网站宽度 自动收缩,国内代理ip免费安卓,烟台优化网站公司,肇庆建设局网站和你一起终身学习#xff0c;这里是程序员Android 经典好文推荐#xff0c;通过阅读本文#xff0c;您将收获以下知识点: 一、MTK AEE Log分析工具二、AEE Log分析流程三、system_server 卡死案例分析及解决 本文主要针对 Exception Type: system_server_watchdog , system_… 和你一起终身学习这里是程序员Android 经典好文推荐通过阅读本文您将收获以下知识点: 一、MTK AEE Log分析工具二、AEE Log分析流程三、system_server 卡死案例分析及解决 本文主要针对 Exception Type: system_server_watchdog , system_server卡死找出的分析以及解决方案。 一、MTK AEE Log分析工具 MTK AEE Log 获取方式 程序员Android回复 aee 即可获取解析重启db log的工具。 二、AEE Log分析流程 1. 使用AEE 工具解析 dbg 文件。 使用解析db.fatal.02.SWT.dbg AEE Log 解析出来的文件 2.分析解析出来的exp_main等文件 exp_main 文件会记录发生重启时候的 log 打印信息。 部分重启异常 Log信息如下 $** *** *** *** *** *** *** *** Fatal *** *** *** *** *** *** *** **$
Build Info: alps-mp-o1.mp7:alps-mp-o1.mp7:mt6765:S01,ACE/AS0618/AS0618:8.1.0/O11019/1548123508:user/release-keys
Flavor Info: None
Exception Log Time:[Thu Mar 14 14:00:03 CST 2019] [38684.729626]Exception Class: SWT
Exception Type: system_server_watchdogCurrent Executing Process:
system_serverTrigger time:[2019-03-14 14:00:03.711844] pid:1029Backtrace:
Process: system_server
Subject: Blocked in handler on ActivityManager (ActivityManager)
Build: ACE/AS0618/AS0618:8.1.0/O11019/1548123508:user/release-keys 3.exp_main 文件解析 从开头的Log总体信息概览我们可以看到 发生重启的时间、类型触发重启的进程以及PID、系统Blocked 的地方。 结合exp_main以及 trace分析重启 LogLog分析如下 // 1.重启触发时间以及PID
Trigger time:[2019-03-14 14:00:03.711844] pid:1029
// 2.Blocked 的进程
Backtrace:
Process: system_server
Subject: Blocked in handler on ActivityManager (ActivityManager)
// 3.根据PID 查看Trace信息
----- pid 1029 at 2019-03-14 13:59:58 -----
Cmd line: system_server... ...
// 4.根据Backtrace 查看Blocked的信息
ActivityManager prio5 tid11 Blocked... ...
// 5.tid11 等待 tid106的线程释放资源锁- waiting to lock 0x090691f3 (a android.util.ArrayMap) held by thread 106
... ...// 6.查看tid 106 持锁情况
backup prio5 tid106 Waiting
... ... at java.lang.Object.wait(Native method)- waiting on 0x06a44c62 (a com.android.server.am.ContentProviderRecord)
// 7.死锁卡住的地方at com.android.server.am.ActivityManagerService.getContentProviderImpl(ActivityManagerService.java:12127)- locked 0x06a44c62 (a com.android.server.am.ContentProviderRecord)... ...Binder:1029_8 prio5 tid107 Blocked
// 8.log中 tid107 被 106 Blocked 进一步问题的加重at com.android.server.notification.RankingHelper.getRecord(RankingHelper.java:258)- waiting to lock 0x090691f3 (a android.util.ArrayMap) held by thread 106$** *** *** *** *** *** *** *** Fatal *** *** *** *** *** *** *** **$ Log 分析大致过程截图 完整 log 请在公众号上获取 三、system_server 卡死案例分析及解决 通过 Log 找到卡死原因后解决此问题。需要修改ActivityManagerService类。 1.修改代码路径如下alps/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java 2.解决思路 避免 provider 长时间持锁触发MTK 60s 的SWT 重启机制设置超时时间超过时间就要释放资源锁避免发生此问题。 