-    const bool is_apexd = args_[0] == "/system/bin/apexd";
-
-    if (!IsDefaultMountNamespaceReady() && !is_apexd) {
-        // If this service is started before APEXes and corresponding linker configuration
-        // get available, mark it as pre-apexd one. Note that this marking is
-        // permanent. So for example, if the service is re-launched (e.g., due
-        // to crash), it is still recognized as pre-apexd... for consistency.
-        use_bootstrap_ns_ = true;
-    }
-
-    // For pre-apexd services, override mount namespace as "bootstrap" one before starting.
-    // Note: "ueventd" is supposed to be run in "default" mount namespace even if it's pre-apexd
-    // to support loading firmwares from APEXes.
-    std::optional<MountNamespace> override_mount_namespace;
-    if (name_ == "ueventd") {
-        override_mount_namespace = NS_DEFAULT;
-    } else if (use_bootstrap_ns_) {
-        override_mount_namespace = NS_BOOTSTRAP;
+    if (!mount_namespace_.has_value()) {
+        // remember from which mount namespace the service should start
+        SetMountNamespace();
     }
 
     post_data_ = ServiceList::GetInstance().IsPostData();
@@ -635,8 +661,13 @@
 
     if (pid == 0) {
         umask(077);
-        RunService(override_mount_namespace, descriptors, std::move(pipefd));
+        cgroups_activated.CloseWriteFd();
+        setsid_finished.CloseReadFd();
+        RunService(descriptors, std::move(cgroups_activated), std::move(setsid_finished));
         _exit(127);
+    } else {
+        cgroups_activated.CloseReadFd();
+        setsid_finished.CloseWriteFd();
     }
 
     if (pid < 0) {
@@ -644,6 +675,8 @@
         return ErrnoError() << "Failed to fork";
     }
 
+    once_environment_vars_.clear();
+
     if (oom_score_adjust_ != DEFAULT_OOM_SCORE_ADJUST) {
         std::string oom_str = std::to_string(oom_score_adjust_);
         std::string oom_file = StringPrintf("/proc/%d/oom_score_adj", pid);
@@ -658,34 +691,99 @@
     start_order_ = next_start_order_++;
     process_cgroup_empty_ = false;
 
-    bool use_memcg = swappiness_ != -1 || soft_limit_in_bytes_ != -1 || limit_in_bytes_ != -1 ||
-                      limit_percent_ != -1 || !limit_property_.empty();
-    errno = -createProcessGroup(proc_attr_.uid, pid_, use_memcg);
-    if (errno != 0) {
-        if (char byte = 0; write((*pipefd)[1], &byte, 1) < 0) {
-            return ErrnoError() << "sending notification failed";
+    if (CgroupsAvailable()) {
+        bool use_memcg = swappiness_ != -1 || soft_limit_in_bytes_ != -1 || limit_in_bytes_ != -1 ||
+                         limit_percent_ != -1 || !limit_property_.empty();
+        errno = -createProcessGroup(proc_attr_.uid, pid_, use_memcg);
+        if (errno != 0) {
+            Result<void> result = cgroups_activated.Write(kActivatingCgroupsFailed);
+            if (!result.ok()) {
+                return Error() << "Sending notification failed: " << result.error();
+            }
+            return Error() << "createProcessGroup(" << proc_attr_.uid << ", " << pid_ << ", "
+                           << use_memcg << ") failed for service '" << name_
+                           << "': " << strerror(errno);
         }
-        return Error() << "createProcessGroup(" << proc_attr_.uid << ", " << pid_
-                       << ") failed for service '" << name_ << "'";
-    }
 
-    if (use_memcg) {
-        ConfigureMemcg();
+        // When the blkio controller is mounted in the v1 hierarchy, NormalIoPriority is
+        // the default (/dev/blkio). When the blkio controller is mounted in the v2 hierarchy, the
+        // NormalIoPriority profile has to be applied explicitly.
+        SetProcessProfiles(proc_attr_.uid, pid_, {"NormalIoPriority"});
+
+        if (use_memcg) {
+            ConfigureMemcg();
+        }
     }
 
     if (oom_score_adjust_ != DEFAULT_OOM_SCORE_ADJUST) {
         LmkdRegister(name_, proc_attr_.uid, pid_, oom_score_adjust_);
     }
 
-    if (char byte = 1; write((*pipefd)[1], &byte, 1) < 0) {
-        return ErrnoError() << "sending notification failed";
+    if (Result<void> result = cgroups_activated.Write(kCgroupsActivated); !result.ok()) {
+        return Error() << "Sending cgroups activated notification failed: " << result.error();
     }
 
+    cgroups_activated.Close();
+
+    // Call setpgid() from the parent process to make sure that this call has
+    // finished before the parent process calls kill(-pgid, ...).
+    if (!RequiresConsole(proc_attr_)) {
+        if (setpgid(pid, pid) < 0) {
+            switch (errno) {
+                case EACCES:  // Child has already performed setpgid() followed by execve().
+                case ESRCH:   // Child process no longer exists.
+                    break;
+                default:
+                    PLOG(ERROR) << "setpgid() from parent failed";
+            }
+        }
+    } else {
+        // The Read() call below will return an error if the child is killed.
+        if (Result<uint8_t> result = setsid_finished.Read();
+            !result.ok() || *result != kSetSidFinished) {
+            if (!result.ok()) {
+                return Error() << "Waiting for setsid() failed: " << result.error();
+            } else {
+                return Error() << "Waiting for setsid() failed: " << static_cast<uint32_t>(*result)
+                               << " <> " << static_cast<uint32_t>(kSetSidFinished);
+            }
+        }
+    }
+
+    setsid_finished.Close();
+
     NotifyStateChange("running");
     reboot_on_failure.Disable();
     return {};
 }
 
+// Set mount namespace for the service.
+// The reason why remember the mount namespace:
+//   If this service is started before APEXes and corresponding linker configuration
+//   get available, mark it as pre-apexd one. Note that this marking is
+//   permanent. So for example, if the service is re-launched (e.g., due
+//   to crash), it is still recognized as pre-apexd... for consistency.
+void Service::SetMountNamespace() {
+    // APEXd is always started in the "current" namespace because it is the process to set up
+    // the current namespace. So, leave mount_namespace_ as empty.
+    if (args_[0] == "/system/bin/apexd") {
+        return;
+    }
+    // Services in the following list start in the "default" mount namespace.
+    // Note that they should use bootstrap bionic if they start before APEXes are ready.
+    static const std::set<std::string> kUseDefaultMountNamespace = {
+            "ueventd",           // load firmwares from APEXes
+            "hwservicemanager",  // load VINTF fragments from APEXes
+            "servicemanager",    // load VINTF fragments from APEXes
+    };
+    if (kUseDefaultMountNamespace.find(name_) != kUseDefaultMountNamespace.end()) {
+        mount_namespace_ = NS_DEFAULT;
+        return;
+    }
+    // Use the "default" mount namespace only if it's ready
+    mount_namespace_ = IsDefaultMountNamespaceReady() ? NS_DEFAULT : NS_BOOTSTRAP;
+}
+
 void Service::SetStartedInFirstStage(pid_t pid) {
     LOG(INFO) << "adding first-stage service '" << name_ << "'...";
 
@@ -769,6 +867,8 @@
 
     if ((how != SVC_DISABLED) && (how != SVC_RESET) && (how != SVC_RESTART)) {
         // An illegal flag: default to SVC_DISABLED.
+        LOG(ERROR) << "service '" << name_ << "' requested unknown flag " << how
+                   << ", defaulting to disabling it.";
         how = SVC_DISABLED;
     }
 
@@ -851,7 +951,7 @@
     }
 
     return std::make_unique<Service>(name, flags, *uid, *gid, supp_gids, namespace_flags, seclabel,
-                                     nullptr, str_args, false);
+                                     nullptr, /*filename=*/"", str_args);
 }
 
 // This is used for snapuserd_proxy, which hands off a socket to snapuserd. It's
diff --git a/init/service.h b/init/service.h
index c314aa1..f9749d2 100644
--- a/init/service.h
+++ b/init/service.h
@@ -31,7 +31,9 @@
 
 #include "action.h"
 #include "capabilities.h"
+#include "interprocess_fifo.h"
 #include "keyword_map.h"
+#include "mount_namespace.h"
 #include "parser.h"
 #include "service_utils.h"
 #include "subcontext.h"
@@ -65,12 +67,14 @@
 
   public:
     Service(const std::string& name, Subcontext* subcontext_for_restart_commands,
-            const std::vector<std::string>& args, bool from_apex = false);
+            const std::string& filename, const std::vector<std::string>& args);
 
     Service(const std::string& name, unsigned flags, uid_t uid, gid_t gid,
             const std::vector<gid_t>& supp_gids, int namespace_flags, const std::string& seclabel,
-            Subcontext* subcontext_for_restart_commands, const std::vector<std::string>& args,
-            bool from_apex = false);
+            Subcontext* subcontext_for_restart_commands, const std::string& filename,
+            const std::vector<std::string>& args);
+    Service(const Service&) = delete;
+    void operator=(const Service&) = delete;
 
     static Result<std::unique_ptr<Service>> MakeTemporaryOneshotService(
             const std::vector<std::string>& args);
@@ -102,10 +106,6 @@
     size_t CheckAllCommands() const { return onrestart_.CheckAllCommands(); }
 
     static bool is_exec_service_running() { return is_exec_service_running_; }
-    static pid_t exec_service_pid() { return exec_service_pid_; }
-    static std::chrono::time_point<std::chrono::steady_clock> exec_service_started() {
-        return exec_service_started_;
-    }
 
     const std::string& name() const { return name_; }
     const std::set<std::string>& classnames() const { return classnames_; }
@@ -133,7 +133,7 @@
     const std::vector<std::string>& args() const { return args_; }
     bool is_updatable() const { return updatable_; }
     bool is_post_data() const { return post_data_; }
-    bool is_from_apex() const { return from_apex_; }
+    bool is_from_apex() const { return base::StartsWith(filename_, "/apex/"); }
     void set_oneshot(bool value) {
         if (value) {
             flags_ |= SVC_ONESHOT;
@@ -141,27 +141,25 @@
             flags_ &= ~SVC_ONESHOT;
         }
     }
-    Subcontext* subcontext() const { return subcontext_; }
+    const Subcontext* subcontext() const { return subcontext_; }
+    const std::string& filename() const { return filename_; }
+    void set_filename(const std::string& name) { filename_ = name; }
 
   private:
     void NotifyStateChange(const std::string& new_state) const;
     void StopOrReset(int how);
     void KillProcessGroup(int signal, bool report_oneshot = false);
-    void SetProcessAttributesAndCaps();
+    void SetProcessAttributesAndCaps(InterprocessFifo setsid_finished);
     void ResetFlagsForStart();
     Result<void> CheckConsole();
     void ConfigureMemcg();
-    void RunService(
-            const std::optional<MountNamespace>& override_mount_namespace,
-            const std::vector<Descriptor>& descriptors,
-            std::unique_ptr<std::array<int, 2>, void (*)(const std::array<int, 2>* pipe)> pipefd);
-
+    void RunService(const std::vector<Descriptor>& descriptors, InterprocessFifo cgroups_activated,
+                    InterprocessFifo setsid_finished);
+    void SetMountNamespace();
     static unsigned long next_start_order_;
     static bool is_exec_service_running_;
-    static std::chrono::time_point<std::chrono::steady_clock> exec_service_started_;
-    static pid_t exec_service_pid_;
 
-    std::string name_;
+    const std::string name_;
     std::set<std::string> classnames_;
 
     unsigned flags_;
@@ -169,6 +167,7 @@
     android::base::boot_clock::time_point time_started_;  // time of last start
     android::base::boot_clock::time_point time_crashed_;  // first crash within inspection window
     int crash_count_;                     // number of times crashed within window
+    bool upgraded_mte_ = false;           // whether we upgraded async MTE -> sync MTE before
     std::chrono::minutes fatal_crash_window_ = 4min;  // fatal() when more than 4 crashes in it
     std::optional<std::string> fatal_reboot_target_;  // reboot target of fatal handler
 
@@ -181,8 +180,10 @@
     std::vector<SocketDescriptor> sockets_;
     std::vector<FileDescriptor> files_;
     std::vector<std::pair<std::string, std::string>> environment_vars_;
+    // Environment variables that only get applied to the next run.
+    std::vector<std::pair<std::string, std::string>> once_environment_vars_;
 
-    Subcontext* subcontext_;
+    const Subcontext* const subcontext_;
     Action onrestart_;  // Commands to execute on restart.
 
     std::vector<std::string> writepid_files_;
@@ -216,17 +217,17 @@
 
     bool updatable_ = false;
 
-    std::vector<std::string> args_;
+    const std::vector<std::string> args_;
 
     std::vector<std::function<void(const siginfo_t& siginfo)>> reap_callbacks_;
 
-    bool use_bootstrap_ns_ = false;
+    std::optional<MountNamespace> mount_namespace_;
 
     bool post_data_ = false;
 
     std::optional<std::string> on_failure_reboot_target_;
 
-    bool from_apex_ = false;
+    std::string filename_;
 };
 
 }  // namespace init
diff --git a/init/service_list.cpp b/init/service_list.cpp
index 3047821..937d82e 100644
--- a/init/service_list.cpp
+++ b/init/service_list.cpp
@@ -24,8 +24,8 @@
 ServiceList::ServiceList() {}
 
 ServiceList& ServiceList::GetInstance() {
-    static ServiceList instance;
-    return instance;
+    static ServiceList* instance = new ServiceList;
+    return *instance;
 }
 
 size_t ServiceList::CheckAllCommands() {
diff --git a/init/service_list.h b/init/service_list.h
index 555da25..f858bc3 100644
--- a/init/service_list.h
+++ b/init/service_list.h
@@ -16,10 +16,14 @@
 
 #pragma once
 
+#include <iterator>
 #include <memory>
 #include <vector>
 
+#include <android-base/logging.h>
+
 #include "service.h"
+#include "util.h"
 
 namespace android {
 namespace init {
@@ -52,6 +56,17 @@
         return nullptr;
     }
 
+    std::vector<Service*> FindServicesByApexName(const std::string& apex_name) const {
+        CHECK(!apex_name.empty()) << "APEX name cannot be empty";
+        std::vector<Service*> matches;
+        for (const auto& svc : services_) {
+            if (GetApexNameFromFileName(svc->filename()) == apex_name) {
+                matches.emplace_back(svc.get());
+            }
+        }
+        return matches;
+    }
+
     Service* FindInterface(const std::string& interface_name) {
         for (const auto& svc : services_) {
             if (svc->interfaces().count(interface_name) > 0) {
@@ -79,6 +94,8 @@
         services_update_finished_ = false;
     }
 
+    auto size() const { return services_.size(); }
+
   private:
     std::vector<std::unique_ptr<Service>> services_;
 
diff --git a/init/service_parser.cpp b/init/service_parser.cpp
index 1ee309d..24a2024 100644
--- a/init/service_parser.cpp
+++ b/init/service_parser.cpp
@@ -650,7 +650,7 @@
         }
     }
 
-    service_ = std::make_unique<Service>(name, restart_action_subcontext, str_args, from_apex_);
+    service_ = std::make_unique<Service>(name, restart_action_subcontext, filename, str_args);
     return {};
 }
 
diff --git a/init/service_parser.h b/init/service_parser.h
index 0fd2da5..54503dd 100644
--- a/init/service_parser.h
+++ b/init/service_parser.h
@@ -31,13 +31,11 @@
   public:
     ServiceParser(
             ServiceList* service_list, Subcontext* subcontext,
-            const std::optional<InterfaceInheritanceHierarchyMap>& interface_inheritance_hierarchy,
-            bool from_apex = false)
+            const std::optional<InterfaceInheritanceHierarchyMap>& interface_inheritance_hierarchy)
         : service_list_(service_list),
           subcontext_(subcontext),
           interface_inheritance_hierarchy_(interface_inheritance_hierarchy),
-          service_(nullptr),
-          from_apex_(from_apex) {}
+          service_(nullptr) {}
     Result<void> ParseSection(std::vector<std::string>&& args, const std::string& filename,
                               int line) override;
     Result<void> ParseLineSection(std::vector<std::string>&& args, int line) override;
@@ -92,7 +90,6 @@
     std::optional<InterfaceInheritanceHierarchyMap> interface_inheritance_hierarchy_;
     std::unique_ptr<Service> service_;
     std::string filename_;
-    bool from_apex_ = false;
 };
 
 }  // namespace init
diff --git a/init/service_test.cpp b/init/service_test.cpp
index 22ee844..87a2ce5 100644
--- a/init/service_test.cpp
+++ b/init/service_test.cpp
@@ -39,7 +39,7 @@
 
     std::vector<std::string> dummy_args{"/bin/test"};
     Service* service_in_old_memory =
-        new (old_memory) Service("test_old_memory", nullptr, dummy_args);
+        new (old_memory) Service("test_old_memory", nullptr, /*filename=*/"", dummy_args);
 
     EXPECT_EQ(0U, service_in_old_memory->flags());
     EXPECT_EQ(0, service_in_old_memory->pid());
@@ -58,7 +58,8 @@
     }
 
     Service* service_in_old_memory2 = new (old_memory) Service(
-            "test_old_memory", 0U, 0U, 0U, std::vector<gid_t>(), 0U, "", nullptr, dummy_args);
+            "test_old_memory", 0U, 0U, 0U, std::vector<gid_t>(), 0U, "",
+            nullptr, /*filename=*/"", dummy_args);
 
     EXPECT_EQ(0U, service_in_old_memory2->flags());
     EXPECT_EQ(0, service_in_old_memory2->pid());
diff --git a/init/service_utils.cpp b/init/service_utils.cpp
index d19f5ee..7004d8d 100644
--- a/init/service_utils.cpp
+++ b/init/service_utils.cpp
@@ -52,7 +52,7 @@
     if (fd == -1) {
         return ErrnoError() << "Could not open namespace at " << path;
     }
-    if (setns(fd, nstype) == -1) {
+    if (setns(fd.get(), nstype) == -1) {
         return ErrnoError() << "Could not setns() namespace at " << path;
     }
     return {};
@@ -127,22 +127,22 @@
 
 void SetupStdio(bool stdio_to_kmsg) {
     auto fd = unique_fd{open("/dev/null", O_RDWR | O_CLOEXEC)};
-    dup2(fd, STDIN_FILENO);
+    dup2(fd.get(), STDIN_FILENO);
     if (stdio_to_kmsg) {
         fd.reset(open("/dev/kmsg_debug", O_WRONLY | O_CLOEXEC));
         if (fd == -1) fd.reset(open("/dev/null", O_WRONLY | O_CLOEXEC));
     }
-    dup2(fd, STDOUT_FILENO);
-    dup2(fd, STDERR_FILENO);
+    dup2(fd.get(), STDOUT_FILENO);
+    dup2(fd.get(), STDERR_FILENO);
 }
 
 void OpenConsole(const std::string& console) {
     auto fd = unique_fd{open(console.c_str(), O_RDWR | O_CLOEXEC)};
     if (fd == -1) fd.reset(open("/dev/null", O_RDWR | O_CLOEXEC));
-    ioctl(fd, TIOCSCTTY, 0);
-    dup2(fd, 0);
-    dup2(fd, 1);
-    dup2(fd, 2);
+    ioctl(fd.get(), TIOCSCTTY, 0);
+    dup2(fd.get(), 0);
+    dup2(fd.get(), 1);
+    dup2(fd.get(), 2);
 }
 
 }  // namespace
@@ -190,7 +190,7 @@
     }
 
     // Fixup as we set O_NONBLOCK for open, the intent for fd is to block reads.
-    fcntl(fd, F_SETFL, flags);
+    fcntl(fd.get(), F_SETFL, flags);
 
     return Descriptor(ANDROID_FILE_ENV_PREFIX + name, std::move(fd));
 }
@@ -232,7 +232,7 @@
     return {};
 }
 
-Result<void> SetProcessAttributes(const ProcessAttributes& attr) {
+Result<void> SetProcessAttributes(const ProcessAttributes& attr, InterprocessFifo setsid_finished) {
     if (attr.ioprio_class != IoSchedClass_NONE) {
         if (android_set_ioprio(getpid(), attr.ioprio_class, attr.ioprio_pri)) {
             PLOG(ERROR) << "failed to set pid " << getpid() << " ioprio=" << attr.ioprio_class
@@ -240,11 +240,17 @@
         }
     }
 
-    if (!attr.console.empty()) {
+    if (RequiresConsole(attr)) {
         setsid();
+        setsid_finished.Write(kSetSidFinished);
+        setsid_finished.Close();
         OpenConsole(attr.console);
     } else {
-        if (setpgid(0, getpid()) == -1) {
+        // Without PID namespaces, this call duplicates the setpgid() call from
+        // the parent process. With PID namespaces, this setpgid() call sets the
+        // process group ID for a child of the init process in the PID
+        // namespace.
+        if (setpgid(0, 0) == -1) {
             return ErrnoError() << "setpgid failed";
         }
         SetupStdio(attr.stdio_to_kmsg);
@@ -280,6 +286,15 @@
 }
 
 Result<void> WritePidToFiles(std::vector<std::string>* files) {
+    if (files->empty()) {
+        // No files to write pid to, exit early.
+        return {};
+    }
+
+    if (!CgroupsAvailable()) {
+        return Error() << "cgroups are not available";
+    }
+
     // See if there were "writepid" instructions to write to files under cpuset path.
     std::string cpuset_path;
     if (CgroupGetControllerPath("cpuset", &cpuset_path)) {
diff --git a/init/service_utils.h b/init/service_utils.h
index 65a2012..d4143aa 100644
--- a/init/service_utils.h
+++ b/init/service_utils.h
@@ -26,12 +26,20 @@
 #include <android-base/unique_fd.h>
 #include <cutils/iosched_policy.h>
 
+#include "interprocess_fifo.h"
 #include "mount_namespace.h"
 #include "result.h"
 
 namespace android {
 namespace init {
 
+// Constants used by Service::Start() for communication between parent and child.
+enum ServiceCode : uint8_t {
+    kActivatingCgroupsFailed,
+    kCgroupsActivated,
+    kSetSidFinished,
+};
+
 class Descriptor {
   public:
     Descriptor(const std::string& name, android::base::unique_fd fd)
@@ -89,7 +97,12 @@
     int priority;
     bool stdio_to_kmsg;
 };
-Result<void> SetProcessAttributes(const ProcessAttributes& attr);
+
+inline bool RequiresConsole(const ProcessAttributes& attr) {
+    return !attr.console.empty();
+}
+
+Result<void> SetProcessAttributes(const ProcessAttributes& attr, InterprocessFifo setsid_finished);
 
 Result<void> WritePidToFiles(std::vector<std::string>* files);
 
diff --git a/init/sigchld_handler.cpp b/init/sigchld_handler.cpp
index 6fc64df..f8c501f 100644
--- a/init/sigchld_handler.cpp
+++ b/init/sigchld_handler.cpp
@@ -24,6 +24,7 @@
 #include <unistd.h>
 
 #include <android-base/chrono_utils.h>
+#include <android-base/file.h>
 #include <android-base/logging.h>
 #include <android-base/scopeguard.h>
 #include <android-base/stringprintf.h>
@@ -36,6 +37,7 @@
 
 using android::base::boot_clock;
 using android::base::make_scope_guard;
+using android::base::ReadFileToString;
 using android::base::StringPrintf;
 using android::base::Timer;
 
@@ -51,8 +53,13 @@
         return 0;
     }
 
-    auto pid = siginfo.si_pid;
-    if (pid == 0) return 0;
+    const pid_t pid = siginfo.si_pid;
+    if (pid == 0) {
+        DCHECK_EQ(siginfo.si_signo, 0);
+        return 0;
+    }
+
+    DCHECK_EQ(siginfo.si_signo, SIGCHLD);
 
     // At this point we know we have a zombie pid, so we use this scopeguard to reap the pid
     // whenever the function returns from this point forward.
@@ -132,6 +139,11 @@
     }
     LOG(INFO) << "Waiting for " << pids.size() << " pids to be reaped took " << t << " with "
               << alive_pids.size() << " of them still running";
+    for (pid_t pid : pids) {
+        std::string status = "(no-such-pid)";
+        ReadFileToString(StringPrintf("/proc/%d/status", pid), &status);
+        LOG(INFO) << "Still running: " << pid << ' ' << status;
+    }
 }
 
 }  // namespace init
diff --git a/init/snapuserd_transition.cpp b/init/snapuserd_transition.cpp
index 5c821b0..6972f30 100644
--- a/init/snapuserd_transition.cpp
+++ b/init/snapuserd_transition.cpp
@@ -226,12 +226,9 @@
 
     argv_.emplace_back("snapuserd");
     argv_.emplace_back("-no_socket");
-    if (!sm_->DetachSnapuserdForSelinux(&argv_)) {
+    if (!sm_->PrepareSnapuserdArgsForSelinux(&argv_)) {
         LOG(FATAL) << "Could not perform selinux transition";
     }
-
-    // Make sure the process is gone so we don't have any selinux audits.
-    KillFirstStageSnapuserd(old_pid_);
 }
 
 void SnapuserdSelinuxHelper::FinishTransition() {
@@ -301,6 +298,12 @@
 }
 
 void SnapuserdSelinuxHelper::RelaunchFirstStageSnapuserd() {
+    if (!sm_->DetachFirstStageSnapuserdForSelinux()) {
+        LOG(FATAL) << "Could not perform selinux transition";
+    }
+
+    KillFirstStageSnapuserd(old_pid_);
+
     auto fd = GetRamdiskSnapuserdFd();
     if (!fd) {
         LOG(FATAL) << "Environment variable " << kSnapuserdFirstStageFdVar << " was not set!";
diff --git a/init/subcontext.cpp b/init/subcontext.cpp
index 7aa4a9d..6a095fb 100644
--- a/init/subcontext.cpp
+++ b/init/subcontext.cpp
@@ -207,7 +207,7 @@
 
         // We explicitly do not use O_CLOEXEC here, such that we can reference this FD by number
         // in the subcontext process after we exec.
-        int child_fd = dup(subcontext_socket);  // NOLINT(android-cloexec-dup)
+        int child_fd = dup(subcontext_socket.get());  // NOLINT(android-cloexec-dup)
         if (child_fd < 0) {
             PLOG(FATAL) << "Could not dup child_fd";
         }
@@ -250,7 +250,11 @@
     Fork();
 }
 
-bool Subcontext::PathMatchesSubcontext(const std::string& path) {
+bool Subcontext::PathMatchesSubcontext(const std::string& path) const {
+    auto apex_name = GetApexNameFromFileName(path);
+    if (!apex_name.empty()) {
+        return std::find(apex_list_.begin(), apex_list_.end(), apex_name) != apex_list_.end();
+    }
     for (const auto& prefix : path_prefixes_) {
         if (StartsWith(path, prefix)) {
             return true;
@@ -259,13 +263,17 @@
     return false;
 }
 
+void Subcontext::SetApexList(std::vector<std::string>&& apex_list) {
+    apex_list_ = std::move(apex_list);
+}
+
 Result<SubcontextReply> Subcontext::TransmitMessage(const SubcontextCommand& subcontext_command) {
-    if (auto result = SendMessage(socket_, subcontext_command); !result.ok()) {
+    if (auto result = SendMessage(socket_.get(), subcontext_command); !result.ok()) {
         Restart();
         return ErrnoError() << "Failed to send message to subcontext";
     }
 
-    auto subcontext_message = ReadMessage(socket_);
+    auto subcontext_message = ReadMessage(socket_.get());
     if (!subcontext_message.ok()) {
         Restart();
         return Error() << "Failed to receive result from subcontext: " << subcontext_message.error();
@@ -370,6 +378,9 @@
 }
 
 void SubcontextTerminate() {
+    if (!subcontext) {
+        return;
+    }
     subcontext_terminated_by_shutdown = true;
     kill(subcontext->pid(), SIGTERM);
 }
diff --git a/init/subcontext.h b/init/subcontext.h
index cb4138e..93ebace 100644
--- a/init/subcontext.h
+++ b/init/subcontext.h
@@ -36,8 +36,10 @@
 
 class Subcontext {
   public:
-    Subcontext(std::vector<std::string> path_prefixes, std::string context, bool host = false)
-        : path_prefixes_(std::move(path_prefixes)), context_(std::move(context)), pid_(0) {
+    Subcontext(std::vector<std::string> path_prefixes, std::string_view context, bool host = false)
+        : path_prefixes_(std::move(path_prefixes)),
+          context_(context.begin(), context.end()),
+          pid_(0) {
         if (!host) {
             Fork();
         }
@@ -46,7 +48,8 @@
     Result<void> Execute(const std::vector<std::string>& args);
     Result<std::vector<std::string>> ExpandArgs(const std::vector<std::string>& args);
     void Restart();
-    bool PathMatchesSubcontext(const std::string& path);
+    bool PathMatchesSubcontext(const std::string& path) const;
+    void SetApexList(std::vector<std::string>&& apex_list);
 
     const std::string& context() const { return context_; }
     pid_t pid() const { return pid_; }
@@ -56,6 +59,7 @@
     Result<SubcontextReply> TransmitMessage(const SubcontextCommand& subcontext_command);
 
     std::vector<std::string> path_prefixes_;
+    std::vector<std::string> apex_list_;
     std::string context_;
     pid_t pid_;
     android::base::unique_fd socket_;
diff --git a/init/test_upgrade_mte/Android.bp b/init/test_upgrade_mte/Android.bp
new file mode 100644
index 0000000..1bfc76c
--- /dev/null
+++ b/init/test_upgrade_mte/Android.bp
@@ -0,0 +1,41 @@
+// Copyright (C) 2022 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package {
+    default_applicable_licenses: ["system_core_init_license"],
+}
+
+cc_binary {
+  name: "mte_upgrade_test_helper",
+  srcs: ["mte_upgrade_test_helper.cpp"],
+  sanitize: {
+    memtag_heap: true,
+    diag: {
+      memtag_heap: false,
+    },
+  },
+  init_rc: [
+    "mte_upgrade_test.rc",
+  ],
+}
+
+java_test_host {
+    name: "mte_upgrade_test",
+    libs: ["tradefed"],
+    static_libs: ["frameworks-base-hostutils", "cts-install-lib-host"],
+    srcs:  ["src/**/MteUpgradeTest.java", ":libtombstone_proto-src"],
+    data: [":mte_upgrade_test_helper", "mte_upgrade_test.rc" ],
+    test_config: "AndroidTest.xml",
+    test_suites: ["general-tests"],
+}
diff --git a/init/test_upgrade_mte/AndroidTest.xml b/init/test_upgrade_mte/AndroidTest.xml
new file mode 100644
index 0000000..b89cde8
--- /dev/null
+++ b/init/test_upgrade_mte/AndroidTest.xml
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2022 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<configuration description="Runs the MTE upgrade tests">
+    <option name="test-suite-tag" value="init_test_upgrade_mte" />
+    <option name="test-suite-tag" value="apct" />
+    <target_preparer class="com.android.tradefed.targetprep.RootTargetPreparer"/>
+    <target_preparer class="com.android.tradefed.targetprep.PushFilePreparer">
+      <option name="cleanup" value="true" />
+      <option name="remount-system" value="true" />
+      <option name="push" value="mte_upgrade_test.rc->/system/etc/init/mte_upgrade_test.rc" />
+      <option name="push" value="mte_upgrade_test_helper->/system/bin/mte_upgrade_test_helper" />
+      <option name="push" value="mte_upgrade_test_helper->/data/local/tmp/app_process64" />
+    </target_preparer>
+    <test class="com.android.tradefed.testtype.HostTest" >
+        <option name="jar" value="mte_upgrade_test.jar" />
+    </test>
+</configuration>
\ No newline at end of file
diff --git a/init/test_upgrade_mte/mte_upgrade_test.rc b/init/test_upgrade_mte/mte_upgrade_test.rc
new file mode 100644
index 0000000..a3e596c
--- /dev/null
+++ b/init/test_upgrade_mte/mte_upgrade_test.rc
@@ -0,0 +1,24 @@
+# Copyright (C) 2022 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+service mte_upgrade_test_helper /system/bin/mte_upgrade_test_helper ${sys.mte_crash_test_uuid}
+  class late_start
+  disabled
+  seclabel u:r:su:s0
+
+service mte_upgrade_test_helper_overridden /system/bin/mte_upgrade_test_helper ${sys.mte_crash_test_uuid}
+  class late_start
+  disabled
+  seclabel u:r:su:s0
+  setenv BIONIC_MEMTAG_UPGRADE_SECS 0
diff --git a/init/test_upgrade_mte/mte_upgrade_test_helper.cpp b/init/test_upgrade_mte/mte_upgrade_test_helper.cpp
new file mode 100644
index 0000000..3188337
--- /dev/null
+++ b/init/test_upgrade_mte/mte_upgrade_test_helper.cpp
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <linux/prctl.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/prctl.h>
+#include <time.h>
+#include <unistd.h>
+#include <memory>
+
+int MaybeDowngrade() {
+    int res = prctl(PR_GET_TAGGED_ADDR_CTRL, 0, 0, 0, 0);
+    if (res == -1) return 1;
+    if (static_cast<unsigned long>(res) & PR_MTE_TCF_ASYNC) return 2;
+    time_t t = time(nullptr);
+    while (time(nullptr) - t < 100) {
+        res = prctl(PR_GET_TAGGED_ADDR_CTRL, 0, 0, 0, 0);
+        if (static_cast<unsigned long>(res) & PR_MTE_TCF_ASYNC) {
+            return 0;
+        }
+        sleep(1);
+    }
+    return 3;
+}
+
+int main(int argc, char** argv) {
+    if (argc == 2 && strcmp(argv[1], "--check-downgrade") == 0) {
+        return MaybeDowngrade();
+    }
+    int res = prctl(PR_GET_TAGGED_ADDR_CTRL, 0, 0, 0, 0);
+    if (res == -1) abort();
+    if (argc == 2 && strcmp(argv[1], "--get-mode") == 0) {
+        if (res & PR_MTE_TCF_ASYNC) {
+            return 1;
+        }
+        if (res & PR_MTE_TCF_SYNC) {
+            return 2;
+        }
+        abort();
+    }
+
+    if (res & PR_MTE_TCF_ASYNC && res & PR_MTE_TCF_SYNC) {
+        // Disallow automatic upgrade from ASYNC mode.
+        if (prctl(PR_SET_TAGGED_ADDR_CTRL, res & ~PR_MTE_TCF_SYNC, 0, 0, 0) == -1) abort();
+    }
+    std::unique_ptr<volatile char[]> f(new char[1]);
+    f[17] = 'x';
+    char buf[1];
+    read(1, buf, 1);
+    return 0;
+}
diff --git a/init/test_upgrade_mte/src/com/android/tests/init/MteUpgradeTest.java b/init/test_upgrade_mte/src/com/android/tests/init/MteUpgradeTest.java
new file mode 100644
index 0000000..f4e4a9c
--- /dev/null
+++ b/init/test_upgrade_mte/src/com/android/tests/init/MteUpgradeTest.java
@@ -0,0 +1,151 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.tests.init;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.junit.Assume.assumeTrue;
+
+import com.android.server.os.TombstoneProtos.Tombstone;
+import com.android.tradefed.testtype.DeviceJUnit4ClassRunner;
+import com.android.tradefed.testtype.junit4.BaseHostJUnit4Test;
+import com.android.tradefed.util.CommandResult;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.InputStream;
+import java.util.ArrayList;
+
+@RunWith(DeviceJUnit4ClassRunner.class)
+public class MteUpgradeTest extends BaseHostJUnit4Test {
+    @Before
+    public void setUp() throws Exception {
+        CommandResult result =
+                getDevice().executeShellV2Command("/system/bin/mte_upgrade_test_helper --checking");
+        assumeTrue("mte_upgrade_test_binary needs to segfault", result.getExitCode() == 139);
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        // Easier here than in a finally in testCrash, and doesn't really hurt.
+        getDevice().executeShellV2Command("stop mte_upgrade_test_helper");
+        getDevice().executeShellV2Command("stop mte_upgrade_test_helper_overridden");
+        getDevice().setProperty("sys.mte_crash_test_uuid", "");
+    }
+
+    Tombstone parseTombstone(String tombstonePath) throws Exception {
+        File tombstoneFile = getDevice().pullFile(tombstonePath);
+        InputStream istr = new FileInputStream(tombstoneFile);
+        Tombstone tombstoneProto;
+        try {
+            tombstoneProto = Tombstone.parseFrom(istr);
+        } finally {
+            istr.close();
+        }
+        return tombstoneProto;
+    }
+
+    @Test
+    public void testCrash() throws Exception {
+        String uuid = java.util.UUID.randomUUID().toString();
+        getDevice().reboot();
+        assertThat(getDevice().setProperty("sys.mte_crash_test_uuid", uuid)).isTrue();
+
+        CommandResult result = getDevice().executeShellV2Command("start mte_upgrade_test_helper");
+        assertThat(result.getExitCode()).isEqualTo(0);
+        java.lang.Thread.sleep(20000);
+        String[] tombstonesAfter = getDevice().getChildren("/data/tombstones");
+        ArrayList<String> segvCodeNames = new ArrayList<String>();
+        for (String tombstone : tombstonesAfter) {
+            if (!tombstone.endsWith(".pb")) {
+                continue;
+            }
+            String tombstoneFilename = "/data/tombstones/" + tombstone;
+            Tombstone tombstoneProto = parseTombstone(tombstoneFilename);
+            if (!tombstoneProto.getCommandLineList().stream().anyMatch(x -> x.contains(uuid))) {
+                continue;
+            }
+            assertThat(tombstoneProto.getSignalInfo().getName()).isEqualTo("SIGSEGV");
+            segvCodeNames.add(tombstoneProto.getSignalInfo().getCodeName());
+            getDevice().deleteFile(tombstoneFilename);
+            // remove the non .pb file as well.
+            getDevice().deleteFile(tombstoneFilename.substring(0, tombstoneFilename.length() - 3));
+        }
+        assertThat(segvCodeNames.size()).isAtLeast(3);
+        assertThat(segvCodeNames.get(0)).isEqualTo("SEGV_MTEAERR");
+        assertThat(segvCodeNames.get(1)).isEqualTo("SEGV_MTESERR");
+        assertThat(segvCodeNames.get(2)).isEqualTo("SEGV_MTEAERR");
+    }
+
+    @Test
+    public void testCrashOverridden() throws Exception {
+        String uuid = java.util.UUID.randomUUID().toString();
+        getDevice().reboot();
+        assertThat(getDevice().setProperty("sys.mte_crash_test_uuid", uuid)).isTrue();
+
+        CommandResult result =
+                getDevice().executeShellV2Command("start mte_upgrade_test_helper_overridden");
+        assertThat(result.getExitCode()).isEqualTo(0);
+        java.lang.Thread.sleep(20000);
+        String[] tombstonesAfter = getDevice().getChildren("/data/tombstones");
+        ArrayList<String> segvCodeNames = new ArrayList<String>();
+        for (String tombstone : tombstonesAfter) {
+            if (!tombstone.endsWith(".pb")) {
+                continue;
+            }
+            String tombstoneFilename = "/data/tombstones/" + tombstone;
+            Tombstone tombstoneProto = parseTombstone(tombstoneFilename);
+            if (!tombstoneProto.getCommandLineList().stream().anyMatch(x -> x.contains(uuid))) {
+                continue;
+            }
+            assertThat(tombstoneProto.getSignalInfo().getName()).isEqualTo("SIGSEGV");
+            segvCodeNames.add(tombstoneProto.getSignalInfo().getCodeName());
+            getDevice().deleteFile(tombstoneFilename);
+            // remove the non .pb file as well.
+            getDevice().deleteFile(tombstoneFilename.substring(0, tombstoneFilename.length() - 3));
+        }
+        assertThat(segvCodeNames.size()).isAtLeast(3);
+        assertThat(segvCodeNames.get(0)).isEqualTo("SEGV_MTEAERR");
+        assertThat(segvCodeNames.get(1)).isEqualTo("SEGV_MTEAERR");
+        assertThat(segvCodeNames.get(2)).isEqualTo("SEGV_MTEAERR");
+    }
+
+    @Test
+    public void testDowngrade() throws Exception {
+        CommandResult result =
+                getDevice()
+                        .executeShellV2Command(
+                                "MEMTAG_OPTIONS=async BIONIC_MEMTAG_UPGRADE_SECS=5"
+                                        + " /system/bin/mte_upgrade_test_helper --check-downgrade");
+        assertThat(result.getExitCode()).isEqualTo(0);
+    }
+
+    @Test
+    public void testAppProcess() throws Exception {
+        CommandResult result =
+                getDevice()
+                        .executeShellV2Command(
+                                "MEMTAG_OPTIONS=async BIONIC_MEMTAG_UPGRADE_SECS=5"
+                                        + " /data/local/tmp/app_process64 --get-mode");
+        assertThat(result.getExitCode()).isEqualTo(1);  // ASYNC
+    }
+}
diff --git a/init/uevent_listener.cpp b/init/uevent_listener.cpp
index 7cd396a..5da6777 100644
--- a/init/uevent_listener.cpp
+++ b/init/uevent_listener.cpp
@@ -92,12 +92,12 @@
         LOG(FATAL) << "Could not open uevent socket";
     }
 
