ANR of app caused by native mediaserver.docx
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ANRofappcausedbynativemediaserver
ANRofappcausedbynativemediaserver
本文记述了由mediaserver引起的其它应用ANR的分析方法.因为android的pthread_mutex使用BITS_NORMAL类型futex实现,不能从futex本身和内核对象知道当前哪个进程拥有锁,所以针对mediaserver这种native应用,只能从线程组内各线程的调用栈来分析锁拥有线程链.
ForandroidJellyBeanrelease.
FromAndroidsystemlog
WARN[3078.755804]（564:
631）BroadcastQueueTimeoutofbroadcastBroadcastRecord{438e0100com.android.server.WifiManager.action.START_SCAN}-receiver=android.app.LoadedApk$ReceiverDispatcher$InnerReceiver@429a7950,started60002msago
PROBABLECAUSEOFPROBLEM:
Timeout
Receiver:
android.app.LoadedApk$ReceiverDispatcher$InnerReceiver
....GeneratingDalvikbacktraces.Thismighttakesometime....
Receiver:
mightbepid630
Pid630（ServerThread）couldbeinterestingtoinvestigated
*****Dalvikstackforpid630*****
#0android.media.AudioService.handleDeviceConnection（AudioService.java:
3523）
#1android.media.AudioService.access$7100（AudioService.java:
110）
#2android.media.AudioService$AudioServiceBroadcastReceiver.onReceive（AudioService.java:
3725）
#3android.app.LoadedApk$ReceiverDispatcher$Args.run（LoadedApk.java:
765）
#4android.os.Handler.handleCallback（Handler.java:
615）
#5android.os.Handler.dispatchMessage（Handler.java:
94）
#6android.os.Looper.loop（Looper.java:
256）
#7com.android.server.ServerThread.run（SystemServer.java:
278）
--Breakframe--
============================================================================
Thelogsays:
Receiverpid630hasnotresposedforthebroadcast.
Pid630needsinvestigation.
Dumpprocess630andusegdbtoanalyzeit.
ThreadServerThreadinformationandjavacallstacklistasfollows.threadlistlen=101
（mutexes:
tll=0tsl=0tscl=0ghl=0）
*1"android.server.ServerThread"prio=5tid=12MONITOR
|group="N/A"sCount=0dsCount=0obj=0x42755328self=0x5e0fc008
|sysTid=630nice=0sched=0/0cgrp=handle=0x5e0fc458
-waitingtolock<0x42bfe3a8>（aLjava/util/HashMap;）heldbytid=49（AudioService）
#0android.media.AudioService.handleDeviceConnection（）
#1android.media.AudioService.access$7100（）
#2android.media.AudioService$AudioServiceBroadcastReceiver.onReceive（）
#3android.app.LoadedApk$ReceiverDispatcher$Args.run（）
#4android.os.Handler.handleCallback（）
#5android.os.Handler.dispatchMessage（）
#6android.os.Looper.loop（）
#7com.android.server.ServerThread.run（）
#8---breakframe---
ServerThreadiswaitingforalockheldbytid=49（AudioService）,thread61.
Investigatesourcecodeofthread61tofindoutthesynchronizedlock.
handleDeviceConnection（）@AudioService.java
3521privatebooleanhandleDeviceConnection（booleanconnected,intdevice,Stringparams）{
3522synchronized（mConnectedDevices）{***************
3523booleanisConnected=（mConnectedDevices.containsKey（device）&&
3524（params.isEmpty（）||mConnectedDevices.get（device）.equals（params）））;
3525
3526if（isConnected&&!
connected）{
3527AudioSystem.setDeviceConnectionState（device,
3528AudioSystem.DEVICE_STATE_UNAVAILABLE,
3529mConnectedDevices.get（device））;
3530mConnectedDevices.remove（device）;
3531returntrue;
3532}elseif（!
isConnected&&connected）{
3533AudioSystem.setDeviceConnectionState（device,
3534AudioSystem.DEVICE_STATE_AVAILABLE,
3535params）;
3536mConnectedDevices.put（newInteger（device）,params）;
3537returntrue;
3538}
3539}
3540returnfalse;
3541}
ThreadAudioService'sjavacallstacklistsasfollows.
