Android 开机Process xxx (pid xxxx) has died问题分析
系统中有一个监听BOOT_COMPLETED广播的自启应用，概率性出现启动后被kill掉的现象。Log如下：
08-12 16:48:40.453 773 908 I ActivityManager: Process com.test.xxx (pid 2376) has died
08-12 16:48:40.453 773 908 D ActivityManager: SVC-handleAppDiedLocked: app = ProcessRecord{19911aa7 2376:com.test.xxx/u0a41}, app.pid = 2376
08-12 16:48:40.453 773 908 D ActivityManager: SVC-mBroadcastQueues: com.android.server.am.BroadcastQueue@260b97c9
08-12 16:48:40.453 773 908 D ActivityManager: SVC-mBroadcastQueues: com.android.server.am.BroadcastQueue@29a50ece
Log出处：
frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
final void appDiedLocked(ProcessRecord app, int pid, IApplicationThread thread) {
// First check if this ProcessRecord is actually active for the pid.
synchronized (mPidsSelfLocked) {
ProcessRecord curProc = mPidsSelfLocked.get(pid);
if (curProc != app) {
Slog.w(TAG, "Spurious death for " + app + ", curProc for " + pid + ": " + curProc);
return;
}
}
BatteryStatsImpl stats = mBatteryStatsService.getActiveStatistics();
synchronized (stats) {
stats.noteProcessDiedLocked(app.info.uid, pid);
}
if (!app.killed) {
Process.killProcessQuiet(pid);
Process.killProcessGroup(app.uid, pid);
app.killed = true;
}
// Clean up already done if the process has been re-started.
if (app.pid == pid && app.thread != null &&
app.thread.asBinder() == thread.asBinder()) {
boolean doLowMem = app.instrumentationClass == null;
boolean doOomAdj = doLowMem;
if (!app.killedByAm) {
Slog.i(TAG, "Process " + app.processName + " (pid " + pid
+ ") has died");
mAllowLowerMemLevel = true;
} else {
// Note that we always want to do oom adj to update our state with the
// new number of procs.
mAllowLowerMemLevel = false;
doLowMem = false;
}
EventLog.writeEvent(EventLogTags.AM_PROC_DIED, app.userId, app.pid, app.processName);
if (DEBUG_CLEANUP) Slog.v(
TAG, "Dying app: " + app + ", pid: " + pid
+ ", thread: " + thread.asBinder());
handleAppDiedLocked(app, false, true);
if (doOomAdj) {
updateOomAdjLocked();
}
if (doLowMem) {
doLowMemReportIfNeededLocked(app);
}
} else if (app.pid != pid) {
// A new process has already been started.
Slog.i(TAG, "Process " + app.processName + " (pid " + pid
+ ") has died and restarted (pid " + app.pid + ").");
EventLog.writeEvent(EventLogTags.AM_PROC_DIED, app.userId, app.pid, app.processName);
} else if (DEBUG_PROCESSES) {
Slog.d(TAG, "Received spurious death notification for thread "
+ thread.asBinder());
}
}可以看到app.killedByAm = false，也就是说不是ActivityManager主动kill该应用，而是LowMemory的原因(for RAM)。
ProcessRecord里属性：
private final BatteryStatsImpl mBatteryStats; // where to collect runtime statistics
final ApplicationInfo info; // all about the first app in the process
final boolean isolated; // true if this is a special isolated process
final int uid; // uid of process; may be different from 'info' if isolated
final int userId; // user of process.
final String processName; // name of the process
// List of packages running in the process
final ArrayMap<String, ProcessStats.ProcessStateHolder> pkgList
= new ArrayMap<String, ProcessStats.ProcessStateHolder>();
ArraySet<String> pkgDeps; // additional packages we have a dependency on
IApplicationThread thread; // the actual proc... may be null only if
// 'persistent' is true (in which case we
// are in the process of launching the app)
ProcessStats.ProcessState baseProcessTracker;
BatteryStatsImpl.Uid.Proc curProcBatteryStats;
int pid; // The process of this application; 0 if none
int[] gids; // The gids this process was launched with
String requiredAbi; // The ABI this process was launched with
String instructionSet; // The instruction set this process was launched with
boolean starting; // True if the process is being started
long lastActivityTime; // For managing the LRU list
long lastPssTime; // Last time we retrieved PSS data
long nextPssTime; // Next time we want to request PSS data
long lastStateTime; // Last time setProcState changed
long initialIdlePss; // Initial memory pss of process for idle maintenance.
