[Xperia Tablet Z Q&A, Help & Troubleshooting] Walter_White:
OK, so I have just used the v13 version of Doomlords Rooting Toolkit t root my SP311 on a ...370 firmware.

It all went through relatively smooth, however I am now experiencing problems with a lot of sudden reboots. I am just trying to tackle this, bear with me...

- when I installed AdAway first thing after rooting it asked for root privileges alright, then downloaded the hosts files, but when it came to writing / updating the systems own hosts file the device rebooted, no bells and whistles or errors, just click and gone. this also happened the 2nd time around

- after that I wanted to have a closer look and ran ES File Explorers root functions, telling it to mount / R/W. Seconds after performing this action the tablet cycled again.

I then checked the still open doomlord output and found it had 2 problems during execution. One was related to the RIC layer and I disregard this as I assume it is some kind of radio-related thing (which would naturally not be present on a WIFI-only device).

--- Remounting rootfs
--- Killing RIC service (specific for new Xperia devices)
Unable to chmod /system/bin/ric: No such file or directory
--- Installing busybox

The next one is superuser related:

--- Remounting /system
--- copying busybox to /system/xbin/
1666+1 records in
1666+1 records out
853044 bytes transferred in 0.047 secs (18149872 bytes/sec)
--- correcting ownership
--- correcting permissions
--- installing busybox
--- pushing SU binary
rm failed for /system/xbin/su, No such file or directory
188+1 records in
188+1 records out
96260 bytes transferred in 0.006 secs (16043333 bytes/sec)
--- correcting ownership
--- correcting permissions
--- correcting symlinks
rm failed for /system/bin/su, No such file or directory
--- pushing Superuser app

So, could this be the source of my problems? From what I gather it failed to replace the native su binary with the supplied 3rd party version? How would I go about manually changing / adding it and replacing the links to the bin and xbin paths?

Or is there any other suggestion on what to try?

I did an attempt at logging what happens right before the power cycle, here is the log. Not sure if anyone can make head or tails of it, and not even sure if the actual problem is even recorded. It might just b0rk so fast that catlog can't write the log buffer to flash anymore...