-    fcntl(device_fd_, F_SETFL, O_NONBLOCK);
+    fcntl(device_fd_.get(), F_SETFL, O_NONBLOCK);
 }
 
 ReadUeventResult UeventListener::ReadUevent(Uevent* uevent) const {
     char msg[UEVENT_MSG_LEN + 2];
-    int n = uevent_kernel_multicast_recv(device_fd_, msg, UEVENT_MSG_LEN);
+    int n = uevent_kernel_multicast_recv(device_fd_.get(), msg, UEVENT_MSG_LEN);
     if (n <= 0) {
         if (errno != EAGAIN && errno != EWOULDBLOCK) {
             PLOG(ERROR) << "Error reading from Uevent Fd";
@@ -184,9 +184,10 @@
                           const std::optional<std::chrono::milliseconds> relative_timeout) const {
     using namespace std::chrono;
 
-    pollfd ufd;
-    ufd.events = POLLIN;
-    ufd.fd = device_fd_;
+    pollfd ufd = {
+            .events = POLLIN,
+            .fd = device_fd_.get(),
+    };
 
     auto start_time = steady_clock::now();
 
diff --git a/init/ueventd.cpp b/init/ueventd.cpp
index c6bf708..586e2cf 100644
--- a/init/ueventd.cpp
+++ b/init/ueventd.cpp
@@ -298,21 +298,31 @@
 
 static UeventdConfiguration GetConfiguration() {
     auto hardware = android::base::GetProperty("ro.hardware", "");
-    std::vector<std::string> legacy_paths{"/vendor/ueventd.rc", "/odm/ueventd.rc",
-                                          "/ueventd." + hardware + ".rc"};
+
+    struct LegacyPathInfo {
+        std::string legacy_path;
+        std::string preferred;
+    };
+    std::vector<LegacyPathInfo> legacy_paths{
+            {"/vendor/ueventd.rc", "/vendor/etc/ueventd.rc"},
+            {"/odm/ueventd.rc", "/odm/etc/ueventd.rc"},
+            {"/ueventd." + hardware + ".rc", "another ueventd.rc file"}};
 
     std::vector<std::string> canonical{"/system/etc/ueventd.rc"};
 
     if (android::base::GetIntProperty("ro.product.first_api_level", 10000) < __ANDROID_API_T__) {
         // TODO: Remove these legacy paths once Android S is no longer supported.
-        canonical.insert(canonical.end(), legacy_paths.begin(), legacy_paths.end());
+        for (const auto& info : legacy_paths) {
+            canonical.push_back(info.legacy_path);
+        }
     } else {
         // Warn if newer device is using legacy paths.
-        for (const auto& path : legacy_paths) {
-            if (access(path.c_str(), F_OK) == 0) {
+        for (const auto& info : legacy_paths) {
+            if (access(info.legacy_path.c_str(), F_OK) == 0) {
                 LOG(FATAL_WITHOUT_ABORT)
                         << "Legacy ueventd configuration file detected and will not be parsed: "
-                        << path;
+                        << info.legacy_path << ". Please move your configuration to "
+                        << info.preferred << " instead.";
             }
         }
     }
diff --git a/init/util.cpp b/init/util.cpp
index 5b3a73c..bc8ea6e 100644
--- a/init/util.cpp
+++ b/init/util.cpp
@@ -30,6 +30,7 @@
 #include <time.h>
 #include <unistd.h>
 
+#include <map>
 #include <thread>
 
 #include <android-base/file.h>
@@ -61,6 +62,8 @@
 
 const std::string kDefaultAndroidDtDir("/proc/device-tree/firmware/android/");
 
+const std::string kDataDirPrefix("/data/");
+
 void (*trigger_shutdown)(const std::string& command) = nullptr;
 
 // DecodeUid() - decodes and returns the given string, which can be either the
@@ -117,12 +120,12 @@
 
     if (passcred) {
         int on = 1;
-        if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on))) {
+        if (setsockopt(fd.get(), SOL_SOCKET, SO_PASSCRED, &on, sizeof(on))) {
             return ErrnoError() << "Failed to set SO_PASSCRED '" << name << "'";
         }
     }
 
-    int ret = bind(fd, (struct sockaddr *) &addr, sizeof (addr));
+    int ret = bind(fd.get(), (struct sockaddr*)&addr, sizeof(addr));
     int savederrno = errno;
 
     if (!secontext.empty()) {
@@ -142,7 +145,7 @@
     if (fchmodat(AT_FDCWD, addr.sun_path, perm, AT_SYMLINK_NOFOLLOW)) {
         return ErrnoError() << "Failed to fchmodat socket '" << addr.sun_path << "'";
     }
-    if (should_listen && listen(fd, /* use OS maximum */ 1 << 30)) {
+    if (should_listen && listen(fd.get(), /* use OS maximum */ 1 << 30)) {
         return ErrnoError() << "Failed to listen on socket '" << addr.sun_path << "'";
     }
 
@@ -165,7 +168,7 @@
     // For security reasons, disallow world-writable
     // or group-writable files.
     struct stat sb;
-    if (fstat(fd, &sb) == -1) {
+    if (fstat(fd.get(), &sb) == -1) {
         return ErrnoError() << "fstat failed()";
     }
     if ((sb.st_mode & (S_IWGRP | S_IWOTH)) != 0) {
@@ -461,58 +464,34 @@
     return {};
 }
 
-static FscryptAction FscryptInferAction(const std::string& dir) {
-    const std::string prefix = "/data/";
-
-    if (!android::base::StartsWith(dir, prefix)) {
-        return FscryptAction::kNone;
-    }
-
-    // Special-case /data/media/obb per b/64566063
-    if (dir == "/data/media/obb") {
-        // Try to set policy on this directory, but if it is non-empty this may fail.
-        return FscryptAction::kAttempt;
-    }
-
-    // Only set policy on first level /data directories
-    // To make this less restrictive, consider using a policy file.
-    // However this is overkill for as long as the policy is simply
-    // to apply a global policy to all /data folders created via makedir
-    if (dir.find_first_of('/', prefix.size()) != std::string::npos) {
-        return FscryptAction::kNone;
-    }
-
-    // Special case various directories that must not be encrypted,
-    // often because their subdirectories must be encrypted.
-    // This isn't a nice way to do this, see b/26641735
-    std::vector<std::string> directories_to_exclude = {
-            "lost+found", "system_ce", "system_de", "misc_ce",     "misc_de",
-            "vendor_ce",  "vendor_de", "media",     "data",        "user",
-            "user_de",    "apex",      "preloads",  "app-staging", "gsi",
-    };
-    for (const auto& d : directories_to_exclude) {
-        if ((prefix + d) == dir) {
-            return FscryptAction::kNone;
+// Remove unnecessary slashes so that any later checks (e.g., the check for
+// whether the path is a top-level directory in /data) don't get confused.
+std::string CleanDirPath(const std::string& path) {
+    std::string result;
+    result.reserve(path.length());
+    // Collapse duplicate slashes, e.g. //data//foo// => /data/foo/
+    for (char c : path) {
+        if (c != '/' || result.empty() || result.back() != '/') {
+            result += c;
         }
     }
-    // Empty these directories if policy setting fails.
-    std::vector<std::string> wipe_on_failure = {
-            "rollback", "rollback-observer",  // b/139193659
-    };
-    for (const auto& d : wipe_on_failure) {
-        if ((prefix + d) == dir) {
-            return FscryptAction::kDeleteIfNecessary;
-        }
+    // Remove trailing slash, e.g. /data/foo/ => /data/foo
+    if (result.length() > 1 && result.back() == '/') {
+        result.pop_back();
     }
-    return FscryptAction::kRequire;
+    return result;
 }
 
 Result<MkdirOptions> ParseMkdir(const std::vector<std::string>& args) {
+    std::string path = CleanDirPath(args[1]);
+    const bool is_toplevel_data_dir =
+            StartsWith(path, kDataDirPrefix) &&
+            path.find_first_of('/', kDataDirPrefix.size()) == std::string::npos;
+    FscryptAction fscrypt_action =
+            is_toplevel_data_dir ? FscryptAction::kRequire : FscryptAction::kNone;
     mode_t mode = 0755;
     Result<uid_t> uid = -1;
     Result<gid_t> gid = -1;
-    FscryptAction fscrypt_inferred_action = FscryptInferAction(args[1]);
-    FscryptAction fscrypt_action = fscrypt_inferred_action;
     std::string ref_option = "ref";
     bool set_option_encryption = false;
     bool set_option_key = false;
@@ -577,24 +556,17 @@
     if (set_option_key && fscrypt_action == FscryptAction::kNone) {
         return Error() << "Key option set but encryption action is none";
     }
-    const std::string prefix = "/data/";
-    if (StartsWith(args[1], prefix) &&
-        args[1].find_first_of('/', prefix.size()) == std::string::npos) {
+    if (is_toplevel_data_dir) {
         if (!set_option_encryption) {
-            LOG(WARNING) << "Top-level directory needs encryption action, eg mkdir " << args[1]
+            LOG(WARNING) << "Top-level directory needs encryption action, eg mkdir " << path
                          << " <mode> <uid> <gid> encryption=Require";
         }
         if (fscrypt_action == FscryptAction::kNone) {
-            LOG(INFO) << "Not setting encryption policy on: " << args[1];
+            LOG(INFO) << "Not setting encryption policy on: " << path;
         }
     }
-    if (fscrypt_action != fscrypt_inferred_action) {
-        LOG(WARNING) << "Inferred action different from explicit one, expected "
-                     << static_cast<int>(fscrypt_inferred_action) << " but got "
-                     << static_cast<int>(fscrypt_action);
-    }
 
-    return MkdirOptions{args[1], mode, *uid, *gid, fscrypt_action, ref_option};
+    return MkdirOptions{path, mode, *uid, *gid, fscrypt_action, ref_option};
 }
 
 Result<MountAllOptions> ParseMountAll(const std::vector<std::string>& args) {
@@ -765,5 +737,72 @@
     return is_microdroid;
 }
 
+bool Has32BitAbi() {
+    static bool has = !android::base::GetProperty("ro.product.cpu.abilist32", "").empty();
+    return has;
+}
+
+std::string GetApexNameFromFileName(const std::string& path) {
+    static const std::string kApexDir = "/apex/";
+    if (StartsWith(path, kApexDir)) {
+        auto begin = kApexDir.size();
+        auto end = path.find('/', begin);
+        return path.substr(begin, end - begin);
+    }
+    return "";
+}
+
+std::vector<std::string> FilterVersionedConfigs(const std::vector<std::string>& configs,
+                                                int active_sdk) {
+    std::vector<std::string> filtered_configs;
+
+    std::map<std::string, std::pair<std::string, int>> script_map;
+    for (const auto& c : configs) {
+        int sdk = 0;
+        const std::vector<std::string> parts = android::base::Split(c, ".");
+        std::string base;
+        if (parts.size() < 2) {
+            continue;
+        }
+
+        // parts[size()-1], aka the suffix, should be "rc" or "#rc"
+        // any other pattern gets discarded
+
+        const auto& suffix = parts[parts.size() - 1];
+        if (suffix == "rc") {
+            sdk = 0;
+        } else {
+            char trailer[9] = {0};
+            int r = sscanf(suffix.c_str(), "%d%8s", &sdk, trailer);
+            if (r != 2) {
+                continue;
+            }
+            if (strlen(trailer) > 2 || strcmp(trailer, "rc") != 0) {
+                continue;
+            }
+        }
+
+        if (sdk < 0 || sdk > active_sdk) {
+            continue;
+        }
+
+        base = parts[0];
+        for (unsigned int i = 1; i < parts.size() - 1; i++) {
+            base = base + "." + parts[i];
+        }
+
+        // is this preferred over what we already have
+        auto it = script_map.find(base);
+        if (it == script_map.end() || it->second.second < sdk) {
+            script_map[base] = std::make_pair(c, sdk);
+        }
+    }
+
+    for (const auto& m : script_map) {
+        filtered_configs.push_back(m.second.first);
+    }
+    return filtered_configs;
+}
+
 }  // namespace init
 }  // namespace android
diff --git a/init/util.h b/init/util.h
index 1e2eef0..e58e70e 100644
--- a/init/util.h
+++ b/init/util.h
@@ -69,6 +69,7 @@
 
 bool IsLegalPropertyName(const std::string& name);
 Result<void> IsLegalPropertyValue(const std::string& name, const std::string& value);
+std::string CleanDirPath(const std::string& path);
 
 struct MkdirOptions {
     std::string target;
@@ -105,5 +106,14 @@
 void SetDefaultMountNamespaceReady();
 
 bool IsMicrodroid();
+bool Has32BitAbi();
+
+std::string GetApexNameFromFileName(const std::string& path);
+
+// Compare all files */path.#rc and */path.rc with the same path prefix.
+// Keep the one with the highest # that doesn't exceed the system's SDK.
+// (.rc == .0rc for ranking purposes)
+std::vector<std::string> FilterVersionedConfigs(const std::vector<std::string>& configs,
+                                                  int active_sdk);
 }  // namespace init
 }  // namespace android
diff --git a/init/util_test.cpp b/init/util_test.cpp
index 565e7d4..e8144c3 100644
--- a/init/util_test.cpp
+++ b/init/util_test.cpp
@@ -170,5 +170,18 @@
     EXPECT_TRUE(is_dir(path1.c_str()));
 }
 
+TEST(util, CleanDirPath) {
+    EXPECT_EQ("", CleanDirPath(""));
+    EXPECT_EQ("/", CleanDirPath("/"));
+    EXPECT_EQ("/", CleanDirPath("//"));
+    EXPECT_EQ("/foo", CleanDirPath("/foo"));
+    EXPECT_EQ("/foo", CleanDirPath("//foo"));
+    EXPECT_EQ("/foo", CleanDirPath("/foo/"));
+    EXPECT_EQ("/foo/bar", CleanDirPath("/foo/bar"));
+    EXPECT_EQ("/foo/bar", CleanDirPath("/foo/bar/"));
+    EXPECT_EQ("/foo/bar", CleanDirPath("/foo/bar////"));
+    EXPECT_EQ("/foo/bar", CleanDirPath("//foo//bar"));
+}
+
 }  // namespace init
 }  // namespace android
diff --git a/janitors/OWNERS b/janitors/OWNERS
index 3e32c26..d871201 100644
--- a/janitors/OWNERS
+++ b/janitors/OWNERS
@@ -1,6 +1,7 @@
 # OWNERS file for projects that don't really have owners so much as volunteer janitors.
 ccross@google.com
+cferris@google.com
 dwillemsen@google.com
 enh@google.com
-hhb@google.com
 narayan@google.com
+sadafebrahimi@google.com
diff --git a/libcutils/Android.bp b/libcutils/Android.bp
index c8bfb01..b135e57 100644
--- a/libcutils/Android.bp
+++ b/libcutils/Android.bp
@@ -168,6 +168,9 @@
     target: {
         linux_bionic: {
             enabled: true,
+            static_libs: [
+                "libasync_safe",
+            ],
         },
         not_windows: {
             srcs: libcutils_nonwindows_sources + [
@@ -190,6 +193,12 @@
             ],
         },
         android: {
+            sanitize: {
+                misc_undefined: ["integer"],
+            },
+            static_libs: [
+                "libasync_safe",
+            ],
             srcs: libcutils_nonwindows_sources + [
                 "android_reboot.cpp",
                 "ashmem-dev.cpp",
@@ -203,32 +212,6 @@
             ],
         },
 
-        android_arm: {
-            sanitize: {
-                misc_undefined: ["integer"],
-            },
-        },
-        android_arm64: {
-            sanitize: {
-                misc_undefined: ["integer"],
-            },
-        },
-
-        android_x86: {
-            // TODO: This is to work around b/29412086.
-            // Remove once __mulodi4 is available and move the "sanitize" block
-            // to the android target.
-            sanitize: {
-                misc_undefined: [],
-            },
-        },
-
-        android_x86_64: {
-            sanitize: {
-                misc_undefined: ["integer"],
-            },
-        },
-
         // qtaguid.cpp loads libnetd_client.so with dlopen().  Since
         // the interface of libnetd_client.so may vary between AOSP
         // releases, exclude qtaguid.cpp from the VNDK-SP variant.
diff --git a/libcutils/TEST_MAPPING b/libcutils/TEST_MAPPING
index cca7d93..6477502 100644
--- a/libcutils/TEST_MAPPING
+++ b/libcutils/TEST_MAPPING
@@ -4,7 +4,7 @@
       "name": "libcutils_test"
     }
   ],
-  "hwasan-postsubmit": [
+  "hwasan-presubmit": [
     {
       "name": "libcutils_test"
     }
diff --git a/libcutils/ashmem_test.cpp b/libcutils/ashmem_test.cpp
index fb657f6..d158427 100644
--- a/libcutils/ashmem_test.cpp
+++ b/libcutils/ashmem_test.cpp
@@ -75,7 +75,7 @@
     unique_fd fd;
     ASSERT_NO_FATAL_FAILURE(TestCreateRegion(size, fd, PROT_READ | PROT_WRITE));
 
-    void *region1;
+    void* region1 = nullptr;
     ASSERT_NO_FATAL_FAILURE(TestMmap(fd, size, PROT_READ | PROT_WRITE, &region1));
 
     memcpy(region1, &data, size);
@@ -97,7 +97,7 @@
     unique_fd fd;
     ASSERT_NO_FATAL_FAILURE(TestCreateRegion(size, fd, PROT_READ | PROT_WRITE));
 
-    void *region1;
+    void* region1 = nullptr;
     ASSERT_NO_FATAL_FAILURE(TestMmap(fd, size, PROT_READ | PROT_WRITE, &region1));
 
     memcpy(region1, &data, size);
@@ -131,7 +131,7 @@
 
 TEST(AshmemTest, FileOperationsTest) {
     unique_fd fd;
-    void* region;
+    void* region = nullptr;
 
     // Allocate a 4-page buffer, but leave page-sized holes on either side
     constexpr size_t size = PAGE_SIZE * 4;
@@ -246,7 +246,7 @@
     unique_fd fd[nRegions];
     for (int i = 0; i < nRegions; i++) {
         ASSERT_NO_FATAL_FAILURE(TestCreateRegion(size, fd[i], PROT_READ | PROT_WRITE));
-        void *region;
+        void* region = nullptr;
         ASSERT_NO_FATAL_FAILURE(TestMmap(fd[i], size, PROT_READ | PROT_WRITE, &region));
         memcpy(region, &data, size);
         ASSERT_EQ(0, memcmp(region, &data, size));
diff --git a/libcutils/include/cutils/native_handle.h b/libcutils/include/cutils/native_handle.h
index 4f07456..e46e7cd 100644
--- a/libcutils/include/cutils/native_handle.h
+++ b/libcutils/include/cutils/native_handle.h
@@ -49,18 +49,28 @@
 typedef const native_handle_t* buffer_handle_t;
 
 /*
- * native_handle_close
- * 
- * closes the file descriptors contained in this native_handle_t
- * 
+ * Closes the file descriptors contained in this native_handle_t, which may
+ * either be untagged or tagged for ownership by this native_handle_t via
+ * native_handle_set_tag(). Mixing untagged and tagged fds in the same
+ * native_handle_t is not permitted and triggers an fdsan exception, but
+ * native_handle_set_fdsan_tag() can be used to bring consistency if this is
+ * intentional.
+ *
+ * If it's known that fds are tagged, prefer native_handle_close_with_tag() for
+ * better safety.
+ *
  * return 0 on success, or a negative error code on failure
- * 
  */
 int native_handle_close(const native_handle_t* h);
 
 /*
- * native_handle_init
- *
+ * Equivalent to native_handle_close(), but throws an fdsan exception if the fds
+ * are untagged. Use if it's known that the fds in this native_handle_t were
+ * previously tagged via native_handle_set_tag().
+ */
+int native_handle_close_with_tag(const native_handle_t* h);
+
+/*
  * Initializes a native_handle_t from storage.  storage must be declared with
  * NATIVE_HANDLE_DECLARE_STORAGE.  numFds and numInts must not respectively
  * exceed maxFds and maxInts used to declare the storage.
@@ -68,33 +78,42 @@
 native_handle_t* native_handle_init(char* storage, int numFds, int numInts);
 
 /*
- * native_handle_create
- *
- * creates a native_handle_t and initializes it. must be destroyed with
+ * Creates a native_handle_t and initializes it. Must be destroyed with
  * native_handle_delete(). Note that numFds must be <= NATIVE_HANDLE_MAX_FDS,
  * numInts must be <= NATIVE_HANDLE_MAX_INTS, and both must be >= 0.
- *
  */
 native_handle_t* native_handle_create(int numFds, int numInts);
 
 /*
- * native_handle_clone
- *
- * creates a native_handle_t and initializes it from another native_handle_t.
+ * Updates the fdsan tag for any file descriptors contained in the supplied
+ * handle to indicate that they are owned by this handle and should only be
+ * closed via native_handle_close()/native_handle_close_with_tag(). Each fd in
+ * the handle must have a tag of either 0 (unset) or the tag associated with
+ * this handle, otherwise an fdsan exception will be triggered.
+ */
+void native_handle_set_fdsan_tag(const native_handle_t* handle);
+
+/*
+ * Clears the fdsan tag for any file descriptors contained in the supplied
+ * native_handle_t. Use if this native_handle_t is giving up ownership of its
+ * fds, but the fdsan tags were previously set. Each fd in the handle must have
+ * a tag of either 0 (unset) or the tag associated with this handle, otherwise
+ * an fdsan exception will be triggered.
+ */
+void native_handle_unset_fdsan_tag(const native_handle_t* handle);
+
+/*
+ * Creates a native_handle_t and initializes it from another native_handle_t.
  * Must be destroyed with native_handle_delete().
- *
  */
 native_handle_t* native_handle_clone(const native_handle_t* handle);
 
 /*
- * native_handle_delete
- * 
- * frees a native_handle_t allocated with native_handle_create().
+ * Frees a native_handle_t allocated with native_handle_create().
  * This ONLY frees the memory allocated for the native_handle_t, but doesn't
  * close the file descriptors; which can be achieved with native_handle_close().
- * 
+ *
  * return 0 on success, or a negative error code on failure
- * 
  */
 int native_handle_delete(native_handle_t* h);
 
diff --git a/libcutils/include/cutils/qtaguid.h b/libcutils/include/cutils/qtaguid.h
index a5ffb03..8902c2b 100644
--- a/libcutils/include/cutils/qtaguid.h
+++ b/libcutils/include/cutils/qtaguid.h
@@ -33,12 +33,6 @@
  */
 extern int qtaguid_untagSocket(int sockfd);
 
-/*
- * Enable/disable qtaguid functionnality at a lower level.
- * When pacified, the kernel will accept commands but do nothing.
- */
-extern int qtaguid_setPacifier(int on);
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/libcutils/include/cutils/trace.h b/libcutils/include/cutils/trace.h
index 98ae0d4..3867f34 100644
--- a/libcutils/include/cutils/trace.h
+++ b/libcutils/include/cutils/trace.h
@@ -214,6 +214,7 @@
  * provided, which is the name of the row where this async event should be
  * recorded. The track name, name, and cookie used to begin an event must be
  * used to end it.
+ * The cookie here must be unique on the track_name level, not the name level.
  */
 #define ATRACE_ASYNC_FOR_TRACK_BEGIN(track_name, name, cookie) \
     atrace_async_for_track_begin(ATRACE_TAG, track_name, name, cookie)
@@ -229,13 +230,13 @@
  * Trace the end of an asynchronous event.
  * This should correspond to a previous ATRACE_ASYNC_FOR_TRACK_BEGIN.
  */
-#define ATRACE_ASYNC_FOR_TRACK_END(track_name, name, cookie) \
-    atrace_async_for_track_end(ATRACE_TAG, track_name, name, cookie)
+#define ATRACE_ASYNC_FOR_TRACK_END(track_name, cookie) \
+    atrace_async_for_track_end(ATRACE_TAG, track_name, cookie)
 static inline void atrace_async_for_track_end(uint64_t tag, const char* track_name,
-                                              const char* name, int32_t cookie) {
+                                              int32_t cookie) {
     if (CC_UNLIKELY(atrace_is_tag_enabled(tag))) {
-        void atrace_async_for_track_end_body(const char*, const char*, int32_t);
-        atrace_async_for_track_end_body(track_name, name, cookie);
+        void atrace_async_for_track_end_body(const char*, int32_t);
+        atrace_async_for_track_end_body(track_name, cookie);
     }
 }
 
diff --git a/libcutils/include/private/android_filesystem_config.h b/libcutils/include/private/android_filesystem_config.h
index 0030887..1e035bb 100644
--- a/libcutils/include/private/android_filesystem_config.h
+++ b/libcutils/include/private/android_filesystem_config.h
@@ -41,9 +41,11 @@
  */
 
 #define AID_ROOT 0 /* traditional unix root user */
-/* The following are for LTP and should only be used for testing */
-#define AID_DAEMON 1 /* traditional unix daemon owner */
-#define AID_BIN 2    /* traditional unix binaries owner */
+
+/* The following are for tests like LTP and should only be used for testing. */
+#define AID_DAEMON 1 /* Traditional unix daemon owner. */
+#define AID_BIN 2    /* Traditional unix binaries owner. */
+#define AID_SYS 3    /* A group with the same gid on Linux/macOS/Android. */
 
 #define AID_SYSTEM 1000 /* system server */
 
diff --git a/libcutils/native_handle.cpp b/libcutils/native_handle.cpp
index 5804ab1..b85c93b 100644
--- a/libcutils/native_handle.cpp
+++ b/libcutils/native_handle.cpp
@@ -22,13 +22,74 @@
 #include <string.h>
 #include <unistd.h>
 
+// Needs to come after stdlib includes to capture the __BIONIC__ definition
+#ifdef __BIONIC__
+#include <android/fdsan.h>
+#endif
+
+namespace {
+
+#if !defined(__BIONIC__)
+// fdsan stubs when not linked against bionic
+#define ANDROID_FDSAN_OWNER_TYPE_NATIVE_HANDLE 0
+
+uint64_t android_fdsan_create_owner_tag(int /*type*/, uint64_t /*tag*/) {
+    return 0;
+}
+uint64_t android_fdsan_get_owner_tag(int /*fd*/) {
+    return 0;
+}
+int android_fdsan_close_with_tag(int fd, uint64_t /*tag*/) {
+    return close(fd);
+}
+void android_fdsan_exchange_owner_tag(int /*fd*/, uint64_t /*expected_tag*/, uint64_t /*tag*/) {}
+#endif  // !__BIONIC__
+
+uint64_t get_fdsan_tag(const native_handle_t* handle) {
+    return android_fdsan_create_owner_tag(ANDROID_FDSAN_OWNER_TYPE_NATIVE_HANDLE,
+                                          reinterpret_cast<uint64_t>(handle));
+}
+
+int close_internal(const native_handle_t* h, bool allowUntagged) {
+    if (!h) return 0;
+
+    if (h->version != sizeof(native_handle_t)) return -EINVAL;
+
+    const int numFds = h->numFds;
+    uint64_t tag;
+    if (allowUntagged && numFds > 0 && android_fdsan_get_owner_tag(h->data[0]) == 0) {
+        tag = 0;
+    } else {
+        tag = get_fdsan_tag(h);
+    }
+    int saved_errno = errno;
+    for (int i = 0; i < numFds; ++i) {
+        android_fdsan_close_with_tag(h->data[i], tag);
+    }
+    errno = saved_errno;
+    return 0;
+}
+
+void swap_fdsan_tags(const native_handle_t* handle, uint64_t expected_tag, uint64_t new_tag) {
+    if (!handle || handle->version != sizeof(native_handle_t)) return;
+
+    for (int i = 0; i < handle->numFds; i++) {
+        // allow for idempotence to make the APIs easier to use
+        if (android_fdsan_get_owner_tag(handle->data[i]) != new_tag) {
+            android_fdsan_exchange_owner_tag(handle->data[i], expected_tag, new_tag);
+        }
+    }
+}
+
+}  // anonymous namespace
+
 native_handle_t* native_handle_init(char* storage, int numFds, int numInts) {
-    if ((uintptr_t) storage % alignof(native_handle_t)) {
+    if ((uintptr_t)storage % alignof(native_handle_t)) {
         errno = EINVAL;
         return NULL;
     }
 
-    native_handle_t* handle = (native_handle_t*) storage;
+    native_handle_t* handle = (native_handle_t*)storage;
     handle->version = sizeof(native_handle_t);
     handle->numFds = numFds;
     handle->numInts = numInts;
@@ -52,6 +113,14 @@
     return h;
 }
 
+void native_handle_set_fdsan_tag(const native_handle_t* handle) {
+    swap_fdsan_tags(handle, 0, get_fdsan_tag(handle));
+}
+
+void native_handle_unset_fdsan_tag(const native_handle_t* handle) {
+    swap_fdsan_tags(handle, get_fdsan_tag(handle), 0);
+}
+
 native_handle_t* native_handle_clone(const native_handle_t* handle) {
     native_handle_t* clone = native_handle_create(handle->numFds, handle->numInts);
     if (clone == NULL) return NULL;
@@ -81,15 +150,9 @@
 }
 
 int native_handle_close(const native_handle_t* h) {
-    if (!h) return 0;
+    return close_internal(h, /*allowUntagged=*/true);
+}
 
-    if (h->version != sizeof(native_handle_t)) return -EINVAL;
-
-    int saved_errno = errno;
-    const int numFds = h->numFds;
-    for (int i = 0; i < numFds; ++i) {
-        close(h->data[i]);
-    }
-    errno = saved_errno;
-    return 0;
+int native_handle_close_with_tag(const native_handle_t* h) {
+    return close_internal(h, /*allowUntagged=*/false);
 }
diff --git a/libcutils/trace-container.cpp b/libcutils/trace-container.cpp
index 6202662..eae6155 100644
--- a/libcutils/trace-container.cpp
+++ b/libcutils/trace-container.cpp
@@ -240,15 +240,15 @@
     WRITE_MSG("G|%d|", "|%" PRId32, track_name, name, cookie);
 }
 
-void atrace_async_for_track_end_body(const char* track_name, const char* name, int32_t cookie) {
+void atrace_async_for_track_end_body(const char* track_name, int32_t cookie) {
     if (CC_LIKELY(atrace_use_container_sock)) {
-        WRITE_MSG_IN_CONTAINER("H", "|", "|%d", track_name, name, cookie);
+        WRITE_MSG_IN_CONTAINER("H", "|", "|%d", "", track_name, cookie);
         return;
     }
 
     if (atrace_marker_fd < 0) return;
 
-    WRITE_MSG("H|%d|", "|%" PRId32, track_name, name, cookie);
+    WRITE_MSG("H|%d|", "|%" PRId32, "", track_name, cookie);
 }
 
 void atrace_instant_body(const char* name) {
diff --git a/libcutils/trace-dev.cpp b/libcutils/trace-dev.cpp
index e9583fb..1827e32 100644
--- a/libcutils/trace-dev.cpp
+++ b/libcutils/trace-dev.cpp
@@ -93,8 +93,8 @@
     WRITE_MSG("G|%d|", "|%" PRId32, track_name, name, cookie);
 }
 
-void atrace_async_for_track_end_body(const char* track_name, const char* name, int32_t cookie) {
-    WRITE_MSG("H|%d|", "|%" PRId32, track_name, name, cookie);
+void atrace_async_for_track_end_body(const char* track_name, int32_t cookie) {
+    WRITE_MSG("H|%d|", "|%" PRId32, "", track_name, cookie);
 }
 
 void atrace_instant_body(const char* name) {
diff --git a/libcutils/trace-dev_test.cpp b/libcutils/trace-dev_test.cpp
index d4a907d..3dea5ff 100644
--- a/libcutils/trace-dev_test.cpp
+++ b/libcutils/trace-dev_test.cpp
@@ -306,112 +306,52 @@
 }
 
