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We're developing a AR app, and when app enter background after experience AR, sometimes it crashed. We compare iPhone X with iOS 13.7、14.4、14.6 and found that this only crashed in iOS 14.4 Is this iOS14.4's bug or unity's? Here is the crash : Exception Type: EXC_CRASH (SIGKILL) Exception Codes: 0x0000000000000000, 0x0000000000000000 Exception Note: EXC_CORPSE_NOTIFY Termination Reason: Namespace SPRINGBOARD, Code 0x8badf00d Termination Description: SPRINGBOARD, <RBSTerminateContext| domain:10 code:0x8BADF00D explanation:scene-update watchdog transgression: application<com.ezxr.thesongmemories>:2413 exhausted real (wall clock) time allowance of 10.00 seconds | ProcessVisibility: Background | ProcessState: Running | WatchdogEvent: scene-update | WatchdogVisibility: Background | WatchdogCPUStatistics: ( | "Elapsed total CPU time (seconds): 8.710 (user 8.710, system 0.000), 15% CPU", | "Elapsed application CPU time (seconds): 0.422, 1% CPU" | ) reportType:CrashLog maxTerminationResistance:Interactive> Triggered by Thread: 0 and the log found in iOS 14.4 Thread 0 name: Dispatch queue: com.apple.main-thread Thread 0 Crashed: 0 libsystem_kernel.dylib 0x00000001b79621ac __psynch_cvwait + 8 1 libsystem_pthread.dylib 0x00000001d54bf468 _pthread_cond_wait + 1192 2 Foundation 0x000000018acb33e4 -[NSOperation waitUntilFinished] + 584 3 CoreFoundation 0x00000001899698c0 _CFXNotificationPost + 796 4 Foundation 0x000000018ac304bc -[NSNotificationCenter postNotificationName:object:userInfo:] + 64 5 UIKitCore 0x000000018c3cee04 __47-[UIApplication _applicationDidEnterBackground]_block_invoke + 316 6 UIKitCore 0x000000018bcacc6c +[UIViewController _performWithoutDeferringTransitionsAllowingAnimation:actions:] + 164 7 UIKitCore 0x000000018c3ceb9c -[UIApplication _applicationDidEnterBackground] + 144 8 UIKitCore 0x000000018ba1dc2c __101-[_UISceneLifecycleMultiplexer _evalTransitionToSettings:fromSettings:forceExit:withTransitionStore:]_block_invoke_2 + 904 9 UIKitCore 0x000000018bf8af9c _UIScenePerformActionsWithLifecycleActionMask + 112 10 UIKitCore 0x000000018ba1d80c __101-[_UISceneLifecycleMultiplexer _evalTransitionToSettings:fromSettings:forceExit:withTransitionStore:]_block_invoke + 224 11 UIKitCore 0x000000018ba1d2cc -[_UISceneLifecycleMultiplexer _performBlock:withApplicationOfDeactivationReasons:fromReasons:] + 484 12 UIKitCore 0x000000018ba1d61c -[_UISceneLifecycleMultiplexer _evalTransitionToSettings:fromSettings:forceExit:withTransitionStore:] + 768 13 UIKitCore 0x000000018ba1ce58 -[_UISceneLifecycleMultiplexer uiScene:transitionedFromState:withTransitionContext:] + 340 14 UIKitCore 0x000000018ba253a4 __186-[_UIWindowSceneFBSSceneTransitionContextDrivenLifecycleSettingsDiffAction _performActionsForUIScene:withUpdatedFBSScene:settingsDiff:fromSettings:transitionContext:lifecycleActionType:]_block_invoke + 196 15 UIKitCore 0x000000018be9760c +[BSAnimationSettings+ 6936076 (UIKit) tryAnimatingWithSettings:actions:completion:] + 892 16 UIKitCore 0x000000018bfa36c4 _UISceneSettingsDiffActionPerformChangesWithTransitionContext + 272 17 UIKitCore 0x000000018ba2509c -[_UIWindowSceneFBSSceneTransitionContextDrivenLifecycleSettingsDiffAction _performActionsForUIScene:withUpdatedFBSScene:settingsDiff:fromSettings:transitionContext:lifecycleActionType:] + 384 18 UIKitCore 0x000000018b84c5a0 __64-[UIScene scene:didUpdateWithDiff:transitionContext:completion:]_block_invoke + 776 19 UIKitCore 0x000000018b84af14 -[UIScene _emitSceneSettingsUpdateResponseForCompletion:afterSceneUpdateWork:] + 256 20 UIKitCore 0x000000018b84c1c8 -[UIScene scene:didUpdateWithDiff:transitionContext:completion:] + 248 21 UIKitCore 0x000000018bec12e8 -[UIApplicationSceneClientAgent scene:handleEvent:withCompletion:] + 492 22 FrontBoardServices 0x0000000199778c94 -[FBSScene updater:didUpdateSettings:withDiff:transitionContext:completion:] + 484 23 FrontBoardServices 0x00000001997a5504 __94-[FBSWorkspaceScenesClient _queue_updateScene:withSettings:diff:transitionContext:completion:]_block_invoke_2 + 152 24 FrontBoardServices 0x00000001997874a0 -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:] + 240 25 FrontBoardServices 0x00000001997a5430 __94-[FBSWorkspaceScenesClient _queue_updateScene:withSettings:diff:transitionContext:completion:]_block_invoke + 396 26 libdispatch.dylib 0x0000000189601db0 _dispatch_client_callout + 20 27 libdispatch.dylib 0x0000000189605738 _dispatch_block_invoke_direct + 268 28 FrontBoardServices 0x00000001997cc250 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 48 29 FrontBoardServices 0x00000001997cbee0 -[FBSSerialQueue _targetQueue_performNextIfPossible] + 448 30 FrontBoardServices 0x00000001997cc434 -[FBSSerialQueue _performNextFromRunLoopSource] + 32 31 CoreFoundation 0x000000018998976c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28 32 CoreFoundation 0x0000000189989668 __CFRunLoopDoSource0 + 208 33 CoreFoundation 0x0000000189988960 __CFRunLoopDoSources0 + 268 34 CoreFoundation 0x0000000189982a8c __CFRunLoopRun + 824 35 CoreFoundation 0x000000018998221c CFRunLoopRunSpecific + 600 36 GraphicsServices 0x00000001a154e784 GSEventRunModal + 164 37 UIKitCore 0x000000018c3c2ee8 -[UIApplication _run] + 1072 38 UIKitCore 0x000000018c3c875c UIApplicationMain + 168 39 libswiftUIKit.dylib 0x000000019dce92e4 UIApplicationMain+ 94948 (_:_:_:_:) + 104 40 SongMemory 0x0000000104811fa4 0x1047bc000 + 352164 41 SongMemory 0x0000000104811f1c 0x1047bc000 + 352028 42 SongMemory 0x00000001048120b8 0x1047bc000 + 352440 43 libdyld.dylib 0x00000001896426b0 start + 4 And when we run it with xcode, the app just lose response, attaches show the what the thread is doing. SongMemory 2021-6-1, 11-11 AM.crash all_thread thread_name Some users stay in iOS 14.4, so is this some way to avoid this crash?