问题描述：
binder thread 和 ActivityManager之间发⽣死锁
Traces:
“ActivityManager” prio=5 tid=12 Blocked
…
黑碟
at ActivityManagerService.updateCpuStatsNow(ActivityManagerService.java:3107)
waiting to lock <0x0037ca7c> (aandroid.util.SparseArray) held by thread 135密钥索引
locked <0x0dfe4378> (a com.android.internal.os.ProcessCpuTracker)
locked <0x064e7a29> (a com.android.internal.os.BatteryStatsImpl)
at AppErrors.appNotResponding(AppErrors.java:983)
at ActivityManagerService$17.run(ActivityManagerService.java:13416)
at android.os.Handler.handleCallback(Handler.java:793)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:173)
at android.os.HandlerThread.run(HandlerThread.java:65)
at com.android.server.ServiceThread.run(ServiceThread.java:46)
“Binder:1328_15” prio=5 tid=135 Blocked
…
Event(BatteryStatsService.java:422)
waiting to lock <0x064e7a29> (acom.android.internal.os.BatteryStatsImpl) held by thread 12
at ActivityManagerService.updateProcessForegroundLocked(ActivityManagerService.java:23108)
at ActivityManagerService.importanceTokenDied(ActivityManagerService.java:8177)
locked <0x0ef100c6> (a ActivityManagerService)
locked <0x0037ca7c> (a android.util.SparseArray)
at ActivityManagerService$13.binderDied(ActivityManagerService.java:8209)
at android.os.BinderProxy.sendDeathNotice(Binder.java:842)
对于ActivityManager，查看trace 发现 “ waiting to lock <0x0037ca7c> (aandroid.util.SparseArray) held by thread 135 ”， 到 thread 135： “Binder:1328_15” prio=5 tid=135 Blocked
发现这个Binder线程也 waiting to lock <0x064e7a29> 并且 held by thread 12
⽽ thread 12正是“ “ActivityManager” prio=5 tid=12”。
由此确认为死锁问题
waiting to lock <0x064e7a29> (acom.android.internal.os.BatteryStatsImpl) held by thread 12
at ActivityManagerService.updateProcessForegroundLocked(ActivityManagerService.java:23108)
at ActivityManagerService.importanceTokenDied(ActivityManagerService.java:8177)
解决：
services/core/java/com/android/server/am/ActivityManagerService.java
void importanceTokenDied(ImportanceToken token) {
+ ProcessRecord pr = null;
电机智能
监控器synchronized (ActivityManagerService.this) {synchronized (mPidsSelfLocked) {
ImportanceToken cur
= (token.pid);
if (cur != token) {
return;
}
- ProcessRecord pr = (token.pid);
+ pr = (token.pid);
if (pr == null) {
return;
}
pr.forcingToImportant = null;
- updateProcessForegroundLocked(pr, false, false);
}
+ updateProcessForegroundLocked(pr, false, false);
updateOomAdjLocked();
}
另外⼀个例⼦：
⼿机U启动后mount externel srotage 可能引起dead lock
trace stack:
“Binder_6” prio=5 tid=57 Blocked
| group=“main” sCount=1 dsCount=0 obj=0x12fa7fa0 self=0x7f9674d000
| sysTid=3218 nice=0 cgrp=default sched=0/0 handle=0x7f941a3440
| state=S schedstat=( 450091692 353243785 1757 ) utm=30 stm=15 core=8 HZ=100
车载制氧机| stack=0x7f940a7000-0x7f940a9000 stackSize=1013KB
| held mutexes=
at com.android.VolumeList(MountService.java:3014)
waiting to lock <0x064315bf> (a java.lang.Object) held by thread 14 B
at android.os.VolumeList(StorageManager.java:918)
at android.os.StorageVolume(StorageManager.java:853)
at android.os.Environment.isExternalStorageEmulated(Environment.java:742)
at android.os.Environment.isExternalStorageEmulated(Environment.java:730)
at com.android.server.pm.PackageManagerService.isExternalMediaAvailable(PackageManagerService.java:10378) at com.android.server.PackageToClean(PackageManagerService.java:10385) locked <0x05b654c7> (a android.util.ArrayMap) A
t.pm.Transact(IPackageManager.java:1636)
at com.android.server.Transact(PackageManagerService.java:2937)
at android.Transact(Binder.java:458)
“android.fg” prio=5 tid=14 Blocked
| group=“main” sCount=1 dsCount=0 obj=0x12da1f90 self=0x7fa9ad8800
| sysTid=1792 nice=0 cgrp=default sched=0/0 handle=0x7f9867f440
| state=S schedstat=( 79482537 29476078 684 ) utm=4 stm=4 core=5 HZ=100
pvc面膜| stack=0x7f9857d000-0x7f9857f000 stackSize=1037KB
| held mutexes=
at com.android.server.am.ActivityManagerService.broadcastIntent(ActivityManagerService.java:19159)
waiting to lock <0x074b3319> (a com.android.server.am.ActivityManagerService) held by thread 98 C
at android.app.ContextImpl.sendBroadcastAsUser(ContextImpl.java:942)
at com.android.VolumeStateChangedLocked(MountService.java:1424)
at com.android.EventLocked(MountService.java:1134)
at com.android.Event(MountService.java:1039)
locked <0x064315bf> (a java.lang.Object) B
at com.android.server.NativeDaemonConnector.handleMessage(NativeDaemonConnector.java:135)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:207)
at android.os.HandlerThread.run(HandlerThread.java:61)
at com.android.server.ServiceThread.run(ServiceThread.java:46)
“Binder_F” prio=5 tid=98 Blocked
电渣重熔| group=“main” sCount=1 dsCount=0 obj=0x13f740a0 self=0x7f96ab6400
| sysTid=3483 nice=0 cgrp=default sched=0/0 handle=0x7f8dbb7440
| state=S schedstat=( 472520780 311910624 1572 ) utm=35 stm=12 core=6 HZ=100
| stack=0x7f8dabb000-0x7f8dabd000 stackSize=1013KB
| held mutexes=
at com.android.server.pm.PackageManagerService.queryContentProviders(PackageManagerService.java:5974)
waiting to lock <0x05b654c7> (a android.util.ArrayMap) held by thread 57 A
at
com.android.server.ateApplicationProvidersLocked(ActivityManagerService.java:1078 6)
at com.android.server.am.ActivityManagerService.attachApplicationLocked(ActivityManagerService.j
ava:7405)
at com.android.server.am.ActivityManagerService.attachApplication(ActivityManagerService.java:7577)
locked <0x074b3319> (a com.android.server.am.ActivityManagerService) C
at android.Transact(ActivityManagerNative.java:513)
at com.android.server.Transact(ActivityManagerService.java:2764)
at android.Transact(Binder.java:458)
services/core/java/com/android/server/pm/PackageManagerService.java修改
@Override
public PackageCleanItem nextPackageToClean(PackageCleanItem lastPackage) {
if (CallingUid()) != null) {
return null;
}
// writer
- synchronized (mPackages) {
if (!isExternalMediaAvailable()) {
// If the external storage is no longer mounted at this point,
// the caller may not have been able to delete all of this
// packages files and can not delete any more. Bail.
return null;
}
+ synchronized (mPackages) {
final ArrayList<PackageCleanItem> pkgs = mSettings.mPackagesToBeCleaned;
if (lastPackage != null) {
}
if (pkgs.size() > 0) {
(0);
}
}
return null;
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