 TEST_F(TraceDevTest, atrace_async_for_track_end_body_normal) {
-    atrace_async_for_track_end_body("fake_track", "fake_name", 12345);
+    atrace_async_for_track_end_body("fake_track", 12345);
 
     ASSERT_EQ(0, lseek(atrace_marker_fd, 0, SEEK_SET));
 
     std::string actual;
     ASSERT_TRUE(android::base::ReadFdToString(atrace_marker_fd, &actual));
-    std::string expected = android::base::StringPrintf("H|%d|fake_track|fake_name|12345", getpid());
+    std::string expected = android::base::StringPrintf("H|%d|fake_track|12345", getpid());
     ASSERT_STREQ(expected.c_str(), actual.c_str());
 }
 
-TEST_F(TraceDevTest, atrace_async_for_track_end_body_exact_track_name) {
-    const int name_size = 5;
+TEST_F(TraceDevTest, atrace_async_for_track_end_body_exact) {
     std::string expected = android::base::StringPrintf("H|%d|", getpid());
     std::string track_name =
-            MakeName(ATRACE_MESSAGE_LENGTH - expected.length() - 1 - name_size - 6);
-    atrace_async_for_track_end_body(track_name.c_str(), "name", 12345);
+            MakeName(ATRACE_MESSAGE_LENGTH - expected.length() - 7);
+    atrace_async_for_track_end_body(track_name.c_str(), 12345);
 
     ASSERT_EQ(ATRACE_MESSAGE_LENGTH - 1, lseek(atrace_marker_fd, 0, SEEK_CUR));
     ASSERT_EQ(0, lseek(atrace_marker_fd, 0, SEEK_SET));
 
     std::string actual;
     ASSERT_TRUE(android::base::ReadFdToString(atrace_marker_fd, &actual));
-    expected += track_name + "|name|12345";
+    expected += track_name + "|12345";
     ASSERT_STREQ(expected.c_str(), actual.c_str());
 
-    // Add a single character and verify name truncation
+    // Add a single character and verify we get the exact same value as before.
     ASSERT_EQ(0, lseek(atrace_marker_fd, 0, SEEK_SET));
     track_name += '*';
-    expected = android::base::StringPrintf("H|%d|", getpid());
-    expected += track_name + "|nam|12345";
-    atrace_async_for_track_end_body(track_name.c_str(), "name", 12345);
+    atrace_async_for_track_end_body(track_name.c_str(), 12345);
     EXPECT_EQ(ATRACE_MESSAGE_LENGTH - 1, lseek(atrace_marker_fd, 0, SEEK_CUR));
     ASSERT_EQ(0, lseek(atrace_marker_fd, 0, SEEK_SET));
     ASSERT_TRUE(android::base::ReadFdToString(atrace_marker_fd, &actual));
     ASSERT_STREQ(expected.c_str(), actual.c_str());
 }
 
-TEST_F(TraceDevTest, atrace_async_for_track_end_body_truncated_track_name) {
+TEST_F(TraceDevTest, atrace_async_for_track_end_body_truncated) {
     std::string expected = android::base::StringPrintf("H|%d|", getpid());
     std::string track_name = MakeName(2 * ATRACE_MESSAGE_LENGTH);
-    atrace_async_for_track_end_body(track_name.c_str(), "name", 12345);
+    atrace_async_for_track_end_body(track_name.c_str(), 12345);
 
     ASSERT_EQ(ATRACE_MESSAGE_LENGTH - 1, lseek(atrace_marker_fd, 0, SEEK_CUR));
     ASSERT_EQ(0, lseek(atrace_marker_fd, 0, SEEK_SET));
 
     std::string actual;
     ASSERT_TRUE(android::base::ReadFdToString(atrace_marker_fd, &actual));
-    int expected_len = ATRACE_MESSAGE_LENGTH - expected.length() - 9;
-    expected += android::base::StringPrintf("%.*s|n|12345", expected_len, track_name.c_str());
-    ASSERT_STREQ(expected.c_str(), actual.c_str());
-}
-
-TEST_F(TraceDevTest, atrace_async_for_track_end_body_exact_name) {
-    const int track_name_size = 11;
-    std::string expected = android::base::StringPrintf("H|%d|", getpid());
-    std::string name =
-            MakeName(ATRACE_MESSAGE_LENGTH - expected.length() - 1 - track_name_size - 6);
-    atrace_async_for_track_end_body("track_name", name.c_str(), 12345);
-
-    ASSERT_EQ(ATRACE_MESSAGE_LENGTH - 1, lseek(atrace_marker_fd, 0, SEEK_CUR));
-    ASSERT_EQ(0, lseek(atrace_marker_fd, 0, SEEK_SET));
-
-    std::string actual;
-    ASSERT_TRUE(android::base::ReadFdToString(atrace_marker_fd, &actual));
-    expected += "track_name|" + name + "|12345";
-    ASSERT_STREQ(expected.c_str(), actual.c_str());
-
-    // Add a single character and verify we get the same value as before.
-    ASSERT_EQ(0, lseek(atrace_marker_fd, 0, SEEK_SET));
-    name += '*';
-    atrace_async_for_track_end_body("track_name", name.c_str(), 12345);
-    EXPECT_EQ(ATRACE_MESSAGE_LENGTH - 1, lseek(atrace_marker_fd, 0, SEEK_CUR));
-    ASSERT_EQ(0, lseek(atrace_marker_fd, 0, SEEK_SET));
-    ASSERT_TRUE(android::base::ReadFdToString(atrace_marker_fd, &actual));
-    ASSERT_STREQ(expected.c_str(), actual.c_str());
-}
-
-TEST_F(TraceDevTest, atrace_async_for_track_end_body_truncated_name) {
-    std::string expected = android::base::StringPrintf("H|%d|track_name|", getpid());
-    std::string name = MakeName(2 * ATRACE_MESSAGE_LENGTH);
-    atrace_async_for_track_end_body("track_name", name.c_str(), 12345);
-
-    ASSERT_EQ(ATRACE_MESSAGE_LENGTH - 1, lseek(atrace_marker_fd, 0, SEEK_CUR));
-    ASSERT_EQ(0, lseek(atrace_marker_fd, 0, SEEK_SET));
-
-    std::string actual;
-    ASSERT_TRUE(android::base::ReadFdToString(atrace_marker_fd, &actual));
-    int expected_len = ATRACE_MESSAGE_LENGTH - expected.length() - 1 - 6;
-    expected += android::base::StringPrintf("%.*s|12345", expected_len, name.c_str());
-    ASSERT_STREQ(expected.c_str(), actual.c_str());
-}
-
-TEST_F(TraceDevTest, atrace_async_for_track_end_body_truncated_both) {
-    std::string expected = android::base::StringPrintf("H|%d|", getpid());
-    std::string name = MakeName(2 * ATRACE_MESSAGE_LENGTH);
-    std::string track_name = MakeName(2 * ATRACE_MESSAGE_LENGTH);
-    atrace_async_for_track_end_body(track_name.c_str(), name.c_str(), 12345);
-
-    ASSERT_EQ(ATRACE_MESSAGE_LENGTH - 1, lseek(atrace_marker_fd, 0, SEEK_CUR));
-    ASSERT_EQ(0, lseek(atrace_marker_fd, 0, SEEK_SET));
-
-    std::string actual;
-    ASSERT_TRUE(android::base::ReadFdToString(atrace_marker_fd, &actual));
-    int expected_len = ATRACE_MESSAGE_LENGTH - expected.length() - 3 - 6;
-    expected += android::base::StringPrintf("%.*s|%.1s|12345", expected_len, track_name.c_str(),
-                                            name.c_str());
+    int expected_len = ATRACE_MESSAGE_LENGTH - expected.length() - 7;
+    expected += android::base::StringPrintf("%.*s|12345", expected_len, track_name.c_str());
     ASSERT_STREQ(expected.c_str(), actual.c_str());
 }
 
diff --git a/libcutils/trace-host.cpp b/libcutils/trace-host.cpp
index c2a379b..e9f58c3 100644
--- a/libcutils/trace-host.cpp
+++ b/libcutils/trace-host.cpp
@@ -30,8 +30,7 @@
 void atrace_async_end_body(const char* /*name*/, int32_t /*cookie*/) {}
 void atrace_async_for_track_begin_body(const char* /*track_name*/, const char* /*name*/,
                                        int32_t /*cookie*/) {}
-void atrace_async_for_track_end_body(const char* /*track_name*/, const char* /*name*/,
-                                     int32_t /*cookie*/) {}
+void atrace_async_for_track_end_body(const char* /*track_name*/, int32_t /*cookie*/) {}
 void atrace_instant_body(const char* /*name*/) {}
 void atrace_instant_for_track_body(const char* /*track_name*/, const char* /*name*/) {}
 void atrace_int_body(const char* /*name*/, int32_t /*value*/) {}
diff --git a/libmodprobe/libmodprobe.cpp b/libmodprobe/libmodprobe.cpp
index 3054d2b..e071c96 100644
--- a/libmodprobe/libmodprobe.cpp
+++ b/libmodprobe/libmodprobe.cpp
@@ -440,12 +440,12 @@
 }
 
 // Another option to load kernel modules. load in independent modules in parallel
-// and then load modules which only have soft dependency, third update dependency list of other
-// remaining modules, repeat these steps until all modules are loaded.
+// and then update dependency list of other remaining modules, repeat these steps
+// until all modules are loaded.
 bool Modprobe::LoadModulesParallel(int num_threads) {
     bool ret = true;
+    int count = -1;
     std::map<std::string, std::set<std::string>> mod_with_deps;
-    std::map<std::string, std::set<std::string>> mod_with_softdeps;
 
     // Get dependencies
     for (const auto& module : module_load_) {
@@ -458,26 +458,36 @@
 
     // Get soft dependencies
     for (const auto& [it_mod, it_softdep] : module_pre_softdep_) {
-        mod_with_softdeps[MakeCanonical(it_mod)].emplace(it_softdep);
+        if (mod_with_deps.find(MakeCanonical(it_softdep)) != mod_with_deps.end()) {
+            mod_with_deps[MakeCanonical(it_mod)].emplace(
+                GetDependencies(MakeCanonical(it_softdep))[0]);
+        }
     }
 
     // Get soft post dependencies
     for (const auto& [it_mod, it_softdep] : module_post_softdep_) {
-        mod_with_softdeps[MakeCanonical(it_mod)].emplace(it_softdep);
+        if (mod_with_deps.find(MakeCanonical(it_softdep)) != mod_with_deps.end()) {
+            mod_with_deps[MakeCanonical(it_softdep)].emplace(
+                GetDependencies(MakeCanonical(it_mod))[0]);
+        }
     }
 
-    while (!mod_with_deps.empty()) {
+    while (!mod_with_deps.empty() &&  count != module_loaded_.size()) {
         std::vector<std::thread> threads;
         std::vector<std::string> mods_path_to_load;
-        std::vector<std::string> mods_with_softdep_to_load;
         std::mutex vector_lock;
+        count = module_loaded_.size();
 
-        // Find independent modules and modules only having soft dependencies
+        // Find independent modules
         for (const auto& [it_mod, it_dep] : mod_with_deps) {
-            if (it_dep.size() == 1 && mod_with_softdeps[it_mod].empty()) {
-                mods_path_to_load.emplace_back(*(it_dep.begin()));
-            } else if (it_dep.size() == 1) {
-                mods_with_softdep_to_load.emplace_back(it_mod);
+            if (it_dep.size() == 1) {
+                if (module_options_[it_mod].find("load_sequential=1") != std::string::npos) {
+                    if (!LoadWithAliases(it_mod, true) && !IsBlocklisted(it_mod)) {
+                      return false;
+                    }
+                } else {
+                    mods_path_to_load.emplace_back(it_mod);
+                }
             }
         }
 
@@ -485,12 +495,16 @@
         auto thread_function = [&] {
             std::unique_lock lk(vector_lock);
             while (!mods_path_to_load.empty()) {
-                auto mod_path_to_load = std::move(mods_path_to_load.back());
+                auto ret_load = true;
+                auto mod_to_load = std::move(mods_path_to_load.back());
                 mods_path_to_load.pop_back();
 
                 lk.unlock();
-                ret &= Insmod(mod_path_to_load, "");
+                ret_load &= LoadWithAliases(mod_to_load, true);
                 lk.lock();
+                if (!ret_load && !IsBlocklisted(mod_to_load)) {
+                    ret &= ret_load;
+                }
             }
         };
 
@@ -502,21 +516,12 @@
             thread.join();
         }
 
-        // Since we cannot assure if these soft dependencies tree are overlap,
-        // we loaded these modules one by one.
-        for (auto dep = mods_with_softdep_to_load.rbegin(); dep != mods_with_softdep_to_load.rend();
-             dep++) {
-            ret &= LoadWithAliases(*dep, true);
-        }
+        if (!ret) return ret;
 
         std::lock_guard guard(module_loaded_lock_);
         // Remove loaded module form mod_with_deps and soft dependencies of other modules
         for (const auto& module_loaded : module_loaded_) {
             mod_with_deps.erase(module_loaded);
-
-            for (auto& [mod, softdeps] : mod_with_softdeps) {
-                softdeps.erase(module_loaded);
-            }
         }
 
         // Remove loaded module form dependencies of other modules which are not loaded yet
diff --git a/libnetutils/dhcpclient.c b/libnetutils/dhcpclient.c
index 11c116a..ad6898c 100644
--- a/libnetutils/dhcpclient.c
+++ b/libnetutils/dhcpclient.c
@@ -45,7 +45,7 @@
 
 typedef unsigned long long msecs_t;
 #if VERBOSE
-void dump_dhcp_msg();
+void dump_dhcp_msg(dhcp_msg *msg, int len);
 #endif
 
 msecs_t get_msecs(void)
diff --git a/libpackagelistparser/TEST_MAPPING b/libpackagelistparser/TEST_MAPPING
index d69a7fb..f4a7761 100644
--- a/libpackagelistparser/TEST_MAPPING
+++ b/libpackagelistparser/TEST_MAPPING
@@ -4,7 +4,7 @@
       "name": "libpackagelistparser_test"
     }
   ],
-  "hwasan-postsubmit": [
+  "hwasan-presubmit": [
     {
       "name": "libpackagelistparser_test"
     }
diff --git a/libprocessgroup/Android.bp b/libprocessgroup/Android.bp
index 7b0e0d3..c6a0737 100644
--- a/libprocessgroup/Android.bp
+++ b/libprocessgroup/Android.bp
@@ -2,6 +2,17 @@
     default_applicable_licenses: ["Android-Apache-2.0"],
 }
 
+cc_defaults {
+    name: "libprocessgroup_defaults",
+    cpp_std: "gnu++20",
+    cflags: [
+        "-Wall",
+        "-Werror",
+        "-Wexit-time-destructors",
+        "-Wno-unused-parameter",
+    ],
+}
+
 cc_library_headers {
     name: "libprocessgroup_headers",
     vendor_available: true,
@@ -62,11 +73,7 @@
     export_header_lib_headers: [
         "libprocessgroup_headers",
     ],
-    cflags: [
-        "-Wall",
-        "-Werror",
-        "-Wexit-time-destructors",
-    ],
+    defaults: ["libprocessgroup_defaults"],
     apex_available: [
         "//apex_available:platform",
         "//apex_available:anyapex",
@@ -77,12 +84,7 @@
 cc_test {
     name: "task_profiles_test",
     host_supported: true,
-    cflags: [
-        "-Wall",
-        "-Werror",
-        "-Wexit-time-destructors",
-        "-Wno-unused-parameter",
-    ],
+    defaults: ["libprocessgroup_defaults"],
     srcs: [
         "task_profiles_test.cpp",
     ],
diff --git a/libprocessgroup/OWNERS b/libprocessgroup/OWNERS
index 8ebb8cc..d5aa721 100644
--- a/libprocessgroup/OWNERS
+++ b/libprocessgroup/OWNERS
@@ -1,2 +1,4 @@
-ccross@google.com
+# Bug component: 1293033
 surenb@google.com
+tjmercier@google.com
+carlosgalo@google.com
diff --git a/libprocessgroup/cgrouprc/libcgrouprc.map.txt b/libprocessgroup/cgrouprc/libcgrouprc.map.txt
index ce5c419..b62b10f 100644
--- a/libprocessgroup/cgrouprc/libcgrouprc.map.txt
+++ b/libprocessgroup/cgrouprc/libcgrouprc.map.txt
@@ -1,18 +1,18 @@
 LIBCGROUPRC { # introduced=29
   global:
-    ACgroupFile_getVersion;
-    ACgroupFile_getControllerCount;
-    ACgroupFile_getController;
-    ACgroupController_getVersion;
-    ACgroupController_getName;
-    ACgroupController_getPath;
+    ACgroupFile_getVersion; # llndk systemapi
+    ACgroupFile_getControllerCount; # llndk systemapi
+    ACgroupFile_getController; # llndk systemapi
+    ACgroupController_getVersion; # llndk systemapi
+    ACgroupController_getName; # llndk systemapi
+    ACgroupController_getPath; # llndk systemapi
   local:
     *;
 };
 
 LIBCGROUPRC_30 { # introduced=30
   global:
-    ACgroupController_getFlags;
+    ACgroupController_getFlags; # llndk systemapi
   local:
     *;
 };
diff --git a/libprocessgroup/include/processgroup/processgroup.h b/libprocessgroup/include/processgroup/processgroup.h
index 39b9f3f..9b2d775 100644
--- a/libprocessgroup/include/processgroup/processgroup.h
+++ b/libprocessgroup/include/processgroup/processgroup.h
@@ -18,13 +18,17 @@
 
 #include <sys/cdefs.h>
 #include <sys/types.h>
+#include <initializer_list>
+#include <span>
 #include <string>
+#include <string_view>
 #include <vector>
 
 __BEGIN_DECLS
 
 static constexpr const char* CGROUPV2_CONTROLLER_NAME = "cgroup2";
 
+bool CgroupsAvailable();
 bool CgroupGetControllerPath(const std::string& cgroup_name, std::string* path);
 bool CgroupGetControllerFromPath(const std::string& path, std::string* cgroup_name);
 bool CgroupGetAttributePath(const std::string& attr_name, std::string* path);
@@ -33,6 +37,19 @@
 bool SetTaskProfiles(int tid, const std::vector<std::string>& profiles, bool use_fd_cache = false);
 bool SetProcessProfiles(uid_t uid, pid_t pid, const std::vector<std::string>& profiles);
 
+__END_DECLS
+
+bool SetTaskProfiles(int tid, std::initializer_list<std::string_view> profiles,
+                     bool use_fd_cache = false);
+bool SetProcessProfiles(uid_t uid, pid_t pid, std::initializer_list<std::string_view> profiles);
+#if _LIBCPP_STD_VER > 17
+bool SetTaskProfiles(int tid, std::span<const std::string_view> profiles,
+                     bool use_fd_cache = false);
+bool SetProcessProfiles(uid_t uid, pid_t pid, std::span<const std::string_view> profiles);
+#endif
+
+__BEGIN_DECLS
+
 #ifndef __ANDROID_VNDK__
 
 bool SetProcessProfilesCached(uid_t uid, pid_t pid, const std::vector<std::string>& profiles);
diff --git a/libprocessgroup/processgroup.cpp b/libprocessgroup/processgroup.cpp
index 267e62c..1da69ba 100644
--- a/libprocessgroup/processgroup.cpp
+++ b/libprocessgroup/processgroup.cpp
@@ -55,6 +55,11 @@
 
 #define PROCESSGROUP_CGROUP_PROCS_FILE "/cgroup.procs"
 
+bool CgroupsAvailable() {
+    static bool cgroups_available = access("/proc/cgroups", F_OK) == 0;
+    return cgroups_available;
+}
+
 bool CgroupGetControllerPath(const std::string& cgroup_name, std::string* path) {
     auto controller = CgroupMap::GetInstance().FindController(cgroup_name);
 
@@ -148,14 +153,35 @@
 }
 
 bool SetProcessProfiles(uid_t uid, pid_t pid, const std::vector<std::string>& profiles) {
+    return TaskProfiles::GetInstance().SetProcessProfiles(
+            uid, pid, std::span<const std::string>(profiles), false);
+}
+
+bool SetProcessProfiles(uid_t uid, pid_t pid, std::initializer_list<std::string_view> profiles) {
+    return TaskProfiles::GetInstance().SetProcessProfiles(
+            uid, pid, std::span<const std::string_view>(profiles), false);
+}
+
+bool SetProcessProfiles(uid_t uid, pid_t pid, std::span<const std::string_view> profiles) {
     return TaskProfiles::GetInstance().SetProcessProfiles(uid, pid, profiles, false);
 }
 
 bool SetProcessProfilesCached(uid_t uid, pid_t pid, const std::vector<std::string>& profiles) {
-    return TaskProfiles::GetInstance().SetProcessProfiles(uid, pid, profiles, true);
+    return TaskProfiles::GetInstance().SetProcessProfiles(
+            uid, pid, std::span<const std::string>(profiles), true);
 }
 
 bool SetTaskProfiles(int tid, const std::vector<std::string>& profiles, bool use_fd_cache) {
+    return TaskProfiles::GetInstance().SetTaskProfiles(tid, std::span<const std::string>(profiles),
+                                                       use_fd_cache);
+}
+
+bool SetTaskProfiles(int tid, std::initializer_list<std::string_view> profiles, bool use_fd_cache) {
+    return TaskProfiles::GetInstance().SetTaskProfiles(
+            tid, std::span<const std::string_view>(profiles), use_fd_cache);
+}
+
+bool SetTaskProfiles(int tid, std::span<const std::string_view> profiles, bool use_fd_cache) {
     return TaskProfiles::GetInstance().SetTaskProfiles(tid, profiles, use_fd_cache);
 }
 
@@ -166,12 +192,12 @@
 // https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3574427/5/src/linux/android.rs#12
 extern "C" bool android_set_process_profiles(uid_t uid, pid_t pid, size_t num_profiles,
                                              const char* profiles[]) {
-    std::vector<std::string> profiles_;
+    std::vector<std::string_view> profiles_;
     profiles_.reserve(num_profiles);
     for (size_t i = 0; i < num_profiles; i++) {
         profiles_.emplace_back(profiles[i]);
     }
-    return SetProcessProfiles(uid, pid, profiles_);
+    return SetProcessProfiles(uid, pid, std::span<const std::string_view>(profiles_));
 }
 
 static std::string ConvertUidToPath(const char* cgroup, uid_t uid) {
@@ -187,10 +213,6 @@
     auto uid_pid_path = ConvertUidPidToPath(cgroup, uid, pid);
     auto uid_path = ConvertUidToPath(cgroup, uid);
 
-    if (retries == 0) {
-        retries = 1;
-    }
-
     while (retries--) {
         ret = rmdir(uid_pid_path.c_str());
         if (!ret || errno != EBUSY) break;
@@ -345,59 +367,70 @@
 // Returns 0 if there are no processes in the process cgroup left to kill
 // Returns -1 on error
 static int DoKillProcessGroupOnce(const char* cgroup, uid_t uid, int initialPid, int signal) {
-    auto path = ConvertUidPidToPath(cgroup, uid, initialPid) + PROCESSGROUP_CGROUP_PROCS_FILE;
-    std::unique_ptr<FILE, decltype(&fclose)> fd(fopen(path.c_str(), "re"), fclose);
-    if (!fd) {
-        if (errno == ENOENT) {
-            // This happens when process is already dead
-            return 0;
-        }
-        PLOG(WARNING) << __func__ << " failed to open process cgroup uid " << uid << " pid "
-                      << initialPid;
-        return -1;
-    }
-
     // We separate all of the pids in the cgroup into those pids that are also the leaders of
     // process groups (stored in the pgids set) and those that are not (stored in the pids set).
     std::set<pid_t> pgids;
     pgids.emplace(initialPid);
     std::set<pid_t> pids;
 
-    pid_t pid;
+    std::unique_ptr<FILE, decltype(&fclose)> fd(nullptr, fclose);
+
+    if (CgroupsAvailable()) {
+        auto path = ConvertUidPidToPath(cgroup, uid, initialPid) + PROCESSGROUP_CGROUP_PROCS_FILE;
+        fd.reset(fopen(path.c_str(), "re"));
+        if (!fd) {
+            if (errno == ENOENT) {
+                // This happens when process is already dead
+                return 0;
+            }
+            PLOG(WARNING) << __func__ << " failed to open process cgroup uid " << uid << " pid "
+                          << initialPid;
+            return -1;
+        }
+        pid_t pid;
+        bool file_is_empty = true;
+        while (fscanf(fd.get(), "%d\n", &pid) == 1 && pid >= 0) {
+            file_is_empty = false;
+            if (pid == 0) {
+                // Should never happen...  but if it does, trying to kill this
+                // will boomerang right back and kill us!  Let's not let that happen.
+                LOG(WARNING)
+                        << "Yikes, we've been told to kill pid 0!  How about we don't do that?";
+                continue;
+            }
+            pid_t pgid = getpgid(pid);
+            if (pgid == -1) PLOG(ERROR) << "getpgid(" << pid << ") failed";
+            if (pgid == pid) {
+                pgids.emplace(pid);
+            } else {
+                pids.emplace(pid);
+            }
+        }
+        if (file_is_empty) {
+            // This happens when process is already dead
+            return 0;
+        }
+
+        // Erase all pids that will be killed when we kill the process groups.
+        for (auto it = pids.begin(); it != pids.end();) {
+            pid_t pgid = getpgid(*it);
+            if (pgids.count(pgid) == 1) {
+                it = pids.erase(it);
+            } else {
+                ++it;
+            }
+        }
+    }
+
     int processes = 0;
-    while (fscanf(fd.get(), "%d\n", &pid) == 1 && pid >= 0) {
-        processes++;
-        if (pid == 0) {
-            // Should never happen...  but if it does, trying to kill this
-            // will boomerang right back and kill us!  Let's not let that happen.
-            LOG(WARNING) << "Yikes, we've been told to kill pid 0!  How about we don't do that?";
-            continue;
-        }
-        pid_t pgid = getpgid(pid);
-        if (pgid == -1) PLOG(ERROR) << "getpgid(" << pid << ") failed";
-        if (pgid == pid) {
-            pgids.emplace(pid);
-        } else {
-            pids.emplace(pid);
-        }
-    }
-
-    // Erase all pids that will be killed when we kill the process groups.
-    for (auto it = pids.begin(); it != pids.end();) {
-        pid_t pgid = getpgid(*it);
-        if (pgids.count(pgid) == 1) {
-            it = pids.erase(it);
-        } else {
-            ++it;
-        }
-    }
-
     // Kill all process groups.
     for (const auto pgid : pgids) {
         LOG(VERBOSE) << "Killing process group " << -pgid << " in uid " << uid
                      << " as part of process cgroup " << initialPid;
 
-        if (kill(-pgid, signal) == -1 && errno != ESRCH) {
+        if (kill(-pgid, signal) == 0) {
+            processes++;
+        } else if (errno != ESRCH) {
             PLOG(WARNING) << "kill(" << -pgid << ", " << signal << ") failed";
         }
     }
@@ -407,18 +440,22 @@
         LOG(VERBOSE) << "Killing pid " << pid << " in uid " << uid << " as part of process cgroup "
                      << initialPid;
 
-        if (kill(pid, signal) == -1 && errno != ESRCH) {
+        if (kill(pid, signal) == 0) {
+            processes++;
+        } else if (errno != ESRCH) {
             PLOG(WARNING) << "kill(" << pid << ", " << signal << ") failed";
         }
     }
 
-    return feof(fd.get()) ? processes : -1;
+    return (!fd || feof(fd.get())) ? processes : -1;
 }
 
 static int KillProcessGroup(uid_t uid, int initialPid, int signal, int retries,
                             int* max_processes) {
     std::string hierarchy_root_path;
-    CgroupGetControllerPath(CGROUPV2_CONTROLLER_NAME, &hierarchy_root_path);
+    if (CgroupsAvailable()) {
+        CgroupGetControllerPath(CGROUPV2_CONTROLLER_NAME, &hierarchy_root_path);
+    }
     const char* cgroup = hierarchy_root_path.c_str();
 
     std::chrono::steady_clock::time_point start = std::chrono::steady_clock::now();
@@ -434,6 +471,11 @@
             *max_processes = processes;
         }
         LOG(VERBOSE) << "Killed " << processes << " processes for processgroup " << initialPid;
+        if (!CgroupsAvailable()) {
+            // makes no sense to retry, because there are no cgroup_procs file
+            processes = 0;  // no remaining processes
+            break;
+        }
         if (retry > 0) {
             std::this_thread::sleep_for(5ms);
             --retry;
@@ -463,12 +505,18 @@
                       << " in " << static_cast<int>(ms) << "ms";
         }
 
-        int err = RemoveProcessGroup(cgroup, uid, initialPid, retries);
+        if (!CgroupsAvailable()) {
+            // nothing to do here, if cgroups isn't available
+            return 0;
+        }
+
+        // 400 retries correspond to 2 secs max timeout
+        int err = RemoveProcessGroup(cgroup, uid, initialPid, 400);
 
         if (isMemoryCgroupSupported() && UsePerAppMemcg()) {
             std::string memcg_apps_path;
             if (CgroupGetMemcgAppsPath(&memcg_apps_path) &&
-                RemoveProcessGroup(memcg_apps_path.c_str(), uid, initialPid, retries) < 0) {
+                RemoveProcessGroup(memcg_apps_path.c_str(), uid, initialPid, 400) < 0) {
                 return -1;
             }
         }
diff --git a/libprocessgroup/profiles/task_profiles.json b/libprocessgroup/profiles/task_profiles.json
index 4092c1a..e44d3bf 100644
--- a/libprocessgroup/profiles/task_profiles.json
+++ b/libprocessgroup/profiles/task_profiles.json
@@ -76,6 +76,24 @@
       "Name": "FreezerState",
       "Controller": "freezer",
       "File": "cgroup.freeze"
+    },
+    {
+      "Name": "BfqWeight",
+      "Controller": "io",
+      "File": "blkio.bfq.weight",
+      "FileV2": "io.bfq.weight"
+    },
+    {
+      "Name": "CfqGroupIdle",
+      "Controller": "io",
+      "File": "blkio.group_idle",
+      "FileV2": "io.group_idle"
+    },
+    {
+      "Name": "CfqWeight",
+      "Controller": "io",
+      "File": "blkio.weight",
+      "FileV2": "io.weight"
     }
   ],
 
@@ -445,6 +463,33 @@
             "Controller": "blkio",
             "Path": "background"
           }
+        },
+        {
+          "Name": "SetAttribute",
+          "Params":
+          {
+            "Name": "BfqWeight",
+            "Value": "10",
+            "Optional": "true"
+          }
+        },
+        {
+          "Name": "SetAttribute",
+          "Params":
+          {
+            "Name": "CfqGroupIdle",
+            "Value": "0",
+            "Optional": "true"
+          }
+        },
+        {
+          "Name": "SetAttribute",
+          "Params":
+          {
+            "Name": "CfqWeight",
+            "Value": "200",
+            "Optional": "true"
+          }
         }
       ]
     },
@@ -458,6 +503,33 @@
             "Controller": "blkio",
             "Path": ""
           }
+        },
+        {
+          "Name": "SetAttribute",
+          "Params":
+          {
+            "Name": "BfqWeight",
+            "Value": "100",
+            "Optional": "true"
+          }
+        },
+        {
+          "Name": "SetAttribute",
+          "Params":
+          {
+            "Name": "CfqGroupIdle",
+            "Value": "0",
+            "Optional": "true"
+          }
+        },
+        {
+          "Name": "SetAttribute",
+          "Params":
+          {
+            "Name": "CfqWeight",
+            "Value": "1000",
+            "Optional": "true"
+          }
         }
       ]
     },
@@ -471,6 +543,33 @@
             "Controller": "blkio",
             "Path": ""
           }
+        },
+        {
+          "Name": "SetAttribute",
+          "Params":
+          {
+            "Name": "BfqWeight",
+            "Value": "100",
+            "Optional": "true"
+          }
+        },
+        {
+          "Name": "SetAttribute",
+          "Params":
+          {
+            "Name": "CfqGroupIdle",
+            "Value": "0",
+            "Optional": "true"
+          }
+        },
+        {
+          "Name": "SetAttribute",
+          "Params":
+          {
+            "Name": "CfqWeight",
+            "Value": "1000",
+            "Optional": "true"
+          }
         }
       ]
     },
@@ -484,6 +583,33 @@
             "Controller": "blkio",
             "Path": ""
           }
+        },
+        {
+          "Name": "SetAttribute",
+          "Params":
+          {
+            "Name": "BfqWeight",
+            "Value": "100",
+            "Optional": "true"
+          }
+        },
+        {
+          "Name": "SetAttribute",
+          "Params":
+          {
+            "Name": "CfqGroupIdle",
+            "Value": "0",
+            "Optional": "true"
+          }
+        },
+        {
+          "Name": "SetAttribute",
+          "Params":
+          {
+            "Name": "CfqWeight",
+            "Value": "1000",
+            "Optional": "true"
+          }
         }
       ]
     },
@@ -647,7 +773,7 @@
       "Profiles": [ "ServicePerformance", "LowIoPriority", "TimerSlackNormal" ]
     },
     {
-      "Name": "VMCompilationPerformance",
+      "Name": "SCHED_SP_COMPUTE",
       "Profiles": [ "HighPerformance", "ProcessCapacityHigh", "LowIoPriority", "TimerSlackNormal" ]
     },
     {
@@ -683,6 +809,10 @@
       "Profiles": [ "Dex2oatPerformance", "LowIoPriority", "TimerSlackHigh" ]
     },
     {
+      "Name": "Dex2OatBackground",
+      "Profiles": [ "Dex2OatBootComplete" ]
+    },
+    {
       "Name": "OtaProfiles",
       "Profiles": [ "ServiceCapacityLow", "LowIoPriority", "HighEnergySaving" ]
     }
diff --git a/libprocessgroup/setup/cgroup_map_write.cpp b/libprocessgroup/setup/cgroup_map_write.cpp
index 3831ef2..304248a 100644
--- a/libprocessgroup/setup/cgroup_map_write.cpp
+++ b/libprocessgroup/setup/cgroup_map_write.cpp
@@ -410,7 +410,7 @@
     // Make sure we do this only one time. No need for std::call_once because
     // init is a single-threaded process
     if (access(CGROUPS_RC_PATH, F_OK) == 0) {
-        LOG(WARNING) << "Attempt to call SetupCgroups more than once";
+        LOG(WARNING) << "Attempt to call CgroupSetup() more than once";
         return true;
     }
 
diff --git a/libprocessgroup/task_profiles.cpp b/libprocessgroup/task_profiles.cpp
index e1c5934..35adf36 100644
--- a/libprocessgroup/task_profiles.cpp
+++ b/libprocessgroup/task_profiles.cpp
@@ -287,7 +287,7 @@
     if (cache_type == ResourceCacheType::RCT_TASK &&
         fd_[cache_type] == FdCacheHelper::FDS_APP_DEPENDENT) {
         // application-dependent path can't be used with tid
-        PLOG(ERROR) << "Application profile can't be applied to a thread";
+        LOG(ERROR) << Name() << ": application profile can't be applied to a thread";
         return ProfileAction::FAIL;
     }
 
@@ -304,7 +304,7 @@
     std::string procs_path = controller()->GetProcsFilePath(path_, uid, pid);
     unique_fd tmp_fd(TEMP_FAILURE_RETRY(open(procs_path.c_str(), O_WRONLY | O_CLOEXEC)));
     if (tmp_fd < 0) {
-        PLOG(WARNING) << "Failed to open " << procs_path;
+        PLOG(WARNING) << Name() << "::" << __func__ << ": failed to open " << procs_path;
         return false;
     }
     if (!AddTidToCgroup(pid, tmp_fd, controller()->name())) {
@@ -325,7 +325,7 @@
     std::string tasks_path = controller()->GetTasksFilePath(path_);
     unique_fd tmp_fd(TEMP_FAILURE_RETRY(open(tasks_path.c_str(), O_WRONLY | O_CLOEXEC)));
     if (tmp_fd < 0) {
-        PLOG(WARNING) << "Failed to open " << tasks_path;
+        PLOG(WARNING) << Name() << "::" << __func__ << ": failed to open " << tasks_path;
         return false;
     }
     if (!AddTidToCgroup(tid, tmp_fd, controller()->name())) {
@@ -394,7 +394,7 @@
     unique_fd tmp_fd(TEMP_FAILURE_RETRY(open(path.c_str(), O_WRONLY | O_CLOEXEC)));
 
     if (tmp_fd < 0) {
-        if (logfailures) PLOG(WARNING) << "Failed to open " << path;
+        if (logfailures) PLOG(WARNING) << Name() << "::" << __func__ << ": failed to open " << path;
         return false;
     }
 
