1. ANR
Application within a certain time because the main thread is blocked and did not make the appropriate system will kill the process and dump stack information to / data / anr directory. Check ANR log requires two types of log, required event log, log in and logcat log / data / anr. Both log is mainly to find out the type of information and processes occur ARN number of ANR occurs, take the example of the Internet to be a description:
If event log, search for "am_anr" Keywords:
10-01 18:12:49.599 4600 4614 I am_anr : [0,29761,com.google.android.youtube,953695941,executing service com.google.android.youtube/com.google.android.apps.youtube.app.offline.transfer.OfflineTransferService] 10-01 18:14:10.211 4600 4614 I am_anr : [0,30363,com.google.android.apps.plus,953728580,executing service com.google.android.apps.plus/com.google.android.apps.photos.service.PhotosService]
If logcat log, search for the keyword "ANR":
10-01 18:13:11.984 4600 4614 E ActivityManager: ANR in com.google.android.youtube 10-01 18:14:31.720 4600 4614 E ActivityManager: ANR in com.google.android.apps.plus 10-01 18:14:31.720 4600 4614 E ActivityManager: PID: 30363 10-01 18:14:31.720 4600 4614 E ActivityManager: Reason: executing service com.google.android.apps.plus/com.google.android.apps.photos.service.PhotosService 10-01 18:14:31.720 4600 4614 E ActivityManager: Load: 35.27 / 23.9 / 16.18 10-01 18:14:31.720 4600 4614 E ActivityManager: CPU usage from 16ms to 21868ms later: 10-01 18:14:31.720 4600 4614 E ActivityManager: 74% 3361/mm-qcamera-daemon: 62% user + 12% kernel / faults: 15276 minor 10 major 10-01 18:14:31.720 4600 4614 E ActivityManager: 41% 4600/system_server: 18% user + 23% kernel / faults: 18597 minor 309 major 10-01 18:14:31.720 4600 4614 E ActivityManager: 32% 27420/com.google.android.GoogleCamera: 24% user + 7.8% kernel / faults: 48374 minor 338 major 10-01 18:14:31.720 4600 4614 E ActivityManager: 16% 130/kswapd0: 0% user + 16% kernel 10-01 18:14:31.720 4600 4614 E ActivityManager: 15% 283/mmcqd/0: 0% user + 15% kernel ... 10-01 18:14:31.720 4600 4614 E ActivityManager: 0.1% 27248/irq/503-synapti: 0% 10-01 18:14:31.721 4600 4614 I ActivityManager: Killing 30363:com.google.android.
With these two log we can see that the process 30363 ANR occurs when performing com.google.android.apps.plus/com.google.android.apps.photos.service.PhotosService, event log more concise, but it needs against EventLogTags.logtags read the document, logcat some more accessible.
Then need to look at / data / anr under traces.txt stack information file, the main considerations is to look at the stack information file corresponds to ensure that the traces.txt ANR, because the system may occur several times ARN, / data / anr under path
may have multiple files, then we need to find information on the occurrence of ANR stack process:
----- pid 30363 at 2015-10-01 18:14:11 ----- Cmd line: com.google.android.apps.plus Build fingerprint: 'google/angler/angler:6.0/MDA89D/2294819:userdebug/dev-keys' ABI: 'arm' Build type: optimized Zygote loaded classes=3978 post zygote classes=27 Intern table: 45068 strong; 21 weak JNI: CheckJNI is off; globals=283 (plus 360 weak) Libraries: /system/lib/libandroid.so /system/lib/libcompiler_rt.so /system/lib/libjavacrypto.so /system/lib/libjnigraphics.so /system/lib/libmedia_jni.so /system/lib/libwebviewchromium_loader.so libjavacore.so (7) Heap: 29% free, 21MB/30MB; 32251 objects Dumping cumulative Gc timings Total number of allocations 32251 Total bytes allocated 21MB Total bytes freed 0B Free memory 9MB Free memory until GC 9MB Free memory until OOME 490MB Total memory 30MB Max memory 512MB Zygote space size 1260KB Total mutator paused time: 0 Total time waiting for GC to complete: 0 Total GC count: 0 Total GC time: 0 Total blocking GC count: 0 Total blocking GC time: 0 suspend all histogram: Sum: 119.728ms 99% C.I. 0.010ms-107.765ms Avg: 5.442ms Max: 119.562ms DALVIK THREADS (12): "Signal Catcher" daemon prio=5 tid=2 Runnable | group="system" sCount=0 dsCount=0 obj=0x12c400a0 self=0xef460000 | sysTid=30368 nice=0 cgrp=default sched=0/0 handle=0xf4a69930 | state=R schedstat=( 9021773 5500523 26 ) utm=0 stm=0 core=1 HZ=100 | stack=0xf496d000-0xf496f000 