# Signal 11 on android after some time

**URL:** <https://forums.unrealengine.com/t/signal-11-on-android-after-some-time/457631>\
**Category:** Mobile\
**Tags:** garbage-collection, unreal-engine, crash, Android, CPP, question\
**Created:** [October 27, 2019, 4:16pm UTC](https://forums.unrealengine.com/t/signal-11-on-android-after-some-time/457631 "2019-10-27T16:16:30Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Fatorice](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Fatorice](https://forums.unrealengine.com/u/Fatorice)\
**Post date:** [October 27, 2019, 4:16pm UTC](https://forums.unrealengine.com/t/signal-11-on-android-after-some-time/457631/1 "2019-10-27T16:16:30Z")

</div>

Hello!

After the upgrade vom 4.20 to 4.22 the android release build crashes after some time. I use the VaREST and the PlayFab Plugin. Sometimes it works, when I disable one of both (but this can be luck anyways).  
I got an stacktrace:

```
Stack frame 10-26 13:32:59.041: A/DEBUG(27008): #00 pc 041550cc /data/app/de.mbpictures.endlessrunner--IHs6b__IWS88J-fF7beVA==/lib/arm/libUE4.so (_ZN12FGCArrayPool19ClearWeakReferencesEb+692): Routine FGCArrayPool::ClearWeakReferences(bool) at ??:?
Stack frame 10-26 13:32:59.041: A/DEBUG(27008): #01 pc 04154750 /data/app/de.mbpictures.endlessrunner--IHs6b__IWS88J-fF7beVA==/lib/arm/libUE4.so (_Z22CollectGarbageInternal12EObjectFlagsb+708): Routine CollectGarbageInternal(EObjectFlags, bool) at ??:?
Stack frame 10-26 13:32:59.041: A/DEBUG(27008): #02 pc 04155514 /data/app/de.mbpictures.endlessrunner--IHs6b__IWS88J-fF7beVA==/lib/arm/libUE4.so (_Z17TryCollectGarbage12EObjectFlagsb+252): Routine TryCollectGarbage(EObjectFlags, bool) at ??:?
Stack frame 10-26 13:32:59.041: A/DEBUG(27008): #03 pc 057da678 /data/app/de.mbpictures.endlessrunner--IHs6b__IWS88J-fF7beVA==/lib/arm/libUE4.so (_ZN7UEngine25ConditionalCollectGarbageEv+488): Routine UEngine::ConditionalCollectGarbage() at ??:?
Stack frame 10-26 13:32:59.041: A/DEBUG(27008): #04 pc 053d2f70 /data/app/de.mbpictures.endlessrunner--IHs6b__IWS88J-fF7beVA==/lib/arm/libUE4.so (_ZN6UWorld4TickE10ELevelTickf+2864): Routine $a.632 at D:/Build/++UE4/Sync/Engine/Intermediate/Build/Android/UE4/Shipping/Engine/Module.Engine.21_of_43.cpp:?
Stack frame 10-26 13:32:59.041: A/DEBUG(27008): #05 pc 052d5938 /data/app/de.mbpictures.endlessrunner--IHs6b__IWS88J-fF7beVA==/lib/arm/libUE4.so (_ZN11UGameEngine4TickEfb+872): Routine UGameEngine::Tick(float, bool) at ??:?
Stack frame 10-26 13:32:59.041: A/DEBUG(27008): #06 pc 03218e90 /data/app/de.mbpictures.endlessrunner--IHs6b__IWS88J-fF7beVA==/lib/arm/libUE4.so (_ZN11FEngineLoop4TickEv+4736): Routine $a.486 at D:/Build/++UE4/Sync/Engine/Intermediate/Build/Android/UE4/Shipping/Launch/Module.Launch.cpp:?
Stack frame 10-26 13:32:59.042: A/DEBUG(27008): #07 pc 03216410 /data/app/de.mbpictures.endlessrunner--IHs6b__IWS88J-fF7beVA==/lib/arm/libUE4.so (_Z11AndroidMainP11android_app+3444): Routine AndroidMain(android_app*) at ??:?
Stack frame 10-26 13:32:59.042: A/DEBUG(27008): #08 pc 0321a7f4 /data/app/de.mbpictures.endlessrunner--IHs6b__IWS88J-fF7beVA==/lib/arm/libUE4.so (android_main+120): Routine android_main at ??:?
Stack frame 10-26 13:32:59.042: A/DEBUG(27008): #09 pc 0322f6c4 /data/app/de.mbpictures.endlessrunner--IHs6b__IWS88J-fF7beVA==/lib/arm/libUE4.so: Routine android_app_entry at D:/Build/AutoSDK/HostWin64/Android/-22/android-ndk-r14b/sources/android/native_app_glue/android_native_app_glue.c:?
Stack frame 10-26 13:32:59.042: A/DEBUG(27008): #10 pc 00048a89 /system/lib/libc.so (_ZL15__pthread_startPv+24)
Stack frame 10-26 13:32:59.042: A/DEBUG(27008): #11 pc 0001b34f /system/lib/libc.so (__start_thread+32)

```

But I can’t find out, what the actual problem is. I hope, you guys can point me towards the right direction? My Project is a blueprint project (with one C++ class) and I don’t have any class derived from UWorldObject.

Thank you already for your help!  
Best regards from Germany.