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Bug
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Resolution: Incomplete
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P1: Critical
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None
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5.7.0
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None
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Windows 10 64-bit with Visual Studio 2015, debugged program is 32-bit, Qt version 5.7
Some few times I get a crash in QApplicationPrivate::notify_helper on using the receiver parameter. Some days the crash happens once or more, but most days it does not happen at all. I cannot reproduce the crash at will, it just sometimes happens. I would guess that this would be a racing condition.
The crash happens on the lines :
// deliver the event
bool consumed = receiver->event(e);
The receiver parameter looks like it is pointing to a deleted object. Its dump in the debugger looks like pointing to released memory :
__vfptr = 0x010091ec {???, ???, ???, ???, ???, ???, ???, ???, ???, ???, ???}
The call stack is as follows :
QApplicationPrivate::notify_helper(receiver=0x06f03b30, e=0x054564a8) Line 3799
QApplication::notify(receiver=0x06f03b30, e=0x054564a8) Line 3762
QCoreApplication::notifyInternal2(receiver=0x06f03b30, event=0x054564a8) Line 988
QCoreApplication::sendEvent(receiver=0x06f03b30, event=0x054564a8) Line 231
QCoreApplicationPrivate::sendPostedEvents(receiver=0x00000000, event_type=0, data=0x00833cf8) Line 1649
QEventDispatcherWin32::sendPostedEvents() Line 1294
QWindowsGuiEventDispatcher::sendPostedEvents() Line 82
qt_internal_proc(hwnd=0x0005089c, message=1025, wp=0, lp=0) Line 445
766d84f3() Unknown
[Frames below may be incorrect and/or missing, no symbols loaded for user32.dll]
766b6c40() Unknown
766b6541() Unknown
766b6300() Unknown
QEventDispatcherWin32::processEvents(flags={...}) Line 845
QWindowsGuiEventDispatcher::processEvents(flags={...}) Line 74
QEventLoop::processEvents(flags={...}) Line 135
QEventLoop::exec(flags={...}) Line 210
QCoreApplication::exec() Line 1261
QGuiApplication::exec() Line 1640
QApplication::exec() Line 2976
mymain(argc=5, argv=0x00833e48) Line 101
WinMain(hInstance=0x01010000, hPrevInstance=0x00000000, lpCmdLine=0x008060c9, nCmdShow=10) Line 8
invoke_main() Line 99
__scrt_common_main_seh() Line 255
__scrt_common_main() Line 300
WinMainCRTStartup() Line 17
- relates to
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- Closed
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