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[App Hang] CoreFoundation CFNOTIFICATIONCENTER #144623
Description
Steps to reproduce
We can't reproduce it on development environments, we just have the stacktrace from production (attached below).
Hardware Model: iPhone14,2
Role: Foreground
OS Version: iOS 16.6.1
Expected results
The app hang is not triggered
Actual results
App HangThe app was terminated while unresponsive
Hardware Model: iPhone14,2
Process: Preguntados
Identifier: com.etermax.preguntados
Version: 3.254.1
Role: Foreground
OS Version: iOS 16.6.1
App Hang: The app was terminated while unresponsive
0 libsystem_kernel.dylib +0x1b18 ___psynch_cvwait
1 libsystem_pthread.dylib +0xfd0 __pthread_cond_wait
2 Flutter +0x570f8 std::_LIBCPP_ABI_NAMESPACE::__libcpp_condvar_wait[abi:v15000](_opaque_pthread_cond_t*, _opaque_pthread_mutex_t*) (__threading_support:335:10)
3 Flutter +0x3e95dc flutter::PlatformView::NotifyCreated() (waitable_event.cc:148:9)
4 Flutter +0x2e2c4 -[FlutterViewController appOrSceneBecameActive] (FlutterViewController.mm:1036:5)
5 Flutter +0x2e194 -[FlutterViewController applicationBecameActive:] (FlutterViewController.mm:983:3)
6 CoreFoundation +0x2f2d4 ___CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__
7 CoreFoundation +0x2ec9c ____CFXRegistrationPost_block_invoke
8 CoreFoundation +0x2ebe4 __CFXRegistrationPost
9 CoreFoundation +0x2e134 __CFXNotificationPost
10 Foundation +0x2a7a0 -[NSNotificationCenter postNotificationName:object:userInfo:]
11 UIKitCore +0x18c6fc -[UIApplication _stopDeactivatingForReason:]
12 UIKitCore +0x13ac18 -[_UISceneLifecycleMultiplexer _performBlock:withApplicationOfDeactivationReasons:fromReasons:]
13 UIKitCore +0x139654 -[_UISceneLifecycleMultiplexer _evalTransitionToSettings:fromSettings:forceExit:withTransitionStore:]
14 UIKitCore +0x138fbc -[_UISceneLifecycleMultiplexer uiScene:transitionedFromState:withTransitionContext:]
15 UIKitCore +0x138e8c ___186-[_UIWindowSceneFBSSceneTransitionContextDrivenLifecycleSettingsDiffAction _performActionsForUIScene:withUpdatedFBSScene:settingsDiff:fromSettings:transitionContext:lifecycleActionType:]_block_invoke
16 UIKitCore +0x138d94 +[BSAnimationSettings(UIKit) tryAnimatingWithSettings:fromCurrentState:actions:completion:]
17 UIKitCore +0x13861c __UISceneSettingsDiffActionPerformChangesWithTransitionContextAndCompletion
18 UIKitCore +0x1382cc -[_UIWindowSceneFBSSceneTransitionContextDrivenLifecycleSettingsDiffAction _performActionsForUIScene:withUpdatedFBSScene:settingsDiff:fromSettings:transitionContext:lifecycleActionType:]
19 UIKitCore +0x4bc0a4 ___64-[UIScene scene:didUpdateWithDiff:transitionContext:completion:]_block_invoke.225
20 UIKitCore +0x137450 -[UIScene _emitSceneSettingsUpdateResponseForCompletion:afterSceneUpdateWork:]
21 UIKitCore +0x1372c0 -[UIScene scene:didUpdateWithDiff:transitionContext:completion:]
22 UIKitCore +0x137100 -[UIApplicationSceneClientAgent scene:handleEvent:withCompletion:]
23 FrontBoardServices +0xe5b0 -[FBSScene updater:didUpdateSettings:withDiff:transitionContext:completion:]
24 FrontBoardServices +0xe2fc ___94-[FBSWorkspaceScenesClient _queue_updateScene:withSettings:diff:transitionContext:completion:]_block_invoke_2
25 FrontBoardServices +0xe198 -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:]
26 FrontBoardServices +0xe0b4 ___94-[FBSWorkspaceScenesClient _queue_updateScene:withSettings:diff:transitionContext:completion:]_block_invoke
27 libdispatch.dylib +0x42fc __dispatch_client_callout
28 libdispatch.dylib +0x7d44 __dispatch_block_invoke_direct
29 FrontBoardServices +0xa51c __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__
30 FrontBoardServices +0xa49c -[FBSMainRunLoopSerialQueue _targetQueue_performNextIfPossible]
31 FrontBoardServices +0xa374 -[FBSMainRunLoopSerialQueue _performNextFromRunLoopSource]
