diff --git a/TEST_MAPPING b/TEST_MAPPING
index 7933629..89bd66a 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -16,16 +16,25 @@
       "name": "adb_tls_connection_test"
     },
     {
+      "name": "CtsFsMgrTestCases"
+    },
+    {
       "name": "CtsInitTestCases"
     },
     {
+      "name": "CtsLiblogTestCases"
+    },
+    {
+      "name": "CtsLogdTestCases"
+    },
+    {
       "name": "debuggerd_test"
     },
     {
-      "name": "CtsFsMgrTestCases"
+      "name": "fs_mgr_vendor_overlay_test"
     },
     {
-      "name": "fs_mgr_vendor_overlay_test"
+      "name": "init_kill_services_test"
     },
     {
       "name": "libpackagelistparser_test"
@@ -58,5 +67,10 @@
     {
       "name": "propertyinfoserializer_tests"
     }
+  ],
+  "imports": [
+    {
+      "path": "frameworks/base/tests/StagedInstallTest"
+    }
   ]
 }
diff --git a/adb/Android.bp b/adb/Android.bp
index 2fc205f..8addf95 100644
--- a/adb/Android.bp
+++ b/adb/Android.bp
@@ -12,6 +12,11 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+tidy_errors = [
+    "-*",
+    "bugprone-inaccurate-erase",
+]
+
 cc_defaults {
     name: "adb_defaults",
 
@@ -73,6 +78,10 @@
             ],
         },
     },
+
+    tidy: true,
+    tidy_checks: tidy_errors,
+    tidy_checks_as_errors: tidy_errors,
 }
 
 cc_defaults {
@@ -108,6 +117,7 @@
     static_libs: [
         "libadb_crypto",
         "libadb_pairing_connection",
+        "libadb_sysdeps",
         "libadb_tls_connection",
         "libadbd",
         "libadbd_core",
@@ -158,6 +168,7 @@
     "services.cpp",
     "sockets.cpp",
     "socket_spec.cpp",
+    "sysdeps/env.cpp",
     "sysdeps/errno.cpp",
     "transport.cpp",
     "transport_fd.cpp",
@@ -252,6 +263,43 @@
     ],
 }
 
+cc_library {
+    name: "libadb_sysdeps",
+    defaults: ["adb_defaults"],
+    recovery_available: true,
+    host_supported: true,
+    compile_multilib: "both",
+    min_sdk_version: "apex_inherit",
+
+    srcs: [
+        "sysdeps/env.cpp",
+    ],
+
+    shared_libs: [
+        "libbase",
+        "liblog",
+    ],
+
+    target: {
+        windows: {
+            enabled: true,
+            ldflags: ["-municode"],
+        },
+    },
+
+    export_include_dirs: ["."],
+
+    visibility: [
+        "//system/core/adb:__subpackages__",
+        "//bootable/recovery/minadbd:__subpackages__",
+    ],
+
+    apex_available: [
+        "com.android.adbd",
+        "test_com.android.adbd",
+    ],
+}
+
 cc_test_host {
     name: "adb_test",
     defaults: ["adb_defaults"],
@@ -265,6 +313,7 @@
         "libadb_pairing_auth_static",
         "libadb_pairing_connection_static",
         "libadb_protos_static",
+        "libadb_sysdeps",
         "libadb_tls_connection_static",
         "libbase",
         "libcutils",
@@ -321,6 +370,7 @@
         "libadb_pairing_auth",
         "libadb_pairing_connection",
         "libadb_protos",
+        "libadb_sysdeps",
         "libadb_tls_connection",
         "libandroidfw",
         "libapp_processes_protos_full",
@@ -822,6 +872,7 @@
         "libadb_pairing_auth_static",
         "libadb_pairing_connection_static",
         "libadb_protos_static",
+        "libadb_sysdeps",
         "libadb_tls_connection_static",
         "libandroidfw",
         "libbase",
diff --git a/adb/adb_utils.h b/adb/adb_utils.h
index 66cba12..e72d8b6 100644
--- a/adb/adb_utils.h
+++ b/adb/adb_utils.h
@@ -55,7 +55,7 @@
 
 bool set_file_block_mode(borrowed_fd fd, bool block);
 
-// Given forward/reverse targets, returns true if they look sane. If an error is found, fills
+// Given forward/reverse targets, returns true if they look valid. If an error is found, fills
 // |error| and returns false.
 // Currently this only checks "tcp:" targets. Additional checking could be added for other targets
 // if needed.
diff --git a/adb/client/adb_install.cpp b/adb/client/adb_install.cpp
index d6f536e..ea50f59 100644
--- a/adb/client/adb_install.cpp
+++ b/adb/client/adb_install.cpp
@@ -876,7 +876,7 @@
                     "-S",
                     std::to_string(sb.st_size),
                     session_id_str,
-                    android::base::StringPrintf("%d_%s", i, android::base::Basename(file).c_str()),
+                    android::base::StringPrintf("%d_%s", i, android::base::Basename(split).c_str()),
                     "-",
             };
 
diff --git a/adb/client/auth.cpp b/adb/client/auth.cpp
index b674a81..db4c479 100644
--- a/adb/client/auth.cpp
+++ b/adb/client/auth.cpp
@@ -400,12 +400,12 @@
     for (const std::string& path : paths) {
         int wd = inotify_add_watch(infd, path.c_str(), IN_CREATE | IN_MOVED_TO);
         if (wd < 0) {
-            PLOG(ERROR) << "failed to inotify_add_watch on path '" << path;
+            PLOG(ERROR) << "failed to inotify_add_watch on path '" << path << "'";
             continue;
         }
 
         g_monitored_paths[wd] = path;
-        LOG(INFO) << "watch descriptor " << wd << " registered for " << path;
+        LOG(INFO) << "watch descriptor " << wd << " registered for '" << path << "'";
     }
 
     fdevent* event = fdevent_create(infd, adb_auth_inotify_update, nullptr);
diff --git a/adb/client/incremental.cpp b/adb/client/incremental.cpp
index 3033059..60735f8 100644
--- a/adb/client/incremental.cpp
+++ b/adb/client/incremental.cpp
@@ -55,9 +55,10 @@
         return {};
     }
 
-    std::vector<char> invalid_signature;
+    auto [signature, tree_size] = read_id_sig_headers(fd);
 
-    if (st.st_size > kMaxSignatureSize) {
+    std::vector<char> invalid_signature;
+    if (signature.size() > kMaxSignatureSize) {
         if (!silent) {
             fprintf(stderr, "Signature is too long. Max allowed is %d. Abort.\n",
                     kMaxSignatureSize);
@@ -65,7 +66,6 @@
         return {std::move(fd), std::move(invalid_signature)};
     }
 
-    auto [signature, tree_size] = read_id_sig_headers(fd);
     if (auto expected = verity_tree_size_for_file(file_size); tree_size != expected) {
         if (!silent) {
             fprintf(stderr,
diff --git a/adb/crypto/Android.bp b/adb/crypto/Android.bp
index 9d14b03..e2c27f1 100644
--- a/adb/crypto/Android.bp
+++ b/adb/crypto/Android.bp
@@ -48,6 +48,7 @@
 
     shared_libs: [
         "libadb_protos",
+        "libadb_sysdeps",
         "libbase",
         "liblog",
         "libcrypto",
@@ -76,5 +77,6 @@
 
     static_libs: [
         "libadb_protos_static",
+        "libadb_sysdeps",
     ],
 }
diff --git a/adb/crypto/rsa_2048_key.cpp b/adb/crypto/rsa_2048_key.cpp
index 7911af9..6d9ee30 100644
--- a/adb/crypto/rsa_2048_key.cpp
+++ b/adb/crypto/rsa_2048_key.cpp
@@ -20,32 +20,11 @@
 #include <crypto_utils/android_pubkey.h>
 #include <openssl/bn.h>
 #include <openssl/rsa.h>
+#include <sysdeps/env.h>
 
 namespace adb {
 namespace crypto {
 
-namespace {
-std::string get_user_info() {
-    std::string hostname;
-    if (getenv("HOSTNAME")) hostname = getenv("HOSTNAME");
-#if !defined(_WIN32)
-    char buf[64];
-    if (hostname.empty() && gethostname(buf, sizeof(buf)) != -1) hostname = buf;
-#endif
-    if (hostname.empty()) hostname = "unknown";
-
-    std::string username;
-    if (getenv("LOGNAME")) username = getenv("LOGNAME");
-#if !defined(_WIN32)
-    if (username.empty() && getlogin()) username = getlogin();
-#endif
-    if (username.empty()) hostname = "unknown";
-
-    return " " + username + "@" + hostname;
-}
-
-}  // namespace
-
 bool CalculatePublicKey(std::string* out, RSA* private_key) {
     uint8_t binary_key_data[ANDROID_PUBKEY_ENCODED_SIZE];
     if (!android_pubkey_encode(private_key, binary_key_data, sizeof(binary_key_data))) {
@@ -63,7 +42,10 @@
     size_t actual_length = EVP_EncodeBlock(reinterpret_cast<uint8_t*>(out->data()), binary_key_data,
                                            sizeof(binary_key_data));
     out->resize(actual_length);
-    out->append(get_user_info());
+    out->append(" ");
+    out->append(sysdeps::GetLoginNameUTF8());
+    out->append("@");
+    out->append(sysdeps::GetHostNameUTF8());
     return true;
 }
 
diff --git a/adb/crypto/tests/Android.bp b/adb/crypto/tests/Android.bp
index b32dcf7..b041055 100644
--- a/adb/crypto/tests/Android.bp
+++ b/adb/crypto/tests/Android.bp
@@ -35,6 +35,7 @@
     static_libs: [
         "libadb_crypto_static",
         "libadb_protos_static",
+        "libadb_sysdeps",
     ],
 
     test_suites: ["device-tests"],
diff --git a/adb/fdevent/fdevent_test.h b/adb/fdevent/fdevent_test.h
index ecda4da..fcbf181 100644
--- a/adb/fdevent/fdevent_test.h
+++ b/adb/fdevent/fdevent_test.h
@@ -65,7 +65,7 @@
         ASSERT_EQ(0u, fdevent_installed_count());
     }
 
-    // Register a dummy socket used to wake up the fdevent loop to tell it to die.
+    // Register a placeholder socket used to wake up the fdevent loop to tell it to die.
     void PrepareThread() {
         int dummy_fds[2];
         if (adb_socketpair(dummy_fds) != 0) {
@@ -84,7 +84,7 @@
     }
 
     size_t GetAdditionalLocalSocketCount() {
-        // dummy socket installed in PrepareThread()
+        // placeholder socket installed in PrepareThread()
         return 1;
     }
 
diff --git a/adb/sockets.cpp b/adb/sockets.cpp
index 13a4737..33b9524 100644
--- a/adb/sockets.cpp
+++ b/adb/sockets.cpp
@@ -856,7 +856,7 @@
     s->peer->shutdown = nullptr;
     s->peer->close = local_socket_close_notify;
     s->peer->peer = nullptr;
-    /* give him our transport and upref it */
+    /* give them our transport and upref it */
     s->peer->transport = s->transport;
 
     connect_to_remote(s->peer, std::string_view(s->smart_socket_data).substr(4));
diff --git a/adb/sysdeps/env.cpp b/adb/sysdeps/env.cpp
new file mode 100644
index 0000000..4058728
--- /dev/null
+++ b/adb/sysdeps/env.cpp
@@ -0,0 +1,122 @@
+/*
+ * 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 "sysdeps/env.h"
+
+#ifdef _WIN32
+#include <lmcons.h>
+#include <windows.h>
+#endif  // _WIN32
+
+#include <android-base/utf8.h>
+
+namespace adb {
+namespace sysdeps {
+
+std::optional<std::string> GetEnvironmentVariable(std::string_view var) {
+    if (var.empty()) {
+        return std::nullopt;
+    }
+
+#ifdef _WIN32
+    constexpr size_t kMaxEnvVarSize = 32767;
+    wchar_t wbuf[kMaxEnvVarSize];
+    std::wstring wvar;
+    if (!android::base::UTF8ToWide(var.data(), &wvar)) {
+        return std::nullopt;
+    }
+
+    auto sz = ::GetEnvironmentVariableW(wvar.data(), wbuf, sizeof(wbuf));
+    if (sz == 0) {
+        return std::nullopt;
+    }
+
+    std::string val;
+    if (!android::base::WideToUTF8(wbuf, &val)) {
+        return std::nullopt;
+    }
+
+    return std::make_optional(val);
+#else  // !_WIN32
+    const char* val = getenv(var.data());
+    if (val == nullptr) {
+        return std::nullopt;
+    }
+
+    return std::make_optional(std::string(val));
+#endif
+}
+
+#ifdef _WIN32
+constexpr char kHostNameEnvVar[] = "COMPUTERNAME";
+constexpr char kUserNameEnvVar[] = "USERNAME";
+#else
+constexpr char kHostNameEnvVar[] = "HOSTNAME";
+constexpr char kUserNameEnvVar[] = "LOGNAME";
+#endif
+
+std::string GetHostNameUTF8() {
+    const auto hostName = GetEnvironmentVariable(kHostNameEnvVar);
+    if (hostName && !hostName->empty()) {
+        return *hostName;
+    }
+
+#ifdef _WIN32
+    wchar_t wbuf[MAX_COMPUTERNAME_LENGTH + 1];
+    DWORD size = sizeof(wbuf);
+    if (!GetComputerNameW(wbuf, &size) || size == 0) {
+        return "";
+    }
+
+    std::string name;
+    if (!android::base::WideToUTF8(wbuf, &name)) {
+        return "";
+    }
+
+    return name;
+#else   // !_WIN32
+    char buf[256];
+    return (gethostname(buf, sizeof(buf)) == -1) ? "" : buf;
+#endif  // _WIN32
+}
+
+std::string GetLoginNameUTF8() {
+    const auto userName = GetEnvironmentVariable(kUserNameEnvVar);
+    if (userName && !userName->empty()) {
+        return *userName;
+    }
+
+#ifdef _WIN32
+    wchar_t wbuf[UNLEN + 1];
+    DWORD size = sizeof(wbuf);
+    if (!GetUserNameW(wbuf, &size) || size == 0) {
+        return "";
+    }
+
+    std::string login;
+    if (!android::base::WideToUTF8(wbuf, &login)) {
+        return "";
+    }
+
+    return login;
+#else   // !_WIN32
+    const char* login = getlogin();
+    return login ? login : "";
+#endif  // _WIN32
+}
+
+}  // namespace sysdeps
+}  // namespace adb
diff --git a/adb/sysdeps/env.h b/adb/sysdeps/env.h
new file mode 100644
index 0000000..b39b675
--- /dev/null
+++ b/adb/sysdeps/env.h
@@ -0,0 +1,35 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+#include <optional>
+#include <string>
+
+namespace adb {
+namespace sysdeps {
+
+// Attempts to retrieve the environment variable value for |var|. Returns std::nullopt
+// if unset.
+std::optional<std::string> GetEnvironmentVariableUTF8(std::string_view var);
+
+// Gets the host name of the system. Returns empty string on failure.
+std::string GetHostNameUTF8();
+// Gets the current login user. Returns empty string on failure.
+std::string GetLoginNameUTF8();
+
+}  // namespace sysdeps
+}  // namespace adb
diff --git a/adb/sysdeps_win32.cpp b/adb/sysdeps_win32.cpp
index be82bc0..217a6b7 100644
--- a/adb/sysdeps_win32.cpp
+++ b/adb/sysdeps_win32.cpp
@@ -1010,55 +1010,6 @@
     return _fh_to_int(f);
 }
 
-static bool isBlankStr(const char* str) {
-    for (; *str != '\0'; ++str) {
-        if (!isblank(*str)) {
-            return false;
-        }
-    }
-    return true;
-}
-
-int adb_gethostname(char* name, size_t len) {
-    const char* computerName = adb_getenv("COMPUTERNAME");
-    if (computerName && !isBlankStr(computerName)) {
-        strncpy(name, computerName, len);
-        name[len - 1] = '\0';
-        return 0;
-    }
-
-    wchar_t buffer[MAX_COMPUTERNAME_LENGTH + 1];
-    DWORD size = sizeof(buffer);
-    if (!GetComputerNameW(buffer, &size)) {
-        return -1;
-    }
-    std::string name_utf8;
-    if (!android::base::WideToUTF8(buffer, &name_utf8)) {
-        return -1;
-    }
-
-    strncpy(name, name_utf8.c_str(), len);
-    name[len - 1] = '\0';
-    return 0;
-}
-
-int adb_getlogin_r(char* buf, size_t bufsize) {
-    wchar_t buffer[UNLEN + 1];
-    DWORD len = sizeof(buffer);
-    if (!GetUserNameW(buffer, &len)) {
-        return -1;
-    }
-
-    std::string login;
-    if (!android::base::WideToUTF8(buffer, &login)) {
-        return -1;
-    }
-
-    strncpy(buf, login.c_str(), bufsize);
-    buf[bufsize - 1] = '\0';
-    return 0;
-}
-
 #undef accept
 int adb_socket_accept(borrowed_fd serverfd, struct sockaddr* addr, socklen_t* addrlen) {
     FH serverfh = _fh_from_int(serverfd, __func__);
diff --git a/bootstat/boot_reason_test.sh b/bootstat/boot_reason_test.sh
index 2f2919f..7cff7dc 100755
--- a/bootstat/boot_reason_test.sh
+++ b/bootstat/boot_reason_test.sh
@@ -1331,7 +1331,7 @@
     shift
   fi
 
-  # Check if all conditions for the script are sane
+  # Check if all conditions for the script are valid
 
   if [ -z "${ANDROID_SERIAL}" ]; then
     ndev=`(
diff --git a/debuggerd/Android.bp b/debuggerd/Android.bp
index 31c2d5d..ad10a1f 100644
--- a/debuggerd/Android.bp
+++ b/debuggerd/Android.bp
@@ -253,7 +253,6 @@
         "libcutils",
         "libdebuggerd_client",
         "liblog",
-        "libminijail",
         "libnativehelper",
         "libunwindstack",
     ],
@@ -261,6 +260,7 @@
     static_libs: [
         "libdebuggerd",
         "libgmock",
+        "libminijail",
     ],
 
     header_libs: [
diff --git a/debuggerd/client/debuggerd_client.cpp b/debuggerd/client/debuggerd_client.cpp
index 5c02738..6bfb5f2 100644
--- a/debuggerd/client/debuggerd_client.cpp
+++ b/debuggerd/client/debuggerd_client.cpp
@@ -70,36 +70,6 @@
   tv->tv_usec = static_cast<long>(microseconds.count());
 }
 
-static void get_wchan_header(pid_t pid, std::stringstream& buffer) {
-  struct tm now;
-  time_t t = time(nullptr);
-  localtime_r(&t, &now);
-  char timestamp[32];
-  strftime(timestamp, sizeof(timestamp), "%Y-%m-%d %H:%M:%S", &now);
-  std::string time_now(timestamp);
-
-  std::string path = "/proc/" + std::to_string(pid) + "/cmdline";
-
-  char proc_name_buf[1024];
-  const char* proc_name = nullptr;
-  std::unique_ptr<FILE, decltype(&fclose)> fp(fopen(path.c_str(), "r"), &fclose);
-
-  if (fp) {
-    proc_name = fgets(proc_name_buf, sizeof(proc_name_buf), fp.get());
-  }
-
-  if (!proc_name) {
-    proc_name = "<unknown>";
-  }
-
-  buffer << "\n----- Waiting Channels: pid " << pid << " at " << time_now << " -----\n"
-         << "Cmd line: " << proc_name << "\n";
-}
-
-static void get_wchan_footer(pid_t pid, std::stringstream& buffer) {
-  buffer << "----- end " << std::to_string(pid) << " -----\n";
-}
-
 /**
  * Returns the wchan data for each thread in the process,
  * or empty string if unable to obtain any data.
@@ -125,9 +95,10 @@
   }
 
   if (std::string str = data.str(); !str.empty()) {
-    get_wchan_header(pid, buffer);
+    buffer << "\n----- Waiting Channels: pid " << pid << " at " << get_timestamp() << " -----\n"
+           << "Cmd line: " << get_process_name(pid) << "\n";
     buffer << "\n" << str << "\n";
-    get_wchan_footer(pid, buffer);
+    buffer << "----- end " << std::to_string(pid) << " -----\n";
     buffer << "\n";
   }
 
diff --git a/debuggerd/debuggerd_test.cpp b/debuggerd/debuggerd_test.cpp
index 9d7658e..108787e 100644
--- a/debuggerd/debuggerd_test.cpp
+++ b/debuggerd/debuggerd_test.cpp
@@ -18,6 +18,7 @@
 #include <fcntl.h>
 #include <stdlib.h>
 #include <sys/capability.h>
+#include <sys/mman.h>
 #include <sys/prctl.h>
 #include <sys/ptrace.h>
 #include <sys/resource.h>
@@ -172,6 +173,8 @@
   void StartCrasher(const std::string& crash_type);
   void FinishCrasher();
   void AssertDeath(int signo);
+
+  static void Trap(void* ptr);
 };
 
 CrasherTest::CrasherTest() {
@@ -334,6 +337,48 @@
       R"(signal 11 \(SIGSEGV\), code 1 \(SEGV_MAPERR\), fault addr (0x100000000000dead|0xdead))");
 }
 
+// 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();
+}
+
+TEST_F(CrasherTest, heap_addr_in_register) {
+#if defined(__i386__)
+  GTEST_SKIP() << "architecture does not pass arguments in registers";
+#endif
+  int intercept_result;
+  unique_fd output_fd;
+  StartProcess([]() {
+    // Crash with a heap pointer in the first argument register.
+    Trap(malloc(1));
+  });
+
+  StartIntercept(&output_fd);
+  FinishCrasher();
+  int status;
+  ASSERT_EQ(crasher_pid, TIMEOUT(30, waitpid(crasher_pid, &status, 0)));
+  ASSERT_TRUE(WIFSIGNALED(status)) << "crasher didn't terminate via a signal";
+  // Don't test the signal number because different architectures use different signals for
+  // __builtin_trap().
+  FinishIntercept(&intercept_result);
+
+  ASSERT_EQ(1, intercept_result) << "tombstoned reported failure";
+
+  std::string result;
+  ConsumeFd(std::move(output_fd), &result);
+
+#if defined(__aarch64__)
+  ASSERT_MATCH(result, "memory near x0");
+#elif defined(__arm__)
+  ASSERT_MATCH(result, "memory near r0");
+#elif defined(__x86_64__)
+  ASSERT_MATCH(result, "memory near rdi");
+#else
+  ASSERT_TRUE(false) << "unsupported architecture";
+#endif
+}
+
 #if defined(__aarch64__) && defined(ANDROID_EXPERIMENTAL_MTE)
 static void SetTagCheckingLevelSync() {
   int tagged_addr_ctrl = prctl(PR_GET_TAGGED_ADDR_CTRL, 0, 0, 0, 0);
@@ -512,6 +557,55 @@
 #endif
 }
 
+#if defined(__aarch64__) && defined(ANDROID_EXPERIMENTAL_MTE)
+static uintptr_t CreateTagMapping() {
+  uintptr_t mapping =
+      reinterpret_cast<uintptr_t>(mmap(nullptr, getpagesize(), PROT_READ | PROT_WRITE | PROT_MTE,
+                                       MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
+  if (reinterpret_cast<void*>(mapping) == MAP_FAILED) {
+    return 0;
+  }
+  __asm__ __volatile__(".arch_extension mte; stg %0, [%0]"
+                       :
+                       : "r"(mapping + (1ULL << 56))
+                       : "memory");
+  return mapping;
+}
+#endif
+
+TEST_F(CrasherTest, mte_tag_dump) {
+#if defined(__aarch64__) && defined(ANDROID_EXPERIMENTAL_MTE)
+  if (!mte_supported()) {
+    GTEST_SKIP() << "Requires MTE";
+  }
+
+  int intercept_result;
+  unique_fd output_fd;
+  StartProcess([&]() {
+    SetTagCheckingLevelSync();
+    Trap(reinterpret_cast<void *>(CreateTagMapping()));
+  });
+
+  StartIntercept(&output_fd);
+  FinishCrasher();
+  AssertDeath(SIGTRAP);
+  FinishIntercept(&intercept_result);
+
+  ASSERT_EQ(1, intercept_result) << "tombstoned reported failure";
+
+  std::string result;
+  ConsumeFd(std::move(output_fd), &result);
+
+  ASSERT_MATCH(result, R"(memory near x0:
+.*
+.*
+    01.............0 0000000000000000 0000000000000000  ................
+    00.............0)");
+#else
+  GTEST_SKIP() << "Requires aarch64 + ANDROID_EXPERIMENTAL_MTE";
+#endif
+}
+
 TEST_F(CrasherTest, LD_PRELOAD) {
   int intercept_result;
   unique_fd output_fd;
diff --git a/debuggerd/libdebuggerd/backtrace.cpp b/debuggerd/libdebuggerd/backtrace.cpp
index c606970..f5a873c 100644
--- a/debuggerd/libdebuggerd/backtrace.cpp
+++ b/debuggerd/libdebuggerd/backtrace.cpp
@@ -27,7 +27,6 @@
 #include <string.h>
 #include <sys/ptrace.h>
 #include <sys/types.h>
-#include <time.h>
 #include <unistd.h>
 
 #include <map>
@@ -40,14 +39,10 @@
 
 #include "libdebuggerd/types.h"
 #include "libdebuggerd/utility.h"
+#include "util.h"
 
 static void dump_process_header(log_t* log, pid_t pid, const char* process_name) {
-  time_t t = time(NULL);
-  struct tm tm;
-  localtime_r(&t, &tm);
-  char timestr[64];
-  strftime(timestr, sizeof(timestr), "%F %T", &tm);
-  _LOG(log, logtype::BACKTRACE, "\n\n----- pid %d at %s -----\n", pid, timestr);
+  _LOG(log, logtype::BACKTRACE, "\n\n----- pid %d at %s -----\n", pid, get_timestamp().c_str());
 
   if (process_name) {
     _LOG(log, logtype::BACKTRACE, "Cmd line: %s\n", process_name);
@@ -106,9 +101,8 @@
   log.tfd = output_fd;
   log.amfd_data = nullptr;
 
-  char process_name[128];
-  read_with_default("/proc/self/cmdline", process_name, sizeof(process_name), "<unknown>");
-  dump_process_header(&log, getpid(), process_name);
+  pid_t pid = getpid();
+  dump_process_header(&log, pid, get_process_name(pid).c_str());
 }
 
 void dump_backtrace_footer(int output_fd) {
diff --git a/debuggerd/libdebuggerd/include/libdebuggerd/utility.h b/debuggerd/libdebuggerd/include/libdebuggerd/utility.h
index 7bfcf5d..76155b1 100644
--- a/debuggerd/libdebuggerd/include/libdebuggerd/utility.h
+++ b/debuggerd/libdebuggerd/include/libdebuggerd/utility.h
@@ -83,8 +83,6 @@
 
 void dump_memory(log_t* log, unwindstack::Memory* backtrace, uint64_t addr, const std::string&);
 
-void read_with_default(const char* path, char* buf, size_t len, const char* default_value);
-
 void drop_capabilities();
 
 bool signal_has_sender(const siginfo_t*, pid_t caller_pid);
diff --git a/debuggerd/libdebuggerd/test/dump_memory_test.cpp b/debuggerd/libdebuggerd/test/dump_memory_test.cpp
index be39582..f16f578 100644
--- a/debuggerd/libdebuggerd/test/dump_memory_test.cpp
+++ b/debuggerd/libdebuggerd/test/dump_memory_test.cpp
@@ -30,39 +30,39 @@
 const char g_expected_full_dump[] =
 "\nmemory near r1:\n"
 #if defined(__LP64__)
-"    0000000012345658 0706050403020100 0f0e0d0c0b0a0908  ................\n"
-"    0000000012345668 1716151413121110 1f1e1d1c1b1a1918  ................\n"
-"    0000000012345678 2726252423222120 2f2e2d2c2b2a2928   !\"#$%&'()*+,-./\n"
-"    0000000012345688 3736353433323130 3f3e3d3c3b3a3938  0123456789:;<=>?\n"
-"    0000000012345698 4746454443424140 4f4e4d4c4b4a4948  @ABCDEFGHIJKLMNO\n"
-"    00000000123456a8 5756555453525150 5f5e5d5c5b5a5958  PQRSTUVWXYZ[\\]^_\n"
-"    00000000123456b8 6766656463626160 6f6e6d6c6b6a6968  `abcdefghijklmno\n"
-"    00000000123456c8 7776757473727170 7f7e7d7c7b7a7978  pqrstuvwxyz{|}~.\n"
-"    00000000123456d8 8786858483828180 8f8e8d8c8b8a8988  ................\n"
-"    00000000123456e8 9796959493929190 9f9e9d9c9b9a9998  ................\n"
-"    00000000123456f8 a7a6a5a4a3a2a1a0 afaeadacabaaa9a8  ................\n"
-"    0000000012345708 b7b6b5b4b3b2b1b0 bfbebdbcbbbab9b8  ................\n"
-"    0000000012345718 c7c6c5c4c3c2c1c0 cfcecdcccbcac9c8  ................\n"
-"    0000000012345728 d7d6d5d4d3d2d1d0 dfdedddcdbdad9d8  ................\n"
-"    0000000012345738 e7e6e5e4e3e2e1e0 efeeedecebeae9e8  ................\n"
-"    0000000012345748 f7f6f5f4f3f2f1f0 fffefdfcfbfaf9f8  ................\n";
+"    0000000012345650 0706050403020100 0f0e0d0c0b0a0908  ................\n"
+"    0000000012345660 1716151413121110 1f1e1d1c1b1a1918  ................\n"
+"    0000000012345670 2726252423222120 2f2e2d2c2b2a2928   !\"#$%&'()*+,-./\n"
+"    0000000012345680 3736353433323130 3f3e3d3c3b3a3938  0123456789:;<=>?\n"
+"    0000000012345690 4746454443424140 4f4e4d4c4b4a4948  @ABCDEFGHIJKLMNO\n"
+"    00000000123456a0 5756555453525150 5f5e5d5c5b5a5958  PQRSTUVWXYZ[\\]^_\n"
+"    00000000123456b0 6766656463626160 6f6e6d6c6b6a6968  `abcdefghijklmno\n"
+"    00000000123456c0 7776757473727170 7f7e7d7c7b7a7978  pqrstuvwxyz{|}~.\n"
+"    00000000123456d0 8786858483828180 8f8e8d8c8b8a8988  ................\n"
+"    00000000123456e0 9796959493929190 9f9e9d9c9b9a9998  ................\n"
+"    00000000123456f0 a7a6a5a4a3a2a1a0 afaeadacabaaa9a8  ................\n"
+"    0000000012345700 b7b6b5b4b3b2b1b0 bfbebdbcbbbab9b8  ................\n"
+"    0000000012345710 c7c6c5c4c3c2c1c0 cfcecdcccbcac9c8  ................\n"
+"    0000000012345720 d7d6d5d4d3d2d1d0 dfdedddcdbdad9d8  ................\n"
+"    0000000012345730 e7e6e5e4e3e2e1e0 efeeedecebeae9e8  ................\n"
+"    0000000012345740 f7f6f5f4f3f2f1f0 fffefdfcfbfaf9f8  ................\n";
 #else
-"    12345658 03020100 07060504 0b0a0908 0f0e0d0c  ................\n"
-"    12345668 13121110 17161514 1b1a1918 1f1e1d1c  ................\n"
-"    12345678 23222120 27262524 2b2a2928 2f2e2d2c   !\"#$%&'()*+,-./\n"
-"    12345688 33323130 37363534 3b3a3938 3f3e3d3c  0123456789:;<=>?\n"
-"    12345698 43424140 47464544 4b4a4948 4f4e4d4c  @ABCDEFGHIJKLMNO\n"
-"    123456a8 53525150 57565554 5b5a5958 5f5e5d5c  PQRSTUVWXYZ[\\]^_\n"
-"    123456b8 63626160 67666564 6b6a6968 6f6e6d6c  `abcdefghijklmno\n"
-"    123456c8 73727170 77767574 7b7a7978 7f7e7d7c  pqrstuvwxyz{|}~.\n"
-"    123456d8 83828180 87868584 8b8a8988 8f8e8d8c  ................\n"
-"    123456e8 93929190 97969594 9b9a9998 9f9e9d9c  ................\n"
-"    123456f8 a3a2a1a0 a7a6a5a4 abaaa9a8 afaeadac  ................\n"
-"    12345708 b3b2b1b0 b7b6b5b4 bbbab9b8 bfbebdbc  ................\n"
-"    12345718 c3c2c1c0 c7c6c5c4 cbcac9c8 cfcecdcc  ................\n"
-"    12345728 d3d2d1d0 d7d6d5d4 dbdad9d8 dfdedddc  ................\n"
-"    12345738 e3e2e1e0 e7e6e5e4 ebeae9e8 efeeedec  ................\n"
-"    12345748 f3f2f1f0 f7f6f5f4 fbfaf9f8 fffefdfc  ................\n";
+"    12345650 03020100 07060504 0b0a0908 0f0e0d0c  ................\n"
+"    12345660 13121110 17161514 1b1a1918 1f1e1d1c  ................\n"
+"    12345670 23222120 27262524 2b2a2928 2f2e2d2c   !\"#$%&'()*+,-./\n"
+"    12345680 33323130 37363534 3b3a3938 3f3e3d3c  0123456789:;<=>?\n"
+"    12345690 43424140 47464544 4b4a4948 4f4e4d4c  @ABCDEFGHIJKLMNO\n"
+"    123456a0 53525150 57565554 5b5a5958 5f5e5d5c  PQRSTUVWXYZ[\\]^_\n"
+"    123456b0 63626160 67666564 6b6a6968 6f6e6d6c  `abcdefghijklmno\n"
+"    123456c0 73727170 77767574 7b7a7978 7f7e7d7c  pqrstuvwxyz{|}~.\n"
+"    123456d0 83828180 87868584 8b8a8988 8f8e8d8c  ................\n"
+"    123456e0 93929190 97969594 9b9a9998 9f9e9d9c  ................\n"
+"    123456f0 a3a2a1a0 a7a6a5a4 abaaa9a8 afaeadac  ................\n"
+"    12345700 b3b2b1b0 b7b6b5b4 bbbab9b8 bfbebdbc  ................\n"
+"    12345710 c3c2c1c0 c7c6c5c4 cbcac9c8 cfcecdcc  ................\n"
+"    12345720 d3d2d1d0 d7d6d5d4 dbdad9d8 dfdedddc  ................\n"
+"    12345730 e3e2e1e0 e7e6e5e4 ebeae9e8 efeeedec  ................\n"
+"    12345740 f3f2f1f0 f7f6f5f4 fbfaf9f8 fffefdfc  ................\n";
 #endif
 
 const char g_expected_partial_dump[] = \
@@ -112,7 +112,10 @@
     if (last_read_addr_ > 0) {
       offset = addr - last_read_addr_;
     }
-    size_t bytes_available = buffer_.size() - offset;
+    size_t bytes_available = 0;
+    if (offset < buffer_.size()) {
+      bytes_available = buffer_.size() - offset;
+    }
 
     if (partial_read_) {
       bytes = std::min(bytes, bytes_partial_read_);
@@ -258,44 +261,7 @@
   std::string tombstone_contents;
   ASSERT_TRUE(lseek(log_.tfd, 0, SEEK_SET) == 0);
   ASSERT_TRUE(android::base::ReadFdToString(log_.tfd, &tombstone_contents));
-  const char* expected_dump = \
-"\nmemory near pc:\n"
-#if defined(__LP64__)
-"    00000000a2345658 ---------------- ----------------  ................\n"
-"    00000000a2345668 ---------------- ----------------  ................\n"
-"    00000000a2345678 ---------------- ----------------  ................\n"
-"    00000000a2345688 ---------------- ----------------  ................\n"
-"    00000000a2345698 ---------------- ----------------  ................\n"
-"    00000000a23456a8 ---------------- ----------------  ................\n"
-"    00000000a23456b8 ---------------- ----------------  ................\n"
-"    00000000a23456c8 ---------------- ----------------  ................\n"
-"    00000000a23456d8 ---------------- ----------------  ................\n"
-"    00000000a23456e8 ---------------- ----------------  ................\n"
-"    00000000a23456f8 ---------------- ----------------  ................\n"
-"    00000000a2345708 ---------------- ----------------  ................\n"
-"    00000000a2345718 ---------------- ----------------  ................\n"
-"    00000000a2345728 ---------------- ----------------  ................\n"
-"    00000000a2345738 ---------------- ----------------  ................\n"
-"    00000000a2345748 ---------------- ----------------  ................\n";
-#else
-"    a2345658 -------- -------- -------- --------  ................\n"
-"    a2345668 -------- -------- -------- --------  ................\n"
-"    a2345678 -------- -------- -------- --------  ................\n"
-"    a2345688 -------- -------- -------- --------  ................\n"
-"    a2345698 -------- -------- -------- --------  ................\n"
-"    a23456a8 -------- -------- -------- --------  ................\n"
-"    a23456b8 -------- -------- -------- --------  ................\n"
-"    a23456c8 -------- -------- -------- --------  ................\n"
-"    a23456d8 -------- -------- -------- --------  ................\n"
-"    a23456e8 -------- -------- -------- --------  ................\n"
-"    a23456f8 -------- -------- -------- --------  ................\n"
-"    a2345708 -------- -------- -------- --------  ................\n"
-"    a2345718 -------- -------- -------- --------  ................\n"
-"    a2345728 -------- -------- -------- --------  ................\n"
-"    a2345738 -------- -------- -------- --------  ................\n"
-"    a2345748 -------- -------- -------- --------  ................\n";
-#endif
-  ASSERT_STREQ(expected_dump, tombstone_contents.c_str());
+  ASSERT_STREQ("", tombstone_contents.c_str());
 
   // Verify that the log buf is empty, and no error messages.
   ASSERT_STREQ("", getFakeLogBuf().c_str());
@@ -429,57 +395,17 @@
   ASSERT_STREQ("", getFakeLogPrint().c_str());
 }
 
-TEST_F(DumpMemoryTest, memory_address_too_low) {
-  uint8_t buffer[256];
-  memset(buffer, 0, sizeof(buffer));
-  memory_mock_->SetReadData(buffer, sizeof(buffer));
-
-  dump_memory(&log_, memory_mock_.get(), 0, "memory near r1");
-
-  std::string tombstone_contents;
-  ASSERT_TRUE(lseek(log_.tfd, 0, SEEK_SET) == 0);
-  ASSERT_TRUE(android::base::ReadFdToString(log_.tfd, &tombstone_contents));
-  ASSERT_STREQ("", tombstone_contents.c_str());
-
-  // Verify that the log buf is empty, and no error messages.
-  ASSERT_STREQ("", getFakeLogBuf().c_str());
-  ASSERT_STREQ("", getFakeLogPrint().c_str());
-}
-
 TEST_F(DumpMemoryTest, memory_address_too_high) {
   uint8_t buffer[256];
   memset(buffer, 0, sizeof(buffer));
   memory_mock_->SetReadData(buffer, sizeof(buffer));
 
 #if defined(__LP64__)
-  dump_memory(&log_, memory_mock_.get(), 0x4000000000000000UL, "memory near r1");
-  dump_memory(&log_, memory_mock_.get(), 0x4000000000000000UL - 32, "memory near r1");
-  dump_memory(&log_, memory_mock_.get(), 0x4000000000000000UL - 216, "memory near r1");
+  dump_memory(&log_, memory_mock_.get(), -32, "memory near r1");
+  dump_memory(&log_, memory_mock_.get(), -208, "memory near r1");
 #else
-  dump_memory(&log_, memory_mock_.get(), 0xffff0000, "memory near r1");
-  dump_memory(&log_, memory_mock_.get(), 0xffff0000 - 32, "memory near r1");
-  dump_memory(&log_, memory_mock_.get(), 0xffff0000 - 220, "memory near r1");
-#endif
-
-  std::string tombstone_contents;
-  ASSERT_TRUE(lseek(log_.tfd, 0, SEEK_SET) == 0);
-  ASSERT_TRUE(android::base::ReadFdToString(log_.tfd, &tombstone_contents));
-  ASSERT_STREQ("", tombstone_contents.c_str());
-
-  // Verify that the log buf is empty, and no error messages.
-  ASSERT_STREQ("", getFakeLogBuf().c_str());
-  ASSERT_STREQ("", getFakeLogPrint().c_str());
-}
-
-TEST_F(DumpMemoryTest, memory_address_would_overflow) {
-  uint8_t buffer[256];
-  memset(buffer, 0, sizeof(buffer));
-  memory_mock_->SetReadData(buffer, sizeof(buffer));
-
-#if defined(__LP64__)
-  dump_memory(&log_, memory_mock_.get(), 0xfffffffffffffff0, "memory near r1");
-#else
-  dump_memory(&log_, memory_mock_.get(), 0xfffffff0, "memory near r1");
+  dump_memory(&log_, memory_mock_.get(), 0x100000000 - 32, "memory near r1");
+  dump_memory(&log_, memory_mock_.get(), 0x100000000 - 208, "memory near r1");
 #endif
 
   std::string tombstone_contents;
@@ -500,9 +426,9 @@
   memory_mock_->SetReadData(buffer, sizeof(buffer));
 
