QQuickStackView::initialItem gets deleted, leaving a dangling pointer

1 QQmlData::wasDeleted(QObject const *) qqmldata_p.h 310 0x100925c6c 
2 QV4::QObjectWrapper::wrap(QV4::ExecutionEngine *, QObject *) qv4qobjectwrapper_p.h 210 0x100925b69 
3 QV4::ExecutionEngine::fromVariant(QVariant const&) qv4engine.cpp 1381 0x100af7aa7 
4 loadProperty(QV4::ExecutionEngine *, QObject *, QQmlPropertyData const&) qv4qobjectwrapper.cpp 178 0x100c2f7c2 
5 QV4::QObjectWrapper::getProperty(QV4::ExecutionEngine *, QObject *, QQmlPropertyData *, bool) qv4qobjectwrapper.cpp 261 0x100c2ec2c 
6 QV4::QObjectWrapper::advanceIterator(QV4::Managed *, QV4::ObjectIterator *, QV4::Value *, unsigned int *, QV4::Property *, QV4::PropertyAttributes *) qv4qobjectwrapper.cpp 760 0x100c3326a 
7 QV4::Object::advanceIterator(QV4::ObjectIterator *, QV4::Value *, unsigned int *, QV4::Property *, QV4::PropertyAttributes *) qv4object_p.h 437 0x100b6cdac 
8 QV4::ObjectIterator::next(QV4::Value *, unsigned int *, QV4::Property *, QV4::PropertyAttributes *) qv4objectiterator.cpp 78 0x100b6cb05 
9 collectProperty(QV4::ScopedValue const&, QV4::ExecutionEngine *, QJsonObject&) qv4datacollector.cpp 173 0x110058334 
10 QV4DataCollector::collectAsJson(QString const&, QV4::ScopedValue const&) qv4datacollector.cpp 483 0x11005bbd7 
11 QV4DataCollector::collectProperties(QV4::Object const *) qv4datacollector.cpp 465 0x110059477 
12 QV4DataCollector::lookupRef(unsigned int, bool) qv4datacollector.cpp 221 0x110059052 
13 ExpressionEvalJob::handleResult(QV4::ScopedValue&) qv4debugjob.cpp 252 0x1100604f7 
14 JavaScriptJob::run() qv4debugjob.cpp 128 0x11005eb7c 
15 QV4Debugger::pauseAndWait(QV4Debugger::PauseReason) qv4debugger.cpp 285 0x110050475 
16 QV4Debugger::maybeBreakAtInstruction() qv4debugger.cpp 208 0x110050335 
17 QV4::Moth::VME::run(QV4::ExecutionEngine *, unsigned const char *) qv4vme_moth.cpp 924 0x100c59022 
18 QV4::Moth::VME::exec(QV4::ExecutionEngine *, unsigned const char *) qv4vme_moth.cpp 976 0x100c5a236 
19 QV4::ExecutionContext::call(QV4::Scope&, QV4::CallData *, QV4::Function *, QV4::FunctionObject const *) qv4context.cpp 274 0x100b0af46 
20 QQmlJavaScriptExpression::evaluate(QV4::CallData *, bool *, QV4::Scope&) qqmljavascriptexpression.cpp 225 0x100d46e14 
21 QQmlBoundSignalExpression::evaluate(void * *) qqmlboundsignal.cpp 223 0x100cabc4f 
22 QQmlBoundSignal_callback(QQmlNotifierEndpoint *, void * *) qqmlboundsignal.cpp 355 0x100cac3de 
23 QQmlNotifier::emitNotify(QQmlNotifierEndpoint *, void * *) qqmlnotifier.cpp 106 0x100d1ee5d 
24 QQmlData::signalEmitted(QAbstractDeclarativeData *, QObject *, int, void * *) qqmlengine.cpp 856 0x100c7cf23 
25 QMetaObject::activate(QObject *, int, int, void * *) qobject.cpp 3644 0x1017298be 
26 QMetaObject::activate(QObject *, QMetaObject const *, int, void * *) qobject.cpp 3629 0x1017297fd 
27 QQuickAbstractButton::clicked() moc_qquickabstractbutton_p.cpp 496 0x1031f6d95 
28 QQuickAbstractButtonPrivate::trigger() qquickabstractbutton.cpp 322 0x103150a4e 
29 QQuickAbstractButtonPrivate::handleRelease(QPointF const&) qquickabstractbutton.cpp 188 0x103150946 
30 QQuickControl::mouseReleaseEvent(QMouseEvent *) qquickcontrol.cpp 1525 0x10317fe79 
31 QQuickItem::event(QEvent *) qquickitem.cpp 7897 0x1003697a7 
32 QQuickAbstractButton::event(QEvent *) qquickabstractbutton.cpp 863 0x103153d2e 
33 QApplicationPrivate::notify_helper(QObject *, QEvent *) qapplication.cpp 3732 0x10276adbf 
34 QApplication::notify(QObject *, QEvent *) qapplication.cpp 3104 0x10276ce97 
35 QCoreApplication::notifyInternal2(QObject *, QEvent *) qcoreapplication.cpp 1050 0x1016d33b5 
36 QCoreApplication::sendEvent(QObject *, QEvent *) qcoreapplication.h 234 0x10033ca08 
37 QQuickWindowPrivate::deliverMouseEvent(QQuickPointerMouseEvent *) qquickwindow.cpp 1726 0x10038db91 
38 QQuickWindowPrivate::deliverPointerEvent(QQuickPointerEvent *) qquickwindow.cpp 2297 0x10038f6fb 
39 QQuickWindowPrivate::handleMouseEvent(QMouseEvent *) qquickwindow.cpp 2143 0x100390310 
40 QQuickWindow::mouseReleaseEvent(QMouseEvent *) qquickwindow.cpp 2123 0x10039076a 
41 QWindow::event(QEvent *) qwindow.cpp 2240 0x101d0028a 
42 QQuickWindow::event(QEvent *) qquickwindow.cpp 1620 0x10038bf39 
43 QApplicationPrivate::notify_helper(QObject *, QEvent *) qapplication.cpp 3732 0x10276adbf 
44 QApplication::notify(QObject *, QEvent *) qapplication.cpp 3104 0x10276ce97 
45 QCoreApplication::notifyInternal2(QObject *, QEvent *) qcoreapplication.cpp 1050 0x1016d33b5 
46 QCoreApplication::sendSpontaneousEvent(QObject *, QEvent *) qcoreapplication.h 237 0x101ceec5c 
47 QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent *) qguiapplication.cpp 1960 0x101cea5fd 
48 QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent *) qguiapplication.cpp 1741 0x101ce9626 
49 QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) qwindowsysteminterface.cpp 984 0x101cc6884 
50 QCocoaEventDispatcherPrivate::processPostedEvents() qcocoaeventdispatcher.mm 898 0x104c49db1 
51 QCocoaEventDispatcherPrivate::postedEventsSourceCallback(void *) qcocoaeventdispatcher.mm 919 0x104c4ac1f 
52 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ 0x7fff515e7721 
53 __CFRunLoopDoSource0 0x7fff516a10ac 
54 __CFRunLoopDoSources0 0x7fff515ca260 
55 __CFRunLoopRun 0x7fff515c96dd 
56 CFRunLoopRunSpecific 0x7fff515c8f43 
57 RunCurrentEventLoopInMode 0x7fff508e0e26 
58 ReceiveNextEventCommon 0x7fff508e0a9f 
59 _BlockUntilNextEventMatchingListInModeWithFilter 0x7fff508e0914 
60 _DPSNextEvent 0x7fff4ebabf5f 
61 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] 0x7fff4f341b4c 
62 -[NSApplication run] 0x7fff4eba0d6d 
63 QCocoaEventDispatcher::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) qcocoaeventdispatcher.mm 430 0x104c48a50 
64 QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) qeventloop.cpp 134 0x1016cd584 
65 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) qeventloop.cpp 212 0x1016cd79b 
66 QCoreApplication::exec() qcoreapplication.cpp 1338 0x1016d3cbc 
67 QGuiApplication::exec() qguiapplication.cpp 1687 0x101ce9366 
68 QApplication::exec() qapplication.cpp 2917 0x10276c759 
69 main main.cpp 296 0x1000064fb 
70 start 0x7fff78ee0115 

