[Android] Platform.SetPageInternal NullReferenceException

[paleicikas]

MOST AFFECTED OS

SDK 23: 29.4%
SDK 24: 23.5%
SDK 26: 23.5%
SDK 19: 11.8%
Others:11.8%

Xamarin Exception Stack:
System.NullReferenceException: Object reference not set to an instance of an object
  at Xamarin.Forms.Platform.Android.AppCompat.Platform.SetPageInternal (Xamarin.Forms.Page newRoot) [0x0003f] in <6b73296523894c3d8d57f5a8e3480a43>:0
  at Xamarin.Forms.Platform.Android.AppCompat.Platform+<>c__DisplayClass36_0.b__0 () [0x0001f] in <6b73296523894c3d8d57f5a8e3480a43>:0
  at Java.Lang.Thread+RunnableImplementor.Run () [0x00008] in <263adecfa58f4c449f1ff56156d886fd>:0
  at Java.Lang.IRunnableInvoker.n_Run (System.IntPtr jnienv, System.IntPtr native__this) [0x00008] in <263adecfa58f4c449f1ff56156d886fd>:0
  at (wrapper dynamic-method) System.Object.e167ca66-2f84-447f-ae7a-782f20614f96(intptr,intptr)

Thread 2:
0   dalvik.system.VMStack.getThreadStackTrace(VMStack.java:-2)
1   java.lang.Thread.getStackTrace(Thread.java:1536)
2   java.lang.Thread.getAllStackTraces(Thread.java:1586)
3   com.microsoft.appcenter.crashes.Crashes.saveUncaughtException(Crashes.java:923)
4   com.microsoft.appcenter.crashes.WrapperSdkExceptionManager.saveWrapperException(WrapperSdkExceptionManager.java:50)
5   mono.java.lang.RunnableImplementor.n_run(RunnableImplementor.java:-2)
6   mono.java.lang.RunnableImplementor.run(RunnableImplementor.java:30)
7   android.os.Handler.handleCallback(Handler.java:789)
8   android.os.Handler.dispatchMessage(Handler.java:98)
9   android.os.Looper.loop(Looper.java:164)
10  android.app.ActivityThread.main(ActivityThread.java:6938)
11  java.lang.reflect.Method.invoke(Method.java:-2)
12  com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
13  com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)

Thread 4170:
0   java.lang.Object.wait(Object.java:-2)
1   java.lang.Daemons$ReferenceQueueDaemon.runInternal(Daemons.java:178)
2   java.lang.Daemons$Daemon.run(Daemons.java:103)
3   java.lang.Thread.run(Thread.java:764)

Thread 4171:
0   java.lang.Object.wait(Object.java:-2)
1   java.lang.Object.wait(Object.java:422)
2   java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:188)
3   java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:209)
4   java.lang.Daemons$FinalizerDaemon.runInternal(Daemons.java:232)
5   java.lang.Daemons$Daemon.run(Daemons.java:103)
6   java.lang.Thread.run(Thread.java:764)

Thread 4172:
0   java.lang.Thread.sleep(Thread.java:-2)
1   java.lang.Thread.sleep(Thread.java:373)
2   java.lang.Thread.sleep(Thread.java:314)
3   java.lang.Daemons$FinalizerWatchdogDaemon.sleepFor(Daemons.java:342)
4   java.lang.Daemons$FinalizerWatchdogDaemon.waitForFinalization(Daemons.java:364)
5   java.lang.Daemons$FinalizerWatchdogDaemon.runInternal(Daemons.java:281)
6   java.lang.Daemons$Daemon.run(Daemons.java:103)
7   java.lang.Thread.run(Thread.java:764)

Thread 4186:
0   android.os.MessageQueue.nativePollOnce(MessageQueue.java:-2)
1   android.os.MessageQueue.next(MessageQueue.java:325)
2   android.os.Looper.loop(Looper.java:142)
3   android.os.HandlerThread.run(HandlerThread.java:65)

