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Hi, In our application we are facing lot of watchdog crashes after iOS 15 rollout. We are not able to identify the root cause for most of these crashes which are happening from applicationWillTerminate. Can someone please check the attached crash reports and lets us know how to identify the root cause for these crashes and then how to fix them? 0 libsystem_kernel.dylib 0x00000001e0959f24 __psynch_cvwait + 8 1 libsystem_pthread.dylib 0x000000021a68f298 _pthread_cond_wait + 1236 (pthread_cond.c:636) 2 UnityFramework 0x0000000107c2922c il2cpp::os::posix::PosixWaitObject::Wait(unsigned int, bool) + 25334316 (PosixWaitObject.cpp:120) 3 UnityFramework 0x0000000107c1fd3c il2cpp::os::Thread::Join() + 25296188 (Thread.cpp:207) 4 UnityFramework 0x0000000107c4575c il2cpp::vm::Thread::KillAllBackgroundThreadsAndWaitForForegroundThreads() + 25450332 (Thread.cpp:315) 5 UnityFramework 0x0000000107c4f820 il2cpp::vm::Runtime::Shutdown() + 25491488 (Runtime.cpp:395) 6 UnityFramework 0x0000000107576f34 CleanupIl2Cpp + 18313012 (MonoManager_Il2Cpp.cpp:296) 7 UnityFramework 0x00000001074a7afc PlayerCleanup + 17464060 (Player.cpp:627) 8 UnityFramework 0x000000010777a358 UnityCleanup + 20423512 (LibEntryPoint.mm:220) 9 UnityFramework 0x0000000106416540 -[UnityAppController applicationWillTerminate:] + 91456 (UnityAppController.mm:856) 10 UIKitCore 0x00000001ac1cab48 -[UIApplication _terminateWithStatus:] + 244 (UIApplication.m:6948) 11 UIKitCore 0x00000001ab8a6900 -[_UISceneLifecycleMultiplexer _evalTransitionToSettings:fromSettings:forceExit:withTransitionStore:] + 128 (_UISceneLifecycleMultiplexer.m:806) 12 UIKitCore 0x00000001aba9c3f8 -[_UISceneLifecycleMultiplexer forceExitWithTransitionContext:scene:] + 224 (_UISceneLifecycleMultiplexer.m:480) 13 UIKitCore 0x00000001ac1c6ec4 -[UIApplication workspaceShouldExit:withTransitionContext:] + 224 (UIApplication.m:3846) 14 FrontBoardServices 0x00000001bb036fec __63-[FBSWorkspaceScenesClient willTerminateWithTransitionContext:]_block_invoke_2 + 80 (FBSWorkspaceScenesClient.m:331) 15 FrontBoardServices 0x00000001baff2308 -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:] + 240 (FBSWorkspace.m:352) 16 FrontBoardServices 0x00000001bb036f84 __63-[FBSWorkspaceScenesClient willTerminateWithTransitionContext:]_block_invoke + 132 (FBSWorkspaceScenesClient.m:328) 17 libdispatch.dylib 0x00000001a8af4a30 _dispatch_client_callout + 20 (object.m:560) 18 libdispatch.dylib 0x00000001a8af84e0 _dispatch_block_invoke_direct + 264 (queue.c:501) 19 FrontBoardServices 0x00000001baff3c70 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 48 (FBSSerialQueue.m:157) 20 FrontBoardServices 0x00000001baff3040 -[FBSSerialQueue _targetQueue_performNextIfPossible] + 220 (FBSSerialQueue.m:181) 21 FrontBoardServices 0x00000001baff7700 -[FBSSerialQueue _performNextFromRunLoopSource] + 28 (FBSSerialQueue.m:194) 22 CoreFoundation 0x00000001a8eaf414 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28 (CFRunLoop.c:1972) 23 CoreFoundation 0x00000001a8ec01a0 __CFRunLoopDoSource0 + 208 (CFRunLoop.c:2016) 24 