diff --git a/fs_mgr/fs_mgr_overlayfs_mount.cpp b/fs_mgr/fs_mgr_overlayfs_mount.cpp
index a1ec63b..bd0fcfd 100644
--- a/fs_mgr/fs_mgr_overlayfs_mount.cpp
+++ b/fs_mgr/fs_mgr_overlayfs_mount.cpp
@@ -412,6 +412,8 @@
     bool retval = true;
     bool move_dir_shared = true;
     bool parent_shared = true;
+    bool parent_have_parent = false;
+    bool parent_made_private = false;
     bool root_shared = true;
     bool root_made_private = false;
 
@@ -443,6 +445,10 @@
         if (entry.mount_point == "/") {
             root_shared = entry.shared_flag;
         }
+        // Ignore "/" as we don't overlay "/" directly.
+        if (entry.mount_point != "/") {
+            parent_have_parent |= android::base::StartsWith(mount_point, entry.mount_point + "/");
+        }
     }
 
     // Precondition is that kMoveMountTempDir is MS_PRIVATE, otherwise don't try to move any
@@ -453,11 +459,13 @@
 
     // Need to make the original mountpoint MS_PRIVATE, so that the overlayfs can be MS_MOVE.
     // This could happen if its parent mount is remounted later.
-    if (!fs_mgr_overlayfs_set_shared_mount(mount_point, false)) {
-        // If failed to set "/system" mount type, it might be due to "/system" not being a valid
-        // mountpoint after switch root. Retry with "/" in this case.
-        if (errno == EINVAL && mount_point == "/system") {
-            root_made_private = fs_mgr_overlayfs_set_shared_mount("/", false);
+    if (parent_have_parent) {
+        parent_made_private |= fs_mgr_overlayfs_set_shared_mount(mount_point, false);
+        if (!parent_made_private && errno == EINVAL && mount_point == "/system") {
+            // If failed to set "/system" mount type, it might be due to "/system" not being a valid
+            // mountpoint after switch root. Retry with "/" in this case.
+            parent_made_private |= fs_mgr_overlayfs_set_shared_mount("/", false);
+            root_made_private |= parent_made_private;
         }
     }
 
@@ -496,6 +504,15 @@
                 continue;
             }
         }
+        if (!parent_made_private) {
+            parent_made_private |= fs_mgr_overlayfs_set_shared_mount(mount_point, false);
+            if (!parent_made_private && errno == EINVAL && mount_point == "/system") {
+                // If failed to set "/system" mount type, it might be due to "/system" not being a
+                // valid mountpoint after switch root. Retry with "/" in this case.
+                parent_made_private |= fs_mgr_overlayfs_set_shared_mount("/", false);
+                root_made_private |= parent_made_private;
+            }
+        }
 
         if (new_entry.shared_flag) {
             new_entry.shared_flag = fs_mgr_overlayfs_set_shared_mount(new_entry.mount_point, false);
@@ -524,7 +541,7 @@
         rmdir(entry.dir.c_str());
     }
     // If the original (overridden) mount was MS_SHARED, then set the overlayfs mount to MS_SHARED.
-    if (parent_shared) {
+    if (parent_shared && parent_made_private) {
         fs_mgr_overlayfs_set_shared_mount(mount_point, true);
     }
     if (root_shared && root_made_private) {
diff --git a/fs_mgr/fs_mgr_remount.cpp b/fs_mgr/fs_mgr_remount.cpp
index 79c0b6d..f91d232 100644
--- a/fs_mgr/fs_mgr_remount.cpp
+++ b/fs_mgr/fs_mgr_remount.cpp
@@ -171,11 +171,12 @@
         }
         if (show_help) {
             show_help = false;
-            std::cerr << "WARNING: Userdata checkpoint is in progress. To force end checkpointing, "
-                         "call 'vdc checkpoint commitChanges'. This can lead to data corruption if "
-                         "rolled back."
+            std::cerr << "WARNING: Userdata checkpoint is in progress. "
+                         "To forcibly end checkpointing, "
+                         "call 'vdc checkpoint commitChanges'. "
+                         "This can lead to data corruption if rolled back."
                       << std::endl;
-            LOG(INFO) << "Waiting for checkpoint to complete and then continue remount.";
+            LOG(INFO) << "Waiting for checkpoint to complete before remounting...";
         }
         std::this_thread::sleep_for(4s);
     }
diff --git a/fs_mgr/libsnapshot/Android.bp b/fs_mgr/libsnapshot/Android.bp
index 39b5b76..cc6db35 100644
--- a/fs_mgr/libsnapshot/Android.bp
+++ b/fs_mgr/libsnapshot/Android.bp
@@ -316,6 +316,12 @@
     test_options: {
         // Legacy VAB launched in Android R.
         min_shipping_api_level: 30,
+        test_runner_options: [
+            {
+                name: "force-no-test-error",
+                value: "false",
+            },
+        ],
     },
 }
 
diff --git a/fs_mgr/libsnapshot/snapuserd/Android.bp b/fs_mgr/libsnapshot/snapuserd/Android.bp
index 649309d..d83524a 100644
--- a/fs_mgr/libsnapshot/snapuserd/Android.bp
+++ b/fs_mgr/libsnapshot/snapuserd/Android.bp
@@ -168,7 +168,7 @@
     vendor_ramdisk_available: true,
 }
 