[Switchingtothread61（LWP805）]
#0__ioctl（）atbionic/libc/arch-arm/syscalls/__ioctl.S:
10
10bionic/libc/arch-arm/syscalls/__ioctl.S:
Nosuchfileordirectory.
#0android.media.AudioSystem.setDeviceConnectionState（）
#1android.media.AudioService.makeA2dpDeviceUnavailableNow（）
#2android.media.AudioService.onSetA2dpConnectionState（）
#3android.media.AudioService.access$6500（）
#4android.media.AudioService$AudioHandler.handleMessage（）
#5android.os.Handler.dispatchMessage（）
#6android.os.Looper.loop（）
#7android.media.AudioService$AudioSystemThread.run（）
#8---breakframe---
ItcanbefoundthatthethreadisinAudioSystem:
:
setDeviceConnectionState（）method,holdingthelockofmConnectedDevicesandwaitingbindercommunicationrespose.Therelatedsourcecode,
onSetA2dpConnectionState（）@AudioService.java
3462privatevoidonSetA2dpConnectionState（BluetoothDevicebtDevice,intstate）
3463{
3464if（btDevice==null）{
3465return;
3466}
3467Stringaddress=btDevice.getAddress（）;
3468if（!
BluetoothAdapter.checkBluetoothAddress（address））{
3469address="";
3470}
3471synchronized（mConnectedDevices）{************
3472booleanisConnected=
3473（mConnectedDevices.containsKey（AudioSystem.DEVICE_OUT_BLUETOOTH_A2DP）&&
3474mConnectedDevices.get（AudioSystem.DEVICE_OUT_BLUETOOTH_A2DP）.equals（address））;
3475
3476if（isConnected&&state!
=BluetoothProfile.STATE_CONNECTED）{
3477if（btDevice.isBluetoothDock（））{
3478if（state==BluetoothProfile.STATE_DISCONNECTED）{
3479//introductionofadelayfortransientdisconnectionsofdockswhen
3480//powerisrapidlyturnedoff/on,thismessagewillbecanceledif
3481//wereconnectthedockunderapresetdelay
3482makeA2dpDeviceUnavailableLater（address）;
3483//thenexttimeisConnectedisevaluated,itwillbefalseforthedock
3484}
3485}else{
3486makeA2dpDeviceUnavailableNow（address）;
3487}
3488synchronized（mCurAudioRoutes）{
3489if（mCurAudioRoutes.mBluetoothName!
=null）{
3490mCurAudioRoutes.mBluetoothName=null;
3491sendMsg（mAudioHandler,MSG_REPORT_NEW_ROUTES,
3492SENDMSG_NOOP,0,0,null,0）;
3493}
3494}
3495}elseif（!
isConnected&&state==BluetoothProfile.STATE_CONNECTED）{
3496if（btDevice.isBluetoothDock（））{
3497//thiscouldbeareconnectionafteratransientdisconnection
3498cancelA2dpDeviceTimeout（）;
3499mDockAddress=address;
3500}else{
3501//thiscouldbeaconnectionofanotherA2DPdevicebeforethetimeoutof
3502//adock:
cancelthedocktimeout,andmakethedockunavailablenow
3503if（hasScheduledA2dpDockTimeout（））{
3504cancelA2dpDeviceTimeout（）;
3505makeA2dpDeviceUnavailableNow（mDockAddress）;
3506}
3507}
3508makeA2dpDeviceAvailable（address）;
3509synchronized（mCurAudioRoutes）{
3510Stringname=btDevice.getAliasName（）;
3511if（!
