parent
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commit
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@ -0,0 +1,116 @@
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From 9ae7ba267da4f6bf098bc3dd1ea0edc6aea59894 Mon Sep 17 00:00:00 2001
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From: Peter Cai <peter@typeblog.net>
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Date: Sun, 12 Jun 2022 13:17:38 -0400
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Subject: [PATCH 5/5] ShortcutPackage: Acquire the service's lock before
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reporting usage
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When `ShortcutPackage.pushDynamicShortcut()` is called from
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`ShortcutService.pushDynamicShortcut()`, the lock
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`ShortcutService.mLock` is acquired. However, the final
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`injectPostToHandler()` call drops this lock before calling
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`awaitInAppSearch()`.
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The `awaitInAppSearch()` method assumes that it is called while being
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guarded by the `ShortcutService` lock. When called without acquiring the
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lock, it will end up acquiring `ShortcutPackage.mLock` first, then
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acquiring `ShortcutService.mLock` anyway due to various calls into
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`ShortcutService` methods. This creates an opportunity for a dead lock
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to happen, since two threads can wait on each other for releasing the
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other lock they are currently trying to acquire. On one of my
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development devices, this happens quite regularly:
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> "android.bg" prio=5 tid=22 Blocked
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> | group="main" sCount=1 ucsCount=0 flags=1 obj=0x16040c48 self=0xb40000709b1a3c00
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> | sysTid=1515 nice=10 cgrp=default sched=0/0 handle=0x70904ebcb0
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> | state=S schedstat=( 14737747935 45952650258 46431 ) utm=610 stm=862 core=0 HZ=100
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> | stack=0x70903e8000-0x70903ea000 stackSize=1039KB
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> | held mutexes=
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> at com.android.server.pm.ShortcutService.scheduleSaveInner(ShortcutService.java:1176)
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> - waiting to lock <0x0a5766e4> (a java.lang.Object) held by thread 122
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> at com.android.server.pm.ShortcutService.scheduleSaveUser(ShortcutService.java:1166)
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> at com.android.server.pm.ShortcutService.packageShortcutsChanged(ShortcutService.java:1769)
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> at com.android.server.pm.ShortcutPackage.rescanPackage(ShortcutPackage.java:1224)
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> at com.android.server.pm.ShortcutPackage.awaitInAppSearch(ShortcutPackage.java:2627)
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> - locked <0x00e8774d> (a java.lang.Object)
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> at com.android.server.pm.ShortcutPackage.awaitInAppSearch(ShortcutPackage.java:2593)
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> at com.android.server.pm.ShortcutPackage.lambda$pushDynamicShortcut$3$ShortcutPackage(ShortcutPackage.java:452)
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> at com.android.server.pm.ShortcutPackage$$ExternalSyntheticLambda3.run(unavailable:-1)
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> at android.os.Handler.handleCallback(Handler.java:938)
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> at android.os.Handler.dispatchMessage(Handler.java:99)
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> at android.os.Looper.loopOnce(Looper.java:201)
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> at android.os.Looper.loop(Looper.java:288)
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> at android.os.HandlerThread.run(HandlerThread.java:67)
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Meanwhile, in thread 122:
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> "Binder:1489_6" prio=5 tid=122 Blocked
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> | group="main" sCount=1 ucsCount=0 flags=1 obj=0x16047388 self=0xb400007074947c00
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> | sysTid=2070 nice=0 cgrp=default sched=0/0 handle=0x70218e4cb0
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> | state=S schedstat=( 10396689438 3745391103 31237 ) utm=808 stm=231 core=1 HZ=100
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> | stack=0x70217ed000-0x70217ef000 stackSize=991KB
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> | held mutexes=
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> at com.android.server.pm.ShortcutPackage.awaitInAppSearch(ShortcutPackage.java:2605)
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> - waiting to lock <0x00e8774d> (a java.lang.Object) held by thread 22
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> at com.android.server.pm.ShortcutPackage.awaitInAppSearch(ShortcutPackage.java:2593)
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> at com.android.server.pm.ShortcutPackage.forEachShortcutStopWhen(ShortcutPackage.java:2542)