 #if defined(__LP64__)
-  dump_memory(&log_, memory_mock_.get(), 0x4000000000000000UL - 224, "memory near r4");
+  dump_memory(&log_, memory_mock_.get(), -224, "memory near r4");
 #else
-  dump_memory(&log_, memory_mock_.get(), 0xffff0000 - 224, "memory near r4");
+  dump_memory(&log_, memory_mock_.get(), 0x100000000 - 224, "memory near r4");
 #endif
 
   std::string tombstone_contents;
@@ -510,40 +436,57 @@
   ASSERT_TRUE(android::base::ReadFdToString(log_.tfd, &tombstone_contents));
   const char* expected_dump = \
 "\nmemory near r4:\n"
-#if defined(__LP64__)
-"    3fffffffffffff00 0706050403020100 0f0e0d0c0b0a0908  ................\n"
-"    3fffffffffffff10 1716151413121110 1f1e1d1c1b1a1918  ................\n"
-"    3fffffffffffff20 2726252423222120 2f2e2d2c2b2a2928   !\"#$%&'()*+,-./\n"
-"    3fffffffffffff30 3736353433323130 3f3e3d3c3b3a3938  0123456789:;<=>?\n"
-"    3fffffffffffff40 4746454443424140 4f4e4d4c4b4a4948  @ABCDEFGHIJKLMNO\n"
-"    3fffffffffffff50 5756555453525150 5f5e5d5c5b5a5958  PQRSTUVWXYZ[\\]^_\n"
-"    3fffffffffffff60 6766656463626160 6f6e6d6c6b6a6968  `abcdefghijklmno\n"
-"    3fffffffffffff70 7776757473727170 7f7e7d7c7b7a7978  pqrstuvwxyz{|}~.\n"
-"    3fffffffffffff80 8786858483828180 8f8e8d8c8b8a8988  ................\n"
-"    3fffffffffffff90 9796959493929190 9f9e9d9c9b9a9998  ................\n"
-"    3fffffffffffffa0 a7a6a5a4a3a2a1a0 afaeadacabaaa9a8  ................\n"
-"    3fffffffffffffb0 b7b6b5b4b3b2b1b0 bfbebdbcbbbab9b8  ................\n"
-"    3fffffffffffffc0 c7c6c5c4c3c2c1c0 cfcecdcccbcac9c8  ................\n"
-"    3fffffffffffffd0 d7d6d5d4d3d2d1d0 dfdedddcdbdad9d8  ................\n"
-"    3fffffffffffffe0 e7e6e5e4e3e2e1e0 efeeedecebeae9e8  ................\n"
-"    3ffffffffffffff0 f7f6f5f4f3f2f1f0 fffefdfcfbfaf9f8  ................\n";
+#if defined(__aarch64__)
+"    00ffffffffffff00 0706050403020100 0f0e0d0c0b0a0908  ................\n"
+"    00ffffffffffff10 1716151413121110 1f1e1d1c1b1a1918  ................\n"
+"    00ffffffffffff20 2726252423222120 2f2e2d2c2b2a2928   !\"#$%&'()*+,-./\n"
+"    00ffffffffffff30 3736353433323130 3f3e3d3c3b3a3938  0123456789:;<=>?\n"
+"    00ffffffffffff40 4746454443424140 4f4e4d4c4b4a4948  @ABCDEFGHIJKLMNO\n"
+"    00ffffffffffff50 5756555453525150 5f5e5d5c5b5a5958  PQRSTUVWXYZ[\\]^_\n"
+"    00ffffffffffff60 6766656463626160 6f6e6d6c6b6a6968  `abcdefghijklmno\n"
+"    00ffffffffffff70 7776757473727170 7f7e7d7c7b7a7978  pqrstuvwxyz{|}~.\n"
+"    00ffffffffffff80 8786858483828180 8f8e8d8c8b8a8988  ................\n"
+"    00ffffffffffff90 9796959493929190 9f9e9d9c9b9a9998  ................\n"
+"    00ffffffffffffa0 a7a6a5a4a3a2a1a0 afaeadacabaaa9a8  ................\n"
+"    00ffffffffffffb0 b7b6b5b4b3b2b1b0 bfbebdbcbbbab9b8  ................\n"
+"    00ffffffffffffc0 c7c6c5c4c3c2c1c0 cfcecdcccbcac9c8  ................\n"
+"    00ffffffffffffd0 d7d6d5d4d3d2d1d0 dfdedddcdbdad9d8  ................\n"
+"    00ffffffffffffe0 e7e6e5e4e3e2e1e0 efeeedecebeae9e8  ................\n"
+"    00fffffffffffff0 f7f6f5f4f3f2f1f0 fffefdfcfbfaf9f8  ................\n";
+#elif defined(__LP64__)
+"    ffffffffffffff00 0706050403020100 0f0e0d0c0b0a0908  ................\n"
+"    ffffffffffffff10 1716151413121110 1f1e1d1c1b1a1918  ................\n"
+"    ffffffffffffff20 2726252423222120 2f2e2d2c2b2a2928   !\"#$%&'()*+,-./\n"
+"    ffffffffffffff30 3736353433323130 3f3e3d3c3b3a3938  0123456789:;<=>?\n"
+"    ffffffffffffff40 4746454443424140 4f4e4d4c4b4a4948  @ABCDEFGHIJKLMNO\n"
+"    ffffffffffffff50 5756555453525150 5f5e5d5c5b5a5958  PQRSTUVWXYZ[\\]^_\n"
+"    ffffffffffffff60 6766656463626160 6f6e6d6c6b6a6968  `abcdefghijklmno\n"
+"    ffffffffffffff70 7776757473727170 7f7e7d7c7b7a7978  pqrstuvwxyz{|}~.\n"
+"    ffffffffffffff80 8786858483828180 8f8e8d8c8b8a8988  ................\n"
+"    ffffffffffffff90 9796959493929190 9f9e9d9c9b9a9998  ................\n"
+"    ffffffffffffffa0 a7a6a5a4a3a2a1a0 afaeadacabaaa9a8  ................\n"
+"    ffffffffffffffb0 b7b6b5b4b3b2b1b0 bfbebdbcbbbab9b8  ................\n"
+"    ffffffffffffffc0 c7c6c5c4c3c2c1c0 cfcecdcccbcac9c8  ................\n"
+"    ffffffffffffffd0 d7d6d5d4d3d2d1d0 dfdedddcdbdad9d8  ................\n"
+"    ffffffffffffffe0 e7e6e5e4e3e2e1e0 efeeedecebeae9e8  ................\n"
+"    fffffffffffffff0 f7f6f5f4f3f2f1f0 fffefdfcfbfaf9f8  ................\n";
 #else
-"    fffeff00 03020100 07060504 0b0a0908 0f0e0d0c  ................\n"
-"    fffeff10 13121110 17161514 1b1a1918 1f1e1d1c  ................\n"
-"    fffeff20 23222120 27262524 2b2a2928 2f2e2d2c   !\"#$%&'()*+,-./\n"
-"    fffeff30 33323130 37363534 3b3a3938 3f3e3d3c  0123456789:;<=>?\n"
-"    fffeff40 43424140 47464544 4b4a4948 4f4e4d4c  @ABCDEFGHIJKLMNO\n"
-"    fffeff50 53525150 57565554 5b5a5958 5f5e5d5c  PQRSTUVWXYZ[\\]^_\n"
-"    fffeff60 63626160 67666564 6b6a6968 6f6e6d6c  `abcdefghijklmno\n"
-"    fffeff70 73727170 77767574 7b7a7978 7f7e7d7c  pqrstuvwxyz{|}~.\n"
-"    fffeff80 83828180 87868584 8b8a8988 8f8e8d8c  ................\n"
-"    fffeff90 93929190 97969594 9b9a9998 9f9e9d9c  ................\n"
-"    fffeffa0 a3a2a1a0 a7a6a5a4 abaaa9a8 afaeadac  ................\n"
-"    fffeffb0 b3b2b1b0 b7b6b5b4 bbbab9b8 bfbebdbc  ................\n"
-"    fffeffc0 c3c2c1c0 c7c6c5c4 cbcac9c8 cfcecdcc  ................\n"
-"    fffeffd0 d3d2d1d0 d7d6d5d4 dbdad9d8 dfdedddc  ................\n"
-"    fffeffe0 e3e2e1e0 e7e6e5e4 ebeae9e8 efeeedec  ................\n"
-"    fffefff0 f3f2f1f0 f7f6f5f4 fbfaf9f8 fffefdfc  ................\n";
+"    ffffff00 03020100 07060504 0b0a0908 0f0e0d0c  ................\n"
+"    ffffff10 13121110 17161514 1b1a1918 1f1e1d1c  ................\n"
+"    ffffff20 23222120 27262524 2b2a2928 2f2e2d2c   !\"#$%&'()*+,-./\n"
+"    ffffff30 33323130 37363534 3b3a3938 3f3e3d3c  0123456789:;<=>?\n"
+"    ffffff40 43424140 47464544 4b4a4948 4f4e4d4c  @ABCDEFGHIJKLMNO\n"
+"    ffffff50 53525150 57565554 5b5a5958 5f5e5d5c  PQRSTUVWXYZ[\\]^_\n"
+"    ffffff60 63626160 67666564 6b6a6968 6f6e6d6c  `abcdefghijklmno\n"
+"    ffffff70 73727170 77767574 7b7a7978 7f7e7d7c  pqrstuvwxyz{|}~.\n"
+"    ffffff80 83828180 87868584 8b8a8988 8f8e8d8c  ................\n"
+"    ffffff90 93929190 97969594 9b9a9998 9f9e9d9c  ................\n"
+"    ffffffa0 a3a2a1a0 a7a6a5a4 abaaa9a8 afaeadac  ................\n"
+"    ffffffb0 b3b2b1b0 b7b6b5b4 bbbab9b8 bfbebdbc  ................\n"
+"    ffffffc0 c3c2c1c0 c7c6c5c4 cbcac9c8 cfcecdcc  ................\n"
+"    ffffffd0 d3d2d1d0 d7d6d5d4 dbdad9d8 dfdedddc  ................\n"
+"    ffffffe0 e3e2e1e0 e7e6e5e4 ebeae9e8 efeeedec  ................\n"
+"    fffffff0 f3f2f1f0 f7f6f5f4 fbfaf9f8 fffefdfc  ................\n";
 #endif
   ASSERT_STREQ(expected_dump, tombstone_contents.c_str());
 
@@ -570,39 +513,41 @@
   const char* expected_dump = \
 "\nmemory near r4:\n"
 #if defined(__LP64__)
-"    0000000010000f88 ---------------- ----------------  ................\n"
-"    0000000010000f98 ---------------- ----------------  ................\n"
-"    0000000010000fa8 ---------------- ----------------  ................\n"
-"    0000000010000fb8 ---------------- ----------------  ................\n"
-"    0000000010000fc8 ---------------- ----------------  ................\n"
-"    0000000010000fd8 ---------------- ----------------  ................\n"
-"    0000000010000fe8 ---------------- ----------------  ................\n"
-"    0000000010000ff8 ---------------- 7f7e7d7c7b7a7978  ........xyz{|}~.\n"
-"    0000000010001008 8786858483828180 8f8e8d8c8b8a8988  ................\n"
-"    0000000010001018 9796959493929190 9f9e9d9c9b9a9998  ................\n"
-"    0000000010001028 a7a6a5a4a3a2a1a0 afaeadacabaaa9a8  ................\n"
-"    0000000010001038 b7b6b5b4b3b2b1b0 bfbebdbcbbbab9b8  ................\n"
-"    0000000010001048 c7c6c5c4c3c2c1c0 cfcecdcccbcac9c8  ................\n"
-"    0000000010001058 d7d6d5d4d3d2d1d0 dfdedddcdbdad9d8  ................\n"
-"    0000000010001068 e7e6e5e4e3e2e1e0 efeeedecebeae9e8  ................\n"
-"    0000000010001078 f7f6f5f4f3f2f1f0 fffefdfcfbfaf9f8  ................\n";
+R"(    0000000010000f80 ---------------- ----------------  ................
+    0000000010000f90 ---------------- ----------------  ................
+    0000000010000fa0 ---------------- ----------------  ................
+    0000000010000fb0 ---------------- ----------------  ................
+    0000000010000fc0 ---------------- ----------------  ................
+    0000000010000fd0 ---------------- ----------------  ................
+    0000000010000fe0 ---------------- ----------------  ................
+    0000000010000ff0 ---------------- ----------------  ................
+    0000000010001000 8786858483828180 8f8e8d8c8b8a8988  ................
+    0000000010001010 9796959493929190 9f9e9d9c9b9a9998  ................
+    0000000010001020 a7a6a5a4a3a2a1a0 afaeadacabaaa9a8  ................
+    0000000010001030 b7b6b5b4b3b2b1b0 bfbebdbcbbbab9b8  ................
+    0000000010001040 c7c6c5c4c3c2c1c0 cfcecdcccbcac9c8  ................
+    0000000010001050 d7d6d5d4d3d2d1d0 dfdedddcdbdad9d8  ................
+    0000000010001060 e7e6e5e4e3e2e1e0 efeeedecebeae9e8  ................
+    0000000010001070 f7f6f5f4f3f2f1f0 fffefdfcfbfaf9f8  ................
+)";
 #else
-"    10000f88 -------- -------- -------- --------  ................\n"
-"    10000f98 -------- -------- -------- --------  ................\n"
-"    10000fa8 -------- -------- -------- --------  ................\n"
-"    10000fb8 -------- -------- -------- --------  ................\n"
-"    10000fc8 -------- -------- -------- --------  ................\n"
-"    10000fd8 -------- -------- -------- --------  ................\n"
-"    10000fe8 -------- -------- -------- --------  ................\n"
-"    10000ff8 -------- -------- 7b7a7978 7f7e7d7c  ........xyz{|}~.\n"
-"    10001008 83828180 87868584 8b8a8988 8f8e8d8c  ................\n"
-"    10001018 93929190 97969594 9b9a9998 9f9e9d9c  ................\n"
-"    10001028 a3a2a1a0 a7a6a5a4 abaaa9a8 afaeadac  ................\n"
-"    10001038 b3b2b1b0 b7b6b5b4 bbbab9b8 bfbebdbc  ................\n"
-"    10001048 c3c2c1c0 c7c6c5c4 cbcac9c8 cfcecdcc  ................\n"
-"    10001058 d3d2d1d0 d7d6d5d4 dbdad9d8 dfdedddc  ................\n"
-"    10001068 e3e2e1e0 e7e6e5e4 ebeae9e8 efeeedec  ................\n"
-"    10001078 f3f2f1f0 f7f6f5f4 fbfaf9f8 fffefdfc  ................\n";
+R"(    10000f80 -------- -------- -------- --------  ................
+    10000f90 -------- -------- -------- --------  ................
+    10000fa0 -------- -------- -------- --------  ................
+    10000fb0 -------- -------- -------- --------  ................
+    10000fc0 -------- -------- -------- --------  ................
+    10000fd0 -------- -------- -------- --------  ................
+    10000fe0 -------- -------- -------- --------  ................
+    10000ff0 -------- -------- -------- --------  ................
+    10001000 83828180 87868584 8b8a8988 8f8e8d8c  ................
+    10001010 93929190 97969594 9b9a9998 9f9e9d9c  ................
+    10001020 a3a2a1a0 a7a6a5a4 abaaa9a8 afaeadac  ................
+    10001030 b3b2b1b0 b7b6b5b4 bbbab9b8 bfbebdbc  ................
+    10001040 c3c2c1c0 c7c6c5c4 cbcac9c8 cfcecdcc  ................
+    10001050 d3d2d1d0 d7d6d5d4 dbdad9d8 dfdedddc  ................
+    10001060 e3e2e1e0 e7e6e5e4 ebeae9e8 efeeedec  ................
+    10001070 f3f2f1f0 f7f6f5f4 fbfaf9f8 fffefdfc  ................
+)";
 #endif
   ASSERT_STREQ(expected_dump, tombstone_contents.c_str());
 
@@ -684,44 +629,7 @@
   std::string tombstone_contents;
   ASSERT_TRUE(lseek(log_.tfd, 0, SEEK_SET) == 0);
   ASSERT_TRUE(android::base::ReadFdToString(log_.tfd, &tombstone_contents));
-  const char* expected_dump = \
-"\nmemory near r4:\n"
-#if defined(__LP64__)
-"    0000000010000000 ---------------- ----------------  ................\n"
-"    0000000010000010 ---------------- ----------------  ................\n"
-"    0000000010000020 ---------------- ----------------  ................\n"
-"    0000000010000030 ---------------- ----------------  ................\n"
-"    0000000010000040 ---------------- ----------------  ................\n"
-"    0000000010000050 ---------------- ----------------  ................\n"
-"    0000000010000060 ---------------- ----------------  ................\n"
-"    0000000010000070 ---------------- ----------------  ................\n"
-"    0000000010000080 ---------------- ----------------  ................\n"
-"    0000000010000090 ---------------- ----------------  ................\n"
-"    00000000100000a0 ---------------- ----------------  ................\n"
-"    00000000100000b0 ---------------- ----------------  ................\n"
-"    00000000100000c0 ---------------- ----------------  ................\n"
-"    00000000100000d0 ---------------- ----------------  ................\n"
-"    00000000100000e0 ---------------- ----------------  ................\n"
-"    00000000100000f0 ---------------- ----------------  ................\n";
-#else
-"    10000000 -------- -------- -------- --------  ................\n"
-"    10000010 -------- -------- -------- --------  ................\n"
-"    10000020 -------- -------- -------- --------  ................\n"
-"    10000030 -------- -------- -------- --------  ................\n"
-"    10000040 -------- -------- -------- --------  ................\n"
-"    10000050 -------- -------- -------- --------  ................\n"
-"    10000060 -------- -------- -------- --------  ................\n"
-"    10000070 -------- -------- -------- --------  ................\n"
-"    10000080 -------- -------- -------- --------  ................\n"
-"    10000090 -------- -------- -------- --------  ................\n"
-"    100000a0 -------- -------- -------- --------  ................\n"
-"    100000b0 -------- -------- -------- --------  ................\n"
-"    100000c0 -------- -------- -------- --------  ................\n"
-"    100000d0 -------- -------- -------- --------  ................\n"
-"    100000e0 -------- -------- -------- --------  ................\n"
-"    100000f0 -------- -------- -------- --------  ................\n";
-#endif
-  ASSERT_STREQ(expected_dump, tombstone_contents.c_str());
+  ASSERT_STREQ("", tombstone_contents.c_str());
 
   // Verify that the log buf is empty, and no error messages.
   ASSERT_STREQ("", getFakeLogBuf().c_str());
@@ -744,44 +652,7 @@
   std::string tombstone_contents;
   ASSERT_TRUE(lseek(log_.tfd, 0, SEEK_SET) == 0);
   ASSERT_TRUE(android::base::ReadFdToString(log_.tfd, &tombstone_contents));
-  const char* expected_dump = \
-"\nmemory near r4:\n"
-#if defined(__LP64__)
-"    0000000010000f00 ---------------- ----------------  ................\n"
-"    0000000010000f10 ---------------- ----------------  ................\n"
-"    0000000010000f20 ---------------- ----------------  ................\n"
-"    0000000010000f30 ---------------- ----------------  ................\n"
-"    0000000010000f40 ---------------- ----------------  ................\n"
-"    0000000010000f50 ---------------- ----------------  ................\n"
-"    0000000010000f60 ---------------- ----------------  ................\n"
-"    0000000010000f70 ---------------- ----------------  ................\n"
-"    0000000010000f80 ---------------- ----------------  ................\n"
-"    0000000010000f90 ---------------- ----------------  ................\n"
-"    0000000010000fa0 ---------------- ----------------  ................\n"
-"    0000000010000fb0 ---------------- ----------------  ................\n"
-"    0000000010000fc0 ---------------- ----------------  ................\n"
-"    0000000010000fd0 ---------------- ----------------  ................\n"
-"    0000000010000fe0 ---------------- ----------------  ................\n"
-"    0000000010000ff0 ---------------- ----------------  ................\n";
-#else
-"    10000f00 -------- -------- -------- --------  ................\n"
-"    10000f10 -------- -------- -------- --------  ................\n"
-"    10000f20 -------- -------- -------- --------  ................\n"
-"    10000f30 -------- -------- -------- --------  ................\n"
-"    10000f40 -------- -------- -------- --------  ................\n"
-"    10000f50 -------- -------- -------- --------  ................\n"
-"    10000f60 -------- -------- -------- --------  ................\n"
-"    10000f70 -------- -------- -------- --------  ................\n"
-"    10000f80 -------- -------- -------- --------  ................\n"
-"    10000f90 -------- -------- -------- --------  ................\n"
-"    10000fa0 -------- -------- -------- --------  ................\n"
-"    10000fb0 -------- -------- -------- --------  ................\n"
-"    10000fc0 -------- -------- -------- --------  ................\n"
-"    10000fd0 -------- -------- -------- --------  ................\n"
-"    10000fe0 -------- -------- -------- --------  ................\n"
-"    10000ff0 -------- -------- -------- --------  ................\n";
-#endif
-  ASSERT_STREQ(expected_dump, tombstone_contents.c_str());
+  ASSERT_STREQ("", tombstone_contents.c_str());
 
   // Verify that the log buf is empty, and no error messages.
   ASSERT_STREQ("", getFakeLogBuf().c_str());
diff --git a/debuggerd/libdebuggerd/test/tombstone_test.cpp b/debuggerd/libdebuggerd/test/tombstone_test.cpp
index aec8c60..b42d70c 100644
--- a/debuggerd/libdebuggerd/test/tombstone_test.cpp
+++ b/debuggerd/libdebuggerd/test/tombstone_test.cpp
@@ -359,13 +359,6 @@
   ASSERT_STREQ(expected.c_str(), amfd_data_.c_str());
 }
 
-TEST_F(TombstoneTest, dump_timestamp) {
-  setenv("TZ", "UTC", 1);
-  tzset();
-  dump_timestamp(&log_, 0);
-  ASSERT_STREQ("Timestamp: 1970-01-01 00:00:00+0000\n", amfd_data_.c_str());
-}
-
 class GwpAsanCrashDataTest : public GwpAsanCrashData {
 public:
   GwpAsanCrashDataTest(
diff --git a/debuggerd/libdebuggerd/tombstone.cpp b/debuggerd/libdebuggerd/tombstone.cpp
index ab65dd1..7af99c9 100644
--- a/debuggerd/libdebuggerd/tombstone.cpp
+++ b/debuggerd/libdebuggerd/tombstone.cpp
@@ -58,6 +58,7 @@
 #include "libdebuggerd/open_files_list.h"
 #include "libdebuggerd/scudo.h"
 #include "libdebuggerd/utility.h"
+#include "util.h"
 
 #include "gwp_asan/common.h"
 #include "gwp_asan/crash_handler.h"
@@ -80,15 +81,6 @@
   _LOG(log, logtype::HEADER, "ABI: '%s'\n", ABI_STRING);
 }
 
-static void dump_timestamp(log_t* log, time_t time) {
-  struct tm tm;
-  localtime_r(&time, &tm);
-
-  char buf[strlen("1970-01-01 00:00:00+0830") + 1];
-  strftime(buf, sizeof(buf), "%F %T%z", &tm);
-  _LOG(log, logtype::HEADER, "Timestamp: %s\n", buf);
-}
-
 static std::string get_stack_overflow_cause(uint64_t fault_addr, uint64_t sp,
                                             unwindstack::Maps* maps) {
   static constexpr uint64_t kMaxDifferenceBytes = 256;
@@ -182,12 +174,8 @@
 }
 
 static void dump_thread_info(log_t* log, const ThreadInfo& thread_info) {
-  // Blacklist logd, logd.reader, logd.writer, logd.auditd, logd.control ...
-  // TODO: Why is this controlled by thread name?
-  if (thread_info.thread_name == "logd" ||
-      android::base::StartsWith(thread_info.thread_name, "logd.")) {
-    log->should_retrieve_logcat = false;
-  }
+  // Don't try to collect logs from the threads that implement the logging system itself.
+  if (thread_info.uid == AID_LOGD) log->should_retrieve_logcat = false;
 
   _LOG(log, logtype::HEADER, "pid: %d, tid: %d, name: %s  >>> %s <<<\n", thread_info.pid,
        thread_info.tid, thread_info.thread_name.c_str(), thread_info.process_name.c_str());
@@ -507,10 +495,9 @@
     // (although in this case the pid is redundant).
     char timeBuf[32];
     time_t sec = static_cast<time_t>(log_entry.entry.sec);
-    struct tm tmBuf;
-    struct tm* ptm;
-    ptm = localtime_r(&sec, &tmBuf);
-    strftime(timeBuf, sizeof(timeBuf), "%m-%d %H:%M:%S", ptm);
+    tm tm;
+    localtime_r(&sec, &tm);
+    strftime(timeBuf, sizeof(timeBuf), "%m-%d %H:%M:%S", &tm);
 
     char* msg = log_entry.msg();
     if (msg == nullptr) {
@@ -571,23 +558,20 @@
   log.tfd = tombstone_fd;
   log.amfd_data = nullptr;
 
-  char thread_name[16];
-  char process_name[128];
-
-  read_with_default("/proc/self/comm", thread_name, sizeof(thread_name), "<unknown>");
-  read_with_default("/proc/self/cmdline", process_name, sizeof(process_name), "<unknown>");
+  std::string thread_name = get_thread_name(tid);
+  std::string process_name = get_process_name(pid);
 
   std::unique_ptr<unwindstack::Regs> regs(
       unwindstack::Regs::CreateFromUcontext(unwindstack::Regs::CurrentArch(), ucontext));
 
   std::map<pid_t, ThreadInfo> threads;
-  threads[gettid()] = ThreadInfo{
+  threads[tid] = ThreadInfo{
       .registers = std::move(regs),
       .uid = uid,
       .tid = tid,
-      .thread_name = thread_name,
+      .thread_name = thread_name.c_str(),
       .pid = pid,
-      .process_name = process_name,
+      .process_name = process_name.c_str(),
       .siginfo = siginfo,
   };
 
@@ -606,8 +590,8 @@
                        const std::map<pid_t, ThreadInfo>& threads, pid_t target_thread,
                        const ProcessInfo& process_info, OpenFilesList* open_files,
                        std::string* amfd_data) {
-  // don't copy log messages to tombstone unless this is a dev device
-  bool want_logs = android::base::GetBoolProperty("ro.debuggable", false);
+  // Don't copy log messages to tombstone unless this is a development device.
+  bool want_logs = GetBoolProperty("ro.debuggable", false);
 
   log_t log;
   log.current_tid = target_thread;
@@ -617,7 +601,7 @@
 
   _LOG(&log, logtype::HEADER, "*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***\n");
   dump_header_info(&log);
-  dump_timestamp(&log, time(nullptr));
+  _LOG(&log, logtype::HEADER, "Timestamp: %s\n", get_timestamp().c_str());
 
   auto it = threads.find(target_thread);
   if (it == threads.end()) {
diff --git a/debuggerd/libdebuggerd/utility.cpp b/debuggerd/libdebuggerd/utility.cpp
index c8a3431..4e6df09 100644
--- a/debuggerd/libdebuggerd/utility.cpp
+++ b/debuggerd/libdebuggerd/utility.cpp
@@ -44,7 +44,6 @@
 
 using android::base::unique_fd;
 
-// Whitelist output desired in the logcat output.
 bool is_allowed_in_logcat(enum logtype ltype) {
   if ((ltype == HEADER)
    || (ltype == REGISTERS)
@@ -129,24 +128,23 @@
 #define MEMORY_BYTES_PER_LINE 16
 
 void dump_memory(log_t* log, unwindstack::Memory* memory, uint64_t addr, const std::string& label) {
-  // Align the address to sizeof(long) and start 32 bytes before the address.
-  addr &= ~(sizeof(long) - 1);
+  // Align the address to the number of bytes per line to avoid confusing memory tag output if
+  // memory is tagged and we start from a misaligned address. Start 32 bytes before the address.
+  addr &= ~(MEMORY_BYTES_PER_LINE - 1);
   if (addr >= 4128) {
     addr -= 32;
   }
 
-  // Don't bother if the address looks too low, or looks too high.
-  if (addr < 4096 ||
-#if defined(__LP64__)
-      addr > 0x4000000000000000UL - MEMORY_BYTES_TO_DUMP) {
-#else
-      addr > 0xffff0000 - MEMORY_BYTES_TO_DUMP) {
-#endif
+  // We don't want the address tag to appear in the addresses in the memory dump.
+  addr = untag_address(addr);
+
+  // Don't bother if the address would overflow, taking tag bits into account. Note that
+  // untag_address truncates to 32 bits on 32-bit platforms as a side effect of returning a
+  // uintptr_t, so this also checks for 32-bit overflow.
+  if (untag_address(addr + MEMORY_BYTES_TO_DUMP - 1) < addr) {
     return;
   }
 
-  _LOG(log, logtype::MEMORY, "\n%s:\n", label.c_str());
-
   // Dump 256 bytes
   uintptr_t data[MEMORY_BYTES_TO_DUMP/sizeof(uintptr_t)];
   memset(data, 0, MEMORY_BYTES_TO_DUMP);
@@ -187,6 +185,15 @@
     }
   }
 
+  // If we were unable to read anything, it probably means that the register doesn't contain a
+  // valid pointer. In that case, skip the output for this register entirely rather than emitting 16
+  // lines of dashes.
+  if (bytes == 0) {
+    return;
+  }
+
+  _LOG(log, logtype::MEMORY, "\n%s:\n", label.c_str());
+
   // Dump the code around memory as:
   //  addr             contents                           ascii
   //  0000000000008d34 ef000000e8bd0090 e1b00000512fff1e  ............../Q
@@ -197,8 +204,13 @@
   size_t current = 0;
   size_t total_bytes = start + bytes;
   for (size_t line = 0; line < MEMORY_BYTES_TO_DUMP / MEMORY_BYTES_PER_LINE; line++) {
+    uint64_t tagged_addr = addr;
+    long tag = memory->ReadTag(addr);
+    if (tag >= 0) {
+      tagged_addr |= static_cast<uint64_t>(tag) << 56;
+    }
     std::string logline;
-    android::base::StringAppendF(&logline, "    %" PRIPTR, addr);
+    android::base::StringAppendF(&logline, "    %" PRIPTR, tagged_addr);
 
     addr += MEMORY_BYTES_PER_LINE;
     std::string ascii;
@@ -226,23 +238,6 @@
   }
 }
 
-void read_with_default(const char* path, char* buf, size_t len, const char* default_value) {
-  unique_fd fd(open(path, O_RDONLY | O_CLOEXEC));
-  if (fd != -1) {
-    int rc = TEMP_FAILURE_RETRY(read(fd.get(), buf, len - 1));
-    if (rc != -1) {
-      buf[rc] = '\0';
-
-      // Trim trailing newlines.
-      if (rc > 0 && buf[rc - 1] == '\n') {
-        buf[rc - 1] = '\0';
-      }
-      return;
-    }
-  }
-  strcpy(buf, default_value);
-}
-
 void drop_capabilities() {
   __user_cap_header_struct capheader;
   memset(&capheader, 0, sizeof(capheader));
diff --git a/debuggerd/util.cpp b/debuggerd/util.cpp
index a37b3b9..9d09210 100644
--- a/debuggerd/util.cpp
+++ b/debuggerd/util.cpp
@@ -17,6 +17,7 @@
 #include "util.h"
 
 #include <sys/socket.h>
+#include <time.h>
 
 #include <string>
 #include <utility>
@@ -38,3 +39,19 @@
   android::base::ReadFileToString(android::base::StringPrintf("/proc/%d/comm", tid), &result);
   return android::base::Trim(result);
 }
+
+std::string get_timestamp() {
+  timespec ts;
+  clock_gettime(CLOCK_REALTIME, &ts);
+
+  tm tm;
+  localtime_r(&ts.tv_sec, &tm);
+
+  char buf[strlen("1970-01-01 00:00:00.123456789+0830") + 1];
+  char* s = buf;
+  size_t sz = sizeof(buf), n;
+  n = strftime(s, sz, "%F %H:%M", &tm), s += n, sz -= n;
+  n = snprintf(s, sz, ":%02d.%09ld", tm.tm_sec, ts.tv_nsec), s += n, sz -= n;
+  n = strftime(s, sz, "%z", &tm), s += n, sz -= n;
+  return buf;
+}
diff --git a/debuggerd/util.h b/debuggerd/util.h
index e964423..07e7e99 100644
--- a/debuggerd/util.h
+++ b/debuggerd/util.h
@@ -23,3 +23,5 @@
 
 std::string get_process_name(pid_t pid);
 std::string get_thread_name(pid_t tid);
+
+std::string get_timestamp();
diff --git a/diagnose_usb/diagnose_usb.cpp b/diagnose_usb/diagnose_usb.cpp
index 5695ece..35edb5e 100644
--- a/diagnose_usb/diagnose_usb.cpp
+++ b/diagnose_usb/diagnose_usb.cpp
@@ -49,7 +49,7 @@
     // additionally just to be sure.
     if (group_member(plugdev_group->gr_gid) || getegid() == plugdev_group->gr_gid) {
         // The user is in plugdev so the problem is likely with the udev rules.
-        return "user in plugdev group; are your udev rules wrong?";
+        return "missing udev rules? user is in the plugdev group";
     }
     passwd* pwd = getpwuid(getuid());
     return android::base::StringPrintf("user %s is not in the plugdev group",
diff --git a/fastboot/Android.bp b/fastboot/Android.bp
index bdb786c..6673543 100644
--- a/fastboot/Android.bp
+++ b/fastboot/Android.bp
@@ -271,6 +271,7 @@
     required: [
         "mke2fs",
         "make_f2fs",
+        "make_f2fs_casefold",
     ],
     dist: {
         targets: [
diff --git a/fastboot/Android.mk b/fastboot/Android.mk
index fd009e7..0e918a3 100644
--- a/fastboot/Android.mk
+++ b/fastboot/Android.mk
@@ -21,6 +21,7 @@
 my_dist_files := $(SOONG_HOST_OUT_EXECUTABLES)/mke2fs
 my_dist_files += $(SOONG_HOST_OUT_EXECUTABLES)/e2fsdroid
 my_dist_files += $(SOONG_HOST_OUT_EXECUTABLES)/make_f2fs
+my_dist_files += $(SOONG_HOST_OUT_EXECUTABLES)/make_f2fs_casefold
 my_dist_files += $(SOONG_HOST_OUT_EXECUTABLES)/sload_f2fs
 $(call dist-for-goals,dist_files sdk win_sdk,$(my_dist_files))
 my_dist_files :=
diff --git a/fastboot/fastboot.bash b/fastboot/fastboot.bash
index cc1366c..406e8b8 100644
--- a/fastboot/fastboot.bash
+++ b/fastboot/fastboot.bash
@@ -109,7 +109,7 @@
 
     cur="${COMP_WORDS[COMP_CWORD]}"
     if [[ $i -eq $COMP_CWORD ]]; then
-        partitions="boot bootloader dtbo modem odm oem product radio recovery system vbmeta vendor vendor_dlkm"
+        partitions="boot bootloader dtbo modem odm odm_dlkm oem product radio recovery system vbmeta vendor vendor_dlkm"
         COMPREPLY=( $(compgen -W "$partitions" -- $cur) )
     else
         _fastboot_util_complete_local_file "${cur}" '!*.img'
diff --git a/fastboot/fastboot.cpp b/fastboot/fastboot.cpp
index 4ca6a6a..d33c987 100644
--- a/fastboot/fastboot.cpp
+++ b/fastboot/fastboot.cpp
@@ -145,6 +145,7 @@
     { "dtbo",     "dtbo.img",         "dtbo.sig",     "dtbo",     true,  ImageType::BootCritical },
     { "dts",      "dt.img",           "dt.sig",       "dts",      true,  ImageType::BootCritical },
     { "odm",      "odm.img",          "odm.sig",      "odm",      true,  ImageType::Normal },
+    { "odm_dlkm", "odm_dlkm.img",     "odm_dlkm.sig", "odm_dlkm", true,  ImageType::Normal },
     { "product",  "product.img",      "product.sig",  "product",  true,  ImageType::Normal },
     { "recovery", "recovery.img",     "recovery.sig", "recovery", true,  ImageType::BootCritical },
     { "super",    "super.img",        "super.sig",    "super",    true,  ImageType::Extra },
diff --git a/fastboot/fuzzy_fastboot/main.cpp b/fastboot/fuzzy_fastboot/main.cpp
index e7f785b..34ab32c 100644
--- a/fastboot/fuzzy_fastboot/main.cpp
+++ b/fastboot/fuzzy_fastboot/main.cpp
@@ -1286,7 +1286,7 @@
     ASSERT_TRUE(PartitionHash(fb.get(), "userdata", &hash_buf, &retcode, &err_msg)) << err_msg;
     ASSERT_EQ(retcode, 0) << err_msg;
 
-    // Sanity check of hash
+    // Validity check of hash
     EXPECT_NE(hash_before, hash_buf)
             << "Writing a random buffer to 'userdata' had the same hash as after erasing it";
     SetLockState(true);  // Lock the device
diff --git a/fs_mgr/TEST_MAPPING b/fs_mgr/TEST_MAPPING
index 6cd0430..a349408 100644
--- a/fs_mgr/TEST_MAPPING
+++ b/fs_mgr/TEST_MAPPING
@@ -7,7 +7,7 @@
       "name": "liblp_test"
     },
     {
-      "name": "fiemap_image_test_presubmit"
+      "name": "fiemap_image_test"
     },
     {
       "name": "fiemap_writer_test"
diff --git a/fs_mgr/fs_mgr.cpp b/fs_mgr/fs_mgr.cpp
index 0ae5787..9f22be5 100644
--- a/fs_mgr/fs_mgr.cpp
+++ b/fs_mgr/fs_mgr.cpp
@@ -301,13 +301,10 @@
     return true;
 }
 
-static bool needs_block_encryption(const FstabEntry& entry);
-static bool should_use_metadata_encryption(const FstabEntry& entry);
-
 // Read the primary superblock from an ext4 filesystem.  On failure return
 // false.  If it's not an ext4 filesystem, also set FS_STAT_INVALID_MAGIC.
-static bool read_ext4_superblock(const std::string& blk_device, const FstabEntry& entry,
-                                 struct ext4_super_block* sb, int* fs_stat) {
+static bool read_ext4_superblock(const std::string& blk_device, struct ext4_super_block* sb,
+                                 int* fs_stat) {
     android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(blk_device.c_str(), O_RDONLY | O_CLOEXEC)));
 
     if (fd < 0) {
@@ -324,29 +321,7 @@
         LINFO << "Invalid ext4 superblock on '" << blk_device << "'";
         // not a valid fs, tune2fs, fsck, and mount  will all fail.
         *fs_stat |= FS_STAT_INVALID_MAGIC;
-
-        bool encrypted = should_use_metadata_encryption(entry) || needs_block_encryption(entry);
-        if (entry.mount_point == "/data" &&
-            (!encrypted || android::base::StartsWith(blk_device, "/dev/block/dm-"))) {
-            // try backup superblock, if main superblock is corrupted
-            for (unsigned int blocksize = EXT4_MIN_BLOCK_SIZE; blocksize <= EXT4_MAX_BLOCK_SIZE;
-                 blocksize *= 2) {
-                uint64_t superblock = blocksize * 8;
-                if (blocksize == EXT4_MIN_BLOCK_SIZE) superblock++;
-
-                if (TEMP_FAILURE_RETRY(pread(fd, sb, sizeof(*sb), superblock * blocksize)) !=
-                    sizeof(*sb)) {
-                    PERROR << "Can't read '" << blk_device << "' superblock";
-                    return false;
-                }
-                if (is_ext4_superblock_valid(sb) &&
-                    (1 << (10 + sb->s_log_block_size) == blocksize)) {
-                    *fs_stat &= ~FS_STAT_INVALID_MAGIC;
-                    break;
-                }
-            }
-        }
-        if (*fs_stat & FS_STAT_INVALID_MAGIC) return false;
+        return false;
     }
     *fs_stat |= FS_STAT_IS_EXT4;
     LINFO << "superblock s_max_mnt_count:" << sb->s_max_mnt_count << "," << blk_device;
@@ -607,7 +582,7 @@
 
     LINFO << "Enabling ext4 metadata_csum on " << blk_device;
 
-    // requires to give last_fsck_time to current to avoid insane time.
+    // Must give `-T now` to prevent last_fsck_time from growing too large,
     // otherwise, tune2fs won't enable metadata_csum.
     const char* tune2fs_args[] = {TUNE2FS_BIN, "-O",        "metadata_csum,64bit,extent",
                                   "-T",        "now", blk_device.c_str()};
@@ -687,7 +662,7 @@
     if (is_extfs(entry.fs_type)) {
         struct ext4_super_block sb;
 
-        if (read_ext4_superblock(blk_device, entry, &sb, &fs_stat)) {
+        if (read_ext4_superblock(blk_device, &sb, &fs_stat)) {
             if ((sb.s_feature_incompat & EXT4_FEATURE_INCOMPAT_RECOVER) != 0 ||
                 (sb.s_state & EXT4_VALID_FS) == 0) {
                 LINFO << "Filesystem on " << blk_device << " was not cleanly shutdown; "
@@ -717,7 +692,7 @@
          entry.fs_mgr_flags.fs_verity || entry.fs_mgr_flags.ext_meta_csum)) {
         struct ext4_super_block sb;
 
-        if (read_ext4_superblock(blk_device, entry, &sb, &fs_stat)) {
+        if (read_ext4_superblock(blk_device, &sb, &fs_stat)) {
             tune_reserved_size(blk_device, entry, &sb, &fs_stat);
             tune_encrypt(blk_device, entry, &sb, &fs_stat);
             tune_verity(blk_device, entry, &sb, &fs_stat);
diff --git a/fs_mgr/fs_mgr_overlayfs.cpp b/fs_mgr/fs_mgr_overlayfs.cpp
index 1fa1aa1..a7704de 100644
--- a/fs_mgr/fs_mgr_overlayfs.cpp
+++ b/fs_mgr/fs_mgr_overlayfs.cpp
@@ -809,15 +809,26 @@
     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;
-    if (readonly) {
-        entry.flags |= MS_RDONLY;
-    } else {
+    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;
         fs_mgr_set_blk_ro(device_path, false);
     }
     entry.fs_mgr_flags.check = true;
     auto save_errno = errno;
-    auto mounted = fs_mgr_do_mount_one(entry) == 0;
+    if (mounted) mounted = fs_mgr_do_mount_one(entry) == 0;
     if (!mounted) {
         if ((entry.fs_type == "f2fs") && ext4) {
             entry.fs_type = "ext4";
diff --git a/fs_mgr/libdm/Android.bp b/fs_mgr/libdm/Android.bp
index 58241b3..e425284 100644
--- a/fs_mgr/libdm/Android.bp
+++ b/fs_mgr/libdm/Android.bp
@@ -42,6 +42,7 @@
             enabled: false,
         },
     },
+    ramdisk_available: true,
 }
 
 filegroup {
diff --git a/fs_mgr/libfiemap/Android.bp b/fs_mgr/libfiemap/Android.bp
index cae43e6..a622110 100644
--- a/fs_mgr/libfiemap/Android.bp
+++ b/fs_mgr/libfiemap/Android.bp
@@ -110,30 +110,3 @@
     auto_gen_config: true,
     require_root: true,
 }
-
-/* BUG(148874852) temporary test */
-cc_test {
-    name: "fiemap_image_test_presubmit",
-    cppflags: [
-        "-DSKIP_TEST_IN_PRESUBMIT",
-    ],
-    static_libs: [
-        "libcrypto_utils",
-        "libdm",
-        "libext4_utils",
-        "libfs_mgr",
-        "liblp",
-    ],
-    shared_libs: [
-        "libbase",
-        "libcrypto",
-        "libcutils",
-        "liblog",
-    ],
-    srcs: [
-        "image_test.cpp",
-    ],
-    test_suites: ["device-tests"],
-    auto_gen_config: true,
-    require_root: true,
-}
diff --git a/fs_mgr/libfiemap/fiemap_writer.cpp b/fs_mgr/libfiemap/fiemap_writer.cpp
index 4dd4bcc..621031a 100644
--- a/fs_mgr/libfiemap/fiemap_writer.cpp
+++ b/fs_mgr/libfiemap/fiemap_writer.cpp
@@ -45,7 +45,7 @@
 
 using namespace android::dm;
 
-// We cap the maximum number of extents as a sanity measure.
+// We cap the maximum number of extents as a robustness measure.
 static constexpr uint32_t kMaxExtents = 50000;
 
 // TODO: Fallback to using fibmap if FIEMAP_EXTENT_MERGED is set.
diff --git a/fs_mgr/libfiemap/split_fiemap_writer.cpp b/fs_mgr/libfiemap/split_fiemap_writer.cpp
index 12c7397..36bb3df 100644
--- a/fs_mgr/libfiemap/split_fiemap_writer.cpp
+++ b/fs_mgr/libfiemap/split_fiemap_writer.cpp
@@ -266,7 +266,7 @@
         cursor_file_pos_ += bytes_to_write;
     }
 
-    // If we've reached the end of the current file, close it for sanity.
+    // If we've reached the end of the current file, close it.
     if (cursor_file_pos_ == file->size()) {
         cursor_fd_ = {};
     }
diff --git a/fs_mgr/libfiemap/utility.cpp b/fs_mgr/libfiemap/utility.cpp
index 67c929e..54cf183 100644
--- a/fs_mgr/libfiemap/utility.cpp
+++ b/fs_mgr/libfiemap/utility.cpp
@@ -139,8 +139,7 @@
     }
 
     *bdev_name = ::android::base::Basename(sysfs_bdev);
-    // Paranoid sanity check to make sure we just didn't get the
-    // input in return as-is.
+    // Check that the symlink doesn't point to itself.
     if (sysfs_bdev == *bdev_name) {
         LOG(ERROR) << "Malformed symlink for block device: " << sysfs_bdev;
         return false;
diff --git a/fs_mgr/libfs_avb/avb_ops.cpp b/fs_mgr/libfs_avb/avb_ops.cpp
index c192bf5..46072bb 100644
--- a/fs_mgr/libfs_avb/avb_ops.cpp
+++ b/fs_mgr/libfs_avb/avb_ops.cpp
@@ -52,16 +52,16 @@
             partition, offset, num_bytes, buffer, out_num_read);
 }
 
-static AvbIOResult dummy_read_rollback_index(AvbOps* ops ATTRIBUTE_UNUSED,
-                                             size_t rollback_index_location ATTRIBUTE_UNUSED,
-                                             uint64_t* out_rollback_index) {
+static AvbIOResult no_op_read_rollback_index(AvbOps* ops ATTRIBUTE_UNUSED,
+                                            size_t rollback_index_location ATTRIBUTE_UNUSED,
+                                            uint64_t* out_rollback_index) {
     // rollback_index has been checked in bootloader phase.
     // In user-space, returns the smallest value 0 to pass the check.
     *out_rollback_index = 0;
     return AVB_IO_RESULT_OK;
 }
 
-static AvbIOResult dummy_validate_vbmeta_public_key(
+static AvbIOResult no_op_validate_vbmeta_public_key(
         AvbOps* ops ATTRIBUTE_UNUSED, const uint8_t* public_key_data ATTRIBUTE_UNUSED,
         size_t public_key_length ATTRIBUTE_UNUSED,
         const uint8_t* public_key_metadata ATTRIBUTE_UNUSED,
@@ -76,8 +76,8 @@
     return AVB_IO_RESULT_OK;
 }
 
-static AvbIOResult dummy_read_is_device_unlocked(AvbOps* ops ATTRIBUTE_UNUSED,
-                                                 bool* out_is_unlocked) {
+static AvbIOResult no_op_read_is_device_unlocked(AvbOps* ops ATTRIBUTE_UNUSED,
+                                                bool* out_is_unlocked) {
     // The function is for bootloader to update the value into
     // androidboot.vbmeta.device_state in kernel cmdline.
     // In user-space, returns true as we don't need to update it anymore.
@@ -85,9 +85,9 @@
     return AVB_IO_RESULT_OK;
 }
 
-static AvbIOResult dummy_get_unique_guid_for_partition(AvbOps* ops ATTRIBUTE_UNUSED,
-                                                       const char* partition ATTRIBUTE_UNUSED,
-                                                       char* guid_buf, size_t guid_buf_size) {
+static AvbIOResult no_op_get_unique_guid_for_partition(AvbOps* ops ATTRIBUTE_UNUSED,
+                                                      const char* partition ATTRIBUTE_UNUSED,
+                                                      char* guid_buf, size_t guid_buf_size) {
     // The function is for bootloader to set the correct UUID
     // for a given partition in kernel cmdline.
     // In user-space, returns a faking one as we don't need to update
@@ -96,9 +96,9 @@
     return AVB_IO_RESULT_OK;
 }
 