@@ -431,7 +431,7 @@
     if (cache_type == ResourceCacheType::RCT_TASK &&
         fd_[cache_type] == FdCacheHelper::FDS_APP_DEPENDENT) {
         // application-dependent path can't be used with tid
-        PLOG(ERROR) << "Application profile can't be applied to a thread";
+        LOG(ERROR) << Name() << ": application profile can't be applied to a thread";
         return ProfileAction::FAIL;
     }
     return ProfileAction::UNUSED;
@@ -786,7 +786,7 @@
     return true;
 }
 
-TaskProfile* TaskProfiles::GetProfile(const std::string& name) const {
+TaskProfile* TaskProfiles::GetProfile(std::string_view name) const {
     auto iter = profiles_.find(name);
 
     if (iter != profiles_.end()) {
@@ -795,7 +795,7 @@
     return nullptr;
 }
 
-const IProfileAttribute* TaskProfiles::GetAttribute(const std::string& name) const {
+const IProfileAttribute* TaskProfiles::GetAttribute(std::string_view name) const {
     auto iter = attributes_.find(name);
 
     if (iter != attributes_.end()) {
@@ -804,8 +804,9 @@
     return nullptr;
 }
 
-bool TaskProfiles::SetProcessProfiles(uid_t uid, pid_t pid,
-                                      const std::vector<std::string>& profiles, bool use_fd_cache) {
+template <typename T>
+bool TaskProfiles::SetProcessProfiles(uid_t uid, pid_t pid, std::span<const T> profiles,
+                                      bool use_fd_cache) {
     bool success = true;
     for (const auto& name : profiles) {
         TaskProfile* profile = GetProfile(name);
@@ -825,8 +826,8 @@
     return success;
 }
 
-bool TaskProfiles::SetTaskProfiles(int tid, const std::vector<std::string>& profiles,
-                                   bool use_fd_cache) {
+template <typename T>
+bool TaskProfiles::SetTaskProfiles(int tid, std::span<const T> profiles, bool use_fd_cache) {
     bool success = true;
     for (const auto& name : profiles) {
         TaskProfile* profile = GetProfile(name);
@@ -845,3 +846,14 @@
     }
     return success;
 }
+
+template bool TaskProfiles::SetProcessProfiles(uid_t uid, pid_t pid,
+                                               std::span<const std::string> profiles,
+                                               bool use_fd_cache);
+template bool TaskProfiles::SetProcessProfiles(uid_t uid, pid_t pid,
+                                               std::span<const std::string_view> profiles,
+                                               bool use_fd_cache);
+template bool TaskProfiles::SetTaskProfiles(int tid, std::span<const std::string> profiles,
+                                            bool use_fd_cache);
+template bool TaskProfiles::SetTaskProfiles(int tid, std::span<const std::string_view> profiles,
+                                            bool use_fd_cache);
diff --git a/libprocessgroup/task_profiles.h b/libprocessgroup/task_profiles.h
index df08f65..85b3f91 100644
--- a/libprocessgroup/task_profiles.h
+++ b/libprocessgroup/task_profiles.h
@@ -18,9 +18,12 @@
 
 #include <sys/cdefs.h>
 #include <sys/types.h>
+#include <functional>
 #include <map>
 #include <mutex>
+#include <span>
 #include <string>
+#include <string_view>
 #include <vector>
 
 #include <android-base/unique_fd.h>
@@ -206,18 +209,19 @@
     // Should be used by all users
     static TaskProfiles& GetInstance();
 
-    TaskProfile* GetProfile(const std::string& name) const;
-    const IProfileAttribute* GetAttribute(const std::string& name) const;
+    TaskProfile* GetProfile(std::string_view name) const;
+    const IProfileAttribute* GetAttribute(std::string_view name) const;
     void DropResourceCaching(ProfileAction::ResourceCacheType cache_type) const;
-    bool SetProcessProfiles(uid_t uid, pid_t pid, const std::vector<std::string>& profiles,
-                            bool use_fd_cache);
-    bool SetTaskProfiles(int tid, const std::vector<std::string>& profiles, bool use_fd_cache);
+    template <typename T>
+    bool SetProcessProfiles(uid_t uid, pid_t pid, std::span<const T> profiles, bool use_fd_cache);
+    template <typename T>
+    bool SetTaskProfiles(int tid, std::span<const T> profiles, bool use_fd_cache);
 
   private:
-    std::map<std::string, std::shared_ptr<TaskProfile>> profiles_;
-    std::map<std::string, std::unique_ptr<IProfileAttribute>> attributes_;
-
     TaskProfiles();
 
     bool Load(const CgroupMap& cg_map, const std::string& file_name);
+
+    std::map<std::string, std::shared_ptr<TaskProfile>, std::less<>> profiles_;
+    std::map<std::string, std::unique_ptr<IProfileAttribute>, std::less<>> attributes_;
 };
diff --git a/libsparse/Android.bp b/libsparse/Android.bp
index 02bfee6..8e83e16 100644
--- a/libsparse/Android.bp
+++ b/libsparse/Android.bp
@@ -80,16 +80,12 @@
 }
 
 python_binary_host {
-    name: "simg_dump.py",
+    name: "simg_dump",
     main: "simg_dump.py",
     srcs: ["simg_dump.py"],
     version: {
-        py2: {
-            enabled: false,
-        },
         py3: {
             embedded_launcher: true,
-            enabled: true,
         },
     },
 }
diff --git a/libsparse/append2simg.cpp b/libsparse/append2simg.cpp
index 99f4339..d3a43a8 100644
--- a/libsparse/append2simg.cpp
+++ b/libsparse/append2simg.cpp
@@ -64,60 +64,60 @@
     input_path = argv[2];
   } else {
     usage();
-    exit(-1);
+    exit(EXIT_FAILURE);
   }
 
   ret = asprintf(&tmp_path, "%s.append2simg", output_path);
   if (ret < 0) {
     fprintf(stderr, "Couldn't allocate filename\n");
-    exit(-1);
+    exit(EXIT_FAILURE);
   }
 
   output = open(output_path, O_RDWR | O_BINARY);
   if (output < 0) {
     fprintf(stderr, "Couldn't open output file (%s)\n", strerror(errno));
-    exit(-1);
+    exit(EXIT_FAILURE);
   }
 
   sparse_output = sparse_file_import_auto(output, false, true);
   if (!sparse_output) {
     fprintf(stderr, "Couldn't import output file\n");
-    exit(-1);
+    exit(EXIT_FAILURE);
   }
 
   input = open(input_path, O_RDONLY | O_BINARY);
   if (input < 0) {
     fprintf(stderr, "Couldn't open input file (%s)\n", strerror(errno));
-    exit(-1);
+    exit(EXIT_FAILURE);
   }
 
   input_len = lseek64(input, 0, SEEK_END);
   if (input_len < 0) {
     fprintf(stderr, "Couldn't get input file length (%s)\n", strerror(errno));
-    exit(-1);
+    exit(EXIT_FAILURE);
   } else if (input_len % sparse_output->block_size) {
     fprintf(stderr, "Input file is not a multiple of the output file's block size");
-    exit(-1);
+    exit(EXIT_FAILURE);
   }
   lseek64(input, 0, SEEK_SET);
 
   output_block = sparse_output->len / sparse_output->block_size;
   if (sparse_file_add_fd(sparse_output, input, 0, input_len, output_block) < 0) {
     fprintf(stderr, "Couldn't add input file\n");
-    exit(-1);
+    exit(EXIT_FAILURE);
   }
   sparse_output->len += input_len;
 
   tmp_fd = open(tmp_path, O_WRONLY | O_CREAT | O_BINARY, 0664);
   if (tmp_fd < 0) {
     fprintf(stderr, "Couldn't open temporary file (%s)\n", strerror(errno));
-    exit(-1);
+    exit(EXIT_FAILURE);
   }
 
   lseek64(output, 0, SEEK_SET);
   if (sparse_file_write(sparse_output, tmp_fd, false, true, false) < 0) {
     fprintf(stderr, "Failed to write sparse file\n");
-    exit(-1);
+    exit(EXIT_FAILURE);
   }
 
   sparse_file_destroy(sparse_output);
@@ -128,10 +128,10 @@
   ret = rename(tmp_path, output_path);
   if (ret < 0) {
     fprintf(stderr, "Failed to rename temporary file (%s)\n", strerror(errno));
-    exit(-1);
+    exit(EXIT_FAILURE);
   }
 
   free(tmp_path);
 
-  exit(0);
+  exit(EXIT_SUCCESS);
 }
diff --git a/libsparse/img2simg.cpp b/libsparse/img2simg.cpp
index 3e24cc0..c390506 100644
--- a/libsparse/img2simg.cpp
+++ b/libsparse/img2simg.cpp
@@ -38,48 +38,67 @@
 #endif
 
 void usage() {
-  fprintf(stderr, "Usage: img2simg <raw_image_file> <sparse_image_file> [<block_size>]\n");
+  fprintf(stderr, "Usage: img2simg [-s] <raw_image_file> <sparse_image_file> [<block_size>]\n");
 }
 
 int main(int argc, char* argv[]) {
+  char *arg_in;
+  char *arg_out;
+  enum sparse_read_mode mode = SPARSE_READ_MODE_NORMAL;
+  int extra;
   int in;
+  int opt;
   int out;
   int ret;
   struct sparse_file* s;
   unsigned int block_size = 4096;
   off64_t len;
 
-  if (argc < 3 || argc > 4) {
-    usage();
-    exit(-1);
+  while ((opt = getopt(argc, argv, "s")) != -1) {
+    switch (opt) {
+      case 's':
+        mode = SPARSE_READ_MODE_HOLE;
+        break;
+      default:
+        usage();
+        exit(EXIT_FAILURE);
+    }
   }
 
-  if (argc == 4) {
-    block_size = atoi(argv[3]);
+  extra = argc - optind;
+  if (extra < 2 || extra > 3) {
+    usage();
+    exit(EXIT_FAILURE);
+  }
+
+  if (extra == 3) {
+    block_size = atoi(argv[optind + 2]);
   }
 
   if (block_size < 1024 || block_size % 4 != 0) {
     usage();
-    exit(-1);
+    exit(EXIT_FAILURE);
   }
 
-  if (strcmp(argv[1], "-") == 0) {
+  arg_in = argv[optind];
+  if (strcmp(arg_in, "-") == 0) {
     in = STDIN_FILENO;
   } else {
-    in = open(argv[1], O_RDONLY | O_BINARY);
+    in = open(arg_in, O_RDONLY | O_BINARY);
     if (in < 0) {
-      fprintf(stderr, "Cannot open input file %s\n", argv[1]);
-      exit(-1);
+      fprintf(stderr, "Cannot open input file %s\n", arg_in);
+      exit(EXIT_FAILURE);
     }
   }
 
-  if (strcmp(argv[2], "-") == 0) {
+  arg_out = argv[optind + 1];
+  if (strcmp(arg_out, "-") == 0) {
     out = STDOUT_FILENO;
   } else {
-    out = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0664);
+    out = open(arg_out, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0664);
     if (out < 0) {
-      fprintf(stderr, "Cannot open output file %s\n", argv[2]);
-      exit(-1);
+      fprintf(stderr, "Cannot open output file %s\n", arg_out);
+      exit(EXIT_FAILURE);
     }
   }
 
@@ -89,24 +108,24 @@
   s = sparse_file_new(block_size, len);
   if (!s) {
     fprintf(stderr, "Failed to create sparse file\n");
-    exit(-1);
+    exit(EXIT_FAILURE);
   }
 
   sparse_file_verbose(s);
-  ret = sparse_file_read(s, in, SPARSE_READ_MODE_NORMAL, false);
+  ret = sparse_file_read(s, in, mode, false);
   if (ret) {
     fprintf(stderr, "Failed to read file\n");
-    exit(-1);
+    exit(EXIT_FAILURE);
   }
 
   ret = sparse_file_write(s, out, false, true, false);
   if (ret) {
     fprintf(stderr, "Failed to write sparse file\n");
-    exit(-1);
+    exit(EXIT_FAILURE);
   }
 
   close(in);
   close(out);
 
-  exit(0);
+  exit(EXIT_SUCCESS);
 }
diff --git a/libsparse/simg2img.cpp b/libsparse/simg2img.cpp
index 8ba5f69..2301a83 100644
--- a/libsparse/simg2img.cpp
+++ b/libsparse/simg2img.cpp
@@ -41,13 +41,13 @@
 
   if (argc < 3) {
     usage();
-    exit(-1);
+    exit(EXIT_FAILURE);
   }
 
   out = open(argv[argc - 1], O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0664);
   if (out < 0) {
     fprintf(stderr, "Cannot open output file %s\n", argv[argc - 1]);
-    exit(-1);
+    exit(EXIT_FAILURE);
   }
 
   for (i = 1; i < argc - 1; i++) {
@@ -57,14 +57,14 @@
       in = open(argv[i], O_RDONLY | O_BINARY);
       if (in < 0) {
         fprintf(stderr, "Cannot open input file %s\n", argv[i]);
-        exit(-1);
+        exit(EXIT_FAILURE);
       }
     }
 
     s = sparse_file_import(in, true, false);
     if (!s) {
       fprintf(stderr, "Failed to read sparse file\n");
-      exit(-1);
+      exit(EXIT_FAILURE);
     }
 
     if (lseek(out, 0, SEEK_SET) == -1) {
@@ -74,7 +74,7 @@
 
     if (sparse_file_write(s, out, false, false, false) < 0) {
       fprintf(stderr, "Cannot write output file\n");
-      exit(-1);
+      exit(EXIT_FAILURE);
     }
     sparse_file_destroy(s);
     close(in);
@@ -82,5 +82,5 @@
 
   close(out);
 
-  exit(0);
+  exit(EXIT_SUCCESS);
 }
diff --git a/libsparse/simg2simg.cpp b/libsparse/simg2simg.cpp
deleted file mode 100644
index a2c296e..0000000
--- a/libsparse/simg2simg.cpp
+++ /dev/null
@@ -1,111 +0,0 @@
-/*
- * Copyright (C) 2012 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#define _FILE_OFFSET_BITS 64
-#define _LARGEFILE64_SOURCE 1
-
-#include <fcntl.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-#include <sparse/sparse.h>
-
-#ifndef O_BINARY
-#define O_BINARY 0
-#endif
-
-void usage() {
-  fprintf(stderr, "Usage: simg2simg <sparse image file> <sparse_image_file> <max_size>\n");
-}
-
-int main(int argc, char* argv[]) {
-  int in;
-  int out;
-  int i;
-  int ret;
-  struct sparse_file* s;
-  int64_t max_size;
-  struct sparse_file** out_s;
-  int files;
-  char filename[4096];
-
-  if (argc != 4) {
-    usage();
-    exit(-1);
-  }
-
-  max_size = atoll(argv[3]);
-
-  in = open(argv[1], O_RDONLY | O_BINARY);
-  if (in < 0) {
-    fprintf(stderr, "Cannot open input file %s\n", argv[1]);
-    exit(-1);
-  }
-
-  s = sparse_file_import(in, true, false);
-  if (!s) {
-    fprintf(stderr, "Failed to import sparse file\n");
-    exit(-1);
-  }
-
-  files = sparse_file_resparse(s, max_size, nullptr, 0);
-  if (files < 0) {
-    fprintf(stderr, "Failed to resparse\n");
-    exit(-1);
-  }
-
-  out_s = calloc(sizeof(struct sparse_file*), files);
-  if (!out_s) {
-    fprintf(stderr, "Failed to allocate sparse file array\n");
-    exit(-1);
-  }
-
-  files = sparse_file_resparse(s, max_size, out_s, files);
-  if (files < 0) {
-    fprintf(stderr, "Failed to resparse\n");
-    exit(-1);
-  }
-
-  for (i = 0; i < files; i++) {
-    ret = snprintf(filename, sizeof(filename), "%s.%d", argv[2], i);
-    if (ret >= (int)sizeof(filename)) {
-      fprintf(stderr, "Filename too long\n");
-      exit(-1);
-    }
-
-    out = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0664);
-    if (out < 0) {
-      fprintf(stderr, "Cannot open output file %s\n", argv[2]);
-      exit(-1);
-    }
-
-    ret = sparse_file_write(out_s[i], out, false, true, false);
-    if (ret) {
-      fprintf(stderr, "Failed to write sparse file\n");
-      exit(-1);
-    }
-    close(out);
-  }
-
-  close(in);
-
-  exit(0);
-}
diff --git a/libsparse/simg_dump.py b/libsparse/simg_dump.py
index 8811a52..47537ca 100755
--- a/libsparse/simg_dump.py
+++ b/libsparse/simg_dump.py
@@ -158,7 +158,7 @@
           curtype = format("Fill with 0x%08X" % (fill))
           if showhash:
             h = hashlib.sha1()
-            data = fill_bin * (blk_sz / 4);
+            data = fill_bin * (blk_sz // 4);
             for block in range(chunk_sz):
               h.update(data)
             curhash = h.hexdigest()
diff --git a/libsparse/sparse_fuzzer.cpp b/libsparse/sparse_fuzzer.cpp
index 235d15d..663c812 100644
--- a/libsparse/sparse_fuzzer.cpp
+++ b/libsparse/sparse_fuzzer.cpp
@@ -23,5 +23,7 @@
   if (!file) {
       return 0;
   }
-  return sparse_file_callback(file, false, false, WriteCallback, nullptr);
+  int32_t result = sparse_file_callback(file, false, false, WriteCallback, nullptr);
+  sparse_file_destroy(file);
+  return result;
 }
diff --git a/libsparse/sparse_read.cpp b/libsparse/sparse_read.cpp
index 028b6be..44f7557 100644
--- a/libsparse/sparse_read.cpp
+++ b/libsparse/sparse_read.cpp
@@ -670,7 +670,7 @@
   int64_t len;
   int ret;
 
-  s = sparse_file_import(fd, verbose, crc);
+  s = sparse_file_import(fd, false, crc);
   if (s) {
     return s;
   }
@@ -686,6 +686,9 @@
   if (!s) {
     return nullptr;
   }
+  if (verbose) {
+    sparse_file_verbose(s);
+  }
 
   ret = sparse_file_read_normal(s, fd);
   if (ret < 0) {
diff --git a/libstats/pull_lazy/TEST_MAPPING b/libstats/pull_lazy/TEST_MAPPING
index 92f1e6a..0282a03 100644
--- a/libstats/pull_lazy/TEST_MAPPING
+++ b/libstats/pull_lazy/TEST_MAPPING
@@ -4,7 +4,7 @@
       "name" : "libstatspull_lazy_test"
     }
   ],
-  "hwasan-postsubmit" : [
+  "hwasan-presubmit" : [
     {
       "name" : "libstatspull_lazy_test"
     }
diff --git a/libstats/pull_rust/Android.bp b/libstats/pull_rust/Android.bp
index 4ffa98d..85a38f8 100644
--- a/libstats/pull_rust/Android.bp
+++ b/libstats/pull_rust/Android.bp
@@ -22,6 +22,10 @@
     name: "libstatspull_bindgen",
     wrapper_src: "statslog.h",
     crate_name: "statspull_bindgen",
+    visibility: [
+        "//frameworks/proto_logging/stats/stats_log_api_gen",
+        "//packages/modules/Virtualization/libs/statslog_virtualization",
+    ],
     source_stem: "bindings",
     bindgen_flags: [
         "--size_t-is-usize",
@@ -47,8 +51,9 @@
     min_sdk_version: "apex_inherit",
     apex_available: [
         "//apex_available:platform",
+        "com.android.resolv",
         "com.android.virt",
-    ]
+    ],
 }
 
 rust_library {
diff --git a/libstats/push_compat/statsd_writer.c b/libstats/push_compat/statsd_writer.c
index 04d3b46..4818d11 100644
--- a/libstats/push_compat/statsd_writer.c
+++ b/libstats/push_compat/statsd_writer.c
@@ -61,7 +61,7 @@
 static int statsdOpen();
 static void statsdClose();
 static int statsdWrite(struct timespec* ts, struct iovec* vec, size_t nr);
-static void statsdNoteDrop();
+static void statsdNoteDrop(int error, int tag);
 
 struct android_log_transport_write statsdLoggerWrite = {
         .name = "statsd",
diff --git a/libstats/socket_lazy/TEST_MAPPING b/libstats/socket_lazy/TEST_MAPPING
index b182660..03506cd 100644
--- a/libstats/socket_lazy/TEST_MAPPING
+++ b/libstats/socket_lazy/TEST_MAPPING
@@ -4,7 +4,7 @@
       "name" : "libstatssocket_lazy_test"
     }
   ],
-  "hwasan-postsubmit" : [
+  "hwasan-presubmit" : [
     {
       "name" : "libstatssocket_lazy_test"
     }
diff --git a/libsync/Android.bp b/libsync/Android.bp
index 99c88cf..b6b4a6e 100644
--- a/libsync/Android.bp
+++ b/libsync/Android.bp
@@ -27,6 +27,9 @@
     name: "libsync",
     symbol_file: "libsync.map.txt",
     first_version: "26",
+    export_header_libs: [
+        "libsync_headers",
+    ],
 }
 
 cc_defaults {
diff --git a/libsync/libsync.map.txt b/libsync/libsync.map.txt
index aac6b57..32df91e 100644
--- a/libsync/libsync.map.txt
+++ b/libsync/libsync.map.txt
@@ -19,7 +19,7 @@
     sync_merge; # introduced=26
     sync_file_info; # introduced=26
     sync_file_info_free; # introduced=26
-    sync_wait; # llndk apex
+    sync_wait; # llndk systemapi
     sync_fence_info; # llndk
     sync_pt_info; # llndk
     sync_fence_info_free; # llndk
diff --git a/libsystem/include/system/graphics-base-v1.2.h b/libsystem/include/system/graphics-base-v1.2.h
index 2194f5e..624912c 100644
--- a/libsystem/include/system/graphics-base-v1.2.h
+++ b/libsystem/include/system/graphics-base-v1.2.h
@@ -14,13 +14,17 @@
 } android_hdr_v1_2_t;
 
 typedef enum {
-    HAL_DATASPACE_DISPLAY_BT2020 = 142999552 /* ((STANDARD_BT2020 | TRANSFER_SRGB) | RANGE_FULL) */,
+    HAL_DATASPACE_DISPLAY_BT2020 = 142999552 /* STANDARD_BT2020 | TRANSFER_SRGB | RANGE_FULL */,
     HAL_DATASPACE_DYNAMIC_DEPTH = 4098 /* 0x1002 */,
     HAL_DATASPACE_JPEG_APP_SEGMENTS = 4099 /* 0x1003 */,
     HAL_DATASPACE_HEIF = 4100 /* 0x1004 */,
 } android_dataspace_v1_2_t;
 
 typedef enum {
+    HAL_COLOR_MODE_DISPLAY_BT2020 = 13,
+} android_color_mode_v1_2_t;
+
+typedef enum {
     HAL_PIXEL_FORMAT_HSV_888 = 55 /* 0x37 */,
 } android_pixel_format_v1_2_t;
 
diff --git a/libutils/Android.bp b/libutils/Android.bp
index 019a368..162f0f4 100644
--- a/libutils/Android.bp
+++ b/libutils/Android.bp
@@ -21,11 +21,13 @@
     vendor_ramdisk_available: true,
     host_supported: true,
     native_bridge_supported: true,
+    defaults: [
+        "apex-lowest-min-sdk-version",
+    ],
     apex_available: [
         "//apex_available:platform",
         "//apex_available:anyapex",
     ],
-    min_sdk_version: "apex_inherit",
 
     header_libs: [
         "libbase_headers",
@@ -44,14 +46,6 @@
     export_include_dirs: ["include"],
 
     target: {
-        android: {
-            header_libs: ["libbacktrace_headers"],
-            export_header_lib_headers: ["libbacktrace_headers"],
-        },
-        host_linux: {
-            header_libs: ["libbacktrace_headers"],
-            export_header_lib_headers: ["libbacktrace_headers"],
-        },
         linux_bionic: {
             enabled: true,
         },
@@ -66,10 +60,6 @@
     vendor_available: true,
     product_available: true,
     recovery_available: true,
-    vndk: {
-        enabled: true,
-        support_system_process: true,
-    },
     host_supported: true,
 
     cflags: [
@@ -134,9 +124,12 @@
     },
 }
 
-cc_library {
-    name: "libutils",
-    defaults: ["libutils_defaults"],
+cc_defaults {
+    name: "libutils_impl_defaults",
+    defaults: [
+        "libutils_defaults",
+        "apex-lowest-min-sdk-version",
+    ],
     native_bridge_supported: true,
 
     srcs: [
@@ -179,21 +172,50 @@
         "//apex_available:anyapex",
         "//apex_available:platform",
     ],
-    min_sdk_version: "apex_inherit",
 
     afdo: true,
+}
+
+cc_library {
+    name: "libutils",
+    defaults: ["libutils_impl_defaults"],
+
+    vndk: {
+        enabled: true,
+        support_system_process: true,
+    },
 
     header_abi_checker: {
+        // AFDO affects weak symbols.
         diff_flags: ["-allow-adding-removing-weak-symbols"],
+        ref_dump_dirs: ["abi-dumps"],
     },
 }
 
 cc_library {
+    name: "libutils_test_compile",
+    defaults: ["libutils_impl_defaults"],
+
+    cflags: [
+        "-DCALLSTACKS=1",
+        "-DDEBUG_POLL_AND_WAKE=1",
+        "-DDEBUG_REFS=1",
+        "-DDEBUG_TOKENIZER=1",
+    ],
+
+    visibility: [":__subpackages__"],
+}
+
+cc_library {
     name: "libutilscallstack",
     defaults: ["libutils_defaults"],
     // TODO(b/153609531): remove when no longer needed.
     native_bridge_supported: true,
     min_sdk_version: "29",
+    vndk: {
+        enabled: true,
+        support_system_process: true,
+    },
 
     srcs: [
         "CallStack.cpp",
@@ -201,7 +223,7 @@
 
     shared_libs: [
         "libutils",
-        "libbacktrace",
+        "libunwindstack",
     ],
 
     target: {
@@ -307,6 +329,7 @@
 
     srcs: [
         "BitSet_test.cpp",
+        "CallStack_test.cpp",
         "Errors_test.cpp",
         "FileMap_test.cpp",
         "LruCache_test.cpp",
@@ -327,11 +350,14 @@
                 "SystemClock_test.cpp",
             ],
             shared_libs: [
-                "libz",
-                "liblog",
-                "libcutils",
-                "libutils",
                 "libbase",
+                "libcutils",
+                "liblog",
+                "liblzma",
+                "libunwindstack",
+                "libutils",
+                "libutilscallstack",
+                "libz",
             ],
         },
         linux: {
@@ -342,9 +368,12 @@
         },
         host: {
             static_libs: [
-                "libutils",
-                "liblog",
                 "libbase",
+                "liblog",
+                "liblzma",
+                "libunwindstack_no_dex",
+                "libutils",
+                "libutilscallstack",
             ],
         },
     },
diff --git a/libutils/CallStack.cpp b/libutils/CallStack.cpp
index fe6f33d..4dcb35b 100644
--- a/libutils/CallStack.cpp
+++ b/libutils/CallStack.cpp
@@ -20,7 +20,7 @@
 #include <utils/Errors.h>
 #include <utils/Log.h>
 
-#include <backtrace/Backtrace.h>
+#include <unwindstack/AndroidUnwinder.h>
 
 #define CALLSTACK_WEAK  // Don't generate weak definitions.
 #include <utils/CallStack.h>
@@ -39,14 +39,25 @@
 }
 
 void CallStack::update(int32_t ignoreDepth, pid_t tid) {
+    if (ignoreDepth < 0) {
+        ignoreDepth = 0;
+    }
+
     mFrameLines.clear();
 
-    std::unique_ptr<Backtrace> backtrace(Backtrace::Create(BACKTRACE_CURRENT_PROCESS, tid));
-    if (!backtrace->Unwind(ignoreDepth)) {
-        ALOGW("%s: Failed to unwind callstack.", __FUNCTION__);
+    unwindstack::AndroidLocalUnwinder unwinder;
+    unwindstack::AndroidUnwinderData data;
+    std::optional<pid_t> tid_val;
+    if (tid != -1) {
+        tid_val = tid;
     }
-    for (size_t i = 0; i < backtrace->NumFrames(); i++) {
-      mFrameLines.push_back(String8(backtrace->FormatFrameData(i).c_str()));
+    if (!unwinder.Unwind(tid_val, data)) {
+        ALOGW("%s: Failed to unwind callstack: %s", __FUNCTION__, data.GetErrorString().c_str());
+    }
+    for (size_t i = ignoreDepth; i < data.frames.size(); i++) {
+        auto& frame = data.frames[i];
+        frame.num -= ignoreDepth;
+        mFrameLines.push_back(String8(unwinder.FormatFrame(frame).c_str()));
     }
 }
 
diff --git a/libutils/CallStack_test.cpp b/libutils/CallStack_test.cpp
new file mode 100644
index 0000000..2cfaf61
--- /dev/null
+++ b/libutils/CallStack_test.cpp
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <unistd.h>
+
+#include <thread>
+
+#include <android-base/threads.h>
+#include <gtest/gtest.h>
+#include <utils/CallStack.h>
+
+__attribute__((__noinline__)) extern "C" void CurrentCaller(android::String8& backtrace) {
+    android::CallStack cs;
+    cs.update();
+    backtrace = cs.toString();
+}
+
+TEST(CallStackTest, current_backtrace) {
+    android::String8 backtrace;
+    CurrentCaller(backtrace);
+
+    ASSERT_NE(-1, backtrace.find("(CurrentCaller")) << "Full backtrace:\n" << backtrace;
+}
+
+__attribute__((__noinline__)) extern "C" void ThreadBusyWait(std::atomic<pid_t>* tid,
+                                                             volatile bool* done) {
+    *tid = android::base::GetThreadId();
+    while (!*done) {
+    }
+}
+
+TEST(CallStackTest, thread_backtrace) {
+    // Use a volatile to avoid any problems unwinding since sometimes
+    // accessing a std::atomic does not include unwind data at every
+    // instruction and leads to failed unwinds.
+    volatile bool done = false;
+    std::atomic<pid_t> tid = -1;
+    std::thread thread([&tid, &done]() { ThreadBusyWait(&tid, &done); });
+
+    while (tid == -1) {
+    }
+
+    android::CallStack cs;
+    cs.update(0, tid);
+
+    done = true;
+    thread.join();
+
+    ASSERT_NE(-1, cs.toString().find("(ThreadBusyWait")) << "Full backtrace:\n" << cs.toString();
+}
diff --git a/libutils/Looper.cpp b/libutils/Looper.cpp
index 1a3f34b..402e43c 100644
--- a/libutils/Looper.cpp
+++ b/libutils/Looper.cpp
@@ -8,10 +8,14 @@
 //#define LOG_NDEBUG 0
 
 // Debugs poll and wake interactions.
+#ifndef DEBUG_POLL_AND_WAKE
 #define DEBUG_POLL_AND_WAKE 0
+#endif
 
 // Debugs callback registration and invocation.
+#ifndef DEBUG_CALLBACKS
 #define DEBUG_CALLBACKS 0
+#endif
 
 #include <utils/Looper.h>
 
diff --git a/libutils/RefBase.cpp b/libutils/RefBase.cpp
index 4ddac3d..ab122c7 100644
--- a/libutils/RefBase.cpp
+++ b/libutils/RefBase.cpp
@@ -21,9 +21,11 @@
 
 #include <android-base/macros.h>
 
+#include <fcntl.h>
 #include <log/log.h>
 
 #include <utils/RefBase.h>
+#include <utils/String8.h>
 
 #include <utils/Mutex.h>
 
@@ -32,7 +34,9 @@
 #endif
 
 // Compile with refcounting debugging enabled.
+#ifndef DEBUG_REFS
 #define DEBUG_REFS 0
+#endif
 
 // The following three are ignored unless DEBUG_REFS is set.
 
