Abort hit when deleting a QtQuick scene from a MouseArea signal handler

When the handling of MouseArea results in the deconstruction of the QtQuick scene this results in an abort. We noticed that in context of KDE bug 346857 (https://bugs.kde.org/show_bug.cgi?id=346857)

A simplified example application can be found at: git://anongit.kde.org/scratch/graesslin/mouse-area-close-crash - if needed I can also attach it as a tar-gz. If wanted I can also turn this into an auto test to be included in Qt.

The stacktrace of the abort (application run with QV4_NO_SSA=1 QV4_NO_OPT=1 QV4_FORCE_INTERPRETER=1 QML_DISABLE_OPTIMIZER=1):

#0 0x00007ffff50fd107 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1 0x00007ffff50fe4e8 in __GI_abort () at abort.c:89
#2 0x00007ffff5de8291 in qt_message_fatal (context=..., message=...) at global/qlogging.cpp:1578
#3 0x00007ffff5de495c in QMessageLogger::fatal (this=0x7fffffff8ca0, msg=0x7ffff6104270 "ASSERT: \"%s\" in file %s, line %d") at global/qlogging.cpp:781
#4 0x00007ffff5dddb90 in qt_assert (assertion=0x7ffff67df129 "context() && engine()", file=0x7ffff67df0e4 "qml/qqmlboundsignal.cpp", line=183) at global/qglobal.cpp:2966
#5 0x00007ffff6667fe7 in QQmlBoundSignalExpression::function (this=0xf56080) at qml/qqmlboundsignal.cpp:183
#6 0x00007ffff6667d4c in QQmlBoundSignalExpression::sourceLocation (this=0xf56080) at qml/qqmlboundsignal.cpp:155
#7 0x00007ffff663f1fb in QQmlData::destroyed (this=0x873d90, object=0xf54eb0) at qml/qqmlengine.cpp:1709
#8 0x00007ffff663cf6b in QQmlData::destroyed (d=0x873d90, o=0xf54eb0) at qml/qqmlengine.cpp:674
#9 0x00007ffff605c6e9 in QObject::~QObject (this=0xf54eb0, __in_chrg=<optimized out>) at kernel/qobject.cpp:912
#10 0x00007ffff7265df9 in QQuickItem::~QQuickItem (this=0xf54eb0, __in_chrg=<optimized out>) at items/qquickitem.cpp:2224
#11 0x00007ffff7324866 in QQuickMouseArea::~QQuickMouseArea (this=0xf54eb0, __in_chrg=<optimized out>) at items/qquickmousearea.cpp:439
#12 0x00007ffff72d69c5 in QQmlPrivate::QQmlElement<QQuickMouseArea>::~QQmlElement (this=0xf54eb0, __in_chrg=<optimized out>) at ../../include/QtQml/../../src/qml/qml/qqmlprivate.h:98
#13 0x00007ffff72d69fa in QQmlPrivate::QQmlElement<QQuickMouseArea>::~QQmlElement (this=0xf54eb0, __in_chrg=<optimized out>) at ../../include/QtQml/../../src/qml/qml/qqmlprivate.h:98
#14 0x00007ffff605e516 in QObjectPrivate::deleteChildren (this=0xf54c90) at kernel/qobject.cpp:1946
#15 0x00007ffff605cb80 in QObject::~QObject (this=0xf56050, __in_chrg=<optimized out>) at kernel/qobject.cpp:1024
#16 0x00007ffff7265df9 in QQuickItem::~QQuickItem (this=0xf56050, __in_chrg=<optimized out>) at items/qquickitem.cpp:2224
#17 0x00007ffff72c3e22 in QQuickRectangle::~QQuickRectangle (this=0xf56050, __in_chrg=<optimized out>) at items/qquickrectangle_p.h:128
#18 0x00007ffff72d6357 in QQmlPrivate::QQmlElement<QQuickRectangle>::~QQmlElement (this=0xf56050, __in_chrg=<optimized out>) at ../../include/QtQml/../../src/qml/qml/qqmlprivate.h:98
#19 0x00007ffff72d638c in QQmlPrivate::QQmlElement<QQuickRectangle>::~QQmlElement (this=0xf56050, __in_chrg=<optimized out>) at ../../include/QtQml/../../src/qml/qml/qqmlprivate.h:98
#20 0x00007ffff736a976 in QQuickView::~QQuickView (this=0x6b1980, __in_chrg=<optimized out>) at items/qquickview.cpp:225
#21 0x00007ffff736a9d2 in QQuickView::~QQuickView (this=0x6b1980, __in_chrg=<optimized out>) at items/qquickview.cpp:227
#22 0x0000000000402200 in Helper::close() ()
#23 0x0000000000401d35 in Helper::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) ()
#24 0x0000000000401e2e in Helper::qt_metacall(QMetaObject::Call, int, void**) ()
#25 0x00007ffff602dd01 in QMetaObject::metacall (object=0x7fffffffdcf0, cl=QMetaObject::InvokeMetaMethod, idx=5, argv=0x7fffffff9630) at kernel/qmetaobject.cpp:296
#26 0x00007ffff66aea54 in QQmlObjectOrGadget::metacall (this=0x7fffffff9890, type=QMetaObject::InvokeMetaMethod, index=5, argv=0x7fffffff9630) at qml/qqmlpropertycache.cpp:1689
