Android6.0 Disk I/O error

Android6.0 使用过程中遇到无法开机，宕机在开机动画中，error log：

04-01 02:06:38.213 E/AndroidRuntime(  864): *** FATAL EXCEPTION IN SYSTEM PROCESS: main04-01 02:06:38.213 E/AndroidRuntime(  864): java.lang.RuntimeException: Failed to boot service com.android.server.devicepolicy.DevicePolicyManagerService$Lifecycle: onBootPhase threw an exception during phase 48004-01 02:06:38.213 E/AndroidRuntime(  864):     at com.android.server.SystemServiceManager.startBootPhase(SystemServiceManager.java:137)04-01 02:06:38.213 E/AndroidRuntime(  864):     at com.android.server.SystemServer.startOtherServices(SystemServer.java:1043)04-01 02:06:38.213 E/AndroidRuntime(  864):     at com.android.server.SystemServer.run(SystemServer.java:272)04-01 02:06:38.213 E/AndroidRuntime(  864):     at com.android.server.SystemServer.main(SystemServer.java:170)04-01 02:06:38.213 E/AndroidRuntime(  864):     at java.lang.reflect.Method.invoke(Native Method)04-01 02:06:38.213 E/AndroidRuntime(  864):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)04-01 02:06:38.213 E/AndroidRuntime(  864):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)04-01 02:06:38.213 E/AndroidRuntime(  864): Caused by: android.database.sqlite.SQLiteDiskIOException: disk I/O error (code 4874)04-01 02:06:38.213 E/AndroidRuntime(  864):     at android.database.sqlite.SQLiteConnection.nativeExecuteForLong(Native Method)04-01 02:06:38.213 E/AndroidRuntime(  864):     at android.database.sqlite.SQLiteConnection.executeForLong(SQLiteConnection.java:596)04-01 02:06:38.213 E/AndroidRuntime(  864):     at android.database.sqlite.SQLiteSession.executeForLong(SQLiteSession.java:652)04-01 02:06:38.213 E/AndroidRuntime(  864):     at android.database.sqlite.SQLiteStatement.simpleQueryForLong(SQLiteStatement.java:107)04-01 02:06:38.213 E/AndroidRuntime(  864):     at android.database.DatabaseUtils.longForQuery(DatabaseUtils.java:845)04-01 02:06:38.213 E/AndroidRuntime(  864):     at android.database.DatabaseUtils.longForQuery(DatabaseUtils.java:833)04-01 02:06:38.213 E/AndroidRuntime(  864):     at android.database.sqlite.SQLiteDatabase.getVersion(SQLiteDatabase.java:864)04-01 02:06:38.213 E/AndroidRuntime(  864):     at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:241)04-01 02:06:38.213 E/AndroidRuntime(  864):     at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:187)04-01 02:06:38.213 E/AndroidRuntime(  864):     at com.android.server.LockSettingsStorage.readKeyValue(LockSettingsStorage.java:138)04-01 02:06:38.213 E/AndroidRuntime(  864):     at com.android.server.LockSettingsService.getStringUnchecked(LockSettingsService.java:359)04-01 02:06:38.213 E/AndroidRuntime(  864):     at com.android.server.LockSettingsService.getLong(LockSettingsService.java:338)04-01 02:06:38.213 E/AndroidRuntime(  864):     at com.android.internal.widget.LockPatternUtils.getLong(LockPatternUtils.java:1123)04-01 02:06:38.213 E/AndroidRuntime(  864):     at com.android.internal.widget.LockPatternUtils.getKeyguardStoredPasswordQuality(LockPatternUtils.java:841)04-01 02:06:38.213 E/AndroidRuntime(  864):     at com.android.internal.widget.LockPatternUtils.getActivePasswordQuality(LockPatternUtils.java:427)04-01 02:06:38.213 E/AndroidRuntime(  864):     at com.android.server.devicepolicy.DevicePolicyManagerService.loadSettingsLocked(DevicePolicyManagerService.java:1673)04-01 02:06:38.213 E/AndroidRuntime(  864):     at com.android.server.devicepolicy.DevicePolicyManagerService.getUserData(DevicePolicyManagerService.java:1091)04-01 02:06:38.213 E/AndroidRuntime(  864):     at com.android.server.devicepolicy.DevicePolicyManagerService.systemReady(DevicePolicyManagerService.java:1785)04-01 02:06:38.213 E/AndroidRuntime(  864):     at com.android.server.devicepolicy.DevicePolicyManagerService$Lifecycle.onBootPhase(DevicePolicyManagerService.java:308)04-01 02:06:38.213 E/AndroidRuntime(  864):     at com.android.server.SystemServiceManager.startBootPhase(SystemServiceManager.java:135)04-01 02:06:38.213 E/AndroidRuntime(  864):     ... 6 more

主要错误是 Disk I/O error，查看data分区的size：

1|root@hhhh:/ # df                                                             Filesystem               Size     Used     Free   Blksize/dev                   436.5M    96.0K   436.4M   4096/sys/fs/cgroup         436.5M    12.0K   436.5M   4096/mnt                   436.5M     0.0K   436.5M   4096/system                  1.2G   543.6M   646.7M   4096/data                    4.8G     4.8G    16.0M   4096/cache                 248.0M   156.0K   247.8M   4096/oem                    59.0M    40.0K    58.9M   4096/Reserved              484.3M   384.0K   483.9M   4096/persist                27.5M   180.0K    27.3M   4096/firmware               64.0M    17.9M    46.1M   16384/storage               436.5M     0.0K   436.5M   4096

发现data分区已经被塞满了，查看是哪些文件太多，删除一些，腾出空间，reboot device后，可以正常开机。