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问题背景

前置操作：

替换原system/priv-app 目录下已有的应用包未未签名的debug版本，然后重启。

现象：

无法正常开机，卡在开机动画，并且pm没有起来，因为执行adb install 命令是返回“cmd: Can't find service: package”。

应用信息：

跟Settings系统应用在同一进程。

<manifest xmlns:android="http://schemas.android.com/apk/res/android"coreApp="true"package="com.demo.unit"android:sharedUserId="android.uid.system"><uses-sdk android:minSdkVersion="28" />

日志分析

//按size值依次添加应用包

11-12 16:36:42.139  3310  3310 D PERF/BehaviorHuber: addPackage-> uid=10059, pkg=com.android.soundpicker, type=643777, size=143

11-12 16:36:42.140  3310  3310 D PERF/BehaviorHuber: addPackage-> uid=2000, pkg=com.android.shell, type=128001, size=144
11-12 16:36:42.144  3310  3310 D PERF/BehaviorHuber: addPackage-> uid=10078, pkg=com.google.android.tag, type=644995, size=146

很明显zygote进程都没跑起来

11-12 16:36:42.146  3310  3310 I PackageManager: /system/priv-app/DemoUnit changed; collecting certs
11-12 16:36:42.149  3310  3310 I Watchdog: Resuming HandlerChecker: main thread for reason: packagemanagermain. Pause count: 0
11-12 16:36:42.149  3310  3310 E System  : ******************************************
11-12 16:36:42.149  3310  3310 E System  : ************ Failure starting system services
11-12 16:36:42.149  3310  3310 E System  : java.lang.IllegalStateException: Signature mismatch on system package com.demo.unit for shared user SharedUserSetting{73b98d7 android.uid.system/1000}
11-12 16:36:42.149  3310  3310 E System  :     at com.android.server.pm.ReconcilePackageUtils.reconcilePackages(ReconcilePackageUtils.java:284)
11-12 16:36:42.149  3310  3310 E System  :     at com.android.server.pm.InstallPackageHelper.addForInitLI(InstallPackageHelper.java:3988)
11-12 16:36:42.149  3310  3310 E System  :     at com.android.server.pm.InstallPackageHelper.installPackagesFromDir(InstallPackageHelper.java:3797)
11-12 16:36:42.149  3310  3310 E System  :     at com.android.server.pm.InitAppsHelper.scanDirTracedLI(InitAppsHelper.java:463)
11-12 16:36:42.149  3310  3310 E System  :     at com.android.server.pm.InitAppsHelper.scanSystemDirs(InitAppsHelper.java:418)
11-12 16:36:42.149  3310  3310 E System  :     at com.android.server.pm.InitAppsHelper.initSystemApps(InitAppsHelper.java:209)
11-12 16:36:42.149  3310  3310 E System  :     at com.android.server.pm.PackageManagerService.<init>(PackageManagerService.java:2362)
11-12 16:36:42.149  3310  3310 E System  :     at com.android.server.pm.PackageManagerService.main(PackageManagerService.java:1806)
11-12 16:36:42.149  3310  3310 E System  :     at com.android.server.SystemServer.startBootstrapServices(SystemServer.java:1366)
11-12 16:36:42.149  3310  3310 E System  :     at com.android.server.SystemServer.run(SystemServer.java:983)
11-12 16:36:42.149  3310  3310 E System  :     at com.android.server.SystemServer.main(SystemServer.java:685)
11-12 16:36:42.149  3310  3310 E System  :     at java.lang.reflect.Method.invoke(Native Method)
11-12 16:36:42.149  3310  3310 E System  :     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:617)
11-12 16:36:42.149  3310  3310 E System  :     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:980)
11-12 16:36:42.149  3310  3310 V SystemServerTiming: StartPackageManagerService took to complete: 784ms
11-12 16:36:42.150  3310  3310 E Zygote  : System zygote died with fatal exception
11-12 16:36:42.150  3310  3310 E Zygote  : java.lang.IllegalStateException: Signature mismatch on system package com.demo.unit for shared user SharedUserSetting{73b98d7 android.uid.system/1000}
11-12 16:36:42.150  3310  3310 E Zygote  :     at com.android.server.pm.ReconcilePackageUtils.reconcilePackages(ReconcilePackageUtils.java:284)
11-12 16:36:42.150  3310  3310 E Zygote  :     at com.android.server.pm.InstallPackageHelper.addForInitLI(InstallPackageHelper.java:3988)
11-12 16:36:42.150  3310  3310 E Zygote  :     at com.android.server.pm.InstallPackageHelper.installPackagesFromDir(InstallPackageHelper.java:3797)
11-12 16:36:42.150  3310  3310 E Zygote  :     at com.android.server.pm.InitAppsHelper.scanDirTracedLI(InitAppsHelper.java:463)
11-12 16:36:42.150  3310  3310 E Zygote  :     at com.android.server.pm.InitAppsHelper.scanSystemDirs(InitAppsHelper.java:418)
11-12 16:36:42.150  3310  3310 E Zygote  :     at com.android.server.pm.InitAppsHelper.initSystemApps(InitAppsHelper.java:209)
11-12 16:36:42.150  3310  3310 E Zygote  :     at com.android.server.pm.PackageManagerService.<init>(PackageManagerService.java:2362)
11-12 16:36:42.150  3310  3310 E Zygote  :     at com.android.server.pm.PackageManagerService.main(PackageManagerService.java:1806)
11-12 16:36:42.150  3310  3310 E Zygote  :     at com.android.server.SystemServer.startBootstrapServices(SystemServer.java:1366)
11-12 16:36:42.150  3310  3310 E Zygote  :     at com.android.server.SystemServer.run(SystemServer.java:983)