-static AvbIOResult dummy_get_size_of_partition(AvbOps* ops ATTRIBUTE_UNUSED,
-                                               const char* partition ATTRIBUTE_UNUSED,
-                                               uint64_t* out_size_num_byte) {
+static AvbIOResult no_op_get_size_of_partition(AvbOps* ops ATTRIBUTE_UNUSED,
+                                              const char* partition ATTRIBUTE_UNUSED,
+                                              uint64_t* out_size_num_byte) {
     // The function is for bootloader to load entire content of AVB HASH partitions.
     // In user-space, returns 0 as we only need to set up AVB HASHTHREE partitions.
     *out_size_num_byte = 0;
@@ -123,15 +123,15 @@
     // We only need to provide the implementation of read_from_partition()
     // operation since that's all what is being used by the avb_slot_verify().
     // Other I/O operations are only required in bootloader but not in
-    // user-space so we set them as dummy operations. Also zero the entire
+    // user-space so we set them as no-op operations. Also zero the entire
     // struct so operations added in the future will be set to NULL.
     memset(&avb_ops_, 0, sizeof(AvbOps));
     avb_ops_.read_from_partition = read_from_partition;
-    avb_ops_.read_rollback_index = dummy_read_rollback_index;
-    avb_ops_.validate_vbmeta_public_key = dummy_validate_vbmeta_public_key;
-    avb_ops_.read_is_device_unlocked = dummy_read_is_device_unlocked;
-    avb_ops_.get_unique_guid_for_partition = dummy_get_unique_guid_for_partition;
-    avb_ops_.get_size_of_partition = dummy_get_size_of_partition;
+    avb_ops_.read_rollback_index = no_op_read_rollback_index;
+    avb_ops_.validate_vbmeta_public_key = no_op_validate_vbmeta_public_key;
+    avb_ops_.read_is_device_unlocked = no_op_read_is_device_unlocked;
+    avb_ops_.get_unique_guid_for_partition = no_op_get_unique_guid_for_partition;
+    avb_ops_.get_size_of_partition = no_op_get_size_of_partition;
 
     // Sets user_data for GetInstanceFromAvbOps() to convert it back to FsManagerAvbOps.
     avb_ops_.user_data = this;
diff --git a/fs_mgr/libfs_avb/fs_avb.cpp b/fs_mgr/libfs_avb/fs_avb.cpp
index 5d504ab..49333a1 100644
--- a/fs_mgr/libfs_avb/fs_avb.cpp
+++ b/fs_mgr/libfs_avb/fs_avb.cpp
@@ -226,7 +226,7 @@
             return nullptr;
     }
 
-    // Sanity check here because we have to use vbmeta_images_[0] below.
+    // Validity check here because we have to use vbmeta_images_[0] below.
     if (avb_handle->vbmeta_images_.size() < 1) {
         LERROR << "LoadAndVerifyVbmetaByPartition failed, no vbmeta loaded";
         return nullptr;
@@ -405,11 +405,11 @@
     //   - AVB_SLOT_VERIFY_RESULT_ERROR_VERIFICATION (UNLOCKED only).
     //     Might occur in either the top-level vbmeta or a chained vbmeta.
     //   - AVB_SLOT_VERIFY_RESULT_ERROR_PUBLIC_KEY_REJECTED (UNLOCKED only).
-    //     Could only occur in a chained vbmeta. Because we have *dummy* operations in
+    //     Could only occur in a chained vbmeta. Because we have *no-op* operations in
     //     FsManagerAvbOps such that avb_ops->validate_vbmeta_public_key() used to validate
     //     the public key of the top-level vbmeta always pass in userspace here.
     //
-    // The following verify result won't happen, because the *dummy* operation
+    // The following verify result won't happen, because the *no-op* operation
     // avb_ops->read_rollback_index() always returns the minimum value zero. So rollbacked
     // vbmeta images, which should be caught in the bootloader stage, won't be detected here.
     //   - AVB_SLOT_VERIFY_RESULT_ERROR_ROLLBACK_INDEX
diff --git a/fs_mgr/libfs_avb/tests/util_test.cpp b/fs_mgr/libfs_avb/tests/util_test.cpp
index 5c388aa..a52a00d 100644
--- a/fs_mgr/libfs_avb/tests/util_test.cpp
+++ b/fs_mgr/libfs_avb/tests/util_test.cpp
@@ -222,7 +222,7 @@
     base::FilePath test_dir;
     ASSERT_TRUE(base::CreateTemporaryDirInDir(tmp_dir, "list-file-tests.", &test_dir));
 
-    // Generates dummy files to list.
+    // Generates test files to list.
     base::FilePath file_path_1 = test_dir.Append("1.txt");
     ASSERT_TRUE(base::WriteFile(file_path_1, "1", 1));
     base::FilePath file_path_2 = test_dir.Append("2.txt");
@@ -253,7 +253,7 @@
     base::FilePath test_dir;
     ASSERT_TRUE(base::CreateTemporaryDirInDir(tmp_dir, "list-file-tests.", &test_dir));
 
-    // Generates dummy files to list.
+    // Generates test files to list.
     base::FilePath file_path_1 = test_dir.Append("1.txt");
     ASSERT_TRUE(base::WriteFile(file_path_1, "1", 1));
     base::FilePath file_path_2 = test_dir.Append("2.txt");
@@ -281,7 +281,7 @@
     base::FilePath tmp_dir;
     ASSERT_TRUE(GetTempDir(&tmp_dir));
 
-    // Generates dummy files to list.
+    // Generates test files to list.
     base::FilePath no_such_dir = tmp_dir.Append("not_such_dir");
 
     auto fail = ListFiles(no_such_dir.value());
diff --git a/fs_mgr/liblp/builder_test.cpp b/fs_mgr/liblp/builder_test.cpp
index a21e09e..e4b617a 100644
--- a/fs_mgr/liblp/builder_test.cpp
+++ b/fs_mgr/liblp/builder_test.cpp
@@ -234,7 +234,7 @@
         EXPECT_EQ(lba, aligned_lba);
     }
 
-    // Sanity check one extent.
+    // Check one extent.
     EXPECT_EQ(exported->extents.back().target_data, 3072);
 }
 
diff --git a/fs_mgr/liblp/device_test.cpp b/fs_mgr/liblp/device_test.cpp
index 6af9d94..236fd8d 100644
--- a/fs_mgr/liblp/device_test.cpp
+++ b/fs_mgr/liblp/device_test.cpp
@@ -47,7 +47,7 @@
     BlockDeviceInfo device_info;
     ASSERT_TRUE(opener.GetInfo(fs_mgr_get_super_partition_name(), &device_info));
 
-    // Sanity check that the device doesn't give us some weird inefficient
+    // Check that the device doesn't give us some weird inefficient
     // alignment.
     EXPECT_EQ(device_info.alignment % LP_SECTOR_SIZE, 0);
     EXPECT_EQ(device_info.logical_block_size % LP_SECTOR_SIZE, 0);
diff --git a/fs_mgr/liblp/partition_opener.cpp b/fs_mgr/liblp/partition_opener.cpp
index 1d4db85..3d3dde6 100644
--- a/fs_mgr/liblp/partition_opener.cpp
+++ b/fs_mgr/liblp/partition_opener.cpp
@@ -49,7 +49,7 @@
         // Dynamic System Update is installed to an sdcard, which won't be in
         // the boot device list.
         //
-        // We whitelist because most devices in /dev/block are not valid for
+        // mmcblk* is allowed because most devices in /dev/block are not valid for
         // storing fiemaps.
         if (android::base::StartsWith(path, "mmcblk")) {
             return "/dev/block/" + path;
diff --git a/fs_mgr/liblp/reader.cpp b/fs_mgr/liblp/reader.cpp
index e6fd9f7..24ccc0f 100644
--- a/fs_mgr/liblp/reader.cpp
+++ b/fs_mgr/liblp/reader.cpp
@@ -174,7 +174,7 @@
         return false;
     }
 
-    // Do basic sanity checks before computing the checksum.
+    // Do basic validity checks before computing the checksum.
     if (header.magic != LP_METADATA_HEADER_MAGIC) {
         LERROR << "Logical partition metadata has invalid magic value.";
         return false;
@@ -255,7 +255,7 @@
 
     LpMetadataHeader& header = metadata->header;
 
-    // Sanity check the table size.
+    // Check the table size.
     if (header.tables_size > geometry.metadata_max_size) {
         LERROR << "Invalid partition metadata header table size.";
         return nullptr;
diff --git a/fs_mgr/liblp/writer.cpp b/fs_mgr/liblp/writer.cpp
index 8bf1ee9..2708efa 100644
--- a/fs_mgr/liblp/writer.cpp
+++ b/fs_mgr/liblp/writer.cpp
@@ -81,8 +81,8 @@
     return header_blob + tables;
 }
 
-// Perform sanity checks so we don't accidentally overwrite valid metadata
-// with potentially invalid metadata, or random partition data with metadata.
+// Perform checks so we don't accidentally overwrite valid metadata with
+// potentially invalid metadata, or random partition data with metadata.
 static bool ValidateAndSerializeMetadata([[maybe_unused]] const IPartitionOpener& opener,
                                          const LpMetadata& metadata, const std::string& slot_suffix,
                                          std::string* blob) {
diff --git a/fs_mgr/libsnapshot/Android.bp b/fs_mgr/libsnapshot/Android.bp
index 95301ff..eaef180 100644
--- a/fs_mgr/libsnapshot/Android.bp
+++ b/fs_mgr/libsnapshot/Android.bp
@@ -310,3 +310,36 @@
     auto_gen_config: true,
     require_root: true,
 }
+
+cc_defaults {
+    name: "snapuserd_defaults",
+    srcs: [
+        "snapuserd.cpp",
+    ],
+
+    cflags: [
+        "-Wall",
+        "-Werror"
+    ],
+
+    static_libs: [
+        "libbase",
+        "liblog",
+        "libdm",
+    ],
+}
+
+cc_binary {
+    name: "snapuserd",
+    defaults: ["snapuserd_defaults"],
+}
+
+cc_binary {
+    name: "snapuserd_ramdisk",
+    stem: "snapuserd",
+    defaults: ["snapuserd_defaults"],
+
+    ramdisk: true,
+    static_executable: true,
+    system_shared_libs: [],
+}
diff --git a/fs_mgr/libsnapshot/include/libsnapshot/snapshot.h b/fs_mgr/libsnapshot/include/libsnapshot/snapshot.h
index 3c2c776..a4a3150 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/snapshot.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/snapshot.h
@@ -553,9 +553,8 @@
     // This should only be called in recovery.
     bool UnmapAllPartitions();
 
-    // Sanity check no snapshot overflows. Note that this returns false negatives if the snapshot
-    // overflows, then is remapped and not written afterwards. Hence, the function may only serve
-    // as a sanity check.
+    // Check no snapshot overflows. Note that this returns false negatives if the snapshot
+    // overflows, then is remapped and not written afterwards.
     bool EnsureNoOverflowSnapshot(LockedFile* lock);
 
     enum class Slot { Unknown, Source, Target };
diff --git a/fs_mgr/libsnapshot/include_test/libsnapshot/test_helpers.h b/fs_mgr/libsnapshot/include_test/libsnapshot/test_helpers.h
index 98bf56a..8e369b0 100644
--- a/fs_mgr/libsnapshot/include_test/libsnapshot/test_helpers.h
+++ b/fs_mgr/libsnapshot/include_test/libsnapshot/test_helpers.h
@@ -180,5 +180,22 @@
     uint64_t bsize_ = 0;
 };
 
+bool IsVirtualAbEnabled();
+
+#define SKIP_IF_NON_VIRTUAL_AB()                                                        \
+    do {                                                                                \
+        if (!IsVirtualAbEnabled()) GTEST_SKIP() << "Test for Virtual A/B devices only"; \
+    } while (0)
+
+#define RETURN_IF_NON_VIRTUAL_AB_MSG(msg) \
+    do {                                  \
+        if (!IsVirtualAbEnabled()) {      \
+            std::cerr << (msg);           \
+            return;                       \
+        }                                 \
+    } while (0)
+
+#define RETURN_IF_NON_VIRTUAL_AB() RETURN_IF_NON_VIRTUAL_AB_MSG("")
+
 }  // namespace snapshot
 }  // namespace android
diff --git a/fs_mgr/libsnapshot/partition_cow_creator_test.cpp b/fs_mgr/libsnapshot/partition_cow_creator_test.cpp
index adfb975..2970222 100644
--- a/fs_mgr/libsnapshot/partition_cow_creator_test.cpp
+++ b/fs_mgr/libsnapshot/partition_cow_creator_test.cpp
@@ -41,8 +41,14 @@
 
 class PartitionCowCreatorTest : public ::testing::Test {
   public:
-    void SetUp() override { SnapshotTestPropertyFetcher::SetUp(); }
-    void TearDown() override { SnapshotTestPropertyFetcher::TearDown(); }
+    void SetUp() override {
+        SKIP_IF_NON_VIRTUAL_AB();
+        SnapshotTestPropertyFetcher::SetUp();
+    }
+    void TearDown() override {
+        RETURN_IF_NON_VIRTUAL_AB();
+        SnapshotTestPropertyFetcher::TearDown();
+    }
 };
 
 TEST_F(PartitionCowCreatorTest, IntersectSelf) {
@@ -223,6 +229,8 @@
 }
 
 TEST(DmSnapshotInternals, CowSizeCalculator) {
+    SKIP_IF_NON_VIRTUAL_AB();
+
     DmSnapCowSizeCalculator cc(512, 8);
     unsigned long int b;
 
@@ -286,7 +294,9 @@
     std::optional<InstallOperation> expected_output;
 };
 
-class OptimizeOperationTest : public ::testing::TestWithParam<OptimizeOperationTestParam> {};
+class OptimizeOperationTest : public ::testing::TestWithParam<OptimizeOperationTestParam> {
+    void SetUp() override { SKIP_IF_NON_VIRTUAL_AB(); }
+};
 TEST_P(OptimizeOperationTest, Test) {
     InstallOperation actual_output;
     EXPECT_EQ(GetParam().expected_output.has_value(),
diff --git a/fs_mgr/libsnapshot/snapshot.cpp b/fs_mgr/libsnapshot/snapshot.cpp
index 7488bda..b49f99e 100644
--- a/fs_mgr/libsnapshot/snapshot.cpp
+++ b/fs_mgr/libsnapshot/snapshot.cpp
@@ -300,9 +300,9 @@
         LOG(ERROR) << "SnapshotStatus has no name.";
         return false;
     }
-    // Sanity check these sizes. Like liblp, we guarantee the partition size
-    // is respected, which means it has to be sector-aligned. (This guarantee
-    // is useful for locating avb footers correctly). The COW file size, however,
+    // Check these sizes. Like liblp, we guarantee the partition size is
+    // respected, which means it has to be sector-aligned. (This guarantee is
+    // useful for locating avb footers correctly). The COW file size, however,
     // can be arbitrarily larger than specified, so we can safely round it up.
     if (status->device_size() % kSectorSize != 0) {
         LOG(ERROR) << "Snapshot " << status->name()
@@ -351,7 +351,6 @@
     }
 
     // The COW file size should have been rounded up to the nearest sector in CreateSnapshot.
-    // Sanity check this.
     if (status.cow_file_size() % kSectorSize != 0) {
         LOG(ERROR) << "Snapshot " << name << " COW file size is not a multiple of the sector size: "
                    << status.cow_file_size();
diff --git a/fs_mgr/libsnapshot/snapshot_fuzz.cpp b/fs_mgr/libsnapshot/snapshot_fuzz.cpp
index 5b145c3..aced3ed 100644
--- a/fs_mgr/libsnapshot/snapshot_fuzz.cpp
+++ b/fs_mgr/libsnapshot/snapshot_fuzz.cpp
@@ -141,7 +141,7 @@
                        const RecoveryCreateSnapshotDevicesArgs& args) {
     std::unique_ptr<AutoDevice> device;
     if (args.has_metadata_device_object()) {
-        device = std::make_unique<DummyAutoDevice>(args.metadata_mounted());
+        device = std::make_unique<NoOpAutoDevice>(args.metadata_mounted());
     }
     return snapshot->RecoveryCreateSnapshotDevices(device);
 }
diff --git a/fs_mgr/libsnapshot/snapshot_fuzz_utils.h b/fs_mgr/libsnapshot/snapshot_fuzz_utils.h
index fa327b8..5319e69 100644
--- a/fs_mgr/libsnapshot/snapshot_fuzz_utils.h
+++ b/fs_mgr/libsnapshot/snapshot_fuzz_utils.h
@@ -35,9 +35,9 @@
 class AutoMemBasedDir;
 class SnapshotFuzzDeviceInfo;
 
-class DummyAutoDevice : public AutoDevice {
+class NoOpAutoDevice : public AutoDevice {
   public:
-    DummyAutoDevice(bool mounted) : AutoDevice(mounted ? "dummy" : "") {}
+    NoOpAutoDevice(bool mounted) : AutoDevice(mounted ? "no_op" : "") {}
 };
 
 struct SnapshotTestModule {
diff --git a/fs_mgr/libsnapshot/snapshot_metadata_updater.cpp b/fs_mgr/libsnapshot/snapshot_metadata_updater.cpp
index 051584c..17a0c96 100644
--- a/fs_mgr/libsnapshot/snapshot_metadata_updater.cpp
+++ b/fs_mgr/libsnapshot/snapshot_metadata_updater.cpp
@@ -39,6 +39,8 @@
 SnapshotMetadataUpdater::SnapshotMetadataUpdater(MetadataBuilder* builder, uint32_t target_slot,
                                                  const DeltaArchiveManifest& manifest)
     : builder_(builder), target_suffix_(SlotSuffixForSlotNumber(target_slot)) {
+    partial_update_ = manifest.partial_update();
+
     if (!manifest.has_dynamic_partition_metadata()) {
         return;
     }
@@ -63,7 +65,6 @@
         }
     }
 
-    partial_update_ = manifest.partial_update();
 }
 
 bool SnapshotMetadataUpdater::ShrinkPartitions() const {
@@ -173,9 +174,9 @@
         if (iter != groups_.end()) {
             continue;
         }
-        // Update package metadata doesn't have this group. Before deleting it, sanity check that it
-        // doesn't have any partitions left. Update metadata shouldn't assign any partitions to this
-        // group, so all partitions that originally belong to this group should be moved by
+        // Update package metadata doesn't have this group. Before deleting it, check that it
+        // doesn't have any partitions left. Update metadata shouldn't assign any partitions to
+        // this group, so all partitions that originally belong to this group should be moved by
         // MovePartitionsToDefault at this point.
         auto existing_partitions_in_group = builder_->ListPartitionsInGroup(existing_group_name);
         if (!existing_partitions_in_group.empty()) {
diff --git a/fs_mgr/libsnapshot/snapshot_metadata_updater_test.cpp b/fs_mgr/libsnapshot/snapshot_metadata_updater_test.cpp
index 5530e59..0a16c03 100644
--- a/fs_mgr/libsnapshot/snapshot_metadata_updater_test.cpp
+++ b/fs_mgr/libsnapshot/snapshot_metadata_updater_test.cpp
@@ -43,11 +43,11 @@
 
 class SnapshotMetadataUpdaterTest : public ::testing::TestWithParam<uint32_t> {
   public:
-    SnapshotMetadataUpdaterTest() {
-        is_virtual_ab_ = android::base::GetBoolProperty("ro.virtual_ab.enabled", false);
-    }
+    SnapshotMetadataUpdaterTest() = default;
 
     void SetUp() override {
+        SKIP_IF_NON_VIRTUAL_AB();
+
         target_slot_ = GetParam();
         target_suffix_ = SlotSuffixForSlotNumber(target_slot_);
         SnapshotTestPropertyFetcher::SetUp(SlotSuffixForSlotNumber(1 - target_slot_));
@@ -68,7 +68,11 @@
         ASSERT_TRUE(FillFakeMetadata(builder_.get(), manifest_, target_suffix_));
     }
 
-    void TearDown() override { SnapshotTestPropertyFetcher::TearDown(); }
+    void TearDown() override {
+        RETURN_IF_NON_VIRTUAL_AB();
+
+        SnapshotTestPropertyFetcher::TearDown();
+    }
 
     // Append suffix to name.
     std::string T(std::string_view name) { return std::string(name) + target_suffix_; }
@@ -127,7 +131,6 @@
                                   << ".";
     }
 
-    bool is_virtual_ab_;
     std::unique_ptr<MetadataBuilder> builder_;
     uint32_t target_slot_;
     std::string target_suffix_;
diff --git a/fs_mgr/libsnapshot/snapshot_test.cpp b/fs_mgr/libsnapshot/snapshot_test.cpp
index 2bd0135..6ff935b 100644
--- a/fs_mgr/libsnapshot/snapshot_test.cpp
+++ b/fs_mgr/libsnapshot/snapshot_test.cpp
@@ -83,9 +83,7 @@
 
 class SnapshotTest : public ::testing::Test {
   public:
-    SnapshotTest() : dm_(DeviceMapper::Instance()) {
-        is_virtual_ab_ = android::base::GetBoolProperty("ro.virtual_ab.enabled", false);
-    }
+    SnapshotTest() : dm_(DeviceMapper::Instance()) {}
 
     // This is exposed for main.
     void Cleanup() {
@@ -95,7 +93,7 @@
 
   protected:
     void SetUp() override {
-        if (!is_virtual_ab_) GTEST_SKIP() << "Test for Virtual A/B devices only";
+        SKIP_IF_NON_VIRTUAL_AB();
 
         SnapshotTestPropertyFetcher::SetUp();
         InitializeState();
@@ -106,7 +104,7 @@
     }
 
     void TearDown() override {
-        if (!is_virtual_ab_) return;
+        RETURN_IF_NON_VIRTUAL_AB();
 
         lock_ = nullptr;
 
@@ -341,7 +339,6 @@
     }
 
     static constexpr std::chrono::milliseconds snapshot_timeout_ = 5s;
-    bool is_virtual_ab_;
     DeviceMapper& dm_;
     std::unique_ptr<SnapshotManager::LockedFile> lock_;
     android::fiemap::IImageManager* image_manager_ = nullptr;
@@ -722,11 +719,13 @@
 class LockTest : public ::testing::Test {
   public:
     void SetUp() {
+        SKIP_IF_NON_VIRTUAL_AB();
         first_consumer.StartHandleRequestsInBackground();
         second_consumer.StartHandleRequestsInBackground();
     }
 
     void TearDown() {
+        RETURN_IF_NON_VIRTUAL_AB();
         EXPECT_TRUE(first_consumer.MakeRequest(Request::EXIT));
         EXPECT_TRUE(second_consumer.MakeRequest(Request::EXIT));
     }
@@ -770,7 +769,7 @@
 class SnapshotUpdateTest : public SnapshotTest {
   public:
     void SetUp() override {
-        if (!is_virtual_ab_) GTEST_SKIP() << "Test for Virtual A/B devices only";
+        SKIP_IF_NON_VIRTUAL_AB();
 
         SnapshotTest::SetUp();
         Cleanup();
@@ -832,7 +831,7 @@
         }
     }
     void TearDown() override {
-        if (!is_virtual_ab_) return;
+        RETURN_IF_NON_VIRTUAL_AB();
 
         Cleanup();
         SnapshotTest::TearDown();
@@ -1365,13 +1364,17 @@
     ASSERT_EQ(UpdateState::MergeCompleted, init->ProcessUpdateState());
 }
 
-class MetadataMountedTest : public SnapshotUpdateTest {
+class MetadataMountedTest : public ::testing::Test {
   public:
+    // This is so main() can instantiate this to invoke Cleanup.
+    virtual void TestBody() override {}
     void SetUp() override {
+        SKIP_IF_NON_VIRTUAL_AB();
         metadata_dir_ = test_device->GetMetadataDir();
         ASSERT_TRUE(ReadDefaultFstab(&fstab_));
     }
     void TearDown() override {
+        RETURN_IF_NON_VIRTUAL_AB();
         SetUp();
         // Remount /metadata
         test_device->set_recovery(false);
@@ -1702,8 +1705,6 @@
 };
 
 TEST_P(FlashAfterUpdateTest, FlashSlotAfterUpdate) {
-    if (!is_virtual_ab_) GTEST_SKIP() << "Test for Virtual A/B devices only";
-
     // OTA client blindly unmaps all partitions that are possibly mapped.
     for (const auto& name : {"sys_b", "vnd_b", "prd_b"}) {
         ASSERT_TRUE(sm->UnmapUpdateSnapshot(name));
@@ -1803,14 +1804,13 @@
 class ImageManagerTest : public SnapshotTest, public WithParamInterface<uint64_t> {
   protected:
     void SetUp() override {
-        if (!is_virtual_ab_) GTEST_SKIP() << "Test for Virtual A/B devices only";
-
+        SKIP_IF_NON_VIRTUAL_AB();
         SnapshotTest::SetUp();
         userdata_ = std::make_unique<LowSpaceUserdata>();
         ASSERT_TRUE(userdata_->Init(GetParam()));
     }
     void TearDown() override {
-        if (!is_virtual_ab_) return;
+        RETURN_IF_NON_VIRTUAL_AB();
         return;  // BUG(149738928)
 
         EXPECT_TRUE(!image_manager_->BackingImageExists(kImageName) ||
@@ -1852,11 +1852,6 @@
 
 INSTANTIATE_TEST_SUITE_P(ImageManagerTest, ImageManagerTest, ValuesIn(ImageManagerTestParams()));
 
-}  // namespace snapshot
-}  // namespace android
-
-using namespace android::snapshot;
-
 bool Mkdir(const std::string& path) {
     if (mkdir(path.c_str(), 0700) && errno != EEXIST) {
         std::cerr << "Could not mkdir " << path << ": " << strerror(errno) << std::endl;
@@ -1865,8 +1860,21 @@
     return true;
 }
 
-int main(int argc, char** argv) {
-    ::testing::InitGoogleTest(&argc, argv);
+class SnapshotTestEnvironment : public ::testing::Environment {
+  public:
+    ~SnapshotTestEnvironment() override {}
+    void SetUp() override;
+    void TearDown() override;
+
+  private:
+    std::unique_ptr<IImageManager> super_images_;
+};
+
+void SnapshotTestEnvironment::SetUp() {
+    // b/163082876: GTEST_SKIP in Environment will make atest report incorrect results. Until
+    // that is fixed, don't call GTEST_SKIP here, but instead call GTEST_SKIP in individual test
+    // suites.
+    RETURN_IF_NON_VIRTUAL_AB_MSG("Virtual A/B is not enabled, skipping global setup.\n");
 
     std::vector<std::string> paths = {
             // clang-format off
@@ -1879,18 +1887,13 @@
             // clang-format on
     };
     for (const auto& path : paths) {
-        if (!Mkdir(path)) {
-            return 1;
-        }
+        ASSERT_TRUE(Mkdir(path));
     }
 
     // Create this once, otherwise, gsid will start/stop between each test.
     test_device = new TestDeviceInfo();
     sm = SnapshotManager::New(test_device);
-    if (!sm) {
-        std::cerr << "Could not create snapshot manager\n";
-        return 1;
-    }
+    ASSERT_NE(nullptr, sm) << "Could not create snapshot manager";
 
     // Clean up previous run.
     MetadataMountedTest().TearDown();
@@ -1898,31 +1901,35 @@
     SnapshotTest().Cleanup();
 
     // Use a separate image manager for our fake super partition.
-    auto super_images = IImageManager::Open("ota/test/super", 10s);
-    if (!super_images) {
-        std::cerr << "Could not create image manager\n";
-        return 1;
-    }
+    super_images_ = IImageManager::Open("ota/test/super", 10s);
+    ASSERT_NE(nullptr, super_images_) << "Could not create image manager";
 
     // Clean up any old copy.
-    DeleteBackingImage(super_images.get(), "fake-super");
+    DeleteBackingImage(super_images_.get(), "fake-super");
 
     // Create and map the fake super partition.
     static constexpr int kImageFlags =
             IImageManager::CREATE_IMAGE_DEFAULT | IImageManager::CREATE_IMAGE_ZERO_FILL;
-    if (!super_images->CreateBackingImage("fake-super", kSuperSize, kImageFlags)) {
-        std::cerr << "Could not create fake super partition\n";
-        return 1;
-    }
-    if (!super_images->MapImageDevice("fake-super", 10s, &fake_super)) {
-        std::cerr << "Could not map fake super partition\n";
-        return 1;
-    }
+    ASSERT_TRUE(super_images_->CreateBackingImage("fake-super", kSuperSize, kImageFlags))
+            << "Could not create fake super partition";
+
+    ASSERT_TRUE(super_images_->MapImageDevice("fake-super", 10s, &fake_super))
+            << "Could not map fake super partition";
     test_device->set_fake_super(fake_super);
+}
 
-    auto result = RUN_ALL_TESTS();
+void SnapshotTestEnvironment::TearDown() {
+    RETURN_IF_NON_VIRTUAL_AB();
+    if (super_images_ != nullptr) {
+        DeleteBackingImage(super_images_.get(), "fake-super");
+    }
+}
 
-    DeleteBackingImage(super_images.get(), "fake-super");
+}  // namespace snapshot
+}  // namespace android
 
-    return result;
+int main(int argc, char** argv) {
+    ::testing::InitGoogleTest(&argc, argv);
+    ::testing::AddGlobalTestEnvironment(new ::android::snapshot::SnapshotTestEnvironment());
+    return RUN_ALL_TESTS();
 }
diff --git a/fs_mgr/libsnapshot/snapuserd.cpp b/fs_mgr/libsnapshot/snapuserd.cpp
new file mode 100644
index 0000000..a6ff4fd
--- /dev/null
+++ b/fs_mgr/libsnapshot/snapuserd.cpp
@@ -0,0 +1,126 @@
+/*
+ * 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 <linux/types.h>
+
+#include <android-base/file.h>
+#include <android-base/logging.h>
+#include <android-base/stringprintf.h>
+#include <android-base/unique_fd.h>
+#include <libdm/dm.h>
+
+using android::base::unique_fd;
+
+#define DM_USER_MAP_READ 0
+#define DM_USER_MAP_WRITE 1
+
+struct dm_user_message {
+    __u64 seq;
+    __u64 type;
+    __u64 flags;
+    __u64 sector;
+    __u64 len;
+    __u8 buf[];
+};
+
+using namespace android::dm;
+
+static int daemon_main(const std::string& device) {
+    unique_fd block_fd(open(device.c_str(), O_RDWR));
+    if (block_fd < 0) {
+        PLOG(ERROR) << "Unable to open " << device;
+        return 1;
+    }
+
+    unique_fd ctrl_fd(open("/dev/dm-user", O_RDWR));
+    if (ctrl_fd < 0) {
+        PLOG(ERROR) << "Unable to open /dev/dm-user";
+        return 1;
+    }
+
+    size_t buf_size = 1UL << 16;
+    auto buf = std::make_unique<char>(buf_size);
+
+    /* Just keeps pumping messages between userspace and the kernel.  We won't
+     * actually be doing anything, but the sequence numbers line up so it'll at
+     * least make forward progress. */
+    while (true) {
+        struct dm_user_message* msg = (struct dm_user_message*)buf.get();
+
+        memset(buf.get(), 0, buf_size);
+
+        ssize_t readed = read(ctrl_fd.get(), buf.get(), buf_size);
+        if (readed < 0) {
+            PLOG(ERROR) << "Control read failed, trying with more space";
+            buf_size *= 2;
+            buf = std::make_unique<char>(buf_size);
+            continue;
+        }
+
+        LOG(DEBUG) << android::base::StringPrintf("read() from dm-user returned %d bytes:",
+                                                  (int)readed);
+        LOG(DEBUG) << android::base::StringPrintf("    msg->seq:    0x%016llx", msg->seq);
+        LOG(DEBUG) << android::base::StringPrintf("    msg->type:   0x%016llx", msg->type);
+        LOG(DEBUG) << android::base::StringPrintf("    msg->flags:  0x%016llx", msg->flags);
+        LOG(DEBUG) << android::base::StringPrintf("    msg->sector: 0x%016llx", msg->sector);
+        LOG(DEBUG) << android::base::StringPrintf("    msg->len:    0x%016llx", msg->len);
+
+        switch (msg->type) {
+            case DM_USER_MAP_READ: {
+                LOG(DEBUG) << android::base::StringPrintf(
+                        "Responding to read of sector %lld with %lld bytes data", msg->sector,
+                        msg->len);
+
+                if ((sizeof(*msg) + msg->len) > buf_size) {
+                    auto old_buf = std::move(buf);
+                    buf_size = sizeof(*msg) + msg->len;
+                    buf = std::make_unique<char>(buf_size);
+                    memcpy(buf.get(), old_buf.get(), sizeof(*msg));
+                    msg = (struct dm_user_message*)buf.get();
+                }
+
+                if (lseek(block_fd.get(), msg->sector * 512, SEEK_SET) < 0) {
+                    PLOG(ERROR) << "lseek failed: " << device;
+                    return 7;
+                }
+                if (!android::base::ReadFully(block_fd.get(), msg->buf, msg->len)) {
+                    PLOG(ERROR) << "read failed: " << device;
+                    return 7;
+                }
+
+                if (!android::base::WriteFully(ctrl_fd.get(), buf.get(), sizeof(*msg) + msg->len)) {
+                    PLOG(ERROR) << "write control failed";
+                    return 3;
+                }
+                break;
+            }
+
+            case DM_USER_MAP_WRITE:
+                abort();
+                break;
+        }
+
+        LOG(DEBUG) << "read() finished, next message";
+    }
+
+    return 0;
+}
+
+int main([[maybe_unused]] int argc, char** argv) {
+    android::base::InitLogging(argv, &android::base::KernelLogger);
+    daemon_main(argv[1]);
+    return 0;
+}
diff --git a/fs_mgr/libsnapshot/test_helpers.cpp b/fs_mgr/libsnapshot/test_helpers.cpp
index de3d912..b07bf91 100644
--- a/fs_mgr/libsnapshot/test_helpers.cpp
+++ b/fs_mgr/libsnapshot/test_helpers.cpp
@@ -18,6 +18,7 @@
 
 #include <android-base/file.h>
 #include <android-base/logging.h>
+#include <android-base/properties.h>
 #include <android-base/strings.h>
 #include <android-base/unique_fd.h>
 #include <gtest/gtest.h>
@@ -241,5 +242,9 @@
     return bsize_;
 }
 
+bool IsVirtualAbEnabled() {
+    return android::base::GetBoolProperty("ro.virtual_ab.enabled", false);
+}
+
 }  // namespace snapshot
 }  // namespace android
diff --git a/fs_mgr/tests/adb-remount-test.sh b/fs_mgr/tests/adb-remount-test.sh
index 82c4262..d56f7f2 100755
--- a/fs_mgr/tests/adb-remount-test.sh
+++ b/fs_mgr/tests/adb-remount-test.sh
@@ -15,13 +15,17 @@
 
 adb remount tests
 
---color                     Dress output with highlighting colors
---help                      This help
---no-wait-screen            Do not wait for display screen to settle
---print-time                Report the test duration
---serial                    Specify device (must if multiple are present)
---wait-adb <duration>       adb wait timeout
---wait-fastboot <duration>  fastboot wait timeout
+-c --color                     Dress output with highlighting colors
+-h --help                      This help
+-D --no-wait-screen            Do not wait for display screen to settle
+-t --print-time                Report the test duration
+-s --serial                    Specify device (must if multiple are present)"
+if [ -n "`which timeout`" ]; then
+  USAGE="${USAGE}
+-a --wait-adb <duration>       adb wait timeout
+-f --wait-fastboot <duration>  fastboot wait timeout"
+fi
+USAGE="${USAGE}
 
 Conditions:
  - Must be a userdebug build.
@@ -46,10 +50,10 @@
 ESCAPE="`echo | tr '\n' '\033'`"
 # A _real_ embedded carriage return character
 CR="`echo | tr '\n' '\r'`"
-GREEN="${ESCAPE}[38;5;40m"
-RED="${ESCAPE}[38;5;196m"
-ORANGE="${ESCAPE}[38;5;255:165:0m"
-BLUE="${ESCAPE}[35m"
+GREEN="${ESCAPE}[32m"
+RED="${ESCAPE}[31m"
+YELLOW="${ESCAPE}[33m"
+BLUE="${ESCAPE}[34m"
 NORMAL="${ESCAPE}[0m"
 TMPDIR=${TMPDIR:-/tmp}
 print_time=false
@@ -72,7 +76,7 @@
     if [ -n "${ANDROID_SERIAL}" ]; then
       grep "^${ANDROID_SERIAL}[${SPACE}${TAB}]" > /dev/null
     else
-      wc -l | grep '^1$' >/dev/null
+      wc -l | grep "^[${SPACE}${TAB}]*1\$" >/dev/null
     fi
 }
 
@@ -85,7 +89,7 @@
     if [ -n "${ANDROID_SERIAL}" ]; then
       grep "^${ANDROID_SERIAL}[${SPACE}${TAB}]" > /dev/null
     else
-      wc -l | grep '^1$' >/dev/null
+      wc -l | grep "^[${SPACE}${TAB}]*1\$" >/dev/null
     fi
 }
 
@@ -100,7 +104,7 @@
       grep "^${ANDROID_SERIAL}[${SPACE}${TAB}][${SPACE}${TAB}]*recovery\$" >/dev/null
     return ${?}
   fi
-  if echo "${list}" | wc -l | grep '^1$' >/dev/null; then
+  if echo "${list}" | wc -l | grep "^[${SPACE}${TAB}]*1\$" >/dev/null; then
     echo "${list}" |
       grep "[${SPACE}${TAB}]recovery\$" >/dev/null
     return ${?}
@@ -143,7 +147,7 @@
   adb logcat "${@}" </dev/null |
     tr -d '\r' |
     grep -v 'logd    : logdr: UID=' |
-    sed -e '${/------- beginning of kernel/d}' -e 's/^[0-1][0-9]-[0-3][0-9] //'
+    sed -e '${ /------- beginning of kernel/d }' -e 's/^[0-1][0-9]-[0-3][0-9] //'
 }
 
 [ "USAGE: avc_check >/dev/stderr
@@ -160,7 +164,7 @@
   if [ -z "${L}" ]; then
     return
   fi
-  echo "${ORANGE}[  WARNING ]${NORMAL} unlabeled sepolicy violations:" >&2
+  echo "${YELLOW}[  WARNING ]${NORMAL} unlabeled sepolicy violations:" >&2
   echo "${L}" | sed "s/^/${INDENT}/" >&2
 }
 
@@ -284,7 +288,7 @@
   local start=`date +%s`
   local duration=
   local ret
-  if [ -n "${1}" ]; then
+  if [ -n "${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}"
@@ -299,7 +303,7 @@
   if [ 0 = ${ret} -a -n "${ACTIVE_SLOT}" ]; then
     local active_slot=`get_active_slot`
     if [ X"${ACTIVE_SLOT}" != X"${active_slot}" ]; then
-      echo "${ORANGE}[  WARNING ]${NORMAL} Active slot changed from ${ACTIVE_SLOT} to ${active_slot}" >&2
+      echo "${YELLOW}[  WARNING ]${NORMAL} Active slot changed from ${ACTIVE_SLOT} to ${active_slot}" >&2
     fi
   fi
   local end=`date +%s`
@@ -359,18 +363,22 @@
     echo "(In adb mode `adb_user`)"
   else
     echo "(USB stack borken for ${USB_ADDRESS})"
-    USB_DEVICE=`usb_devnum`
-    if [ -n "${USB_DEVICE}" ]; then
-      echo "# lsusb -v -s ${USB_DEVICE#dev}"
-      local D=`lsusb -v -s ${USB_DEVICE#dev} 2>&1`
-      if [ -n "${D}" ]; then
-        echo "${D}"
-      else
-        lsusb -v
+    if [ -n "`which usb_devnum`" ]; then
+      USB_DEVICE=`usb_devnum`
+      if [ -n "`which lsusb`" ]; then
+        if [ -n "${USB_DEVICE}" ]; then
+          echo "# lsusb -v -s ${USB_DEVICE#dev}"
+          local D=`lsusb -v -s ${USB_DEVICE#dev} 2>&1`
+          if [ -n "${D}" ]; then
+            echo "${D}"
+          else
+            lsusb -v
+          fi
+        else
+          echo "# lsusb -v (expected device missing)"
+          lsusb -v
+        fi
       fi
-    else
-      echo "# lsusb -v (expected device missing)"
-      lsusb -v
     fi >&2
   fi
 }
@@ -382,7 +390,7 @@
   local ret
   # fastboot has no wait-for-device, but it does an automatic
   # wait and requires (even a nonsensical) command to do so.
-  if [ -n "${1}" ]; then
+  if [ -n "${1}" -a -n "`which timeout`" ]; then
     USB_DEVICE=`usb_devnum --next`
     echo -n ". . . waiting `format_duration ${1}`" ${ANDROID_SERIAL} ${USB_ADDRESS} ${USB_DEVICE} "${CR}"
     timeout --preserve-status --signal=KILL ${1} fastboot wait-for-device >/dev/null 2>/dev/null
@@ -398,7 +406,7 @@
   if [ 0 = ${ret} -a -n "${ACTIVE_SLOT}" ]; then
     local active_slot=`get_active_slot`
     if [ X"${ACTIVE_SLOT}" != X"${active_slot}" ]; then
-      echo "${ORANGE}[  WARNING ]${NORMAL} Active slot changed from ${ACTIVE_SLOT} to ${active_slot}"
+      echo "${YELLOW}[  WARNING ]${NORMAL} Active slot changed from ${ACTIVE_SLOT} to ${active_slot}"
     fi >&2
   fi
   return ${ret}
@@ -409,7 +417,7 @@
 Returns: waits until the device has returned for recovery or optional timeout" ]
 recovery_wait() {
   local ret
-  if [ -n "${1}" ]; then
+  if [ -n "${1}" -a -n "`which timeout`" ]; then
     USB_DEVICE=`usb_devnum --next`
     echo -n ". . . waiting `format_duration ${1}`" ${ANDROID_SERIAL} ${USB_ADDRESS} ${USB_DEVICE} "${CR}"
     timeout --preserve-status --signal=KILL ${1} adb wait-for-recovery 2>/dev/null
@@ -423,7 +431,7 @@
   if [ 0 = ${ret} -a -n "${ACTIVE_SLOT}" ]; then
     local active_slot=`get_active_slot`
     if [ X"${ACTIVE_SLOT}" != X"${active_slot}" ]; then
-      echo "${ORANGE}[  WARNING ]${NORMAL} Active slot changed from ${ACTIVE_SLOT} to ${active_slot}"
+      echo "${YELLOW}[  WARNING ]${NORMAL} Active slot changed from ${ACTIVE_SLOT} to ${active_slot}"
     fi >&2
   fi
   return ${ret}
@@ -732,6 +740,7 @@
   grep -v \
     -e "^\(overlay\|tmpfs\|none\|sysfs\|proc\|selinuxfs\|debugfs\|bpf\) " \
     -e "^\(binfmt_misc\|cg2_bpf\|pstore\|tracefs\|adb\|mtp\|ptp\|devpts\) " \
+    -e "^\(ramdumpfs\) " \
     -e " functionfs " \
     -e "^\(/data/media\|/dev/block/loop[0-9]*\) " \
     -e "^rootfs / rootfs rw," \
@@ -753,13 +762,28 @@
 ##  MAINLINE
 ##
 
-OPTIONS=`getopt --alternative --unquoted \
-                --longoptions help,serial:,colour,color,no-colour,no-color \
-                --longoptions wait-adb:,wait-fastboot: \
-                --longoptions wait-screen,wait-display \
-                --longoptions no-wait-screen,no-wait-display \
-                --longoptions gtest_print_time,print-time \
-                -- "?hs:" ${*}` ||
+HOSTOS=`uname`
+GETOPTS="--alternative --unquoted
+         --longoptions help,serial:,colour,color,no-colour,no-color
+         --longoptions wait-adb:,wait-fastboot:
+         --longoptions wait-screen,wait-display
+         --longoptions no-wait-screen,no-wait-display
+         --longoptions gtest_print_time,print-time
+         --"
+if [ "Darwin" = "${HOSTOS}" ]; then
+  GETOPTS=
+  USAGE="`echo \"${USAGE}\" |
+            sed 's/--color/       /g
+                 1s/--help/-h/
+                 s/--help/      /g
+                 s/--no-wait-screen/                /g
+                 s/--print-time/            /g
+                 1s/--serial/-s/
+                 s/--serial/        /g
+                 s/--wait-adb/          /g
+                 s/--wait-fastboot/               /g'`"
+fi
+OPTIONS=`getopt ${GETOPTS} "?a:cCdDf:hs:t" ${*}` ||
   ( echo "${USAGE}" >&2 ; false ) ||
   die "getopt failure"
 set -- ${OPTIONS}
@@ -775,26 +799,26 @@
       export ANDROID_SERIAL=${2}
       shift
       ;;
-    --color | --colour)
+    -c | --color | --colour)
       color=true
       ;;
-    --no-color | --no-colour)
+    -C | --no-color | --no-colour)
       color=false
       ;;
-    --no-wait-display | --no-wait-screen)
+    -D | --no-wait-display | --no-wait-screen)
       screen_wait=false
       ;;
-    --wait-display | --wait-screen)
+    -d | --wait-display | --wait-screen)
       screen_wait=true
       ;;
-    --print-time | --gtest_print_time)
+    -t | --print-time | --gtest_print_time)
       print_time=true
       ;;
-    --wait-adb)
+    -a | --wait-adb)
       ADB_WAIT=${2}
       shift
       ;;
-    --wait-fastboot)
+    -f | --wait-fastboot)
       FASTBOOT_WAIT=${2}
       shift
       ;;
@@ -815,7 +839,7 @@
 if ! ${color}; then
   GREEN=""
   RED=""
-  ORANGE=""
+  YELLOW=""
   BLUE=""
   NORMAL=""
 fi
@@ -827,14 +851,14 @@
 inFastboot && die "device in fastboot mode"
 inRecovery && die "device in recovery mode"
 if ! inAdb; then
-  echo "${ORANGE}[  WARNING ]${NORMAL} device not in adb mode" >&2
+  echo "${YELLOW}[  WARNING ]${NORMAL} device not in adb mode" >&2
   adb_wait ${ADB_WAIT}
 fi
 inAdb || die "specified device not in adb mode"
 isDebuggable || die "device not a debug build"
 enforcing=true
 if ! adb_su getenforce </dev/null | grep 'Enforcing' >/dev/null; then
-  echo "${ORANGE}[  WARNING ]${NORMAL} device does not have sepolicy in enforcing mode" >&2
+  echo "${YELLOW}[  WARNING ]${NORMAL} device does not have sepolicy in enforcing mode" >&2
   enforcing=false
 fi
 