32 CoreFoundation +0x37128 ___CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__
33 CoreFoundation +0x363a4 ___CFRunLoopDoSource0
34 CoreFoundation +0x34bb8 ___CFRunLoopDoSources0
35 CoreFoundation +0x33894 ___CFRunLoopRun
36 CoreFoundation +0x33474 _CFRunLoopRunSpecific
37 GraphicsServices +0x34f4 _GSEventRunModal
38 UIKitCore +0x22c628 -[UIApplication _run]
39 UIKitCore +0x22bc64 _UIApplicationMain
40 Preguntados +0x1bca8 main (main.m:8:22)
41 dyld +0x5dc8 start
Code sample
n/a
Screenshots or Video
No response
Logs
Threads Log:
Thread 0 - com.apple.main-thread - (TH_STATE_WAITING)
0 libsystem_kernel.dylib +0x1b18 ___psynch_cvwait
1 libsystem_pthread.dylib +0xfd0 __pthread_cond_wait
2 Flutter +0x570f8 std::_LIBCPP_ABI_NAMESPACE::__libcpp_condvar_wait[abi:v15000](_opaque_pthread_cond_t*, _opaque_pthread_mutex_t*) (__threading_support:335:10)
3 Flutter +0x3e95dc flutter::PlatformView::NotifyCreated() (waitable_event.cc:148:9)
4 Flutter +0x2e2c4 -[FlutterViewController appOrSceneBecameActive] (FlutterViewController.mm:1036:5)
5 Flutter +0x2e194 -[FlutterViewController applicationBecameActive:] (FlutterViewController.mm:983:3)
6 CoreFoundation +0x2f2d4 ___CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__
7 CoreFoundation +0x2ec9c ____CFXRegistrationPost_block_invoke
8 CoreFoundation +0x2ebe4 __CFXRegistrationPost
9 CoreFoundation +0x2e134 __CFXNotificationPost
10 Foundation +0x2a7a0 -[NSNotificationCenter postNotificationName:object:userInfo:]
11 UIKitCore +0x18c6fc -[UIApplication _stopDeactivatingForReason:]
12 UIKitCore +0x13ac18 -[_UISceneLifecycleMultiplexer _performBlock:withApplicationOfDeactivationReasons:fromReasons:]
13 UIKitCore +0x139654 -[_UISceneLifecycleMultiplexer _evalTransitionToSettings:fromSettings:forceExit:withTransitionStore:]
14 UIKitCore +0x138fbc -[_UISceneLifecycleMultiplexer uiScene:transitionedFromState:withTransitionContext:]
15 UIKitCore +0x138e8c ___186-[_UIWindowSceneFBSSceneTransitionContextDrivenLifecycleSettingsDiffAction _performActionsForUIScene:withUpdatedFBSScene:settingsDiff:fromSettings:transitionContext:lifecycleActionType:]_block_invoke
16 UIKitCore +0x138d94 +[BSAnimationSettings(UIKit) tryAnimatingWithSettings:fromCurrentState:actions:completion:]
17 UIKitCore +0x13861c __UISceneSettingsDiffActionPerformChangesWithTransitionContextAndCompletion
18 UIKitCore +0x1382cc -[_UIWindowSceneFBSSceneTransitionContextDrivenLifecycleSettingsDiffAction _performActionsForUIScene:withUpdatedFBSScene:settingsDiff:fromSettings:transitionContext:lifecycleActionType:]
19 UIKitCore +0x4bc0a4 ___64-[UIScene scene:didUpdateWithDiff:transitionContext:completion:]_block_invoke.225
20 UIKitCore +0x137450 -[UIScene _emitSceneSettingsUpdateResponseForCompletion:afterSceneUpdateWork:]
21 UIKitCore +0x1372c0 -[UIScene scene:didUpdateWithDiff:transitionContext:completion:]
22 UIKitCore +0x137100 -[UIApplicationSceneClientAgent scene:handleEvent:withCompletion:]
23 FrontBoardServices +0xe5b0 -[FBSScene updater:didUpdateSettings:withDiff:transitionContext:completion:]
24 FrontBoardServices +0xe2fc ___94-[FBSWorkspaceScenesClient _queue_updateScene:withSettings:diff:transitionContext:completion:]_block_invoke_2
25 FrontBoardServices +0xe198 -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:]
26 FrontBoardServices +0xe0b4 ___94-[FBSWorkspaceScenesClient _queue_updateScene:withSettings:diff:transitionContext:completion:]_block_invoke
27 libdispatch.dylib +0x42fc __dispatch_client_callout
28 libdispatch.dylib +0x7d44 __dispatch_block_invoke_direct
29 FrontBoardServices +0xa51c __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__
30 FrontBoardServices +0xa49c -[FBSMainRunLoopSerialQueue _targetQueue_performNextIfPossible]
31 FrontBoardServices +0xa374 -[FBSMainRunLoopSerialQueue _performNextFromRunLoopSource]