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> at com.android.server.pm.ShortcutPackage.forEachShortcutStopWhen(ShortcutPackage.java:2524)
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> at com.android.server.pm.ShortcutPackage.areAllActivitiesStillEnabled(ShortcutPackage.java:1039)
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> at com.android.server.pm.ShortcutPackage.rescanPackageIfNeeded(ShortcutPackage.java:1096)
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> at com.android.server.pm.ShortcutUser.rescanPackageIfNeeded(ShortcutUser.java:338)
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> at com.android.server.pm.ShortcutUser.onCalledByPublisher(ShortcutUser.java:294)
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> at com.android.server.pm.ShortcutService.getPackageShortcutsForPublisherLocked(ShortcutService.java:1355)
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> at com.android.server.pm.ShortcutService.lambda$pushDynamicShortcut$9$ShortcutService(ShortcutService.java:2210)
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> - locked <0x0a5766e4> (a java.lang.Object)
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> at com.android.server.pm.ShortcutService$$ExternalSyntheticLambda14.run(unavailable:-1)
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> at com.android.server.pm.ShortcutService.injectPostToHandlerIfAppSearch(ShortcutService.java:1740)
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> at com.android.server.pm.ShortcutService.pushDynamicShortcut(ShortcutService.java:2200)
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> at android.content.pm.IShortcutService$Stub.onTransact(IShortcutService.java:715)
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> at android.os.Binder.execTransactInternal(Binder.java:1201)
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> at android.os.Binder.execTransact(Binder.java:1164)
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The straightforward fix here seems to be just taking the
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`ShortcutService` lock before calling `awaitInAppSearch()`. This commit
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also added a method in `ShortcutService` to facilitate this interaction.
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Test: manual
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Change-Id: I0f997a02820b1598ca2a4ec25415c03f8f87fc87
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---
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.../core/java/com/android/server/pm/ShortcutPackage.java | 2 +-
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.../core/java/com/android/server/pm/ShortcutService.java | 8 ++++++++
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2 files changed, 9 insertions(+), 1 deletion(-)
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diff --git a/services/core/java/com/android/server/pm/ShortcutPackage.java b/services/core/java/com/android/server/pm/ShortcutPackage.java
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index b4bd086af272..d4f5a237f250 100644
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--- a/services/core/java/com/android/server/pm/ShortcutPackage.java
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+++ b/services/core/java/com/android/server/pm/ShortcutPackage.java
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@@ -449,7 +449,7 @@ class ShortcutPackage extends ShortcutPackageItem {
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forceReplaceShortcutInner(newShortcut);
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if (isAppSearchEnabled()) {
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- mShortcutUser.mService.injectPostToHandler(() -> awaitInAppSearch("reportUsage",
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+ mShortcutUser.mService.injectPostToHandlerWithLock(() -> awaitInAppSearch("reportUsage",
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session -> {
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final AndroidFuture<Boolean> future = new AndroidFuture<>();
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session.reportUsage(
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diff --git a/services/core/java/com/android/server/pm/ShortcutService.java b/services/core/java/com/android/server/pm/ShortcutService.java
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index 4e9e7a026a90..c688943d2838 100644
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--- a/services/core/java/com/android/server/pm/ShortcutService.java
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+++ b/services/core/java/com/android/server/pm/ShortcutService.java
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@@ -1731,6 +1731,14 @@ public class ShortcutService extends IShortcutService.Stub {
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mHandler.post(r);
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}
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+ void injectPostToHandlerWithLock(Runnable r) {
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+ injectPostToHandler(() -> {
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+ synchronized (mLock) {
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+ r.run();
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+ }
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+ });
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+ }
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+
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void injectRunOnNewThread(Runnable r) {
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new Thread(r).start();
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}
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--
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2.36.1
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Loading…
Reference in new issue