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当前项目的trace 线程阻塞的log如下
"Binder:685_1" prio=5 tid=9 Blocked
| group="main" sCount=1 dsCount=0 flags=1 obj=0x147c0428 self=0xb400007650eb5e90
| sysTid=701 nice=-10 cgrp=default sched=1073741824/0 handle=0x74cd662cc0
| state=S schedstat=( 2834995063 648543473 13785 ) utm=211 stm=71 core=0 HZ=100
| stack=0x74cd56b000-0x74cd56d000 stackSize=995KB
| held mutexes=
at com.android.server.am.ActivityManagerService.isUserAMonkey(ActivityManagerService.java:8714)
- waiting to lock <0x06aed18c> (a com.android.server.am.ActivityManagerServiceEx) held by thread 14
at android.app.ActivityManager.isUserAMonkey(ActivityManager.java:4183)
at com.android.server.wm.RemoteAnimationController.onAnimationFinished(RemoteAnimationController.java:242)
- locked <0x0a56a777> (a com.android.server.wm.WindowManagerGlobalLock)
at com.android.server.wm.RemoteAnimationController.access$200(RemoteAnimationController.java:54)
at com.android.server.wm.RemoteAnimationController$FinishedCallback.onAnimationFinished(RemoteAnimationController.java:333)
at android.view.IRemoteAnimationFinishedCallback$Stub.onTransact(IRemoteAnimationFinishedCallback.java:85)
at android.os.Binder.execTransactInternal(Binder.java:1159)
at android.os.Binder.execTransact(Binder.java:1123)
"android.display" prio=5 tid=14 Blocked
| group="main" sCount=1 dsCount=0 flags=1 obj=0x147c89d8 self=0xb400007650ec74b0
| sysTid=763 nice=-3 cgrp=default sched=0/0 handle=0x7477666cc0
| state=S schedstat=( 15759658538 1929287484 64065 ) utm=1145 stm=430 core=0 HZ=100
| stack=0x7477563000-0x7477565000 stackSize=1043KB
| held mutexes=
at com.android.server.wm.WindowProcessController.hasActivitiesOrRecentTasks(WindowProcessController.java:654)
- waiting to lock <0x0a56a777> (a com.android.server.wm.WindowManagerGlobalLock) held by thread 9
at com.android.server.am.ProcessRecord.hasActivitiesOrRecentTasks(ProcessRecord.java:832)
at com.android.server.am.ProcessList.updateLruProcessLocked(ProcessList.java:3353)
at com.android.server.am.ProcessRecord.updateProcessInfo(ProcessRecord.java:1481)
- locked <0x06aed18c> (a com.android.server.am.ActivityManagerServiceEx)
at com.android.server.wm.-$$Lambda$BEx3OWenCvYAaV5h_J2ZkZXhEcY.accept(lambda:-1)
at com.android.internal.util.function.pooled.PooledLambdaImpl.doInvoke(PooledLambdaImpl.java:307)
at com.android.internal.util.function.pooled.PooledLambdaImpl.invoke(PooledLambdaImpl.java:201)
at com.android.internal.util.function.pooled.OmniFunction.run(OmniFunction.java:97)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:223)
at android.os.HandlerThread.run(HandlerThread.java:67)
at com.android.server.ServiceThread.run(ServiceThread.java:44)
由以上信息得知
| tid | 锁 | 等锁 | | 9 | com.android.server.wm.WindowManagerGlobalLock | com.android.server.am.ActivityManagerServiceEx | | 14 | com.android.server.am.ActivityManagerServiceEx | com.android.server.wm.WindowManagerGlobalLock |
分析得知,线程9等待线程14的AMS锁，导致死锁问题
解决办法：将线程9的同步锁改为非同步锁
根据log得知该方法在同步锁的时候出现死锁com.android.server.am.ActivityManagerService.isUserAMonkey
改为非同步锁即可，展锐提供的的方法
diff --git a/services/core/java/com/android/server/wm/RemoteAnimationController.java b/services/core/java/com/android/server/wm/RemoteAnimationController.java index c682441..a5ef649 100644 --- a/services/core/java/com/android/server/wm/RemoteAnimationController.java +++ b/services/core/java/com/android/server/wm/RemoteAnimationController.java @@ -239,7 +239,7 @@ try { mPendingAnimations.remove(i); } catch (IndexOutOfBoundsException iobe) { - if (ActivityManager.isUserAMonkey()){ + if (mService.mAmInternal != null && mService.mAmInternal.isUserAMonkeyNoCheck()){ (20210806T07:09:17)
参考链接
https://blog.csdn.net/c_z_w/article/details/89021647
https://blog.csdn.net/wd229047557/article/details/108059436?utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EOPENSEARCH%7Edefault-1.control&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EOPENSEARCH%7Edefault-1.control
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