06-23 22:16:28.140 E/ANDR-PERF-MPCTL( 569): MPCTL client send 2
06-23 22:16:28.140 E/ANDR-PERF-MPCTL( 1235): Received len=92, m=1297100099, v=2, c=569, s=10, m=1555130400 (0x5cb16820) d=5
06-23 22:16:28.140 I/ActivityManager( 569): START {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 pkg=com.estrongs.android.pop cmp=com.estrongs.android.pop/.view.FileExplorerActivity bnds=[487,613][637,763] u=0} from pid 928
06-23 22:16:28.150 E/ANDR-PERF-MPCTL( 1235): CPU0 min freq set to 1512000
06-23 22:16:28.150 E/ANDR-PERF-MPCTL( 1235): CPU1 min freq set to 1512000
06-23 22:16:28.150 E/ANDR-PERF-MPCTL( 1235): CPU1 min freq set to 1512000
06-23 22:16:28.150 E/ANDR-PERF-MPCTL( 1235): CPU1 min freq set to 1512000
06-23 22:16:28.160 D/PowerManagerService( 569): acquireWakeLock flags=0x1 tag=ActivityManager-Launch
06-23 22:16:28.191 I/ActivityManager( 569): Start proc com.estrongs.android.pop for activity com.estrongs.android.pop/.view.FileExplorerActivity: pid=3352 uid=10196 gids={3003, 3002, 3001, 1015, 1028}
06-23 22:16:28.221 E/Trace ( 3352): error opening trace file: No such file or directory (2)
06-23 22:16:28.221 D/ActivityThread( 3352): setTargetHeapUtilization:0.25
06-23 22:16:28.221 D/ActivityThread( 3352): setTargetHeapIdealFree:8388608
06-23 22:16:28.221 D/ActivityThread( 3352): setTargetHeapConcurrentStart:2097152
06-23 22:16:28.271 I/Adreno200-C2D( 928): <c2d_driver_deinit:77>: C2D2 De-Init A3xx version
06-23 22:16:28.271 I/Adreno200-C2D( 928): <c2d_cmd_res_deinit:157>: GPU DeAllocated Address 0x68803000 0x1009a000
06-23 22:16:28.291 E/hwcomposer( 282): void qhwc::QueuedBufferStore::unlockBuffer(private_handle_t*) Invalid Handle
06-23 22:16:28.321 I/ActivityThread( 3352): Pub com.estrongs.files: com.estrongs.android.pop.app.FileContentProvider
06-23 22:16:28.341 W/System.err( 3352): java.lang.NoSuchMethodException: setCompatibilityInfo [class android.content.res.CompatibilityInfo$1]
06-23 22:16:28.341 W/System.err( 3352):	at java.lang.Class.getConstructorOrMethod(Class.java:460)
06-23 22:16:28.341 W/System.err( 3352):	at java.lang.Class.getMethod(Class.java:915)
06-23 22:16:28.341 W/System.err( 3352):	at com.estrongs.android.util.ae.a(Unknown Source)
06-23 22:16:28.341 W/System.err( 3352):	at com.estrongs.android.util.ae.a(Unknown Source)
06-23 22:16:28.341 W/System.err( 3352):	at com.estrongs.android.pop.esclasses.h.<init>(Unknown Source)
06-23 22:16:28.341 W/System.err( 3352):	at com.estrongs.android.pop.esclasses.h.a(Unknown Source)
06-23 22:16:28.341 W/System.err( 3352):	at com.estrongs.android.pop.FexApplication.getResources(Unknown Source)
06-23 22:16:28.341 W/System.err( 3352):	at com.estrongs.android.ui.b.a.a(Unknown Source)
06-23 22:16:28.341 W/System.err( 3352):	at com.estrongs.android.pop.FexApplication.onCreate(Unknown Source)
06-23 22:16:28.341 W/System.err( 3352):	at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:999)
06-23 22:16:28.341 W/System.err( 3352):	at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4197)
06-23 22:16:28.341 W/System.err( 3352):	at android.app.ActivityThread.access$1300(ActivityThread.java:137)
06-23 22:16:28.341 W/System.err( 3352):	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1266)
06-23 22:16:28.341 W/System.err( 3352):	at android.os.Handler.dispatchMessage(Handler.java:99)
06-23 22:16:28.341 W/System.err( 3352):	at android.os.Looper.loop(Looper.java:213)
06-23 22:16:28.341 W/System.err( 3352):	at android.app.ActivityThread.main(ActivityThread.java:4791)
06-23 22:16:28.341 W/System.err( 3352):	at java.lang.reflect.Method.invokeNative(Native Method)
06-23 22:16:28.341 W/System.err( 3352):	at java.lang.reflect.Method.invoke(Method.java:511)
06-23 22:16:28.341 W/System.err( 3352):	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
06-23 22:16:28.341 W/System.err( 3352):	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
06-23 22:16:28.341 W/System.err( 3352):	at dalvik.system.NativeStart.main(Native Method)
06-23 22:16:28.351 E/ObjectHelper( 3352): Can't find method:setCompatibilityInfo
06-23 22:16:28.431 D/j ( 3352): OEC Config file not found
06-23 22:16:28.441 W/ResourceType( 3352): No package identifier when getting value for resource number 0x00000000
06-23 22:16:28.441 W/ResourceType( 3352): No package identifier when getting value for resource number 0x00000000
06-23 22:16:28.451 W/ResourceType( 3352): No package identifier when getting value for resource number 0x00000000
06-23 22:16:28.451 W/ResourceType( 3352): No package identifier when getting value for resource number 0x00000000
06-23 22:16:28.451 W/ResourceType( 3352): No package identifier when getting value for resource number 0x00000000
06-23 22:16:28.451 W/ResourceType( 3352): No package identifier when getting value for resource number 0x00000000
06-23 22:16:28.481 W/ResourceType( 3352): No package identifier when getting value for resource number 0x00000000
06-23 22:16:28.611 W/ResourceType( 3352): No package identifier when getting value for resource number 0x00000000
06-23 22:16:28.611 W/ResourceType( 3352): No package identifier when getting value for resource number 0x00000000
06-23 22:16:28.621 D/StateMachine( 569): handleMessage: E msg.what=131155
06-23 22:16:28.621 D/StateMachine( 569): processMsg: ConnectedState
06-23 22:16:28.621 D/WifiStateMachine( 569): ConnectedState{ what=131155 when=-2ms arg1=3 }
06-23 22:16:28.621 D/StateMachine( 569): processMsg: L2ConnectedState
06-23 22:16:28.621 D/WifiStateMachine( 569): L2ConnectedState{ what=131155 when=-2ms arg1=3 }
06-23 22:16:28.621 W/ResourceType( 3352): No package identifier when getting value for resource number 0x00000000
06-23 22:16:28.621 D/StateMachine( 569): handleMessage: X
06-23 22:16:28.881 I/Adreno200-EGL( 3352): <qeglDrvAPI_eglInitialize:269>: EGL 1.4 QUALCOMM build: (CL3050818)
06-23 22:16:28.881 I/Adreno200-EGL( 3352): Build Date: 01/18/13 Fri
06-23 22:16:28.881 I/Adreno200-EGL( 3352): Local Branch: final_sony_post_CS7
06-23 22:16:28.881 I/Adreno200-EGL( 3352): Remote Branch:
06-23 22:16:28.881 I/Adreno200-EGL( 3352): Local Patches: