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：

- ::40.453   I ActivityManager: Process com.test.xxx (pid ) has died
- ::40.453   D ActivityManager: SVC-handleAppDiedLocked: app = ProcessRecord{19911aa7 :com.test.xxx/u0a41}, app.pid =
- ::40.453   D ActivityManager: SVC-mBroadcastQueues: com.android.server.am.BroadcastQueue@260b97c9
- ::40.453   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 = -;      // Currently computed process state: ActivityManager.PROCESS_STATE_*
    int repProcState = -;      // Last reported process state
    int setProcState = -;      // Last set process state in process tracker
    int pssProcState = -;      // 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;
        }

原文：http://blog.csdn.net/zhoumushui https://blog.csdn.net/zhoumushui/article/details/52239884