QMenu Crashed On win10 sometimes, Why?

[MayEnjoy]

 	Qt5Core.dll!QRect::QRect(const QPoint & atopLeft, const QSize & asize) 行 191	C++
 	qwindows.dll!QWindowsWindow::initialize() 行 1385	C++
 	Qt5Gui.dll!QWindowPrivate::create(bool recursive, unsigned int nativeHandle) 行 538	C++
 	Qt5Gui.dll!QWindow::create() 行 651	C++
 	Qt5Widgets.dll!QWidgetPrivate::create() 行 1316	C++
 	Qt5Widgets.dll!QWidget::create(unsigned int window, bool initializeWindow, bool destroyOldWindow) 行 1182	C++
 	Qt5Widgets.dll!QWidgetPrivate::createWinId() 行 2386	C++
 	Qt5Widgets.dll!QWidgetPrivate::setScreen(QScreen * screen) 行 2421	C++
 	Qt5Widgets.dll!QMenuPrivate::popup(const QPoint & p, QAction * atAction, std::function<QPoint __cdecl(QSize const &)> positionFunction) 行 2388	C++
 	Qt5Widgets.dll!QMenu::popup(const QPoint & p, QAction * atAction) 行 2355	C++
 	Qt5Widgets.dll!QMenu::internalDelayedPopup() 行 3676	C++
 	Qt5Widgets.dll!QMenuPrivate::popupAction(QAction * action, int delay, bool activateFirst) 行 633	C++
 	Qt5Widgets.dll!QMenuPrivate::setCurrentAction(QAction * action, int popup, QMenuPrivate::SelectionReason reason, bool activateFirst) 行 726	C++
 	Qt5Widgets.dll!QMenu::mouseMoveEvent(QMouseEvent * e) 行 3497	C++
>	Qt5Widgets.dll!QWidget::event(QEvent * event) 行 9082	C++
 	Qt5Widgets.dll!QMenu::event(QEvent * e) 行 3088	C++
 	Qt5Widgets.dll!QApplicationPrivate::notify_helper(QObject * receiver, QEvent * e) 行 3632	C++
 	Qt5Widgets.dll!QApplication::notify(QObject * receiver, QEvent * e) 行 3076	C++
 	Qt5Core.dll!QCoreApplication::notifyInternal2(QObject * receiver, QEvent * event) 行 1063	C++
 	Qt5Widgets.dll!QApplicationPrivate::sendMouseEvent(QWidget * receiver, QMouseEvent * event, QWidget * alienWidget, QWidget * nativeWidget, QWidget * * buttonDown, QPointer<QWidget> & lastMouseReceiver, bool spontaneous, bool onlyDispatchEnterLeave) 行 2614	C++
 	Qt5Widgets.dll!QWidgetWindow::handleMouseEvent(QMouseEvent * event) 行 580	C++
 	Qt5Widgets.dll!QWidgetWindow::event(QEvent * event) 行 300	C++
 	Qt5Widgets.dll!QApplicationPrivate::notify_helper(QObject * receiver, QEvent * e) 行 3632	C++
 	Qt5Widgets.dll!QApplication::notify(QObject * receiver, QEvent * e) 行 3587	C++
 	Qt5Core.dll!QCoreApplication::notifyInternal2(QObject * receiver, QEvent * event) 行 1063	C++
 	Qt5Gui.dll!QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent * e) 行 2283	C++
 	Qt5Gui.dll!QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent * e) 行 2002	C++
 	Qt5Gui.dll!QWindowSystemInterface::sendWindowSystemEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags) 行 1169	C++
 	qwindows.dll!QWindowsGuiEventDispatcher::sendPostedEvents() 行 81	C++
 	Qt5Core.dll!QEventDispatcherWin32::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags) 行 530	C++
 	qwindows.dll!QWindowsGuiEventDispatcher::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags) 行 74	C++
 	Qt5Core.dll!QEventLoop::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag>) 行 139	C++
 	Qt5Core.dll!QEventLoop::exec(QFlags<enum QEventLoop::ProcessEventsFlag> flags) 行 232	C++
 	Qt5Core.dll!QCoreApplication::exec() 行 1372	C++

[jsulm]

@MayEnjoy What about asking a question and providing more details (like code)?

[MayEnjoy]

@jsulm sorry I can't provide code because it in a big project.

We replace our WTL App msg loop with Qt's and Embeded Wtl Window in Qt Widget.

Qt Version: 5.15.2.
OS: Win 10

https://github.com/qt/qtbase/blob/dev/src/plugins/platforms/windows/qwindowswindow.cpp#L1537

According above code, creationContext is null and no nullptr check.

[JoeCFD]

@MayEnjoy Did you try a lower version or a higher version to see if the issue is fixed?