Figure

Hi
在不使用小窗模式打开音乐软件，不会有这个问题
请帮忙调查，谢谢

分析:
10-12 02:58:23.356 1125 1666 E Watchdog: First set of traces taken from /data/anr/anr_2022-10-12-02-57-31-337
10-12 02:58:23.396 1125 1666 E Watchdog: Second set of traces taken from /data/anr/anr_2022-10-12-02-58-10-243
10-12 02:58:23.471 1125 6570 I DropBoxManagerService: add tag=system_server_watchdog isTagEnabled=true flags=0x6
10-12 02:58:23.486 1125 1666 W Watchdog: *** WATCHDOG KILLING SYSTEM PROCESS: Blocked in handler on foreground thread (android.fg), Blocked in handler on display thread (android.display), Blocked in handler on animation thread (android.anim), Blocked in handler on PowerManagerService (PowerManagerService)
10-12 02:58:23.486 1125 1666 W Watchdog: android.fg annotated stack trace:
10-12 02:58:23.486 1125 1666 W Watchdog: at com.android.server.dreams.DreamManagerService$4.onDreamStopped(DreamManagerService.java:511)

发生死锁导致anr 期望可以提供全日志 包括dropbox anr 另外提供一下问题发生的时间点 谢谢

"Binder:8933_F" prio=5 tid=150 Blocked | group="main" sCount=1 ucsCount=0 flags=1 obj=0x13600080 self=0xb400007d13bd62f0 | sysTid=12923 nice=0 cgrp=default sched=0/0 handle=0x7ad4676cb0 | state=S schedstat=( 1868413121 1398833426 5373 ) utm=83 stm=103 core=2 HZ=100 | stack=0x7ad457f000-0x7ad4581000 stackSize=991KB | held mutexes=
at com.android.server.wm.ActivityTaskManagerService$LocalService.notifyDreamStateChanged(ActivityTaskManagerService.java:5353)
- waiting to lock <0x00627d1e> (a com.android.server.wm.WindowManagerGlobalLock) held by thread 17
at com.android.server.dreams.DreamManagerService.cleanupDreamLocked(DreamManagerService.java:466)
at com.android.server.dreams.DreamManagerService.stopDreamLocked(DreamManagerService.java:432)
at com.android.server.dreams.DreamManagerService.finishSelfInternal(DreamManagerService.java:229)
- locked <0x0adb8d59> (a java.lang.Object)
at com.android.server.dreams.DreamManagerService.access$1800(DreamManagerService.java:71)
at com.android.server.dreams.DreamManagerService$BinderService.finishSelf(DreamManagerService.java:678)
at android.service.dreams.IDreamManager$Stub.onTransact(IDreamManager.java:245)
at android.os.Binder.execTransactInternal(Binder.java:1179)
at android.os.Binder.execTransact(Binder.java:1143)

"android.anim" prio=5 tid=17 Blocked
 | group="main" sCount=1 ucsCount=0 flags=1 obj=0x14681398 self=0xb400007d13ab91b0
 | sysTid=8955 nice=-10 cgrp=default sched=0/0 handle=0x7b12d77cb0
 | state=S schedstat=( 8904928424 3440726525 21052 ) utm=420 stm=470 core=4 HZ=100
 | stack=0x7b12c74000-0x7b12c76000 stackSize=1039KB
 | held mutexes=
  at com.android.server.dreams.DreamManagerService.isDreamingInternal(DreamManagerService.java:190)
  - waiting to lock <0x0adb8d59> (a java.lang.Object) held by thread 150
  at com.android.server.dreams.DreamManagerService.access$1400(DreamManagerService.java:71)
  at com.android.server.dreams.DreamManagerService$BinderService.isDreaming(DreamManagerService.java:614)
  at android.app.DreamManager.isDreaming(DreamManager.java:114)
  at com.android.server.wm.InsetsPolicy.getStatusControlTarget(InsetsPolicy.java:350)
  at com.android.server.wm.InsetsPolicy.updateBarControlTarget(InsetsPolicy.java:141)
  at com.android.server.wm.DisplayPolicy.updateSystemUiVisibilityLw(DisplayPolicy.java:2658)
  at com.android.server.wm.DisplayPolicy.finishPostLayoutPolicyLw(DisplayPolicy.java:2047)
  at com.android.server.wm.DisplayContent.applySurfaceChangesTransaction(DisplayContent.java:4318)
  at com.android.server.wm.RootWindowContainer.applySurfaceChangesTransaction(RootWindowContainer.java:1076)
  at com.android.server.wm.RootWindowContainer.performSurfacePlacementNoTrace(RootWindowContainer.java:852)
  at com.android.server.wm.RootWindowContainer.performSurfacePlacement(RootWindowContainer.java:805)
  at com.android.server.wm.WindowSurfacePlacer.performSurfacePlacementLoop(WindowSurfacePlacer.java:177)
  at com.android.server.wm.WindowSurfacePlacer.performSurfacePlacement(WindowSurfacePlacer.java:126)
  at com.android.server.wm.WindowSurfacePlacer.performSurfacePlacement(WindowSurfacePlacer.java:115)
  at com.android.server.wm.WindowSurfacePlacer$Traverser.run(WindowSurfacePlacer.java:57)
  - locked <0x00627d1e> (a com.android.server.wm.WindowManagerGlobalLock)
  at android.os.Handler.handleCallback(Handler.java:938)
  at android.os.Handler.dispatchMessage(Handler.java:99)
  at android.os.Looper.loopOnce(Looper.java:201)
  at android.os.Looper.loop(Looper.java:288)
  at android.os.HandlerThread.run(HandlerThread.java:67)
  at com.android.server.ServiceThread.run(ServiceThread.java:44)

分析：
tid150和  tid17死锁
 tid 150
at com.android.server.dreams.DreamManagerService.finishSelfInternal 持有DreamManagerService.mlock 
at com.android.server.wm.ActivityTaskManagerService$LocalService.notifyDreamStateChanged(ActivityTaskManagerService.java:5353) 等待WindowManagerGlobalLock

tid17
at com.android.server.wm.WindowSurfacePlacer$Traverser.run(WindowSurfacePlacer.java:57) 持有WindowManagerGlobalLock
at com.android.server.dreams.DreamManagerService.isDreamingInternal(DreamManagerService.java:190) 等待DreamManagerService.mlock

由于这笔代码造成了死锁 希望相关人员看一下
https://dev.thundercomm.com/gerrit/c/general/platform/frameworks/base/+/153120

【根本原因】DreamManagerService中isDreaming方法存在lock，实际上DreamManagerService上大部分公开方法都持有这个锁，当进入Dream的时候DreamManagerService中方法调用频繁，锁竞争造成死锁anr
【解决方案】避免在进入Dream的时候调用DreamManagerService中的方法，根据日志，多窗口模式下进入Dream时，调用DreamManagerService中isDreaming方法造成死锁。改用prop的参数保存Dream状态，根据prop参数来判断Dream状态。
【提交代码】https://dev.thundercomm.com/gerrit/c/general/platform/frameworks/base/+/156458
【合入时间】10.19，需要在10.20或以后的版本中验证
【验证方法】
1、小窗模式的时候，等待屏保，进入屏保后，回到桌面。多次操作。
2、小窗模式，多次关闭，然后打开，等待屏保，进入屏保后，回到桌面。
预期效果：进入屏保，后顶部状态栏不显示，不可下拉，不会出现界面卡死

10.20测试一天没有复现，可以关闭