@@ -45,7 +49,11 @@
 
 // folder where stack traces are saved when DEBUG_REFS is enabled
 // this folder needs to exist and be writable
+#ifdef __ANDROID__
 #define DEBUG_REFS_CALLSTACK_PATH "/data/debug"
+#else
+#define DEBUG_REFS_CALLSTACK_PATH "."
+#endif
 
 // log all reference counting operations
 #define PRINT_REFS 0
@@ -149,6 +157,29 @@
 // Same for weak counts.
 #define BAD_WEAK(c) ((c) == 0 || ((c) & (~MAX_COUNT)) != 0)
 
+// name kept because prebuilts used to use it from inlining sp<> code
+void sp_report_stack_pointer() { LOG_ALWAYS_FATAL("RefBase used with stack pointer argument"); }
+
+// Check whether address is definitely on the calling stack.  We actually check whether it is on
+// the same 4K page as the frame pointer.
+//
+// Assumptions:
+// - Pages are never smaller than 4K (MIN_PAGE_SIZE)
+// - Malloced memory never shares a page with a stack.
+//
+// It does not appear safe to broaden this check to include adjacent pages; apparently this code
+// is used in environments where there may not be a guard page below (at higher addresses than)
+// the bottom of the stack.
+static void check_not_on_stack(const void* ptr) {
+    static constexpr int MIN_PAGE_SIZE = 0x1000;  // 4K. Safer than including sys/user.h.
+    static constexpr uintptr_t MIN_PAGE_MASK = ~static_cast<uintptr_t>(MIN_PAGE_SIZE - 1);
+    uintptr_t my_frame_address =
+            reinterpret_cast<uintptr_t>(__builtin_frame_address(0 /* this frame */));
+    if (((reinterpret_cast<uintptr_t>(ptr) ^ my_frame_address) & MIN_PAGE_MASK) == 0) {
+        sp_report_stack_pointer();
+    }
+}
+
 // ---------------------------------------------------------------------------
 
 class RefBase::weakref_impl : public RefBase::weakref_type
@@ -297,11 +328,11 @@
             char name[100];
             snprintf(name, sizeof(name), DEBUG_REFS_CALLSTACK_PATH "/%p.stack",
                      this);
-            int rc = open(name, O_RDWR | O_CREAT | O_APPEND, 644);
+            int rc = open(name, O_RDWR | O_CREAT | O_APPEND, 0644);
             if (rc >= 0) {
                 (void)write(rc, text.string(), text.length());
                 close(rc);
-                ALOGD("STACK TRACE for %p saved in %s", this, name);
+                ALOGI("STACK TRACE for %p saved in %s", this, name);
             }
             else ALOGE("FAILED TO PRINT STACK TRACE for %p in %s: %s", this,
                       name, strerror(errno));
@@ -432,6 +463,8 @@
         return;
     }
 
+    check_not_on_stack(this);
+
     int32_t old __unused = refs->mStrong.fetch_sub(INITIAL_STRONG_VALUE, std::memory_order_relaxed);
     // A decStrong() must still happen after us.
     ALOG_ASSERT(old > INITIAL_STRONG_VALUE, "0x%x too small", old);
@@ -744,21 +777,27 @@
         if (mRefs->mWeak.load(std::memory_order_relaxed) == 0) {
             delete mRefs;
         }
-    } else if (mRefs->mStrong.load(std::memory_order_relaxed) == INITIAL_STRONG_VALUE) {
-        // We never acquired a strong reference on this object.
+    } else {
+        int32_t strongs = mRefs->mStrong.load(std::memory_order_relaxed);
 
-        // TODO: make this fatal, but too much code in Android manages RefBase with
-        // new/delete manually (or using other mechanisms such as std::make_unique).
-        // However, this is dangerous because it's also common for code to use the
-        // sp<T>(T*) constructor, assuming that if the object is around, it is already
-        // owned by an sp<>.
-        ALOGW("RefBase: Explicit destruction, weak count = %d (in %p). Use sp<> to manage this "
-              "object.",
-              mRefs->mWeak.load(), this);
+        if (strongs == INITIAL_STRONG_VALUE) {
+            // We never acquired a strong reference on this object.
+
+            // It would be nice to make this fatal, but many places use RefBase on the stack.
+            // However, this is dangerous because it's also common for code to use the
+            // sp<T>(T*) constructor, assuming that if the object is around, it is already
+            // owned by an sp<>.
+            ALOGW("RefBase: Explicit destruction, weak count = %d (in %p). Use sp<> to manage this "
+                  "object.",
+                  mRefs->mWeak.load(), this);
 
 #if CALLSTACK_ENABLED
-        CallStack::logStack(LOG_TAG);
+            CallStack::logStack(LOG_TAG);
 #endif
+        } else if (strongs != 0) {
+            LOG_ALWAYS_FATAL("RefBase: object %p with strong count %d deleted. Double owned?", this,
+                             strongs);
+        }
     }
     // For debugging purposes, clear mRefs.  Ineffective against outstanding wp's.
     const_cast<weakref_impl*&>(mRefs) = nullptr;
@@ -766,6 +805,8 @@
 
 void RefBase::extendObjectLifetime(int32_t mode)
 {
+    check_not_on_stack(this);
+
     // Must be happens-before ordered with respect to construction or any
     // operation that could destroy the object.
     mRefs->mFlags.fetch_or(mode, std::memory_order_relaxed);
diff --git a/libutils/RefBase_test.cpp b/libutils/RefBase_test.cpp
index 93f9654..aed3b9b 100644
--- a/libutils/RefBase_test.cpp
+++ b/libutils/RefBase_test.cpp
@@ -265,6 +265,21 @@
     delete foo;
 }
 
+TEST(RefBase, DoubleOwnershipDeath) {
+    bool isDeleted;
+    auto foo = sp<Foo>::make(&isDeleted);
+
+    // if something else thinks it owns foo, should die
+    EXPECT_DEATH(delete foo.get(), "");
+
+    EXPECT_FALSE(isDeleted);
+}
+
+TEST(RefBase, StackOwnershipDeath) {
+    bool isDeleted;
+    EXPECT_DEATH({ Foo foo(&isDeleted); foo.incStrong(nullptr); }, "");
+}
+
 // Set up a situation in which we race with visit2AndRremove() to delete
 // 2 strong references.  Bar destructor checks that there are no early
 // deletions and prior updates are visible to destructor.
diff --git a/libutils/String8.cpp b/libutils/String8.cpp
index 3690389..82f5cb6 100644
--- a/libutils/String8.cpp
+++ b/libutils/String8.cpp
@@ -25,6 +25,7 @@
 
 #include <ctype.h>
 
+#include <limits>
 #include <string>
 
 #include "SharedBuffer.h"
diff --git a/libutils/StrongPointer.cpp b/libutils/StrongPointer.cpp
index ef46723..ba52502 100644
--- a/libutils/StrongPointer.cpp
+++ b/libutils/StrongPointer.cpp
@@ -21,7 +21,4 @@
 namespace android {
 
 void sp_report_race() { LOG_ALWAYS_FATAL("sp<> assignment detected data race"); }
-
-void sp_report_stack_pointer() { LOG_ALWAYS_FATAL("sp<> constructed with stack pointer argument"); }
-
 }
diff --git a/libutils/Tokenizer.cpp b/libutils/Tokenizer.cpp
index 98dd2fd..c3ec165 100644
--- a/libutils/Tokenizer.cpp
+++ b/libutils/Tokenizer.cpp
@@ -21,9 +21,10 @@
 #include <sys/stat.h>
 #include <utils/Log.h>
 
+#ifndef DEBUG_TOKENIZER
 // Enables debug output for the tokenizer.
 #define DEBUG_TOKENIZER 0
-
+#endif
 
 namespace android {
 
diff --git a/libutils/Unicode_test.cpp b/libutils/Unicode_test.cpp
index 8b994d9..7969525 100644
--- a/libutils/Unicode_test.cpp
+++ b/libutils/Unicode_test.cpp
@@ -35,86 +35,208 @@
     }
 
     char16_t const * const kSearchString = u"I am a leaf on the wind.";
+
+    constexpr static size_t BUFSIZE = 64;       // large enough for all tests
+
+    void TestUTF8toUTF16(std::initializer_list<uint8_t> input,
+                         std::initializer_list<char16_t> expect,
+                         const char* err_msg_length = "",
+                         ssize_t expected_length = 0) {
+        uint8_t empty_str[] = {};
+        char16_t output[BUFSIZE];
+
+        const size_t inlen = input.size(), outlen = expect.size();
+        ASSERT_LT(outlen, BUFSIZE);
+
+        const uint8_t *input_data = inlen ? std::data(input) : empty_str;
+        ssize_t measured = utf8_to_utf16_length(input_data, inlen);
+        EXPECT_EQ(expected_length ? : (ssize_t)outlen, measured) << err_msg_length;
+
+        utf8_to_utf16(input_data, inlen, output, outlen + 1);
+        for (size_t i = 0; i < outlen; i++) {
+            EXPECT_EQ(std::data(expect)[i], output[i]);
+        }
+        EXPECT_EQ(0, output[outlen]) << "should be null terminated";
+    }
+
+    void TestUTF16toUTF8(std::initializer_list<char16_t> input,
+                         std::initializer_list<char> expect,
+                         const char* err_msg_length = "",
+                         ssize_t expected_length = 0) {
+        char16_t empty_str[] = {};
+        char output[BUFSIZE];
+
+        const size_t inlen = input.size(), outlen = expect.size();
+        ASSERT_LT(outlen, BUFSIZE);
+
+        const char16_t *input_data = inlen ? std::data(input) : empty_str;
+        ssize_t measured = utf16_to_utf8_length(input_data, inlen);
+        EXPECT_EQ(expected_length ? : (ssize_t)outlen, measured) << err_msg_length;
+
+        utf16_to_utf8(input_data, inlen, output, outlen + 1);
+        for (size_t i = 0; i < outlen; i++) {
+            EXPECT_EQ(std::data(expect)[i], output[i]);
+        }
+        EXPECT_EQ(0, output[outlen]) << "should be null terminated";
+    }
 };
 
 TEST_F(UnicodeTest, UTF8toUTF16ZeroLength) {
-    ssize_t measured;
-
-    const uint8_t str[] = { };
-
-    measured = utf8_to_utf16_length(str, 0);
-    EXPECT_EQ(0, measured)
-            << "Zero length input should return zero length output.";
+    TestUTF8toUTF16({}, {},
+        "Zero length input should return zero length output.");
 }
 
-TEST_F(UnicodeTest, UTF8toUTF16ASCIILength) {
-    ssize_t measured;
-
-    // U+0030 or ASCII '0'
-    const uint8_t str[] = { 0x30 };
-
-    measured = utf8_to_utf16_length(str, sizeof(str));
-    EXPECT_EQ(1, measured)
-            << "ASCII glyphs should have a length of 1 char16_t";
+TEST_F(UnicodeTest, UTF8toUTF16ASCII) {
+    TestUTF8toUTF16(
+        { 0x30 },               // U+0030 or ASCII '0'
+        { 0x0030 },
+        "ASCII codepoints should have a length of 1 char16_t");
 }
 
-TEST_F(UnicodeTest, UTF8toUTF16Plane1Length) {
-    ssize_t measured;
-
-    // U+2323 SMILE
-    const uint8_t str[] = { 0xE2, 0x8C, 0xA3 };
-
-    measured = utf8_to_utf16_length(str, sizeof(str));
-    EXPECT_EQ(1, measured)
-            << "Plane 1 glyphs should have a length of 1 char16_t";
+TEST_F(UnicodeTest, UTF8toUTF16Plane1) {
+    TestUTF8toUTF16(
+        { 0xE2, 0x8C, 0xA3 },   // U+2323 SMILE
+        { 0x2323 },
+        "Plane 1 codepoints should have a length of 1 char16_t");
 }
 
-TEST_F(UnicodeTest, UTF8toUTF16SurrogateLength) {
-    ssize_t measured;
-
-    // U+10000
-    const uint8_t str[] = { 0xF0, 0x90, 0x80, 0x80 };
-
-    measured = utf8_to_utf16_length(str, sizeof(str));
-    EXPECT_EQ(2, measured)
-            << "Surrogate pairs should have a length of 2 char16_t";
+TEST_F(UnicodeTest, UTF8toUTF16Surrogate) {
+    TestUTF8toUTF16(
+        { 0xF0, 0x90, 0x80, 0x80 },   // U+10000
+        { 0xD800, 0xDC00 },
+        "Surrogate pairs should have a length of 2 char16_t");
 }
 
 TEST_F(UnicodeTest, UTF8toUTF16TruncatedUTF8) {
-    ssize_t measured;
-
-    // Truncated U+2323 SMILE
-    // U+2323 SMILE
-    const uint8_t str[] = { 0xE2, 0x8C };
-
-    measured = utf8_to_utf16_length(str, sizeof(str));
-    EXPECT_EQ(-1, measured)
-            << "Truncated UTF-8 should return -1 to indicate invalid";
+    TestUTF8toUTF16(
+        { 0xE2, 0x8C },       // Truncated U+2323 SMILE
+        { },                  // Conversion should still work but produce nothing
+        "Truncated UTF-8 should return -1 to indicate invalid",
+        -1);
 }
 
 TEST_F(UnicodeTest, UTF8toUTF16Normal) {
-    const uint8_t str[] = {
-        0x30, // U+0030, 1 UTF-16 character
-        0xC4, 0x80, // U+0100, 1 UTF-16 character
-        0xE2, 0x8C, 0xA3, // U+2323, 1 UTF-16 character
+    TestUTF8toUTF16({
+        0x30,                   // U+0030, 1 UTF-16 character
+        0xC4, 0x80,             // U+0100, 1 UTF-16 character
+        0xE2, 0x8C, 0xA3,       // U+2323, 1 UTF-16 character
         0xF0, 0x90, 0x80, 0x80, // U+10000, 2 UTF-16 character
-    };
+    }, {
+        0x0030,
+        0x0100,
+        0x2323,
+        0xD800, 0xDC00
+    });
+}
 
-    char16_t output[1 + 1 + 1 + 2 + 1];  // Room for null
+TEST_F(UnicodeTest, UTF8toUTF16Invalid) {
+    // TODO: The current behavior of utf8_to_utf16 is to treat invalid
+    // leading byte (>= 0xf8) as a 4-byte UTF8 sequence, and to treat
+    // invalid trailing byte(s) (i.e. bytes not having MSB set) as if
+    // they are valid and do the normal conversion. However, a better
+    // handling would be to treat invalid sequences as errors, such
+    // cases need to be reported and invalid characters (e.g. U+FFFD)
+    // could be produced at the place of error.  Until a fix is ready
+    // and compatibility is not an issue, we will keep testing the
+    // current behavior
+    TestUTF8toUTF16({
+        0xf8,                   // invalid leading byte
+        0xc4, 0x00,             // U+0100 with invalid trailing byte
+        0xe2, 0x0c, 0xa3,       // U+2323 with invalid trailing bytes
+        0xf0, 0x10, 0x00, 0x00, // U+10000 with invalid trailing bytes
+    }, {
+        0x4022,                 // invalid leading byte (>=0xfc) is treated
+                                // as valid for 4-byte UTF8 sequence
+	0x000C,
+	0x00A3,                 // invalid leadnig byte (b'10xxxxxx) is
+                                // treated as valid single UTF-8 byte
+        0xD800,                 // invalid trailing bytes are treated
+        0xDC00,                 // as valid bytes and follow normal
+    });
+}
 
-    utf8_to_utf16(str, sizeof(str), output, sizeof(output) / sizeof(output[0]));
+TEST_F(UnicodeTest, UTF16toUTF8ZeroLength) {
+    // TODO: The current behavior of utf16_to_utf8_length() is that
+    // it returns -1 if the input is a zero length UTF16 string.
+    // This is inconsistent with utf8_to_utf16_length() where a zero
+    // length string returns 0.  However, to fix the current behavior,
+    // we could have compatibility issue.  Until then, we will keep
+    // testing the current behavior
+    TestUTF16toUTF8({}, {},
+        "Zero length UTF16 input should return length of -1.", -1);
+}
 
-    EXPECT_EQ(0x0030, output[0])
-            << "should be U+0030";
-    EXPECT_EQ(0x0100, output[1])
-            << "should be U+0100";
-    EXPECT_EQ(0x2323, output[2])
-            << "should be U+2323";
-    EXPECT_EQ(0xD800, output[3])
-            << "should be first half of surrogate U+10000";
-    EXPECT_EQ(0xDC00, output[4])
-            << "should be second half of surrogate U+10000";
-    EXPECT_EQ(0, output[5]) << "should be null terminated";
+TEST_F(UnicodeTest, UTF16toUTF8ASCII) {
+    TestUTF16toUTF8(
+        { 0x0030 },  // U+0030 or ASCII '0'
+        { '\x30' },
+        "ASCII codepoints in UTF16 should give a length of 1 in UTF8");
+}
+
+TEST_F(UnicodeTest, UTF16toUTF8Plane1) {
+    TestUTF16toUTF8(
+        { 0x2323 },  // U+2323 SMILE
+        { '\xE2', '\x8C', '\xA3' },
+        "Plane 1 codepoints should have a length of 3 char in UTF-8");
+}
+
+TEST_F(UnicodeTest, UTF16toUTF8Surrogate) {
+    TestUTF16toUTF8(
+        { 0xD800, 0xDC00 },  // U+10000
+        { '\xF0', '\x90', '\x80', '\x80' },
+        "Surrogate pairs should have a length of 4 chars");
+}
+
+TEST_F(UnicodeTest, UTF16toUTF8UnpairedSurrogate) {
+    TestUTF16toUTF8(
+        { 0xD800 },     // U+10000 with high surrogate pair only
+        { },            // Unpaired surrogate should be ignored
+        "A single unpaired high surrogate should have a length of 0 chars");
+
+    TestUTF16toUTF8(
+        { 0xDC00 },     // U+10000 with low surrogate pair only
+        { },            // Unpaired surrogate should be ignored
+        "A single unpaired low surrogate should have a length of 0 chars");
+
+    TestUTF16toUTF8(
+        // U+0030, U+0100, U+10000 with high surrogate pair only, U+2323
+        { 0x0030, 0x0100, 0xDC00, 0x2323 },
+        { '\x30', '\xC4', '\x80', '\xE2', '\x8C', '\xA3' },
+        "Unpaired high surrogate should be skipped in the middle");
+
+    TestUTF16toUTF8(
+        // U+0030, U+0100, U+10000 with high surrogate pair only, U+2323
+        { 0x0030, 0x0100, 0xDC00, 0x2323 },
+        { '\x30', '\xC4', '\x80', '\xE2', '\x8C', '\xA3' },
+        "Unpaired low surrogate should be skipped in the middle");
+}
+
+TEST_F(UnicodeTest, UTF16toUTF8CorrectInvalidSurrogate) {
+    // http://b/29250543
+    // d841d8 is an invalid start for a surrogate pair. Make sure this is handled by ignoring the
+    // first character in the pair and handling the rest correctly.
+    TestUTF16toUTF8(
+        { 0xD841, 0xD841, 0xDC41 },     // U+20441
+        { '\xF0', '\xA0', '\x91', '\x81' },
+        "Invalid start for a surrogate pair should be ignored");
+}
+
+TEST_F(UnicodeTest, UTF16toUTF8Normal) {
+    TestUTF16toUTF8({
+        0x0024, // U+0024 ($) --> 0x24,           1 UTF-8 byte
+        0x00A3, // U+00A3 (£) --> 0xC2 0xA3,      2 UTF-8 bytes
+        0x0939, // U+0939 (ह) --> 0xE0 0xA4 0xB9, 3 UTF-8 bytes
+        0x20AC, // U+20AC (€) --> 0xE2 0x82 0xAC, 3 UTF-8 bytes
+        0xD55C, // U+D55C (한)--> 0xED 0x95 0x9C, 3 UTF-8 bytes
+        0xD801, 0xDC37, // U+10437 (𐐷) --> 0xF0 0x90 0x90 0xB7, 4 UTF-8 bytes
+    }, {
+        '\x24',
+        '\xC2', '\xA3',
+        '\xE0', '\xA4', '\xB9',
+        '\xE2', '\x82', '\xAC',
+        '\xED', '\x95', '\x9C',
+        '\xF0', '\x90', '\x90', '\xB7',
+    });
 }
 
 TEST_F(UnicodeTest, strstr16EmptyTarget) {
diff --git a/libutils/abi-dumps/arm64/source-based/libutils.so.lsdump b/libutils/abi-dumps/arm64/source-based/libutils.so.lsdump
new file mode 100644
index 0000000..c89af9e
--- /dev/null
+++ b/libutils/abi-dumps/arm64/source-based/libutils.so.lsdump
@@ -0,0 +1,15553 @@
+{
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+  },
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+  },
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+  },
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+  }
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+   "return_type" : "_ZTIl",
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+   "return_type" : "_ZTIl",
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+   "linker_set_key" : "_ZN7android16SortedVectorImpl3addEPKv",
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+   "linker_set_key" : "_ZN7android16SortedVectorImpl6removeEPKv",
+   "parameters" :
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+   "source_file" : "system/core/libutils/include/utils/Looper.h"
+  },
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+   "linker_set_key" : "_ZN7android6Looper6awokenEv",
+   "parameters" :
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+   "source_file" : "system/core/libutils/include/utils/Looper.h"
+  },
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+   "linker_set_key" : "_ZN7android6Looper7pollAllEiPiS1_PPv",
+   "parameters" :
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+  },
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+   "linker_set_key" : "_ZNK7android8String169findFirstEDs",
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new file mode 100644
index 0000000..f88da15
--- /dev/null
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+   "return_type" : "_ZTIx",
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+   "return_type" : "_ZTIx",
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+   "source_file" : "system/core/libutils/include/utils/Looper.h"
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+   "function_name" : "android::Looper::scheduleEpollRebuildLocked",
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+   "parameters" :
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+   "function_name" : "android::Looper::wake",
+   "linker_set_key" : "_ZN7android6Looper4wakeEv",
+   "parameters" :
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+   "source_file" : "system/core/libutils/include/utils/Looper.h"
+  },
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+   "linker_set_key" : "_ZN7android6Looper5addFdEiiiPFiiiPvES1_",
+   "parameters" :
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+    {
+     "is_pure" : true,
+     "mangled_component_name" : "_ZN7android7Printer9printLineEPKc"
+    },
+    {
+     "mangled_component_name" : "_ZN7android7Printer15printFormatLineEPKcz"
+    },
+    {
+     "kind" : "complete_dtor_pointer",
+     "mangled_component_name" : "_ZN7android7PrinterD1Ev"
+    },
+    {
+     "kind" : "deleting_dtor_pointer",
+     "mangled_component_name" : "_ZN7android7PrinterD0Ev"
+    }
+   ]
+  },
+  {
+   "alignment" : 1,
+   "linker_set_key" : "_ZTIN7android7RefBase12weakref_typeE",
+   "name" : "android::RefBase::weakref_type",
+   "record_kind" : "class",
+   "referenced_type" : "_ZTIN7android7RefBase12weakref_typeE",
+   "self_type" : "_ZTIN7android7RefBase12weakref_typeE",
+   "size" : 1,
+   "source_file" : "system/core/libutils/include/utils/RefBase.h"
+  },
+  {
+   "alignment" : 4,
+   "fields" :
+   [
+    {
+     "access" : "private",
+     "field_name" : "mRefs",
+     "field_offset" : 32,
+     "referenced_type" : "_ZTIKPN7android7RefBase12weakref_implE"
+    }
+   ],
+   "linker_set_key" : "_ZTIN7android7RefBaseE",
+   "name" : "android::RefBase",
+   "record_kind" : "class",
+   "referenced_type" : "_ZTIN7android7RefBaseE",
+   "self_type" : "_ZTIN7android7RefBaseE",
+   "size" : 8,
+   "source_file" : "system/core/libutils/include/utils/RefBase.h",
+   "vtable_components" :
+   [
+    {
+     "kind" : "offset_to_top"
+    },
+    {
+     "kind" : "rtti",
+     "mangled_component_name" : "_ZTIN7android7RefBaseE"
+    },
+    {
+     "kind" : "complete_dtor_pointer",
+     "mangled_component_name" : "_ZN7android7RefBaseD1Ev"
+    },
+    {
+     "kind" : "deleting_dtor_pointer",
+     "mangled_component_name" : "_ZN7android7RefBaseD0Ev"
+    },
+    {
+     "mangled_component_name" : "_ZN7android7RefBase10onFirstRefEv"
+    },
+    {
+     "mangled_component_name" : "_ZN7android7RefBase15onLastStrongRefEPKv"
+    },
+    {
+     "mangled_component_name" : "_ZN7android7RefBase20onIncStrongAttemptedEjPKv"
+    },
+    {
+     "mangled_component_name" : "_ZN7android7RefBase13onLastWeakRefEPKv"
+    }
+   ]
+  },
+  {
+   "alignment" : 4,
+   "fields" :
+   [
+    {
+     "access" : "private",
+     "field_name" : "mString",
+     "referenced_type" : "_ZTIPKc"
+    }
+   ],
+   "linker_set_key" : "_ZTIN7android7String8E",
+   "name" : "android::String8",
+   "record_kind" : "class",
+   "referenced_type" : "_ZTIN7android7String8E",
+   "self_type" : "_ZTIN7android7String8E",
+   "size" : 4,
+   "source_file" : "system/core/libutils/include/utils/String8.h"
+  },
+  {
+   "alignment" : 4,
+   "fields" :
+   [
+    {
+     "field_name" : "size",
+     "referenced_type" : "_ZTIKj"
+    },
+    {
+     "field_name" : "data",
+     "field_offset" : 32,
+     "referenced_type" : "_ZTIA1_Ds"
+    }
+   ],
+   "linker_set_key" : "_ZTIN7android8String1610StaticDataILj1EEE",
+   "name" : "android::String16::StaticData<1>",
+   "referenced_type" : "_ZTIN7android8String1610StaticDataILj1EEE",
+   "self_type" : "_ZTIN7android8String1610StaticDataILj1EEE",
+   "size" : 8,
+   "source_file" : "system/core/libutils/include/utils/String16.h"
+  },
+  {
+   "alignment" : 4,
+   "fields" :
+   [
+    {
+     "access" : "private",
+     "field_name" : "mString",
+     "referenced_type" : "_ZTIPKDs"
+    }
+   ],
+   "linker_set_key" : "_ZTIN7android8String16E",
+   "name" : "android::String16",
+   "record_kind" : "class",
+   "referenced_type" : "_ZTIN7android8String16E",
+   "self_type" : "_ZTIN7android8String16E",
+   "size" : 4,
+   "source_file" : "system/core/libutils/include/utils/String16.h"
+  },
+  {
+   "alignment" : 1,
+   "linker_set_key" : "_ZTIN7android9CallStack12StackDeleterE",
+   "name" : "android::CallStack::StackDeleter",
+   "referenced_type" : "_ZTIN7android9CallStack12StackDeleterE",
+   "self_type" : "_ZTIN7android9CallStack12StackDeleterE",
+   "size" : 1,
+   "source_file" : "system/core/libutils/include/utils/CallStack.h"
+  },
+  {
+   "alignment" : 4,
+   "fields" :
+   [
+    {
+     "access" : "private",
+     "field_name" : "mFrameLines",
+     "referenced_type" : "_ZTIN7android6VectorINS_7String8EEE"
+    }
+   ],
+   "linker_set_key" : "_ZTIN7android9CallStackE",
+   "name" : "android::CallStack",
+   "record_kind" : "class",
+   "referenced_type" : "_ZTIN7android9CallStackE",
+   "self_type" : "_ZTIN7android9CallStackE",
+   "size" : 20,
+   "source_file" : "system/core/libutils/include/utils/CallStack.h"
+  },
+  {
+   "alignment" : 4,
+   "fields" :
+   [
+    {
+     "access" : "private",
+     "field_name" : "mCond",
+     "referenced_type" : "_ZTI14pthread_cond_t"
+    }
+   ],
+   "linker_set_key" : "_ZTIN7android9ConditionE",
+   "name" : "android::Condition",
+   "record_kind" : "class",
+   "referenced_type" : "_ZTIN7android9ConditionE",
+   "self_type" : "_ZTIN7android9ConditionE",
+   "size" : 4,
+   "source_file" : "system/core/libutils/include/utils/Condition.h"
+  },
+  {
+   "alignment" : 4,
+   "base_specifiers" :
+   [
+    {
+     "referenced_type" : "_ZTIN7android7PrinterE"
+    }
+   ],
+   "fields" :
+   [
+    {
+     "access" : "private",
+     "field_name" : "mFd",
+     "field_offset" : 32,
+     "referenced_type" : "_ZTIi"
+    },
+    {
+     "access" : "private",
+     "field_name" : "mIndent",
+     "field_offset" : 64,
+     "referenced_type" : "_ZTIj"
+    },
+    {
+     "access" : "private",
+     "field_name" : "mPrefix",
+     "field_offset" : 96,
+     "referenced_type" : "_ZTIPKc"
+    },
+    {
+     "access" : "private",
+     "field_name" : "mFormatString",
+     "field_offset" : 128,
+     "referenced_type" : "_ZTIA20_c"
+    }
+   ],
+   "linker_set_key" : "_ZTIN7android9FdPrinterE",
+   "name" : "android::FdPrinter",
+   "record_kind" : "class",
+   "referenced_type" : "_ZTIN7android9FdPrinterE",
+   "self_type" : "_ZTIN7android9FdPrinterE",
+   "size" : 36,
+   "source_file" : "system/core/libutils/include/utils/Printer.h",
+   "vtable_components" :
+   [
+    {
+     "kind" : "offset_to_top"
+    },
+    {
+     "kind" : "rtti",
+     "mangled_component_name" : "_ZTIN7android9FdPrinterE"
+    },
+    {
+     "mangled_component_name" : "_ZN7android9FdPrinter9printLineEPKc"
+    },
+    {
+     "mangled_component_name" : "_ZN7android7Printer15printFormatLineEPKcz"
+    },
+    {
+     "kind" : "complete_dtor_pointer",
+     "mangled_component_name" : "_ZN7android9FdPrinterD1Ev"
+    },
+    {
+     "kind" : "deleting_dtor_pointer",
+     "mangled_component_name" : "_ZN7android9FdPrinterD0Ev"
+    }
+   ]
+  },
+  {
+   "alignment" : 8,
+   "fields" :
+   [
+    {
+     "access" : "private",
+     "field_name" : "mName",
+     "referenced_type" : "_ZTIPKc"
+    },
+    {
+     "access" : "private",
+     "field_name" : "mClock",
+     "field_offset" : 32,
+     "referenced_type" : "_ZTIi"
+    },
+    {
+     "access" : "private",
+     "field_name" : "mStartTime",
+     "field_offset" : 64,
+     "referenced_type" : "_ZTIx"
+    }
+   ],
+   "linker_set_key" : "_ZTIN7android9StopWatchE",
+   "name" : "android::StopWatch",
+   "record_kind" : "class",
+   "referenced_type" : "_ZTIN7android9StopWatchE",
+   "self_type" : "_ZTIN7android9StopWatchE",
+   "size" : 16,
+   "source_file" : "system/core/libutils/include/utils/StopWatch.h"
+  },
+  {
+   "alignment" : 4,
+   "fields" :
+   [
+    {
+     "access" : "private",
+     "field_name" : "mFilename",
+     "referenced_type" : "_ZTIN7android7String8E"
+    },
+    {
+     "access" : "private",
+     "field_name" : "mFileMap",
+     "field_offset" : 32,
+     "referenced_type" : "_ZTIPN7android7FileMapE"
+    },
+    {
+     "access" : "private",
+     "field_name" : "mBuffer",
+     "field_offset" : 64,
+     "referenced_type" : "_ZTIPc"
+    },
+    {
+     "access" : "private",
+     "field_name" : "mOwnBuffer",
+     "field_offset" : 96,
+     "referenced_type" : "_ZTIb"
+    },
+    {
+     "access" : "private",
+     "field_name" : "mLength",
+     "field_offset" : 128,
+     "referenced_type" : "_ZTIj"
+    },
+    {
+     "access" : "private",
+     "field_name" : "mCurrent",
+     "field_offset" : 160,
+     "referenced_type" : "_ZTIPKc"
+    },
+    {
+     "access" : "private",
+     "field_name" : "mLineNumber",
+     "field_offset" : 192,
+     "referenced_type" : "_ZTIi"
+    }
+   ],
+   "linker_set_key" : "_ZTIN7android9TokenizerE",
+   "name" : "android::Tokenizer",
+   "record_kind" : "class",
+   "referenced_type" : "_ZTIN7android9TokenizerE",
+   "self_type" : "_ZTIN7android9TokenizerE",
+   "size" : 28,
+   "source_file" : "system/core/libutils/include/utils/Tokenizer.h"
+  },
+  {
+   "alignment" : 4,
+   "fields" :
+   [
+    {
+     "field_name" : "buf",
+     "referenced_type" : "_ZTIA5121_h"
+    },
+    {
+     "field_name" : "entry",
+     "referenced_type" : "_ZTI12logger_entry"
+    }
+   ],
+   "is_anonymous" : true,
+   "linker_set_key" : "_ZTIN7log_msgUt_E",
+   "name" : "log_msg::(anonymous)",
+   "record_kind" : "union",
+   "referenced_type" : "_ZTIN7log_msgUt_E",
+   "self_type" : "_ZTIN7log_msgUt_E",
+   "size" : 5124,
+   "source_file" : "system/logging/liblog/include_vndk/log/log_read.h"
+  }
+ ],
+ "rvalue_reference_types" :
+ [
+  {
+   "alignment" : 4,
+   "linker_set_key" : "_ZTION7android2spINS_12NativeHandleEEE",
+   "name" : "android::sp<android::NativeHandle> &&",
+   "referenced_type" : "_ZTIN7android2spINS_12NativeHandleEEE",
+   "self_type" : "_ZTION7android2spINS_12NativeHandleEEE",
+   "size" : 4,
+   "source_file" : "system/core/libutils/include/utils/StrongPointer.h"
+  },
+  {
+   "alignment" : 4,
+   "linker_set_key" : "_ZTION7android2spINS_14MessageHandlerEEE",
+   "name" : "android::sp<android::MessageHandler> &&",
+   "referenced_type" : "_ZTIN7android2spINS_14MessageHandlerEEE",
+   "self_type" : "_ZTION7android2spINS_14MessageHandlerEEE",
+   "size" : 4,
+   "source_file" : "system/core/libutils/include/utils/StrongPointer.h"
+  },
+  {
+   "alignment" : 4,
+   "linker_set_key" : "_ZTION7android2spINS_20SimpleLooperCallbackEEE",
+   "name" : "android::sp<android::SimpleLooperCallback> &&",
+   "referenced_type" : "_ZTIN7android2spINS_20SimpleLooperCallbackEEE",
+   "self_type" : "_ZTION7android2spINS_20SimpleLooperCallbackEEE",
+   "size" : 4,
+   "source_file" : "system/core/libutils/include/utils/StrongPointer.h"
+  },
+  {
+   "alignment" : 4,
+   "linker_set_key" : "_ZTION7android2spINS_6LooperEEE",
+   "name" : "android::sp<android::Looper> &&",
+   "referenced_type" : "_ZTIN7android2spINS_6LooperEEE",
+   "self_type" : "_ZTION7android2spINS_6LooperEEE",
+   "size" : 4,
+   "source_file" : "system/core/libutils/include/utils/StrongPointer.h"
+  },
+  {
+   "alignment" : 4,
+   "linker_set_key" : "_ZTION7android2spINS_6ThreadEEE",
+   "name" : "android::sp<android::Thread> &&",
+   "referenced_type" : "_ZTIN7android2spINS_6ThreadEEE",
+   "self_type" : "_ZTION7android2spINS_6ThreadEEE",
+   "size" : 4,
+   "source_file" : "system/core/libutils/include/utils/StrongPointer.h"
+  },
+  {
+   "alignment" : 4,
+   "linker_set_key" : "_ZTION7android4base14unique_fd_implINS0_13DefaultCloserEEE",
+   "name" : "android::base::unique_fd_impl<android::base::DefaultCloser> &&",
+   "referenced_type" : "_ZTIN7android4base14unique_fd_implINS0_13DefaultCloserEEE",
+   "self_type" : "_ZTION7android4base14unique_fd_implINS0_13DefaultCloserEEE",
+   "size" : 4,
+   "source_file" : "system/libbase/include/android-base/unique_fd.h"
+  },
+  {
+   "alignment" : 4,
+   "linker_set_key" : "_ZTION7android7FileMapE",
+   "name" : "android::FileMap &&",
+   "referenced_type" : "_ZTIN7android7FileMapE",
+   "self_type" : "_ZTION7android7FileMapE",
+   "size" : 4,
+   "source_file" : "system/core/libutils/include/utils/FileMap.h"
+  },
+  {
+   "alignment" : 4,
+   "linker_set_key" : "_ZTION7android8String16E",
+   "name" : "android::String16 &&",
+   "referenced_type" : "_ZTIN7android8String16E",
+   "self_type" : "_ZTION7android8String16E",
+   "size" : 4,
+   "source_file" : "system/core/libutils/include/utils/String16.h"
+  }
+ ]
+}
diff --git a/libutils/include/utils/CallStack.h b/libutils/include/utils/CallStack.h
index 7a4a345..fe4d4f5 100644
--- a/libutils/include/utils/CallStack.h
+++ b/libutils/include/utils/CallStack.h
@@ -20,7 +20,6 @@
 #include <memory>
 
 #include <android/log.h>
-#include <backtrace/backtrace_constants.h>
 #include <utils/String8.h>
 #include <utils/Vector.h>
 
@@ -59,7 +58,7 @@
 
     // Immediately collect the stack traces for the specified thread.
     // The default is to dump the stack of the current call.
-    void update(int32_t ignoreDepth = 1, pid_t tid = BACKTRACE_CURRENT_THREAD);
+    void update(int32_t ignoreDepth = 1, pid_t tid = -1);
 
     // Dump a stack trace to the log using the supplied logtag.
     void log(const char* logtag,
diff --git a/libutils/include/utils/LruCache.h b/libutils/include/utils/LruCache.h
index 36775d0..b4243a3 100644
--- a/libutils/include/utils/LruCache.h
+++ b/libutils/include/utils/LruCache.h
@@ -84,13 +84,13 @@
         const TKey& getKey() const final { return key; }
     };
 
-    struct HashForEntry : public std::unary_function<KeyedEntry*, hash_t> {
+    struct HashForEntry {
         size_t operator() (const KeyedEntry* entry) const {
             return hash_type(entry->getKey());
         };
     };
 
-    struct EqualityForHashedEntries : public std::unary_function<KeyedEntry*, hash_t> {
+    struct EqualityForHashedEntries {
         bool operator() (const KeyedEntry* lhs, const KeyedEntry* rhs) const {
             return lhs->getKey() == rhs->getKey();
         };
diff --git a/libutils/include/utils/RefBase.h b/libutils/include/utils/RefBase.h
index e07f574..5e3fa7d 100644
--- a/libutils/include/utils/RefBase.h
+++ b/libutils/include/utils/RefBase.h
@@ -210,6 +210,7 @@
 
 #include <atomic>
 #include <functional>
+#include <memory>
 #include <type_traits>  // for common_type.
 