@@ -846,9 +870,13 @@
 [ -n "${D}" ] || D=`get_property ro.boot.serialno`
 [ -z "${D}" -o -n "${ANDROID_SERIAL}" ] || ANDROID_SERIAL=${D}
 USB_SERIAL=
-[ -z "${ANDROID_SERIAL}" ] || USB_SERIAL=`find /sys/devices -name serial |
-                                          grep usb |
-                                          xargs -r grep -l ${ANDROID_SERIAL}`
+if [ -n "${ANDROID_SERIAL}" -a "Darwin" != "${HOSTOS}" ]; then
+  USB_SERIAL="`find /sys/devices -name serial | grep usb`"
+  if [ -n "${USB_SERIAL}" ]; then
+    USB_SERIAL=`echo "${USB_SERIAL}" |
+                  xargs grep -l ${ANDROID_SERIAL}`
+  fi
+fi
 USB_ADDRESS=
 if [ -n "${USB_SERIAL}" ]; then
   USB_ADDRESS=${USB_SERIAL%/serial}
@@ -860,13 +888,16 @@
 BUILD_DESCRIPTION=`get_property ro.build.description`
 [ -z "${BUILD_DESCRIPTION}" ] ||
   echo "${BLUE}[     INFO ]${NORMAL} ${BUILD_DESCRIPTION}" >&2
+KERNEL_VERSION="`adb_su cat /proc/version </dev/null 2>/dev/null`"
+[ -z "${KERNEL_VERSION}" ] ||
+  echo "${BLUE}[     INFO ]${NORMAL} ${KERNEL_VERSION}" >&2
 ACTIVE_SLOT=`get_active_slot`
 [ -z "${ACTIVE_SLOT}" ] ||
   echo "${BLUE}[     INFO ]${NORMAL} active slot is ${ACTIVE_SLOT}" >&2
 
 # Acquire list of system partitions
 
-PARTITIONS=`adb_su cat /vendor/etc/fstab* |
+PARTITIONS=`adb_su cat /vendor/etc/fstab* </dev/null |
               skip_administrative_mounts |
               sed -n "s@^\([^ ${TAB}/][^ ${TAB}/]*\)[ ${TAB}].*[, ${TAB}]ro[, ${TAB}].*@\1@p" |
               sort -u |
@@ -903,9 +934,12 @@
   done
 
 # 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
+fi
 if ! wait_for_screen && ${screen_wait}; then
   screen_wait=false
-  echo "${ORANGE}[  WARNING ]${NORMAL} not healthy, no launcher, skipping wait for screen" >&2
+  echo "${YELLOW}[  WARNING ]${NORMAL} not healthy, no launcher, skipping wait for screen" >&2
 fi
 
 # Can we test remount -R command?
@@ -954,7 +988,7 @@
   adb_su remount -R system </dev/null
   err=${?}
   if [ "${err}" != 0 ]; then
-    echo "${ORANGE}[  WARNING ]${NORMAL} adb shell su root remount -R system = ${err}, likely did not reboot!" >&2
+    echo "${YELLOW}[  WARNING ]${NORMAL} adb shell su root remount -R system = ${err}, likely did not reboot!" >&2
     T="-t ${T}"
   else
     # Rebooted, logcat will be meaningless, and last logcat will likely be clear
@@ -980,7 +1014,7 @@
   adb_sh grep "nodev${TAB}overlay" /proc/filesystems </dev/null >/dev/null 2>/dev/null &&
   echo "${GREEN}[       OK ]${NORMAL} overlay module present" >&2 ||
   (
-    echo "${ORANGE}[  WARNING ]${NORMAL} overlay module not present" >&2 &&
+    echo "${YELLOW}[  WARNING ]${NORMAL} overlay module not present" >&2 &&
       false
   ) ||
   overlayfs_supported=false
@@ -989,7 +1023,7 @@
     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 "${ORANGE}[  WARNING ]${NORMAL} overlay module does not support override_creds" >&2 &&
+        echo "${YELLOW}[  WARNING ]${NORMAL} overlay module does not support override_creds" >&2 &&
         overlayfs_supported=false
         ;;
       *)
@@ -1011,14 +1045,14 @@
 reboot=false
 for d in ${OVERLAYFS_BACKING}; do
   if adb_sh ls -d /${d}/overlay </dev/null >/dev/null 2>/dev/null; then
-    echo "${ORANGE}[  WARNING ]${NORMAL} /${d}/overlay is setup, surgically wiping" >&2
+    echo "${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 ${reboot}; then
-  echo "${ORANGE}[  WARNING ]${NORMAL} rebooting before test" >&2
+  echo "${YELLOW}[  WARNING ]${NORMAL} rebooting before test" >&2
   adb_reboot &&
     adb_wait ${ADB_WAIT} ||
     die "lost device after reboot after wipe `usb_status`"
@@ -1030,7 +1064,7 @@
   D=`echo "${D}" | grep -v " /vendor/..*$" | grep "^overlay "` &&
   echo "${H}" &&
   echo "${D}" &&
-  echo "${ORANGE}[  WARNING ]${NORMAL} overlays present before setup" >&2 ||
+  echo "${YELLOW}[  WARNING ]${NORMAL} overlays present before setup" >&2 ||
   echo "${GREEN}[       OK ]${NORMAL} no overlay present before setup" >&2
 overlayfs_needed=true
 D=`adb_sh cat /proc/mounts </dev/null |
@@ -1083,7 +1117,7 @@
 if [ X"${D}" != X"${H}" ]; then
   echo "${H}"
   if [ X"${D}" != X"${D##*setup failed}" ]; then
-    echo "${ORANGE}[  WARNING ]${NORMAL} overlayfs setup whined" >&2
+    echo "${YELLOW}[  WARNING ]${NORMAL} overlayfs setup whined" >&2
   fi
   D=`adb_sh df -k </dev/null` &&
     H=`echo "${D}" | head -1` &&
@@ -1130,7 +1164,7 @@
 elif ${rebooted}; then
   echo "${GREEN}[       OK ]${NORMAL} verity already disabled" >&2
 else
-  echo "${ORANGE}[  WARNING ]${NORMAL} verity already disabled" >&2
+  echo "${YELLOW}[  WARNING ]${NORMAL} verity already disabled" >&2
 fi
 
 echo "${GREEN}[ RUN      ]${NORMAL} remount" >&2
@@ -1160,7 +1194,7 @@
     die -t ${T} "overlay takeover failed"
   fi
   echo "${D}" | grep "^overlay .* /system\$" >/dev/null ||
-   echo "${ORANGE}[  WARNING ]${NORMAL} overlay takeover not complete" >&2
+   echo "${YELLOW}[  WARNING ]${NORMAL} overlay takeover not complete" >&2
   if [ -z "${virtual_ab}" ]; then
     scratch_partition=scratch
   fi
@@ -1292,7 +1326,7 @@
 
 fixup_from_recovery() {
   inRecovery || return 1
-  echo "${ORANGE}[    ERROR ]${NORMAL} Device in recovery" >&2
+  echo "${YELLOW}[    ERROR ]${NORMAL} Device in recovery" >&2
   adb reboot </dev/null
   adb_wait ${ADB_WAIT}
 }
@@ -1312,7 +1346,7 @@
   adb_su sed -n '1,/overlay \/system/p' /proc/mounts </dev/null |
     skip_administrative_mounts |
     grep -v ' \(erofs\|squashfs\|ext4\|f2fs\|vfat\) ' &&
-    echo "${ORANGE}[  WARNING ]${NORMAL} overlay takeover after first stage init" >&2 ||
+    echo "${YELLOW}[  WARNING ]${NORMAL} overlay takeover after first stage init" >&2 ||
     echo "${GREEN}[       OK ]${NORMAL} overlay takeover in first stage init" >&2
 fi
 
@@ -1373,20 +1407,20 @@
 is_userspace_fastboot=false
 
 if ! ${is_bootloader_fastboot}; then
-  echo "${ORANGE}[  WARNING ]${NORMAL} does not support fastboot, skipping"
+  echo "${YELLOW}[  WARNING ]${NORMAL} does not support fastboot, skipping"
 elif [ -z "${ANDROID_PRODUCT_OUT}" ]; then
-  echo "${ORANGE}[  WARNING ]${NORMAL} build tree not setup, skipping"
+  echo "${YELLOW}[  WARNING ]${NORMAL} build tree not setup, skipping"
 elif [ ! -s "${ANDROID_PRODUCT_OUT}/vendor.img" ]; then
-  echo "${ORANGE}[  WARNING ]${NORMAL} vendor image missing, skipping"
+  echo "${YELLOW}[  WARNING ]${NORMAL} vendor image missing, skipping"
 elif [ "${ANDROID_PRODUCT_OUT}" = "${ANDROID_PRODUCT_OUT%*/${H}}" ]; then
-  echo "${ORANGE}[  WARNING ]${NORMAL} wrong vendor image, skipping"
+  echo "${YELLOW}[  WARNING ]${NORMAL} wrong vendor image, skipping"
 elif [ -z "${ANDROID_HOST_OUT}" ]; then
-  echo "${ORANGE}[  WARNING ]${NORMAL} please run lunch, skipping"
+  echo "${YELLOW}[  WARNING ]${NORMAL} please run lunch, skipping"
 elif ! (
           adb_cat /vendor/build.prop |
           cmp -s ${ANDROID_PRODUCT_OUT}/vendor/build.prop
        ) >/dev/null 2>/dev/null; then
-  echo "${ORANGE}[  WARNING ]${NORMAL} vendor image signature mismatch, skipping"
+  echo "${YELLOW}[  WARNING ]${NORMAL} vendor image signature mismatch, skipping"
 else
   wait_for_screen
   avc_check
@@ -1432,7 +1466,7 @@
   fi
   fastboot reboot ||
     die "can not reboot out of fastboot"
-  echo "${ORANGE}[  WARNING ]${NORMAL} adb after fastboot"
+  echo "${YELLOW}[  WARNING ]${NORMAL} adb after fastboot"
   adb_wait ${ADB_WAIT} ||
     fixup_from_recovery ||
     die "did not reboot after formatting ${scratch_partition} `usb_status`"
@@ -1449,8 +1483,8 @@
       if ${is_userspace_fastboot}; then
         die  "overlay supposed to be minus /vendor takeover after flash vendor"
       else
-        echo "${ORANGE}[  WARNING ]${NORMAL} user fastboot missing required to invalidate, ignoring a failure" >&2
-        echo "${ORANGE}[  WARNING ]${NORMAL} overlay supposed to be minus /vendor takeover after flash vendor" >&2
+        echo "${YELLOW}[  WARNING ]${NORMAL} user fastboot missing required to invalidate, ignoring a failure" >&2
+        echo "${YELLOW}[  WARNING ]${NORMAL} overlay supposed to be minus /vendor takeover after flash vendor" >&2
       fi
   fi
   B="`adb_cat /system/hello`"
@@ -1468,7 +1502,7 @@
     check_eq "cat: /vendor/hello: No such file or directory" "${B}" \
              vendor content after flash vendor
   else
-    echo "${ORANGE}[  WARNING ]${NORMAL} user fastboot missing required to invalidate, ignoring a failure" >&2
+    echo "${YELLOW}[  WARNING ]${NORMAL} user fastboot missing required to invalidate, ignoring a failure" >&2
     check_eq "cat: /vendor/hello: No such file or directory" "${B}" \
              --warning vendor content after flash vendor
   fi
@@ -1489,7 +1523,7 @@
 L=
 D="${H%?Now reboot your device for settings to take effect*}"
 if [ X"${H}" != X"${D}" ]; then
-  echo "${ORANGE}[  WARNING ]${NORMAL} adb remount requires a reboot after partial flash (legacy avb)"
+  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 ${ADB_WAIT} &&
@@ -1547,7 +1581,7 @@
   err=${?}
   if [ X"${D}" != "${D%?Now reboot your device for settings to take effect*}" ]
   then
-    echo "${ORANGE}[  WARNING ]${NORMAL} adb disable-verity requires a reboot after partial flash"
+    echo "${YELLOW}[  WARNING ]${NORMAL} adb disable-verity requires a reboot after partial flash"
     adb_reboot &&
       adb_wait ${ADB_WAIT} &&
       adb_root ||
@@ -1580,9 +1614,9 @@
   if [ -n "${ACTIVE_SLOT}" ]; then
     local active_slot=`get_active_slot`
     if [ X"${ACTIVE_SLOT}" != X"${active_slot}" ]; then
-      echo "${ORANGE}[    ERROR ]${NORMAL} Active slot changed from ${ACTIVE_SLOT} to ${active_slot}"
+      echo "${YELLOW}[    ERROR ]${NORMAL} Active slot changed from ${ACTIVE_SLOT} to ${active_slot}"
     else
-      echo "${ORANGE}[    ERROR ]${NORMAL} Active slot to be set to ${ACTIVE_SLOT}"
+      echo "${YELLOW}[    ERROR ]${NORMAL} Active slot to be set to ${ACTIVE_SLOT}"
     fi >&2
     fastboot --set-active=${ACTIVE_SLOT}
   fi
diff --git a/healthd/Android.bp b/healthd/Android.bp
index 14d46b3..65eaedd 100644
--- a/healthd/Android.bp
+++ b/healthd/Android.bp
@@ -240,3 +240,20 @@
     defaults: ["charger_defaults"],
     srcs: ["charger_test.cpp"],
 }
+
+cc_test {
+    name: "libhealthd_charger_test",
+    srcs: ["AnimationParser_test.cpp"],
+    shared_libs: [
+        "liblog",
+        "libbase",
+        "libcutils",
+    ],
+    static_libs: [
+        "libhealthd_charger",
+    ],
+    test_suites: [
+        "general-tests",
+        "device-tests",
+    ],
+}
diff --git a/healthd/AnimationParser.cpp b/healthd/AnimationParser.cpp
index fde3b95..6b08570 100644
--- a/healthd/AnimationParser.cpp
+++ b/healthd/AnimationParser.cpp
@@ -37,8 +37,8 @@
     return true;
 }
 
-bool remove_prefix(const std::string& line, const char* prefix, const char** rest) {
-    const char* str = line.c_str();
+bool remove_prefix(std::string_view line, const char* prefix, const char** rest) {
+    const char* str = line.data();
     int start;
     char c;
 
diff --git a/healthd/AnimationParser.h b/healthd/AnimationParser.h
index bc00845..f55b563 100644
--- a/healthd/AnimationParser.h
+++ b/healthd/AnimationParser.h
@@ -17,6 +17,8 @@
 #ifndef HEALTHD_ANIMATION_PARSER_H
 #define HEALTHD_ANIMATION_PARSER_H
 
+#include <string_view>
+
 #include "animation.h"
 
 namespace android {
@@ -24,7 +26,7 @@
 bool parse_animation_desc(const std::string& content, animation* anim);
 
 bool can_ignore_line(const char* str);
-bool remove_prefix(const std::string& str, const char* prefix, const char** rest);
+bool remove_prefix(std::string_view str, const char* prefix, const char** rest);
 bool parse_text_field(const char* in, animation::text_field* field);
 }  // namespace android
 
diff --git a/healthd/tests/AnimationParser_test.cpp b/healthd/AnimationParser_test.cpp
similarity index 100%
rename from healthd/tests/AnimationParser_test.cpp
rename to healthd/AnimationParser_test.cpp
diff --git a/healthd/TEST_MAPPING b/healthd/TEST_MAPPING
new file mode 100644
index 0000000..5893d10
--- /dev/null
+++ b/healthd/TEST_MAPPING
@@ -0,0 +1,7 @@
+{
+  "presubmit": [
+    {
+      "name": "libhealthd_charger_test"
+    }
+  ]
+}
diff --git a/healthd/tests/Android.mk b/healthd/tests/Android.mk
deleted file mode 100644
index 87e8862..0000000
--- a/healthd/tests/Android.mk
+++ /dev/null
@@ -1,21 +0,0 @@
-# Copyright 2016 The Android Open Source Project
-
-LOCAL_PATH:= $(call my-dir)
-
-include $(CLEAR_VARS)
-
-LOCAL_SRC_FILES := \
-    AnimationParser_test.cpp \
-
-LOCAL_MODULE := healthd_test
-LOCAL_MODULE_TAGS := tests
-
-LOCAL_STATIC_LIBRARIES := \
-	libhealthd_internal \
-
-LOCAL_SHARED_LIBRARIES := \
-	liblog \
-	libbase \
-	libcutils \
-
-include $(BUILD_NATIVE_TEST)
diff --git a/init/AndroidTest.xml b/init/AndroidTest.xml
index 17f509a..6f22ab7 100644
--- a/init/AndroidTest.xml
+++ b/init/AndroidTest.xml
@@ -32,4 +32,7 @@
         <option name="module-name" value="CtsInitTestCases" />
         <option name="runtime-hint" value="65s" />
     </test>
+    <!-- Controller that will skip the module if a native bridge situation is detected -->
+    <!-- For example: module wants to run arm32 and device is x86 -->
+    <object type="module_controller" class="com.android.tradefed.testtype.suite.module.NativeBridgeModuleController" />
 </configuration>
diff --git a/init/block_dev_initializer.cpp b/init/block_dev_initializer.cpp
index b423f86..8db9793 100644
--- a/init/block_dev_initializer.cpp
+++ b/init/block_dev_initializer.cpp
@@ -37,7 +37,15 @@
 }
 
 bool BlockDevInitializer::InitDeviceMapper() {
-    const std::string dm_path = "/devices/virtual/misc/device-mapper";
+    return InitMiscDevice("device-mapper");
+}
+
+bool BlockDevInitializer::InitDmUser() {
+    return InitMiscDevice("dm-user");
+}
+
+bool BlockDevInitializer::InitMiscDevice(const std::string& name) {
+    const std::string dm_path = "/devices/virtual/misc/" + name;
     bool found = false;
     auto dm_callback = [this, &dm_path, &found](const Uevent& uevent) {
         if (uevent.path == dm_path) {
@@ -49,13 +57,13 @@
     };
     uevent_listener_.RegenerateUeventsForPath("/sys" + dm_path, dm_callback);
     if (!found) {
-        LOG(INFO) << "device-mapper device not found in /sys, waiting for its uevent";
+        LOG(INFO) << name << " device not found in /sys, waiting for its uevent";
         Timer t;
         uevent_listener_.Poll(dm_callback, 10s);
-        LOG(INFO) << "Wait for device-mapper returned after " << t;
+        LOG(INFO) << "Wait for " << name << " returned after " << t;
     }
     if (!found) {
-        LOG(ERROR) << "device-mapper device not found after polling timeout";
+        LOG(ERROR) << name << " device not found after polling timeout";
         return false;
     }
     return true;
diff --git a/init/block_dev_initializer.h b/init/block_dev_initializer.h
index 0d4c6e9..b8dd3f1 100644
--- a/init/block_dev_initializer.h
+++ b/init/block_dev_initializer.h
@@ -27,12 +27,15 @@
     BlockDevInitializer();
 
     bool InitDeviceMapper();
+    bool InitDmUser();
     bool InitDevices(std::set<std::string> devices);
     bool InitDmDevice(const std::string& device);
 
   private:
     ListenerAction HandleUevent(const Uevent& uevent, std::set<std::string>* devices);
 
+    bool InitMiscDevice(const std::string& name);
+
     std::unique_ptr<DeviceHandler> device_handler_;
     UeventListener uevent_listener_;
 };
diff --git a/init/capabilities.cpp b/init/capabilities.cpp
index a91cd1d..0b9f161 100644
--- a/init/capabilities.cpp
+++ b/init/capabilities.cpp
@@ -28,47 +28,55 @@
 namespace init {
 
 static const std::map<std::string, int> cap_map = {
-    CAP_MAP_ENTRY(CHOWN),
-    CAP_MAP_ENTRY(DAC_OVERRIDE),
-    CAP_MAP_ENTRY(DAC_READ_SEARCH),
-    CAP_MAP_ENTRY(FOWNER),
-    CAP_MAP_ENTRY(FSETID),
-    CAP_MAP_ENTRY(KILL),
-    CAP_MAP_ENTRY(SETGID),
-    CAP_MAP_ENTRY(SETUID),
-    CAP_MAP_ENTRY(SETPCAP),
-    CAP_MAP_ENTRY(LINUX_IMMUTABLE),
-    CAP_MAP_ENTRY(NET_BIND_SERVICE),
-    CAP_MAP_ENTRY(NET_BROADCAST),
-    CAP_MAP_ENTRY(NET_ADMIN),
-    CAP_MAP_ENTRY(NET_RAW),
-    CAP_MAP_ENTRY(IPC_LOCK),
-    CAP_MAP_ENTRY(IPC_OWNER),
-    CAP_MAP_ENTRY(SYS_MODULE),
-    CAP_MAP_ENTRY(SYS_RAWIO),
-    CAP_MAP_ENTRY(SYS_CHROOT),
-    CAP_MAP_ENTRY(SYS_PTRACE),
-    CAP_MAP_ENTRY(SYS_PACCT),
-    CAP_MAP_ENTRY(SYS_ADMIN),
-    CAP_MAP_ENTRY(SYS_BOOT),
-    CAP_MAP_ENTRY(SYS_NICE),
-    CAP_MAP_ENTRY(SYS_RESOURCE),
-    CAP_MAP_ENTRY(SYS_TIME),
-    CAP_MAP_ENTRY(SYS_TTY_CONFIG),
-    CAP_MAP_ENTRY(MKNOD),
-    CAP_MAP_ENTRY(LEASE),
-    CAP_MAP_ENTRY(AUDIT_WRITE),
-    CAP_MAP_ENTRY(AUDIT_CONTROL),
-    CAP_MAP_ENTRY(SETFCAP),
-    CAP_MAP_ENTRY(MAC_OVERRIDE),
-    CAP_MAP_ENTRY(MAC_ADMIN),
-    CAP_MAP_ENTRY(SYSLOG),
-    CAP_MAP_ENTRY(WAKE_ALARM),
-    CAP_MAP_ENTRY(BLOCK_SUSPEND),
-    CAP_MAP_ENTRY(AUDIT_READ),
+        CAP_MAP_ENTRY(CHOWN),
+        CAP_MAP_ENTRY(DAC_OVERRIDE),
+        CAP_MAP_ENTRY(DAC_READ_SEARCH),
+        CAP_MAP_ENTRY(FOWNER),
+        CAP_MAP_ENTRY(FSETID),
+        CAP_MAP_ENTRY(KILL),
+        CAP_MAP_ENTRY(SETGID),
+        CAP_MAP_ENTRY(SETUID),
+        CAP_MAP_ENTRY(SETPCAP),
+        CAP_MAP_ENTRY(LINUX_IMMUTABLE),
+        CAP_MAP_ENTRY(NET_BIND_SERVICE),
+        CAP_MAP_ENTRY(NET_BROADCAST),
+        CAP_MAP_ENTRY(NET_ADMIN),
+        CAP_MAP_ENTRY(NET_RAW),
+        CAP_MAP_ENTRY(IPC_LOCK),
+        CAP_MAP_ENTRY(IPC_OWNER),
+        CAP_MAP_ENTRY(SYS_MODULE),
+        CAP_MAP_ENTRY(SYS_RAWIO),
+        CAP_MAP_ENTRY(SYS_CHROOT),
+        CAP_MAP_ENTRY(SYS_PTRACE),
+        CAP_MAP_ENTRY(SYS_PACCT),
+        CAP_MAP_ENTRY(SYS_ADMIN),
+        CAP_MAP_ENTRY(SYS_BOOT),
+        CAP_MAP_ENTRY(SYS_NICE),
+        CAP_MAP_ENTRY(SYS_RESOURCE),
+        CAP_MAP_ENTRY(SYS_TIME),
+        CAP_MAP_ENTRY(SYS_TTY_CONFIG),
+        CAP_MAP_ENTRY(MKNOD),
+        CAP_MAP_ENTRY(LEASE),
+        CAP_MAP_ENTRY(AUDIT_WRITE),
+        CAP_MAP_ENTRY(AUDIT_CONTROL),
+        CAP_MAP_ENTRY(SETFCAP),
+        CAP_MAP_ENTRY(MAC_OVERRIDE),
+        CAP_MAP_ENTRY(MAC_ADMIN),
+        CAP_MAP_ENTRY(SYSLOG),
+        CAP_MAP_ENTRY(WAKE_ALARM),
+        CAP_MAP_ENTRY(BLOCK_SUSPEND),
+        CAP_MAP_ENTRY(AUDIT_READ),
+#if defined(__BIONIC__)
+        CAP_MAP_ENTRY(PERFMON),
+        CAP_MAP_ENTRY(BPF),
+#endif
 };
 
+#if defined(__BIONIC__)
+static_assert(CAP_LAST_CAP == CAP_BPF, "CAP_LAST_CAP is not CAP_BPF");
+#else
 static_assert(CAP_LAST_CAP == CAP_AUDIT_READ, "CAP_LAST_CAP is not CAP_AUDIT_READ");
+#endif
 
 static bool ComputeCapAmbientSupported() {
 #if defined(__ANDROID__)
diff --git a/init/init.cpp b/init/init.cpp
index ba880ea..cb5bbba 100644
--- a/init/init.cpp
+++ b/init/init.cpp
@@ -18,6 +18,7 @@
 
 #include <dirent.h>
 #include <fcntl.h>
+#include <paths.h>
 #include <pthread.h>
 #include <signal.h>
 #include <stdlib.h>
@@ -727,6 +728,12 @@
     InitSecondStageLogging(argv);
     LOG(INFO) << "init second stage started!";
 
+    // Update $PATH in the case the second stage init is newer than first stage init, where it is
+    // first set.
+    if (setenv("PATH", _PATH_DEFPATH, 1) != 0) {
+        PLOG(FATAL) << "Could not set $PATH to '" << _PATH_DEFPATH << "' in second stage";
+    }
+
     // Init should not crash because of a dependence on any other process, therefore we ignore
     // SIGPIPE and handle EPIPE at the call site directly.  Note that setting a signal to SIG_IGN
     // is inherited across exec, but custom signal handlers are not.  Since we do not want to
diff --git a/init/mount_namespace.cpp b/init/mount_namespace.cpp
index f8359bc..59cc140 100644
--- a/init/mount_namespace.cpp
+++ b/init/mount_namespace.cpp
@@ -44,50 +44,17 @@
 namespace init {
 namespace {
 
-static bool BindMount(const std::string& source, const std::string& mount_point,
-                      bool recursive = false) {
-    unsigned long mountflags = MS_BIND;
-    if (recursive) {
-        mountflags |= MS_REC;
-    }
-    if (mount(source.c_str(), mount_point.c_str(), nullptr, mountflags, nullptr) == -1) {
+static bool BindMount(const std::string& source, const std::string& mount_point) {
+    if (mount(source.c_str(), mount_point.c_str(), nullptr, MS_BIND | MS_REC, nullptr) == -1) {
         PLOG(ERROR) << "Failed to bind mount " << source;
         return false;
     }
     return true;
 }
 
-static bool MakeShared(const std::string& mount_point, bool recursive = false) {
-    unsigned long mountflags = MS_SHARED;
-    if (recursive) {
-        mountflags |= MS_REC;
-    }
+static bool ChangeMount(const std::string& mount_point, unsigned long mountflags) {
     if (mount(nullptr, mount_point.c_str(), nullptr, mountflags, nullptr) == -1) {
-        PLOG(ERROR) << "Failed to change propagation type to shared";
-        return false;
-    }
-    return true;
-}
-
-static bool MakeSlave(const std::string& mount_point, bool recursive = false) {
-    unsigned long mountflags = MS_SLAVE;
-    if (recursive) {
-        mountflags |= MS_REC;
-    }
-    if (mount(nullptr, mount_point.c_str(), nullptr, mountflags, nullptr) == -1) {
-        PLOG(ERROR) << "Failed to change propagation type to slave";
-        return false;
-    }
-    return true;
-}
-
-static bool MakePrivate(const std::string& mount_point, bool recursive = false) {
-    unsigned long mountflags = MS_PRIVATE;
-    if (recursive) {
-        mountflags |= MS_REC;
-    }
-    if (mount(nullptr, mount_point.c_str(), nullptr, mountflags, nullptr) == -1) {
-        PLOG(ERROR) << "Failed to change propagation type to private";
+        PLOG(ERROR) << "Failed to remount " << mount_point << " as " << std::hex << mountflags;
         return false;
     }
     return true;
@@ -225,17 +192,17 @@
     // needed for /foo/bar, then we will make /foo/bar as a mount point (by
     // bind-mounting by to itself) and set the propagation type of the mount
     // point to private.
-    if (!MakeShared("/", true /*recursive*/)) return false;
+    if (!ChangeMount("/", MS_SHARED | MS_REC)) return false;
 
     // /apex is a private mountpoint to give different sets of APEXes for
     // the bootstrap and default mount namespaces. The processes running with
     // the bootstrap namespace get APEXes from the read-only partition.
-    if (!(MakePrivate("/apex"))) return false;
+    if (!(ChangeMount("/apex", MS_PRIVATE))) return false;
 
     // /linkerconfig is a private mountpoint to give a different linker configuration
     // based on the mount namespace. Subdirectory will be bind-mounted based on current mount
     // namespace
-    if (!(MakePrivate("/linkerconfig"))) return false;
+    if (!(ChangeMount("/linkerconfig", MS_PRIVATE))) return false;
 
     // The two mount namespaces present challenges for scoped storage, because
     // vold, which is responsible for most of the mounting, lives in the
@@ -266,15 +233,15 @@
     if (!mkdir_recursive("/mnt/user", 0755)) return false;
     if (!mkdir_recursive("/mnt/installer", 0755)) return false;
     if (!mkdir_recursive("/mnt/androidwritable", 0755)) return false;
-    if (!(BindMount("/mnt/user", "/mnt/installer", true))) return false;
-    if (!(BindMount("/mnt/user", "/mnt/androidwritable", true))) return false;
+    if (!(BindMount("/mnt/user", "/mnt/installer"))) return false;
+    if (!(BindMount("/mnt/user", "/mnt/androidwritable"))) return false;
     // First, make /mnt/installer and /mnt/androidwritable a slave bind mount
-    if (!(MakeSlave("/mnt/installer"))) return false;
-    if (!(MakeSlave("/mnt/androidwritable"))) return false;
+    if (!(ChangeMount("/mnt/installer", MS_SLAVE))) return false;
+    if (!(ChangeMount("/mnt/androidwritable", MS_SLAVE))) return false;
     // Then, make it shared again - effectively creating a new peer group, that
     // will be inherited by new mount namespaces.
-    if (!(MakeShared("/mnt/installer"))) return false;
-    if (!(MakeShared("/mnt/androidwritable"))) return false;
+    if (!(ChangeMount("/mnt/installer", MS_SHARED))) return false;
+    if (!(ChangeMount("/mnt/androidwritable", MS_SHARED))) return false;
 
     bootstrap_ns_fd.reset(OpenMountNamespace());
     bootstrap_ns_id = GetMountNamespaceId();
diff --git a/init/perfboot.py b/init/perfboot.py
index 713290b..4b23ad2 100755
--- a/init/perfboot.py
+++ b/init/perfboot.py
@@ -349,9 +349,9 @@
     # Filter out invalid data.
     end_times = [get_last_value(record, end_tag) for record in record_list
                  if get_last_value(record, end_tag) != 0]
-    print 'mean: ', mean(end_times)
-    print 'median:', median(end_times)
-    print 'standard deviation:', stddev(end_times)
+    print 'mean:', int(round(mean(end_times))), 'ms'
+    print 'median:', int(round(median(end_times))), 'ms'
+    print 'standard deviation:', int(round(stddev(end_times))), 'ms'
 
 
 def do_iteration(device, interval_adjuster, event_tags_re, end_tag):
diff --git a/init/property_service.cpp b/init/property_service.cpp
index 0c4a3c4..a1e0969 100644
--- a/init/property_service.cpp
+++ b/init/property_service.cpp
@@ -632,10 +632,11 @@
     char *key, *value, *eol, *sol, *tmp, *fn;
     size_t flen = 0;
 
-    static constexpr const char* const kVendorPathPrefixes[3] = {
+    static constexpr const char* const kVendorPathPrefixes[4] = {
             "/vendor",
             "/odm",
             "/vendor_dlkm",
+            "/odm_dlkm",
     };
 
     const char* context = kInitContext;
@@ -941,6 +942,7 @@
     // }
     load_properties_from_file("/vendor/build.prop", nullptr, &properties);
     load_properties_from_file("/vendor_dlkm/etc/build.prop", nullptr, &properties);
+    load_properties_from_file("/odm_dlkm/etc/build.prop", nullptr, &properties);
     load_properties_from_partition("odm", /* support_legacy_path_until */ 28);
     load_properties_from_partition("product", /* support_legacy_path_until */ 30);
 
@@ -992,7 +994,7 @@
                                       &property_infos)) {
             return;
         }
-        // Don't check for failure here, so we always have a sane list of properties.
+        // Don't check for failure here, since we don't always have all of these partitions.
         // E.g. In case of recovery, the vendor partition will not have mounted and we
         // still need the system / platform properties to function.
         if (access("/system_ext/etc/selinux/system_ext_property_contexts", R_OK) != -1) {
diff --git a/init/service_utils.cpp b/init/service_utils.cpp
index 05e632b..f2383d7 100644
--- a/init/service_utils.cpp
+++ b/init/service_utils.cpp
@@ -60,13 +60,14 @@
 Result<void> SetUpMountNamespace(bool remount_proc, bool remount_sys) {
     constexpr unsigned int kSafeFlags = MS_NODEV | MS_NOEXEC | MS_NOSUID;
 
-    // Recursively remount / as slave like zygote does so unmounting and mounting /proc
-    // doesn't interfere with the parent namespace's /proc mount. This will also
-    // prevent any other mounts/unmounts initiated by the service from interfering
-    // with the parent namespace but will still allow mount events from the parent
+    // Recursively remount / as MS_SLAVE like zygote does so that
+    // unmounting and mounting /proc doesn't interfere with the parent
+    // namespace's /proc mount. This will also prevent any other
+    // mounts/unmounts initiated by the service from interfering with the
+    // parent namespace but will still allow mount events from the parent
     // namespace to propagate to the child.
     if (mount("rootfs", "/", nullptr, (MS_SLAVE | MS_REC), nullptr) == -1) {
-        return ErrnoError() << "Could not remount(/) recursively as slave";
+        return ErrnoError() << "Could not remount(/) recursively as MS_SLAVE";
     }
 
     // umount() then mount() /proc and/or /sys
diff --git a/init/test_kill_services/init_kill_services_test.cpp b/init/test_kill_services/init_kill_services_test.cpp
index 7e543f2..66a3328 100644
--- a/init/test_kill_services/init_kill_services_test.cpp
+++ b/init/test_kill_services/init_kill_services_test.cpp
@@ -54,7 +54,7 @@
 TEST_P(InitKillServicesTest, KillCriticalProcesses) {
     ExpectKillingServiceRecovers(GetParam());
 
-    // sanity check init is still responding
+    // Ensure that init is still responding
     EXPECT_TRUE(SetProperty("test.death.test", "asdf"));
     EXPECT_EQ(GetProperty("test.death.test", ""), "asdf");
     EXPECT_TRUE(SetProperty("test.death.test", ""));
diff --git a/init/uevent_listener.cpp b/init/uevent_listener.cpp
index d8d9b36..7cd396a 100644
--- a/init/uevent_listener.cpp
+++ b/init/uevent_listener.cpp
@@ -95,20 +95,18 @@
     fcntl(device_fd_, F_SETFL, O_NONBLOCK);
 }
 
-bool UeventListener::ReadUevent(Uevent* uevent) const {
+ReadUeventResult UeventListener::ReadUevent(Uevent* uevent) const {
     char msg[UEVENT_MSG_LEN + 2];
     int n = uevent_kernel_multicast_recv(device_fd_, msg, UEVENT_MSG_LEN);
     if (n <= 0) {
         if (errno != EAGAIN && errno != EWOULDBLOCK) {
             PLOG(ERROR) << "Error reading from Uevent Fd";
         }
-        return false;
+        return ReadUeventResult::kFailed;
     }
     if (n >= UEVENT_MSG_LEN) {
         LOG(ERROR) << "Uevent overflowed buffer, discarding";
-        // Return true here even if we discard as we may have more uevents pending and we
-        // want to keep processing them.
-        return true;
+        return ReadUeventResult::kInvalid;
     }
 
     msg[n] = '\0';
@@ -116,7 +114,7 @@
 
     ParseEvent(msg, uevent);
 
-    return true;
+    return ReadUeventResult::kSuccess;
 }
 
 // RegenerateUevents*() walks parts of the /sys tree and pokes the uevent files to cause the kernel
@@ -137,7 +135,10 @@
         close(fd);
 
         Uevent uevent;
-        while (ReadUevent(&uevent)) {
+        ReadUeventResult result;
+        while ((result = ReadUevent(&uevent)) != ReadUeventResult::kFailed) {
+            // Skip processing the uevent if it is invalid.
+            if (result == ReadUeventResult::kInvalid) continue;
             if (callback(uevent) == ListenerAction::kStop) return ListenerAction::kStop;
         }
     }
@@ -212,7 +213,10 @@
             // We're non-blocking, so if we receive a poll event keep processing until
             // we have exhausted all uevent messages.
             Uevent uevent;
-            while (ReadUevent(&uevent)) {
+            ReadUeventResult result;
+            while ((result = ReadUevent(&uevent)) != ReadUeventResult::kFailed) {
+                // Skip processing the uevent if it is invalid.
+                if (result == ReadUeventResult::kInvalid) continue;
                 if (callback(uevent) == ListenerAction::kStop) return;
             }
         }
diff --git a/init/uevent_listener.h b/init/uevent_listener.h
index aea094e..2772860 100644
--- a/init/uevent_listener.h
+++ b/init/uevent_listener.h
@@ -27,7 +27,7 @@
 
 #include "uevent.h"
 
-#define UEVENT_MSG_LEN 2048
+#define UEVENT_MSG_LEN 8192
 
 namespace android {
 namespace init {
@@ -37,6 +37,12 @@
     kContinue,  // Continue regenerating uevents as we haven't seen the one(s) we're interested in.
 };
 
+enum class ReadUeventResult {
+    kSuccess = 0,  // Uevent was successfully read.
+    kFailed,       // Uevent reading has failed.
+    kInvalid,      // An Invalid Uevent was read (like say, the msg received is >= UEVENT_MSG_LEN).
+};
+
 using ListenerCallback = std::function<ListenerAction(const Uevent&)>;
 
 class UeventListener {
@@ -50,7 +56,7 @@
               const std::optional<std::chrono::milliseconds> relative_timeout = {}) const;
 
   private:
-    bool ReadUevent(Uevent* uevent) const;
+    ReadUeventResult ReadUevent(Uevent* uevent) const;
     ListenerAction RegenerateUeventsForDir(DIR* d, const ListenerCallback& callback) const;
 
     android::base::unique_fd device_fd_;
diff --git a/libbacktrace/backtrace_test.cpp b/libbacktrace/backtrace_test.cpp
index f4191b9..cc32b6d 100644
--- a/libbacktrace/backtrace_test.cpp
+++ b/libbacktrace/backtrace_test.cpp
@@ -1584,7 +1584,7 @@
   // Verify the flag is set.
   ASSERT_EQ(PROT_DEVICE_MAP, map.flags & PROT_DEVICE_MAP);
 
-  // Quick sanity checks.
+  // Quick basic checks of functionality.
   uint64_t offset;
   ASSERT_EQ(std::string(""), backtrace->GetFunctionName(device_map_uint, &offset));
   ASSERT_EQ(std::string(""), backtrace->GetFunctionName(device_map_uint, &offset, &map));
diff --git a/libcutils/ashmem-dev.cpp b/libcutils/ashmem-dev.cpp
index 8c232f0..20cd659 100644
--- a/libcutils/ashmem-dev.cpp
+++ b/libcutils/ashmem-dev.cpp
@@ -122,7 +122,8 @@
         return true;
     }
 
-    /* If its not a number, assume string, but check if its a sane string */
+    // Non-numeric should be a single ASCII character. Characters after the
+    // first are ignored.
     if (tolower(vndk_version[0]) < 'a' || tolower(vndk_version[0]) > 'z') {
         ALOGE("memfd: ro.vndk.version not defined or invalid (%s), this is mandated since P.\n",
               vndk_version.c_str());
diff --git a/libcutils/fs_config.cpp b/libcutils/fs_config.cpp
index 5805a4d..b9fc82e 100644
--- a/libcutils/fs_config.cpp
+++ b/libcutils/fs_config.cpp
@@ -203,6 +203,7 @@
     { 00755, AID_ROOT,      AID_ROOT,      0, "first_stage_ramdisk/system/bin/e2fsck" },
     { 00755, AID_ROOT,      AID_ROOT,      0, "first_stage_ramdisk/system/bin/tune2fs" },
     { 00755, AID_ROOT,      AID_ROOT,      0, "first_stage_ramdisk/system/bin/resize2fs" },
+    { 00755, AID_ROOT,      AID_ROOT,      0, "first_stage_ramdisk/system/bin/snapuserd" },
     // generic defaults
     { 00755, AID_ROOT,      AID_ROOT,      0, "bin/*" },
     { 00640, AID_ROOT,      AID_SHELL,     0, "fstab.*" },
diff --git a/libcutils/include/private/android_filesystem_config.h b/libcutils/include/private/android_filesystem_config.h
index e4f45a8..b4fe2e6 100644
--- a/libcutils/include/private/android_filesystem_config.h
+++ b/libcutils/include/private/android_filesystem_config.h
@@ -36,7 +36,7 @@
 
 #pragma once
 
-/* This is the master Users and Groups config for the platform.
+/* This is the main Users and Groups config for the platform.
  * DO NOT EVER RENUMBER
  */
 
diff --git a/libcutils/qtaguid.cpp b/libcutils/qtaguid.cpp
index b94d134..2fe877c 100644
--- a/libcutils/qtaguid.cpp
+++ b/libcutils/qtaguid.cpp
@@ -38,24 +38,24 @@
     int (*netdDeleteTagData)(uint32_t, uid_t);
 };
 
-int dummyTagSocket(int, uint32_t, uid_t) {
+int stubTagSocket(int, uint32_t, uid_t) {
     return -EREMOTEIO;
 }
 
-int dummyUntagSocket(int) {
+int stubUntagSocket(int) {
     return -EREMOTEIO;
 }
 
-int dummySetCounterSet(uint32_t, uid_t) {
+int stubSetCounterSet(uint32_t, uid_t) {
     return -EREMOTEIO;
 }
 
-int dummyDeleteTagData(uint32_t, uid_t) {
+int stubDeleteTagData(uint32_t, uid_t) {
     return -EREMOTEIO;
 }
 
 netdHandler initHandler(void) {
-    netdHandler handler = {dummyTagSocket, dummyUntagSocket, dummySetCounterSet, dummyDeleteTagData};
+    netdHandler handler = {stubTagSocket, stubUntagSocket, stubSetCounterSet, stubDeleteTagData};
 
     void* netdClientHandle = dlopen("libnetd_client.so", RTLD_NOW);
     if (!netdClientHandle) {
diff --git a/libkeyutils/keyutils_test.cpp b/libkeyutils/keyutils_test.cpp
index d41c91b..d03747b 100644
--- a/libkeyutils/keyutils_test.cpp
+++ b/libkeyutils/keyutils_test.cpp
@@ -33,7 +33,7 @@
 #include <gtest/gtest.h>
 
 TEST(keyutils, smoke) {
-  // Check that the exported type is sane.
+  // Check that the exported type is the right size.
   ASSERT_EQ(4U, sizeof(key_serial_t));
 
   // Check that all the functions actually exist.
diff --git a/liblog/include/log/log_properties.h b/liblog/include/log/log_properties.h
index 3497d63..2a0230f 100644
--- a/liblog/include/log/log_properties.h
+++ b/liblog/include/log/log_properties.h
@@ -20,6 +20,7 @@
 extern "C" {
 #endif
 
+/* Returns `1` if the device is debuggable or `0` if not. */
 int __android_log_is_debuggable();
 
 #ifdef __cplusplus
diff --git a/liblog/include/log/log_read.h b/liblog/include/log/log_read.h
index 23d76f4..1736934 100644
--- a/liblog/include/log/log_read.h
+++ b/liblog/include/log/log_read.h
@@ -81,10 +81,17 @@
 
 log_id_t android_logger_get_id(struct logger* logger);
 