3.diff 修改方案如下 --- a/[alps/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java](http://192.168.11.104/gitweb/?palps-mp-o1.mp1-V1.git;ablob;falps/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java;hd5e2e1411f3698a829e997d402c7482ec277fa8c;hbd5e2e1411f3698a829e997d402c7482ec277fa8c) b/[alps/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java](http://192.168.11.104/gitweb/?palps-mp-o1.mp1-V1.git;ablob;falps/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java;h03208f78a2bf3167b4f0790019326e3939cc5444;hb03208f78a2bf3167b4f0790019326e3939cc5444) [-545,7](http://192.168.11.104/gitweb/?palps-mp-o1.mp1-V1.git;ablob;falps/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java;hd5e2e1411f3698a829e997d402c7482ec277fa8c;hbd5e2e1411f3698a829e997d402c7482ec277fa8c#l545) [545,9](http://192.168.11.104/gitweb/?palps-mp-o1.mp1-V1.git;ablob;falps/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java;h03208f78a2bf3167b4f0790019326e3939cc5444;hb03208f78a2bf3167b4f0790019326e3939cc5444#l545) public class ActivityManagerService extends IActivityManager.Stub// How long we wait for an attached process to publish its content providers// before we decide it must be hung.static final int CONTENT_PROVIDER_PUBLISH_TIMEOUT 10*1000;- // How long we wait for provider to be notify before we decide it may be hung. static final int CONTENT_PROVIDER_WAIT_TIMEOUT 20*1000; // How long we wait for a launched process to attach to the activity manager// before we decide its never going to come up for real, when the process was// started with a wrapper for instrumentation (such as Valgrind) because it [-1745,6](http://192.168.11.104/gitweb/?palps-mp-o1.mp1-V1.git;ablob;falps/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java;hd5e2e1411f3698a829e997d402c7482ec277fa8c;hbd5e2e1411f3698a829e997d402c7482ec277fa8c#l1745) [1747,7](http://192.168.11.104/gitweb/?palps-mp-o1.mp1-V1.git;ablob;falps/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java;h03208f78a2bf3167b4f0790019326e3939cc5444;hb03208f78a2bf3167b4f0790019326e3939cc5444#l1747) public class ActivityManagerService extends IActivityManager.Stubstatic final int PUSH_TEMP_WHITELIST_UI_MSG 68;static final int SERVICE_FOREGROUND_CRASH_MSG 69;static final int DISPATCH_OOM_ADJ_OBSERVER_MSG 70; static final int CONTENT_PROVIDER_WAIT_TIMEOUT_MSG 71;static final int START_USER_SWITCH_FG_MSG 712;static final int NOTIFY_VR_KEYGUARD_MSG 74; [-2108,6](http://192.168.11.104/gitweb/?palps-mp-o1.mp1-V1.git;ablob;falps/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java;hd5e2e1411f3698a829e997d402c7482ec277fa8c;hbd5e2e1411f3698a829e997d402c7482ec277fa8c#l2108) [2111,12](http://192.168.11.104/gitweb/?palps-mp-o1.mp1-V1.git;ablob;falps/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java;h03208f78a2bf3167b4f0790019326e3939cc5444;hb03208f78a2bf3167b4f0790019326e3939cc5444#l2111) public class ActivityManagerService extends IActivityManager.Stubsynchronized (ActivityManagerService.this) {mActivityStarter.doPendingActivityLaunchesLocked(true);} } break; case CONTENT_PROVIDER_WAIT_TIMEOUT_MSG: { ContentProviderRecord cpr (ContentProviderRecord)msg.obj; synchronized (ActivityManagerService.this) { processContentProviderWaitTimedOutLocked(cpr); }} break;case KILL_APPLICATION_MSG: {synchronized (ActivityManagerService.this) { [-7029,7](http://192.168.11.104/gitweb/?palps-mp-o1.mp1-V1.git;ablob;falps/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java;hd5e2e1411f3698a829e997d402c7482ec277fa8c;hbd5e2e1411f3698a829e997d402c7482ec277fa8c#l7029) [7038,31](http://192.168.11.104/gitweb/?palps-mp-o1.mp1-V1.git;ablob;falps/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java;h03208f78a2bf3167b4f0790019326e3939cc5444;hb03208f78a2bf3167b4f0790019326e3939cc5444#l7038) public class ActivityManagerService extends IActivityManager.StubcleanupAppInLaunchingProvidersLocked(app, true);removeProcessLocked(app, false, true, timeout publishing content providers);} GuardedBy(this) private final void processContentProviderWaitTimedOutLocked(ContentProviderRecord cpr) { try { if (mLaunchingProviders.contains(cpr)) { if (DEBUG_MU) Slog.v(TAG_MU, Remove from mLaunchingProviders, cpr launchingApp cpr.launchingApp); mLaunchingProviders.remove(cpr); } if (DEBUG_MU) Slog.v(TAG_MU, RemoveMessages CONTENT_PROVIDER_WAIT_TIMEOUT_MSG, cpr launchingApp cpr.launchingApp); mHandler.removeMessages(CONTENT_PROVIDER_WAIT_TIMEOUT_MSG, cpr); synchronized (cpr) { cpr.notifyAll(); cpr.launchingApp null; } } catch (Exception e) { if (DEBUG_MU) Slog.v(TAG_MU, processContentProviderWaitTimedOutLocked exception, e); } } private final void processStartTimedOutLocked(ProcessRecord app) {final int pid app.pid;boolean gone false; [-12124,11](http://192.168.11.104/gitweb/?palps-mp-o1.mp1-V1.git;ablob;falps/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java;hd5e2e1411f3698a829e997d402c7482ec277fa8c;hbd5e2e1411f3698a829e997d402c7482ec277fa8c#l12124) [12157,33](http://192.168.11.104/gitweb/?palps-mp-o1.mp1-V1.git;ablob;falps/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java;h03208f78a2bf3167b4f0790019326e3939cc5444;hb03208f78a2bf3167b4f0790019326e3939cc5444#l12157) public class ActivityManagerService extends IActivityManager.Stubif (conn ! null) {conn.waiting true;} // add 20s wait timeoutavoid if (!mHandler.hasMessages(CONTENT_PROVIDER_WAIT_TIMEOUT_MSG, cpr)) { if (DEBUG_MU) Slog.v(TAG_MU, SendMessageDelayed CONTENT_PROVIDER_WAIT_TIMEOUT_MSG, cpr launchingApp cpr.launchingApp); Message msg mHandler.obtainMessage(CONTENT_PROVIDER_WAIT_TIMEOUT_MSG); msg.obj cpr; mHandler.sendMessageDelayed(msg, CONTENT_PROVIDER_WAIT_TIMEOUT); } else { if (DEBUG_MU) Slog.v(TAG_MU, There is another waiting to start provider cpr launchingApp cpr.launchingApp , not send CONTENT_PROVIDER_WAIT_TIMEOUT_MSG again); } cpr.wait();} catch (InterruptedException ex) {} finally {if (conn ! null) {conn.waiting false; } // remove wait time out message if (mHandler.hasMessages(CONTENT_PROVIDER_WAIT_TIMEOUT_MSG, cpr)) { if (DEBUG_MU) Slog.v(TAG_MU, After wait removeMessages CONTENT_PROVIDER_WAIT_TIMEOUT_MSG, cpr launchingApp cpr.launchingApp); mHandler.removeMessages(CONTENT_PROVIDER_WAIT_TIMEOUT_MSG, cpr);}}} 参考文献 【腾讯文档】Android Framework 知识库https://docs.qq.com/doc/DSXBmSG9VbEROUXF5 友情推荐 Android 开发干货集锦 至此本篇已结束。转载网络的文章小编觉得很优秀欢迎点击阅读原文支持原创作者如有侵权恳请联系小编删除欢迎您的建议与指正。同时期待您的关注感谢您的阅读谢谢 点击阅读原文为大佬点赞