-// This target will install to /system/bin/snapuserd_ramdisk 
+// This target will install to /system/bin/snapuserd_ramdisk
 // It will also create a symblink on /system/bin/snapuserd that point to
 // /system/bin/snapuserd_ramdisk .
 // This way, init can check if generic ramdisk copy exists.
@@ -249,6 +249,14 @@
     test_suites: [
         "device-tests",
     ],
+    test_options: {
+        test_runner_options: [
+            {
+                name: "force-no-test-error",
+                value: "false",
+            },
+        ],
+    },
 }
 
 // vts tests cannot be host_supported.
diff --git a/fs_mgr/libsnapshot/snapuserd/user-space-merge/merge_worker.cpp b/fs_mgr/libsnapshot/snapuserd/user-space-merge/merge_worker.cpp
index bd7eaca..e6a9a29 100644
--- a/fs_mgr/libsnapshot/snapuserd/user-space-merge/merge_worker.cpp
+++ b/fs_mgr/libsnapshot/snapuserd/user-space-merge/merge_worker.cpp
@@ -17,6 +17,8 @@
 #include <libsnapshot/cow_format.h>
 #include <pthread.h>
 
+#include <android-base/properties.h>
+
 #include "merge_worker.h"
 #include "snapuserd_core.h"
 #include "utility.h"
@@ -179,8 +181,8 @@
         bufsink_.ResetBufferOffset();
 
         if (snapuserd_->IsIOTerminated()) {
-            SNAP_LOG(ERROR)
-                    << "MergeReplaceZeroOps: MergeWorker threads terminated - shutting down merge";
+            SNAP_LOG(ERROR) << "MergeReplaceZeroOps: MergeWorker threads terminated - shutting "
+                               "down merge";
             return false;
         }
     }
@@ -577,8 +579,10 @@
         SNAP_LOG(ERROR) << "Merge terminated early...";
         return true;
     }
+    auto merge_thread_priority = android::base::GetUintProperty<uint32_t>(
+            "ro.virtual_ab.merge_thread_priority", ANDROID_PRIORITY_BACKGROUND);
 
-    if (!SetThreadPriority(ANDROID_PRIORITY_BACKGROUND)) {
+    if (!SetThreadPriority(merge_thread_priority)) {
         SNAP_PLOG(ERROR) << "Failed to set thread priority";
     }
 
diff --git a/fs_mgr/libsnapshot/snapuserd/user-space-merge/read_worker.cpp b/fs_mgr/libsnapshot/snapuserd/user-space-merge/read_worker.cpp
index d40b6d1..ef311d4 100644
--- a/fs_mgr/libsnapshot/snapuserd/user-space-merge/read_worker.cpp
+++ b/fs_mgr/libsnapshot/snapuserd/user-space-merge/read_worker.cpp
@@ -14,11 +14,14 @@
  * limitations under the License.
  */
 
+#include <android-base/properties.h>
+
 #include <libsnapshot/cow_format.h>
 #include <pthread.h>
 
 #include "read_worker.h"
 #include "snapuserd_core.h"
+#include "user-space-merge/worker.h"
 #include "utility.h"
 
 namespace android {
@@ -259,8 +262,10 @@
     SNAP_LOG(INFO) << "Processing snapshot I/O requests....";
 
     pthread_setname_np(pthread_self(), "ReadWorker");
+    auto worker_thread_priority = android::base::GetUintProperty<uint32_t>(
+            "ro.virtual_ab.worker_thread_priority", ANDROID_PRIORITY_NORMAL);
 
-    if (!SetThreadPriority(ANDROID_PRIORITY_NORMAL)) {
+    if (!SetThreadPriority(worker_thread_priority)) {
         SNAP_PLOG(ERROR) << "Failed to set thread priority";
     }
 