stackSize=1014KB | held mutexes= "mutator lock"(shared held) native: #00 pc 0035a217 /system/lib/libart.so (art::DumpNativeStack(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, int, char const*, art::ArtMethod*, void*)+126) native: #01 pc 0033b03b /system/lib/libart.so (art::Thread::Dump(std::__1::basic_ostream<char, std::__1::char_traits<char> >&) const+138) native: #02 pc 00344701 /system/lib/libart.so (art::DumpCheckpoint::Run(art::Thread*)+424) native: #03 pc 00345265 /system/lib/libart.so (art::ThreadList::RunCheckpoint(art::Closure*)+200) native: #04 pc 00345769 /system/lib/libart.so (art::ThreadList::Dump(std::__1::basic_ostream<char, std::__1::char_traits<char> >&)+124) native: #05 pc 00345e51 /system/lib/libart.so (art::ThreadList::DumpForSigQuit(std::__1::basic_ostream<char, std::__1::char_traits<char> >&)+312) native: #06 pc 0031f829 /system/lib/libart.so (art::Runtime::DumpForSigQuit(std::__1::basic_ostream<char, std::__1::char_traits<char> >&)+68) native: #07 pc 00326831 /system/lib/libart.so (art::SignalCatcher::HandleSigQuit()+896) native: #08 pc 003270a1 /system/lib/libart.so (art::SignalCatcher::Run(void*)+324) native: #09 pc 0003f813 /system/lib/libc.so (__pthread_start(void*)+30) native: #10 pc 00019f75 /system/lib/libc.so (__start_thread+6) (no managed stack frames) "main" prio=5 tid=1 Suspended | group="main" sCount=1 dsCount=0 obj=0x747552a0 self=0xf5376500 | sysTid=30363 nice=0 cgrp=default sched=0/0 handle=0xf74feb34 | state=S schedstat=( 331107086 164153349 851 ) utm=6 stm=27 core=3 HZ=100 | stack=0xff00f000-0xff011000 stackSize=8MB | held mutexes= kernel: __switch_to+0x7c/0x88 kernel: futex_wait_queue_me+0xd4/0x130 kernel: futex_wait+0xf0/0x1f4 kernel: do_futex+0xcc/0x8f4 kernel: compat_SyS_futex+0xd0/0x14c kernel: cpu_switch_to+0x48/0x4c native: #00 pc 000175e8 /system/lib/libc.so (syscall+28) native: #01 pc 000f5ced /system/lib/libart.so (art::ConditionVariable::Wait(art::Thread*)+80) native: #02 pc 00335353 /system/lib/libart.so (art::Thread::FullSuspendCheck()+838) native: #03 pc 0011d3a7 /system/lib/libart.so (art::ClassLinker::LoadClassMembers(art::Thread*, art::DexFile const&, unsigned char const*, art::Handle<art::mirror::Class>, art::OatFile::OatClass const*)+746) native: #04 pc 0011d81d /system/lib/libart.so (art::ClassLinker::LoadClass(art::Thread*, art::DexFile const&, art::DexFile::ClassDef const&, art::Handle<art::mirror::Class>)+88) native: #05 pc 00132059 /system/lib/libart.so (art::ClassLinker::DefineClass(art::Thread*, char const*, unsigned int, art::Handle<art::mirror::ClassLoader>, art::DexFile const&, art::DexFile::ClassDef const&)+320) native: #06 pc 001326c1 /system/lib/libart.so (art::ClassLinker::FindClassInPathClassLoader(art::ScopedObjectAccessAlreadyRunnable&, art::Thread*, char const*, unsigned int, art::Handle<art::mirror::ClassLoader>, art::mirror::Class**)+688) native: #07 pc 002cb1a1 /system/lib/libart.so (art::VMClassLoader_findLoadedClass(_JNIEnv*, _jclass*, _jobject*, _jstring*)+264) native: #08 pc 002847fd /data/dalvik-cache/arm/system@[email protected] (Java_java_lang_VMClassLoader_findLoadedClass__Ljava_lang_ClassLoader_2Ljava_lang_String_2+112) at java.lang.VMClassLoader.findLoadedClass!(Native method) at java.lang.ClassLoader.findLoadedClass(ClassLoader.java:362) at java.lang.ClassLoader.loadClass(ClassLoader.java:499) at java.lang.ClassLoader.loadClass(ClassLoader.java:469) at android.app.ActivityThread.installProvider(ActivityThread.java:5141) at android.app.ActivityThread.installContentProviders(ActivityThread.java:4748) at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4688) at android.app.ActivityThread.-wrap1(ActivityThread.java:-1) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1405) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke!(Native method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) ... Stacks for other threads in this process follow ...
2. Deadlock
For general applications, often in the form of a deadlock ANR, but if it is for a system server process, the watchdog system server process will be killed, causing the system to reboot, and this situation will be similar to the "WATCHDOG KILLING SYSTEM PROCESS" this log appears.