 #include <stdint.h>
@@ -779,6 +780,40 @@
 
 }  // namespace android
 
+namespace libutilsinternal {
+template <typename T, typename = void>
+struct is_complete_type : std::false_type {};
+
+template <typename T>
+struct is_complete_type<T, decltype(void(sizeof(T)))> : std::true_type {};
+}  // namespace libutilsinternal
+
+namespace std {
+
+// Define `RefBase` specific versions of `std::make_shared` and
+// `std::make_unique` to block people from using them. Using them to allocate
+// `RefBase` objects results in double ownership. Use
+// `sp<T>::make(...)` instead.
+//
+// Note: We exclude incomplete types because `std::is_base_of` is undefined in
+// that case.
+
+template <typename T, typename... Args,
+          typename std::enable_if<libutilsinternal::is_complete_type<T>::value, bool>::value = true,
+          typename std::enable_if<std::is_base_of<android::RefBase, T>::value, bool>::value = true>
+shared_ptr<T> make_shared(Args...) {  // SEE COMMENT ABOVE.
+    static_assert(!std::is_base_of<android::RefBase, T>::value, "Must use RefBase with sp<>");
+}
+
+template <typename T, typename... Args,
+          typename std::enable_if<libutilsinternal::is_complete_type<T>::value, bool>::value = true,
+          typename std::enable_if<std::is_base_of<android::RefBase, T>::value, bool>::value = true>
+unique_ptr<T> make_unique(Args...) {  // SEE COMMENT ABOVE.
+    static_assert(!std::is_base_of<android::RefBase, T>::value, "Must use RefBase with sp<>");
+}
+
+}  // namespace std
+
 // ---------------------------------------------------------------------------
 
 #endif // ANDROID_REF_BASE_H
diff --git a/libutils/include/utils/StrongPointer.h b/libutils/include/utils/StrongPointer.h
index bb1941b..54aa691 100644
--- a/libutils/include/utils/StrongPointer.h
+++ b/libutils/include/utils/StrongPointer.h
@@ -120,7 +120,6 @@
     template<typename Y> friend class sp;
     template<typename Y> friend class wp;
     void set_pointer(T* ptr);
-    static inline void check_not_on_stack(const void* ptr);
     T* m_ptr;
 };
 
@@ -185,32 +184,10 @@
 
 // For code size reasons, we do not want these inlined or templated.
 void sp_report_race();
-void sp_report_stack_pointer();
 
 // ---------------------------------------------------------------------------
 // No user serviceable parts below here.
 
-// Check whether address is definitely on the calling stack.  We actually check whether it is on
-// the same 4K page as the frame pointer.
-//
-// Assumptions:
-// - Pages are never smaller than 4K (MIN_PAGE_SIZE)
-// - Malloced memory never shares a page with a stack.
-//
-// It does not appear safe to broaden this check to include adjacent pages; apparently this code
-// is used in environments where there may not be a guard page below (at higher addresses than)
-// the bottom of the stack.
-template <typename T>
-void sp<T>::check_not_on_stack(const void* ptr) {
-    static constexpr int MIN_PAGE_SIZE = 0x1000;  // 4K. Safer than including sys/user.h.
-    static constexpr uintptr_t MIN_PAGE_MASK = ~static_cast<uintptr_t>(MIN_PAGE_SIZE - 1);
-    uintptr_t my_frame_address =
-            reinterpret_cast<uintptr_t>(__builtin_frame_address(0 /* this frame */));
-    if (((reinterpret_cast<uintptr_t>(ptr) ^ my_frame_address) & MIN_PAGE_MASK) == 0) {
-        sp_report_stack_pointer();
-    }
-}
-
 // TODO: Ideally we should find a way to increment the reference count before running the
 // constructor, so that generating an sp<> to this in the constructor is no longer dangerous.
 template <typename T>
@@ -219,14 +196,13 @@
     T* t = new T(std::forward<Args>(args)...);
     sp<T> result;
     result.m_ptr = t;
-    t->incStrong(t);  // bypass check_not_on_stack for heap allocation
+    t->incStrong(t);
     return result;
 }
 
 template <typename T>
 sp<T> sp<T>::fromExisting(T* other) {
     if (other) {
-        check_not_on_stack(other);
         other->incStrongRequireStrong(other);
         sp<T> result;
         result.m_ptr = other;
@@ -240,7 +216,6 @@
 sp<T>::sp(T* other)
         : m_ptr(other) {
     if (other) {
-        check_not_on_stack(other);
         other->incStrong(this);
     }
 }
@@ -249,7 +224,6 @@
 template <typename U>
 sp<T>::sp(U* other) : m_ptr(other) {
     if (other) {
-        check_not_on_stack(other);
         (static_cast<T*>(other))->incStrong(this);
     }
 }
@@ -258,7 +232,6 @@
 sp<T>& sp<T>::operator=(T* other) {
     T* oldPtr(*const_cast<T* volatile*>(&m_ptr));
     if (other) {
-        check_not_on_stack(other);
         other->incStrong(this);
     }
     if (oldPtr) oldPtr->decStrong(this);
diff --git a/libutils/include/utils/Thread.h b/libutils/include/utils/Thread.h
index fc67656..5cf6b47 100644
--- a/libutils/include/utils/Thread.h
+++ b/libutils/include/utils/Thread.h
@@ -42,7 +42,9 @@
 {
 public:
     // Create a Thread object, but doesn't create or start the associated
-    // thread. See the run() method.
+    // thread. See the run() method. This object must be used with RefBase/sp,
+    // like any other RefBase object, because they are conventionally promoted
+    // from bare pointers (Thread::run is particularly problematic here).
     explicit            Thread(bool canCallJava = true);
     virtual             ~Thread();
 
diff --git a/libvndksupport/libvndksupport.map.txt b/libvndksupport/libvndksupport.map.txt
index a44ed18..1d94b9d 100644
--- a/libvndksupport/libvndksupport.map.txt
+++ b/libvndksupport/libvndksupport.map.txt
@@ -1,8 +1,8 @@
 LIBVNDKSUPPORT {
   global:
-    android_is_in_vendor_process; # llndk apex
-    android_load_sphal_library; # llndk apex
-    android_unload_sphal_library; # llndk apex
+    android_is_in_vendor_process; # llndk systemapi
+    android_load_sphal_library; # llndk systemapi
+    android_unload_sphal_library; # llndk systemapi
   local:
     *;
 };
diff --git a/mkbootfs/mkbootfs.c b/mkbootfs/mkbootfs.c
index 58153f3..05d1940 100644
--- a/mkbootfs/mkbootfs.c
+++ b/mkbootfs/mkbootfs.c
@@ -24,8 +24,7 @@
 ** - device notes, pipes, etc are not supported (error)
 */
 
-void die(const char *why, ...)
-{
+static void die(const char* why, ...) {
     va_list ap;
 
     va_start(ap, why);
@@ -42,7 +41,7 @@
 };
 
 static struct fs_config_entry* canned_config = NULL;
-static char *target_out_path = NULL;
+static const char* target_out_path = NULL;
 
 /* Each line in the canned file should be a path plus three ints (uid,
  * gid, mode). */
@@ -273,8 +272,7 @@
     }
 }
 
-void archive(const char *start, const char *prefix)
-{
+static void archive(const char* start, const char* prefix) {
     char in[8192];
     char out[8192];
 
@@ -294,7 +292,7 @@
 
     char line[CANNED_LINE_LENGTH];
     FILE* f = fopen(filename, "r");
-    if (f == NULL) die("failed to open canned file");
+    if (f == NULL) die("failed to open canned file '%s'", filename);
 
     while (fgets(line, CANNED_LINE_LENGTH, f) != NULL) {
         if (!line[0]) break;
@@ -332,6 +330,13 @@
 
 int main(int argc, char *argv[])
 {
+    if (argc == 1) {
+        fprintf(stderr,
+                "usage: %s [-d TARGET_OUTPUT_PATH] [-f CANNED_CONFIGURATION_PATH] DIRECTORIES...\n",
+                argv[0]);
+        exit(1);
+    }
+
     argc--;
     argv++;
 
diff --git a/property_service/TEST_MAPPING b/property_service/TEST_MAPPING
index 20f6c84..7b02b51 100644
--- a/property_service/TEST_MAPPING
+++ b/property_service/TEST_MAPPING
@@ -4,7 +4,7 @@
       "name": "propertyinfoserializer_tests"
     }
   ],
-  "hwasan-postsubmit": [
+  "hwasan-presubmit": [
     {
       "name": "propertyinfoserializer_tests"
     }
diff --git a/property_service/libpropertyinfoserializer/property_info_serializer_test.cpp b/property_service/libpropertyinfoserializer/property_info_serializer_test.cpp
index 77cbdd4..a484441 100644
--- a/property_service/libpropertyinfoserializer/property_info_serializer_test.cpp
+++ b/property_service/libpropertyinfoserializer/property_info_serializer_test.cpp
@@ -399,7 +399,6 @@
       {"dalvik.vm.lockprof.threshold", "u:object_r:dalvik_prop:s0"},
       {"dalvik.vm.stack-trace-file", "u:object_r:dalvik_prop:s0"},
       {"dalvik.vm.usejit", "u:object_r:dalvik_prop:s0"},
-      {"dalvik.vm.usejitprofiles", "u:object_r:dalvik_prop:s0"},
       {"debug.atrace.tags.enableflags", "u:object_r:debug_prop:s0"},
       {"debug.force_rtl", "u:object_r:debug_prop:s0"},
       {"dev.bootcomplete", "u:object_r:system_prop:s0"},
diff --git a/rootdir/etc/linker.config.json b/rootdir/etc/linker.config.json
index c88c7ff..47f77b1 100644
--- a/rootdir/etc/linker.config.json
+++ b/rootdir/etc/linker.config.json
@@ -22,8 +22,6 @@
     "libnetd_resolv.so",
     // netd
     "libnetd_updatable.so",
-    // nn
-    "libneuralnetworks.so",
     // statsd
     "libstatspull.so",
     "libstatssocket.so",
@@ -31,6 +29,9 @@
     "libadb_pairing_auth.so",
     "libadb_pairing_connection.so",
     "libadb_pairing_server.so"
+
+    // LLNDK libraries in APEXes will be added automatically from the build,
+    // using build variable LLNDK_MOVED_TO_APEX_LIBRARIES.
   ],
   "provideLibs": [
     "libaptX_encoder.so",
diff --git a/rootdir/etc/public.libraries.wear.txt b/rootdir/etc/public.libraries.wear.txt
index 82196e4..ea1e234 100644
--- a/rootdir/etc/public.libraries.wear.txt
+++ b/rootdir/etc/public.libraries.wear.txt
@@ -10,6 +10,7 @@
 libGLESv1_CM.so
 libGLESv2.so
 libGLESv3.so
+libicu.so
 libicui18n.so
 libicuuc.so
 libjnigraphics.so
diff --git a/rootdir/init.rc b/rootdir/init.rc
index c56f860..323d9cb 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -55,10 +55,11 @@
     # Read more in b/136247322
     write /sys/module/dm_verity/parameters/prefetch_cluster 0
 
-    # Generate ld.config.txt for early executed processes
-    exec -- /system/bin/bootstrap/linkerconfig --target /linkerconfig/bootstrap
+    # Generate empty ld.config.txt for early executed processes which rely on
+    # /system/lib libraries.
+    write /linkerconfig/bootstrap/ld.config.txt \#
+    write /linkerconfig/default/ld.config.txt \#
     chmod 644 /linkerconfig/bootstrap/ld.config.txt
-    copy /linkerconfig/bootstrap/ld.config.txt /linkerconfig/default/ld.config.txt
     chmod 644 /linkerconfig/default/ld.config.txt
 
     # Mount bootstrap linker configuration as current
@@ -86,31 +87,9 @@
     mkdir /dev/sys/fs 0755 system system
     mkdir /dev/sys/block 0755 system system
 
-# Run boringssl self test for each ABI so that later processes can skip it. http://b/139348610
-on early-init && property:ro.product.cpu.abilist32=*
-    exec_start boringssl_self_test32
-on early-init && property:ro.product.cpu.abilist64=*
-    exec_start boringssl_self_test64
-on property:apexd.status=ready && property:ro.product.cpu.abilist32=*
-    exec_start boringssl_self_test_apex32
-on property:apexd.status=ready && property:ro.product.cpu.abilist64=*
-    exec_start boringssl_self_test_apex64
-
-service boringssl_self_test32 /system/bin/boringssl_self_test32
-    reboot_on_failure reboot,boringssl-self-check-failed
-    stdio_to_kmsg
-
-service boringssl_self_test64 /system/bin/boringssl_self_test64
-    reboot_on_failure reboot,boringssl-self-check-failed
-    stdio_to_kmsg
-
-service boringssl_self_test_apex32 /apex/com.android.conscrypt/bin/boringssl_self_test32
-    reboot_on_failure reboot,boringssl-self-check-failed
-    stdio_to_kmsg
-
-service boringssl_self_test_apex64 /apex/com.android.conscrypt/bin/boringssl_self_test64
-    reboot_on_failure reboot,boringssl-self-check-failed
-    stdio_to_kmsg
+    # Create location for fs_mgr to store abbreviated output from filesystem
+    # checker programs.
+    mkdir /dev/fscklogs 0770 root system
 
 on init
     sysclktz 0
@@ -443,10 +422,6 @@
 
     mount bpf bpf /sys/fs/bpf nodev noexec nosuid
 
-    # Create location for fs_mgr to store abbreviated output from filesystem
-    # checker programs.
-    mkdir /dev/fscklogs 0770 root system
-
     # pstore/ramoops previous console log
     mount pstore pstore /sys/fs/pstore nodev noexec nosuid
     chown system log /sys/fs/pstore
@@ -502,6 +477,41 @@
     start hwservicemanager
     start vndservicemanager
 
+# Run boringssl self test for each ABI.  Any failures trigger reboot to firmware.
+on init && property:ro.product.cpu.abilist32=*
+    exec_start boringssl_self_test32
+on init && property:ro.product.cpu.abilist64=*
+    exec_start boringssl_self_test64
+on property:apexd.status=ready && property:ro.product.cpu.abilist32=*
+    exec_start boringssl_self_test_apex32
+on property:apexd.status=ready && property:ro.product.cpu.abilist64=*
+    exec_start boringssl_self_test_apex64
+
+service boringssl_self_test32 /system/bin/boringssl_self_test32
+    reboot_on_failure reboot,boringssl-self-check-failed
+    stdio_to_kmsg
+    # Explicitly specify that boringssl_self_test32 doesn't require any capabilities
+    capabilities
+
+service boringssl_self_test64 /system/bin/boringssl_self_test64
+    reboot_on_failure reboot,boringssl-self-check-failed
+    stdio_to_kmsg
+    # Explicitly specify that boringssl_self_test64 doesn't require any capabilities
+    capabilities
+
+service boringssl_self_test_apex32 /apex/com.android.conscrypt/bin/boringssl_self_test32
+    reboot_on_failure reboot,boringssl-self-check-failed
+    stdio_to_kmsg
+    # Explicitly specify that boringssl_self_test_apex32 doesn't require any capabilities
+    capabilities
+
+service boringssl_self_test_apex64 /apex/com.android.conscrypt/bin/boringssl_self_test64
+    reboot_on_failure reboot,boringssl-self-check-failed
+    stdio_to_kmsg
+    # Explicitly specify that boringssl_self_test_apex64 doesn't require any capabilities
+    capabilities
+
+
 # Healthd can trigger a full boot from charger mode by signaling this
 # property when the power button is held.
 on property:sys.boot_from_charger_mode=1
@@ -684,8 +694,6 @@
     copy /data/system/entropy.dat /dev/urandom
 
     mkdir /data/vendor 0771 root root encryption=Require
-    mkdir /data/vendor_ce 0771 root root encryption=None
-    mkdir /data/vendor_de 0771 root root encryption=None
     mkdir /data/vendor/hardware 0771 root root
 
     # Start tombstoned early to be able to store tombstones.
@@ -738,6 +746,13 @@
     # To handle userspace reboots as well as devices that use FDE, make sure
     # that apexd is started cleanly here (set apexd.status="") and that it is
     # restarted if it's already running.
+    #
+    # /data/apex uses encryption=None because direct I/O support is needed on
+    # APEX files, but some devices don't support direct I/O on encrypted files.
+    # Also, APEXes are public information, similar to the system image.
+    # /data/apex/decompressed and /data/apex/ota_reserved override this setting;
+    # they are encrypted so that files in them can be hard-linked into
+    # /data/rollback which is encrypted.
     mkdir /data/apex 0755 root system encryption=None
     mkdir /data/apex/active 0755 root system
     mkdir /data/apex/backup 0700 root system
@@ -781,12 +796,12 @@
     mkdir /data/misc/carrierid 0770 system radio
     mkdir /data/misc/apns 0770 system radio
     mkdir /data/misc/emergencynumberdb 0770 system radio
-    mkdir /data/misc/zoneinfo 0775 system system
     mkdir /data/misc/network_watchlist 0774 system system
     mkdir /data/misc/textclassifier 0771 system system
     mkdir /data/misc/vpn 0770 system vpn
     mkdir /data/misc/shared_relro 0771 shared_relro shared_relro
     mkdir /data/misc/systemkeys 0700 system system
+    mkdir /data/misc/threadnetwork 0770 thread_network thread_network
     mkdir /data/misc/wifi 0770 wifi wifi
     mkdir /data/misc/wifi/sockets 0770 wifi wifi
     mkdir /data/misc/wifi/wpa_supplicant 0770 wifi wifi
@@ -834,13 +849,14 @@
     exec - virtualizationservice system -- /bin/rm -rf /data/misc/virtualizationservice
     mkdir /data/misc/virtualizationservice 0770 system system
 
+    # /data/preloads uses encryption=None because it only contains preloaded
+    # files that are public information, similar to the system image.
     mkdir /data/preloads 0775 system system encryption=None
 
     # For security reasons, /data/local/tmp should always be empty.
     # Do not place files or directories in /data/local/tmp
     mkdir /data/local/tmp 0771 shell shell
     mkdir /data/local/traces 0777 shell shell
-    mkdir /data/data 0771 system system encryption=None
     mkdir /data/app-private 0771 system system encryption=Require
     mkdir /data/app-ephemeral 0771 system system encryption=Require
     mkdir /data/app-asec 0700 root root encryption=Require
@@ -877,7 +893,10 @@
     chown system system /data/resource-cache
     chmod 0771 /data/resource-cache
 
-    # create the lost+found directories, so as to enforce our permissions
+    # Ensure that lost+found exists and has the correct permissions.  Linux
+    # filesystems expect this directory to exist; it's where the fsck tool puts
+    # any recovered files that weren't present in any directory.  It must be
+    # unencrypted, as fsck must be able to write to it.
     mkdir /data/lost+found 0770 root root encryption=None
 
     # create directory for DRM plug-ins - give drm the read/write access to
@@ -905,36 +924,50 @@
     mkdir /data/system/heapdump 0700 system system
     mkdir /data/system/users 0775 system system
 
-    mkdir /data/system_de 0770 system system encryption=None
-    mkdir /data/system_ce 0770 system system encryption=None
-
-    mkdir /data/misc_de 01771 system misc encryption=None
+    # Create the parent directories of the user CE and DE storage directories.
+    # These parent directories must use encryption=None, since each of their
+    # subdirectories uses a different encryption policy (a per-user one), and
+    # encryption policies apply recursively.  These directories should never
+    # contain any subdirectories other than the per-user ones.  /data/media/obb
+    # is an exception that exists for legacy reasons.
+    mkdir /data/media 0770 media_rw media_rw encryption=None
     mkdir /data/misc_ce 01771 system misc encryption=None
-
+    mkdir /data/misc_de 01771 system misc encryption=None
+    mkdir /data/system_ce 0770 system system encryption=None
+    mkdir /data/system_de 0770 system system encryption=None
     mkdir /data/user 0711 system system encryption=None
     mkdir /data/user_de 0711 system system encryption=None
+    mkdir /data/vendor_ce 0771 root root encryption=None
+    mkdir /data/vendor_de 0771 root root encryption=None
 
-    # Unlink /data/user/0 if we previously symlink it to /data/data
-    rm /data/user/0
+    # Set the casefold flag on /data/media.  For upgrades, a restorecon can be
+    # needed first to relabel the directory from media_rw_data_file.
+    restorecon /data/media
+    exec - media_rw media_rw -- /system/bin/chattr +F /data/media
 
-    # Bind mount /data/user/0 to /data/data
-    mkdir /data/user/0 0700 system system encryption=None
-    mount none /data/data /data/user/0 bind rec
-
-    # A tmpfs directory, which will contain all apps CE DE data directory that
-    # bind mount from the original source.
+    # A tmpfs directory, which will contain all apps and sdk sandbox CE and DE
+    # data directory that bind mount from the original source.
     mount tmpfs tmpfs /data_mirror nodev noexec nosuid mode=0700,uid=0,gid=1000
     restorecon /data_mirror
     mkdir /data_mirror/data_ce 0700 root root
     mkdir /data_mirror/data_de 0700 root root
+    mkdir /data_mirror/misc_ce 0700 root root
+    mkdir /data_mirror/misc_de 0700 root root
 
     # Create CE and DE data directory for default volume
     mkdir /data_mirror/data_ce/null 0700 root root
     mkdir /data_mirror/data_de/null 0700 root root
+    mkdir /data_mirror/misc_ce/null 0700 root root
+    mkdir /data_mirror/misc_de/null 0700 root root
 
-    # Bind mount CE and DE data directory to mirror's default volume directory
+    # Bind mount CE and DE data directory to mirror's default volume directory.
+    # Note that because the /data mount has the "shared" propagation type, the
+    # later bind mount of /data/data onto /data/user/0 will automatically
+    # propagate to /data_mirror/data_ce/null/0 as well.
     mount none /data/user /data_mirror/data_ce/null bind rec
     mount none /data/user_de /data_mirror/data_de/null bind rec
+    mount none /data/misc_ce /data_mirror/misc_ce/null bind rec
+    mount none /data/misc_de /data_mirror/misc_de/null bind rec
 
     # Create mirror directory for jit profiles
     mkdir /data_mirror/cur_profiles 0700 root root
@@ -966,11 +999,6 @@
     wait_for_prop apexd.status activated
     perform_apex_config
 
-    # Special-case /data/media/obb per b/64566063
-    mkdir /data/media 0770 media_rw media_rw encryption=None
-    exec - media_rw media_rw -- /system/bin/chattr +F /data/media
-    mkdir /data/media/obb 0770 media_rw media_rw encryption=Attempt
-
     # Create directories for boot animation.
     mkdir /data/bootanim 0755 system system encryption=DeleteIfNecessary
 
@@ -1009,10 +1037,6 @@
     # completed and apexd.status becomes "ready".
     exec_start apexd-snapshotde
 
-    # Check any timezone data in /data is newer than the copy in the time zone data
-    # module, delete if not.
-    exec - system system -- /system/bin/tzdatacheck /apex/com.android.tzdata/etc/tz /data/misc/zoneinfo
-
     # sys.memfd_use set to false by default, which keeps it disabled
     # until it is confirmed that apps and vendor processes don't make
     # IOCTLs on ashmem fds any more.
@@ -1025,6 +1049,9 @@
     # Enable FUSE by default
     setprop persist.sys.fuse true
 
+    # Update dm-verity state and set partition.*.verified properties.
+    verity_update_state
+
 # It is recommended to put unnecessary data/ initialization from post-fs-data
 # to start-zygote in device's init.rc to unblock zygote start.
 on zygote-start && property:ro.crypto.state=unencrypted
@@ -1096,6 +1123,7 @@
     # are not aware of using fsync()/sync() to prepare sudden power-cut.
     write /dev/sys/fs/by-name/userdata/cp_interval 200
     write /dev/sys/fs/by-name/userdata/gc_urgent_sleep_time 50
+    write /dev/sys/fs/by-name/userdata/iostat_period_ms 1000
     write /dev/sys/fs/by-name/userdata/iostat_enable 1
 
     # set readahead multiplier for POSIX_FADV_SEQUENTIAL files
@@ -1134,10 +1162,6 @@
     chown system system /sys/devices/system/cpu/cpufreq/interactive/io_is_busy
     chmod 0660 /sys/devices/system/cpu/cpufreq/interactive/io_is_busy
 
-    # Assume SMP uses shared cpufreq policy for all CPUs
-    chown system system /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
-    chmod 0660 /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
-
     chown system system /sys/class/leds/vibrator/trigger
     chown system system /sys/class/leds/vibrator/activate
     chown system system /sys/class/leds/vibrator/brightness
@@ -1162,13 +1186,11 @@
     chown system system /sys/kernel/ipv4/tcp_rmem_def
     chown system system /sys/kernel/ipv4/tcp_rmem_max
     chown root radio /proc/cmdline
+    chown root system /proc/bootconfig
 
     # Define default initial receive window size in segments.
     setprop net.tcp_def_init_rwnd 60
 
-    # Update dm-verity state and set partition.*.verified properties.
-    verity_update_state
-
     # Start standard binderized HAL daemons
     class_start hal
 
@@ -1213,7 +1235,7 @@
 # controlling access. On older kernels, the paranoid value is the only means of
 # controlling access. It is normally 3 (allow only root), but the shell user
 # can lower it to 1 (allowing thread-scoped pofiling) via security.perf_harden.
-on property:sys.init.perf_lsm_hooks=1
+on load_bpf_programs && property:sys.init.perf_lsm_hooks=1
     write /proc/sys/kernel/perf_event_paranoid -1
 on property:security.perf_harden=0 && property:sys.init.perf_lsm_hooks=""
     write /proc/sys/kernel/perf_event_paranoid 1
diff --git a/rootdir/init.zygote64.rc b/rootdir/init.zygote64.rc
index 5bde5f4..b6ca5c0 100644
--- a/rootdir/init.zygote64.rc
+++ b/rootdir/init.zygote64.rc
@@ -1,4 +1,4 @@
-service zygote /system/bin/app_process64 -Xzygote /system/bin --zygote --start-system-server
+service zygote /system/bin/app_process64 -Xzygote /system/bin --zygote --start-system-server --socket-name=zygote
     class main
     priority -20
     user root
@@ -13,5 +13,5 @@
     onrestart restart media.tuner
     onrestart restart netd
     onrestart restart wificond
-    task_profiles ProcessCapacityHigh
+    task_profiles ProcessCapacityHigh MaxPerformance
     critical window=${zygote.critical_window.minute:-off} target=zygote-fatal
diff --git a/rootdir/init.zygote64_32.rc b/rootdir/init.zygote64_32.rc
index efb30d6..109bf6c 100644
--- a/rootdir/init.zygote64_32.rc
+++ b/rootdir/init.zygote64_32.rc
@@ -1,20 +1,4 @@
-service zygote /system/bin/app_process64 -Xzygote /system/bin --zygote --start-system-server --socket-name=zygote
-    class main
-    priority -20
-    user root
-    group root readproc reserved_disk
-    socket zygote stream 660 root system
-    socket usap_pool_primary stream 660 root system
-    onrestart exec_background - system system -- /system/bin/vdc volume abort_fuse
-    onrestart write /sys/power/state on
-    onrestart restart audioserver
-    onrestart restart cameraserver
-    onrestart restart media
-    onrestart restart media.tuner
-    onrestart restart netd
-    onrestart restart wificond
-    task_profiles ProcessCapacityHigh MaxPerformance
-    critical window=${zygote.critical_window.minute:-off} target=zygote-fatal
+import /system/etc/init/hw/init.zygote64.rc
 
 service zygote_secondary /system/bin/app_process32 -Xzygote /system/bin --zygote --socket-name=zygote_secondary --enable-lazy-preload
     class main
diff --git a/rootdir/ueventd.rc b/rootdir/ueventd.rc
index 4ec59af..0b7ffb8 100644
--- a/rootdir/ueventd.rc
+++ b/rootdir/ueventd.rc
@@ -69,8 +69,8 @@
 # CDMA radio interface MUX
 /dev/ppp                  0660   radio      vpn
 
-/dev/kvm                  0600   system     system
-/dev/vhost-vsock          0600   system	    system
+/dev/kvm                  0666   root       root
+/dev/vhost-vsock          0666   root       root
 
 # sysfs properties
 /sys/devices/platform/trusty.*      trusty_version        0440  root   log
diff --git a/set-verity-state/.clang-format b/set-verity-state/.clang-format
deleted file mode 120000
index fd0645f..0000000
--- a/set-verity-state/.clang-format
+++ /dev/null
@@ -1 +0,0 @@
-../.clang-format-2
\ No newline at end of file
diff --git a/set-verity-state/Android.bp b/set-verity-state/Android.bp
deleted file mode 100644
index 2f0cb10..0000000
--- a/set-verity-state/Android.bp
+++ /dev/null
@@ -1,29 +0,0 @@
-// Copyright 2019 The Android Open Source Project
-
-package {
-    default_applicable_licenses: ["Android-Apache-2.0"],
-}
-
-cc_binary {
-    name: "set-verity-state",
-    srcs: ["set-verity-state.cpp"],
-    shared_libs: [
-        "libbase",
-        "libcrypto",
-        "libcrypto_utils",
-        "libcutils",
-        "libfec",
-        "libfs_mgr_binder",
-        "liblog",
-        "libutils",
-    ],
-    static_libs: [
-        "libavb_user",
-    ],
-
-    cflags: ["-Werror"],
-    symlinks: [
-        "enable-verity",
-        "disable-verity",
-    ],
-}
diff --git a/set-verity-state/set-verity-state.cpp b/set-verity-state/set-verity-state.cpp
deleted file mode 100644
index 52a7f74..0000000
--- a/set-verity-state/set-verity-state.cpp
+++ /dev/null
@@ -1,255 +0,0 @@
-/*
- * Copyright (C) 2019 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include <errno.h>
-#include <fcntl.h>
-#include <inttypes.h>
-#include <libavb_user/libavb_user.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <sys/mount.h>
-#include <sys/stat.h>
-#include <unistd.h>
-
-#include <android-base/file.h>
-#include <android-base/logging.h>
-#include <android-base/properties.h>
-#include <android-base/stringprintf.h>
-#include <android-base/unique_fd.h>
-#include <fs_mgr.h>
-#include <fs_mgr_overlayfs.h>
-#include <fstab/fstab.h>
-#include <log/log_properties.h>
-
-#include "fec/io.h"
-
-#ifdef ALLOW_DISABLE_VERITY
-static const bool kAllowDisableVerity = true;
-#else
-static const bool kAllowDisableVerity = false;
-#endif
-
-using android::base::unique_fd;
-
-static void suggest_run_adb_root() {
-  if (getuid() != 0) printf("Maybe run adb root?\n");
-}
-
-static bool make_block_device_writable(const std::string& dev) {
-  unique_fd fd(open(dev.c_str(), O_RDONLY | O_CLOEXEC));
-  if (fd == -1) {
-    return false;
-  }
-
-  int OFF = 0;
-  bool result = (ioctl(fd.get(), BLKROSET, &OFF) != -1);
-  return result;
-}
-
-/* Turn verity on/off */
-static bool set_verity_enabled_state(const char* block_device, const char* mount_point,
-                                     bool enable) {
-  if (!make_block_device_writable(block_device)) {
-    printf("Could not make block device %s writable (%s).\n", block_device, strerror(errno));
-    return false;
-  }
-
-  fec::io fh(block_device, O_RDWR);
-
-  if (!fh) {
-    printf("Could not open block device %s (%s).\n", block_device, strerror(errno));
-    suggest_run_adb_root();
-    return false;
-  }
-
-  fec_verity_metadata metadata;
-
-  if (!fh.get_verity_metadata(metadata)) {
-    printf("Couldn't find verity metadata!\n");
-    return false;
-  }
-
-  if (!enable && metadata.disabled) {
-    printf("Verity already disabled on %s\n", mount_point);
-    return false;
-  }
-
-  if (enable && !metadata.disabled) {
-    printf("Verity already enabled on %s\n", mount_point);
-    return false;
-  }
-
-  if (!fh.set_verity_status(enable)) {
-    printf("Could not set verity %s flag on device %s with error %s\n",
-           enable ? "enabled" : "disabled", block_device, strerror(errno));
-    return false;
-  }
-
-  auto change = false;
-  errno = 0;
-  if (enable ? fs_mgr_overlayfs_teardown(mount_point, &change)
-             : fs_mgr_overlayfs_setup(nullptr, mount_point, &change)) {
-    if (change) {
-      printf("%s overlayfs for %s\n", enable ? "disabling" : "using", mount_point);
-    }
-  } else if (errno) {
-    int expected_errno = enable ? EBUSY : ENOENT;
-    if (errno != expected_errno) {
-      printf("Overlayfs %s for %s failed with error %s\n", enable ? "teardown" : "setup",
-             mount_point, strerror(errno));
-    }
-  }
-  printf("Verity %s on %s\n", enable ? "enabled" : "disabled", mount_point);
-  return true;
-}
-
-/* Helper function to get A/B suffix, if any. If the device isn't
- * using A/B the empty string is returned. Otherwise either "_a",
- * "_b", ... is returned.
- */
-static std::string get_ab_suffix() {
-  return android::base::GetProperty("ro.boot.slot_suffix", "");
-}
-
-static bool is_avb_device_locked() {
-  return android::base::GetProperty("ro.boot.vbmeta.device_state", "") == "locked";
-}
-
-static bool overlayfs_setup(bool enable) {
-  auto change = false;
-  errno = 0;
-  if (enable ? fs_mgr_overlayfs_teardown(nullptr, &change)
-             : fs_mgr_overlayfs_setup(nullptr, nullptr, &change)) {
-    if (change) {
-      printf("%s overlayfs\n", enable ? "disabling" : "using");
-    }
-  } else if (errno) {
-    printf("Overlayfs %s failed with error %s\n", enable ? "teardown" : "setup", strerror(errno));
-    suggest_run_adb_root();
-  }
-  return change;
-}
-
-/* Use AVB to turn verity on/off */
-static bool set_avb_verity_enabled_state(AvbOps* ops, bool enable_verity) {
-  std::string ab_suffix = get_ab_suffix();
-  bool verity_enabled;
-
-  if (is_avb_device_locked()) {
-    printf("Device is locked. Please unlock the device first\n");
-    return false;
-  }
-
-  if (!avb_user_verity_get(ops, ab_suffix.c_str(), &verity_enabled)) {
-    printf("Error getting verity state. Try adb root first?\n");
-    return false;
-  }
-
-  if ((verity_enabled && enable_verity) || (!verity_enabled && !enable_verity)) {
-    printf("verity is already %s\n", verity_enabled ? "enabled" : "disabled");
-    return false;
-  }
-
-  if (!avb_user_verity_set(ops, ab_suffix.c_str(), enable_verity)) {
-    printf("Error setting verity\n");
-    return false;
-  }
-
-  overlayfs_setup(enable_verity);
-  printf("Successfully %s verity\n", enable_verity ? "enabled" : "disabled");
-  return true;
-}
-
-int main(int argc, char* argv[]) {
-  if (argc == 0) {
-    LOG(FATAL) << "set-verity-state called with empty argv";
-  }
-
-  std::optional<bool> enable_opt;
-  std::string procname = android::base::Basename(argv[0]);
-  if (procname == "enable-verity") {
-    enable_opt = true;
-  } else if (procname == "disable-verity") {
-    enable_opt = false;
-  }
-
-  if (!enable_opt.has_value()) {
-    if (argc != 2) {
-      printf("usage: %s [1|0]\n", argv[0]);
-      return 1;
-    }
-
-    if (strcmp(argv[1], "1") == 0) {
-      enable_opt = true;
-    } else if (strcmp(argv[1], "0") == 0) {
-      enable_opt = false;
-    } else {
-      printf("usage: %s [1|0]\n", argv[0]);
-      return 1;
-    }
-  }
-
-  bool enable = enable_opt.value();
-
-  bool any_changed = false;
-
-  // Figure out if we're using VB1.0 or VB2.0 (aka AVB) - by
-  // contract, androidboot.vbmeta.digest is set by the bootloader
-  // when using AVB).
-  bool using_avb = !android::base::GetProperty("ro.boot.vbmeta.digest", "").empty();
-
-  // If using AVB, dm-verity is used on any build so we want it to
-  // be possible to disable/enable on any build (except USER). For
-  // VB1.0 dm-verity is only enabled on certain builds.
-  if (!using_avb) {
-    if (!kAllowDisableVerity) {
-      printf("%s only works for userdebug builds\n", argv[0]);
-    }
-
-    if (!android::base::GetBoolProperty("ro.secure", false)) {
-      overlayfs_setup(enable);
-      printf("verity not enabled - ENG build\n");
-      return 0;
-    }
-  }
-
-  // Should never be possible to disable dm-verity on a USER build
-  // regardless of using AVB or VB1.0.
-  if (!__android_log_is_debuggable()) {
-    printf("verity cannot be disabled/enabled - USER build\n");
-    return 0;
-  }
-
-  if (using_avb) {
-    // Yep, the system is using AVB.
-    AvbOps* ops = avb_ops_user_new();
-    if (ops == nullptr) {
-      printf("Error getting AVB ops\n");
-      return 1;
-    }
-    if (set_avb_verity_enabled_state(ops, enable)) {
-      any_changed = true;
-    }
-    avb_ops_user_free(ops);
-  }
-  if (!any_changed) any_changed = overlayfs_setup(enable);
-
-  if (any_changed) {
-    printf("Now reboot your device for settings to take effect\n");
-  }
-
-  return 0;
-}
diff --git a/storaged/storaged.cpp b/storaged/storaged.cpp
index cefef6e..ba79ff7 100644
--- a/storaged/storaged.cpp
+++ b/storaged/storaged.cpp
@@ -27,6 +27,7 @@
 #include <fstream>
 #include <sstream>
 #include <string>
+#include <utility>
 