diff --git a/init/Android.bp b/init/Android.bp
index 57e5a68..7b7a856 100644
--- a/init/Android.bp
+++ b/init/Android.bp
@@ -162,7 +162,7 @@
         },
         release_write_appcompat_override_system_properties: {
             cflags: ["-DWRITE_APPCOMPAT_OVERRIDE_SYSTEM_PROPERTIES"],
-        }
+        },
     },
     static_libs: [
         "libavb",
@@ -663,3 +663,11 @@
     src: "extra_free_kbytes.sh",
     filename_from_src: true,
 }
+
+phony {
+    name: "init_vendor",
+    required: select(soong_config_variable("ANDROID", "BOARD_USES_RECOVERY_AS_BOOT"), {
+        true: [],
+        default: ["init_first_stage"],
+    }),
+}
diff --git a/init/Android.mk b/init/Android.mk
deleted file mode 100644
index 4b85c15..0000000
--- a/init/Android.mk
+++ /dev/null
@@ -1,16 +0,0 @@
-# Copyright 2005 The Android Open Source Project
-
-LOCAL_PATH:= $(call my-dir)
-
-include $(CLEAR_VARS)
-
-LOCAL_MODULE := init_vendor
-LOCAL_LICENSE_KINDS := SPDX-license-identifier-Apache-2.0
-LOCAL_LICENSE_CONDITIONS := notice
-LOCAL_NOTICE_FILE := $(LOCAL_PATH)/NOTICE
-ifneq ($(BOARD_USES_RECOVERY_AS_BOOT),true)
-LOCAL_REQUIRED_MODULES := \
-   init_first_stage \
-
-endif  # BOARD_USES_RECOVERY_AS_BOOT
-include $(BUILD_PHONY_PACKAGE)
diff --git a/init/apex_init_util.cpp b/init/apex_init_util.cpp
index 6d17f36..e5a7fbc 100644
--- a/init/apex_init_util.cpp
+++ b/init/apex_init_util.cpp
@@ -107,8 +107,9 @@
     }
     // APEXes can have versioned RC files. These should be filtered based on
     // SDK version.
-    auto filtered = FilterVersionedConfigs(
-            files, android::base::GetIntProperty("ro.build.version.sdk", INT_MAX));
+    int sdk = android::base::GetIntProperty("ro.build.version.sdk", INT_MAX);
+    if (sdk < 35) sdk = 35;  // aosp/main merges only into sdk=35+ (ie. __ANDROID_API_V__+)
+    auto filtered = FilterVersionedConfigs(files, sdk);
     if (filtered.empty()) {
         return {};
     }
diff --git a/libcutils/Android.bp b/libcutils/Android.bp
index e297581..39cae1b 100644
--- a/libcutils/Android.bp
+++ b/libcutils/Android.bp
@@ -47,6 +47,8 @@
     defaults: ["libcutils_defaults"],
 
     export_include_dirs: ["include"],
+    header_libs: ["libprocessgroup_headers"],
+    export_header_lib_headers: ["libprocessgroup_headers"],
     target: {
         vendor: {
             override_export_include_dirs: ["include_outside_system"],
diff --git a/libstats/expresslog/Android.bp b/libstats/expresslog/Android.bp
index 004f8b9..96ab59b 100644
--- a/libstats/expresslog/Android.bp
+++ b/libstats/expresslog/Android.bp
@@ -47,6 +47,11 @@
         "libstatssocket",
     ],
     export_include_dirs: ["include"],
+    min_sdk_version: "33",
+    apex_available: [
+        "//apex_available:platform",
+        "com.android.btservices",
+    ],
 }
 
 genrule {
@@ -75,6 +80,11 @@
     shared_libs: [
         "libstatssocket",
     ],
+    min_sdk_version: "33",
+    apex_available: [
+        "//apex_available:platform",
+        "com.android.btservices",
+    ],
 }
 
 cc_test {
diff --git a/libutils/Android.bp b/libutils/Android.bp
index 4877cae..305cbf0 100644
--- a/libutils/Android.bp
+++ b/libutils/Android.bp
@@ -33,14 +33,12 @@
         "libbase_headers",
         "libcutils_headers",
         "liblog_headers",
-        "libprocessgroup_headers",
         "libsystem_headers",
     ],
     export_header_lib_headers: [
         "libbase_headers",
         "libcutils_headers",
         "liblog_headers",
-        "libprocessgroup_headers",
         "libsystem_headers",
     ],
     export_include_dirs: ["include"],
diff --git a/libutils/CallStack_test.cpp b/libutils/CallStack_test.cpp
index 7afc2c3..bfe6b87 100644
--- a/libutils/CallStack_test.cpp
+++ b/libutils/CallStack_test.cpp
@@ -72,7 +72,8 @@
 TEST(CallStackTest, log_stack) {
     android::CallStack::logStack("callstack_test");
     auto logger_list = android_logger_list_open(android_name_to_log_id("main"),
-                                                ANDROID_LOG_NONBLOCK, 1000, getpid());
+                                                ANDROID_LOG_NONBLOCK,
+                                                10000 /* tail */, getpid());
     ASSERT_NE(nullptr, logger_list);
     std::string log;
     while (true) {
diff --git a/libutils/Threads.cpp b/libutils/Threads.cpp
index 90ea29b..0b96ab0 100644
--- a/libutils/Threads.cpp
+++ b/libutils/Threads.cpp
@@ -37,11 +37,6 @@
 #include <log/log.h>
 
 #if defined(__ANDROID__)
-#include <processgroup/processgroup.h>
-#include <processgroup/sched_policy.h>
-#endif
-
-#if defined(__ANDROID__)
 # define __android_unused
 #else
 # define __android_unused __attribute__((__unused__))