I received a crash dump from an ARM64 Mac. I see my code here but from what I can tell it looks like this "crash" occurred during cleanup/quit. One thing that caught my eye here is the symbol __A_WATCHDOG_TIMEOUT_HAS_OCCURRED__ that shows up just before exit. Does this mean the watchdog timeout initiated exit? Can I determine why? Crashed Thread: 13 Exception Type: EXC_BREAKPOINT (SIGTRAP) Exception Codes: 0x0000000000000001, 0x000000019c61427c Termination Reason: Namespace SIGNAL, Code 5 Trace/BPT trap: 5 Terminating Process: exc handler [60432] ... Thread 13 Crashed: 0 FrontBoardServices 0x000000019c61427c -[FBSMainRunLoopSerialQueue assertBarrierOnQueue] + 144 (FBSSerialQueue.m:264) 1 FrontBoardServices 0x000000019c5ca91c -[FBSScene detachLayer:] + 44 (FBSScene.m:222) 2 UIKitCore 0x00000001b59c0538 -[_UIFBSSceneSubstrate detachContext:] + 92 (_UIFBSSceneSubstrate.m:74) 3 UIKitCore 0x00000001b5569168 __UIContextBinderDetachContext + 240 (_UIContextBinder.m:367) 4 UIKitCore 0x00000001b5569014 -[_UIContextBinder detachBindable:] + 192 (_UIContextBinder.m:149) 5 UIKitCore 0x00000001b5568ed0 -[UIWindowScene _windowUpdatedVisibility:] + 84 (UIWindowScene.m:1162) 6 UIKitCore 0x00000001b5568d38 -[UIWindow _updateLayerOrderingAndSetLayerHidden:actionBlock:] + 192 (UIWindow.m:2330) 7 UIKitCore 0x00000001b55b9ae8 -[UIWindow _setHidden:forced:] + 104 (UIWindow.m:2556) 8 SDL2 0x00000001026ccb6c 0x102660000 + 445292 9 SDL2 0x0000000102713828 SDL_DestroyWindow + 164 10 My App 0x0000000102073890 cleanup + 60 (init.c:129) 11 libsystem_c.dylib 0x0000000186ddcfa8 __cxa_finalize_ranges + 492 (atexit.c:292) 12 libsystem_c.dylib 0x0000000186ddcd20 exit + 44 (exit.c:78) 13 UIKitMacHelper 0x000000019fbb60ec __A_WATCHDOG_TIMEOUT_HAS_OCCURRED__ + 192 (UINSLifecycleWatchdog.m:35) 14 UIKitMacHelper 0x000000019fbb487c __60-[UINSLifecycleWatchdog initWithStateIdentifier:andTimeout:]_block_invoke + 1160 (UINSLifecycleWatchdog.m:77) 15 UIKitMacHelper 0x000000019fbb5828 run_watchdog_thread + 276 (UINSLifecycleWatchdog.m:305) 16 libsystem_pthread.dylib 0x0000000186f1d034 _pthread_start + 136 (pthread.c:904) 17 libsystem_pthread.dylib 0x0000000186f17e3c thread_start + 8 (:-1)