 #include <aidl/android/hardware/health/BnHealthInfoCallback.h>
 #include <android-base/file.h>
@@ -62,7 +63,7 @@
 
 constexpr ssize_t benchmark_unit_size = 16 * 1024;  // 16KB
 
-constexpr ssize_t min_benchmark_size = 128 * 1024;  // 128KB
+constexpr size_t min_benchmark_size = 128 * 1024;  // 128KB
 
 }  // namespace
 
@@ -244,9 +245,10 @@
     proto.ParseFromString(ss.str());
 
     const UidIOUsage& uid_io_usage = proto.uid_io_usage();
-    uint32_t computed_crc = crc32(current_version,
-        reinterpret_cast<const Bytef*>(uid_io_usage.SerializeAsString().c_str()),
-        uid_io_usage.ByteSize());
+    uint32_t computed_crc =
+            crc32(current_version,
+                  reinterpret_cast<const Bytef*>(uid_io_usage.SerializeAsString().c_str()),
+                  uid_io_usage.ByteSizeLong());
     if (proto.crc() != computed_crc) {
         LOG(WARNING) << "CRC mismatch in " << proto_file;
         return;
@@ -264,31 +266,29 @@
 
     const UidIOUsage& uid_io_usage = proto->uid_io_usage();
     proto->set_crc(crc32(current_version,
-        reinterpret_cast<const Bytef*>(uid_io_usage.SerializeAsString().c_str()),
-        uid_io_usage.ByteSize()));
+                         reinterpret_cast<const Bytef*>(uid_io_usage.SerializeAsString().c_str()),
+                         uid_io_usage.ByteSizeLong()));
 
     uint32_t pagesize = sysconf(_SC_PAGESIZE);
     if (user_id == USER_SYSTEM) {
         proto->set_padding("", 1);
         vector<char> padding;
-        ssize_t size = ROUND_UP(MAX(min_benchmark_size, proto->ByteSize()),
-                                pagesize);
-        padding = vector<char>(size - proto->ByteSize(), 0xFD);
+        ssize_t size = ROUND_UP(std::max(min_benchmark_size, proto->ByteSizeLong()), pagesize);
+        padding = vector<char>(size - proto->ByteSizeLong(), 0xFD);
         proto->set_padding(padding.data(), padding.size());
-        while (!IS_ALIGNED(proto->ByteSize(), pagesize)) {
+        while (!IS_ALIGNED(proto->ByteSizeLong(), pagesize)) {
             padding.push_back(0xFD);
             proto->set_padding(padding.data(), padding.size());
         }
     }
 
     char* data = nullptr;
-    if (posix_memalign(reinterpret_cast<void**>(&data),
-                       pagesize, proto->ByteSize())) {
-        PLOG(ERROR) << "Faied to alloc aligned buffer (size: " << proto->ByteSize() << ")";
+    if (posix_memalign(reinterpret_cast<void**>(&data), pagesize, proto->ByteSizeLong())) {
+        PLOG(ERROR) << "Faied to alloc aligned buffer (size: " << proto->ByteSizeLong() << ")";
         return data;
     }
 
-    proto->SerializeToArray(data, proto->ByteSize());
+    proto->SerializeToArray(data, proto->ByteSizeLong());
     return data;
 }
 
@@ -314,7 +314,7 @@
 
         while (size > 0) {
             start = steady_clock::now();
-            ret = write(fd, data, MIN(benchmark_unit_size, size));
+            ret = write(fd, data, std::min(benchmark_unit_size, size));
             if (ret <= 0) {
                 PLOG(ERROR) << "Faied to write tmp file: " << tmp_file;
                 return;
@@ -352,7 +352,7 @@
     unique_ptr<char> proto_data(prepare_proto(user_id, proto));
     if (proto_data == nullptr) return;
 
-    flush_proto_data(user_id, proto_data.get(), proto->ByteSize());
+    flush_proto_data(user_id, proto_data.get(), proto->ByteSizeLong());
 }
 
 void storaged_t::flush_protos(unordered_map<int, StoragedProto>* protos) {
diff --git a/trusty/OWNERS b/trusty/OWNERS
index 5c4e03a..61b97c6 100644
--- a/trusty/OWNERS
+++ b/trusty/OWNERS
@@ -1,9 +1,11 @@
 armellel@google.com
 arve@android.com
+danielangell@google.com
 gmar@google.com
 marcone@google.com
 mmaurer@google.com
 ncbray@google.com
 swillden@google.com
+thurston@google.com
 trong@google.com
 wenhaowang@google.com
diff --git a/trusty/confirmationui/Android.bp b/trusty/confirmationui/Android.bp
index 0922415..c5c5012 100644
--- a/trusty/confirmationui/Android.bp
+++ b/trusty/confirmationui/Android.bp
@@ -24,21 +24,23 @@
 }
 
 cc_binary {
-    name: "android.hardware.confirmationui@1.0-service.trusty",
+    name: "android.hardware.confirmationui-service.trusty",
     relative_install_path: "hw",
     vendor: true,
     shared_libs: [
-        "android.hardware.confirmationui@1.0",
+        "android.hardware.confirmationui-V1-ndk",
         "android.hardware.confirmationui.not-so-secure-input",
-        "android.hardware.confirmationui@1.0-lib.trusty",
+        "android.hardware.confirmationui-lib.trusty",
+        "libbinder_ndk",
+        "libteeui_hal_support",
         "libbase",
         "libhidlbase",
         "libutils",
     ],
 
-    init_rc: ["android.hardware.confirmationui@1.0-service.trusty.rc"],
+    init_rc: ["android.hardware.confirmationui-service.trusty.rc"],
 
-    vintf_fragments: ["android.hardware.confirmationui@1.0-service.trusty.xml"],
+    vintf_fragments: ["android.hardware.confirmationui-service.trusty.xml"],
 
     srcs: [
         "service.cpp",
@@ -51,18 +53,39 @@
     ],
 }
 
-cc_library {
-    name: "android.hardware.confirmationui@1.0-lib.trusty",
+cc_fuzz {
+    name: "android.hardware.confirmationui-service.trusty_fuzzer",
+    defaults: ["service_fuzzer_defaults"],
     vendor: true,
     shared_libs: [
-        "android.hardware.confirmationui@1.0",
-        "android.hardware.keymaster@4.0",
+        "android.hardware.confirmationui-V1-ndk",
+        "android.hardware.confirmationui.not-so-secure-input",
+        "android.hardware.confirmationui-lib.trusty",
+        "liblog",
+    ],
+    srcs: ["fuzzer.cpp"],
+    fuzz_config: {
+        cc: [
+            "nyamagoud@google.com",
+        ],
+    },
+}
+
+cc_library {
+    name: "android.hardware.confirmationui-lib.trusty",
+    defaults: [
+        "keymint_use_latest_hal_aidl_ndk_shared",
+    ],
+    vendor: true,
+    shared_libs: [
+        "android.hardware.confirmationui-V1-ndk",
         "libbase",
+        "libcutils",
         "libdmabufheap",
-        "libhidlbase",
         "libteeui_hal_support",
         "libtrusty",
         "libutils",
+        "libbinder_ndk",
     ],
 
     export_include_dirs: ["include"],
diff --git a/trusty/confirmationui/TrustyConfirmationUI.cpp b/trusty/confirmationui/TrustyConfirmationUI.cpp
index c6625e0..f01a4e1 100644
--- a/trusty/confirmationui/TrustyConfirmationUI.cpp
+++ b/trusty/confirmationui/TrustyConfirmationUI.cpp
@@ -18,8 +18,6 @@
 #include "TrustyConfirmationUI.h"
 
 #include <android-base/logging.h>
-#include <android/hardware/confirmationui/1.0/types.h>
-#include <android/hardware/keymaster/4.0/types.h>
 #include <fcntl.h>
 #include <linux/input.h>
 #include <poll.h>
@@ -42,12 +40,7 @@
 #include <tuple>
 #include <vector>
 
-namespace android {
-namespace hardware {
-namespace confirmationui {
-namespace V1_0 {
-namespace implementation {
-
+namespace aidl::android::hardware::confirmationui {
 using namespace secure_input;
 
 using ::android::trusty::confirmationui::TrustyAppError;
@@ -64,8 +57,6 @@
 
 using ::secure_input::createSecureInput;
 
-using ::android::hardware::keymaster::V4_0::HardwareAuthToken;
-
 using ::std::tie;
 
 using TeeuiRc = ::teeui::ResponseCode;
@@ -87,46 +78,47 @@
     void release() { f_ = {}; }
 };
 
-ResponseCode convertRc(TeeuiRc trc) {
+int convertRc(TeeuiRc trc) {
     static_assert(
-        uint32_t(TeeuiRc::OK) == uint32_t(ResponseCode::OK) &&
-            uint32_t(TeeuiRc::Canceled) == uint32_t(ResponseCode::Canceled) &&
-            uint32_t(TeeuiRc::Aborted) == uint32_t(ResponseCode::Aborted) &&
-            uint32_t(TeeuiRc::OperationPending) == uint32_t(ResponseCode::OperationPending) &&
-            uint32_t(TeeuiRc::Ignored) == uint32_t(ResponseCode::Ignored) &&
-            uint32_t(TeeuiRc::SystemError) == uint32_t(ResponseCode::SystemError) &&
-            uint32_t(TeeuiRc::Unimplemented) == uint32_t(ResponseCode::Unimplemented) &&
-            uint32_t(TeeuiRc::Unexpected) == uint32_t(ResponseCode::Unexpected) &&
-            uint32_t(TeeuiRc::UIError) == uint32_t(ResponseCode::UIError) &&
-            uint32_t(TeeuiRc::UIErrorMissingGlyph) == uint32_t(ResponseCode::UIErrorMissingGlyph) &&
+        uint32_t(TeeuiRc::OK) == uint32_t(IConfirmationUI::OK) &&
+            uint32_t(TeeuiRc::Canceled) == uint32_t(IConfirmationUI::CANCELED) &&
+            uint32_t(TeeuiRc::Aborted) == uint32_t(IConfirmationUI::ABORTED) &&
+            uint32_t(TeeuiRc::OperationPending) == uint32_t(IConfirmationUI::OPERATION_PENDING) &&
+            uint32_t(TeeuiRc::Ignored) == uint32_t(IConfirmationUI::IGNORED) &&
+            uint32_t(TeeuiRc::SystemError) == uint32_t(IConfirmationUI::SYSTEM_ERROR) &&
+            uint32_t(TeeuiRc::Unimplemented) == uint32_t(IConfirmationUI::UNIMPLEMENTED) &&
+            uint32_t(TeeuiRc::Unexpected) == uint32_t(IConfirmationUI::UNEXPECTED) &&
+            uint32_t(TeeuiRc::UIError) == uint32_t(IConfirmationUI::UI_ERROR) &&
+            uint32_t(TeeuiRc::UIErrorMissingGlyph) ==
+                uint32_t(IConfirmationUI::UI_ERROR_MISSING_GLYPH) &&
             uint32_t(TeeuiRc::UIErrorMessageTooLong) ==
-                uint32_t(ResponseCode::UIErrorMessageTooLong) &&
+                uint32_t(IConfirmationUI::UI_ERROR_MESSAGE_TOO_LONG) &&
             uint32_t(TeeuiRc::UIErrorMalformedUTF8Encoding) ==
-                uint32_t(ResponseCode::UIErrorMalformedUTF8Encoding),
+                uint32_t(IConfirmationUI::UI_ERROR_MALFORMED_UTF8ENCODING),
         "teeui::ResponseCode and "
         "::android::hardware::confirmationui::V1_0::Responsecude are out of "
         "sync");
-    return ResponseCode(trc);
+    return static_cast<int>(trc);
 }
 
 teeui::UIOption convertUIOption(UIOption uio) {
-    static_assert(uint32_t(UIOption::AccessibilityInverted) ==
+    static_assert(uint32_t(UIOption::ACCESSIBILITY_INVERTED) ==
                           uint32_t(teeui::UIOption::AccessibilityInverted) &&
-                      uint32_t(UIOption::AccessibilityMagnified) ==
+                      uint32_t(UIOption::ACCESSIBILITY_MAGNIFIED) ==
                           uint32_t(teeui::UIOption::AccessibilityMagnified),
                   "teeui::UIOPtion and ::android::hardware::confirmationui::V1_0::UIOption "
-                  "anre out of sync");
+                  "are out of sync");
     return teeui::UIOption(uio);
 }
 
-inline MsgString hidl2MsgString(const hidl_string& s) {
+inline MsgString stdString2MsgString(const string& s) {
     return {s.c_str(), s.c_str() + s.size()};
 }
-template <typename T> inline MsgVector<T> hidl2MsgVector(const hidl_vec<T>& v) {
+template <typename T> inline MsgVector<T> stdVector2MsgVector(const vector<T>& v) {
     return {v};
 }
 
-inline MsgVector<teeui::UIOption> hidl2MsgVector(const hidl_vec<UIOption>& v) {
+inline MsgVector<teeui::UIOption> stdVector2MsgVector(const vector<UIOption>& v) {
     MsgVector<teeui::UIOption> result(v.size());
     for (unsigned int i = 0; i < v.size(); ++i) {
         result[i] = convertUIOption(v[i]);
@@ -137,7 +129,7 @@
 }  // namespace
 
 TrustyConfirmationUI::TrustyConfirmationUI()
-    : listener_state_(ListenerState::None), prompt_result_(ResponseCode::Ignored) {}
+    : listener_state_(ListenerState::None), prompt_result_(IConfirmationUI::IGNORED) {}
 
 TrustyConfirmationUI::~TrustyConfirmationUI() {
     ListenerState state = listener_state_;
@@ -385,15 +377,16 @@
     //  ############################## Start 4th Phase - cleanup ##################################
 }
 
-// Methods from ::android::hardware::confirmationui::V1_0::IConfirmationUI
+// Methods from ::aidl::android::hardware::confirmationui::IConfirmationUI
 // follow.
-Return<ResponseCode> TrustyConfirmationUI::promptUserConfirmation(
-    const sp<IConfirmationResultCallback>& resultCB, const hidl_string& promptText,
-    const hidl_vec<uint8_t>& extraData, const hidl_string& locale,
-    const hidl_vec<UIOption>& uiOptions) {
+::ndk::ScopedAStatus TrustyConfirmationUI::promptUserConfirmation(
+    const shared_ptr<IConfirmationResultCallback>& resultCB, const vector<uint8_t>& promptTextBytes,
+    const vector<uint8_t>& extraData, const string& locale, const vector<UIOption>& uiOptions) {
     std::unique_lock<std::mutex> stateLock(listener_state_lock_, std::defer_lock);
+    string promptText(promptTextBytes.begin(), promptTextBytes.end());
     if (!stateLock.try_lock()) {
-        return ResponseCode::OperationPending;
+        return ndk::ScopedAStatus(
+            AStatus_fromServiceSpecificError(IConfirmationUI::OPERATION_PENDING));
     }
     switch (listener_state_) {
     case ListenerState::None:
@@ -401,23 +394,25 @@
     case ListenerState::Starting:
     case ListenerState::SetupDone:
     case ListenerState::Interactive:
-        return ResponseCode::OperationPending;
+        return ndk::ScopedAStatus(
+            AStatus_fromServiceSpecificError(IConfirmationUI::OPERATION_PENDING));
     case ListenerState::Terminating:
         callback_thread_.join();
         listener_state_ = ListenerState::None;
         break;
     default:
-        return ResponseCode::Unexpected;
+        return ndk::ScopedAStatus(AStatus_fromServiceSpecificError(IConfirmationUI::UNEXPECTED));
     }
 
     assert(listener_state_ == ListenerState::None);
 
     callback_thread_ = std::thread(
-        [this](sp<IConfirmationResultCallback> resultCB, hidl_string promptText,
-               hidl_vec<uint8_t> extraData, hidl_string locale, hidl_vec<UIOption> uiOptions) {
-            auto [trc, msg, token] =
-                promptUserConfirmation_(hidl2MsgString(promptText), hidl2MsgVector(extraData),
-                                        hidl2MsgString(locale), hidl2MsgVector(uiOptions));
+        [this](const shared_ptr<IConfirmationResultCallback>& resultCB, const string& promptText,
+               const vector<uint8_t>& extraData, const string& locale,
+               const vector<UIOption>& uiOptions) {
+            auto [trc, msg, token] = promptUserConfirmation_(
+                stdString2MsgString(promptText), stdVector2MsgVector(extraData),
+                stdString2MsgString(locale), stdVector2MsgVector(uiOptions));
             bool do_callback = (listener_state_ == ListenerState::Interactive ||
                                 listener_state_ == ListenerState::SetupDone) &&
                                resultCB;
@@ -426,7 +421,7 @@
             if (do_callback) {
                 auto error = resultCB->result(prompt_result_, msg, token);
                 if (!error.isOk()) {
-                    LOG(ERROR) << "Result callback failed " << error.description();
+                    LOG(ERROR) << "Result callback failed " << error.getDescription();
                 }
             } else {
                 listener_state_condv_.notify_all();
@@ -442,14 +437,14 @@
     if (listener_state_ == ListenerState::Terminating) {
         callback_thread_.join();
         listener_state_ = ListenerState::None;
-        return prompt_result_;
+        return ndk::ScopedAStatus(AStatus_fromServiceSpecificError(prompt_result_));
     }
-    return ResponseCode::OK;
+    return ndk::ScopedAStatus::ok();
 }
 
-Return<ResponseCode>
+::ndk::ScopedAStatus
 TrustyConfirmationUI::deliverSecureInputEvent(const HardwareAuthToken& secureInputToken) {
-    ResponseCode rc = ResponseCode::Ignored;
+    int rc = IConfirmationUI::IGNORED;
     {
         /*
          * deliverSecureInputEvent is only used by the VTS test to mock human input. A correct
@@ -467,13 +462,17 @@
         listener_state_condv_.wait(stateLock,
                                    [this] { return listener_state_ != ListenerState::SetupDone; });
 
-        if (listener_state_ != ListenerState::Interactive) return ResponseCode::Ignored;
+        if (listener_state_ != ListenerState::Interactive)
+            return ndk::ScopedAStatus(AStatus_fromServiceSpecificError(IConfirmationUI::IGNORED));
         auto sapp = app_.lock();
-        if (!sapp) return ResponseCode::Ignored;
+        if (!sapp)
+            return ndk::ScopedAStatus(AStatus_fromServiceSpecificError(IConfirmationUI::IGNORED));
         auto [error, response] =
             sapp->issueCmd<DeliverTestCommandMessage, DeliverTestCommandResponse>(
                 static_cast<teeui::TestModeCommands>(secureInputToken.challenge));
-        if (error != TrustyAppError::OK) return ResponseCode::SystemError;
+        if (error != TrustyAppError::OK)
+            return ndk::ScopedAStatus(
+                AStatus_fromServiceSpecificError(IConfirmationUI::SYSTEM_ERROR));
         auto& [trc] = response;
         if (trc != TeeuiRc::Ignored) secureInputDelivered_ = true;
         rc = convertRc(trc);
@@ -484,11 +483,14 @@
     // Canceled into OK. Canceled is only returned if the delivered event canceled
     // the operation, which means that the event was successfully delivered. Thus
     // we return OK.
-    if (rc == ResponseCode::Canceled) return ResponseCode::OK;
-    return rc;
+    if (rc == IConfirmationUI::CANCELED) return ndk::ScopedAStatus::ok();
+    if (rc != IConfirmationUI::OK) {
+        return ndk::ScopedAStatus(AStatus_fromServiceSpecificError(rc));
+    }
+    return ndk::ScopedAStatus::ok();
 }
 
-Return<void> TrustyConfirmationUI::abort() {
+::ndk::ScopedAStatus TrustyConfirmationUI::abort() {
     {
         std::unique_lock<std::mutex> stateLock(listener_state_lock_);
         if (listener_state_ == ListenerState::SetupDone ||
@@ -499,15 +501,11 @@
         }
     }
     listener_state_condv_.notify_all();
-    return Void();
+    return ndk::ScopedAStatus::ok();
 }
 
-android::sp<IConfirmationUI> createTrustyConfirmationUI() {
-    return new TrustyConfirmationUI();
+std::shared_ptr<IConfirmationUI> createTrustyConfirmationUI() {
+    return ndk::SharedRefBase::make<TrustyConfirmationUI>();
 }
 
-}  // namespace implementation
-}  // namespace V1_0
-}  // namespace confirmationui
-}  // namespace hardware
-}  // namespace android
+}  // namespace aidl::android::hardware::confirmationui
diff --git a/trusty/confirmationui/TrustyConfirmationUI.h b/trusty/confirmationui/TrustyConfirmationUI.h
index 0bd703c..6e85704 100644
--- a/trusty/confirmationui/TrustyConfirmationUI.h
+++ b/trusty/confirmationui/TrustyConfirmationUI.h
@@ -17,9 +17,11 @@
 #ifndef ANDROID_HARDWARE_CONFIRMATIONUI_V1_0_TRUSTY_CONFIRMATIONUI_H
 #define ANDROID_HARDWARE_CONFIRMATIONUI_V1_0_TRUSTY_CONFIRMATIONUI_H
 
-#include <android/hardware/confirmationui/1.0/IConfirmationUI.h>
-#include <android/hardware/keymaster/4.0/types.h>
-#include <hidl/Status.h>
+#include <aidl/android/hardware/confirmationui/BnConfirmationUI.h>
+#include <aidl/android/hardware/confirmationui/IConfirmationResultCallback.h>
+#include <aidl/android/hardware/confirmationui/UIOption.h>
+#include <aidl/android/hardware/security/keymint/HardwareAuthToken.h>
+#include <android/binder_manager.h>
 
 #include <atomic>
 #include <condition_variable>
@@ -30,35 +32,29 @@
 
 #include "TrustyApp.h"
 
-namespace android {
-namespace hardware {
-namespace confirmationui {
-namespace V1_0 {
-namespace implementation {
+namespace aidl::android::hardware::confirmationui {
 
-using ::android::sp;
-using ::android::hardware::hidl_array;
-using ::android::hardware::hidl_string;
-using ::android::hardware::hidl_vec;
-using ::android::hardware::Return;
-using ::android::hardware::Void;
+using std::shared_ptr;
+using std::string;
+using std::vector;
 
+using ::aidl::android::hardware::security::keymint::HardwareAuthToken;
 using ::android::trusty::confirmationui::TrustyApp;
 
-class TrustyConfirmationUI : public IConfirmationUI {
+class TrustyConfirmationUI : public BnConfirmationUI {
   public:
     TrustyConfirmationUI();
     virtual ~TrustyConfirmationUI();
-    // Methods from ::android::hardware::confirmationui::V1_0::IConfirmationUI
+    // Methods from ::aidl::android::hardware::confirmationui::IConfirmationUI
     // follow.
-    Return<ResponseCode> promptUserConfirmation(const sp<IConfirmationResultCallback>& resultCB,
-                                                const hidl_string& promptText,
-                                                const hidl_vec<uint8_t>& extraData,
-                                                const hidl_string& locale,
-                                                const hidl_vec<UIOption>& uiOptions) override;
-    Return<ResponseCode> deliverSecureInputEvent(
-        const ::android::hardware::keymaster::V4_0::HardwareAuthToken& secureInputToken) override;
-    Return<void> abort() override;
+    ::ndk::ScopedAStatus
+    promptUserConfirmation(const shared_ptr<IConfirmationResultCallback>& resultCB,
+                           const vector<uint8_t>& promptText, const vector<uint8_t>& extraData,
+                           const string& locale, const vector<UIOption>& uiOptions) override;
+    ::ndk::ScopedAStatus
+    deliverSecureInputEvent(const HardwareAuthToken& secureInputToken) override;
+
+    ::ndk::ScopedAStatus abort() override;
 
   private:
     std::weak_ptr<TrustyApp> app_;
@@ -85,7 +81,7 @@
     bool abort_called_;
     std::mutex listener_state_lock_;
     std::condition_variable listener_state_condv_;
-    ResponseCode prompt_result_;
+    int prompt_result_;
     bool secureInputDelivered_;
 
     std::tuple<teeui::ResponseCode, teeui::MsgVector<uint8_t>, teeui::MsgVector<uint8_t>>
@@ -95,10 +91,6 @@
                             const teeui::MsgVector<teeui::UIOption>& uiOptions);
 };
 
-}  // namespace implementation
-}  // namespace V1_0
-}  // namespace confirmationui
-}  // namespace hardware
-}  // namespace android
+}  // namespace aidl::android::hardware::confirmationui
 
 #endif  // ANDROID_HARDWARE_CONFIRMATIONUI_V1_0_TRUSTY_CONFIRMATIONUI_H
diff --git a/trusty/confirmationui/android.hardware.confirmationui-service.trusty.rc b/trusty/confirmationui/android.hardware.confirmationui-service.trusty.rc
new file mode 100644
index 0000000..b5c3159
--- /dev/null
+++ b/trusty/confirmationui/android.hardware.confirmationui-service.trusty.rc
@@ -0,0 +1,5 @@
+service vendor.confirmationui_default /vendor/bin/hw/android.hardware.confirmationui-service.trusty
+    interface aidl android.hardware.confirmationui.IConfirmationUI/default
+    class hal
+    user system
+    group drmrpc input system
diff --git a/trusty/confirmationui/android.hardware.confirmationui@1.0-service.trusty.xml b/trusty/confirmationui/android.hardware.confirmationui-service.trusty.xml
similarity index 71%
rename from trusty/confirmationui/android.hardware.confirmationui@1.0-service.trusty.xml
rename to trusty/confirmationui/android.hardware.confirmationui-service.trusty.xml
index 9008b87..afa2e8e 100644
--- a/trusty/confirmationui/android.hardware.confirmationui@1.0-service.trusty.xml
+++ b/trusty/confirmationui/android.hardware.confirmationui-service.trusty.xml
@@ -1,8 +1,7 @@
 <manifest version="1.0" type="device">
-    <hal format="hidl">
+    <hal format="aidl">
         <name>android.hardware.confirmationui</name>
-        <transport>hwbinder</transport>
-        <version>1.0</version>
+        <version>1</version>
         <interface>
         <name>IConfirmationUI</name>
             <instance>default</instance>
diff --git a/trusty/confirmationui/android.hardware.confirmationui@1.0-service.trusty.rc b/trusty/confirmationui/android.hardware.confirmationui@1.0-service.trusty.rc
deleted file mode 100644
index 3ba6fc0..0000000
--- a/trusty/confirmationui/android.hardware.confirmationui@1.0-service.trusty.rc
+++ /dev/null
@@ -1,4 +0,0 @@
-service confirmationui-1-0 /vendor/bin/hw/android.hardware.confirmationui@1.0-service.trusty
-    class hal
-    user system
-    group drmrpc input system
diff --git a/trusty/confirmationui/fuzzer.cpp b/trusty/confirmationui/fuzzer.cpp
new file mode 100644
index 0000000..4446b79
--- /dev/null
+++ b/trusty/confirmationui/fuzzer.cpp
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <TrustyConfirmationuiHal.h>
+#include <android-base/logging.h>
+#include <fuzzbinder/libbinder_ndk_driver.h>
+#include <fuzzer/FuzzedDataProvider.h>
+
+using aidl::android::hardware::confirmationui::createTrustyConfirmationUI;
+using aidl::android::hardware::confirmationui::IConfirmationUI;
+using android::fuzzService;
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+    auto confirmationui = createTrustyConfirmationUI();
+
+    fuzzService(confirmationui->asBinder().get(), FuzzedDataProvider(data, size));
+
+    return 0;
+}
diff --git a/trusty/confirmationui/include/TrustyConfirmationuiHal.h b/trusty/confirmationui/include/TrustyConfirmationuiHal.h
index 2ab9389..8000ee2 100644
--- a/trusty/confirmationui/include/TrustyConfirmationuiHal.h
+++ b/trusty/confirmationui/include/TrustyConfirmationuiHal.h
@@ -16,18 +16,10 @@
 
 #pragma once
 
-#include <android/hardware/confirmationui/1.0/IConfirmationUI.h>
+#include <aidl/android/hardware/confirmationui/IConfirmationUI.h>
 
-namespace android {
-namespace hardware {
-namespace confirmationui {
-namespace V1_0 {
-namespace implementation {
+namespace aidl::android::hardware::confirmationui {
 
-android::sp<IConfirmationUI> createTrustyConfirmationUI();
+std::shared_ptr<IConfirmationUI> createTrustyConfirmationUI();
 
-}  // namespace implementation
-}  // namespace V1_0
-}  // namespace confirmationui
-}  // namespace hardware
-}  // namespace android
+}  // namespace aidl::android::hardware::confirmationui
diff --git a/trusty/confirmationui/service.cpp b/trusty/confirmationui/service.cpp
index dd7e84b..44fa3a6 100644
--- a/trusty/confirmationui/service.cpp
+++ b/trusty/confirmationui/service.cpp
@@ -15,21 +15,24 @@
  */
 
 #include <android-base/logging.h>
-#include <hidl/HidlTransportSupport.h>
+#include <android/binder_manager.h>
+#include <android/binder_process.h>
 
 #include <TrustyConfirmationuiHal.h>
 
-using android::sp;
-using android::hardware::confirmationui::V1_0::implementation::createTrustyConfirmationUI;
+using ::aidl::android::hardware::confirmationui::createTrustyConfirmationUI;
+using ::aidl::android::hardware::confirmationui::IConfirmationUI;
 
 int main() {
-    ::android::hardware::configureRpcThreadpool(1, true /*willJoinThreadpool*/);
-    auto service = createTrustyConfirmationUI();
-    auto status = service->registerAsService();
-    if (status != android::OK) {
-        LOG(FATAL) << "Could not register service for ConfirmationUI 1.0 (" << status << ")";
-        return -1;
-    }
-    ::android::hardware::joinRpcThreadpool();
-    return -1;
+    ABinderProcess_setThreadPoolMaxThreadCount(0);
+
+    auto confirmationui = createTrustyConfirmationUI();
+
+    const auto instance = std::string(IConfirmationUI::descriptor) + "/default";
+    binder_status_t status =
+        AServiceManager_addService(confirmationui->asBinder().get(), instance.c_str());
+    CHECK_EQ(status, STATUS_OK) << "Could not register " << instance;
+
+    ABinderProcess_joinThreadPool();
+    return EXIT_FAILURE;
 }
diff --git a/trusty/gatekeeper/TEST_MAPPING b/trusty/gatekeeper/TEST_MAPPING
new file mode 100644
index 0000000..da6c769
--- /dev/null
+++ b/trusty/gatekeeper/TEST_MAPPING
@@ -0,0 +1,7 @@
+{
+  "presubmit": [
+      {
+        "name": "VtsHalGatekeeperTargetTest"
+      }
+  ]
+}
diff --git a/trusty/keymaster/Android.bp b/trusty/keymaster/Android.bp
index 0e916ef..31f0a72 100644
--- a/trusty/keymaster/Android.bp
+++ b/trusty/keymaster/Android.bp
@@ -109,6 +109,7 @@
         "keymint_use_latest_hal_aidl_ndk_shared",
     ],
     shared_libs: [
+        "android.hardware.security.rkp-V3-ndk",
         "android.hardware.security.secureclock-V1-ndk",
         "android.hardware.security.sharedsecret-V1-ndk",
         "lib_android_keymaster_keymint_utils",
@@ -123,7 +124,6 @@
     ],
     required: [
         "android.hardware.hardware_keystore.xml",
-        "RemoteProvisioner",
     ],
 }
 
diff --git a/trusty/keymaster/TEST_MAPPING b/trusty/keymaster/TEST_MAPPING
new file mode 100644
index 0000000..ae48327
--- /dev/null
+++ b/trusty/keymaster/TEST_MAPPING
@@ -0,0 +1,13 @@
+{
+  "presubmit": [
+      {
+        "name": "RemoteProvisionerUnitTests"
+      },
+      {
+        "name": "VtsAidlKeyMintTargetTest"
+      },
+      {
+        "name": "VtsHalRemotelyProvisionedComponentTargetTest"
+      }
+  ]
+}
diff --git a/trusty/keymaster/TrustyKeymaster.cpp b/trusty/keymaster/TrustyKeymaster.cpp
index e77940a..ac98695 100644
--- a/trusty/keymaster/TrustyKeymaster.cpp
+++ b/trusty/keymaster/TrustyKeymaster.cpp
@@ -178,6 +178,11 @@
     ForwardCommand(KM_GENERATE_CSR, request, response);
 }
 
+void TrustyKeymaster::GenerateCsrV2(const GenerateCsrV2Request& request,
+                                    GenerateCsrV2Response* response) {
+    ForwardCommand(KM_GENERATE_CSR_V2, request, response);
+}
+
 void TrustyKeymaster::GetKeyCharacteristics(const GetKeyCharacteristicsRequest& request,
                                             GetKeyCharacteristicsResponse* response) {
     ForwardCommand(KM_GET_KEY_CHARACTERISTICS, request, response);
@@ -285,4 +290,10 @@
     return response;
 }
 
+GetHwInfoResponse TrustyKeymaster::GetHwInfo() {
+    GetHwInfoResponse response(message_version());
+    ForwardCommand(KM_GET_HW_INFO, GetHwInfoRequest(message_version()), &response);
+    return response;
+}
+
 }  // namespace keymaster
diff --git a/trusty/keymaster/include/trusty_keymaster/TrustyKeymaster.h b/trusty/keymaster/include/trusty_keymaster/TrustyKeymaster.h
index 9f4f39b..60d3f87 100644
--- a/trusty/keymaster/include/trusty_keymaster/TrustyKeymaster.h
+++ b/trusty/keymaster/include/trusty_keymaster/TrustyKeymaster.h
@@ -44,6 +44,7 @@
     void GenerateKey(const GenerateKeyRequest& request, GenerateKeyResponse* response);
     void GenerateRkpKey(const GenerateRkpKeyRequest& request, GenerateRkpKeyResponse* response);
     void GenerateCsr(const GenerateCsrRequest& request, GenerateCsrResponse* response);
+    void GenerateCsrV2(const GenerateCsrV2Request& request, GenerateCsrV2Response* response);
     void GetKeyCharacteristics(const GetKeyCharacteristicsRequest& request,
                                GetKeyCharacteristicsResponse* response);
     void ImportKey(const ImportKeyRequest& request, ImportKeyResponse* response);
@@ -67,6 +68,7 @@
     ConfigureVendorPatchlevelResponse ConfigureVendorPatchlevel(
             const ConfigureVendorPatchlevelRequest& request);
     GetRootOfTrustResponse GetRootOfTrust(const GetRootOfTrustRequest& request);
+    GetHwInfoResponse GetHwInfo();
 
     uint32_t message_version() const { return message_version_; }
 
diff --git a/trusty/keymaster/include/trusty_keymaster/TrustyRemotelyProvisionedComponentDevice.h b/trusty/keymaster/include/trusty_keymaster/TrustyRemotelyProvisionedComponentDevice.h
index d544b51..dbb7fff 100644
--- a/trusty/keymaster/include/trusty_keymaster/TrustyRemotelyProvisionedComponentDevice.h
+++ b/trusty/keymaster/include/trusty_keymaster/TrustyRemotelyProvisionedComponentDevice.h
@@ -46,6 +46,10 @@
                                              DeviceInfo* deviceInfo, ProtectedData* protectedData,
                                              std::vector<uint8_t>* keysToSignMac) override;
 
+    ScopedAStatus generateCertificateRequestV2(const std::vector<MacedPublicKey>& keysToSign,
+                                               const std::vector<uint8_t>& challenge,
+                                               std::vector<uint8_t>* csr) override;
+
   private:
     std::shared_ptr<::keymaster::TrustyKeymaster> impl_;
 };
diff --git a/trusty/keymaster/include/trusty_keymaster/ipc/keymaster_ipc.h b/trusty/keymaster/include/trusty_keymaster/ipc/keymaster_ipc.h
index bf0cb70..f767d40 100644
--- a/trusty/keymaster/include/trusty_keymaster/ipc/keymaster_ipc.h
+++ b/trusty/keymaster/include/trusty_keymaster/ipc/keymaster_ipc.h
@@ -60,6 +60,8 @@
     KM_GENERATE_CSR                 = (32 << KEYMASTER_REQ_SHIFT),
     KM_CONFIGURE_VENDOR_PATCHLEVEL  = (33 << KEYMASTER_REQ_SHIFT),
     KM_GET_ROOT_OF_TRUST            = (34 << KEYMASTER_REQ_SHIFT),
+    KM_GET_HW_INFO                  = (35 << KEYMASTER_REQ_SHIFT),
+    KM_GENERATE_CSR_V2              = (36 << KEYMASTER_REQ_SHIFT),
 