TextUtils.equals（mCurAudioRoutes.mBluetoothName,name））{
3512mCurAudioRoutes.mBluetoothName=name;
3513sendMsg（mAudioHandler,MSG_REPORT_NEW_ROUTES,
3514SENDMSG_NOOP,0,0,null,0）;
3515}
3516}
3517}
3518}
3519}
makeA2dpDeviceUnavailableNow（）@AudioService.java
3431//mustbecalledsynchronizedonmConnectedDevices
3432privatevoidmakeA2dpDeviceUnavailableNow（Stringaddress）{
3433AudioSystem.setDeviceConnectionState（AudioSystem.DEVICE_OUT_BLUETOOTH_A2DP,********
3434AudioSystem.DEVICE_STATE_UNAVAILABLE,3435address）;3436mConnectedDevices.remove（AudioSystem.DEVICE_OUT_BLUETOOTH_A2DP）;
3437}
Callthefollowingcpplayervianativemethod.
setDeviceConnectionState（）@AudioSystem.cpp
574status_tAudioSystem:
:
setDeviceConnectionState（audio_devices_tdevice,
575audio_policy_dev_state_tstate,
576constchar*device_address）
577{
578constsp&aps=AudioSystem:
:
get_audio_policy_service（）;
579constchar*address="";
580
581if（aps==0）returnPERMISSION_DENIED;
582
583if（device_address!
=NULL）{
584address=device_address;
585}
586
587returnaps->setDeviceConnectionState（device,state,address）;**********
588}
Itiswaitingonblockingbinderio,
ExaminethreadAudioService'snativecallstack..#0__ioctl（）atbionic/libc/arch-arm/syscalls/__ioctl.S:
10
#10x4028b030inioctl（fd=,request=-1072143871）atbionic/libc/bionic/ioctl.c:
41
#20x403f6c08inandroid:
:
IPCThreadState:
:
talkWithDriver（this=0x5cfe6a68,doReceive=）atframeworks/native/libs/binder/IPCThreadState.cpp:
817
#30x403f7134inandroid:
:
IPCThreadState:
:
waitForResponse（this=0x5cfe6a68,reply=0x5f3fac08,acquireResult=0x0）atframeworks/native/libs/binder/IPCThreadState.cpp:
679
#40x403f734einandroid:
:
IPCThreadState:
:
transact（this=0x5cfe6a68,handle=12,code=1,data=...,reply=0x5f3fac08,flags=16）
atframeworks/native/libs/binder/IPCThreadState.cpp:
570
#50x403f4aa6inandroid:
:
BpBinder:
:
transact（this=0x5e00d958,code=1,data=...,reply=0x5f3fac08,flags=0）atframeworks/native/libs/binder/BpBinder.cpp:
165
#60x4118c040inandroid:
:
BpAudioPolicyService:
:
setDeviceConnectionState（this=,device=AUDIO_DEVICE_OUT_BLUETOOTH_A2DP,
state=AUDIO_POLICY_DEVICE_STATE_UNAVAILABLE,device_address=0x5cfdefc0"00:
18:
13:
E0:
D1:
E3"）atframeworks/av/media/libmedia/IAudioPolicyService.cpp:
87
#70x41180bcainandroid:
:
AudioSystem:
:
setDeviceConnectionState（device=AUDIO_DEVICE_OUT_BLUETOOTH_A2DP,state=AUDIO_POLICY_DEVICE_STATE_UNAVAILABLE,
device_address=）atframeworks/av/media/libmedia/AudioSystem.cpp:
577
#80x404c67d2inandroid_media_AudioSystem_setDeviceConnectionState（env=,thiz=,device=128,state=0,device_address=0x26500005）
atframeworks/base/core/jni/android_media_AudioSystem.cpp:
154
#90x40e0e3f4indvmPlatformInvoke（）atdalvik/vm/arch/arm/CallEABI.S:
258
#100x40e3dbb2indvmCallJNIMethod（args=0x40f3de38,pResult=0x5ca26060,method=0x574408d8,self=0x5ca26050）atdalvik/vm/Jni.cpp:
1184
#110x40e178a4indalvik_mterp（）atdalvik/vm/mterp/out/InterpAsm-armv7-a-neon.S:
16311
#120x40e1c40cindvmInterpret（self=0x5ca26050,method=,pResult=0x5f3faeb0）atdalvik/vm/interp/Interp.cpp:
1964
#130x40e50588indvmCallMethodV（self=0x5ca26050,method=0x57734dd0,obj=,fromJni=,pResult=0x5f3faeb0,args=...）
atdalvik/vm/interp/Stack.cpp:
526
#140x40e505b2indvmCallMethod（self=,method=,obj=,pResult=0x5f3faeb0）at
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