Details
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Bug
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Resolution: Fixed
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P0: Blocker
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None
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6.8.1
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None
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macOS
Description
My widgets-based application is sometimes crashing upon exit. I believe this may be a regression related to QTBUG-116554, and possibly already fixed in the 6.8 branch (the QObjCWeakPointer change didn't make it to 6.8.1), but I am unable to test that so I wanted to report it just in case.
Lvl Function File Line Address 1 -[QNSView dealloc] qnsview.mm 177 0x10193da94 2 -[NSTouch dealloc] (arm64e) /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit 0x18bcf3df8 3 __RELEASE_OBJECTS_IN_THE_SET__ (arm64e) /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation 0x187f0dc40 4 -[__NSSetM dealloc] (arm64e) /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation 0x187f0db5c 5 -[NSEvent dealloc] (arm64e) /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit 0x18bbadac4 6 QCocoaDrag::~QCocoaDrag() qcocoadrag.mm 31 0x1018f93c4 7 QCocoaDrag::~QCocoaDrag() qcocoadrag.mm 30 0x1018f93b0 8 QCocoaDrag::~QCocoaDrag() qcocoadrag.mm 30 0x1018f93b0 9 QScopedPointerDeleter<QCocoaDrag>::cleanup(QCocoaDrag *) qscopedpointer.h 24 0x101904d98 10 QScopedPointer<QCocoaDrag, QScopedPointerDeleter<QCocoaDrag>>::~QScopedPointer() qscopedpointer.h 81 0x101904d88 11 QScopedPointer<QCocoaDrag, QScopedPointerDeleter<QCocoaDrag>>::~QScopedPointer() qscopedpointer.h 79 0x101904d84 12 QCocoaIntegration::~QCocoaIntegration() qcocoaintegration.mm 206 0x101904d84 13 QCocoaIntegration::~QCocoaIntegration() qcocoaintegration.mm 180 0x101904fa4 14 QCocoaIntegration::~QCocoaIntegration() qcocoaintegration.mm 180 0x101904fa0 15 non-virtual thunk to QCocoaIntegration::~QCocoaIntegration() qcocoaintegration.mm 0x101904fa0 16 QGuiApplicationPrivate::~QGuiApplicationPrivate() qguiapplication.cpp 1832 0x100617d08 17 QApplicationPrivate::~QApplicationPrivate() qapplication.cpp 144 0x101095220 18 QApplicationPrivate::~QApplicationPrivate() qapplication.cpp 144 0x10109521c 19 QScopedPointerDeleter<QObjectData>::cleanup(QObjectData *) qscopedpointer.h 24 0x1022c6f90 20 QScopedPointer<QObjectData, QScopedPointerDeleter<QObjectData>>::~QScopedPointer() qscopedpointer.h 81 0x1022c6f80
Minimal test case is as follows. The app just shows itself and auto-quits after 2 seconds. Before it quits, if you use a trackpad (e.g the built-in one on a MacBook) to move the cursor over the graphics view, then stop and lift your finger before it quits, it will often (but not always) crash during exit.
#include <QtWidgets> class MainWindow : public QMainWindow { public: MainWindow(QWidget *parent = nullptr) : QMainWindow{parent} { setWindowTitle("Test"); setCentralWidget(new QGraphicsView(this)); }; protected: void showEvent(QShowEvent *event) override { QTimer::singleShot(2000, this, []() { QCoreApplication::quit(); }); QMainWindow::showEvent(event); } }; int main(int argc, char *argv[]) { QApplication a(argc, argv); MainWindow *w = new MainWindow(); w->show(); return a.exec(); }