Check for this problem, you need to check the VM log, then logcat to die, catch log dumpstate it, and then search for "Blocked" and "held by thread" keyword, and then little by little careful examination, such as the following online the log:
"Binder_B" prio=5 tid=73 Blocked | group="main" sCount=1 dsCount=0 obj=0x13faa0a0 self=0x95e24800 | sysTid=2016 nice=0 cgrp=default sched=0/0 handle=0x8b68d930 | state=S schedstat=( 9351576559 4141431119 16920 ) utm=819 stm=116 core=1 HZ=100 | stack=0x8b591000-0x8b593000 stackSize=1014KB | held mutexes= at com.android.server.pm.UserManagerService.exists(UserManagerService.java:387) - waiting to lock <0x025f9b02> (a android.util.ArrayMap) **held by thread 20** at com.android.server.pm.PackageManagerService.getApplicationInfo(PackageManagerService.java:2848) at com.android.server.AppOpsService.getOpsRawLocked(AppOpsService.java:881) at com.android.server.AppOpsService.getOpsLocked(AppOpsService.java:856) at com.android.server.AppOpsService.noteOperationUnchecked(AppOpsService.java:719) - locked <0x0231885a> (a com.android.server.AppOpsService) at com.android.server.AppOpsService.noteOperation(AppOpsService.java:713) at com.android.server.AppOpsService$2.getMountMode(AppOpsService.java:260) at com.android.server.MountService$MountServiceInternalImpl.getExternalStorageMountMode(MountService.java:3416) at com.android.server.am.ActivityManagerService.startProcessLocked(ActivityManagerService.java:3228) at com.android.server.am.ActivityManagerService.startProcessLocked(ActivityManagerService.java:3170) at com.android.server.am.ActivityManagerService.startProcessLocked(ActivityManagerService.java:3059) at com.android.server.am.BroadcastQueue.processNextBroadcast(BroadcastQueue.java:1070) - locked <0x044d166f> (a com.android.server.am.ActivityManagerService) at com.android.server.am.ActivityManagerService.finishReceiver(ActivityManagerService.java:16950) at android.app.ActivityManagerNative.onTransact(ActivityManagerNative.java:494) at com.android.server.am.ActivityManagerService.onTransact(ActivityManagerService.java:2432) at android.os.Binder.execTransact(Binder.java:453) ... "PackageManager" prio=5 tid=20 Blocked | group="main" sCount=1 dsCount=0 obj=0x1304f4a0 self=0xa7f43900 | sysTid=1300 nice=10 cgrp=bg_non_interactive sched=0/0 handle=0x9fcf9930 | state=S schedstat=( 26190141996 13612154802 44357 ) utm=2410 stm=209 core=2 HZ=100 | stack=0x9fbf7000-0x9fbf9000 stackSize=1038KB | held mutexes= at com.android.server.AppOpsService.noteOperationUnchecked(AppOpsService.java:718) - waiting to lock <0x0231885a> (a com.android.server.AppOpsService) **held by thread 73** at com.android.server.AppOpsService.noteOperation(AppOpsService.java:713) at com.android.server.AppOpsService$2.getMountMode(AppOpsService.java:260) at com.android.server.AppOpsService$2.hasExternalStorage(AppOpsService.java:273) at com.android.server.MountService$MountServiceInternalImpl.hasExternalStorage(MountService.java:3431) at com.android.server.MountService.getVolumeList(MountService.java:2609) at android.os.storage.StorageManager.getVolumeList(StorageManager.java:880) at android.os.Environment$UserEnvironment.getExternalDirs(Environment.java:83) at android.os.Environment.isExternalStorageEmulated(Environment.java:708) at com.android.server.pm.PackageManagerService.isExternalMediaAvailable(PackageManagerService.java:9327) at com.android.server.pm.PackageManagerService.startCleaningPackages(PackageManagerService.java:9367) - locked <0x025f9b02> (a android.util.ArrayMap) at com.android.server.pm.PackageManagerService$PackageHandler.doHandleMessage(PackageManagerService.java:1320) at com.android.server.pm.PackageManagerService$PackageHandler.handleMessage(PackageManagerService.java:1122) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.os.HandlerThread.run(HandlerThread.java:61) at com.android.server.ServiceThread.run(ServiceThread.java:46)
73 is a thread lock to hold the thread 20, and lock the thread 20 thread 73 application is held.
3. Activities
Look focus of activity, key am_focused_activity
Start the process of history, keyword Start proc
Confirm whether the device jitter, keywords am_proc_died and am_proc_start, check if there has been a lot of this log in a short time.
Reference: General Analytical Method Android log: https: //blog.csdn.net/moonshine2016/article/details/55669408