+/* Clears the given log buffer. */
 int android_logger_clear(struct logger* logger);
+/* Return the allotted size for the given log buffer. */
 long android_logger_get_log_size(struct logger* logger);
+/* Set the allotted size for the given log buffer. */
 int android_logger_set_log_size(struct logger* logger, unsigned long size);
+/* Return the actual, uncompressed size that can be read from the given log buffer. */
 long android_logger_get_log_readable_size(struct logger* logger);
+/* Return the actual, compressed size that the given log buffer is consuming. */
+long android_logger_get_log_consumed_size(struct logger* logger);
+/* Deprecated.  Always returns '4' regardless of input. */
 int android_logger_get_log_version(struct logger* logger);
 
 struct logger_list;
diff --git a/liblog/include/private/android_logger.h b/liblog/include/private/android_logger.h
index d3b72bc..166f387 100644
--- a/liblog/include/private/android_logger.h
+++ b/liblog/include/private/android_logger.h
@@ -144,21 +144,6 @@
 int __android_log_security_bswrite(int32_t tag, const char* payload);
 int __android_log_security(); /* Device Owner is present */
 
-#define BOOL_DEFAULT_FLAG_TRUE_FALSE 0x1
-#define BOOL_DEFAULT_FALSE 0x0        /* false if property not present   */
-#define BOOL_DEFAULT_TRUE 0x1         /* true if property not present    */
-#define BOOL_DEFAULT_FLAG_PERSIST 0x2 /* <key>, persist.<key>, ro.<key>  */
-#define BOOL_DEFAULT_FLAG_ENG 0x4     /* off for user                    */
-#define BOOL_DEFAULT_FLAG_SVELTE 0x8  /* off for low_ram                 */
-bool __android_logger_property_get_bool(const char* key, int flag);
-
-#define LOG_BUFFER_SIZE (256 * 1024) /* Tuned with ro.logd.size per-platform \
-                                      */
-#define LOG_BUFFER_MIN_SIZE (64 * 1024UL)
-#define LOG_BUFFER_MAX_SIZE (256 * 1024 * 1024UL)
-unsigned long __android_logger_get_buffer_size(log_id_t logId);
-bool __android_logger_valid_buffer_size(unsigned long value);
-
 /* Retrieve the composed event buffer */
 int android_log_write_list_buffer(android_log_context ctx, const char** msg);
 
diff --git a/liblog/liblog.map.txt b/liblog/liblog.map.txt
index 161fcf1..8beb679 100644
--- a/liblog/liblog.map.txt
+++ b/liblog/liblog.map.txt
@@ -84,8 +84,6 @@
   global:
     __android_log_pmsg_file_read;
     __android_log_pmsg_file_write;
-    __android_logger_get_buffer_size;
-    __android_logger_property_get_bool;
     android_openEventTagMap;
     android_log_processBinaryLogBuffer;
     android_log_processLogBuffer;
diff --git a/liblog/logd_reader.cpp b/liblog/logd_reader.cpp
index 82ed6b2..611caed 100644
--- a/liblog/logd_reader.cpp
+++ b/liblog/logd_reader.cpp
@@ -35,13 +35,14 @@
 
 #include <string>
 
+#include <android-base/parseint.h>
 #include <private/android_logger.h>
 
 #include "logger.h"
 
 // Connects to /dev/socket/<name> and returns the associated fd or returns -1 on error.
 // O_CLOEXEC is always set.
-static int socket_local_client(const std::string& name, int type) {
+static int socket_local_client(const std::string& name, int type, bool timeout) {
   sockaddr_un addr = {.sun_family = AF_LOCAL};
 
   std::string path = "/dev/socket/" + name;
@@ -55,6 +56,18 @@
     return -1;
   }
 
+  if (timeout) {
+    // Sending and receiving messages should be instantaneous, but we don't want to wait forever if
+    // logd is hung, so we set a gracious 2s timeout.
+    struct timeval t = {2, 0};
+    if (setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &t, sizeof(t)) == -1) {
+      return -1;
+    }
+    if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &t, sizeof(t)) == -1) {
+      return -1;
+    }
+  }
+
   if (connect(fd, reinterpret_cast<sockaddr*>(&addr), sizeof(addr)) == -1) {
     close(fd);
     return -1;
@@ -69,7 +82,7 @@
   size_t len;
   char* cp;
   int errno_save = 0;
-  int sock = socket_local_client("logd", SOCK_STREAM);
+  int sock = socket_local_client("logd", SOCK_STREAM, true);
   if (sock < 0) {
     return sock;
   }
@@ -148,26 +161,56 @@
   return check_log_success(buf, SendLogdControlMessage(buf, sizeof(buf)));
 }
 
-/* returns the total size of the log's ring buffer */
-long android_logger_get_log_size(struct logger* logger) {
+enum class LogSizeType : uint32_t {
+  kAllotted = 0,
+  kReadable,
+  kConsumed,
+};
+
+static long GetLogSize(struct logger* logger, LogSizeType type) {
   if (!android_logger_is_logd(logger)) {
     return -EINVAL;
   }
 
   uint32_t log_id = android_logger_get_id(logger);
   char buf[512];
-  snprintf(buf, sizeof(buf), "getLogSize %" PRIu32, log_id);
+  switch (type) {
+    case LogSizeType::kAllotted:
+      snprintf(buf, sizeof(buf), "getLogSize %" PRIu32, log_id);
+      break;
+    case LogSizeType::kReadable:
+      snprintf(buf, sizeof(buf), "getLogSizeReadable %" PRIu32, log_id);
+      break;
+    case LogSizeType::kConsumed:
+      snprintf(buf, sizeof(buf), "getLogSizeUsed %" PRIu32, log_id);
+      break;
+    default:
+      abort();
+  }
 
   ssize_t ret = SendLogdControlMessage(buf, sizeof(buf));
   if (ret < 0) {
     return ret;
   }
 
-  if ((buf[0] < '0') || ('9' < buf[0])) {
+  long size;
+  if (!android::base::ParseInt(buf, &size)) {
     return -1;
   }
 
-  return atol(buf);
+  return size;
+}
+
+long android_logger_get_log_size(struct logger* logger) {
+  return GetLogSize(logger, LogSizeType::kAllotted);
+}
+
+long android_logger_get_log_readable_size(struct logger* logger) {
+  return GetLogSize(logger, LogSizeType::kReadable);
+}
+
+long android_logger_get_log_consumed_size(struct logger* logger) {
+  return GetLogSize(logger, LogSizeType::kConsumed);
 }
 
 int android_logger_set_log_size(struct logger* logger, unsigned long size) {
@@ -182,31 +225,6 @@
   return check_log_success(buf, SendLogdControlMessage(buf, sizeof(buf)));
 }
 
-/*
- * returns the readable size of the log's ring buffer (that is, amount of the
- * log consumed)
- */
-long android_logger_get_log_readable_size(struct logger* logger) {
-  if (!android_logger_is_logd(logger)) {
-    return -EINVAL;
-  }
-
-  uint32_t log_id = android_logger_get_id(logger);
-  char buf[512];
-  snprintf(buf, sizeof(buf), "getLogSizeUsed %" PRIu32, log_id);
-
-  ssize_t ret = SendLogdControlMessage(buf, sizeof(buf));
-  if (ret < 0) {
-    return ret;
-  }
-
-  if ((buf[0] < '0') || ('9' < buf[0])) {
-    return -1;
-  }
-
-  return atol(buf);
-}
-
 int android_logger_get_log_version(struct logger*) {
   return 4;
 }
@@ -268,7 +286,7 @@
     return sock;
   }
 
-  sock = socket_local_client("logdr", SOCK_SEQPACKET);
+  sock = socket_local_client("logdr", SOCK_SEQPACKET, false);
   if (sock <= 0) {
     if ((sock == -1) && errno) {
       return -errno;
diff --git a/liblog/properties.cpp b/liblog/properties.cpp
index 2392112..88f0bf1 100644
--- a/liblog/properties.cpp
+++ b/liblog/properties.cpp
@@ -294,33 +294,12 @@
 }
 
 int __android_log_is_debuggable() {
-  static uint32_t serial;
-  static struct cache_char tag_cache;
-  static const char key[] = "ro.debuggable";
-  int ret;
+  static int is_debuggable = [] {
+    char value[PROP_VALUE_MAX] = {};
+    return __system_property_get("ro.debuggable", value) > 0 && !strcmp(value, "1");
+  }();
 
-  if (tag_cache.c) { /* ro property does not change after set */
-    ret = tag_cache.c == '1';
-  } else if (lock()) {
-    struct cache_char temp_cache = {{NULL, 0xFFFFFFFF}, '\0'};
-    refresh_cache(&temp_cache, key);
-    ret = temp_cache.c == '1';
-  } else {
-    int change_detected = check_cache(&tag_cache.cache);
-    uint32_t current_serial = __system_property_area_serial();
-    if (current_serial != serial) {
-      change_detected = 1;
-    }
-    if (change_detected) {
-      refresh_cache(&tag_cache, key);
-      serial = current_serial;
-    }
-    ret = tag_cache.c == '1';
-
-    unlock();
-  }
-
-  return ret;
+  return is_debuggable;
 }
 
 /*
@@ -385,216 +364,6 @@
   return do_cache2_char(&security);
 }
 
-/*
- * Interface that represents the logd buffer size determination so that others
- * need not guess our intentions.
- */
-
-/* Property helper */
-static bool check_flag(const char* prop, const char* flag) {
-  const char* cp = strcasestr(prop, flag);
-  if (!cp) {
-    return false;
-  }
-  /* We only will document comma (,) */
-  static const char sep[] = ",:;|+ \t\f";
-  if ((cp != prop) && !strchr(sep, cp[-1])) {
-    return false;
-  }
-  cp += strlen(flag);
-  return !*cp || !!strchr(sep, *cp);
-}
-
-/* cache structure */
-struct cache_property {
-  struct cache cache;
-  char property[PROP_VALUE_MAX];
-};
-
-static void refresh_cache_property(struct cache_property* cache, const char* key) {
-  if (!cache->cache.pinfo) {
-    cache->cache.pinfo = __system_property_find(key);
-    if (!cache->cache.pinfo) {
-      return;
-    }
-  }
-  cache->cache.serial = __system_property_serial(cache->cache.pinfo);
-  __system_property_read(cache->cache.pinfo, 0, cache->property);
-}
-
-/* get boolean with the logger twist that supports eng adjustments */
-bool __android_logger_property_get_bool(const char* key, int flag) {
-  struct cache_property property = {{NULL, 0xFFFFFFFF}, {0}};
-  if (flag & BOOL_DEFAULT_FLAG_PERSIST) {
-    char newkey[strlen("persist.") + strlen(key) + 1];
-    snprintf(newkey, sizeof(newkey), "ro.%s", key);
-    refresh_cache_property(&property, newkey);
-    property.cache.pinfo = NULL;
-    property.cache.serial = 0xFFFFFFFF;
-    snprintf(newkey, sizeof(newkey), "persist.%s", key);
-    refresh_cache_property(&property, newkey);
-    property.cache.pinfo = NULL;
-    property.cache.serial = 0xFFFFFFFF;
-  }
-
-  refresh_cache_property(&property, key);
-
-  if (check_flag(property.property, "true")) {
-    return true;
-  }
-  if (check_flag(property.property, "false")) {
-    return false;
-  }
-  if (property.property[0]) {
-    flag &= ~(BOOL_DEFAULT_FLAG_ENG | BOOL_DEFAULT_FLAG_SVELTE);
-  }
-  if (check_flag(property.property, "eng")) {
-    flag |= BOOL_DEFAULT_FLAG_ENG;
-  }
-  /* this is really a "not" flag */
-  if (check_flag(property.property, "svelte")) {
-    flag |= BOOL_DEFAULT_FLAG_SVELTE;
-  }
-
-  /* Sanity Check */
-  if (flag & (BOOL_DEFAULT_FLAG_SVELTE | BOOL_DEFAULT_FLAG_ENG)) {
-    flag &= ~BOOL_DEFAULT_FLAG_TRUE_FALSE;
-    flag |= BOOL_DEFAULT_TRUE;
-  }
-
-  if ((flag & BOOL_DEFAULT_FLAG_SVELTE) &&
-      __android_logger_property_get_bool("ro.config.low_ram", BOOL_DEFAULT_FALSE)) {
-    return false;
-  }
-  if ((flag & BOOL_DEFAULT_FLAG_ENG) && !__android_log_is_debuggable()) {
-    return false;
-  }
-
-  return (flag & BOOL_DEFAULT_FLAG_TRUE_FALSE) != BOOL_DEFAULT_FALSE;
-}
-
-bool __android_logger_valid_buffer_size(unsigned long value) {
-  return LOG_BUFFER_MIN_SIZE <= value && value <= LOG_BUFFER_MAX_SIZE;
-}
-
-struct cache2_property_size {
-  pthread_mutex_t lock;
-  uint32_t serial;
-  const char* key_persist;
-  struct cache_property cache_persist;
-  const char* key_ro;
-  struct cache_property cache_ro;
-  unsigned long (*const evaluate)(const struct cache2_property_size* self);
-};
-
-static inline unsigned long do_cache2_property_size(struct cache2_property_size* self) {
-  uint32_t current_serial;
-  int change_detected;
-  unsigned long v;
-
-  if (pthread_mutex_trylock(&self->lock)) {
-    /* We are willing to accept some race in this context */
-    return self->evaluate(self);
-  }
-
-  change_detected = check_cache(&self->cache_persist.cache) || check_cache(&self->cache_ro.cache);
-  current_serial = __system_property_area_serial();
-  if (current_serial != self->serial) {
-    change_detected = 1;
-  }
-  if (change_detected) {
-    refresh_cache_property(&self->cache_persist, self->key_persist);
-    refresh_cache_property(&self->cache_ro, self->key_ro);
-    self->serial = current_serial;
-  }
-  v = self->evaluate(self);
-
-  pthread_mutex_unlock(&self->lock);
-
-  return v;
-}
-
-static unsigned long property_get_size_from_cache(const struct cache_property* cache) {
-  char* cp;
-  unsigned long value = strtoul(cache->property, &cp, 10);
-
-  switch (*cp) {
-    case 'm':
-    case 'M':
-      value *= 1024;
-      [[fallthrough]];
-    case 'k':
-    case 'K':
-      value *= 1024;
-      [[fallthrough]];
-    case '\0':
-      break;
-
-    default:
-      value = 0;
-  }
-
-  if (!__android_logger_valid_buffer_size(value)) {
-    value = 0;
-  }
-
-  return value;
-}
-
-static unsigned long evaluate_property_get_size(const struct cache2_property_size* self) {
-  unsigned long size = property_get_size_from_cache(&self->cache_persist);
-  if (size) {
-    return size;
-  }
-  return property_get_size_from_cache(&self->cache_ro);
-}
-
-unsigned long __android_logger_get_buffer_size(log_id_t logId) {
-  static const char global_tunable[] = "persist.logd.size"; /* Settings App */
-  static const char global_default[] = "ro.logd.size";      /* BoardConfig.mk */
-  static struct cache2_property_size global = {
-      /* clang-format off */
-    PTHREAD_MUTEX_INITIALIZER, 0,
-    global_tunable, { { NULL, 0xFFFFFFFF }, {} },
-    global_default, { { NULL, 0xFFFFFFFF }, {} },
-    evaluate_property_get_size
-      /* clang-format on */
-  };
-  char key_persist[strlen(global_tunable) + strlen(".security") + 1];
-  char key_ro[strlen(global_default) + strlen(".security") + 1];
-  struct cache2_property_size local = {
-      /* clang-format off */
-    PTHREAD_MUTEX_INITIALIZER, 0,
-    key_persist, { { NULL, 0xFFFFFFFF }, {} },
-    key_ro,      { { NULL, 0xFFFFFFFF }, {} },
-    evaluate_property_get_size
-      /* clang-format on */
-  };
-  unsigned long property_size, default_size;
-
-  default_size = do_cache2_property_size(&global);
-  if (!default_size) {
-    default_size = __android_logger_property_get_bool("ro.config.low_ram", BOOL_DEFAULT_FALSE)
-                       ? LOG_BUFFER_MIN_SIZE /* 64K  */
-                       : LOG_BUFFER_SIZE;    /* 256K */
-  }
-
-  snprintf(key_persist, sizeof(key_persist), "%s.%s", global_tunable,
-           android_log_id_to_name(logId));
-  snprintf(key_ro, sizeof(key_ro), "%s.%s", global_default, android_log_id_to_name(logId));
-  property_size = do_cache2_property_size(&local);
-
-  if (!property_size) {
-    property_size = default_size;
-  }
-
-  if (!property_size) {
-    property_size = LOG_BUFFER_SIZE;
-  }
-
-  return property_size;
-}
-
 #else
 
 int __android_log_is_loggable(int prio, const char*, int) {
@@ -613,4 +382,4 @@
   return 1;
 }
 
-#endif
\ No newline at end of file
+#endif
diff --git a/liblog/tests/Android.bp b/liblog/tests/Android.bp
index 2a6424b..a17d90c 100644
--- a/liblog/tests/Android.bp
+++ b/liblog/tests/Android.bp
@@ -97,6 +97,7 @@
     cflags: ["-DNO_PSTORE"],
     test_suites: [
         "cts",
+        "device-tests",
         "vts10",
     ],
 }
diff --git a/liblog/tests/liblog_global_state.cpp b/liblog/tests/liblog_global_state.cpp
index 3508818..1d7ff9f 100644
--- a/liblog/tests/liblog_global_state.cpp
+++ b/liblog/tests/liblog_global_state.cpp
@@ -153,56 +153,65 @@
   message_seen = false;
 }
 
+static std::string UniqueLogTag() {
+  std::string tag = LOG_TAG;
+  tag += "-" + std::to_string(getpid());
+  return tag;
+}
+
 TEST(liblog_global_state, is_loggable_both_default) {
-  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_INFO, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, LOG_TAG, ANDROID_LOG_INFO));
+  auto tag = UniqueLogTag();
+  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_DEBUG, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_INFO, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, tag.c_str(), ANDROID_LOG_INFO));
 }
 
 TEST(liblog_global_state, is_loggable_minimum_log_priority_only) {
-  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_INFO, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, LOG_TAG, ANDROID_LOG_INFO));
+  auto tag = UniqueLogTag();
+  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_DEBUG, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_INFO, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, tag.c_str(), ANDROID_LOG_INFO));
 
   EXPECT_EQ(ANDROID_LOG_DEFAULT, __android_log_set_minimum_priority(ANDROID_LOG_DEBUG));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_INFO, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, LOG_TAG, ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_DEBUG, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_INFO, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, tag.c_str(), ANDROID_LOG_INFO));
 
   EXPECT_EQ(ANDROID_LOG_DEBUG, __android_log_set_minimum_priority(ANDROID_LOG_WARN));
-  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_INFO, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, LOG_TAG, ANDROID_LOG_INFO));
+  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_DEBUG, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_INFO, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, tag.c_str(), ANDROID_LOG_INFO));
 
   EXPECT_EQ(android::base::WARNING, android::base::SetMinimumLogSeverity(android::base::DEBUG));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_INFO, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, LOG_TAG, ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_DEBUG, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_INFO, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, tag.c_str(), ANDROID_LOG_INFO));
 
   EXPECT_EQ(android::base::DEBUG, android::base::SetMinimumLogSeverity(android::base::WARNING));
-  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_INFO, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, LOG_TAG, ANDROID_LOG_INFO));
+  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_DEBUG, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_INFO, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, tag.c_str(), ANDROID_LOG_INFO));
 }
 
 TEST(liblog_global_state, is_loggable_tag_log_priority_only) {
 #ifdef __ANDROID__
-  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_INFO, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, LOG_TAG, ANDROID_LOG_INFO));
+  auto tag = UniqueLogTag();
+  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_DEBUG, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_INFO, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, tag.c_str(), ANDROID_LOG_INFO));
 
-  auto log_tag_property = std::string("log.tag.") + LOG_TAG;
-  android::base::SetProperty(log_tag_property, "d");
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_INFO, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, LOG_TAG, ANDROID_LOG_INFO));
+  auto log_tag_property = std::string("log.tag.") + tag;
+  ASSERT_TRUE(android::base::SetProperty(log_tag_property, "d"));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_DEBUG, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_INFO, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, tag.c_str(), ANDROID_LOG_INFO));
 
-  android::base::SetProperty(log_tag_property, "w");
-  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_INFO, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, LOG_TAG, ANDROID_LOG_INFO));
+  ASSERT_TRUE(android::base::SetProperty(log_tag_property, "w"));
+  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_DEBUG, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_INFO, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, tag.c_str(), ANDROID_LOG_INFO));
 
-  android::base::SetProperty(log_tag_property, "");
+  ASSERT_TRUE(android::base::SetProperty(log_tag_property, ""));
 #else
   GTEST_SKIP() << "No log tag properties on host";
 #endif
@@ -210,39 +219,40 @@
 
 TEST(liblog_global_state, is_loggable_both_set) {
 #ifdef __ANDROID__
-  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_INFO, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, LOG_TAG, ANDROID_LOG_INFO));
+  auto tag = UniqueLogTag();
+  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_DEBUG, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_INFO, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, tag.c_str(), ANDROID_LOG_INFO));
 
   // When both a tag and a minimum priority are set, we use the lower value of the two.
 
   // tag = warning, minimum_priority = debug, expect 'debug'
-  auto log_tag_property = std::string("log.tag.") + LOG_TAG;
-  android::base::SetProperty(log_tag_property, "w");
+  auto log_tag_property = std::string("log.tag.") + tag;
+  ASSERT_TRUE(android::base::SetProperty(log_tag_property, "w"));
   EXPECT_EQ(ANDROID_LOG_DEFAULT, __android_log_set_minimum_priority(ANDROID_LOG_DEBUG));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_INFO, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, LOG_TAG, ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_DEBUG, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_INFO, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, tag.c_str(), ANDROID_LOG_INFO));
 
   // tag = warning, minimum_priority = warning, expect 'warning'
   EXPECT_EQ(ANDROID_LOG_DEBUG, __android_log_set_minimum_priority(ANDROID_LOG_WARN));
-  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_INFO, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, LOG_TAG, ANDROID_LOG_INFO));
+  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_DEBUG, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(0, __android_log_is_loggable(ANDROID_LOG_INFO, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, tag.c_str(), ANDROID_LOG_INFO));
 
   // tag = debug, minimum_priority = warning, expect 'debug'
-  android::base::SetProperty(log_tag_property, "d");
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_INFO, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, LOG_TAG, ANDROID_LOG_INFO));
+  ASSERT_TRUE(android::base::SetProperty(log_tag_property, "d"));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_DEBUG, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_INFO, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, tag.c_str(), ANDROID_LOG_INFO));
 
   // tag = debug, minimum_priority = debug, expect 'debug'
   EXPECT_EQ(ANDROID_LOG_WARN, __android_log_set_minimum_priority(ANDROID_LOG_DEBUG));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_INFO, LOG_TAG, ANDROID_LOG_INFO));
-  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, LOG_TAG, ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_DEBUG, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_INFO, tag.c_str(), ANDROID_LOG_INFO));
+  EXPECT_EQ(1, __android_log_is_loggable(ANDROID_LOG_WARN, tag.c_str(), ANDROID_LOG_INFO));
 
-  android::base::SetProperty(log_tag_property, "");
+  ASSERT_TRUE(android::base::SetProperty(log_tag_property, ""));
 #else
   GTEST_SKIP() << "No log tag properties on host";
 #endif
diff --git a/liblog/tests/log_read_test.cpp b/liblog/tests/log_read_test.cpp
index 3e09617..7acd363 100644
--- a/liblog/tests/log_read_test.cpp
+++ b/liblog/tests/log_read_test.cpp
@@ -20,6 +20,7 @@
 
 #include <string>
 
+#include <android-base/properties.h>
 #include <android-base/stringprintf.h>
 #include <android/log.h>  // minimal logging API
 #include <gtest/gtest.h>
@@ -29,6 +30,8 @@
 // Do not use anything in log/log_time.h despite side effects of the above.
 #include <private/android_logger.h>
 
+using android::base::GetBoolProperty;
+
 TEST(liblog, android_logger_get_) {
 #ifdef __ANDROID__
   // This test assumes the log buffers are filled with noise from
@@ -38,31 +41,27 @@
 
   for (int i = LOG_ID_MIN; i < LOG_ID_MAX; ++i) {
     log_id_t id = static_cast<log_id_t>(i);
-    const char* name = android_log_id_to_name(id);
-    if (id != android_name_to_log_id(name)) {
-      continue;
-    }
-    fprintf(stderr, "log buffer %s\r", name);
+    std::string name = android_log_id_to_name(id);
+    fprintf(stderr, "log buffer %s\r", name.c_str());
     struct logger* logger;
     EXPECT_TRUE(NULL != (logger = android_logger_open(logger_list, id)));
     EXPECT_EQ(id, android_logger_get_id(logger));
     ssize_t get_log_size = android_logger_get_log_size(logger);
     /* security buffer is allowed to be denied */
-    if (strcmp("security", name)) {
-      EXPECT_LT(0, get_log_size);
+    if (name != "security") {
+      EXPECT_GT(get_log_size, 0);
       // crash buffer is allowed to be empty, that is actually healthy!
-      // kernel buffer is allowed to be empty on "user" builds
-      // stats buffer is allowed to be empty TEMPORARILY.
-      // TODO: remove stats buffer from here once we start to use it in
-      // framework (b/68266385).
-      EXPECT_LE(  // boolean 1 or 0 depending on expected content or empty
-          !!((strcmp("crash", name) != 0) &&
-             ((strcmp("kernel", name) != 0) ||
-              __android_logger_property_get_bool(
-                  "ro.logd.kernel", BOOL_DEFAULT_TRUE | BOOL_DEFAULT_FLAG_ENG |
-                                        BOOL_DEFAULT_FLAG_SVELTE)) &&
-             (strcmp("stats", name) != 0)),
-          android_logger_get_log_readable_size(logger));
+      // stats buffer is no longer in use.
+      if (name == "crash" || name == "stats") {
+        continue;
+      }
+
+      // kernel buffer is empty if ro.logd.kernel is false
+      if (name == "kernel" && !GetBoolProperty("ro.logd.kernel", false)) {
+        continue;
+      }
+
+      EXPECT_LE(0, android_logger_get_log_readable_size(logger));
     } else {
       EXPECT_NE(0, get_log_size);
       if (get_log_size < 0) {
@@ -71,7 +70,6 @@
         EXPECT_LE(0, android_logger_get_log_readable_size(logger));
       }
     }
-    EXPECT_LT(0, android_logger_get_log_version(logger));
   }
 
   android_logger_list_close(logger_list);
diff --git a/libmodprobe/libmodprobe.cpp b/libmodprobe/libmodprobe.cpp
index bbdd317..ceabf62 100644
--- a/libmodprobe/libmodprobe.cpp
+++ b/libmodprobe/libmodprobe.cpp
@@ -336,7 +336,6 @@
     }
 
     ParseKernelCmdlineOptions();
-    android::base::SetMinimumLogSeverity(android::base::INFO);
 }
 
 void Modprobe::EnableBlocklist(bool enable) {
diff --git a/libsysutils/src/NetlinkEvent.cpp b/libsysutils/src/NetlinkEvent.cpp
index 9c1621b..3b6cfd8 100644
--- a/libsysutils/src/NetlinkEvent.cpp
+++ b/libsysutils/src/NetlinkEvent.cpp
@@ -185,7 +185,6 @@
     if (!checkRtNetlinkLength(nh, sizeof(*ifaddr)))
         return false;
 
-    // Sanity check.
     int type = nh->nlmsg_type;
     if (type != RTM_NEWADDR && type != RTM_DELADDR) {
         SLOGE("parseIfAddrMessage on incorrect message type 0x%x\n", type);
@@ -349,7 +348,6 @@
     uint8_t type = nh->nlmsg_type;
     const char *msgname = rtMessageName(type);
 
-    // Sanity check.
     if (type != RTM_NEWROUTE && type != RTM_DELROUTE) {
         SLOGE("%s: incorrect message type %d (%s)\n", __func__, type, msgname);
         return false;
diff --git a/libsysutils/src/SocketClient.cpp b/libsysutils/src/SocketClient.cpp
index fe2f3d6..e90afcd 100644
--- a/libsysutils/src/SocketClient.cpp
+++ b/libsysutils/src/SocketClient.cpp
@@ -201,50 +201,31 @@
         return 0;
     }
 
-    int ret = 0;
-    int e = 0; // SLOGW and sigaction are not inert regarding errno
     int current = 0;
 
-    struct sigaction new_action, old_action;
-    memset(&new_action, 0, sizeof(new_action));
-    new_action.sa_handler = SIG_IGN;
-    sigaction(SIGPIPE, &new_action, &old_action);
-
     for (;;) {
-        ssize_t rc = TEMP_FAILURE_RETRY(
-            writev(mSocket, iov + current, iovcnt - current));
-
-        if (rc > 0) {
-            size_t written = rc;
-            while ((current < iovcnt) && (written >= iov[current].iov_len)) {
-                written -= iov[current].iov_len;
-                current++;
-            }
-            if (current == iovcnt) {
-                break;
-            }
-            iov[current].iov_base = (char *)iov[current].iov_base + written;
-            iov[current].iov_len -= written;
-            continue;
-        }
+        ssize_t rc = TEMP_FAILURE_RETRY(writev(mSocket, iov + current, iovcnt - current));
 
         if (rc == 0) {
-            e = EIO;
+            errno = EIO;
             SLOGW("0 length write :(");
-        } else {
-            e = errno;
-            SLOGW("write error (%s)", strerror(e));
+            return -1;
+        } else if (rc < 0) {
+            SLOGW("write error (%s)", strerror(errno));
+            return -1;
         }
-        ret = -1;
-        break;
-    }
 
-    sigaction(SIGPIPE, &old_action, &new_action);
-
-    if (e != 0) {
-        errno = e;
+        size_t written = rc;
+        while (current < iovcnt && written >= iov[current].iov_len) {
+            written -= iov[current].iov_len;
+            current++;
+        }
+        if (current == iovcnt) {
+            return 0;
+        }
+        iov[current].iov_base = (char*)iov[current].iov_base + written;
+        iov[current].iov_len -= written;
     }
-    return ret;
 }
 
 void SocketClient::incRef() {
diff --git a/libunwindstack/DwarfCfa.cpp b/libunwindstack/DwarfCfa.cpp
index c128b9b..c6db209 100644
--- a/libunwindstack/DwarfCfa.cpp
+++ b/libunwindstack/DwarfCfa.cpp
@@ -26,7 +26,9 @@
 
 #include <unwindstack/DwarfError.h>
 #include <unwindstack/DwarfLocation.h>
+#include <unwindstack/Elf.h>
 #include <unwindstack/Log.h>
+#include <unwindstack/MachineArm64.h>
 
 #include "DwarfCfa.h"
 #include "DwarfEncoding.h"
@@ -204,8 +206,12 @@
 bool DwarfCfa<AddressType>::LogInstruction(uint32_t indent, uint64_t cfa_offset, uint8_t op,
                                            uint64_t* cur_pc) {
   const auto* cfa = &DwarfCfaInfo::kTable[op];
-  if (cfa->name[0] == '\0') {
-    log(indent, "Illegal");
+  if (cfa->name[0] == '\0' || (arch_ != ARCH_ARM64 && op == 0x2d)) {
+    if (op == 0x2d) {
+      log(indent, "Illegal (Only valid on aarch64)");
+    } else {
+      log(indent, "Illegal");
+    }
     log(indent, "Raw Data: 0x%02x", op);
     return true;
   }
@@ -514,6 +520,24 @@
   return true;
 }
 
+template <typename AddressType>
+bool DwarfCfa<AddressType>::cfa_aarch64_negate_ra_state(dwarf_loc_regs_t* loc_regs) {
+  // Only supported on aarch64.
+  if (arch_ != ARCH_ARM64) {
+    last_error_.code = DWARF_ERROR_ILLEGAL_VALUE;
+    return false;
+  }
+
+  auto cfa_location = loc_regs->find(Arm64Reg::ARM64_PREG_RA_SIGN_STATE);
+  if (cfa_location == loc_regs->end()) {
+    (*loc_regs)[Arm64Reg::ARM64_PREG_RA_SIGN_STATE] = {.type = DWARF_LOCATION_PSEUDO_REGISTER,
+                                                       .values = {1}};
+  } else {
+    cfa_location->second.values[0] ^= 1;
+  }
+  return true;
+}
+
 const DwarfCfaInfo::Info DwarfCfaInfo::kTable[64] = {
     {
         // 0x00 DW_CFA_nop
@@ -699,7 +723,13 @@
     {"", 0, 0, {}, {}},  // 0x2a illegal cfa
     {"", 0, 0, {}, {}},  // 0x2b illegal cfa
     {"", 0, 0, {}, {}},  // 0x2c illegal cfa
-    {"", 0, 0, {}, {}},  // 0x2d DW_CFA_GNU_window_save (Treat as illegal)
+    {
+        "DW_CFA_AARCH64_negate_ra_state",  // 0x2d DW_CFA_AARCH64_negate_ra_state
+        3,
+        0,
+        {},
+        {},
+    },
     {
         "DW_CFA_GNU_args_size",  // 0x2e DW_CFA_GNU_args_size
         2,
diff --git a/libunwindstack/DwarfCfa.h b/libunwindstack/DwarfCfa.h
index 569c17c..d627e15 100644
--- a/libunwindstack/DwarfCfa.h
+++ b/libunwindstack/DwarfCfa.h
@@ -31,6 +31,9 @@
 
 namespace unwindstack {
 
+// Forward declarations.
+enum ArchEnum : uint8_t;
+
 // DWARF Standard home: http://dwarfstd.org/
 // This code is based on DWARF 4: http://http://dwarfstd.org/doc/DWARF4.pdf
 // See section 6.4.2.1 for a description of the DW_CFA_xxx values.
@@ -72,7 +75,8 @@
   typedef typename std::make_signed<AddressType>::type SignedType;
 
  public:
-  DwarfCfa(DwarfMemory* memory, const DwarfFde* fde) : memory_(memory), fde_(fde) {}
+  DwarfCfa(DwarfMemory* memory, const DwarfFde* fde, ArchEnum arch)
+      : memory_(memory), fde_(fde), arch_(arch) {}
   virtual ~DwarfCfa() = default;
 
   bool GetLocationInfo(uint64_t pc, uint64_t start_offset, uint64_t end_offset,
@@ -99,6 +103,7 @@
   DwarfErrorData last_error_;
   DwarfMemory* memory_;
   const DwarfFde* fde_;
+  ArchEnum arch_;
 
   AddressType cur_pc_;
   const dwarf_loc_regs_t* cie_loc_regs_ = nullptr;
@@ -128,6 +133,7 @@
   bool cfa_val_offset_sf(dwarf_loc_regs_t*);
   bool cfa_val_expression(dwarf_loc_regs_t*);
   bool cfa_gnu_negative_offset_extended(dwarf_loc_regs_t*);
+  bool cfa_aarch64_negate_ra_state(dwarf_loc_regs_t*);
 
   using process_func = bool (DwarfCfa::*)(dwarf_loc_regs_t*);
   constexpr static process_func kCallbackTable[64] = {
@@ -221,8 +227,9 @@
       nullptr,
       // 0x2c illegal cfa
       nullptr,
-      // 0x2d DW_CFA_GNU_window_save (Treat this as illegal)
-      nullptr,
+      // 0x2d DW_CFA_AARCH64_negate_ra_state (aarch64 only)
+      // DW_CFA_GNU_window_save on other architectures.
+      &DwarfCfa::cfa_aarch64_negate_ra_state,
       // 0x2e DW_CFA_GNU_args_size
       &DwarfCfa::cfa_nop,
       // 0x2f DW_CFA_GNU_negative_offset_extended
diff --git a/libunwindstack/DwarfSection.cpp b/libunwindstack/DwarfSection.cpp
index 18bd490..9e2a3cd 100644
--- a/libunwindstack/DwarfSection.cpp
+++ b/libunwindstack/DwarfSection.cpp
@@ -21,6 +21,7 @@
 #include <unwindstack/DwarfMemory.h>
 #include <unwindstack/DwarfSection.h>
 #include <unwindstack/DwarfStructs.h>
+#include <unwindstack/Elf.h>
 #include <unwindstack/Log.h>
 #include <unwindstack/Memory.h>
 #include <unwindstack/Regs.h>
@@ -49,7 +50,7 @@
 
     // Now get the location information for this pc.
     dwarf_loc_regs_t loc_regs;
-    if (!GetCfaLocationInfo(pc, fde, &loc_regs)) {
+    if (!GetCfaLocationInfo(pc, fde, &loc_regs, regs->Arch())) {
       return false;
     }
     loc_regs.cie = fde->cie;
@@ -464,6 +465,13 @@
         eval_info->return_address_undefined = true;
       }
       break;
+    case DWARF_LOCATION_PSEUDO_REGISTER: {
+      if (!eval_info->regs_info.regs->SetPseudoRegister(reg, loc->values[0])) {
+        last_error_.code = DWARF_ERROR_ILLEGAL_VALUE;
+        return false;
+      }
+      break;
+    }
     default:
       break;
   }
@@ -491,6 +499,10 @@
   // Always set the dex pc to zero when evaluating.
   cur_regs->set_dex_pc(0);
 
+  // Reset necessary pseudo registers before evaluation.
+  // This is needed for ARM64, for example.
+  regs->ResetPseudoRegisters();
+
   EvalInfo<AddressType> eval_info{.loc_regs = &loc_regs,
                                   .cie = cie,
                                   .regular_memory = regular_memory,
@@ -527,8 +539,10 @@
 
     AddressType* reg_ptr;
     if (reg >= cur_regs->total_regs()) {
-      // Skip this unknown register.
-      continue;
+      if (entry.second.type != DWARF_LOCATION_PSEUDO_REGISTER) {
+        // Skip this unknown register.
+        continue;
+      }
     }
 
     reg_ptr = eval_info.regs_info.Save(reg);
@@ -554,8 +568,8 @@
 
 template <typename AddressType>
 bool DwarfSectionImpl<AddressType>::GetCfaLocationInfo(uint64_t pc, const DwarfFde* fde,
-                                                       dwarf_loc_regs_t* loc_regs) {
-  DwarfCfa<AddressType> cfa(&memory_, fde);
+                                                       dwarf_loc_regs_t* loc_regs, ArchEnum arch) {
+  DwarfCfa<AddressType> cfa(&memory_, fde, arch);
 
   // Look for the cached copy of the cie data.
   auto reg_entry = cie_loc_regs_.find(fde->cie_offset);
@@ -576,8 +590,9 @@
 }
 
 template <typename AddressType>
-bool DwarfSectionImpl<AddressType>::Log(uint8_t indent, uint64_t pc, const DwarfFde* fde) {
-  DwarfCfa<AddressType> cfa(&memory_, fde);
+bool DwarfSectionImpl<AddressType>::Log(uint8_t indent, uint64_t pc, const DwarfFde* fde,
+                                        ArchEnum arch) {
+  DwarfCfa<AddressType> cfa(&memory_, fde, arch);
 
   // Always print the cie information.
   const DwarfCie* cie = fde->cie;
diff --git a/libunwindstack/RegsArm64.cpp b/libunwindstack/RegsArm64.cpp
index 5b7431a..b496187 100644
--- a/libunwindstack/RegsArm64.cpp
+++ b/libunwindstack/RegsArm64.cpp
@@ -30,7 +30,10 @@
 namespace unwindstack {
 
 RegsArm64::RegsArm64()
-    : RegsImpl<uint64_t>(ARM64_REG_LAST, Location(LOCATION_REGISTER, ARM64_REG_LR)) {}
+    : RegsImpl<uint64_t>(ARM64_REG_LAST, Location(LOCATION_REGISTER, ARM64_REG_LR)) {
+  ResetPseudoRegisters();
+  pac_mask_ = 0;
+}
 
 ArchEnum RegsArm64::Arch() {
   return ARCH_ARM64;
@@ -45,6 +48,23 @@
 }
 
 void RegsArm64::set_pc(uint64_t pc) {
+  // If the target is aarch64 then the return address may have been
+  // signed using the Armv8.3-A Pointer Authentication extension. The
+  // original return address can be restored by stripping out the
+  // authentication code using a mask or xpaclri. xpaclri is a NOP on
+  // pre-Armv8.3-A architectures.
+  if ((0 != pc) && IsRASigned()) {
+    if (pac_mask_) {
+      pc &= ~pac_mask_;
+#if defined(__aarch64__)
+    } else {
+      register uint64_t x30 __asm("x30") = pc;
+      // This is XPACLRI.
+      asm("hint 0x7" : "+r"(x30));
+      pc = x30;
+#endif
+    }
+  }
   regs_[ARM64_REG_PC] = pc;
 }
 
@@ -144,6 +164,37 @@
   return true;
 }
 
+void RegsArm64::ResetPseudoRegisters(void) {
+  // DWARF for AArch64 says RA_SIGN_STATE should be initialized to 0.
+  this->SetPseudoRegister(Arm64Reg::ARM64_PREG_RA_SIGN_STATE, 0);
+}
+
+bool RegsArm64::SetPseudoRegister(uint16_t id, uint64_t value) {
+  if ((id >= Arm64Reg::ARM64_PREG_FIRST) && (id < Arm64Reg::ARM64_PREG_LAST)) {
+    pseudo_regs_[id - Arm64Reg::ARM64_PREG_FIRST] = value;
+    return true;
+  }
+  return false;
+}
+
+bool RegsArm64::GetPseudoRegister(uint16_t id, uint64_t* value) {
+  if ((id >= Arm64Reg::ARM64_PREG_FIRST) && (id < Arm64Reg::ARM64_PREG_LAST)) {
+    *value = pseudo_regs_[id - Arm64Reg::ARM64_PREG_FIRST];
+    return true;
+  }
+  return false;
+}
+
+bool RegsArm64::IsRASigned() {
+  uint64_t value;
+  auto result = this->GetPseudoRegister(Arm64Reg::ARM64_PREG_RA_SIGN_STATE, &value);
+  return (result && (value != 0));
+}
+
+void RegsArm64::SetPACMask(uint64_t mask) {
+  pac_mask_ = mask;
+}
+
 Regs* RegsArm64::Clone() {
   return new RegsArm64(*this);
 }
diff --git a/libunwindstack/include/unwindstack/DwarfLocation.h b/libunwindstack/include/unwindstack/DwarfLocation.h
index 3d50ccf..bf45bc7 100644
--- a/libunwindstack/include/unwindstack/DwarfLocation.h
+++ b/libunwindstack/include/unwindstack/DwarfLocation.h
@@ -33,6 +33,7 @@
   DWARF_LOCATION_REGISTER,
   DWARF_LOCATION_EXPRESSION,
   DWARF_LOCATION_VAL_EXPRESSION,
+  DWARF_LOCATION_PSEUDO_REGISTER,
 };
 
 struct DwarfLocation {
diff --git a/libunwindstack/include/unwindstack/DwarfSection.h b/libunwindstack/include/unwindstack/DwarfSection.h
index c244749..af823da 100644
--- a/libunwindstack/include/unwindstack/DwarfSection.h
+++ b/libunwindstack/include/unwindstack/DwarfSection.h
@@ -31,6 +31,7 @@
 namespace unwindstack {
 
 // Forward declarations.
+enum ArchEnum : uint8_t;
 class Memory;
 class Regs;
 template <typename AddressType>
@@ -90,13 +91,14 @@
 
   virtual bool Eval(const DwarfCie*, Memory*, const dwarf_loc_regs_t&, Regs*, bool*) = 0;
 
-  virtual bool Log(uint8_t indent, uint64_t pc, const DwarfFde* fde) = 0;
+  virtual bool Log(uint8_t indent, uint64_t pc, const DwarfFde* fde, ArchEnum arch) = 0;
 
   virtual void GetFdes(std::vector<const DwarfFde*>* fdes) = 0;
 
   virtual const DwarfFde* GetFdeFromPc(uint64_t pc) = 0;
 
-  virtual bool GetCfaLocationInfo(uint64_t pc, const DwarfFde* fde, dwarf_loc_regs_t* loc_regs) = 0;
+  virtual bool GetCfaLocationInfo(uint64_t pc, const DwarfFde* fde, dwarf_loc_regs_t* loc_regs,
+                                  ArchEnum arch) = 0;
 
   virtual uint64_t GetCieOffsetFromFde32(uint32_t pointer) = 0;
 
@@ -140,9 +142,10 @@
   bool Eval(const DwarfCie* cie, Memory* regular_memory, const dwarf_loc_regs_t& loc_regs,
             Regs* regs, bool* finished) override;
 
-  bool GetCfaLocationInfo(uint64_t pc, const DwarfFde* fde, dwarf_loc_regs_t* loc_regs) override;
+  bool GetCfaLocationInfo(uint64_t pc, const DwarfFde* fde, dwarf_loc_regs_t* loc_regs,
+                          ArchEnum arch) override;
 
-  bool Log(uint8_t indent, uint64_t pc, const DwarfFde* fde) override;
+  bool Log(uint8_t indent, uint64_t pc, const DwarfFde* fde, ArchEnum arch) override;
 
  protected:
   bool GetNextCieOrFde(const DwarfFde** fde_entry);
diff --git a/libunwindstack/include/unwindstack/MachineArm64.h b/libunwindstack/include/unwindstack/MachineArm64.h
index e953335..358e3d9 100644
--- a/libunwindstack/include/unwindstack/MachineArm64.h
+++ b/libunwindstack/include/unwindstack/MachineArm64.h
@@ -60,6 +60,13 @@
 
   ARM64_REG_SP = ARM64_REG_R31,
   ARM64_REG_LR = ARM64_REG_R30,
+
+  // Pseudo registers. These are not machine registers.
+
+  // AARCH64 Return address signed state pseudo-register
+  ARM64_PREG_RA_SIGN_STATE = 34,
+  ARM64_PREG_FIRST = ARM64_PREG_RA_SIGN_STATE,
+  ARM64_PREG_LAST,
 };
 
