Details
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Bug
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Resolution: Cannot Reproduce
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P1: Critical
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None
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4.7.2, 4.8.1, 5.3.1
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OS X
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macOS
Description
My application closes when I close the QMainWindow on OS X.
The problems to be located in the menu items which are moved into the application menu. When the window is closed I open a message box asking if somebody wants to save the current document. It seems that during this time several events run up in QApplication's queue. After agreeing to he message box and closing the window the QActions are also destroyed - but the NSMenuItem objects's tags are not updated and the QAction is still stored as zombie pointer.
After QApplication enters the main loop it dispatches the queued events, changing the modal state of the menu. This accesses the zombie pointer and leads to the crash.
It is not always reproducible without problems since if timing is good the free memory still contain valid data and the application does not crash.
StackTrace:
0 QtGui 0x0068d907 QAction::isEnabled() const + 9 1 QtGui 0x00674c7d qt_mac_set_modal_state_helper_recursive(NSMenu*, NSMenu*, bool) + 365 2 QtGui 0x00674c43 qt_mac_set_modal_state_helper_recursive(NSMenu*, NSMenu*, bool) + 307 3 QtGui 0x00679b96 QMenuBarPrivate::macUpdateMenuBarImmediatly() + 2464 4 com.apple.CoreFoundation 0x9564f28a -[NSObject performSelector:] + 58 5 QtGui 0x00642df3 -[NSApplication(QApplicationIntegration) qt_sendPostedMessage:] + 323 6 QtGui 0x00642bec -[NSApplication(QApplicationIntegration) qt_filterEvent:] + 140 7 QtGui 0x00642e7f -[QNSApplication sendEvent:] + 47 8 com.apple.AppKit 0x9b0c66d5 -[NSApplication run] + 1007 9 QtGui 0x0064ca0a QEventDispatcherMac::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 956 10 QtCore 0x013ad790 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 494 11 QtCore 0x013b09a1 QCoreApplication::exec() + 179