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Bug
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Resolution: Fixed
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P2: Important
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6.10
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None
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c1eda2ead (6.10), d66cfa93e (dev), b483fc5aa (dev), 1da8f2044 (6.10)
i'm seeing a crash in this scenario:
- create qApp, QQuickView
- destroy them
- re-create qApp, QQuickView
it crashes when QQuickNativeStyle::style() will returns a nullptr:
1 QtMin::QQuickStyleItemSlider::calculateGeometry() qquickstyleitemslider.cpp 32 0x1736f15c4 2 QtMin::QQuickStyleItem::updateGeometry() qquickstyleitem.cpp 275 0x1736e8728 3 QtMin::QQuickStyleItem::componentComplete() qquickstyleitem.cpp 471 0x1736ea314 4 QtMin::QQmlObjectCreator::finalize(QtMin::QQmlInstantiationInterrupt&) qqmlobjectcreator.cpp 1615 0x171d9c92c 5 QtMin::QQmlComponentPrivate::complete(QtMin::QQmlEnginePrivate *, QtMin::QQmlComponentPrivate::ConstructionState *) qqmlcomponent.cpp 1224 0x171ef84e0 6 QtMin::QQmlComponentPrivate::completeDeferred(QtMin::QQmlEnginePrivate *, std::vector<QtMin::QQmlComponentPrivate::ConstructionState> *) qqmlcomponent.cpp 1217 0x171ee0224 7 QtMin::QtQuickPrivate::completeDeferred(QtMin::QObject *, QtMin::QString const&, QtMin::QQuickUntypedDeferredPointer *, QtMin::QQmlEngine *) qquickdeferredexecute.cpp 166 0x17393c0a8 8 void QtMin::quickCompleteDeferred<QtMin::QQuickItem>(QtMin::QObject *, QtMin::QString const&, QtMin::QQuickDeferredPointer<QtMin::QQuickItem>&) qquickdeferredexecute_p_p.h 67 0x1737f75d4 9 QtMin::QQuickSliderPrivate::executeHandle(bool) qquickslider.cpp 223 0x1738d9928 10 QtMin::QQuickSlider::componentComplete() qquickslider.cpp 867 0x1738db3fc 11 QtMin::QQmlObjectCreator::finalize(QtMin::QQmlInstantiationInterrupt&) qqmlobjectcreator.cpp 1615 0x171d9c92c 12 QtMin::QQmlComponentPrivate::complete(QtMin::QQmlEnginePrivate *, QtMin::QQmlComponentPrivate::ConstructionState *) qqmlcomponent.cpp 1224 0x171ef84e0 13 QtMin::QQmlComponentPrivate::completeCreate() qqmlcomponent.cpp 1342 0x171ef68e0 14 QtMin::QQmlComponent::completeCreate() qqmlcomponent.cpp 1308 0x171efa6e4 15 QtMin::QQmlComponentPrivate::createWithProperties(QtMin::QObject *, QtMin::QMap<QtMin::QString, QtMin::QVariant>const&, QtMin::QQmlContext *, QtMin::QQmlComponentPrivate::CreateBehavior, bool) qqmlcomponent.cpp 996 0x171ef8328 16 QtMin::QQmlComponent::createWithInitialProperties(QtMin::QMap<QtMin::QString, QtMin::QVariant>const&, QtMin::QQmlContext *) qqmlcomponent.cpp 962 0x171eee444 17 QtMin::QQuickView::continueExecute() qquickview.cpp 516 0x1728befc0 18 QtMin::QQuickViewPrivate::execute(QtMin::QAnyStringView, QtMin::QAnyStringView) qquickview.cpp 92 0x1728bf2f8 19 QtMin::QQuickView::loadFromModule(QtMin::QAnyStringView, QtMin::QAnyStringView) qquickview.cpp 259 0x1728bf67c
observations:
- QtQuickControls2NativeStylePlugin::initializeEngine deletes/nulls the s_style pointer via qAddPostRoutine()
- QQuickNativeStyle::setStyle is never re-populated again via `QtQuickControls2NativeStylePlugin::initializeEngine`
so it smells like there is some caching that outlives the lifetime of the QApplication, which prevents initializeEngine from running again ...