 }  // namespace unwindstack
diff --git a/libunwindstack/include/unwindstack/Regs.h b/libunwindstack/include/unwindstack/Regs.h
index a367e6c..5f42565 100644
--- a/libunwindstack/include/unwindstack/Regs.h
+++ b/libunwindstack/include/unwindstack/Regs.h
@@ -64,6 +64,10 @@
   uint64_t dex_pc() { return dex_pc_; }
   void set_dex_pc(uint64_t dex_pc) { dex_pc_ = dex_pc; }
 
+  virtual void ResetPseudoRegisters() {}
+  virtual bool SetPseudoRegister(uint16_t, uint64_t) { return false; }
+  virtual bool GetPseudoRegister(uint16_t, uint64_t*) { return false; }
+
   virtual bool StepIfSignalHandler(uint64_t elf_offset, Elf* elf, Memory* process_memory) = 0;
 
   virtual bool SetPcFromReturnAddress(Memory* process_memory) = 0;
diff --git a/libunwindstack/include/unwindstack/RegsArm64.h b/libunwindstack/include/unwindstack/RegsArm64.h
index 2b3ddeb..bf7ab15 100644
--- a/libunwindstack/include/unwindstack/RegsArm64.h
+++ b/libunwindstack/include/unwindstack/RegsArm64.h
@@ -22,6 +22,7 @@
 #include <functional>
 
 #include <unwindstack/Elf.h>
+#include <unwindstack/MachineArm64.h>
 #include <unwindstack/Regs.h>
 
 namespace unwindstack {
@@ -48,11 +49,25 @@
   void set_pc(uint64_t pc) override;
   void set_sp(uint64_t sp) override;
 
+  void ResetPseudoRegisters() override;
+
+  bool SetPseudoRegister(uint16_t id, uint64_t value) override;
+
+  bool GetPseudoRegister(uint16_t id, uint64_t* value) override;
+
+  bool IsRASigned();
+
+  void SetPACMask(uint64_t mask);
+
   Regs* Clone() override final;
 
   static Regs* Read(void* data);
 
   static Regs* CreateFromUcontext(void* ucontext);
+
+ protected:
+  uint64_t pseudo_regs_[Arm64Reg::ARM64_PREG_LAST - Arm64Reg::ARM64_PREG_FIRST];
+  uint64_t pac_mask_;
 };
 
 }  // namespace unwindstack
diff --git a/libunwindstack/tests/DwarfCfaLogTest.cpp b/libunwindstack/tests/DwarfCfaLogTest.cpp
index def4088..2b5a8dc 100644
--- a/libunwindstack/tests/DwarfCfaLogTest.cpp
+++ b/libunwindstack/tests/DwarfCfaLogTest.cpp
@@ -26,6 +26,7 @@
 #include <unwindstack/DwarfLocation.h>
 #include <unwindstack/DwarfMemory.h>
 #include <unwindstack/DwarfStructs.h>
+#include <unwindstack/Elf.h>
 #include <unwindstack/Log.h>
 
 #include "DwarfCfa.h"
@@ -57,7 +58,7 @@
     fde_.pc_end = 0x2000;
     fde_.pc_end = 0x10000;
     fde_.cie = &cie_;
-    cfa_.reset(new DwarfCfa<TypeParam>(dmem_.get(), &fde_));
+    cfa_.reset(new DwarfCfa<TypeParam>(dmem_.get(), &fde_, ARCH_UNKNOWN));
   }
 
   MemoryFake memory_;
@@ -72,8 +73,8 @@
 
 TYPED_TEST_P(DwarfCfaLogTest, cfa_illegal) {
   for (uint8_t i = 0x17; i < 0x3f; i++) {
-    if (i == 0x2e || i == 0x2f) {
-      // Skip gnu extension ops.
+    if (i == 0x2d || i == 0x2e || i == 0x2f) {
+      // Skip gnu extension ops and aarch64 specialized op.
       continue;
     }
     this->memory_.SetMemory(0x2000, std::vector<uint8_t>{i});
@@ -763,6 +764,26 @@
   ASSERT_EQ("", GetFakeLogBuf());
 }
 
+TYPED_TEST_P(DwarfCfaLogTest, cfa_aarch64_negate_ra_state) {
+  // Verify that if the cfa op is handled properly depending on aarch.
+  this->memory_.SetMemory(0x2000, std::vector<uint8_t>{0x2d});
+
+  ASSERT_TRUE(this->cfa_->Log(0, this->fde_.pc_start, 0x2000, 0x2001));
+  std::string expected = "4 unwind Illegal (Only valid on aarch64)\n";
+  expected += "4 unwind Raw Data: 0x2d\n";
+  ASSERT_EQ(expected, GetFakeLogPrint());
+  ASSERT_EQ("", GetFakeLogBuf());
+
+  ResetLogs();
+  this->cfa_.reset(new DwarfCfa<TypeParam>(this->dmem_.get(), &this->fde_, ARCH_ARM64));
+
+  ASSERT_TRUE(this->cfa_->Log(0, this->fde_.pc_start, 0x2000, 0x2001));
+  expected = "4 unwind DW_CFA_AARCH64_negate_ra_state\n";
+  expected += "4 unwind Raw Data: 0x2d\n";
+  ASSERT_EQ(expected, GetFakeLogPrint());
+  ASSERT_EQ("", GetFakeLogBuf());
+}
+
 REGISTER_TYPED_TEST_SUITE_P(DwarfCfaLogTest, cfa_illegal, cfa_nop, cfa_offset, cfa_offset_extended,
                             cfa_offset_extended_sf, cfa_restore, cfa_restore_extended, cfa_set_loc,
                             cfa_advance_loc, cfa_advance_loc1, cfa_advance_loc2, cfa_advance_loc4,
@@ -771,7 +792,8 @@
                             cfa_def_cfa_register, cfa_def_cfa_offset, cfa_def_cfa_offset_sf,
                             cfa_def_cfa_expression, cfa_expression, cfa_val_offset,
                             cfa_val_offset_sf, cfa_val_expression, cfa_gnu_args_size,
-                            cfa_gnu_negative_offset_extended, cfa_register_override);
+                            cfa_gnu_negative_offset_extended, cfa_register_override,
+                            cfa_aarch64_negate_ra_state);
 
 typedef ::testing::Types<uint32_t, uint64_t> DwarfCfaLogTestTypes;
 INSTANTIATE_TYPED_TEST_SUITE_P(Libunwindstack, DwarfCfaLogTest, DwarfCfaLogTestTypes);
diff --git a/libunwindstack/tests/DwarfCfaTest.cpp b/libunwindstack/tests/DwarfCfaTest.cpp
index 9c6ab05..ea7e708 100644
--- a/libunwindstack/tests/DwarfCfaTest.cpp
+++ b/libunwindstack/tests/DwarfCfaTest.cpp
@@ -25,7 +25,9 @@
 #include <unwindstack/DwarfLocation.h>
 #include <unwindstack/DwarfMemory.h>
 #include <unwindstack/DwarfStructs.h>
+#include <unwindstack/Elf.h>
 #include <unwindstack/Log.h>
+#include <unwindstack/MachineArm64.h>
 
 #include "DwarfCfa.h"
 
@@ -55,7 +57,7 @@
     fde_.pc_start = 0x2000;
     fde_.cie = &cie_;
 
-    cfa_.reset(new DwarfCfa<TypeParam>(dmem_.get(), &fde_));
+    cfa_.reset(new DwarfCfa<TypeParam>(dmem_.get(), &fde_, ARCH_UNKNOWN));
   }
 
   MemoryFake memory_;
@@ -70,8 +72,8 @@
 
 TYPED_TEST_P(DwarfCfaTest, cfa_illegal) {
   for (uint8_t i = 0x17; i < 0x3f; i++) {
-    if (i == 0x2e || i == 0x2f) {
-      // Skip gnu extension ops.
+    if (i == 0x2d || i == 0x2e || i == 0x2f) {
+      // Skip gnu extension ops and aarch64 specialized op.
       continue;
     }
     this->memory_.SetMemory(0x2000, std::vector<uint8_t>{i});
@@ -952,6 +954,57 @@
   ASSERT_EQ("", GetFakeLogBuf());
 }
 
+TYPED_TEST_P(DwarfCfaTest, cfa_aarch64_negate_ra_state) {
+  this->memory_.SetMemory(0x2000, std::vector<uint8_t>{0x2d});
+  dwarf_loc_regs_t loc_regs;
+
+  ASSERT_FALSE(this->cfa_->GetLocationInfo(this->fde_.pc_start, 0x2000, 0x2001, &loc_regs));
+  ASSERT_EQ(DWARF_ERROR_ILLEGAL_VALUE, this->cfa_->LastErrorCode());
+  ASSERT_EQ(0x2001U, this->dmem_->cur_offset());
+
+  ASSERT_EQ("", GetFakeLogPrint());
+  ASSERT_EQ("", GetFakeLogBuf());
+
+  ResetLogs();
+  this->cfa_.reset(new DwarfCfa<TypeParam>(this->dmem_.get(), &this->fde_, ARCH_ARM64));
+  ASSERT_TRUE(this->cfa_->GetLocationInfo(this->fde_.pc_start, 0x2000, 0x2001, &loc_regs));
+  ASSERT_EQ(0x2001U, this->dmem_->cur_offset());
+
+  auto location = loc_regs.find(Arm64Reg::ARM64_PREG_RA_SIGN_STATE);
+  ASSERT_NE(loc_regs.end(), location);
+  ASSERT_EQ(DWARF_LOCATION_PSEUDO_REGISTER, location->second.type);
+  ASSERT_EQ(1U, location->second.values[0]);
+
+  ASSERT_EQ("", GetFakeLogPrint());
+  ASSERT_EQ("", GetFakeLogBuf());
+
+  // Verify that the value is set to 0 after another evaluation.
+  ResetLogs();
+  ASSERT_TRUE(this->cfa_->GetLocationInfo(this->fde_.pc_start, 0x2000, 0x2001, &loc_regs));
+  ASSERT_EQ(0x2001U, this->dmem_->cur_offset());
+
+  location = loc_regs.find(Arm64Reg::ARM64_PREG_RA_SIGN_STATE);
+  ASSERT_NE(loc_regs.end(), location);
+  ASSERT_EQ(DWARF_LOCATION_PSEUDO_REGISTER, location->second.type);
+  ASSERT_EQ(0U, location->second.values[0]);
+
+  ASSERT_EQ("", GetFakeLogPrint());
+  ASSERT_EQ("", GetFakeLogBuf());
+
+  // Verify that the value is set to 1 again after a third op.
+  ResetLogs();
+  ASSERT_TRUE(this->cfa_->GetLocationInfo(this->fde_.pc_start, 0x2000, 0x2001, &loc_regs));
+  ASSERT_EQ(0x2001U, this->dmem_->cur_offset());
+
+  location = loc_regs.find(Arm64Reg::ARM64_PREG_RA_SIGN_STATE);
+  ASSERT_NE(loc_regs.end(), location);
+  ASSERT_EQ(DWARF_LOCATION_PSEUDO_REGISTER, location->second.type);
+  ASSERT_EQ(1U, location->second.values[0]);
+
+  ASSERT_EQ("", GetFakeLogPrint());
+  ASSERT_EQ("", GetFakeLogBuf());
+}
+
 REGISTER_TYPED_TEST_SUITE_P(DwarfCfaTest, cfa_illegal, cfa_nop, cfa_offset, cfa_offset_extended,
                             cfa_offset_extended_sf, cfa_restore, cfa_restore_extended, cfa_set_loc,
                             cfa_advance_loc1, cfa_advance_loc2, cfa_advance_loc4, cfa_undefined,
@@ -960,7 +1013,7 @@
                             cfa_def_cfa_offset_sf, cfa_def_cfa_expression, cfa_expression,
                             cfa_val_offset, cfa_val_offset_sf, cfa_val_expression,
                             cfa_gnu_args_size, cfa_gnu_negative_offset_extended,
-                            cfa_register_override);
+                            cfa_register_override, cfa_aarch64_negate_ra_state);
 
 typedef ::testing::Types<uint32_t, uint64_t> DwarfCfaTestTypes;
 INSTANTIATE_TYPED_TEST_SUITE_P(Libunwindstack, DwarfCfaTest, DwarfCfaTestTypes);
diff --git a/libunwindstack/tests/DwarfSectionImplTest.cpp b/libunwindstack/tests/DwarfSectionImplTest.cpp
index cac59b7..d57cd33 100644
--- a/libunwindstack/tests/DwarfSectionImplTest.cpp
+++ b/libunwindstack/tests/DwarfSectionImplTest.cpp
@@ -20,6 +20,7 @@
 
 #include <unwindstack/DwarfError.h>
 #include <unwindstack/DwarfSection.h>
+#include <unwindstack/Elf.h>
 
 #include "DwarfEncoding.h"
 
@@ -505,7 +506,7 @@
   this->memory_.SetMemory(0x6000, std::vector<uint8_t>{0x09, 0x04, 0x03});
 
   dwarf_loc_regs_t loc_regs;
-  ASSERT_TRUE(this->section_->GetCfaLocationInfo(0x100, &fde, &loc_regs));
+  ASSERT_TRUE(this->section_->GetCfaLocationInfo(0x100, &fde, &loc_regs, ARCH_UNKNOWN));
   ASSERT_EQ(2U, loc_regs.size());
 
   auto entry = loc_regs.find(2);
@@ -535,7 +536,7 @@
   this->memory_.SetMemory(0x6000, std::vector<uint8_t>{0x09, 0x04, 0x03});
 
   dwarf_loc_regs_t loc_regs;
-  ASSERT_TRUE(this->section_->GetCfaLocationInfo(0x100, &fde, &loc_regs));
+  ASSERT_TRUE(this->section_->GetCfaLocationInfo(0x100, &fde, &loc_regs, ARCH_UNKNOWN));
   ASSERT_EQ(2U, loc_regs.size());
 
   auto entry = loc_regs.find(6);
@@ -560,7 +561,7 @@
 
   this->memory_.SetMemory(0x5000, std::vector<uint8_t>{0x00});
   this->memory_.SetMemory(0x6000, std::vector<uint8_t>{0xc2});
-  ASSERT_TRUE(this->section_->Log(2, 0x1000, &fde));
+  ASSERT_TRUE(this->section_->Log(2, 0x1000, &fde, ARCH_UNKNOWN));
 
   ASSERT_EQ(
       "4 unwind     DW_CFA_nop\n"
diff --git a/libunwindstack/tests/DwarfSectionTest.cpp b/libunwindstack/tests/DwarfSectionTest.cpp
index 953dc75..febd6d3 100644
--- a/libunwindstack/tests/DwarfSectionTest.cpp
+++ b/libunwindstack/tests/DwarfSectionTest.cpp
@@ -20,8 +20,10 @@
 #include <gtest/gtest.h>
 
 #include <unwindstack/DwarfSection.h>
+#include <unwindstack/Elf.h>
 
 #include "MemoryFake.h"
+#include "RegsFake.h"
 
 namespace unwindstack {
 
@@ -35,13 +37,14 @@
   MOCK_METHOD(bool, Eval, (const DwarfCie*, Memory*, const dwarf_loc_regs_t&, Regs*, bool*),
               (override));
 
-  MOCK_METHOD(bool, Log, (uint8_t, uint64_t, const DwarfFde*), (override));
+  MOCK_METHOD(bool, Log, (uint8_t, uint64_t, const DwarfFde*, ArchEnum arch), (override));
 
   MOCK_METHOD(void, GetFdes, (std::vector<const DwarfFde*>*), (override));
 
   MOCK_METHOD(const DwarfFde*, GetFdeFromPc, (uint64_t), (override));
 
-  MOCK_METHOD(bool, GetCfaLocationInfo, (uint64_t, const DwarfFde*, dwarf_loc_regs_t*), (override));
+  MOCK_METHOD(bool, GetCfaLocationInfo,
+              (uint64_t, const DwarfFde*, dwarf_loc_regs_t*, ArchEnum arch), (override));
 
   MOCK_METHOD(uint64_t, GetCieOffsetFromFde32, (uint32_t), (override));
 
@@ -56,8 +59,11 @@
 
   MemoryFake memory_;
   std::unique_ptr<MockDwarfSection> section_;
+  static RegsFake regs_;
 };
 
+RegsFake DwarfSectionTest::regs_(10);
+
 TEST_F(DwarfSectionTest, Step_fail_fde) {
   EXPECT_CALL(*section_, GetFdeFromPc(0x1000)).WillOnce(::testing::Return(nullptr));
 
@@ -73,7 +79,7 @@
   EXPECT_CALL(*section_, GetFdeFromPc(0x1000)).WillOnce(::testing::Return(&fde));
 
   bool finished;
-  ASSERT_FALSE(section_->Step(0x1000, nullptr, nullptr, &finished));
+  ASSERT_FALSE(section_->Step(0x1000, &regs_, nullptr, &finished));
 }
 
 TEST_F(DwarfSectionTest, Step_fail_cfa_location) {
@@ -83,11 +89,11 @@
   fde.cie = &cie;
 
   EXPECT_CALL(*section_, GetFdeFromPc(0x1000)).WillOnce(::testing::Return(&fde));
-  EXPECT_CALL(*section_, GetCfaLocationInfo(0x1000, &fde, ::testing::_))
+  EXPECT_CALL(*section_, GetCfaLocationInfo(0x1000, &fde, ::testing::_, ::testing::_))
       .WillOnce(::testing::Return(false));
 
   bool finished;
-  ASSERT_FALSE(section_->Step(0x1000, nullptr, nullptr, &finished));
+  ASSERT_FALSE(section_->Step(0x1000, &regs_, nullptr, &finished));
 }
 
 TEST_F(DwarfSectionTest, Step_pass) {
@@ -97,19 +103,19 @@
   fde.cie = &cie;
 
   EXPECT_CALL(*section_, GetFdeFromPc(0x1000)).WillOnce(::testing::Return(&fde));
-  EXPECT_CALL(*section_, GetCfaLocationInfo(0x1000, &fde, ::testing::_))
+  EXPECT_CALL(*section_, GetCfaLocationInfo(0x1000, &fde, ::testing::_, ::testing::_))
       .WillOnce(::testing::Return(true));
 
   MemoryFake process;
-  EXPECT_CALL(*section_, Eval(&cie, &process, ::testing::_, nullptr, ::testing::_))
+  EXPECT_CALL(*section_, Eval(&cie, &process, ::testing::_, &regs_, ::testing::_))
       .WillOnce(::testing::Return(true));
 
   bool finished;
-  ASSERT_TRUE(section_->Step(0x1000, nullptr, &process, &finished));
+  ASSERT_TRUE(section_->Step(0x1000, &regs_, &process, &finished));
 }
 
 static bool MockGetCfaLocationInfo(::testing::Unused, const DwarfFde* fde,
-                                   dwarf_loc_regs_t* loc_regs) {
+                                   dwarf_loc_regs_t* loc_regs, ArchEnum) {
   loc_regs->pc_start = fde->pc_start;
   loc_regs->pc_end = fde->pc_end;
   return true;
@@ -123,17 +129,17 @@
   fde.cie = &cie;
 
   EXPECT_CALL(*section_, GetFdeFromPc(0x1000)).WillOnce(::testing::Return(&fde));
-  EXPECT_CALL(*section_, GetCfaLocationInfo(0x1000, &fde, ::testing::_))
+  EXPECT_CALL(*section_, GetCfaLocationInfo(0x1000, &fde, ::testing::_, ::testing::_))
       .WillOnce(::testing::Invoke(MockGetCfaLocationInfo));
 
   MemoryFake process;
-  EXPECT_CALL(*section_, Eval(&cie, &process, ::testing::_, nullptr, ::testing::_))
+  EXPECT_CALL(*section_, Eval(&cie, &process, ::testing::_, &regs_, ::testing::_))
       .WillRepeatedly(::testing::Return(true));
 
   bool finished;
-  ASSERT_TRUE(section_->Step(0x1000, nullptr, &process, &finished));
-  ASSERT_TRUE(section_->Step(0x1000, nullptr, &process, &finished));
-  ASSERT_TRUE(section_->Step(0x1500, nullptr, &process, &finished));
+  ASSERT_TRUE(section_->Step(0x1000, &regs_, &process, &finished));
+  ASSERT_TRUE(section_->Step(0x1000, &regs_, &process, &finished));
+  ASSERT_TRUE(section_->Step(0x1500, &regs_, &process, &finished));
 }
 
 TEST_F(DwarfSectionTest, Step_cache_not_in_pc) {
@@ -143,26 +149,26 @@
   fde0.pc_end = 0x2000;
   fde0.cie = &cie;
   EXPECT_CALL(*section_, GetFdeFromPc(0x1000)).WillOnce(::testing::Return(&fde0));
-  EXPECT_CALL(*section_, GetCfaLocationInfo(0x1000, &fde0, ::testing::_))
+  EXPECT_CALL(*section_, GetCfaLocationInfo(0x1000, &fde0, ::testing::_, ::testing::_))
       .WillOnce(::testing::Invoke(MockGetCfaLocationInfo));
 
   MemoryFake process;
-  EXPECT_CALL(*section_, Eval(&cie, &process, ::testing::_, nullptr, ::testing::_))
+  EXPECT_CALL(*section_, Eval(&cie, &process, ::testing::_, &regs_, ::testing::_))
       .WillRepeatedly(::testing::Return(true));
 
   bool finished;
-  ASSERT_TRUE(section_->Step(0x1000, nullptr, &process, &finished));
+  ASSERT_TRUE(section_->Step(0x1000, &regs_, &process, &finished));
 
   DwarfFde fde1{};
   fde1.pc_start = 0x500;
   fde1.pc_end = 0x800;
   fde1.cie = &cie;
   EXPECT_CALL(*section_, GetFdeFromPc(0x600)).WillOnce(::testing::Return(&fde1));
-  EXPECT_CALL(*section_, GetCfaLocationInfo(0x600, &fde1, ::testing::_))
+  EXPECT_CALL(*section_, GetCfaLocationInfo(0x600, &fde1, ::testing::_, ::testing::_))
       .WillOnce(::testing::Invoke(MockGetCfaLocationInfo));
 
-  ASSERT_TRUE(section_->Step(0x600, nullptr, &process, &finished));
-  ASSERT_TRUE(section_->Step(0x700, nullptr, &process, &finished));
+  ASSERT_TRUE(section_->Step(0x600, &regs_, &process, &finished));
+  ASSERT_TRUE(section_->Step(0x700, &regs_, &process, &finished));
 }
 
 }  // namespace unwindstack
diff --git a/libunwindstack/tests/RegsTest.cpp b/libunwindstack/tests/RegsTest.cpp
index e4fc6f0..acf72de 100644
--- a/libunwindstack/tests/RegsTest.cpp
+++ b/libunwindstack/tests/RegsTest.cpp
@@ -247,6 +247,14 @@
   EXPECT_EQ(0xc200000000U, mips64.pc());
 }
 
+TEST_F(RegsTest, arm64_strip_pac_mask) {
+  RegsArm64 arm64;
+  arm64.SetPseudoRegister(Arm64Reg::ARM64_PREG_RA_SIGN_STATE, 1);
+  arm64.SetPACMask(0x007fff8000000000ULL);
+  arm64.set_pc(0x0020007214bb3a04ULL);
+  EXPECT_EQ(0x0000007214bb3a04ULL, arm64.pc());
+}
+
 TEST_F(RegsTest, machine_type) {
   RegsArm arm_regs;
   EXPECT_EQ(ARCH_ARM, arm_regs.Arch());
diff --git a/libunwindstack/tests/VerifyBionicTerminationTest.cpp b/libunwindstack/tests/VerifyBionicTerminationTest.cpp
index 6a3e91a..eb2b01d 100644
--- a/libunwindstack/tests/VerifyBionicTerminationTest.cpp
+++ b/libunwindstack/tests/VerifyBionicTerminationTest.cpp
@@ -55,7 +55,7 @@
     return DWARF_LOCATION_INVALID;
   }
   dwarf_loc_regs_t regs;
-  if (!section->GetCfaLocationInfo(rel_pc, fde, &regs)) {
+  if (!section->GetCfaLocationInfo(rel_pc, fde, &regs, ARCH_UNKNOWN)) {
     return DWARF_LOCATION_INVALID;
   }
 
diff --git a/libunwindstack/tests/fuzz/UnwinderComponentCreator.cpp b/libunwindstack/tests/fuzz/UnwinderComponentCreator.cpp
index 94f5a73..0415ef6 100644
--- a/libunwindstack/tests/fuzz/UnwinderComponentCreator.cpp
+++ b/libunwindstack/tests/fuzz/UnwinderComponentCreator.cpp
@@ -16,6 +16,11 @@
 
 #include "UnwinderComponentCreator.h"
 
+#include <map>
+#include <memory>
+#include <string>
+#include <vector>
+
 std::unique_ptr<Regs> GetRegisters(ArchEnum arch) {
   switch (arch) {
     case unwindstack::ARCH_ARM: {
@@ -109,13 +114,28 @@
   return elf;
 }
 
+static constexpr size_t kPageSize = 4096;
+
+static constexpr uint64_t AlignToPage(uint64_t address) {
+  return (address + kPageSize - 1) & ~(kPageSize - 1);
+}
+
 std::unique_ptr<Maps> GetMaps(FuzzedDataProvider* data_provider) {
   std::unique_ptr<Maps> maps = std::make_unique<Maps>();
+  std::map<uint64_t, uint64_t> map_ends;
   uint8_t entry_count = data_provider->ConsumeIntegralInRange<uint8_t>(0, kMaxMapEntryCount);
   for (uint8_t i = 0; i < entry_count; i++) {
-    uint64_t start = data_provider->ConsumeIntegral<uint64_t>();
-    uint64_t end = data_provider->ConsumeIntegralInRange<uint64_t>(start, UINT64_MAX);
-    uint64_t offset = data_provider->ConsumeIntegral<uint64_t>();
+    uint64_t start = AlignToPage(data_provider->ConsumeIntegral<uint64_t>());
+    uint64_t end = AlignToPage(data_provider->ConsumeIntegralInRange<uint64_t>(start, UINT64_MAX));
+    // Make sure not to add overlapping maps, that is not something that can
+    // happen in the real world.
+    auto entry = map_ends.upper_bound(start);
+    if (entry != map_ends.end() && end > entry->second) {
+      continue;
+    }
+    map_ends[end] = start;
+
+    uint64_t offset = AlignToPage(data_provider->ConsumeIntegral<uint64_t>());
     std::string map_info_name = data_provider->ConsumeRandomLengthString(kMaxMapInfoNameLen);
     uint8_t flags = PROT_READ | PROT_WRITE;
 
diff --git a/libunwindstack/tools/unwind_info.cpp b/libunwindstack/tools/unwind_info.cpp
index 7a6d8ba..a5002f2 100644
--- a/libunwindstack/tools/unwind_info.cpp
+++ b/libunwindstack/tools/unwind_info.cpp
@@ -96,7 +96,7 @@
       printf(" <%s>", name.c_str());
     }
     printf("\n");
-    if (!section->Log(2, UINT64_MAX, fde)) {
+    if (!section->Log(2, UINT64_MAX, fde, elf->arch())) {
       printf("Failed to process cfa information for entry at 0x%" PRIx64 "\n", fde->pc_start);
     }
   }
diff --git a/libunwindstack/tools/unwind_reg_info.cpp b/libunwindstack/tools/unwind_reg_info.cpp
index 0cbcac5..68e0273 100644
--- a/libunwindstack/tools/unwind_reg_info.cpp
+++ b/libunwindstack/tools/unwind_reg_info.cpp
@@ -64,7 +64,8 @@
   }
 }
 
-void PrintRegInformation(DwarfSection* section, Memory* memory, uint64_t pc, uint8_t class_type) {
+void PrintRegInformation(DwarfSection* section, Memory* memory, uint64_t pc, uint8_t class_type,
+                         ArchEnum arch) {
   const DwarfFde* fde = section->GetFdeFromPc(pc);
   if (fde == nullptr) {
     printf("  No fde found.\n");
@@ -72,7 +73,7 @@
   }
 
   dwarf_loc_regs_t regs;
-  if (!section->GetCfaLocationInfo(pc, fde, &regs)) {
+  if (!section->GetCfaLocationInfo(pc, fde, &regs, arch)) {
     printf("  Cannot get location information.\n");
     return;
   }
@@ -128,6 +129,11 @@
         break;
       }
 
+      case DWARF_LOCATION_PSEUDO_REGISTER: {
+        printf("%" PRId64 " (pseudo)\n", loc->values[0]);
+        break;
+      }
+
       case DWARF_LOCATION_UNDEFINED:
         printf("undefine\n");
         break;
@@ -199,7 +205,7 @@
   DwarfSection* section = interface->eh_frame();
   if (section != nullptr) {
     printf("\neh_frame:\n");
-    PrintRegInformation(section, elf.memory(), pc, elf.class_type());
+    PrintRegInformation(section, elf.memory(), pc, elf.class_type(), elf.arch());
   } else {
     printf("\nno eh_frame information\n");
   }
@@ -207,7 +213,7 @@
   section = interface->debug_frame();
   if (section != nullptr) {
     printf("\ndebug_frame:\n");
-    PrintRegInformation(section, elf.memory(), pc, elf.class_type());
+    PrintRegInformation(section, elf.memory(), pc, elf.class_type(), elf.arch());
     printf("\n");
   } else {
     printf("\nno debug_frame information\n");
@@ -219,7 +225,8 @@
     section = gnu_debugdata_interface->eh_frame();
     if (section != nullptr) {
       printf("\ngnu_debugdata (eh_frame):\n");
-      PrintRegInformation(section, gnu_debugdata_interface->memory(), pc, elf.class_type());
+      PrintRegInformation(section, gnu_debugdata_interface->memory(), pc, elf.class_type(),
+                          elf.arch());
       printf("\n");
     } else {
       printf("\nno gnu_debugdata (eh_frame)\n");
@@ -228,7 +235,8 @@
     section = gnu_debugdata_interface->debug_frame();
     if (section != nullptr) {
       printf("\ngnu_debugdata (debug_frame):\n");
-      PrintRegInformation(section, gnu_debugdata_interface->memory(), pc, elf.class_type());
+      PrintRegInformation(section, gnu_debugdata_interface->memory(), pc, elf.class_type(),
+                          elf.arch());
       printf("\n");
     } else {
       printf("\nno gnu_debugdata (debug_frame)\n");
diff --git a/libutils/Unicode.cpp b/libutils/Unicode.cpp
index b08e061..b6e457b 100644
--- a/libutils/Unicode.cpp
+++ b/libutils/Unicode.cpp
@@ -162,9 +162,9 @@
     if (index >= src_len) {
         return -1;
     }
-    size_t dummy_index;
+    size_t unused_index;
     if (next_index == nullptr) {
-        next_index = &dummy_index;
+        next_index = &unused_index;
     }
     size_t num_read;
     int32_t ret = utf32_at_internal(src + index, &num_read);
diff --git a/libutils/include/utils/BitSet.h b/libutils/include/utils/BitSet.h
index 1df4626..0fb1a6a 100644
--- a/libutils/include/utils/BitSet.h
+++ b/libutils/include/utils/BitSet.h
@@ -21,9 +21,12 @@
 #include <utils/TypeHelpers.h>
 
 /*
- * Contains some bit manipulation helpers.
+ * A class to provide efficient manipulation of bitsets.
  *
- * DO NOT USE: std::bitset<32> or std::bitset<64> preferred
+ * Consider using std::bitset<32> or std::bitset<64> if all you want is a class to do basic bit
+ * manipulation (i.e. AND / OR / XOR / flip / etc). These classes are only needed if you want to
+ * efficiently perform operations like finding the first set bit in a bitset and you want to
+ * avoid using the built-in functions (e.g. __builtin_clz) on std::bitset::to_ulong.
  */
 
 namespace android {
diff --git a/libutils/include/utils/Vector.h b/libutils/include/utils/Vector.h
index ddf71de..be35ea2 100644
--- a/libutils/include/utils/Vector.h
+++ b/libutils/include/utils/Vector.h
@@ -23,15 +23,13 @@
 #include <log/log.h>
 #include <utils/TypeHelpers.h>
 #include <utils/VectorImpl.h>
-
-/*
- * Used to blacklist some functions from CFI.
- *
- */
 #ifndef __has_attribute
 #define __has_attribute(x) 0
 #endif
 
+/*
+ * Used to exclude some functions from CFI.
+ */
 #if __has_attribute(no_sanitize)
 #define UTILS_VECTOR_NO_CFI __attribute__((no_sanitize("cfi")))
 #else
diff --git a/logcat/logcat.cpp b/logcat/logcat.cpp
index d15fa2b..6b7e016 100644
--- a/logcat/logcat.cpp
+++ b/logcat/logcat.cpp
@@ -64,6 +64,7 @@
 using android::base::ParseUint;
 using android::base::Split;
 using android::base::StringPrintf;
+using android::base::WriteFully;
 
 class Logcat {
   public:
@@ -616,15 +617,15 @@
                 if (long_options[option_index].name == wrap_str) {
                     mode |= ANDROID_LOG_WRAP | ANDROID_LOG_NONBLOCK;
                     // ToDo: implement API that supports setting a wrap timeout
-                    size_t dummy = ANDROID_LOG_WRAP_DEFAULT_TIMEOUT;
-                    if (optarg && (!ParseUint(optarg, &dummy) || dummy < 1)) {
+                    size_t timeout = ANDROID_LOG_WRAP_DEFAULT_TIMEOUT;
+                    if (optarg && (!ParseUint(optarg, &timeout) || timeout < 1)) {
                         error(EXIT_FAILURE, 0, "%s %s out of range.",
                               long_options[option_index].name, optarg);
                     }
-                    if (dummy != ANDROID_LOG_WRAP_DEFAULT_TIMEOUT) {
+                    if (timeout != ANDROID_LOG_WRAP_DEFAULT_TIMEOUT) {
                         fprintf(stderr, "WARNING: %s %u seconds, ignoring %zu\n",
                                 long_options[option_index].name, ANDROID_LOG_WRAP_DEFAULT_TIMEOUT,
-                                dummy);
+                                timeout);
                     }
                     break;
                 }
@@ -864,8 +865,7 @@
 
                     if (consolePipe) {
                         // need the trailing '\0'
-                        if (!android::base::WriteFully(fd, pipePurpose.c_str(),
-                                                       pipePurpose.size() + 1)) {
+                        if (!WriteFully(fd, pipePurpose.c_str(), pipePurpose.size() + 1)) {
                             close(fd);
                             return EXIT_FAILURE;
                         }
@@ -1064,19 +1064,23 @@
         if (getLogSize) {
             long size = android_logger_get_log_size(logger);
             long readable = android_logger_get_log_readable_size(logger);
+            long consumed = android_logger_get_log_consumed_size(logger);
 
             if (size < 0 || readable < 0) {
                 ReportErrorName(buffer_name, security_buffer_selected, &get_size_failures);
             } else {
                 auto size_format = format_of_size(size);
                 auto readable_format = format_of_size(readable);
+                auto consumed_format = format_of_size(consumed);
                 std::string str = android::base::StringPrintf(
-                        "%s: ring buffer is %lu %sB (%lu %sB consumed),"
+                        "%s: ring buffer is %lu %sB (%lu %sB consumed, %lu %sB readable),"
                         " max entry is %d B, max payload is %d B\n",
-                        buffer_name, size_format.first, size_format.second, readable_format.first,
-                        readable_format.second, (int)LOGGER_ENTRY_MAX_LEN,
-                        (int)LOGGER_ENTRY_MAX_PAYLOAD);
-                TEMP_FAILURE_RETRY(write(output_fd_.get(), str.data(), str.length()));
+                        buffer_name, size_format.first, size_format.second, consumed_format.first,
+                        consumed_format.second, readable_format.first, readable_format.second,
+                        (int)LOGGER_ENTRY_MAX_LEN, (int)LOGGER_ENTRY_MAX_PAYLOAD);
+                if (!WriteFully(output_fd_, str.data(), str.length())) {
+                    error(EXIT_FAILURE, errno, "Failed to write to output fd");
+                }
             }
         }
     }
@@ -1146,7 +1150,9 @@
         if (*cp == '\n') ++cp;
 
         size_t len = strlen(cp);
-        TEMP_FAILURE_RETRY(write(output_fd_.get(), cp, len));
+        if (!WriteFully(output_fd_, cp, len)) {
+            error(EXIT_FAILURE, errno, "Failed to write to output fd");
+        }
         return EXIT_SUCCESS;
     }
 
@@ -1190,7 +1196,9 @@
         PrintDividers(log_msg.id(), printDividers);
 
         if (print_binary_) {
-            TEMP_FAILURE_RETRY(write(output_fd_.get(), &log_msg, log_msg.len()));
+            if (!WriteFully(output_fd_, &log_msg, log_msg.len())) {
+                error(EXIT_FAILURE, errno, "Failed to write to output fd");
+            }
         } else {
             ProcessBuffer(&log_msg);
         }
diff --git a/logd/Android.bp b/logd/Android.bp
index 036cb7e..7f67ab0 100644
--- a/logd/Android.bp
+++ b/logd/Android.bp
@@ -57,6 +57,7 @@
         "LogReaderList.cpp",
         "LogReaderThread.cpp",
         "LogBufferElement.cpp",
+        "LogSize.cpp",
         "LogStatistics.cpp",
         "LogTags.cpp",
         "PruneList.cpp",
@@ -177,6 +178,27 @@
     },
     test_suites: [
         "cts",
+        "device-tests",
         "vts10",
     ],
 }
+
+cc_binary {
+    name: "replay_messages",
+    defaults: ["logd_defaults"],
+    host_supported: true,
+
+    srcs: [
+        "ReplayMessages.cpp",
+    ],
+
+    static_libs: [
+        "libbase",
+        "libcutils",
+        "liblog",
+        "liblogd",
+        "libselinux",
+        "libz",
+        "libzstd",
+    ],
+}
diff --git a/logd/CommandListener.cpp b/logd/CommandListener.cpp
index 2eeb0d9..0ba1621 100644
--- a/logd/CommandListener.cpp
+++ b/logd/CommandListener.cpp
@@ -32,6 +32,7 @@
 #include <string>
 
 #include <android-base/logging.h>
+#include <android-base/parseint.h>
 #include <android-base/stringprintf.h>
 #include <cutils/sockets.h>
 #include <log/log_properties.h>
@@ -46,6 +47,7 @@
     registerCmd(new ClearCmd(this));
     registerCmd(new GetBufSizeCmd(this));
     registerCmd(new SetBufSizeCmd(this));
+    registerCmd(new GetBufSizeReadableCmd(this));
     registerCmd(new GetBufSizeUsedCmd(this));
     registerCmd(new GetStatisticsCmd(this));
     registerCmd(new SetPruneListCmd(this));
@@ -63,53 +65,58 @@
     }
 }
 
-int CommandListener::ClearCmd::runCommand(SocketClient* cli, int argc,
-                                          char** argv) {
+template <typename F>
+static int LogIdCommand(SocketClient* cli, int argc, char** argv, F&& function) {
     setname();
+    if (argc < 2) {
+        cli->sendMsg("Missing Argument");
+        return 0;
+    }
+
+    int log_id;
+    if (!android::base::ParseInt(argv[1], &log_id, static_cast<int>(LOG_ID_MAIN),
+                                 static_cast<int>(LOG_ID_KERNEL))) {
+        cli->sendMsg("Range Error");
+        return 0;
+    }
+
+    function(static_cast<log_id_t>(log_id));
+    return 0;
+}
+
+int CommandListener::ClearCmd::runCommand(SocketClient* cli, int argc, char** argv) {
     uid_t uid = cli->getUid();
     if (clientHasLogCredentials(cli)) {
         uid = AID_ROOT;
     }
 
-    if (argc < 2) {
-        cli->sendMsg("Missing Argument");
-        return 0;
-    }
-
-    int id = atoi(argv[1]);
-    if ((id < LOG_ID_MIN) || (LOG_ID_MAX <= id)) {
-        cli->sendMsg("Range Error");
-        return 0;
-    }
-
-    cli->sendMsg(buf()->Clear((log_id_t)id, uid) ? "success" : "busy");
-    return 0;
+    return LogIdCommand(cli, argc, argv, [&](log_id_t id) {
+        cli->sendMsg(buf()->Clear(id, uid) ? "success" : "busy");
+    });
 }
 
-int CommandListener::GetBufSizeCmd::runCommand(SocketClient* cli, int argc,
-                                               char** argv) {
-    setname();
-    if (argc < 2) {
-        cli->sendMsg("Missing Argument");
-        return 0;
-    }
+template <typename F>
+static int LogSizeCommand(SocketClient* cli, int argc, char** argv, F&& size_function) {
+    return LogIdCommand(cli, argc, argv, [&](log_id_t log_id) {
+        cli->sendMsg(std::to_string(size_function(log_id)).c_str());
+    });
+}
 
-    int id = atoi(argv[1]);
-    if ((id < LOG_ID_MIN) || (LOG_ID_MAX <= id)) {
-        cli->sendMsg("Range Error");
-        return 0;
-    }
+int CommandListener::GetBufSizeCmd::runCommand(SocketClient* cli, int argc, char** argv) {
+    return LogSizeCommand(cli, argc, argv, [this](log_id_t id) { return buf()->GetSize(id); });
+}
 
-    unsigned long size = buf()->GetSize((log_id_t)id);
-    char buf[512];
-    snprintf(buf, sizeof(buf), "%lu", size);
-    cli->sendMsg(buf);
-    return 0;
+int CommandListener::GetBufSizeReadableCmd::runCommand(SocketClient* cli, int argc, char** argv) {
+    return LogSizeCommand(cli, argc, argv,
+                          [this](log_id_t id) { return stats()->SizeReadable(id); });
+}
+
+int CommandListener::GetBufSizeUsedCmd::runCommand(SocketClient* cli, int argc, char** argv) {
+    return LogSizeCommand(cli, argc, argv, [this](log_id_t id) { return stats()->Sizes(id); });
 }
 
 int CommandListener::SetBufSizeCmd::runCommand(SocketClient* cli, int argc,
                                                char** argv) {
-    setname();
     if (!clientHasLogCredentials(cli)) {
         cli->sendMsg("Permission Denied");
         return 0;
@@ -119,42 +126,11 @@
         cli->sendMsg("Missing Argument");
         return 0;
     }
+    size_t size = atol(argv[2]);
 
-    int id = atoi(argv[1]);
-    if ((id < LOG_ID_MIN) || (LOG_ID_MAX <= id)) {
-        cli->sendMsg("Range Error");
-        return 0;
-    }
-
-    unsigned long size = atol(argv[2]);
-    if (buf()->SetSize((log_id_t)id, size)) {
-        cli->sendMsg("Range Error");
-        return 0;
-    }
-
-    cli->sendMsg("success");
-    return 0;
-}
-
-int CommandListener::GetBufSizeUsedCmd::runCommand(SocketClient* cli, int argc,
-                                                   char** argv) {
-    setname();
-    if (argc < 2) {
-        cli->sendMsg("Missing Argument");
-        return 0;
-    }
-
-    int id = atoi(argv[1]);
-    if ((id < LOG_ID_MIN) || (LOG_ID_MAX <= id)) {
-        cli->sendMsg("Range Error");
-        return 0;
-    }
-
-    unsigned long size = stats()->Sizes((log_id_t)id);
-    char buf[512];
-    snprintf(buf, sizeof(buf), "%lu", size);
-    cli->sendMsg(buf);
-    return 0;
+    return LogIdCommand(cli, argc, argv, [&](log_id_t log_id) {
+        cli->sendMsg(buf()->SetSize(log_id, size) ? "success" : "busy");
+    });
 }
 
 // This returns a string with a length prefix with the format <length>\n<data>\n\f.  The length
@@ -179,8 +155,7 @@
     return android::base::StringPrintf("%zu\n%s\n\f", total_size, str.c_str());
 }
 
-int CommandListener::GetStatisticsCmd::runCommand(SocketClient* cli, int argc,
-                                                  char** argv) {
+int CommandListener::GetStatisticsCmd::runCommand(SocketClient* cli, int argc, char** argv) {
     setname();
     uid_t uid = cli->getUid();
     if (clientHasLogCredentials(cli)) {
@@ -245,8 +220,7 @@
     return 0;
 }
 
-int CommandListener::GetEventTagCmd::runCommand(SocketClient* cli, int argc,
-                                                char** argv) {
+int CommandListener::GetEventTagCmd::runCommand(SocketClient* cli, int argc, char** argv) {
     setname();
     uid_t uid = cli->getUid();
     if (clientHasLogCredentials(cli)) {
@@ -290,8 +264,7 @@
     return 0;
 }
 
-int CommandListener::ReinitCmd::runCommand(SocketClient* cli, int /*argc*/,
-                                           char** /*argv*/) {
+int CommandListener::ReinitCmd::runCommand(SocketClient* cli, int, char**) {
     setname();
 