CoreFoundation 0x00000001a8df96f8 __CFRunLoopDoSources0 + 368 (CFRunLoop.c:2061) Thread 0 name: Thread 0 Crashed: 0 libsystem_kernel.dylib 0x000000020c5aaf64 __psynch_cvwait + 8 1 libsystem_pthread.dylib 0x0000000245bcd2c4 _pthread_cond_wait + 1280 (pthread_cond.c:640) 2 UnityFramework 0x00000001053551cc il2cpp::os::posix::PosixWaitObject::Wait(unsigned int, bool) + 25334220 (PosixWaitObject.cpp:153) 3 UnityFramework 0x000000010534bd64 il2cpp::os::Thread::Join(unsigned int) + 25296228 (Thread.cpp:216) 4 UnityFramework 0x00000001053721ac il2cpp::vm::Thread::Stop(Il2CppInternalThread*) + 25452972 (Thread.cpp:782) 5 UnityFramework 0x0000000105393568 threadpool_ms_cleanup() + 25589096 (threadpool-ms.cpp:691) 6 UnityFramework 0x000000010537b81c il2cpp::vm::Runtime::Shutdown() + 25491484 (Runtime.cpp:393) 7 UnityFramework 0x0000000104ca2f34 CleanupIl2Cpp + 18313012 (MonoManager_Il2Cpp.cpp:296) 8 UnityFramework 0x0000000104bd3afc PlayerCleanup + 17464060 (Player.cpp:627) 9 UnityFramework 0x0000000104ea6358 UnityCleanup + 20423512 (LibEntryPoint.mm:220) 10 UnityFramework 0x0000000103b42540 -[UnityAppController applicationWillTerminate:] + 91456 (UnityAppController.mm:856) 11 UIKitCore 0x00000001d7f72cf0 -[UIApplication _terminateWithStatus:] + 244 (UIApplication.m:6948) 12 UIKitCore 0x00000001d764ed20 -[_UISceneLifecycleMultiplexer _evalTransitionToSettings:fromSettings:forceExit:withTransitionStore:] + 128 (_UISceneLifecycleMultiplexer.m:806) 13 UIKitCore 0x00000001d7844528 -[_UISceneLifecycleMultiplexer forceExitWithTransitionContext:scene:] + 224 (_UISceneLifecycleMultiplexer.m:480) 14 UIKitCore 0x00000001d7f6f06c -[UIApplication workspaceShouldExit:withTransitionContext:] + 224 (UIApplication.m:3846) 15 FrontBoardServices 0x00000001e6de5fec __63-[FBSWorkspaceScenesClient willTerminateWithTransitionContext:]_block_invoke_2 + 80 (FBSWorkspaceScenesClient.m:331) 16 FrontBoardServices 0x00000001e6da1308 -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:] + 240 (FBSWorkspace.m:352) 17 FrontBoardServices 0x00000001e6de5f84 __63-[FBSWorkspaceScenesClient willTerminateWithTransitionContext:]_block_invoke + 132 (FBSWorkspaceScenesClient.m:328) 18 libdispatch.dylib 0x00000001d48a8a2c _dispatch_client_callout + 20 (object.m:560) 19 libdispatch.dylib 0x00000001d48ac4e0 _dispatch_block_invoke_direct + 264 (queue.c:501) 20 FrontBoardServices 0x00000001e6da2c70 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 48 (FBSSerialQueue.m:157) 21 FrontBoardServices 0x00000001e6da2040 -[FBSSerialQueue _targetQueue_performNextIfPossible] + 220 (FBSSerialQueue.m:181) 22 FrontBoardServices 0x00000001e6da6700 -[FBSSerialQueue _performNextFromRunLoopSource] + 28 (FBSSerialQueue.m:194) 23 CoreFoundation 0x00000001d4c63f04 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28 (CFRunLoop.c:1972) 24 CoreFoundation 0x00000001d4c74c90 __CFRunLoopDoSource0 + 208 (CFRunLoop.c:2016) Regards, Eshwar threadpool.crash KillAllBackgroundThreadsAndWaitForForegroundThreads.crash