32 CoreFoundation +0x37128 ___CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__
33 CoreFoundation +0x363a4 ___CFRunLoopDoSource0
34 CoreFoundation +0x34bb8 ___CFRunLoopDoSources0
35 CoreFoundation +0x33894 ___CFRunLoopRun
36 CoreFoundation +0x33474 _CFRunLoopRunSpecific
37 GraphicsServices +0x34f4 _GSEventRunModal
38 UIKitCore +0x22c628 -[UIApplication _run]
39 UIKitCore +0x22bc64 _UIApplicationMain
40 Preguntados +0x1bca8 main (main.m:8:22)
41 dyld +0x5dc8 start
Thread 1 - com.apple.uikit.eventfetch-thread - (TH_STATE_WAITING)
0 libsystem_kernel.dylib +0x1174 _mach_msg2_trap
1 libsystem_kernel.dylib +0xf0c _mach_msg2_internal
2 libsystem_kernel.dylib +0xe24 _mach_msg_overwrite
3 libsystem_kernel.dylib +0xc64 _mach_msg
4 CoreFoundation +0x35b18 ___CFRunLoopServiceMachPort
5 CoreFoundation +0x33a10 ___CFRunLoopRun
6 CoreFoundation +0x33474 _CFRunLoopRunSpecific
7 Foundation +0x2c488 -[NSRunLoop(NSRunLoop) runMode:beforeDate:]
8 Foundation +0x59748 -[NSRunLoop(NSRunLoop) runUntilDate:]
9 UIKitCore +0x18e4a4 -[UIEventFetcher threadMain]
10 Foundation +0xafddc ___NSThread__start__
11 libsystem_pthread.dylib +0x24d0 __pthread_start
Thread 2 - (TH_STATE_WAITING)
0 libsystem_kernel.dylib +0x96cc ___workq_kernreturn
1 libsystem_pthread.dylib +0x19ac __pthread_wqthread
Thread 3 - com.google.firebase.crashlytics.MachExceptionServer - (TH_STATE_WAITING)
0 libsystem_kernel.dylib +0x1174 _mach_msg2_trap
1 libsystem_kernel.dylib +0xf0c _mach_msg2_internal
2 libsystem_kernel.dylib +0xe24 _mach_msg_overwrite
3 libsystem_kernel.dylib +0xc64 _mach_msg
4 FirebaseCrashlytics +0x18a4c FIRCLSMachExceptionReadMessage (FIRCLSMachException.c:192:7)
5 libsystem_pthread.dylib +0x24d0 __pthread_start
Thread 4 - KSCrash Exception Handler (Secondary) - (TH_STATE_WAITING)
0 libsystem_kernel.dylib +0x1174 _mach_msg2_trap
1 libsystem_kernel.dylib +0xf0c _mach_msg2_internal
2 libsystem_kernel.dylib +0x5714 _thread_suspend
3 Bugsnag +0x9a44 ksmachexc_i_handleExceptions (BSG_KSCrashSentry_MachException.c:222:9)
4 libsystem_pthread.dylib +0x24d0 __pthread_start
Thread 5 - KSCrash Exception Handler (Primary) - (TH_STATE_WAITING)
0 libsystem_kernel.dylib +0x1174 _mach_msg2_trap
1 libsystem_kernel.dylib +0xf0c _mach_msg2_internal
2 libsystem_kernel.dylib +0xe24 _mach_msg_overwrite
3 libsystem_kernel.dylib +0xc64 _mach_msg
4 Bugsnag +0x9a78 ksmachexc_i_handleExceptions (BSG_KSCrashSentry_MachException.c:229:36)
5 libsystem_pthread.dylib +0x24d0 __pthread_start
Flutter Doctor output
Doctor output
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.19.1, on macOS 14.2.1 23C71 darwin-arm64, locale en-AR)
[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 15.1)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2023.1)
[✓] IntelliJ IDEA Community Edition (version 2022.2.2)
[✓] VS Code (version 1.85.1)
[✓] Connected device (3 available)
[✓] Network resources
• No issues found!Reacted by Milen Marinov
Activity
darshankawar commentedon Mar 6, 2024
@fernan88 We would be interested to look into Flutter frames above but currently as above, it doesn't give any insights. Is there a way for you to provide symbolicated log for flutter frames ? See if this is useful to provide the same.
fernan88 commentedon Mar 6, 2024
Thanks @darshankawar I have updated with the symbolicated logs as you requested.
darshankawar commentedon Mar 7, 2024
Based on these logs, looks related / similar to #94524 and #141554
Keeping it open for team's input / tracking.
jmagman commentedon Mar 7, 2024
cc @cbracken you'll probably see this on macOS too
https://github.com/flutter/engine/blob/9e8ccaa3842e41b9b5ddede0104c10979f954c74/shell/common/platform_view.cc#L61-L74
teemo2025 commentedon May 9, 2025
I encountered the same issue. Has this problem been resolved?