     LOG(INFO) << "logd reinit";
@@ -314,8 +287,7 @@
     return 0;
 }
 
-int CommandListener::ExitCmd::runCommand(SocketClient* cli, int /*argc*/,
-                                         char** /*argv*/) {
+int CommandListener::ExitCmd::runCommand(SocketClient* cli, int, char**) {
     setname();
 
     cli->sendMsg("success");
diff --git a/logd/CommandListener.h b/logd/CommandListener.h
index c3080ab..8e12634 100644
--- a/logd/CommandListener.h
+++ b/logd/CommandListener.h
@@ -57,6 +57,7 @@
     LogCmd(Clear, clear);
     LogCmd(GetBufSize, getLogSize);
     LogCmd(SetBufSize, setLogSize);
+    LogCmd(GetBufSizeReadable, getLogSizeReadable);
     LogCmd(GetBufSizeUsed, getLogSizeUsed);
     LogCmd(GetStatistics, getStatistics);
     LogCmd(GetPruneList, getPruneList);
diff --git a/logd/LogAudit.cpp b/logd/LogAudit.cpp
index 0ce9796..0e17476 100644
--- a/logd/LogAudit.cpp
+++ b/logd/LogAudit.cpp
@@ -32,7 +32,7 @@
 #include <sstream>
 
 #include <android-base/macros.h>
-#include <log/log_properties.h>
+#include <android-base/properties.h>
 #include <private/android_filesystem_config.h>
 #include <private/android_logger.h>
 
@@ -40,6 +40,8 @@
 #include "LogUtils.h"
 #include "libaudit.h"
 
+using android::base::GetBoolProperty;
+
 #define KMSG_PRIORITY(PRI)                               \
     '<', '0' + LOG_MAKEPRI(LOG_AUTH, LOG_PRI(PRI)) / 10, \
         '0' + LOG_MAKEPRI(LOG_AUTH, LOG_PRI(PRI)) % 10, '>'
@@ -48,8 +50,8 @@
     : SocketListener(getLogSocket(), false),
       logbuf(buf),
       fdDmesg(fdDmesg),
-      main(__android_logger_property_get_bool("ro.logd.auditd.main", BOOL_DEFAULT_TRUE)),
-      events(__android_logger_property_get_bool("ro.logd.auditd.events", BOOL_DEFAULT_TRUE)),
+      main(GetBoolProperty("ro.logd.auditd.main", true)),
+      events(GetBoolProperty("ro.logd.auditd.events", true)),
       initialized(false),
       stats_(stats) {
     static const char auditd_message[] = { KMSG_PRIORITY(LOG_INFO),
diff --git a/logd/LogBuffer.h b/logd/LogBuffer.h
index c5d333a..a98c4b9 100644
--- a/logd/LogBuffer.h
+++ b/logd/LogBuffer.h
@@ -68,8 +68,8 @@
                                              log_time realtime)>& filter) = 0;
 
     virtual bool Clear(log_id_t id, uid_t uid) = 0;
-    virtual unsigned long GetSize(log_id_t id) = 0;
-    virtual int SetSize(log_id_t id, unsigned long size) = 0;
+    virtual size_t GetSize(log_id_t id) = 0;
+    virtual bool SetSize(log_id_t id, size_t size) = 0;
 
     virtual uint64_t sequence() const = 0;
 };
diff --git a/logd/LogBufferTest.cpp b/logd/LogBufferTest.cpp
index 47d2a2f..1911105 100644
--- a/logd/LogBufferTest.cpp
+++ b/logd/LogBufferTest.cpp
@@ -34,16 +34,6 @@
 using android::base::Split;
 using android::base::StringPrintf;
 
-#ifndef __ANDROID__
-unsigned long __android_logger_get_buffer_size(log_id_t) {
-    return 1024 * 1024;
-}
-
-bool __android_logger_valid_buffer_size(unsigned long) {
-    return true;
-}
-#endif
-
 char* android::uidToName(uid_t) {
     return nullptr;
 }
diff --git a/logd/LogBufferTest.h b/logd/LogBufferTest.h
index 1fd22c2..eeeb980 100644
--- a/logd/LogBufferTest.h
+++ b/logd/LogBufferTest.h
@@ -75,6 +75,8 @@
         } else {
             FAIL() << "Unknown buffer type selected for test";
         }
+
+        log_id_for_each(i) { log_buffer_->SetSize(i, 1024 * 1024); }
     }
 
     void LogMessages(const std::vector<LogMessage>& messages) {
diff --git a/logd/LogKlog.cpp b/logd/LogKlog.cpp
index dbdf7fd..d6c7d25 100644
--- a/logd/LogKlog.cpp
+++ b/logd/LogKlog.cpp
@@ -381,8 +381,8 @@
         }
         if ((i == 9) && (cp[i] == ' ')) {
             int pid = 0;
-            char dummy;
-            if (sscanf(cp + 4, "%d%c", &pid, &dummy) == 2) {
+            char placeholder;
+            if (sscanf(cp + 4, "%d%c", &pid, &placeholder) == 2) {
                 buf = cp + 10;  // skip-it-all
                 return pid;
             }
@@ -392,8 +392,8 @@
         // Mediatek kernels with modified printk
         if (*cp == '[') {
             int pid = 0;
-            char dummy;
-            if (sscanf(cp, "[%d:%*[a-z_./0-9:A-Z]]%c", &pid, &dummy) == 2) {
+            char placeholder;
+            if (sscanf(cp, "[%d:%*[a-z_./0-9:A-Z]]%c", &pid, &placeholder) == 2) {
                 return pid;
             }
             break;  // Only the first one
@@ -703,7 +703,7 @@
         p = " ";
         b = 1;
     }
-    // paranoid sanity check, can not happen ...
+    // This shouldn't happen, but clamp the size if it does.
     if (b > LOGGER_ENTRY_MAX_PAYLOAD) {
         b = LOGGER_ENTRY_MAX_PAYLOAD;
     }
@@ -712,7 +712,7 @@
     }
     // calculate buffer copy requirements
     ssize_t n = 1 + taglen + 1 + b + 1;
-    // paranoid sanity check, first two just can not happen ...
+    // Extra checks for likely impossible cases.
     if ((taglen > n) || (b > n) || (n > (ssize_t)USHRT_MAX) || (n <= 0)) {
         return -EINVAL;
     }
@@ -722,7 +722,7 @@
     // If we malloc'd this buffer, we could get away without n's USHRT_MAX
     // test above, but we would then required a max(n, USHRT_MAX) as
     // truncating length argument to logbuf->log() below. Gain is protection
-    // of stack sanity and speedup, loss is truncated long-line content.
+    // against stack corruption and speedup, loss is truncated long-line content.
     char newstr[n];
     char* np = newstr;
 
diff --git a/logd/LogSize.cpp b/logd/LogSize.cpp
new file mode 100644
index 0000000..fe829ba
--- /dev/null
+++ b/logd/LogSize.cpp
@@ -0,0 +1,68 @@
+/*
+ * Copyright 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 <LogSize.h>
+
+#include <array>
+#include <optional>
+#include <string>
+
+#include <android-base/parseint.h>
+#include <android-base/properties.h>
+
+bool IsValidBufferSize(size_t value) {
+    return kLogBufferMinSize <= value && value <= kLogBufferMaxSize;
+}
+
+static std::optional<size_t> GetBufferSizeProperty(const std::string& key) {
+    std::string value = android::base::GetProperty(key, "");
+    if (value.empty()) {
+        return {};
+    }
+
+    uint32_t size;
+    if (!android::base::ParseByteCount(value, &size)) {
+        return {};
+    }
+
+    if (!IsValidBufferSize(size)) {
+        return {};
+    }
+
+    return size;
+}
+
+size_t GetBufferSizeFromProperties(log_id_t log_id) {
+    std::string buffer_name = android_log_id_to_name(log_id);
+    std::array<std::string, 4> properties = {
+            "persist.logd.size." + buffer_name,
+            "ro.logd.size." + buffer_name,
+            "persist.logd.size",
+            "ro.logd.size",
+    };
+
+    for (const auto& property : properties) {
+        if (auto size = GetBufferSizeProperty(property)) {
+            return *size;
+        }
+    }
+
+    if (android::base::GetBoolProperty("ro.config.low_ram", false)) {
+        return kLogBufferMinSize;
+    }
+
+    return kDefaultLogBufferSize;
+}
diff --git a/logd/LogSize.h b/logd/LogSize.h
new file mode 100644
index 0000000..d5716ff
--- /dev/null
+++ b/logd/LogSize.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright 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.
+ */
+
+#pragma once
+
+#include <stddef.h>
+
+#include <log/log.h>
+
+static constexpr size_t kDefaultLogBufferSize = 256 * 1024;
+static constexpr size_t kLogBufferMinSize = 64 * 1024;
+static constexpr size_t kLogBufferMaxSize = 256 * 1024 * 1024;
+
+bool IsValidBufferSize(size_t value);
+
+// This returns the buffer size as set in system properties for use in LogBuffer::Init().
+// Note that `logcat -G` calls LogBuffer::SetSize(), which configures log buffer sizes without
+// setting these properties, so this function should never be used except for LogBuffer::Init().
+// LogBuffer::GetSize() should be used instead within logd.  Other processes can use
+// android_logger_get_log_size() or `logcat -g` to query the actual allotted buffer size.
+size_t GetBufferSizeFromProperties(log_id_t log_id);
diff --git a/logd/LogStatistics.cpp b/logd/LogStatistics.cpp
index 1705d48..87069b3 100644
--- a/logd/LogStatistics.cpp
+++ b/logd/LogStatistics.cpp
@@ -26,8 +26,10 @@
 #include <unistd.h>
 
 #include <list>
+#include <vector>
 
 #include <android-base/logging.h>
+#include <android-base/strings.h>
 #include <private/android_logger.h>
 
 #include "LogBufferElement.h"
@@ -61,7 +63,8 @@
     return std::string(msg, len);
 }
 
-LogStatistics::LogStatistics(bool enable_statistics, bool track_total_size)
+LogStatistics::LogStatistics(bool enable_statistics, bool track_total_size,
+                             std::optional<log_time> start_time)
     : enable(enable_statistics), track_total_size_(track_total_size) {
     log_time now(CLOCK_REALTIME);
     log_id_for_each(id) {
@@ -70,8 +73,13 @@
         mDroppedElements[id] = 0;
         mSizesTotal[id] = 0;
         mElementsTotal[id] = 0;
-        mOldest[id] = now;
-        mNewest[id] = now;
+        if (start_time) {
+            mOldest[id] = *start_time;
+            mNewest[id] = *start_time;
+        } else {
+            mOldest[id] = now;
+            mNewest[id] = now;
+        }
         mNewestDropped[id] = now;
     }
 }
@@ -784,6 +792,31 @@
     return output;
 }
 
+std::string LogStatistics::ReportInteresting() const {
+    auto lock = std::lock_guard{lock_};
+
+    std::vector<std::string> items;
+
+    log_id_for_each(i) { items.emplace_back(std::to_string(mElements[i])); }
+
+    log_id_for_each(i) { items.emplace_back(std::to_string(mSizes[i])); }
+
+    log_id_for_each(i) {
+        items.emplace_back(std::to_string(overhead_[i] ? *overhead_[i] : mSizes[i]));
+    }
+
+    log_id_for_each(i) {
+        uint64_t oldest = mOldest[i].msec() / 1000;
+        uint64_t newest = mNewest[i].msec() / 1000;
+
+        int span = newest - oldest;
+
+        items.emplace_back(std::to_string(span));
+    }
+
+    return android::base::Join(items, ",");
+}
+
 std::string LogStatistics::Format(uid_t uid, pid_t pid, unsigned int logMask) const {
     auto lock = std::lock_guard{lock_};
 
diff --git a/logd/LogStatistics.h b/logd/LogStatistics.h
index d440a8c..faf9283 100644
--- a/logd/LogStatistics.h
+++ b/logd/LogStatistics.h
@@ -515,7 +515,8 @@
     }
 
   public:
-    LogStatistics(bool enable_statistics, bool track_total_size);
+    LogStatistics(bool enable_statistics, bool track_total_size,
+                  std::optional<log_time> start_time = {});
 
     void AddTotal(log_id_t log_id, uint16_t size) EXCLUDES(lock_);
 
@@ -543,7 +544,7 @@
     bool ShouldPrune(log_id id, unsigned long max_size, unsigned long* prune_rows) const
             EXCLUDES(lock_);
 
-    // Snapshot of the sizes for a given log buffer.
+    // Return the consumed size of the given buffer.
     size_t Sizes(log_id_t id) const EXCLUDES(lock_) {
         auto lock = std::lock_guard{lock_};
         if (overhead_[id]) {
@@ -551,11 +552,19 @@
         }
         return mSizes[id];
     }
+
+    // Return the uncompressed size of the contents of the given buffer.
+    size_t SizeReadable(log_id_t id) const EXCLUDES(lock_) {
+        auto lock = std::lock_guard{lock_};
+        return mSizes[id];
+    }
+
     // TODO: Get rid of this entirely.
     static size_t sizesTotal() {
         return SizesTotal;
     }
 
+    std::string ReportInteresting() const EXCLUDES(lock_);
     std::string Format(uid_t uid, pid_t pid, unsigned int logMask) const EXCLUDES(lock_);
 
     const char* PidToName(pid_t pid) const EXCLUDES(lock_);
diff --git a/logd/README.property b/logd/README.property
index 1d7d990..8fd7f48 100644
--- a/logd/README.property
+++ b/logd/README.property
@@ -7,8 +7,8 @@
 ro.logd.auditd.events      bool   true   selinux audit messages sent to events.
 persist.logd.security      bool   false  Enable security buffer.
 ro.organization_owned      bool   false  Override persist.logd.security to false
-ro.logd.kernel             bool+ svelte+ Enable klogd daemon
-ro.logd.statistics         bool+ svelte+ Enable logcat -S statistics.
+ro.logd.kernel             bool  svelte+ Enable klogd daemon
+logd.statistics            bool  svelte+ Enable logcat -S statistics.
 ro.debuggable              number        if not "1", logd.statistics &
                                          ro.logd.kernel default false.
 logd.logpersistd.enable    bool   auto   Safe to start logpersist daemon service
@@ -57,11 +57,8 @@
 
 NB:
 - auto - managed by /init
-- bool+ - "true", "false" and comma separated list of "eng" (forced false if
-  ro.debuggable is not "1") or "svelte" (forced false if ro.config.low_ram is
-  true).
 - svelte - see ro.config.low_ram for details.
-- svelte+ - see ro.config.low_ram and ro.debuggable for details.
+- svelte+ - If empty, default to true if `ro.config.low_ram == false && ro.debuggable == true`
 - ro - <base property> temporary override, ro.<base property> platform default.
 - persist - <base property> override, persist.<base property> platform default.
 - build - VERBOSE for native, DEBUG for jvm isLoggable, or developer option.
diff --git a/logd/README.replay.md b/logd/README.replay.md
new file mode 100644
index 0000000..5f7ec9e
--- /dev/null
+++ b/logd/README.replay.md
@@ -0,0 +1,46 @@
+logd can record and replay log messages for offline analysis.
+
+Recording Messages
+------------------
+
+logd has a `RecordingLogBuffer` buffer that records messages to /data/misc/logd/recorded-messages.
+It stores messages in memory until that file is accessible, in order to capture all messages since
+the beginning of boot.  It is only meant for logging developers to use and must be manually enabled
+in by adding `RecordingLogBuffer.cpp` to `Android.bp` and setting
+`log_buffer = new SimpleLogBuffer(&reader_list, &log_tags, &log_statistics);` in `main.cpp`.
+
+Recording messages may delay the Log() function from completing and it is highly recommended to make
+the logd socket in `liblog` blocking, by removing `SOCK_NONBLOCK` from the `socket()` call in
+`liblog/logd_writer.cpp`.
+
+Replaying Messages
+------------------
+
+Recorded messages can be replayed offline with the `replay_messages` tool.  It runs on host and
+device and supports the following options:
+
+1. `interesting` - this prints 'interesting' statistics for each of the log buffer types (simple,
+   chatty, serialized).  The statistics are:
+    1. Log Entry Count
+    2. Size (the uncompressed size of the log messages in bytes)
+    3. Overhead (the total cost of the log messages in memory in bytes)
+    4. Range (the range of time that the logs cover in seconds)
+2. `memory_usage BUFFER_TYPE` - this prints the memory usage (sum of private dirty pages of the
+  `replay_messages` process).  Note that the input file is mmap()'ed as RO/Shared so it does not
+  appear in these dirty pages, and a baseline is taken before allocating the log buffers, so only
+  their contributions are measured.  The tool outputs the memory usage every 100,000 messages.
+3. `latency BUFFER_TYPE` - this prints statistics of the latency of the Log() function for the given
+  buffer type.  It specifically prints the 1st, 2nd, and 3rd quartiles; the 95th, 99th, and 99.99th
+  percentiles; and the maximum latency.
+4. `print_logs BUFFER_TYPE [buffers] [print_point]` - this prints the logs as processed by the given
+  buffer_type from the buffers specified by `buffers` starting after the number of logs specified by
+  `print_point` have been logged.  This acts as if a user called `logcat` immediately after the
+  specified logs have been logged, which is particularly useful since it will show the chatty
+  pruning messages at that point.  It additionally prints the statistics from `logcat -S` after the
+  logs.
+  `buffers` is a comma separated list of the numeric buffer id values from `<android/log.h>`.  For
+  example, `0,1,3` represents the main, radio, and system buffers.  It can can also be `all`.
+  `print_point` is an positive integer.  If it is unspecified, logs are printed after the entire
+  input file is consumed.
+5. `nothing BUFFER_TYPE` - this does nothing other than read the input file and call Log() for the
+  given buffer type.  This is used for profiling CPU usage of strictly the log buffer.
diff --git a/trusty/libtrusty/tipc_ioctl.h b/logd/RecordedLogMessage.h
similarity index 65%
rename from trusty/libtrusty/tipc_ioctl.h
rename to logd/RecordedLogMessage.h
index 27da56a..f18c422 100644
--- a/trusty/libtrusty/tipc_ioctl.h
+++ b/logd/RecordedLogMessage.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2015 The Android Open Source Project
+ * 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.
@@ -14,13 +14,17 @@
  * limitations under the License.
  */
 
-#ifndef _TIPC_IOCTL_H
-#define _TIPC_IOCTL_H
+#pragma once
 
-#include <linux/ioctl.h>
-#include <linux/types.h>
+#include <inttypes.h>
 
-#define TIPC_IOC_MAGIC			'r'
-#define TIPC_IOC_CONNECT		_IOW(TIPC_IOC_MAGIC, 0x80, char *)
+#include <log/log_time.h>
 
-#endif
+struct __attribute__((packed)) RecordedLogMessage {
+    uint32_t uid;
+    uint32_t pid;
+    uint32_t tid;
+    log_time realtime;
+    uint16_t msg_len;
+    uint8_t log_id;
+};
diff --git a/logd/RecordingLogBuffer.cpp b/logd/RecordingLogBuffer.cpp
new file mode 100644
index 0000000..f5991f3
--- /dev/null
+++ b/logd/RecordingLogBuffer.cpp
@@ -0,0 +1,62 @@
+/*
+ * 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 "RecordingLogBuffer.h"
+
+#include <android-base/file.h>
+
+static void WriteLogMessage(int fd, const RecordedLogMessage& meta, const std::string& msg) {
+    android::base::WriteFully(fd, &meta, sizeof(meta));
+    android::base::WriteFully(fd, msg.c_str(), meta.msg_len);
+}
+
+void RecordingLogBuffer::RecordLogMessage(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid,
+                                          pid_t tid, const char* msg, uint16_t len) {
+    auto lock = std::lock_guard{lock_};
+    if (len > LOGGER_ENTRY_MAX_PAYLOAD) {
+        len = LOGGER_ENTRY_MAX_PAYLOAD;
+    }
+
+    RecordedLogMessage recorded_log_message = {
+            .uid = uid,
+            .pid = static_cast<uint32_t>(pid),
+            .tid = static_cast<uint32_t>(tid),
+            .realtime = realtime,
+            .msg_len = len,
+            .log_id = static_cast<uint8_t>(log_id),
+    };
+
+    if (!fd_.ok()) {
+        fd_.reset(open("/data/misc/logd/recorded-messages",
+                       O_WRONLY | O_CREAT | O_APPEND | O_CLOEXEC, 0666));
+        if (!fd_.ok()) {
+            since_boot_messages_.emplace_back(recorded_log_message, std::string(msg, len));
+            return;
+        } else {
+            for (const auto& [meta, msg] : since_boot_messages_) {
+                WriteLogMessage(fd_.get(), meta, msg);
+            }
+        }
+    }
+
+    WriteLogMessage(fd_.get(), recorded_log_message, std::string(msg, len));
+}
+
+int RecordingLogBuffer::Log(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid, pid_t tid,
+                            const char* msg, uint16_t len) {
+    RecordLogMessage(log_id, realtime, uid, pid, tid, msg, len);
+    return SimpleLogBuffer::Log(log_id, realtime, uid, pid, tid, msg, len);
+}
\ No newline at end of file
diff --git a/logd/RecordingLogBuffer.h b/logd/RecordingLogBuffer.h
new file mode 100644
index 0000000..49a0aba
--- /dev/null
+++ b/logd/RecordingLogBuffer.h
@@ -0,0 +1,43 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+#include "SimpleLogBuffer.h"
+
+#include <string>
+#include <tuple>
+#include <vector>
+
+#include <android-base/unique_fd.h>
+
+#include "RecordedLogMessage.h"
+
+class RecordingLogBuffer : public SimpleLogBuffer {
+  public:
+    RecordingLogBuffer(LogReaderList* reader_list, LogTags* tags, LogStatistics* stats)
+        : SimpleLogBuffer(reader_list, tags, stats) {}
+
+    int Log(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid, pid_t tid, const char* msg,
+            uint16_t len) override;
+
+  private:
+    void RecordLogMessage(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid, pid_t tid,
+                          const char* msg, uint16_t len);
+
+    std::vector<std::pair<RecordedLogMessage, std::string>> since_boot_messages_;
+    android::base::unique_fd fd_;
+};
diff --git a/logd/ReplayMessages.cpp b/logd/ReplayMessages.cpp
new file mode 100644
index 0000000..56509ec
--- /dev/null
+++ b/logd/ReplayMessages.cpp
@@ -0,0 +1,472 @@
+/*
+ * 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 <inttypes.h>
+
+#include <chrono>
+#include <map>
+
+#include <android-base/file.h>
+#include <android-base/mapped_file.h>
+#include <android-base/parseint.h>
+#include <android-base/strings.h>
+#include <android-base/unique_fd.h>
+#include <android/log.h>
+#include <log/log_time.h>
+#include <log/logprint.h>
+
+#include "ChattyLogBuffer.h"
+#include "LogBuffer.h"
+#include "LogStatistics.h"
+#include "RecordedLogMessage.h"
+#include "SerializedLogBuffer.h"
+#include "SimpleLogBuffer.h"
+
+using android::base::MappedFile;
+using android::base::ParseInt;
+using android::base::ParseUint;
+using android::base::Split;
+
+char* android::uidToName(uid_t) {
+    return nullptr;
+}
+
+static size_t GetPrivateDirty() {
+    // Allocate once and hope that we don't need to reallocate >40000, to prevent heap fragmentation
+    static std::string smaps(40000, '\0');
+    android::base::ReadFileToString("/proc/self/smaps", &smaps);
+
+    size_t result = 0;
+    size_t base = 0;
+    size_t found;
+    while (true) {
+        found = smaps.find("Private_Dirty:", base);
+        if (found == smaps.npos) break;
+
+        found += sizeof("Private_Dirty:");
+
+        result += atoi(&smaps[found]);
+
+        base = found + 1;
+    }
+
+    return result;
+}
+
+static AndroidLogFormat* GetLogFormat() {
+    static AndroidLogFormat* format = [] {
+        auto* format = android_log_format_new();
+        android_log_setPrintFormat(format, android_log_formatFromString("threadtime"));
+        android_log_setPrintFormat(format, android_log_formatFromString("uid"));
+        return format;
+    }();
+    return format;
+}
+
+static void PrintMessage(struct log_msg* buf) {
+    bool is_binary =
+            buf->id() == LOG_ID_EVENTS || buf->id() == LOG_ID_STATS || buf->id() == LOG_ID_SECURITY;
+
+    AndroidLogEntry entry;
+    int err;
+    if (is_binary) {
+        char binaryMsgBuf[1024];
+        err = android_log_processBinaryLogBuffer(&buf->entry, &entry, nullptr, binaryMsgBuf,
+                                                 sizeof(binaryMsgBuf));
+    } else {
+        err = android_log_processLogBuffer(&buf->entry, &entry);
+    }
+    if (err < 0) {
+        fprintf(stderr, "Error parsing log message\n");
+    }
+
+    android_log_printLogLine(GetLogFormat(), STDOUT_FILENO, &entry);
+}
+
+static log_time GetFirstTimeStamp(const MappedFile& recorded_messages) {
+    if (sizeof(RecordedLogMessage) >= recorded_messages.size()) {
+        fprintf(stderr, "At least one log message must be present in the input\n");
+        exit(1);
+    }
+
+    auto* meta = reinterpret_cast<RecordedLogMessage*>(recorded_messages.data());
+    return meta->realtime;
+}
+
+static LogMask BuffersToLogMask(const char* buffers) {
+    if (buffers == nullptr || !strcmp(buffers, "all")) {
+        return kLogMaskAll;
+    }
+    auto string_ids = Split(buffers, ",");
+    LogMask log_mask = 0;
+    for (const auto& string_id : string_ids) {
+        int buffer_id;
+        if (!ParseInt(string_id, &buffer_id, 0, 7)) {
+            fprintf(stderr, "Could not parse buffer_id '%s'\n", string_id.c_str());
+            exit(1);
+        }
+        log_mask |= 1 << buffer_id;
+    }
+    return log_mask;
+}
+
+class StdoutWriter : public LogWriter {
+  public:
+    StdoutWriter() : LogWriter(0, true) {}
+    bool Write(const logger_entry& entry, const char* message) override {
+        struct log_msg log_msg;
+        log_msg.entry = entry;
+        if (log_msg.entry.len > LOGGER_ENTRY_MAX_PAYLOAD) {
+            fprintf(stderr, "payload too large %" PRIu16, log_msg.entry.len);
+            exit(1);
+        }
+        memcpy(log_msg.msg(), message, log_msg.entry.len);
+
+        PrintMessage(&log_msg);
+
+        return true;
+    }
+
+    void Shutdown() override {
+        fprintf(stderr, "LogWriter::Shutdown() called\n");
+        exit(1);
+    }
+
+    std::string name() const override { return "stdout writer"; }
+};
+
+class Operation {
+  public:
+    virtual ~Operation() {}
+
+    virtual void Begin() {}
+    virtual void Log(const RecordedLogMessage& meta, const char* msg) = 0;
+    virtual void End() {}
+};
+
+class PrintInteresting : public Operation {
+  public:
+    PrintInteresting(log_time first_log_timestamp)
+        : stats_simple_{false, false, first_log_timestamp},
+          stats_chatty_{false, false, first_log_timestamp},
+          stats_serialized_{false, true, first_log_timestamp} {}
+
+    void Begin() override {
+        printf("message_count,simple_main_lines,simple_radio_lines,simple_events_lines,simple_"
+               "system_lines,simple_crash_lines,simple_stats_lines,simple_security_lines,simple_"
+               "kernel_lines,simple_main_size,simple_radio_size,simple_events_size,simple_system_"
+               "size,simple_crash_size,simple_stats_size,simple_security_size,simple_kernel_size,"
+               "simple_main_overhead,simple_radio_overhead,simple_events_overhead,simple_system_"
+               "overhead,simple_crash_overhead,simple_stats_overhead,simple_security_overhead,"
+               "simple_kernel_overhead,simple_main_range,simple_radio_range,simple_events_range,"
+               "simple_system_range,simple_crash_range,simple_stats_range,simple_security_range,"
+               "simple_kernel_range,chatty_main_lines,chatty_radio_lines,chatty_events_lines,"
+               "chatty_system_lines,chatty_crash_lines,chatty_stats_lines,chatty_security_lines,"
+               "chatty_"
+               "kernel_lines,chatty_main_size,chatty_radio_size,chatty_events_size,chatty_system_"
+               "size,chatty_crash_size,chatty_stats_size,chatty_security_size,chatty_kernel_size,"
+               "chatty_main_overhead,chatty_radio_overhead,chatty_events_overhead,chatty_system_"
+               "overhead,chatty_crash_overhead,chatty_stats_overhead,chatty_security_overhead,"
+               "chatty_kernel_overhead,chatty_main_range,chatty_radio_range,chatty_events_range,"
+               "chatty_system_range,chatty_crash_range,chatty_stats_range,chatty_security_range,"
+               "chatty_kernel_range,serialized_main_lines,serialized_radio_lines,serialized_events_"
+               "lines,serialized_"
+               "system_lines,serialized_crash_lines,serialized_stats_lines,serialized_security_"
+               "lines,serialized_"
+               "kernel_lines,serialized_main_size,serialized_radio_size,serialized_events_size,"
+               "serialized_system_"
+               "size,serialized_crash_size,serialized_stats_size,serialized_security_size,"
+               "serialized_kernel_size,"
+               "serialized_main_overhead,serialized_radio_overhead,serialized_events_overhead,"
+               "serialized_system_"
+               "overhead,serialized_crash_overhead,serialized_stats_overhead,serialized_security_"
+               "overhead,"
+               "serialized_kernel_overhead,serialized_main_range,serialized_radio_range,serialized_"
+               "events_range,"
+               "serialized_system_range,serialized_crash_range,serialized_stats_range,serialized_"
+               "security_range,"
+               "serialized_kernel_range\n");
+    }
+
+    void Log(const RecordedLogMessage& meta, const char* msg) override {
+        simple_log_buffer_.Log(static_cast<log_id_t>(meta.log_id), meta.realtime, meta.uid,
+                               meta.pid, meta.tid, msg, meta.msg_len);
+
+        chatty_log_buffer_.Log(static_cast<log_id_t>(meta.log_id), meta.realtime, meta.uid,
+                               meta.pid, meta.tid, msg, meta.msg_len);
+
+        serialized_log_buffer_.Log(static_cast<log_id_t>(meta.log_id), meta.realtime, meta.uid,
+                                   meta.pid, meta.tid, msg, meta.msg_len);
+
+        if (num_message_ % 10000 == 0) {
+            printf("%" PRIu64 ",%s,%s,%s\n", num_message_,
+                   stats_simple_.ReportInteresting().c_str(),
+                   stats_chatty_.ReportInteresting().c_str(),
+                   stats_serialized_.ReportInteresting().c_str());
+        }
+
+        num_message_++;
+    }
+
+  private:
+    uint64_t num_message_ = 1;
+
+    LogReaderList reader_list_;
+    LogTags tags_;
+    PruneList prune_list_;
+
+    LogStatistics stats_simple_;
+    SimpleLogBuffer simple_log_buffer_{&reader_list_, &tags_, &stats_simple_};
+
+    LogStatistics stats_chatty_;
+    ChattyLogBuffer chatty_log_buffer_{&reader_list_, &tags_, &prune_list_, &stats_chatty_};
+
+    LogStatistics stats_serialized_;
+    SerializedLogBuffer serialized_log_buffer_{&reader_list_, &tags_, &stats_serialized_};
+};
+
+class SingleBufferOperation : public Operation {
+  public:
+    SingleBufferOperation(log_time first_log_timestamp, const char* buffer) {
+        if (!strcmp(buffer, "simple")) {
+            stats_.reset(new LogStatistics{false, false, first_log_timestamp});
+            log_buffer_.reset(new SimpleLogBuffer(&reader_list_, &tags_, stats_.get()));
+        } else if (!strcmp(buffer, "chatty")) {
+            stats_.reset(new LogStatistics{false, false, first_log_timestamp});
+            log_buffer_.reset(
+                    new ChattyLogBuffer(&reader_list_, &tags_, &prune_list_, stats_.get()));
+        } else if (!strcmp(buffer, "serialized")) {
+            stats_.reset(new LogStatistics{false, true, first_log_timestamp});
+            log_buffer_.reset(new SerializedLogBuffer(&reader_list_, &tags_, stats_.get()));
+        } else {
+            fprintf(stderr, "invalid log buffer type '%s'\n", buffer);
+            abort();
+        }
+    }
+
+    void Log(const RecordedLogMessage& meta, const char* msg) override {
+        PreOperation();
+        log_buffer_->Log(static_cast<log_id_t>(meta.log_id), meta.realtime, meta.uid, meta.pid,
+                         meta.tid, msg, meta.msg_len);
+
+        Operation();
+
+        num_message_++;
+    }
+
+    virtual void PreOperation() {}
+    virtual void Operation() {}
+
+  protected:
+    uint64_t num_message_ = 1;
+
+    LogReaderList reader_list_;
+    LogTags tags_;
+    PruneList prune_list_;
+
+    std::unique_ptr<LogStatistics> stats_;
+    std::unique_ptr<LogBuffer> log_buffer_;
+};
+
+class PrintMemory : public SingleBufferOperation {
+  public:
+    PrintMemory(log_time first_log_timestamp, const char* buffer)
+        : SingleBufferOperation(first_log_timestamp, buffer) {}
+
+    void Operation() override {
+        if (num_message_ % 100000 == 0) {
+            printf("%" PRIu64 ",%s\n", num_message_,
+                   std::to_string(GetPrivateDirty() - baseline_memory_).c_str());
+        }
+    }
+
+  private:
+    size_t baseline_memory_ = GetPrivateDirty();
+};
+
+class PrintLogs : public SingleBufferOperation {
+  public:
+    PrintLogs(log_time first_log_timestamp, const char* buffer, const char* buffers,
+              const char* print_point)
+        : SingleBufferOperation(first_log_timestamp, buffer) {
+        mask_ = BuffersToLogMask(buffers);
+        if (print_point != nullptr) {
+            uint64_t result = 0;
+            if (!ParseUint(print_point, &result)) {
+                fprintf(stderr, "Could not parse print point '%s'\n", print_point);
+                exit(1);
+            }
+            print_point_ = result;
+        }
+    }
+
+    void Operation() override {
+        if (print_point_ && num_message_ >= *print_point_) {
+            End();
+            exit(0);
+        }
+    }
+
+    void End() override {
+        std::unique_ptr<LogWriter> test_writer(new StdoutWriter());
+        std::unique_ptr<FlushToState> flush_to_state = log_buffer_->CreateFlushToState(1, mask_);
+        log_buffer_->FlushTo(test_writer.get(), *flush_to_state, nullptr);
+
+        auto stats_string = stats_->Format(0, 0, mask_);
+        printf("%s\n", stats_string.c_str());
+    }
+
+  private:
+    LogMask mask_ = kLogMaskAll;
+    std::optional<uint64_t> print_point_;
+};
+
+class PrintLatency : public SingleBufferOperation {
+  public:
+    PrintLatency(log_time first_log_timestamp, const char* buffer)
+        : SingleBufferOperation(first_log_timestamp, buffer) {}
+
+    void PreOperation() override { operation_start_ = std::chrono::steady_clock::now(); }
+
+    void Operation() override {
+        auto end = std::chrono::steady_clock::now();
+        auto duration = (end - operation_start_).count();
+        durations_.emplace_back(duration);
+    }
+
+    void End() override {
+        std::sort(durations_.begin(), durations_.end());
+        auto q1 = durations_.size() / 4;
+        auto q2 = durations_.size() / 2;
+        auto q3 = 3 * durations_.size() / 4;
+
+        auto p95 = 95 * durations_.size() / 100;
+        auto p99 = 99 * durations_.size() / 100;
+        auto p9999 = 9999 * durations_.size() / 10000;
+
+        printf("q1: %lld q2: %lld q3: %lld  p95: %lld p99: %lld p99.99: %lld  max: %lld\n",
+               durations_[q1], durations_[q2], durations_[q3], durations_[p95], durations_[p99],
+               durations_[p9999], durations_.back());
+    }
+
+  private:
+    std::chrono::steady_clock::time_point operation_start_;
+    std::vector<long long> durations_;
+};
+
+class PrintAllLogs : public SingleBufferOperation {
+  public:
+    PrintAllLogs(log_time first_log_timestamp, const char* buffer, const char* buffers)
+        : SingleBufferOperation(first_log_timestamp, buffer) {
+        LogMask mask = BuffersToLogMask(buffers);
+        auto lock = std::unique_lock{reader_list_.reader_threads_lock()};
+        std::unique_ptr<LogWriter> stdout_writer(new StdoutWriter());
+        std::unique_ptr<LogReaderThread> log_reader(
+                new LogReaderThread(log_buffer_.get(), &reader_list_, std::move(stdout_writer),
+                                    false, 0, mask, 0, {}, 1, {}));
+        reader_list_.reader_threads().emplace_back(std::move(log_reader));
+    }
+
+    void Operation() override {
+        // If the rate of reading logs is slower than the rate of incoming logs, then the reader
+        // thread is disconnected to not overflow log buffers, therefore we artificially slow down
+        // the incoming log rate.
+        usleep(100);
+    }
+};
+
+int main(int argc, char** argv) {
+    if (argc < 3) {
+        fprintf(stderr, "Usage: %s FILE OPERATION [BUFFER] [OPTIONS]\n", argv[0]);
+        return 1;
+    }
+
+    if (strcmp(argv[2], "interesting") != 0 && argc < 4) {
+        fprintf(stderr, "Operations other than 'interesting' require a BUFFER argument\n");
+        return 1;
+    }
+
+    int recorded_messages_fd = open(argv[1], O_RDONLY);
+    if (recorded_messages_fd == -1) {
+        fprintf(stderr, "Couldn't open input file\n");
+        return 1;
+    }
+    struct stat fd_stat;
+    if (fstat(recorded_messages_fd, &fd_stat) != 0) {
+        fprintf(stderr, "Couldn't fstat input file\n");
+        return 1;
+    }
+    auto recorded_messages = MappedFile::FromFd(recorded_messages_fd, 0,
+                                                static_cast<size_t>(fd_stat.st_size), PROT_READ);
+    if (recorded_messages == nullptr) {
+        fprintf(stderr, "Couldn't mmap input file\n");
+        return 1;
+    }
+
+    // LogStatistics typically uses 'now()' to initialize its log range state, but this doesn't work
+    // when replaying older logs, so we instead give it the timestamp from the first log.
+    log_time first_log_timestamp = GetFirstTimeStamp(*recorded_messages);
+
+    std::unique_ptr<Operation> operation;
+    if (!strcmp(argv[2], "interesting")) {
+        operation.reset(new PrintInteresting(first_log_timestamp));
+    } else if (!strcmp(argv[2], "memory_usage")) {
+        operation.reset(new PrintMemory(first_log_timestamp, argv[3]));
+    } else if (!strcmp(argv[2], "latency")) {
+        operation.reset(new PrintLatency(first_log_timestamp, argv[3]));
+    } else if (!strcmp(argv[2], "print_logs")) {
+        operation.reset(new PrintLogs(first_log_timestamp, argv[3], argc > 4 ? argv[4] : nullptr,
+                                      argc > 5 ? argv[5] : nullptr));
+    } else if (!strcmp(argv[2], "print_all_logs")) {
+        operation.reset(
+                new PrintAllLogs(first_log_timestamp, argv[3], argc > 4 ? argv[4] : nullptr));
+    } else if (!strcmp(argv[2], "nothing")) {
+        operation.reset(new SingleBufferOperation(first_log_timestamp, argv[3]));
+    } else {
+        fprintf(stderr, "unknown operation '%s'\n", argv[2]);
+        return 1;
+    }
+
+    // LogBuffer::Log() won't log without this on host.
+    __android_log_set_minimum_priority(ANDROID_LOG_VERBOSE);
+    // But we still want to suppress messages <= error to not interrupt the rest of the output.
+    __android_log_set_logger([](const struct __android_log_message* log_message) {
+        if (log_message->priority < ANDROID_LOG_ERROR) {
+            return;
+        }
+        __android_log_stderr_logger(log_message);
+    });
+
+    operation->Begin();
+
+    uint64_t read_position = 0;
+    while (read_position + sizeof(RecordedLogMessage) < recorded_messages->size()) {
+        auto* meta =
+                reinterpret_cast<RecordedLogMessage*>(recorded_messages->data() + read_position);
+        if (read_position + sizeof(RecordedLogMessage) + meta->msg_len >=
+            recorded_messages->size()) {
+            break;
+        }
+        char* msg = recorded_messages->data() + read_position + sizeof(RecordedLogMessage);
+        read_position += sizeof(RecordedLogMessage) + meta->msg_len;
+
+        operation->Log(*meta, msg);
+    }
+
+    operation->End();
+
+    return 0;
+}
diff --git a/logd/SerializedFlushToState.cpp b/logd/SerializedFlushToState.cpp
index 2633348..b02ccc3 100644
--- a/logd/SerializedFlushToState.cpp
+++ b/logd/SerializedFlushToState.cpp
@@ -31,7 +31,7 @@
 SerializedFlushToState::~SerializedFlushToState() {
     log_id_for_each(i) {
         if (log_positions_[i]) {
-            log_positions_[i]->buffer_it->DecReaderRefCount(true);
+            log_positions_[i]->buffer_it->DecReaderRefCount();
         }
     }
 }
@@ -78,7 +78,7 @@
             logs_needed_from_next_position_[log_id] = true;
         } else {
             // Otherwise, if there is another buffer piece, move to that and do the same check.
-            buffer_it->DecReaderRefCount(true);
+            buffer_it->DecReaderRefCount();
             ++buffer_it;
             buffer_it->IncReaderRefCount();
             log_positions_[log_id]->read_offset = 0;
@@ -134,7 +134,7 @@
     }
 
     // // Decrease the ref count since we're deleting our reference.
-    buffer_it->DecReaderRefCount(false);
+    buffer_it->DecReaderRefCount();
 
     // Delete in the reference.
     log_positions_[log_id].reset();
diff --git a/logd/SerializedLogBuffer.cpp b/logd/SerializedLogBuffer.cpp
index a626d30..65fedb0 100644
--- a/logd/SerializedLogBuffer.cpp
+++ b/logd/SerializedLogBuffer.cpp
@@ -23,6 +23,7 @@
 #include <android-base/logging.h>
 #include <android-base/scopeguard.h>
 
+#include "LogSize.h"
 #include "LogStatistics.h"
 #include "SerializedFlushToState.h"
 
@@ -34,8 +35,8 @@
 
 void SerializedLogBuffer::Init() {
     log_id_for_each(i) {
-        if (SetSize(i, __android_logger_get_buffer_size(i))) {
-            SetSize(i, LOG_BUFFER_MIN_SIZE);
+        if (!SetSize(i, GetBufferSizeFromProperties(i))) {
+            SetSize(i, kLogBufferMinSize);
         }
     }
 
@@ -123,7 +124,7 @@
         stats_->Subtract(entry->ToLogStatisticsElement(log_id));
         read_offset += entry->total_len();
     }
-    chunk.DecReaderRefCount(false);
+    chunk.DecReaderRefCount();
 }
 
 void SerializedLogBuffer::NotifyReadersOfPrune(
@@ -299,7 +300,7 @@
     return Prune(id, ULONG_MAX, uid);
 }
 
-unsigned long SerializedLogBuffer::GetSizeUsed(log_id_t id) {
+size_t SerializedLogBuffer::GetSizeUsed(log_id_t id) {
     size_t total_size = 0;
     for (const auto& chunk : logs_[id]) {
         total_size += chunk.PruneSize();
@@ -307,7 +308,7 @@
     return total_size;
 }
 
-unsigned long SerializedLogBuffer::GetSize(log_id_t id) {
+size_t SerializedLogBuffer::GetSize(log_id_t id) {
     auto lock = std::lock_guard{lock_};
     return max_size_[id];
 }
@@ -315,10 +316,10 @@
 // New SerializedLogChunk objects will be allocated according to the new size, but older one are
 // unchanged.  MaybePrune() is called on the log buffer to reduce it to an appropriate size if the
 // new size is lower.
-int SerializedLogBuffer::SetSize(log_id_t id, unsigned long size) {
+bool SerializedLogBuffer::SetSize(log_id_t id, size_t size) {
     // Reasonable limits ...
-    if (!__android_logger_valid_buffer_size(size)) {
-        return -1;
+    if (!IsValidBufferSize(size)) {
+        return false;
     }
 
     auto lock = std::lock_guard{lock_};
@@ -326,5 +327,5 @@
 
     MaybePrune(id);
 
-    return 0;
+    return true;
 }
diff --git a/logd/SerializedLogBuffer.h b/logd/SerializedLogBuffer.h
index a03050e..32fbe5e 100644
--- a/logd/SerializedLogBuffer.h
+++ b/logd/SerializedLogBuffer.h
@@ -47,8 +47,8 @@
                                                   log_time realtime)>& filter) override;
 
     bool Clear(log_id_t id, uid_t uid) override;
-    unsigned long GetSize(log_id_t id) override;
-    int SetSize(log_id_t id, unsigned long size) override;
+    size_t GetSize(log_id_t id) override;
+    bool SetSize(log_id_t id, size_t size) override;
 
     uint64_t sequence() const override { return sequence_.load(std::memory_order_relaxed); }
 
@@ -61,13 +61,13 @@
     void NotifyReadersOfPrune(log_id_t log_id, const std::list<SerializedLogChunk>::iterator& chunk)
             REQUIRES(reader_list_->reader_threads_lock());
     void RemoveChunkFromStats(log_id_t log_id, SerializedLogChunk& chunk);
-    unsigned long GetSizeUsed(log_id_t id) REQUIRES(lock_);
+    size_t GetSizeUsed(log_id_t id) REQUIRES(lock_);
 
     LogReaderList* reader_list_;
     LogTags* tags_;
     LogStatistics* stats_;
 