We are seeing significant increase in crashes in iOS 15. Most of the crashes are from UIKitCore. As of now we are not able to reproduce the issue. Can someone point out what could be causing these high number of crashes in iOS 15? Thread 0 name: Thread 0 Crashed: 0 libsystem_kernel.dylib 0x00000001ba964014 __psynch_cvwait + 8 1 libsystem_pthread.dylib 0x00000001f339f20c _pthread_cond_wait + 1236 (pthread_cond.c:636) 2 XYZ 0x0000000105c2b338 il2cpp::os::posix::PosixWaitObject::Wait(unsigned int, bool) + 328 (PosixWaitObject.cpp:125) 3 XYZ 0x0000000105c227f0 il2cpp::os::Event::Wait(unsigned int, bool) + 16 (Event.cpp:44) 4 XYZ 0x0000000105c227f0 il2cpp::os::Thread::Join(unsigned int) + 16 (Thread.cpp:209) 5 XYZ 0x0000000105c227f0 il2cpp::os::Thread::Join() + 24 (Thread.cpp:203) 6 XYZ 0x0000000105c42b40 il2cpp::vm::Thread::KillAllBackgroundThreadsAndWaitForForegroundThreads() + 516 (Thread.cpp:316) 7 XYZ 0x0000000105c4b998 il2cpp::vm::Runtime::Shutdown() + 76 (Runtime.cpp:426) 8 XYZ 0x00000001053a995c CleanupIl2Cpp() + 20 (MonoManager_Il2Cpp.cpp:276) 9 XYZ 0x0000000105301d80 PlayerCleanup(bool) + 84 (Player.cpp:627) 10 XYZ 0x00000001055ec264 UnityCleanup + 16 (LibEntryPoint.mm:220) 11 XYZ 0x0000000104743d28 -[UnityAppController applicationWillTerminate:] + 36 (UnityAppController.mm:796) 12 UIKitCore 0x00000001873d98f4 -[UIApplication _terminateWithStatus:] + 244 (UIApplication.m:6844) 13 UIKitCore 0x0000000186ac67b4 -[_UISceneLifecycleMultiplexer _evalTransitionToSettings:fromSettings:forceExit:withTransitionStore:] + 128 (_UISceneLifecycleMultiplexer.m:808) 14 UIKitCore 0x0000000186cb7314 -[_UISceneLifecycleMultiplexer forceExitWithTransitionContext:scene:] + 224 (_UISceneLifecycleMultiplexer.m:482) 15 UIKitCore 0x00000001873d6574 -[UIApplication workspaceShouldExit:withTransitionContext:] + 212 (UIApplication.m:3776) 16 FrontBoardServices 0x0000000195f42c98 __63-[FBSWorkspaceScenesClient willTerminateWithTransitionContext:]_block_invoke_2 + 80 (FBSWorkspaceScenesClient.m:331) 17 FrontBoardServices 0x0000000195efd884 -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:] + 240 (FBSWorkspace.m:352) 18 FrontBoardServices 0x0000000195f42c30 __63-[FBSWorkspaceScenesClient willTerminateWithTransitionContext:]_block_invoke + 132 (FBSWorkspaceScenesClient.m:328) 19 libdispatch.dylib 0x0000000183d1a5b0 _dispatch_client_callout + 20 (object.m:560) 20 libdispatch.dylib 0x0000000183d1e0e4 _dispatch_block_invoke_direct + 268 (queue.c:484) 21 FrontBoardServices 0x0000000195eff164 FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK + 48 (FBSSerialQueue.m:157) 22 FrontBoardServices 0x0000000195efe5a4 -[FBSSerialQueue _targetQueue_performNextIfPossible] + 220 (FBSSerialQueue.m:181) 23 FrontBoardServices 0x0000000195f02bb4 -[FBSSerialQueue _performNextFromRunLoopSource] + 28 (FBSSerialQueue.m:194) 24 CoreFoundation 0x00000001840c8a7c CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 28 (CFRunLoop.c:1967) 25 CoreFoundation 0x00000001840d9498 __CFRunLoopDoSource0 + 208 (CFRunLoop.c:2011) 26 CoreFoundation 0x00000001840142bc __CFRunLoopDoSources0 + 376 (CFRunLoop.c:2056) 27 CoreFoundation 0x000000018401995c __CFRunLoopRun + 820 (CFRunLoop.c:2930) 28 CoreFoundation 0x000000018402d24c CFRunLoopRunSpecific + 600 (CFRunLoop.c:3247) 29 GraphicsServices 0x000000019fbd7484 GSEventRunModal + 164 (GSEvent.c:2200) 30 UIKitCore 0x00000001869a4110 -[UIApplication _run] + 1100 (UIApplication.m:3441) 31 UIKitCore 0x0000000186721088 UIApplicationMain + 2204 (UIApplication.m:4981) 32 XYZ 0x0000000104725588 main + 184 (main.mm:72) 33 dyld 0x00000001092b5e64 start + 520 (dyldMain.cpp:888)