     // Bootloader/provisioning calls.
     KM_SET_BOOT_PARAMS = (0x1000 << KEYMASTER_REQ_SHIFT),
diff --git a/trusty/keymaster/keymint/TEST_MAPPING b/trusty/keymaster/keymint/TEST_MAPPING
index ae24fb4..6671355 100644
--- a/trusty/keymaster/keymint/TEST_MAPPING
+++ b/trusty/keymaster/keymint/TEST_MAPPING
@@ -4,7 +4,7 @@
       "name" : "vts_treble_vintf_framework_test"
     }
   ],
-  "hwasan-postsubmit" : [
+  "hwasan-presubmit" : [
     {
       "name" : "vts_treble_vintf_framework_test"
     }
diff --git a/trusty/keymaster/keymint/TrustyKeyMintDevice.cpp b/trusty/keymaster/keymint/TrustyKeyMintDevice.cpp
index 7d58162..b696ff9 100644
--- a/trusty/keymaster/keymint/TrustyKeyMintDevice.cpp
+++ b/trusty/keymaster/keymint/TrustyKeyMintDevice.cpp
@@ -91,7 +91,7 @@
 }  // namespace
 
 ScopedAStatus TrustyKeyMintDevice::getHardwareInfo(KeyMintHardwareInfo* info) {
-    info->versionNumber = 2;
+    info->versionNumber = 3;
     info->securityLevel = kSecurityLevel;
     info->keyMintName = "TrustyKeyMintDevice";
     info->keyMintAuthorName = "Google";
diff --git a/trusty/keymaster/keymint/TrustyRemotelyProvisionedComponentDevice.cpp b/trusty/keymaster/keymint/TrustyRemotelyProvisionedComponentDevice.cpp
index 099f189..710be3e 100644
--- a/trusty/keymaster/keymint/TrustyRemotelyProvisionedComponentDevice.cpp
+++ b/trusty/keymaster/keymint/TrustyRemotelyProvisionedComponentDevice.cpp
@@ -28,9 +28,14 @@
 
 using keymaster::GenerateCsrRequest;
 using keymaster::GenerateCsrResponse;
+using keymaster::GenerateCsrV2Request;
+using keymaster::GenerateCsrV2Response;
 using keymaster::GenerateRkpKeyRequest;
 using keymaster::GenerateRkpKeyResponse;
+using keymaster::GetHwInfoRequest;
+using keymaster::GetHwInfoResponse;
 using keymaster::KeymasterBlob;
+using km_utils::kmError2ScopedAStatus;
 using ::std::string;
 using ::std::unique_ptr;
 using ::std::vector;
@@ -71,10 +76,16 @@
 }  // namespace
 
 ScopedAStatus TrustyRemotelyProvisionedComponentDevice::getHardwareInfo(RpcHardwareInfo* info) {
-    info->versionNumber = 2;
-    info->rpcAuthorName = "Google";
-    info->supportedEekCurve = RpcHardwareInfo::CURVE_25519;
-    info->uniqueId = "Trusty: My password is ******";
+    GetHwInfoResponse response = impl_->GetHwInfo();
+    if (response.error != KM_ERROR_OK) {
+        return Status(-static_cast<int32_t>(response.error), "Failed to get hardware info.");
+    }
+
+    info->versionNumber = response.version;
+    info->rpcAuthorName = std::move(response.rpcAuthorName);
+    info->supportedEekCurve = response.supportedEekCurve;
+    info->uniqueId = std::move(response.uniqueId);
+    info->supportedNumKeysInCsr = response.supportedNumKeysInCsr;
     return ScopedAStatus::ok();
 }
 
@@ -118,4 +129,25 @@
     return ScopedAStatus::ok();
 }
 
+ScopedAStatus TrustyRemotelyProvisionedComponentDevice::generateCertificateRequestV2(
+        const std::vector<MacedPublicKey>& keysToSign, const std::vector<uint8_t>& challenge,
+        std::vector<uint8_t>* csr) {
+    GenerateCsrV2Request request(impl_->message_version());
+    if (!request.InitKeysToSign(keysToSign.size())) {
+        return kmError2ScopedAStatus(static_cast<keymaster_error_t>(STATUS_FAILED));
+    }
+    for (size_t i = 0; i < keysToSign.size(); i++) {
+        request.SetKeyToSign(i, keysToSign[i].macedKey.data(), keysToSign[i].macedKey.size());
+    }
+    request.SetChallenge(challenge.data(), challenge.size());
+    GenerateCsrV2Response response(impl_->message_version());
+    impl_->GenerateCsrV2(request, &response);
+
+    if (response.error != KM_ERROR_OK) {
+        return Status(-static_cast<int32_t>(response.error), "Failure in CSR v2 generation.");
+    }
+    *csr = km_utils::kmBlob2vector(response.csr);
+    return ScopedAStatus::ok();
+}
+
 }  // namespace aidl::android::hardware::security::keymint::trusty
diff --git a/trusty/keymaster/keymint/android.hardware.security.keymint-service.trusty.xml b/trusty/keymaster/keymint/android.hardware.security.keymint-service.trusty.xml
index 0b995a2..3dc9c88 100644
--- a/trusty/keymaster/keymint/android.hardware.security.keymint-service.trusty.xml
+++ b/trusty/keymaster/keymint/android.hardware.security.keymint-service.trusty.xml
@@ -1,7 +1,7 @@
 <manifest version="1.0" type="device">
     <hal format="aidl">
         <name>android.hardware.security.keymint</name>
-        <version>2</version>
+        <version>3</version>
         <fqname>IKeyMintDevice/default</fqname>
     </hal>
     <hal format="aidl">
@@ -14,7 +14,7 @@
     </hal>
     <hal format="aidl">
         <name>android.hardware.security.keymint</name>
-        <version>2</version>
+        <version>3</version>
         <fqname>IRemotelyProvisionedComponent/default</fqname>
     </hal>
 </manifest>
diff --git a/trusty/keymaster/keymint/service.cpp b/trusty/keymaster/keymint/service.cpp
index 3447b27..14549d2 100644
--- a/trusty/keymaster/keymint/service.cpp
+++ b/trusty/keymaster/keymint/service.cpp
@@ -41,7 +41,7 @@
 
 int main() {
     auto trustyKeymaster = std::make_shared<keymaster::TrustyKeymaster>();
-    int err = trustyKeymaster->Initialize(keymaster::KmVersion::KEYMINT_2);
+    int err = trustyKeymaster->Initialize(keymaster::KmVersion::KEYMINT_3);
     if (err != 0) {
         LOG(FATAL) << "Could not initialize TrustyKeymaster for KeyMint (" << err << ")";
         return -1;
diff --git a/trusty/keymint/Android.bp b/trusty/keymint/Android.bp
new file mode 100644
index 0000000..c19ebbd
--- /dev/null
+++ b/trusty/keymint/Android.bp
@@ -0,0 +1,41 @@
+//
+// Copyright (C) 2022 The Android Open-Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+rust_binary {
+    name: "android.hardware.security.keymint-service.rust.trusty",
+    relative_install_path: "hw",
+    vendor: true,
+    init_rc: ["android.hardware.security.keymint-service.rust.trusty.rc"],
+    vintf_fragments: ["android.hardware.security.keymint-service.rust.trusty.xml"],
+    srcs: [
+        "src/keymint_hal_main.rs"
+    ],
+    rustlibs: [
+        "libandroid_logger",
+        "libbinder_rs",
+        "libkmr_wire",
+        "libkmr_hal",
+        "libtrusty-rs",
+        "liblibc",
+        "liblog_rust",
+    ],
+    required: [
+        "android.hardware.hardware_keystore.xml",
+    ],
+}
diff --git a/trusty/keymint/android.hardware.hardware_keystore.rust.trusty-keymint.xml b/trusty/keymint/android.hardware.hardware_keystore.rust.trusty-keymint.xml
new file mode 100644
index 0000000..cd656b2
--- /dev/null
+++ b/trusty/keymint/android.hardware.hardware_keystore.rust.trusty-keymint.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright 2021 The Android Open Source Project
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
+<permissions>
+  <feature name="android.hardware.hardware_keystore" version="300" />
+</permissions>
diff --git a/trusty/keymint/android.hardware.security.keymint-service.rust.trusty.rc b/trusty/keymint/android.hardware.security.keymint-service.rust.trusty.rc
new file mode 100644
index 0000000..e3d94c6
--- /dev/null
+++ b/trusty/keymint/android.hardware.security.keymint-service.rust.trusty.rc
@@ -0,0 +1,7 @@
+service vendor.keymint.rust-trusty /vendor/bin/hw/android.hardware.security.keymint-service.rust.trusty
+    class early_hal
+    user nobody
+    group drmrpc
+    # The keymint service is not allowed to restart.
+    # If it crashes, a device restart is required.
+    oneshot
\ No newline at end of file
diff --git a/trusty/keymint/android.hardware.security.keymint-service.rust.trusty.xml b/trusty/keymint/android.hardware.security.keymint-service.rust.trusty.xml
new file mode 100644
index 0000000..3dc9c88
--- /dev/null
+++ b/trusty/keymint/android.hardware.security.keymint-service.rust.trusty.xml
@@ -0,0 +1,20 @@
+<manifest version="1.0" type="device">
+    <hal format="aidl">
+        <name>android.hardware.security.keymint</name>
+        <version>3</version>
+        <fqname>IKeyMintDevice/default</fqname>
+    </hal>
+    <hal format="aidl">
+        <name>android.hardware.security.secureclock</name>
+        <fqname>ISecureClock/default</fqname>
+    </hal>
+    <hal format="aidl">
+        <name>android.hardware.security.sharedsecret</name>
+        <fqname>ISharedSecret/default</fqname>
+    </hal>
+    <hal format="aidl">
+        <name>android.hardware.security.keymint</name>
+        <version>3</version>
+        <fqname>IRemotelyProvisionedComponent/default</fqname>
+    </hal>
+</manifest>
diff --git a/trusty/keymint/src/keymint_hal_main.rs b/trusty/keymint/src/keymint_hal_main.rs
new file mode 100644
index 0000000..cfa859f
--- /dev/null
+++ b/trusty/keymint/src/keymint_hal_main.rs
@@ -0,0 +1,164 @@
+//
+// Copyright (C) 2022 The Android Open-Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! This module implements the HAL service for Keymint (Rust) in Trusty.
+use kmr_hal::{
+    extract_rsp, keymint, rpc, secureclock, send_hal_info, sharedsecret, SerializedChannel,
+};
+use log::{error, info};
+use std::{
+    ffi::CString,
+    ops::DerefMut,
+    panic,
+    sync::{Arc, Mutex},
+};
+use trusty::DEFAULT_DEVICE;
+
+const TRUSTY_KEYMINT_RUST_SERVICE_NAME: &str = "com.android.trusty.keymint";
+
+static SERVICE_INSTANCE: &str = "default";
+
+static KM_SERVICE_NAME: &str = "android.hardware.security.keymint.IKeyMintDevice";
+static RPC_SERVICE_NAME: &str = "android.hardware.security.keymint.IRemotelyProvisionedComponent";
+static SECURE_CLOCK_SERVICE_NAME: &str = "android.hardware.security.secureclock.ISecureClock";
+static SHARED_SECRET_SERVICE_NAME: &str = "android.hardware.security.sharedsecret.ISharedSecret";
+
+/// Local error type for failures in the HAL service.
+#[derive(Debug, Clone)]
+struct HalServiceError(String);
+
+#[derive(Debug)]
+struct TipcChannel(trusty::TipcChannel);
+
+impl SerializedChannel for TipcChannel {
+    const MAX_SIZE: usize = 4000;
+    fn execute(&mut self, serialized_req: &[u8]) -> binder::Result<Vec<u8>> {
+        self.0.send(serialized_req).map_err(|e| {
+            binder::Status::new_exception(
+                binder::ExceptionCode::TRANSACTION_FAILED,
+                Some(
+                    &CString::new(format!(
+                        "Failed to send the request via tipc channel because of {:?}",
+                        e
+                    ))
+                    .unwrap(),
+                ),
+            )
+        })?;
+        let mut expect_more_msgs = true;
+        let mut full_rsp = Vec::new();
+        while expect_more_msgs {
+            let mut recv_buf = Vec::new();
+            self.0.recv(&mut recv_buf).map_err(|e| {
+                binder::Status::new_exception(
+                    binder::ExceptionCode::TRANSACTION_FAILED,
+                    Some(
+                        &CString::new(format!(
+                            "Failed to receive the response via tipc channel because of {:?}",
+                            e
+                        ))
+                        .unwrap(),
+                    ),
+                )
+            })?;
+            let current_rsp_content;
+            (expect_more_msgs, current_rsp_content) = extract_rsp(&recv_buf)?;
+            full_rsp.extend_from_slice(current_rsp_content);
+        }
+        Ok(full_rsp)
+    }
+}
+
+fn main() {
+    if let Err(e) = inner_main() {
+        panic!("HAL service failed: {:?}", e);
+    }
+}
+
+fn inner_main() -> Result<(), HalServiceError> {
+    // Initialize Android logging.
+    android_logger::init_once(
+        android_logger::Config::default()
+            .with_tag("keymint-hal-trusty")
+            .with_min_level(log::Level::Info)
+            .with_log_id(android_logger::LogId::System),
+    );
+    // Redirect panic messages to logcat.
+    panic::set_hook(Box::new(|panic_info| {
+        error!("{}", panic_info);
+    }));
+
+    info!("Trusty KM HAL service is starting.");
+
+    info!("Starting thread pool now.");
+    binder::ProcessState::start_thread_pool();
+
+    // Create connection to the TA
+    let connection = trusty::TipcChannel::connect(DEFAULT_DEVICE, TRUSTY_KEYMINT_RUST_SERVICE_NAME)
+        .map_err(|e| {
+            HalServiceError(format!("Failed to connect to Trusty Keymint TA because of {:?}.", e))
+        })?;
+    let tipc_channel = Arc::new(Mutex::new(TipcChannel(connection)));
+
+    // Register the Keymint service
+    let km_service = keymint::Device::new_as_binder(tipc_channel.clone());
+    let km_service_name = format!("{}/{}", KM_SERVICE_NAME, SERVICE_INSTANCE);
+    binder::add_service(&km_service_name, km_service.as_binder()).map_err(|e| {
+        HalServiceError(format!(
+            "Failed to register service {} because of {:?}.",
+            km_service_name, e
+        ))
+    })?;
+
+    // Register the Remotely Provisioned Component service
+    let rpc_service = rpc::Device::new_as_binder(tipc_channel.clone());
+    let rpc_service_name = format!("{}/{}", RPC_SERVICE_NAME, SERVICE_INSTANCE);
+    binder::add_service(&rpc_service_name, rpc_service.as_binder()).map_err(|e| {
+        HalServiceError(format!(
+            "Failed to register service {} because of {:?}.",
+            rpc_service_name, e
+        ))
+    })?;
+
+    // Register the Secure Clock service
+    let sclock_service = secureclock::Device::new_as_binder(tipc_channel.clone());
+    let sclock_service_name = format!("{}/{}", SECURE_CLOCK_SERVICE_NAME, SERVICE_INSTANCE);
+    binder::add_service(&sclock_service_name, sclock_service.as_binder()).map_err(|e| {
+        HalServiceError(format!(
+            "Failed to register service {} because of {:?}.",
+            sclock_service_name, e
+        ))
+    })?;
+
+    // Register the Shared Secret service
+    let ssecret_service = sharedsecret::Device::new_as_binder(tipc_channel.clone());
+    let ssecret_service_name = format!("{}/{}", SHARED_SECRET_SERVICE_NAME, SERVICE_INSTANCE);
+    binder::add_service(&ssecret_service_name, ssecret_service.as_binder()).map_err(|e| {
+        HalServiceError(format!(
+            "Failed to register service {} because of {:?}.",
+            ssecret_service_name, e
+        ))
+    })?;
+
+    // Send the HAL service information to the TA
+    send_hal_info(tipc_channel.lock().unwrap().deref_mut())
+        .map_err(|e| HalServiceError(format!("Failed to populate HAL info: {:?}", e)))?;
+
+    info!("Successfully registered KeyMint HAL services.");
+    info!("Joining thread pool now.");
+    binder::ProcessState::join_thread_pool();
+    info!("KeyMint HAL service is terminating."); // should not reach here
+    Ok(())
+}
diff --git a/trusty/libtrusty-rs/Android.bp b/trusty/libtrusty-rs/Android.bp
index bc1dcf6..4fc162b 100644
--- a/trusty/libtrusty-rs/Android.bp
+++ b/trusty/libtrusty-rs/Android.bp
@@ -19,6 +19,7 @@
 rust_library {
     name: "libtrusty-rs",
     crate_name: "trusty",
+    vendor_available: true,
     srcs: [
         "src/lib.rs"
     ],
diff --git a/trusty/metrics/metrics_test.cpp b/trusty/metrics/metrics_test.cpp
index 407ddf2..0c6db7f 100644
--- a/trusty/metrics/metrics_test.cpp
+++ b/trusty/metrics/metrics_test.cpp
@@ -31,7 +31,7 @@
 using android::base::unique_fd;
 
 static void TriggerCrash() {
-    size_t num_retries = 3;
+    size_t num_retries = 6;
     int fd = -1;
 
     for (size_t i = 0; i < num_retries; i++) {
@@ -61,6 +61,18 @@
     virtual void SetUp() override {
         auto ret = Open();
         ASSERT_TRUE(ret.ok()) << ret.error();
+
+        /* Drain events (if any) and reset state */
+        DrainEvents();
+        crashed_app_.clear();
+        event_drop_count_ = 0;
+    }
+
+    void DrainEvents() {
+        while (WaitForEvent(1000 /* 1 second timeout */).ok()) {
+            auto ret = HandleEvent();
+            ASSERT_TRUE(ret.ok()) << ret.error();
+        }
     }
 
     void WaitForAndHandleEvent() {
@@ -79,6 +91,9 @@
     TriggerCrash();
     WaitForAndHandleEvent();
 
+    /* Check that no event was dropped. */
+    ASSERT_EQ(event_drop_count_, 0);
+
     /* Check that correct TA crashed. */
     ASSERT_EQ(crashed_app_, "36f5b435-5bd3-4526-8b76-200e3a7e79f3:crasher");
 }
@@ -110,6 +125,9 @@
     auto ret = HandleEvent();
     ASSERT_TRUE(ret.ok()) << ret.error();
 
+    /* Check that no event was dropped. */
+    ASSERT_EQ(event_drop_count_, 0);
+
     /* Check that correct TA crashed. */
     ASSERT_EQ(crashed_app_, "36f5b435-5bd3-4526-8b76-200e3a7e79f3:crasher");
 }
diff --git a/trusty/storage/interface/include/trusty/interface/storage.h b/trusty/storage/interface/include/trusty/interface/storage.h
index 255ade1..3291607 100644
--- a/trusty/storage/interface/include/trusty/interface/storage.h
+++ b/trusty/storage/interface/include/trusty/interface/storage.h
@@ -53,6 +53,8 @@
 
 	/* transaction support */
 	STORAGE_END_TRANSACTION = 9 << STORAGE_REQ_SHIFT,
+
+	STORAGE_FILE_GET_MAX_SIZE = 12 << STORAGE_REQ_SHIFT,
 };
 
 /**
@@ -184,6 +186,24 @@
 };
 
 /**
+ * struct storage_file_get_max_size_req - request format for
+ *                                        STORAGE_FILE_GET_MAX_SIZE
+ * @handle: the handle for the file whose max size is requested
+ */
+struct storage_file_get_max_size_req {
+	uint32_t handle;
+};
+
+/**
+ * struct storage_file_get_max_size_resp - response format for
+ *                                         STORAGE_FILE_GET_MAX_SIZE
+ * @max_size:   the maximum size of the file
+ */
+struct storage_file_get_max_size_resp {
+	uint64_t max_size;
+};
+
+/**
  * struct storage_file_read_req - request format for STORAGE_FILE_READ
  * @handle: the handle for the file from which to read
  * @size:   the quantity of bytes to read from the file
diff --git a/trusty/storage/proxy/Android.bp b/trusty/storage/proxy/Android.bp
index 94f26d8..e952ee0 100644
--- a/trusty/storage/proxy/Android.bp
+++ b/trusty/storage/proxy/Android.bp
@@ -32,11 +32,11 @@
 
     shared_libs: [
         "libbase",
+        "libcutils",
         "liblog",
         "libhardware_legacy",
     ],
     header_libs: [
-        "libcutils_headers",
         "libgsi_headers",
     ],
 
diff --git a/trusty/storage/proxy/proxy.c b/trusty/storage/proxy/proxy.c
index f015892..4f77fa2 100644
--- a/trusty/storage/proxy/proxy.c
+++ b/trusty/storage/proxy/proxy.c
@@ -70,49 +70,6 @@
     exit(code);
 }
 
-static int drop_privs(void) {
-    struct __user_cap_header_struct capheader;
-    struct __user_cap_data_struct capdata[2];
-
-    if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) < 0) {
-        return -1;
-    }
-
-    /*
-     * ensure we're running as the system user
-     */
-    if (setgid(AID_SYSTEM) != 0) {
-        return -1;
-    }
-
-    if (setuid(AID_SYSTEM) != 0) {
-        return -1;
-    }
-
-    /*
-     * drop all capabilities except SYS_RAWIO
-     */
-    memset(&capheader, 0, sizeof(capheader));
-    memset(&capdata, 0, sizeof(capdata));
-    capheader.version = _LINUX_CAPABILITY_VERSION_3;
-    capheader.pid = 0;
-
-    capdata[CAP_TO_INDEX(CAP_SYS_RAWIO)].permitted = CAP_TO_MASK(CAP_SYS_RAWIO);
-    capdata[CAP_TO_INDEX(CAP_SYS_RAWIO)].effective = CAP_TO_MASK(CAP_SYS_RAWIO);
-
-    if (capset(&capheader, &capdata[0]) < 0) {
-        return -1;
-    }
-
-    /*
-     * No access for group and other. We need execute access for user to create
-     * an accessible directory.
-     */
-    umask(S_IRWXG | S_IRWXO);
-
-    return 0;
-}
-
 static int handle_req(struct storage_msg* msg, const void* req, size_t req_len) {
     int rc;
 
@@ -179,6 +136,10 @@
             rc = storage_file_set_size(msg, req, req_len);
             break;
 
+        case STORAGE_FILE_GET_MAX_SIZE:
+            rc = storage_file_get_max_size(msg, req, req_len);
+            break;
+
         case STORAGE_RPMB_SEND:
             rc = rpmb_send(msg, req, req_len);
             break;
@@ -261,8 +222,11 @@
 int main(int argc, char* argv[]) {
     int rc;
 
-    /* drop privileges */
-    if (drop_privs() < 0) return EXIT_FAILURE;
+    /*
+     * No access for group and other. We need execute access for user to create
+     * an accessible directory.
+     */
+    umask(S_IRWXG | S_IRWXO);
 
     /* parse arguments */
     parse_args(argc, argv);
diff --git a/trusty/storage/proxy/rpmb.c b/trusty/storage/proxy/rpmb.c
index f059935..b1b8232 100644
--- a/trusty/storage/proxy/rpmb.c
+++ b/trusty/storage/proxy/rpmb.c
@@ -322,9 +322,9 @@
 }
 
 static int send_mmc_rpmb_req(int mmc_fd, const struct storage_rpmb_send_req* req) {
-    struct {
+    union {
         struct mmc_ioc_multi_cmd multi;
-        struct mmc_ioc_cmd cmd_buf[3];
+        uint8_t raw[sizeof(struct mmc_ioc_multi_cmd) + sizeof(struct mmc_ioc_cmd) * 3];
     } mmc = {};
     struct mmc_ioc_cmd* cmd = mmc.multi.cmds;
     int rc;
diff --git a/trusty/storage/proxy/storage.c b/trusty/storage/proxy/storage.c
index c531cfd..a96ddcb 100644
--- a/trusty/storage/proxy/storage.c
+++ b/trusty/storage/proxy/storage.c
@@ -13,10 +13,12 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+#include <cutils/properties.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <inttypes.h>
 #include <libgen.h>
+#include <linux/fs.h>
 #include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
@@ -35,6 +37,9 @@
 
 #define ALTERNATE_DATA_DIR "alternate/"
 
+/* Maximum file size for filesystem backed storage (i.e. not block dev backed storage) */
+#define MAX_FILE_SIZE (0x10000000000)
+
 enum sync_state {
     SS_UNUSED = -1,
     SS_CLEAN =  0,
@@ -43,6 +48,22 @@
 
 static const char *ssdir_name;
 
+/*
+ * Property set to 1 after we have opened a file under ssdir_name. The backing
+ * files for both TD and TDP are currently located under /data/vendor/ss and can
+ * only be opened once userdata is mounted. This storageproxyd service is
+ * restarted when userdata is available, which causes the Trusty storage service
+ * to reconnect and attempt to open the backing files for TD and TDP. Once we
+ * set this property, other users can expect that the Trusty storage service
+ * ports will be available (although they may block if still being initialized),
+ * and connections will not be reset after this point (assuming the
+ * storageproxyd service stays running).
+ */
+#define FS_READY_PROPERTY "ro.vendor.trusty.storage.fs_ready"
+
+/* has FS_READY_PROPERTY been set? */
+static bool fs_ready_initialized = false;
+
 static enum sync_state fs_state;
 static enum sync_state fd_state[FD_TBL_SIZE];
 
@@ -336,6 +357,16 @@
     ALOGV("%s: \"%s\": fd = %u: handle = %d\n",
           __func__, path, rc, resp.handle);
 
+    /* a backing file has been opened, notify any waiting init steps */
+    if (!fs_ready_initialized) {
+        rc = property_set(FS_READY_PROPERTY, "1");
+        if (rc == 0) {
+            fs_ready_initialized = true;
+        } else {
+            ALOGE("Could not set property %s, rc: %d\n", FS_READY_PROPERTY, rc);
+        }
+    }
+
     return ipc_respond(msg, &resp, sizeof(resp));
 
 err_response:
@@ -522,6 +553,45 @@
     return ipc_respond(msg, NULL, 0);
 }
 
+int storage_file_get_max_size(struct storage_msg* msg, const void* r, size_t req_len) {
+    const struct storage_file_get_max_size_req* req = r;
+    struct storage_file_get_max_size_resp resp = {0};
+    uint64_t max_size = 0;
+
+    if (req_len != sizeof(*req)) {
+        ALOGE("%s: invalid request length (%zd != %zd)\n", __func__, req_len, sizeof(*req));
+        msg->result = STORAGE_ERR_NOT_VALID;
+        goto err_response;
+    }
+
+    struct stat stat;
+    int fd = lookup_fd(req->handle, false);
+    int rc = fstat(fd, &stat);
+    if (rc < 0) {
+        ALOGE("%s: error stat'ing file (fd=%d): %s\n", __func__, fd, strerror(errno));
+        goto err_response;
+    }
+
+    if ((stat.st_mode & S_IFMT) == S_IFBLK) {
+        rc = ioctl(fd, BLKGETSIZE64, &max_size);
+        if (rc < 0) {
+            rc = errno;
+            ALOGE("%s: error calling ioctl on file (fd=%d): %s\n", __func__, fd, strerror(errno));
+            msg->result = translate_errno(rc);
+            goto err_response;
+        }
+    } else {
+        max_size = MAX_FILE_SIZE;
+    }
+
+    resp.max_size = max_size;
+    msg->result = STORAGE_NO_ERROR;
+    return ipc_respond(msg, &resp, sizeof(resp));
+
+err_response:
+    return ipc_respond(msg, NULL, 0);
+}
+
 int storage_init(const char *dirname)
 {
     /* If there is an active DSU image, use the alternate fs mode. */
diff --git a/trusty/storage/proxy/storage.h b/trusty/storage/proxy/storage.h
index 5a670d4..77bfa13 100644
--- a/trusty/storage/proxy/storage.h
+++ b/trusty/storage/proxy/storage.h
@@ -39,6 +39,8 @@
 int storage_file_set_size(struct storage_msg *msg,
                           const void *req, size_t req_len);
 
+int storage_file_get_max_size(struct storage_msg* msg, const void* req, size_t req_len);
+
 int storage_init(const char *dirname);
 
 int storage_sync_checkpoint(void);
diff --git a/trusty/test/binder/aidl/com/android/trusty/binder/test/ByteEnum.aidl b/trusty/test/binder/aidl/com/android/trusty/binder/test/ByteEnum.aidl
new file mode 100644
index 0000000..9c712c0
--- /dev/null
+++ b/trusty/test/binder/aidl/com/android/trusty/binder/test/ByteEnum.aidl
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.trusty.binder.test;
+
+/*
+ * Hello, world!
+ */
+@Backing(type="byte")
+enum ByteEnum {
+    // Comment about FOO.
+    FOO = 1,
+    BAR = 2,
+    BAZ,
+}
diff --git a/trusty/test/binder/aidl/com/android/trusty/binder/test/ITestService.aidl b/trusty/test/binder/aidl/com/android/trusty/binder/test/ITestService.aidl
new file mode 100644
index 0000000..cfbb246
--- /dev/null
+++ b/trusty/test/binder/aidl/com/android/trusty/binder/test/ITestService.aidl
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.trusty.binder.test;
+
+import com.android.trusty.binder.test.ByteEnum;
+import com.android.trusty.binder.test.IntEnum;
+import com.android.trusty.binder.test.LongEnum;
+
+interface ITestService {
+    const @utf8InCpp String PORT = "com.android.trusty.binder.test.service";
+
+    const int TEST_CONSTANT = 42;
+    const int TEST_CONSTANT2 = -42;
+    const int TEST_CONSTANT3 = +42;
+    const int TEST_CONSTANT4 = +4;
+    const int TEST_CONSTANT5 = -4;
+    const int TEST_CONSTANT6 = -0;
+    const int TEST_CONSTANT7 = +0;
+    const int TEST_CONSTANT8 = 0;
+    const int TEST_CONSTANT9 = 0x56;
+    const int TEST_CONSTANT10 = 0xa5;
+    const int TEST_CONSTANT11 = 0xFA;
+    const int TEST_CONSTANT12 = 0xffffffff;
+
+    const byte BYTE_TEST_CONSTANT = 17;
+    const long LONG_TEST_CONSTANT = 1L << 40;
+
+    const String STRING_TEST_CONSTANT = "foo";
+    const String STRING_TEST_CONSTANT2 = "bar";
+
+    // Test that primitives work as parameters and return types.
+    boolean RepeatBoolean(boolean token);
+    byte RepeatByte(byte token);
+    char RepeatChar(char token);
+    int RepeatInt(int token);
+    long RepeatLong(long token);
+    float RepeatFloat(float token);
+    double RepeatDouble(double token);
+    String RepeatString(String token);
+    ByteEnum RepeatByteEnum(ByteEnum token);
+    IntEnum RepeatIntEnum(IntEnum token);
+    LongEnum RepeatLongEnum(LongEnum token);
+
+    // Test that arrays work as parameters and return types.
+    boolean[] ReverseBoolean(in boolean[] input, out boolean[] repeated);
+    byte[] ReverseByte(in byte[] input, out byte[] repeated);
+    char[] ReverseChar(in char[] input, out char[] repeated);
+    int[] ReverseInt(in int[] input, out int[] repeated);
+    long[] ReverseLong(in long[] input, out long[] repeated);
+    float[] ReverseFloat(in float[] input, out float[] repeated);
+    double[] ReverseDouble(in double[] input, out double[] repeated);
+    String[] ReverseString(in String[] input, out String[] repeated);
+    ByteEnum[] ReverseByteEnum(in ByteEnum[] input, out ByteEnum[] repeated);
+    IntEnum[] ReverseIntEnum(in IntEnum[] input, out IntEnum[] repeated);
+    LongEnum[] ReverseLongEnum(in LongEnum[] input, out LongEnum[] repeated);
+}
diff --git a/trusty/test/binder/aidl/com/android/trusty/binder/test/IntEnum.aidl b/trusty/test/binder/aidl/com/android/trusty/binder/test/IntEnum.aidl
new file mode 100644
index 0000000..4055b25
--- /dev/null
+++ b/trusty/test/binder/aidl/com/android/trusty/binder/test/IntEnum.aidl
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.trusty.binder.test;
+
+@JavaDerive(toString=true)
+@Backing(type="int")
+enum IntEnum {
+    FOO = 1000,
+    BAR = 2000,
+    BAZ,
+    /** @deprecated do not use this */
+    QUX,
+}
diff --git a/trusty/test/binder/aidl/com/android/trusty/binder/test/LongEnum.aidl b/trusty/test/binder/aidl/com/android/trusty/binder/test/LongEnum.aidl
new file mode 100644
index 0000000..20c64af
--- /dev/null
+++ b/trusty/test/binder/aidl/com/android/trusty/binder/test/LongEnum.aidl
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.trusty.binder.test;
+
+@Backing(type="long")
+enum LongEnum {
+    FOO = 100000000000,
+    BAR = 200000000000,
+    BAZ,
+}
diff --git a/trusty/test/binder/aidl/rules.mk b/trusty/test/binder/aidl/rules.mk
new file mode 100644
index 0000000..546a370
--- /dev/null
+++ b/trusty/test/binder/aidl/rules.mk
@@ -0,0 +1,28 @@
+# Copyright (C) 2022 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+LOCAL_DIR := $(GET_LOCAL_DIR)
+
+MODULE := $(LOCAL_DIR)
+
+MODULE_AIDL_PACKAGE := com/android/trusty/binder/test
+
+MODULE_AIDLS := \
+	$(LOCAL_DIR)/$(MODULE_AIDL_PACKAGE)/ByteEnum.aidl \
+	$(LOCAL_DIR)/$(MODULE_AIDL_PACKAGE)/IntEnum.aidl \
+	$(LOCAL_DIR)/$(MODULE_AIDL_PACKAGE)/ITestService.aidl \
+	$(LOCAL_DIR)/$(MODULE_AIDL_PACKAGE)/LongEnum.aidl \
+
+include make/aidl.mk
diff --git a/trusty/trusty-base.mk b/trusty/trusty-base.mk
index d40a59e..7b4aa26 100644
--- a/trusty/trusty-base.mk
+++ b/trusty/trusty-base.mk
@@ -22,10 +22,24 @@
 # For gatekeeper, we include the generic -service and -impl to use legacy
 # HAL loading of gatekeeper.trusty.
 
+# Allow the KeyMint HAL service implementation to be selected at build time.  This needs to be
+# done in sync with the TA implementation included in Trusty.  Possible values are:
+#
+# - Rust implementation:   export TRUSTY_KEYMINT_IMPL=rust
+# - C++ implementation:    (any other value of TRUSTY_KEYMINT_IMPL)
+
+ifeq ($(TRUSTY_KEYMINT_IMPL),rust)
+    LOCAL_KEYMINT_PRODUCT_PACKAGE := android.hardware.security.keymint-service.rust.trusty
+else
+    # Default to the C++ implementation
+    LOCAL_KEYMINT_PRODUCT_PACKAGE := android.hardware.security.keymint-service.trusty
+endif
+
 PRODUCT_PACKAGES += \
-	android.hardware.security.keymint-service.trusty \
+	$(LOCAL_KEYMINT_PRODUCT_PACKAGE) \
 	android.hardware.gatekeeper@1.0-service.trusty \
-	trusty_apploader
+	trusty_apploader \
+	RemoteProvisioner
 
 PRODUCT_PROPERTY_OVERRIDES += \
 	ro.hardware.keystore_desede=true \
diff --git a/trusty/utils/acvp/acvp_ipc.h b/trusty/utils/acvp/acvp_ipc.h
index 300e05a..fc1c9d7 100644
--- a/trusty/utils/acvp/acvp_ipc.h
+++ b/trusty/utils/acvp/acvp_ipc.h
@@ -45,7 +45,7 @@
  * This must be at least as long as the longest reply from the ACVP service
  * (currently the reply from getConfig()).
  */
-#define ACVP_MIN_SHARED_MEMORY 16384
+#define ACVP_MIN_SHARED_MEMORY 32768
 
 /**
  * acvp_req - Request for the Trusty ACVP app