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  1. Qt
  2. QTBUG-135251

Crash on iPad with multi fingers gestures

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Details

    • Bug
    • Resolution: Unresolved
    • P1: Critical
    • None
    • 6.5.3
    • Quick: Layouts
    • None
    • Crash occurs on iOS 17 and iOS 18 on any iPad models (as far as we tested)
    • iOS/tvOS/watchOS

    Description

      The crash randomly occurs.

      To reproduce it, the example "layouts" can be used.

      Start the app, and open other apps as well on the ipad.

      Then execute the following gestures many many times in any order:

      • Switch between applications by using the 4 fingers gesture
      • Call the undo/redo by using the 3 fingers gesture

      At random time the application crashes with the following stack:

      1  objc_msgSend                                                                                (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/usr/lib/libobjc.A.dylib                                                              0x191e66c14 
2  -[_NSUndoStack popAndInvoke]                                                                (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/Frameworks/Foundation.framework/Foundation                            0x199233c2c 
3  -[NSUndoManager undoNestedGroup]                                                            (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/Frameworks/Foundation.framework/Foundation                            0x1992321bc 
4  -[UIUndoGestureInteraction undo:]                                                           (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore                       0x19ca68118 
5  -[UIUndoGestureInteraction performActionWithDirection:]                                     (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore                       0x19ca67b78 
6  -[UIUndoGestureInteraction _endPanWithDirection:]                                           (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore                       0x19ca678c8 
7  -[UIUndoGestureInteraction performGestureWithDirection:authenticationMessage:]              (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore                       0x19ca67c88 
8  -[_UIProductivityGestureAction _handleActionForWindowScene:]                                (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore                       0x19c3f71d4 
9  -[UIApplication _handleNonLaunchSpecificActions:forScene:withTransitionContext:completion:] (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore                       0x19c1dded4 
10 -[UIScene _emitSceneSettingsUpdateResponseForCompletion:afterSceneUpdateWork:]              (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore                       0x19bf74108 
11 -[UIScene scene:didUpdateWithDiff:transitionContext:completion:]                            (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore                       0x19c0334bc 
12 -[UIApplicationSceneClientAgent scene:handleEvent:withCompletion:]                          (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore                       0x19c0330d4 
13 -[FBSScene updater:didReceiveActions:forExtension:]                                         (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/PrivateFrameworks/FrontBoardServices.framework/FrontBoardServices     0x1b110f7b4 
14 -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:]                           (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/PrivateFrameworks/FrontBoardServices.framework/FrontBoardServices     0x1b10f4198 
15 __71-[FBSWorkspaceScenesClient sceneID:sendActions:toExtension:completion:]_block_invoke    (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/PrivateFrameworks/FrontBoardServices.framework/FrontBoardServices     0x1b112779c 
16 _dispatch_client_callout                                                                    (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/usr/lib/system/libdispatch.dylib                                                     0x1a1326cc0 
17 _dispatch_block_invoke_direct$VARIANT$mp                                                    (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/usr/lib/system/libdispatch.dylib                                                     0x1a12caeac 
18 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__                                                (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/PrivateFrameworks/FrontBoardServices.framework/FrontBoardServices     0x1b10f56b4 
19 -[FBSMainRunLoopSerialQueue _targetQueue_performNextIfPossible]                             (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/PrivateFrameworks/FrontBoardServices.framework/FrontBoardServices     0x1b10f563c 
20 -[FBSMainRunLoopSerialQueue _performNextFromRunLoopSource]                                  (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/PrivateFrameworks/FrontBoardServices.framework/FrontBoardServices     0x1b10f5550 
21 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__                                  (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation                    0x199c34114 
22 __CFRunLoopDoSource0                                                                        (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation                    0x199c340ac 
23 __CFRunLoopDoSources0                                                                       (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation                    0x199c31de8 
24 __CFRunLoopRun                                                                              (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation                    0x199c30f2c 
25 CFRunLoopRunSpecific                                                                        (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation                    0x199c307c8 
26 GSEventRunModal                                                                             (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/PrivateFrameworks/GraphicsServices.framework/GraphicsServices         0x1d9664814 
27 -[UIApplication _run]                                                                       (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore                       0x19c12d268 
28 UIApplicationMain                                                                           (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore                       0x19c1d790c 
29 qt_main_wrapper                                                                             qioseventdispatcher.mm                                                                                                                                                                    206 0x102392474 
30 start                                                                                       (arm64) /Users/jerome.desfieux/Library/Developer/Xcode/iOS DeviceSupport/iPad7,5 17.7.5 (21H420)/Symbols/usr/lib/dyld                                                                         0x1bb173228

      For giving an order of magnitude, I need to play with gestures for about 30 minutes before having a crash. (note that with thousand of devices using our app, the crash happens every day and is critical for us).

      It looks very similar to this issue found in flutter (same stack):
      https://github.com/flutter/flutter/issues/154493

      which has been corrected by: https://github.com/flutter/engine/pull/53553

       

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          Bug - A problem which impairs or prevents the functions of the product. QTBUG-113569 iOS Crash (reported via Apple)

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              qt.team.quick.subscriptions Qt Quick and Widgets Team
              jd__ Jérôme Desfieux
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