-    unsigned long max_size_[LOG_ID_MAX] GUARDED_BY(lock_) = {};
+    size_t max_size_[LOG_ID_MAX] GUARDED_BY(lock_) = {};
     std::list<SerializedLogChunk> logs_[LOG_ID_MAX] GUARDED_BY(lock_);
     RwLock lock_;
 
diff --git a/logd/SerializedLogChunk.cpp b/logd/SerializedLogChunk.cpp
index e444856..de641d6 100644
--- a/logd/SerializedLogChunk.cpp
+++ b/logd/SerializedLogChunk.cpp
@@ -31,7 +31,6 @@
                   << " size used: " << write_offset_
                   << " compressed size: " << compressed_log_.size();
     }
-    contents_.Resize(0);
 }
 
 // TODO: Develop a better reference counting strategy to guard against the case where the writer is
@@ -44,13 +43,13 @@
     CompressionEngine::GetInstance().Decompress(compressed_log_, contents_);
 }
 
-void SerializedLogChunk::DecReaderRefCount(bool compress) {
+void SerializedLogChunk::DecReaderRefCount() {
     CHECK_NE(reader_ref_count_, 0U);
     if (--reader_ref_count_ != 0) {
         return;
     }
-    if (compress && !writer_active_) {
-        Compress();
+    if (!writer_active_) {
+        contents_.Resize(0);
     }
 }
 
@@ -83,18 +82,19 @@
     }
 
     if (new_write_offset == 0) {
-        DecReaderRefCount(false);
+        DecReaderRefCount();
         return true;
     }
 
-    // Clear the old compressed logs and set write_offset_ appropriately for DecReaderRefCount()
-    // to compress the new partially cleared log.
+    // Clear the old compressed logs and set write_offset_ appropriately to compress the new
+    // partially cleared log.
     if (new_write_offset != write_offset_) {
         compressed_log_.Resize(0);
         write_offset_ = new_write_offset;
+        Compress();
     }
 
-    DecReaderRefCount(true);
+    DecReaderRefCount();
 
     return false;
 }
diff --git a/logd/SerializedLogChunk.h b/logd/SerializedLogChunk.h
index 50bae63..0991eac 100644
--- a/logd/SerializedLogChunk.h
+++ b/logd/SerializedLogChunk.h
@@ -30,9 +30,7 @@
 
     void Compress();
     void IncReaderRefCount();
-    // Decrease the reader ref count and compress the log if appropriate.  `compress` should only be
-    // set to false in the case that the log buffer will be deleted afterwards.
-    void DecReaderRefCount(bool compress);
+    void DecReaderRefCount();
 
     // Must have no readers referencing this.  Return true if there are no logs left in this chunk.
     bool ClearUidLogs(uid_t uid, log_id_t log_id, LogStatistics* stats);
@@ -50,8 +48,9 @@
 
     void FinishWriting() {
         writer_active_ = false;
+        Compress();
         if (reader_ref_count_ == 0) {
-            Compress();
+            contents_.Resize(0);
         }
     }
 
diff --git a/logd/SerializedLogChunkTest.cpp b/logd/SerializedLogChunkTest.cpp
index 2b478a3..f10b9c6 100644
--- a/logd/SerializedLogChunkTest.cpp
+++ b/logd/SerializedLogChunkTest.cpp
@@ -113,8 +113,7 @@
 TEST(SerializedLogChunk, catch_DecCompressedRef_CHECK) {
     size_t chunk_size = 10 * 4096;
     auto chunk = SerializedLogChunk{chunk_size};
-    EXPECT_DEATH({ chunk.DecReaderRefCount(true); }, "");
-    EXPECT_DEATH({ chunk.DecReaderRefCount(false); }, "");
+    EXPECT_DEATH({ chunk.DecReaderRefCount(); }, "");
 }
 
 // Check that the CHECK() in ClearUidLogs() if the ref count is greater than 0 is caught.
@@ -123,7 +122,7 @@
     auto chunk = SerializedLogChunk{chunk_size};
     chunk.IncReaderRefCount();
     EXPECT_DEATH({ chunk.ClearUidLogs(1000, LOG_ID_MAIN, nullptr); }, "");
-    chunk.DecReaderRefCount(false);
+    chunk.DecReaderRefCount();
 }
 
 class UidClearTest : public testing::TestWithParam<bool> {
@@ -144,7 +143,7 @@
         check(chunk_);
 
         if (finish_writing) {
-            chunk_.DecReaderRefCount(false);
+            chunk_.DecReaderRefCount();
         }
     }
 
diff --git a/logd/SimpleLogBuffer.cpp b/logd/SimpleLogBuffer.cpp
index ec08d54..b00dd25 100644
--- a/logd/SimpleLogBuffer.cpp
+++ b/logd/SimpleLogBuffer.cpp
@@ -19,6 +19,7 @@
 #include <android-base/logging.h>
 
 #include "LogBufferElement.h"
+#include "LogSize.h"
 
 SimpleLogBuffer::SimpleLogBuffer(LogReaderList* reader_list, LogTags* tags, LogStatistics* stats)
     : reader_list_(reader_list), tags_(tags), stats_(stats) {
@@ -29,8 +30,8 @@
 
 void SimpleLogBuffer::Init() {
     log_id_for_each(i) {
-        if (SetSize(i, __android_logger_get_buffer_size(i))) {
-            SetSize(i, LOG_BUFFER_MIN_SIZE);
+        if (!SetSize(i, GetBufferSizeFromProperties(i))) {
+            SetSize(i, kLogBufferMinSize);
         }
     }
 
@@ -247,22 +248,22 @@
 }
 
 // get the total space allocated to "id"
-unsigned long SimpleLogBuffer::GetSize(log_id_t id) {
+size_t SimpleLogBuffer::GetSize(log_id_t id) {
     auto lock = SharedLock{lock_};
     size_t retval = max_size_[id];
     return retval;
 }
 
 // set the total space allocated to "id"
-int SimpleLogBuffer::SetSize(log_id_t id, unsigned long size) {
+bool SimpleLogBuffer::SetSize(log_id_t id, size_t size) {
     // Reasonable limits ...
-    if (!__android_logger_valid_buffer_size(size)) {
-        return -1;
+    if (!IsValidBufferSize(size)) {
+        return false;
     }
 
     auto lock = std::lock_guard{lock_};
     max_size_[id] = size;
-    return 0;
+    return true;
 }
 
 void SimpleLogBuffer::MaybePrune(log_id_t id) {
diff --git a/logd/SimpleLogBuffer.h b/logd/SimpleLogBuffer.h
index 9f7d699..8e5b50e 100644
--- a/logd/SimpleLogBuffer.h
+++ b/logd/SimpleLogBuffer.h
@@ -41,8 +41,8 @@
                                                   log_time realtime)>& filter) override;
 
     bool Clear(log_id_t id, uid_t uid) override;
-    unsigned long GetSize(log_id_t id) override;
-    int SetSize(log_id_t id, unsigned long size) override final;
+    size_t GetSize(log_id_t id) override;
+    bool SetSize(log_id_t id, size_t size) override final;
 
     uint64_t sequence() const override { return sequence_.load(std::memory_order_relaxed); }
 
@@ -60,7 +60,7 @@
 
     LogStatistics* stats() { return stats_; }
     LogReaderList* reader_list() { return reader_list_; }
-    unsigned long max_size(log_id_t id) REQUIRES_SHARED(lock_) { return max_size_[id]; }
+    size_t max_size(log_id_t id) REQUIRES_SHARED(lock_) { return max_size_[id]; }
     std::list<LogBufferElement>& logs() { return logs_; }
 
     RwLock lock_;
@@ -75,7 +75,7 @@
 
     std::atomic<uint64_t> sequence_ = 1;
 
-    unsigned long max_size_[LOG_ID_MAX] GUARDED_BY(lock_);
+    size_t max_size_[LOG_ID_MAX] GUARDED_BY(lock_);
     std::list<LogBufferElement> logs_ GUARDED_BY(lock_);
     // Keeps track of the iterator to the oldest log message of a given log type, as an
     // optimization when pruning logs.  Use GetOldest() to retrieve.
diff --git a/logd/fuzz/log_buffer_log_fuzzer.cpp b/logd/fuzz/log_buffer_log_fuzzer.cpp
index 8309f95..d71a2f9 100644
--- a/logd/fuzz/log_buffer_log_fuzzer.cpp
+++ b/logd/fuzz/log_buffer_log_fuzzer.cpp
@@ -30,16 +30,6 @@
 #define MIN_TAG_ID 1000
 #define TAG_MOD 10
 
-#ifndef __ANDROID__
-unsigned long __android_logger_get_buffer_size(log_id_t) {
-    return 1024 * 1024;
-}
-
-bool __android_logger_valid_buffer_size(unsigned long) {
-    return true;
-}
-#endif
-
 char* android::uidToName(uid_t) {
     return strdup("fake");
 }
diff --git a/logd/logd_test.cpp b/logd/logd_test.cpp
index ed34ea4..5a0585a 100644
--- a/logd/logd_test.cpp
+++ b/logd/logd_test.cpp
@@ -162,6 +162,7 @@
 }
 #endif
 
+#ifdef LOGD_ENABLE_FLAKY_TESTS
 TEST(logd, statistics) {
 #ifdef __ANDROID__
     size_t len;
@@ -237,6 +238,7 @@
     GTEST_LOG_(INFO) << "This test does nothing.\n";
 #endif
 }
+#endif
 
 #ifdef __ANDROID__
 static void caught_signal(int /* signum */) {
@@ -720,6 +722,7 @@
 }
 #endif
 
+#ifdef LOGD_ENABLE_FLAKY_TESTS
 // b/27242723 confirmed fixed
 TEST(logd, SNDTIMEO) {
 #ifdef __ANDROID__
@@ -777,6 +780,7 @@
     GTEST_LOG_(INFO) << "This test does nothing.\n";
 #endif
 }
+#endif
 
 TEST(logd, getEventTag_list) {
 #ifdef __ANDROID__
@@ -832,127 +836,3 @@
     GTEST_LOG_(INFO) << "This test does nothing.\n";
 #endif
 }
-
-#ifdef __ANDROID__
-static inline uint32_t get4LE(const uint8_t* src) {
-  return src[0] | (src[1] << 8) | (src[2] << 16) | (src[3] << 24);
-}
-
-static inline uint32_t get4LE(const char* src) {
-  return get4LE(reinterpret_cast<const uint8_t*>(src));
-}
-#endif
-
-void __android_log_btwrite_multiple__helper(int count) {
-#ifdef __ANDROID__
-    log_time ts(CLOCK_MONOTONIC);
-    usleep(100);
-    log_time ts1(CLOCK_MONOTONIC);
-
-    // We fork to create a unique pid for the submitted log messages
-    // so that we do not collide with the other _multiple_ tests.
-
-    pid_t pid = fork();
-
-    if (pid == 0) {
-        // child
-        for (int i = count; i; --i) {
-            ASSERT_LT(
-                0, __android_log_btwrite(0, EVENT_TYPE_LONG, &ts, sizeof(ts)));
-            usleep(100);
-        }
-        ASSERT_LT(0,
-                  __android_log_btwrite(0, EVENT_TYPE_LONG, &ts1, sizeof(ts1)));
-        usleep(1000000);
-
-        _exit(0);
-    }
-
-    siginfo_t info = {};
-    ASSERT_EQ(0, TEMP_FAILURE_RETRY(waitid(P_PID, pid, &info, WEXITED)));
-    ASSERT_EQ(0, info.si_status);
-
-    struct logger_list* logger_list;
-    ASSERT_TRUE(nullptr != (logger_list = android_logger_list_open(LOG_ID_EVENTS,
-                                                                   ANDROID_LOG_NONBLOCK, 0, pid)));
-
-    int expected_count = (count < 2) ? count : 2;
-    int expected_chatty_count = (count <= 2) ? 0 : 1;
-    int expected_identical_count = (count < 2) ? 0 : (count - 2);
-    static const int expected_expire_count = 0;
-
-    count = 0;
-    int second_count = 0;
-    int chatty_count = 0;
-    int identical_count = 0;
-    int expire_count = 0;
-
-    for (;;) {
-        log_msg log_msg;
-        if (android_logger_list_read(logger_list, &log_msg) <= 0) break;
-
-        if ((log_msg.entry.pid != pid) || (log_msg.entry.len < (4 + 1 + 8)) ||
-            (log_msg.id() != LOG_ID_EVENTS))
-            continue;
-
-        char* eventData = log_msg.msg();
-        if (!eventData) continue;
-
-        uint32_t tag = get4LE(eventData);
-
-        if ((eventData[4] == EVENT_TYPE_LONG) &&
-            (log_msg.entry.len == (4 + 1 + 8))) {
-            if (tag != 0) continue;
-
-            log_time* tx = reinterpret_cast<log_time*>(eventData + 4 + 1);
-            if (ts == *tx) {
-                ++count;
-            } else if (ts1 == *tx) {
-                ++second_count;
-            }
-        } else if (eventData[4] == EVENT_TYPE_STRING) {
-            if (tag != CHATTY_LOG_TAG) continue;
-            ++chatty_count;
-            // int len = get4LE(eventData + 4 + 1);
-            log_msg.buf[LOGGER_ENTRY_MAX_LEN] = '\0';
-            const char* cp;
-            if ((cp = strstr(eventData + 4 + 1 + 4, " identical "))) {
-                unsigned val = 0;
-                sscanf(cp, " identical %u lines", &val);
-                identical_count += val;
-            } else if ((cp = strstr(eventData + 4 + 1 + 4, " expire "))) {
-                unsigned val = 0;
-                sscanf(cp, " expire %u lines", &val);
-                expire_count += val;
-            }
-        }
-    }
-
-    android_logger_list_close(logger_list);
-
-    EXPECT_EQ(expected_count, count);
-    EXPECT_EQ(1, second_count);
-    EXPECT_EQ(expected_chatty_count, chatty_count);
-    EXPECT_EQ(expected_identical_count, identical_count);
-    EXPECT_EQ(expected_expire_count, expire_count);
-#else
-    count = 0;
-    GTEST_LOG_(INFO) << "This test does nothing.\n";
-#endif
-}
-
-TEST(logd, multiple_test_1) {
-    __android_log_btwrite_multiple__helper(1);
-}
-
-TEST(logd, multiple_test_2) {
-    __android_log_btwrite_multiple__helper(2);
-}
-
-TEST(logd, multiple_test_3) {
-    __android_log_btwrite_multiple__helper(3);
-}
-
-TEST(logd, multiple_test_10) {
-    __android_log_btwrite_multiple__helper(10);
-}
diff --git a/logd/main.cpp b/logd/main.cpp
index 897e11e..c92c5b7 100644
--- a/logd/main.cpp
+++ b/logd/main.cpp
@@ -62,7 +62,9 @@
 #include "SerializedLogBuffer.h"
 #include "SimpleLogBuffer.h"
 
+using android::base::GetBoolProperty;
 using android::base::GetProperty;
+using android::base::SetProperty;
 
 #define KMSG_PRIORITY(PRI)                                 \
     '<', '0' + LOG_MAKEPRI(LOG_DAEMON, LOG_PRI(PRI)) / 10, \
@@ -82,9 +84,10 @@
         PLOG(FATAL) << "failed to set batch scheduler";
     }
 
-    if (!__android_logger_property_get_bool("ro.debuggable", BOOL_DEFAULT_FALSE) &&
-        prctl(PR_SET_DUMPABLE, 0) == -1) {
-        PLOG(FATAL) << "failed to clear PR_SET_DUMPABLE";
+    if (!GetBoolProperty("ro.debuggable", false)) {
+        if (prctl(PR_SET_DUMPABLE, 0) == -1) {
+            PLOG(FATAL) << "failed to clear PR_SET_DUMPABLE";
+        }
     }
 
     std::unique_ptr<struct _cap_struct, int (*)(void*)> caps(cap_init(), cap_free);
@@ -110,6 +113,14 @@
     }
 }
 
+// GetBoolProperty that defaults to true if `ro.debuggable == true && ro.config.low_rawm == false`.
+static bool GetBoolPropertyEngSvelteDefault(const std::string& name) {
+    bool default_value =
+            GetBoolProperty("ro.debuggable", false) && !GetBoolProperty("ro.config.low_ram", false);
+
+    return GetBoolProperty(name, default_value);
+}
+
 char* android::uidToName(uid_t u) {
     struct Userdata {
         uid_t uid;
@@ -207,6 +218,8 @@
 // logging plugins like auditd and restart control. Additional
 // transitory per-client threads are created for each reader.
 int main(int argc, char* argv[]) {
+    // We want EPIPE when a reader disconnects, not to terminate logd.
+    signal(SIGPIPE, SIG_IGN);
     // logd is written under the assumption that the timezone is UTC.
     // If TZ is not set, persist.sys.timezone is looked up in some time utility
     // libc functions, including mktime. It confuses the logd time handling,
@@ -236,10 +249,9 @@
     }
 
     int fdPmesg = -1;
-    bool klogd = __android_logger_property_get_bool(
-        "ro.logd.kernel",
-        BOOL_DEFAULT_TRUE | BOOL_DEFAULT_FLAG_ENG | BOOL_DEFAULT_FLAG_SVELTE);
+    bool klogd = GetBoolPropertyEngSvelteDefault("ro.logd.kernel");
     if (klogd) {
+        SetProperty("ro.logd.kernel", "true");
         static const char proc_kmsg[] = "/proc/kmsg";
         fdPmesg = android_get_control_file(proc_kmsg);
         if (fdPmesg < 0) {
@@ -249,7 +261,7 @@
         if (fdPmesg < 0) PLOG(ERROR) << "Failed to open " << proc_kmsg;
     }
 
-    bool auditd = __android_logger_property_get_bool("ro.logd.auditd", BOOL_DEFAULT_TRUE);
+    bool auditd = GetBoolProperty("ro.logd.auditd", true);
     DropPrivs(klogd, auditd);
 
     // A cache of event log tags
@@ -258,13 +270,11 @@
     // Pruning configuration.
     PruneList prune_list;
 
-    std::string buffer_type = GetProperty("logd.buffer_type", "chatty");
+    std::string buffer_type = GetProperty("logd.buffer_type", "serialized");
 
     // Partial (required for chatty) or full logging statistics.
-    bool enable_full_log_statistics = __android_logger_property_get_bool(
-            "logd.statistics", BOOL_DEFAULT_TRUE | BOOL_DEFAULT_FLAG_PERSIST |
-                                       BOOL_DEFAULT_FLAG_ENG | BOOL_DEFAULT_FLAG_SVELTE);
-    LogStatistics log_statistics(enable_full_log_statistics, buffer_type == "serialized");
+    LogStatistics log_statistics(GetBoolPropertyEngSvelteDefault("logd.statistics"),
+                                 buffer_type == "serialized");
 
     // Serves the purpose of managing the last logs times read on a socket connection, and as a
     // reader lock on a range of log entries.
@@ -309,9 +319,7 @@
     // and LogReader is notified to send updates to connected clients.
     LogAudit* al = nullptr;
     if (auditd) {
-        int dmesg_fd = __android_logger_property_get_bool("ro.logd.auditd.dmesg", BOOL_DEFAULT_TRUE)
-                               ? fdDmesg
-                               : -1;
+        int dmesg_fd = GetBoolProperty("ro.logd.auditd.dmesg", true) ? fdDmesg : -1;
         al = new LogAudit(log_buffer, dmesg_fd, &log_statistics);
     }
 
diff --git a/property_service/libpropertyinfoserializer/property_info_serializer_test.cpp b/property_service/libpropertyinfoserializer/property_info_serializer_test.cpp
index a643062..3907413 100644
--- a/property_service/libpropertyinfoserializer/property_info_serializer_test.cpp
+++ b/property_service/libpropertyinfoserializer/property_info_serializer_test.cpp
@@ -139,7 +139,7 @@
 
   auto property_info_area = reinterpret_cast<const PropertyInfoArea*>(serialized_trie.data());
 
-  // Sanity check
+  // Smoke test
   auto root_node = property_info_area->root_node();
   EXPECT_STREQ("root", root_node.name());
   EXPECT_STREQ("default", property_info_area->context(root_node.context_index()));
diff --git a/qemu_pipe/qemu_pipe.cpp b/qemu_pipe/qemu_pipe.cpp
index beeccb0..03afb21 100644
--- a/qemu_pipe/qemu_pipe.cpp
+++ b/qemu_pipe/qemu_pipe.cpp
@@ -35,7 +35,6 @@
 #endif
 
 int qemu_pipe_open(const char* pipeName) {
-    // Sanity check.
     if (!pipeName) {
         errno = EINVAL;
         return -1;
diff --git a/rootdir/Android.mk b/rootdir/Android.mk
index ac8e847..77fa94e 100644
--- a/rootdir/Android.mk
+++ b/rootdir/Android.mk
@@ -131,6 +131,16 @@
 # via /vendor/lib/modules directly.
 LOCAL_POST_INSTALL_CMD += ; ln -sf /vendor/vendor_dlkm/etc $(TARGET_ROOT_OUT)/vendor_dlkm/etc
 
+# For /odm_dlkm partition.
+LOCAL_POST_INSTALL_CMD += ; mkdir -p $(TARGET_ROOT_OUT)/odm_dlkm
+# For Treble Generic System Image (GSI), system-as-root GSI needs to work on
+# both devices with and without /odm_dlkm partition. Those symlinks are for
+# devices without /odm_dlkm partition. For devices with /odm_dlkm
+# partition, mount odm_dlkm.img under /odm_dlkm will hide those symlinks.
+# Note that /odm_dlkm/lib is omitted because odm DLKMs should be accessed
+# via /odm/lib/modules directly.
+LOCAL_POST_INSTALL_CMD += ; ln -sf /odm/odm_dlkm/etc $(TARGET_ROOT_OUT)/odm_dlkm/etc
+
 ifdef BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE
   LOCAL_POST_INSTALL_CMD += ; mkdir -p $(TARGET_ROOT_OUT)/cache
 else
diff --git a/rootdir/init.rc b/rootdir/init.rc
index fb6f1be..6ef3bdc 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -81,6 +81,11 @@
     # Mount tracefs
     mount tracefs tracefs /sys/kernel/tracing
 
+    # create sys dirctory
+    mkdir /dev/sys 0755 system system
+    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
@@ -867,17 +872,26 @@
     chown root system /sys/block/zram0/writeback
     chmod 0664 /sys/block/zram0/writeback
 
+    # to access F2FS sysfs on dm-<num> directly
+    mkdir /dev/sys/fs/by-name 0755 system system
+    symlink /sys/fs/f2fs/${dev.mnt.blk.data} /dev/sys/fs/by-name/userdata
+
+    # to access dm-<num> sysfs
+    mkdir /dev/sys/block/by-name 0755 system system
+    symlink /sys/devices/virtual/block/${dev.mnt.blk.data} /dev/sys/block/by-name/userdata
+
     # F2FS tuning. Set cp_interval larger than dirty_expire_centisecs, 30 secs,
     # to avoid power consumption when system becomes mostly idle. Be careful
     # to make it too large, since it may bring userdata loss, if they
     # are not aware of using fsync()/sync() to prepare sudden power-cut.
-    write /sys/fs/f2fs/${dev.mnt.blk.data}/cp_interval 200
-    write /sys/fs/f2fs/${dev.mnt.blk.data}/gc_urgent_sleep_time 50
+    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_enable 1
 
     # limit discard size to 128MB in order to avoid long IO latency
     # for filesystem tuning first (dm or sda)
     # Note that, if dm-<num> is used, sda/mmcblk0 should be tuned in vendor/init.rc
-    write /sys/devices/virtual/block/${dev.mnt.blk.data}/queue/discard_max_bytes 134217728
+    write /dev/sys/block/by-name/userdata/queue/discard_max_bytes 134217728
 
     # Permissions for System Server and daemons.
     chown system system /sys/power/autosleep
diff --git a/shell_and_utilities/README.md b/shell_and_utilities/README.md
index 3bee875..4510dc7 100644
--- a/shell_and_utilities/README.md
+++ b/shell_and_utilities/README.md
@@ -98,7 +98,7 @@
 toolbox: df getevent iftop ioctl ionice log ls lsof mount nandread
 newfs\_msdos ps prlimit renice sendevent start stop top uptime watchprops
 
-toybox: acpi basename blockdev bzcat cal cat chcon chgrp chmod chown
+toybox (0.5.2-ish): acpi basename blockdev bzcat cal cat chcon chgrp chmod chown
 chroot cksum clear comm cmp cp cpio cut date dirname dmesg dos2unix echo
 env expand expr fallocate false find free getenforce getprop groups
 head hostname hwclock id ifconfig inotifyd insmod kill load\_policy ln
@@ -118,7 +118,7 @@
 toolbox: getevent iftop ioctl log nandread newfs\_msdos ps prlimit
 sendevent start stop top
 
-toybox: acpi base64 basename blockdev bzcat cal cat chcon chgrp chmod
+toybox (0.7.0-ish): acpi base64 basename blockdev bzcat cal cat chcon chgrp chmod
 chown chroot cksum clear comm cmp cp cpio cut date df dirname dmesg
 dos2unix du echo env expand expr fallocate false find flock free
 getenforce getprop groups head hostname hwclock id ifconfig inotifyd
@@ -140,7 +140,7 @@
 
 toolbox: getevent newfs\_msdos
 
-toybox: acpi base64 basename blockdev cal cat chcon chgrp chmod chown
+toybox (0.7.3-ish): acpi base64 basename blockdev cal cat chcon chgrp chmod chown
 chroot chrt cksum clear cmp comm cp cpio cut date df diff dirname dmesg
 dos2unix du echo env expand expr fallocate false file find flock free
 getenforce getprop groups gunzip gzip head hostname hwclock id ifconfig
@@ -166,7 +166,7 @@
 
 toolbox: getevent getprop newfs\_msdos
 
-toybox: acpi base64 basename blockdev cal cat chcon chgrp chmod chown
+toybox (0.7.6-ish): acpi base64 basename blockdev cal cat chcon chgrp chmod chown
 chroot chrt cksum clear cmp comm cp cpio cut date df diff dirname dmesg
 dos2unix du echo env expand expr fallocate false file find flock fmt free
 getenforce groups gunzip gzip head hostname hwclock id ifconfig inotifyd
@@ -192,7 +192,7 @@
 
 toolbox: getevent getprop
 
-toybox: acpi base64 basename bc blkid blockdev cal cat chattr chcon chgrp
+toybox (0.8.0-ish): acpi base64 basename bc blkid blockdev cal cat chattr chcon chgrp
 chmod chown chroot chrt cksum clear cmp comm cp cpio cut date dd df
 diff dirname dmesg dos2unix du echo egrep env expand expr fallocate
 false fgrep file find flock fmt free freeramdisk fsfreeze getconf
@@ -224,7 +224,7 @@
 
 toolbox: getevent getprop setprop start stop
 
-toybox: acpi base64 basename blkid blockdev cal cat chattr chcon chgrp chmod
+toybox (0.8.3-ish): acpi base64 basename blkid blockdev cal cat chattr chcon chgrp chmod
 chown chroot chrt cksum clear cmp comm cp cpio cut date dd devmem
 df diff dirname dmesg dos2unix du echo egrep env expand expr fallocate
 false fgrep file find flock fmt free freeramdisk fsfreeze fsync getconf
diff --git a/trusty/confirmationui/NotSoSecureInput.cpp b/trusty/confirmationui/NotSoSecureInput.cpp
index 3d9a2d6..18e45cd 100644
--- a/trusty/confirmationui/NotSoSecureInput.cpp
+++ b/trusty/confirmationui/NotSoSecureInput.cpp
@@ -82,7 +82,7 @@
 
 /**
  * This is an implementation of the SecureInput protocol in unserspace. This is
- * just an example and should not be used as is. The protocol implemented her
+ * just an example and should not be used as is. The protocol implemented here
  * should be used by a trusted input device that can assert user events with
  * high assurance even if the HLOS kernel is compromised. A confirmationui HAL
  * that links directly against this implementation is not secure and shal not be
diff --git a/trusty/gatekeeper/trusty_gatekeeper.cpp b/trusty/gatekeeper/trusty_gatekeeper.cpp
index d149664..e416fb2 100644
--- a/trusty/gatekeeper/trusty_gatekeeper.cpp
+++ b/trusty/gatekeeper/trusty_gatekeeper.cpp
@@ -56,9 +56,9 @@
 
 SizedBuffer hidl_vec2sized_buffer(const hidl_vec<uint8_t>& vec) {
     if (vec.size() == 0 || vec.size() > std::numeric_limits<uint32_t>::max()) return {};
-    auto dummy = new uint8_t[vec.size()];
-    std::copy(vec.begin(), vec.end(), dummy);
-    return {dummy, static_cast<uint32_t>(vec.size())};
+    auto buffer = new uint8_t[vec.size()];
+    std::copy(vec.begin(), vec.end(), buffer);
+    return {buffer, static_cast<uint32_t>(vec.size())};
 }
 
 Return<void> TrustyGateKeeperDevice::enroll(uint32_t uid,
diff --git a/trusty/keymaster/TrustyKeymaster.cpp b/trusty/keymaster/TrustyKeymaster.cpp
index f3ef747..750a9d7 100644
--- a/trusty/keymaster/TrustyKeymaster.cpp
+++ b/trusty/keymaster/TrustyKeymaster.cpp
@@ -173,7 +173,7 @@
 }
 
 GetHmacSharingParametersResponse TrustyKeymaster::GetHmacSharingParameters() {
-    // Dummy empty buffer to allow ForwardCommand to have something to serialize
+    // Empty buffer to allow ForwardCommand to have something to serialize
     Buffer request;
     GetHmacSharingParametersResponse response;
     ForwardCommand(KM_GET_HMAC_SHARING_PARAMETERS, request, &response);
diff --git a/trusty/libtrusty/include/trusty/ipc.h b/trusty/libtrusty/include/trusty/ipc.h
new file mode 100644
index 0000000..1fa6fe4
--- /dev/null
+++ b/trusty/libtrusty/include/trusty/ipc.h
@@ -0,0 +1,77 @@
+/*
+ * 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.
+ */
+
+#ifndef _UAPI_LINUX_TRUSTY_IPC_H_
+#define _UAPI_LINUX_TRUSTY_IPC_H_
+
+#include <linux/ioctl.h>
+#include <linux/types.h>
+#include <linux/uio.h>
+
+/**
+ * enum transfer_kind - How to send an fd to Trusty
+ * @TRUSTY_SHARE: Memory will be accessible by Linux and Trusty. On ARM it will
+ *                be mapped as nonsecure. Suitable for shared memory. The paired
+ *                fd must be a "memfd".
+ * @TRUSTY_LEND:  Memory will be accessible only to Trusty. On ARM it will be
+ *                transitioned to "Secure" memory if Trusty is in TrustZone.
+ *                This transfer kind is suitable for donating video buffers or
+ *                other similar resources. The paired fd may need to come from a
+ *                platform-specific allocator for memory that may be
+ *                transitioned to "Secure".
+ *
+ * Describes how the user would like the resource in question to be sent to
+ * Trusty. Options may be valid only for certain kinds of fds.
+ */
+enum transfer_kind {
+    TRUSTY_SHARE = 0,
+    TRUSTY_LEND = 1,
+};
+
+/**
+ * struct trusty_shm - Describes a transfer of memory to Trusty
+ * @fd:       The fd to transfer
+ * @transfer: How to transfer it - see &enum transfer_kind
+ */
+struct trusty_shm {
+    __s32 fd;
+    __u32 transfer;
+};
+
+/**
+ * struct tipc_send_msg_req - Request struct for @TIPC_IOC_SEND_MSG
+ * @iov:     Pointer to an array of &struct iovec describing data to be sent
+ * @shm:     Pointer to an array of &struct trusty_shm describing any file
+ *           descriptors to be transferred.
+ * @iov_cnt: Number of elements in the @iov array
+ * @shm_cnt: Number of elements in the @shm array
+ */
+struct tipc_send_msg_req {
+    __u64 iov;
+    __u64 shm;
+    __u64 iov_cnt;
+    __u64 shm_cnt;
+};
+
+#define TIPC_IOC_MAGIC 'r'
+#define TIPC_IOC_CONNECT _IOW(TIPC_IOC_MAGIC, 0x80, char*)
+#define TIPC_IOC_SEND_MSG _IOW(TIPC_IOC_MAGIC, 0x81, struct tipc_send_msg_req)
+
+#if defined(CONFIG_COMPAT)
+#define TIPC_IOC_CONNECT_COMPAT _IOW(TIPC_IOC_MAGIC, 0x80, compat_uptr_t)
+#endif
+
+#endif
diff --git a/trusty/libtrusty/include/trusty/tipc.h b/trusty/libtrusty/include/trusty/tipc.h
index a3f2a3f..b44afd3 100644
--- a/trusty/libtrusty/include/trusty/tipc.h
+++ b/trusty/libtrusty/include/trusty/tipc.h
@@ -21,7 +21,11 @@
 extern "C" {
 #endif
 
+#include <sys/uio.h>
+#include <trusty/ipc.h>
+
 int tipc_connect(const char *dev_name, const char *srv_name);
+ssize_t tipc_send(int fd, const struct iovec* iov, int iovcnt, struct trusty_shm* shm, int shmcnt);
 int tipc_close(int fd);
 
 #ifdef __cplusplus
diff --git a/trusty/libtrusty/tipc-test/tipc_test.c b/trusty/libtrusty/tipc-test/tipc_test.c
index d20d4ee..ca581dc 100644
--- a/trusty/libtrusty/tipc-test/tipc_test.c
+++ b/trusty/libtrusty/tipc-test/tipc_test.c
@@ -21,6 +21,8 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <getopt.h>
+#define __USE_GNU
+#include <sys/mman.h>
 #include <sys/uio.h>
 
 #include <trusty/tipc.h>
@@ -39,6 +41,7 @@
 static const char *closer2_name = "com.android.ipc-unittest.srv.closer2";
 static const char *closer3_name = "com.android.ipc-unittest.srv.closer3";
 static const char *main_ctrl_name = "com.android.ipc-unittest.ctrl";
+static const char* receiver_name = "com.android.trusty.memref.receiver";
 
 static const char *_sopts = "hsvD:t:r:m:b:";
 static const struct option _lopts[] =  {
@@ -66,25 +69,25 @@
 "\n"
 ;
 
-static const char *usage_long =
-"\n"
-"The following tests are available:\n"
-"   connect      - connect to datasink service\n"
-"   connect_foo  - connect to non existing service\n"
-"   burst_write  - send messages to datasink service\n"
-"   echo         - send/receive messages to echo service\n"
-"   select       - test select call\n"
-"   blocked_read - test blocked read\n"
-"   closer1      - connection closed by remote (test1)\n"
-"   closer2      - connection closed by remote (test2)\n"
-"   closer3      - connection closed by remote (test3)\n"
-"   ta2ta-ipc    - execute TA to TA unittest\n"
-"   dev-uuid     - print device uuid\n"
-"   ta-access    - test ta-access flags\n"
-"   writev       - writev test\n"
-"   readv        - readv test\n"
-"\n"
-;
+static const char* usage_long =
+        "\n"
+        "The following tests are available:\n"
+        "   connect      - connect to datasink service\n"
+        "   connect_foo  - connect to non existing service\n"
+        "   burst_write  - send messages to datasink service\n"
+        "   echo         - send/receive messages to echo service\n"
+        "   select       - test select call\n"
+        "   blocked_read - test blocked read\n"
+        "   closer1      - connection closed by remote (test1)\n"
+        "   closer2      - connection closed by remote (test2)\n"
+        "   closer3      - connection closed by remote (test3)\n"
+        "   ta2ta-ipc    - execute TA to TA unittest\n"
+        "   dev-uuid     - print device uuid\n"
+        "   ta-access    - test ta-access flags\n"
+        "   writev       - writev test\n"
+        "   readv        - readv test\n"
+        "   send-fd      - transmit memfd to trusty, use as shm\n"
+        "\n";
 
 static uint opt_repeat  = 1;
 static uint opt_msgsize = 32;
@@ -885,6 +888,66 @@
 	return 0;
 }
 
+static int send_fd_test(void) {
+    int ret;
+    int memfd = -1;
+    int fd = -1;
+    volatile char* buf = MAP_FAILED;
+
+    fd = tipc_connect(dev_name, receiver_name);
+    if (fd < 0) {
+        fprintf(stderr, "Failed to connect to test support TA - is it missing?\n");
+        ret = -1;
+        goto cleanup;
+    }
+
+    memfd = memfd_create("tipc-send-fd", 0);
+    if (memfd < 0) {
+        fprintf(stderr, "Failed to create memfd: %s\n", strerror(errno));
+        ret = -1;
+        goto cleanup;
+    }
+
+    if (ftruncate(memfd, PAGE_SIZE) < 0) {
+        fprintf(stderr, "Failed to resize memfd: %s\n", strerror(errno));
+        ret = -1;
+        goto cleanup;
+    }
+
+    buf = mmap(0, PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, memfd, 0);
+    if (buf == MAP_FAILED) {
+        fprintf(stderr, "Failed to map memfd: %s\n", strerror(errno));
+        ret = -1;
+        goto cleanup;
+    }
+
+    strcpy((char*)buf, "From NS");
+
+    struct trusty_shm shm = {
+            .fd = memfd,
+            .transfer = TRUSTY_SHARE,
+    };
+
+    ssize_t rc = tipc_send(fd, NULL, 0, &shm, 1);
+    if (rc < 0) {
+        fprintf(stderr, "tipc_send failed\n");
+        ret = rc;
+        goto cleanup;
+    }
+    char c;
+    read(fd, &c, 1);
+    tipc_close(fd);
+
+    ret = strcmp("Hello from Trusty!", (const char*)buf) ? (-1) : 0;
+
+cleanup:
+    if (buf != MAP_FAILED) {
+        munmap((char*)buf, PAGE_SIZE);
+    }
+    close(memfd);
+    tipc_close(fd);
+    return ret;
+}
 
 int main(int argc, char **argv)
 {
@@ -933,10 +996,12 @@
 		rc = writev_test(opt_repeat, opt_msgsize, opt_variable);
 	} else if (strcmp(test_name, "readv") == 0) {
 		rc = readv_test(opt_repeat, opt_msgsize, opt_variable);
-	} else {
-		fprintf(stderr, "Unrecognized test name '%s'\n", test_name);
-		print_usage_and_exit(argv[0], EXIT_FAILURE, true);
-	}
+    } else if (strcmp(test_name, "send-fd") == 0) {
+        rc = send_fd_test();
+    } else {
+        fprintf(stderr, "Unrecognized test name '%s'\n", test_name);
+        print_usage_and_exit(argv[0], EXIT_FAILURE, true);
+    }
 
-	return rc == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
+    return rc == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
 }
diff --git a/trusty/libtrusty/trusty.c b/trusty/libtrusty/trusty.c
index a6238af..ad4d8cd 100644
--- a/trusty/libtrusty/trusty.c
+++ b/trusty/libtrusty/trusty.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2015 The Android Open Source Project
+ * 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.
@@ -27,7 +27,7 @@
 
 #include <log/log.h>
 
-#include "tipc_ioctl.h"
+#include <trusty/ipc.h>
 
 int tipc_connect(const char *dev_name, const char *srv_name)
 {
@@ -55,6 +55,22 @@
 	return fd;
 }
 
+ssize_t tipc_send(int fd, const struct iovec* iov, int iovcnt, struct trusty_shm* shms,
+                  int shmcnt) {
+    struct tipc_send_msg_req req;
+    req.iov = (__u64)iov;
+    req.iov_cnt = (__u64)iovcnt;
+    req.shm = (__u64)shms;
+    req.shm_cnt = (__u64)shmcnt;
+
+    int rc = ioctl(fd, TIPC_IOC_SEND_MSG, &req);
+    if (rc < 0) {
+        ALOGE("%s: failed to send message (err=%d)\n", __func__, rc);
+    }
+
+    return rc;
+}
+
 void tipc_close(int fd)
 {
 	close(fd);
diff --git a/trusty/trusty-test.mk b/trusty/trusty-test.mk
new file mode 100644
index 0000000..fd353d1
--- /dev/null
+++ b/trusty/trusty-test.mk
@@ -0,0 +1,16 @@
+# 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.
+
+PRODUCT_PACKAGES += \
+	spiproxyd \
diff --git a/trusty/utils/spiproxyd/Android.bp b/trusty/utils/spiproxyd/Android.bp
new file mode 100644
index 0000000..c1d0987
--- /dev/null
+++ b/trusty/utils/spiproxyd/Android.bp
@@ -0,0 +1,36 @@
+// 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.
+
+cc_binary {
+    name: "spiproxyd",
+    vendor: true,
+
+    srcs: [
+        "main.c",
+    ],
+
+    shared_libs: [
+        "liblog",
+        "libtrusty",
+    ],
+
+    init_rc: [
+        "proxy.rc",
+    ],
+
+    cflags: [
+        "-Wall",
+        "-Werror",
+    ],
+}
diff --git a/trusty/utils/spiproxyd/main.c b/trusty/utils/spiproxyd/main.c
new file mode 100644
index 0000000..c10866b
--- /dev/null
+++ b/trusty/utils/spiproxyd/main.c
@@ -0,0 +1,136 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "spiproxyd"
+
+#include <assert.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <log/log.h>
+#include <stdlib.h>
+#include <string.h>
+#include <trusty/tipc.h>
+#include <unistd.h>
+
+int handle_msg(int trusty_dev_fd, int spi_dev_fd) {
+    int rc;
+    uint8_t msg_buf[4096];
+    size_t msg_len;
+
+    /* read request from SPI Trusty app */
+    rc = read(trusty_dev_fd, &msg_buf, sizeof(msg_buf));
+    if (rc < 0) {
+        ALOGE("failed (%d) to read request from TA\n", rc);
+        return rc;
+    }
+    msg_len = rc;
+
+    /* forward request to SPI host device */
+    rc = write(spi_dev_fd, &msg_buf, msg_len);
+    if (rc < 0 || (size_t)rc != msg_len) {
+        ALOGE("failed (%d) to forward request to host\n", rc);
+        return rc < 0 ? rc : -1;
+    }
+
+    /* read response from SPI host device */
+    rc = read(spi_dev_fd, &msg_buf, sizeof(msg_buf));
+    if (rc < 0) {
+        ALOGE("failed (%d) to read response from host\n", rc);
+        return rc;
+    }
+    msg_len = rc;
+
+    /* forward response to SPI Trusty app */
+    rc = write(trusty_dev_fd, &msg_buf, msg_len);
+    if (rc < 0 || (size_t)rc != msg_len) {
+        ALOGE("failed (%d) to forward response to TA\n", rc);
+        return rc < 0 ? rc : -1;
+    }
+
+    return 0;
+}
+
+int event_loop(int trusty_dev_fd, int spi_dev_fd) {
+    while (true) {
+        int rc = handle_msg(trusty_dev_fd, spi_dev_fd);
+        if (rc < 0) {
+            ALOGE("exiting event loop\n");
+            return EXIT_FAILURE;
+        }
+    }
+}
+
+static void show_usage() {
+    ALOGE("usage: spiproxyd -t TRUSTY_DEVICE -s SPI_DEVICE -p SPI_PROXY_PORT\n");
+}
+
+static void parse_args(int argc, char* argv[], const char** trusty_dev_name,
+                       const char** spi_dev_name, const char** spi_proxy_port) {
+    int opt;
+    while ((opt = getopt(argc, argv, "ht:s:p:")) != -1) {
+        switch (opt) {
+            case 'h':
+                show_usage();
+                exit(EXIT_SUCCESS);
+                break;
+            case 't':
+                *trusty_dev_name = strdup(optarg);
+                break;
+            case 's':
+                *spi_dev_name = strdup(optarg);
+                break;
+            case 'p':
+                *spi_proxy_port = strdup(optarg);
+                break;
+            default:
+                show_usage();
+                exit(EXIT_FAILURE);
+                break;
+        }
+    }
+
+    if (!*trusty_dev_name || !*spi_dev_name || !*spi_proxy_port) {
+        show_usage();
+        exit(EXIT_FAILURE);
+    }
+}
+
+int main(int argc, char* argv[]) {
+    int rc;
+    const char* trusty_dev_name = NULL;
+    const char* spi_dev_name = NULL;
+    const char* spi_proxy_port = NULL;
+    int trusty_dev_fd;
+    int spi_dev_fd;
+
+    parse_args(argc, argv, &trusty_dev_name, &spi_dev_name, &spi_proxy_port);
+
+    rc = tipc_connect(trusty_dev_name, spi_proxy_port);
+    if (rc < 0) {
+        ALOGE("failed (%d) to connect to SPI proxy port\n", rc);
+        return rc;
+    }
+    trusty_dev_fd = rc;
+
+    rc = open(spi_dev_name, O_RDWR, 0);
+    if (rc < 0) {
+        ALOGE("failed (%d) to open SPI device\n", rc);
+        return rc;
+    }
+    spi_dev_fd = rc;
+
+    return event_loop(trusty_dev_fd, spi_dev_fd);
+}
diff --git a/trusty/utils/spiproxyd/proxy.rc b/trusty/utils/spiproxyd/proxy.rc
new file mode 100644
index 0000000..7d63e6a
--- /dev/null
+++ b/trusty/utils/spiproxyd/proxy.rc
@@ -0,0 +1,20 @@
+# 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.
+
+service spiproxyd /vendor/bin/spiproxyd -t /dev/trusty-ipc-dev0 \
+        -s /dev/vport3p2 -p com.android.trusty.spi.proxy
+    class main
+    user system
+    group system
+    oneshot