Hi, In Xcode organiser we are seeing below crash as the top most crash. We could not conclude anything with the call stack that is available. This crash is bumping our crash rates in app store connect significantly. Can someone help to figure out the root cause for this crash? Thread 0 Crashed: 0 libsystem_kernel.dylib 0x00000001fc4e9b78 __pthread_kill + 8 1 libsystem_pthread.dylib 0x0000000235b083bc pthread_kill + 268 (pthread.c:1668) 2 libsystem_c.dylib 0x00000001cfcb444c __abort + 128 (abort.c:155) 3 libsystem_c.dylib 0x00000001cfc5c528 abort + 180 (abort.c:126) 4 libc++abi.dylib 0x00000001dd8e9b7c abort_message + 132 (abort_message.cpp:78) 5 libc++abi.dylib 0x00000001dd8d99c4 demangling_terminate_handler() + 336 (cxa_default_handlers.cpp:71) 6 libobjc.A.dylib 0x00000001dd7e4c98 _objc_terminate() + 160 (objc-exception.mm:704) 7 UnityFramework 0x00000001077acab0 CPPExceptionTerminate() + 496 (BSG_KSCrashSentry_CPPException.mm:192) 8 libc++abi.dylib 0x00000001dd8e8f18 std::__terminate(void (*)()) + 20 (cxa_handlers.cpp:59) 9 libc++abi.dylib 0x00000001dd8e8eb4 std::terminate() + 64 (cxa_handlers.cpp:88) 10 libdispatch.dylib 0x00000001c47e0a40 _dispatch_client_callout + 40 (object.m:563) 11 libdispatch.dylib 0x00000001c47e44e0 _dispatch_block_invoke_direct + 264 (queue.c:501) 12 FrontBoardServices 0x00000001d6cdac70 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 48 (FBSSerialQueue.m:157) 13 FrontBoardServices 0x00000001d6cda040 -[FBSSerialQueue _targetQueue_performNextIfPossible] + 220 (FBSSerialQueue.m:181) 14 FrontBoardServices 0x00000001d6cde700 -[FBSSerialQueue _performNextFromRunLoopSource] + 28 (FBSSerialQueue.m:194) 15 CoreFoundation 0x00000001c4b9bf04 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28 (CFRunLoop.c:1972) 16 CoreFoundation 0x00000001c4bacc90 __CFRunLoopDoSource0 + 208 (CFRunLoop.c:2016) 17 CoreFoundation 0x00000001c4ae6184 __CFRunLoopDoSources0 + 268 (CFRunLoop.c:2053) 18 CoreFoundation 0x00000001c4aebb4c __CFRunLoopRun + 828 (CFRunLoop.c:2951) 19 CoreFoundation 0x00000001c4aff6b8 CFRunLoopRunSpecific + 600 (CFRunLoop.c:3268) 20 GraphicsServices 0x00000001e0b99374 GSEventRunModal + 164 (GSEvent.c:2200) 21 UIKitCore 0x00000001c7464e88 -[UIApplication _run] + 1100 (UIApplication.m:3511) 22 UIKitCore 0x00000001c71e65ec UIApplicationMain + 364 (UIApplication.m:5064) 23 UnityFramework 0x0000000106054c9c -[UnityFramework runUIApplicationMainWithArgc:argv:] + 108 (main.mm:124) 24 MyGame 0x0000000104c916a0 main + 22176 (main.mm:28) 25 dyld 0x000000010567dce4 start + 520 (dyldMain.cpp:879) [2022-03-29_20-00-15.8116_-0700-583a4bdd5502a8b86aae9cb5839c125273fdb427.crash](https://developer.apple.com/forums/content/attachment/eccc16fc-dc3b-4c62-962b-e3aa27e91418)