11-12 16:36:42.150  3310  3310 E Zygote  :     at com.android.server.SystemServer.main(SystemServer.java:685)
11-12 16:36:42.150  3310  3310 E Zygote  :     at java.lang.reflect.Method.invoke(Native Method)
11-12 16:36:42.150  3310  3310 E Zygote  :     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:617)
11-12 16:36:42.150  3310  3310 E Zygote  :     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:980)
11-12 16:36:42.150  3310  3310 D AndroidRuntime: Shutting down VM
--------- beginning of crash
11-12 16:36:42.150  3310  3310 E AndroidRuntime: *** FATAL EXCEPTION IN SYSTEM PROCESS: main
11-12 16:36:42.150  3310  3310 E AndroidRuntime: java.lang.IllegalStateException: Signature mismatch on system package com.demo.unit for shared user SharedUserSetting{73b98d7 android.uid.system/1000}
11-12 16:36:42.150  3310  3310 E AndroidRuntime:     at com.android.server.pm.ReconcilePackageUtils.reconcilePackages(ReconcilePackageUtils.java:284)
11-12 16:36:42.150  3310  3310 E AndroidRuntime:     at com.android.server.pm.InstallPackageHelper.addForInitLI(InstallPackageHelper.java:3988)
11-12 16:36:42.150  3310  3310 E AndroidRuntime:     at com.android.server.pm.InstallPackageHelper.installPackagesFromDir(InstallPackageHelper.java:3797)
11-12 16:36:42.150  3310  3310 E AndroidRuntime:     at com.android.server.pm.InitAppsHelper.scanDirTracedLI(InitAppsHelper.java:463)
11-12 16:36:42.150  3310  3310 E AndroidRuntime:     at com.android.server.pm.InitAppsHelper.scanSystemDirs(InitAppsHelper.java:418)
11-12 16:36:42.150  3310  3310 E AndroidRuntime:     at com.android.server.pm.InitAppsHelper.initSystemApps(InitAppsHelper.java:209)
11-12 16:36:42.150  3310  3310 E AndroidRuntime:     at com.android.server.pm.PackageManagerService.<init>(PackageManagerService.java:2362)
11-12 16:36:42.150  3310  3310 E AndroidRuntime:     at com.android.server.pm.PackageManagerService.main(PackageManagerService.java:1806)
11-12 16:36:42.150  3310  3310 E AndroidRuntime:     at com.android.server.SystemServer.startBootstrapServices(SystemServer.java:1366)
11-12 16:36:42.150  3310  3310 E AndroidRuntime:     at com.android.server.SystemServer.run(SystemServer.java:983)
11-12 16:36:42.150  3310  3310 E AndroidRuntime:     at com.android.server.SystemServer.main(SystemServer.java:685)
11-12 16:36:42.150  3310  3310 E AndroidRuntime:     at java.lang.reflect.Method.invoke(Native Method)
11-12 16:36:42.150  3310  3310 E AndroidRuntime:     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:617)
11-12 16:36:42.150  3310  3310 E AndroidRuntime:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:980)
11-12 16:36:42.152  3310  3310 E AndroidRuntime: Error reporting crash
11-12 16:36:42.152  3310  3310 E AndroidRuntime: java.lang.NullPointerException: Attempt to invoke interface method 'void android.app.IActivityManager.handleApplicationCrash(android.os.IBinder, android.app.ApplicationErrorReport$ParcelableCrashInfo)' on a null object reference
11-12 16:36:42.152  3310  3310 E AndroidRuntime:     at com.android.internal.os.RuntimeInit$KillApplicationHandler.uncaughtException(RuntimeInit.java:207)
11-12 16:36:42.152  3310  3310 E AndroidRuntime:     at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:1071)
11-12 16:36:42.152  3310  3310 E AndroidRuntime:     at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:1066)
11-12 16:36:42.152  3310  3310 E AndroidRuntime:     at java.lang.Thread.dispatchUncaughtException(Thread.java:2306)
11-12 16:36:42.152  3310  3310 I Process : Sending signal. PID: 3310 SIG: 9
11-12 16:36:42.188  3129  3129 E Zygote  : Zygote failed to write to system_server FD: Connection refused
11-12 16:36:42.188  3129  3129 I Zygote  : Process 3310 exited due to signal 9 (Killed)
11-12 16:36:42.188  3129  3129 W libc    : Access denied finding property "ro.vendor.iqi"
11-12 16:36:42.188  3129  3129 D Zygote  : IQI Zygote  false
11-12 16:36:42.188  3129  3129 E Zygote  : Exit zygote because system server (pid 3310) has terminated
11-12 16:36:42.229  3133  3133 D DeviceHAL: closeOutputStream mOpenedStreamsCount 5
11-12 16:36:42.229  3133  3142 D DeviceHAL: ~Device ++, doClose()
11-12 16:36:42.229  3133  3142 D DeviceHAL: doClose mIsClosed 0, mOpenedStreamsCount 0
11-12 16:36:42.229  3133  3133 D AudioALSAStreamManager: +closeOutputStream(), out = 0xb40000713de38100, mStreamOutVector.size() = 5
11-12 16:36:42.229  3133  3142 I r_submix: adev_close()
11-12 16:36:42.229  3133  3142 D DeviceHAL: ~Device --
11-12 16:36:42.229  3133  3141 D DeviceHAL: closeOutputStream mOpenedStreamsCount 5

参考资料

The Android Boot Processhttps://copperhead.co/blog/android-boot-process/

 

1. Boot ROM code execution

2. The bootloader

3. The Linux kernel

4. The ‘Init’ process

5. Zygote and Dalvik VM

6. The System Server and Managers

 

Zygote launches the system services and forks a new process to launch.