long lastPss; // Last computed memory pss.
long lastCachedPss; // Last computed pss when in cached state.
int maxAdj; // Maximum OOM adjustment for this process
int curRawAdj; // Current OOM unlimited adjustment for this process
int setRawAdj; // Last set OOM unlimited adjustment for this process
int curAdj; // Current OOM adjustment for this process
int setAdj; // Last set OOM adjustment for this process
int curSchedGroup; // Currently desired scheduling class
int setSchedGroup; // Last set to background scheduling class
int trimMemoryLevel; // Last selected memory trimming level
int curProcState = -1; // Currently computed process state: ActivityManager.PROCESS_STATE_*
int repProcState = -1; // Last reported process state
int setProcState = -1; // Last set process state in process tracker
int pssProcState = -1; // The proc state we are currently requesting pss for
boolean serviceb; // Process currently is on the service B list
boolean serviceHighRam; // We are forcing to service B list due to its RAM use
boolean setIsForeground; // Running foreground UI when last set?
boolean notCachedSinceIdle; // Has this process not been in a cached state since last idle?
boolean hasClientActivities; // Are there any client services with activities?
boolean hasStartedServices; // Are there any started services running in this process?
boolean foregroundServices; // Running any services that are foreground?
boolean foregroundActivities; // Running any activities that are foreground?
boolean repForegroundActivities; // Last reported foreground activities.
boolean systemNoUi; // This is a system process, but not currently showing UI.
boolean hasShownUi; // Has UI been shown in this process since it was started?
boolean pendingUiClean; // Want to clean up resources from showing UI?
boolean hasAboveClient; // Bound using BIND_ABOVE_CLIENT, so want to be lower
boolean treatLikeActivity; // Bound using BIND_TREAT_LIKE_ACTIVITY
boolean bad; // True if disabled in the bad process list
boolean killedByAm; // True when proc has been killed by activity manager, not for RAM
boolean killed; // True once we know the process has been killed
boolean procStateChanged; // Keep track of whether we changed 'setAdj'.
String waitingToKill; // Process is waiting to be killed when in the bg, and reason
IBinder forcingToForeground;// Token that is forcing this process to be foreground
int adjSeq; // Sequence id for identifying oom_adj assignment cycles
int lruSeq; // Sequence id for identifying LRU update cycles
CompatibilityInfo compat; // last used compatibility mode
IBinder.DeathRecipient deathRecipient; // Who is watching for the death.
ComponentName instrumentationClass;// class installed to instrument app
ApplicationInfo instrumentationInfo; // the application being instrumented
String instrumentationProfileFile; // where to save profiling
IInstrumentationWatcher instrumentationWatcher; // who is waiting
IUiAutomationConnection instrumentationUiAutomationConnection; // Connection to use the UI introspection APIs.
Bundle instrumentationArguments;// as given to us
ComponentName instrumentationResultClass;// copy of instrumentationClass
boolean usingWrapper; // Set to true when process was launched with a wrapper attached
BroadcastRecord curReceiver;// receiver currently running in the app
long lastWakeTime; // How long proc held wake lock at last check
long lastCpuTime; // How long proc has run CPU at last check
long curCpuTime; // How long proc has run CPU most recently
long lastRequestedGc; // When we last asked the app to do a gc
long lastLowMemory; // When we last told the app that memory is low
boolean reportLowMemory; // Set to true when waiting to report low mem
boolean empty; // Is this an empty background process?
boolean cached; // Is this a cached process?
String adjType; // Debugging: primary thing impacting oom_adj.
int adjTypeCode; // Debugging: adj code to report to app.
Object adjSource; // Debugging: option dependent object.
int adjSourceProcState; // Debugging: proc state of adjSource's process.
Object adjTarget; // Debugging: target component impacting oom_adj.
Runnable crashHandler; // Optional local handler to be invoked in the process crash.
过滤掉特定应用：
if (!app.killed) {
Process.killProcessQuiet(pid);
Process.killProcessGroup(app.uid, pid);
app.killed = true;
}修改为：
if (!app.killed) {
if(!"com.test.xxx".equals(app.processName)){
Process.killProcessQuiet(pid);
Process.killProcessGroup(app.uid, pid);
}
app.killed = true;
}