Details
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Bug
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Resolution: Done
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P1: Critical
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5.9.1
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None
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Windows 8 embedded
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4c3246e49521b6341ddcc513814ae03e6d8f1d3e
Description
After 1000-70000 random mouseclicks in an application, a crash happens.
> Qt5Quick.dll!QQuickEventPoint::grabber() Line 523 C++ Qt5Quick.dll!QQuickWindowPrivate::flushFrameSynchronousEvents() Line 2107 C++ Qt5Quick.dll!QSGWindowsRenderLoop::renderWindow(QQuickWindow * window) Line 458 C++ Qt5Quick.dll!QSGWindowsRenderLoop::render() Line 389 C++ Qt5Quick.dll!QSGWindowsRenderLoop::event(QEvent * event) Line 369 C++ Qt5Widgets.dll!QApplicationPrivate::notify_helper(QObject * receiver, QEvent * e) Line 3718 C++ Qt5Widgets.dll!QApplication::notify(QObject * receiver, QEvent * e) Line 3680 C++ Qt5Core.dll!QCoreApplication::notifyInternal2(QObject * receiver, QEvent * event) Line 1018 C++ Qt5Core.dll!QEventDispatcherWin32Private::sendTimerEvent(int timerId) Line 447 C++ Qt5Core.dll!QEventDispatcherWin32::event(QEvent * e) Line 1056 C++ Qt5Widgets.dll!QApplicationPrivate::notify_helper(QObject * receiver, QEvent * e) Line 3718 C++ Qt5Widgets.dll!QApplication::notify(QObject * receiver, QEvent * e) Line 3680 C++ Qt5Core.dll!QCoreApplication::notifyInternal2(QObject * receiver, QEvent * event) Line 1018 C++ Qt5Core.dll!QCoreApplicationPrivate::sendPostedEvents(QObject * receiver, int event_type, QThreadData * data) Line 1678 C++ qwindows.dll!QWindowsGuiEventDispatcher::sendPostedEvents() Line 82 C++ Qt5Core.dll!qt_internal_proc(HWND__ * hwnd, unsigned int message, unsigned __int64 wp, __int64 lp) Line 236 C++ user32.dll!UserCallWinProcCheckWow () Unknown user32.dll!DispatchMessageWorker () Unknown Qt5Core.dll!QEventDispatcherWin32::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags) Line 627 C++ qwindows.dll!QWindowsGuiEventDispatcher::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags) Line 75 C++ Qt5Core.dll!QEventLoop::exec(QFlags<enum QEventLoop::ProcessEventsFlag> flags) Line 211 C++ Qt5Core.dll!QCoreApplication::exec() Line 1291 C++
(Note. release build)
The issue seems to be that
auto point = event->pointById(d->touchMouseId);
gives point to be a nullpointer sometimes, and the following lines dereferences it.