Thread 4193:
0   android.os.MessageQueue.nativePollOnce(MessageQueue.java:-2)
1   android.os.MessageQueue.next(MessageQueue.java:325)
2   android.os.Looper.loop(Looper.java:142)
3   android.os.HandlerThread.run(HandlerThread.java:65)

Thread 4195:
0   android.os.MessageQueue.nativePollOnce(MessageQueue.java:-2)
1   android.os.MessageQueue.next(MessageQueue.java:325)
2   android.os.Looper.loop(Looper.java:142)
3   android.os.HandlerThread.run(HandlerThread.java:65)

Thread 4212:
0   android.os.MessageQueue.nativePollOnce(MessageQueue.java:-2)
1   android.os.MessageQueue.next(MessageQueue.java:325)
2   android.os.Looper.loop(Looper.java:142)
3   android.os.HandlerThread.run(HandlerThread.java:65)

Thread 4214:
0   android.os.MessageQueue.nativePollOnce(MessageQueue.java:-2)
1   android.os.MessageQueue.next(MessageQueue.java:325)
2   android.os.Looper.loop(Looper.java:142)
3   android.os.HandlerThread.run(HandlerThread.java:65)

Thread 4222:
0   java.lang.Object.wait(Object.java:-2)
1   java.lang.Thread.parkFor$(Thread.java:2135)
2   sun.misc.Unsafe.park(Unsafe.java:358)
3   java.util.concurrent.locks.LockSupport.park(LockSupport.java:190)
4   java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2059)
5   java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
6   java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1087)
7   java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1147)
8   java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
9   KE.run
10  java.lang.Thread.run(Thread.java:764)

Thread 4226:
0   java.lang.Object.wait(Object.java:-2)
1   com.android.okhttp.okio.AsyncTimeout.awaitTimeout(AsyncTimeout.java:323)
2   com.android.okhttp.okio.AsyncTimeout.-wrap0
3   com.android.okhttp.okio.AsyncTimeout$Watchdog.run(AsyncTimeout.java:286)

Thread 4227:
0   java.lang.Object.wait(Object.java:-2)
1   java.lang.Thread.parkFor$(Thread.java:2135)
2   sun.misc.Unsafe.park(Unsafe.java:358)
3   java.util.concurrent.locks.LockSupport.park(LockSupport.java:190)
4   java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2059)
5   java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
6   java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1087)
7   java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1147)
8   java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
9   KE.run
10  java.lang.Thread.run(Thread.java:764)

Thread 4251:
0   java.lang.Object.wait(Object.java:-2)
1   java.lang.Thread.parkFor$(Thread.java:2135)
2   sun.misc.Unsafe.park(Unsafe.java:358)
3   java.util.concurrent.locks.LockSupport.park(LockSupport.java:190)
4   java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2059)
5   java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
6   java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1087)
7   java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1147)
8   java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
9   java.lang.Thread.run(Thread.java:764)

Thread 4297:
0   java.lang.Object.wait(Object.java:-2)
1   java.lang.Object.wait(Object.java:422)
2   java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:188)
3   java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:209)
4   agA.run(SourceFile:3)

Thread 4334:
0   java.lang.Object.wait(Object.java:-2)
1   com.android.okhttp.ConnectionPool$1.run(ConnectionPool.java:101)
2   java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
3   java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
4   java.lang.Thread.run(Thread.java:764)

---

No code to reproduce
Latest XF

[kingces95]

The offset 0x0003f in

Xamarin.Forms.Platform.Android.AppCompat.Platform.SetPageInternal (Xamarin.Forms.Page newRoot) [0x0003f]

Maps to this Dispose call.

[kingces95]

Team is undecided on whether to revert PR until we have a reproduction or submit fix as it's likely to unblock customer. So if you could provide a repro, that would certainly expedite the fix as well as allow us to ensure it's the right fix.