DavidYang1121 commentedon Dec 2, 2025
We encountered the same issue. The Flutter version is 3.27.4, and the stack trace is as follows:
1 libsystem_kernel.dylib ___psynch_cvwait
2 libsystem_pthread.dylib __pthread_cond_wait
3 Flutter std::_fl::condition_variable::wait(std::_fl::unique_lockstd::_fl::mutex&) condition_variable.cpp 46
4 Flutter fml::ManualResetWaitableEvent::Wait() waitable_event.cc 148
5 Flutter flutter::PlatformView::NotifyCreated() platform_view.cc 73
6 Flutter -[FlutterViewController appOrSceneBecameActive] FlutterViewController.mm 1050
7 Flutter -[FlutterViewController applicationBecameActive:] FlutterViewController.mm 997
8 CoreFoundation _CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER
9 CoreFoundation ____CFXRegistrationPost_block_invoke
10 CoreFoundation __CFXRegistrationPost
11 CoreFoundation __CFXNotificationPost
12 Foundation -[NSNotificationCenter postNotificationName:object:userInfo:]
13 UIKitCore -[UIApplication _stopDeactivatingForReason:]
14 UIKitCore -[_UISceneLifecycleMultiplexer _performBlock:withApplicationOfDeactivationReasons:fromReasons:]
15 UIKitCore -[_UISceneLifecycleMultiplexer _evalTransitionToSettings:fromSettings:forceExit:withTransitionStore:]
16 UIKitCore -[_UISceneLifecycleMultiplexer uiScene:transitionedFromState:withTransitionContext:]
17 UIKitCore ___186-[_UIWindowSceneFBSSceneTransitionContextDrivenLifecycleSettingsDiffAction _performActionsForUIScene:withUpdatedFBSScene:settingsDiff:fromSettings:transitionContext:lifecycleActionType:]_block_invoke
18 UIKitCore +[BSAnimationSettings(UIKit) tryAnimatingWithSettings:fromCurrentState:actions:completion:]
19 UIKitCore __UISceneSettingsDiffActionPerformChangesWithTransitionContextAndCompletion
20 UIKitCore -[_UIWindowSceneFBSSceneTransitionContextDrivenLifecycleSettingsDiffAction _performActionsForUIScene:withUpdatedFBSScene:settingsDiff:fromSettings:transitionContext:lifecycleActionType:]
21 UIKitCore ___64-[UIScene scene:didUpdateWithDiff:transitionContext:completion:]_block_invoke.218
22 UIKitCore -[UIScene _emitSceneSettingsUpdateResponseForCompletion:afterSceneUpdateWork:]
23 UIKitCore -[UIScene scene:didUpdateWithDiff:transitionContext:completion:]
24 UIKitCore -[UIApplicationSceneClientAgent scene:handleEvent:withCompletion:]
25 FrontBoardServices ___76-[FBSScene updater:didUpdateSettings:withDiff:transitionContext:completion:]_block_invoke.129
26 FrontBoardServices -[FBSScene _callOutQueue_maybeCoalesceClientSettingsUpdates:]
27 FrontBoardServices -[FBSScene updater:didUpdateSettings:withDiff:transitionContext:completion:]
28 FrontBoardServices ___94-[FBSWorkspaceScenesClient _queue_updateScene:withSettings:diff:transitionContext:completion:]_block_invoke_2.cold.1
29 FrontBoardServices ___94-[FBSWorkspaceScenesClient _queue_updateScene:withSettings:diff:transitionContext:completion:]_block_invoke_2
30 FrontBoardServices -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:]
31 libdispatch.dylib __dispatch_client_callout
32 libdispatch.dylib __dispatch_block_invoke_direct
33 BoardServices _BSSERVICEMAINRUNLOOPQUEUE_IS_CALLING_OUT_TO_A_BLOCK
34 BoardServices _BSServiceMainRunLoopSourceHandler
35 CoreFoundation _CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION
36 CoreFoundation ___CFRunLoopDoSource0
37 CoreFoundation ___CFRunLoopDoSources0
38 CoreFoundation ___CFRunLoopRun
39 CoreFoundation __CFRunLoopRunSpecificWithOptions
40 GraphicsServices _GSEventRunModal
41 UIKitCore -[UIApplication _run]
42 UIKitCore _UIApplicationMain
43 TT main main.mm 25
@darshankawar @jonahwilliams @jmagman please have a look