bool QQmlData::wasDeleted(const QObject *object)
{
    if (!object)
        return true;

    const QObjectPrivate *priv = QObjectPrivate::get(object);
>>> if (!priv || priv->wasDeleted)
        return true;

    const QQmlData *ddata = QQmlData::get(object);
    return ddata && ddata->isQueuedForDeletion;
}

inline ReturnedValue QObjectWrapper::wrap(ExecutionEngine *engine, QObject *object)
{
>>> if (Q_UNLIKELY(QQmlData::wasDeleted(object)))
        return QV4::Encode::null();

    auto ddata = QQmlData::get(object);
    if (Q_LIKELY(ddata && ddata->jsEngineId == engine->m_engineId && !ddata->jsWrapper.isUndefined())) {
        // We own the JS object
        return ddata->jsWrapper.value();
    }

    return wrap_slowPath(engine, object);
}

[...]
            case QMetaType::QRegExp:
                return QV4::Encode(newRegExpObject(*reinterpret_cast<const QRegExp *>(ptr)));
            case QMetaType::QObjectStar:
>>>             return QV4::QObjectWrapper::wrap(this, *reinterpret_cast<QObject* const *>(ptr));
            case QMetaType::QStringList:
                {
                bool succeeded = false;
                QV4::Scope scope(this);
                QV4::ScopedValue retn(scope, QV4::SequencePrototype::fromVariant(this, variant, &succeeded));
                if (succeeded)
                    return retn->asReturnedValue();
                return QV4::Encode(newArrayObject(*reinterpret_cast<const QStringList *>(ptr)));
                }

[...]

[...]
        return QJSValuePrivate::convertedToValue(v4, v);
    } else if (property.isQVariant()) {
        QVariant v;
        property.readProperty(object, &v);

        if (QQmlValueTypeFactory::isValueType(v.userType())) {
            if (const QMetaObject *valueTypeMetaObject = QQmlValueTypeFactory::metaObjectForMetaType(v.userType()))
                return QV4::QQmlValueTypeWrapper::create(v4, object, property.coreIndex(), valueTypeMetaObject, v.userType()); // VariantReference value-type.
        }

>>>     return scope.engine->fromVariant(v);
    } else if (QQmlValueTypeFactory::isValueType(property.propType())) {
        if (const QMetaObject *valueTypeMetaObject = QQmlValueTypeFactory::metaObjectForMetaType(property.propType()))
[...]