hluk/CopyQ

Segfault and application crash when clicking outside the tray menu

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#3187 opened on Sep 20, 2025

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Qt bugbughelp wantedmacOS

Description

Describe the bug On macOS with Qt6, the application sometimes crashes with a segmentation fault (Signal 11) when interacting with the tray icon or global shortcuts. The crash appears to occur when the main window loses focus (resignKeyWindow) and a shortcut triggers tray/menu operations simultaneously. This prevents reliable tray usage and makes the application unstable.

To Reproduce Steps to reproduce the behavior:

  1. Build CopyQ with Qt6 on macOS (tested on macOS 26).
  2. Launch CopyQ and ensure the main window is active.
  3. Press the global tray shortcut. Now close the tray by clicking outside of this tray menu.
  4. This will lead to immediate closure of application without any prompt or crash report.

Expected behavior

  • The tray icon should respond to the shortcut.
  • The application should never crash (Signal 11) regardless of window focus or shortcut timing.

Version, OS and Environment

  • OS: macOS 26
  • Qt version: Qt6
  • Installation method: built from source

Additional context

  • Crash stack trace consistently shows:
jazz@Jaswanths-MacBook-Air CopyQ % cat /tmp/copyq_crash_debug.txt === CRASH/TERMINATION AT Sat Sep 20 07:42:25 2025 === Reason: Signal 11 Stack trace: 0: 0 CopyQ 0x000000010453031c _ZN12_GLOBAL__N_115writeStackTraceERK7QString + 328 1: 1 CopyQ 0x00000001045300fc _ZN12_GLOBAL__N_112crashHandlerEi + 92 2: 2 libsystem_platform.dylib 0x0000000188d22744 _sigtramp + 56 3: 3 libqcocoa.dylib 0x0000000107db2a7c _ZN12QCocoaWindow18windowDidResignKeyEv + 996 4: 4 libqcocoa.dylib 0x0000000107db2a7c _ZN12QCocoaWindow18windowDidResignKeyEv + 996 5: 5 QtCore 0x0000000106b48240 _ZN18QMetaMethodInvoker10invokeImplE11QMetaMethodPvN2Qt14ConnectionTypeExPKPKvPKPKcPKPKN9QtPrivate18QMetaTypeInterfaceE + 916 6: 6 QtCore 0x0000000106b4bf74 _ZN11QMetaMethod10invokeImplES_PvN2Qt14ConnectionTypeExPKPKvPKPKcPKPKN9QtPrivate18QMetaTypeInterfaceE + 76 7: 7 libqcocoa.dylib 0x0000000107db6960 ___ZL30qRegisterNotificationCallbacksv_block_invoke + 1220 8: 8 CoreFoundation 0x0000000188dae560 __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 128 9: 9 CoreFoundation 0x0000000188e170c4 ___CFXRegistrationPost_block_invoke + 92 10: 10 CoreFoundation 0x0000000188e17008 _CFXRegistrationPost + 436 11: 11 CoreFoundation 0x0000000188d8d08c _CFXNotificationPost + 740 12: 12 Foundation 0x000000018af963e0 -[NSNotificationCenter postNotificationName:object:userInfo:] + 88 13: 13 AppKit 0x000000018d249fcc -[NSWindow resignKeyWindow] + 620 14: 14 AppKit 0x000000018d2bf244 -[NSPanel resignKeyWindow] + 72 15: 15 AppKit 0x000000018de3c094 -[NSWindow _sendResignKeyWindow] + 100 16: 16 AppKit 0x000000018d249cc8 _NXEndKeyAndMain + 120 17: 17 AppKit 0x000000018d6f5f9c -[NSApplication _handleDeactivateEvent:] + 700 18: 18 AppKit 0x000000018dbf645c -[NSApplication(NSEventRouting) sendEvent:] + 1024 19: 19 libqcocoa.dylib 0x0000000107d7bc68 -[QNSApplication sendEvent:] + 84 20: 20 AppKit 0x000000018d6f0798 -[NSApplication _handleEvent:] + 60 21: 21 AppKit 0x000000018d19d748 -[NSApplication run] + 408 22: 22 libqcocoa.dylib 0x0000000107d88a70 _ZN21QCocoaEventDispatcher13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE + 2008 23: 23 QtCore 0x0000000106b465b4 _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE + 448 24: 24 QtCore 0x0000000106b3f670 _ZN16QCoreApplication4execEv + 220 25: 25 CopyQ 0x000000010452f774 main + 3460 26: 26 dyld 0x0000000188959d54 start + 7184 === END CRASH INFO ===

Contributor guide

Tech stack
cpp
Domain
desktop
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
5
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
C++ knowledgeQt framework experiencemacOS developmentdebugging skills
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
10
Research direction
The crash occurs in QCocoaWindow::windowDidResignKey (libqcocoa.dylib) when the main window loses focus concurrently with a tray shortcut. Investigate the Qt6 Cocoa plugin source code, specifically the windowDidResignKey method and its interaction with tray menu events. Check if there is a race condition or missing guard. The stack trace shows ZN12QCocoaWindow18windowDidResignKeyEv at multiple frames, indicating a possible recursive call or double delete. Study the CopyQ tray icon implementation (likely in src/) to see how it handles focus events and shortcuts. Review comments in the issue for additional clues.