#27 0x00007ffff6601518 in CallMethod (object=..., index=5, returnType=43, argCount=0, argTypes=0x0, engine=0xe36bd0, callArgs=0x7fffd78010a8) at jsruntime/qv4qobjectwrapper.cpp:1173
#28 0x00007ffff6601ef1 in CallPrecise (object=..., data=..., engine=0xe36bd0, callArgs=0x7fffd78010a8) at jsruntime/qv4qobjectwrapper.cpp:1408
#29 0x00007ffff6604697 in QV4::QObjectMethod::callInternal (this=0x7fffd78010f8, callData=0x7fffd78010a8) at jsruntime/qv4qobjectwrapper.cpp:1893
#30 0x00007ffff6604089 in QV4::QObjectMethod::call (m=0x7fffd78010f8, callData=0x7fffd78010a8) at jsruntime/qv4qobjectwrapper.cpp:1828
#31 0x00007ffff64d5e14 in QV4::Object::call (this=0x7fffd78010f8, d=0x7fffd78010a8) at ../../include/QtQml/5.5.1/QtQml/private/../../../../../src/qml/jsruntime/qv4object_p.h:305
#32 0x00007ffff6620a16 in QV4::Runtime::callProperty (engine=0xe36bd0, nameIndex=17, callData=0x7fffd78010a8) at jsruntime/qv4runtime.cpp:977
#33 0x00007ffff660ccf6 in QV4::Moth::VME::run (this=0x7fffffffa287, engine=0xe36bd0, code=0x7fffd80431e0 "\220\377`\366\377\177", storeJumpTable=0x0) at jsruntime/qv4vme_moth.cpp:556
#34 0x00007ffff6610656 in QV4::Moth::VME::exec (engine=0xe36bd0, code=0x7fffd8043128 "\366\311`\366\377\177") at jsruntime/qv4vme_moth.cpp:925
#35 0x00007ffff659aeb3 in QV4::SimpleScriptFunction::call (that=0x7fffd7801000, callData=0x7fffd7801008) at jsruntime/qv4functionobject.cpp:564
#36 0x00007ffff64d5e14 in QV4::Object::call (this=0x7fffd7801000, d=0x7fffd7801008) at ../../include/QtQml/5.5.1/QtQml/private/../../../../../src/qml/jsruntime/qv4object_p.h:305
#37 0x00007ffff66d5cac in QQmlJavaScriptExpression::evaluate (this=0xf560a0, context=0xf55f90, function=..., callData=0x7fffd7801008, isUndefined=0x0) at qml/qqmljavascriptexpression.cpp:158
#38 0x00007ffff6668ba0 in QQmlBoundSignalExpression::evaluate (this=0xf56080, a=0x7fffffffc270) at qml/qqmlboundsignal.cpp:281
#39 0x00007ffff66691ed in QQmlBoundSignal_callback (e=0x7a1b28, a=0x7fffffffc270) at qml/qqmlboundsignal.cpp:408
#40 0x00007ffff66b4d0f in QQmlNotifier::emitNotify (endpoint=0x0, a=0x7fffffffc270) at qml/qqmlnotifier.cpp:94
#41 0x00007ffff663d3f6 in QQmlData::signalEmitted (object=0xf54eb0, index=45, a=0x7fffffffc270) at qml/qqmlengine.cpp:763
#42 0x00007ffff606331e in QMetaObject::activate (sender=0xf54eb0, signalOffset=29, local_signal_index=16, argv=0x7fffffffc270) at kernel/qobject.cpp:3599
#43 0x00007ffff6063120 in QMetaObject::activate (sender=0xf54eb0, m=0x7ffff75c4600 <QQuickMouseArea::staticMetaObject>, local_signal_index=16, argv=0x7fffffffc270) at kernel/qobject.cpp:3578
#44 0x00007ffff741afd5 in QQuickMouseArea::clicked (this=0xf54eb0, _t1=0x7fffffffc2b0) at .moc/moc_qquickmousearea_p.cpp:617
#45 0x00007ffff732711a in QQuickMouseArea::setPressed (this=0xf54eb0, button=Qt::LeftButton, p=false) at items/qquickmousearea.cpp:1193
#46 0x00007ffff7325805 in QQuickMouseArea::mouseReleaseEvent (this=0xf54eb0, event=0x254caf0) at items/qquickmousearea.cpp:774
#47 0x00007ffff7272cf9 in QQuickItem::event (this=0xf54eb0, ev=0x254caf0) at items/qquickitem.cpp:7289
#48 0x00007ffff7749616 in QApplicationPrivate::notify_helper (this=0x61b210, receiver=0xf54eb0, e=0x254caf0) at kernel/qapplication.cpp:3716
#49 0x00007ffff7746d75 in QApplication::notify (this=0x7fffffffdd10, receiver=0xf54eb0, e=0x254caf0) at kernel/qapplication.cpp:3160
#50 0x00007ffff6024f9e in QCoreApplication::notifyInternal (this=0x7fffffffdd10, receiver=0xf54eb0, event=0x254caf0) at kernel/qcoreapplication.cpp:965
#51 0x00007ffff7277067 in QCoreApplication::sendEvent (receiver=0xf54eb0, event=0x254caf0) at /home/martin/src/qt5/qtbase/include/QtCore/../../src/corelib/kernel/qcoreapplication.h:224
#52 0x00007ffff728ff00 in QQuickWindow::sendEvent (this=0x6b1980, item=0xf54eb0, e=0x254caf0) at items/qquickwindow.cpp:2608
#53 0x00007ffff728989e in QQuickWindowPrivate::deliverMouseEvent (this=0x6b5f20, event=0x7fffffffd700) at items/qquickwindow.cpp:1532
#54 0x00007ffff7289ced in QQuickWindow::mouseReleaseEvent (this=0x6b1980, event=0x7fffffffd700) at items/qquickwindow.cpp:1572
#55 0x00007ffff736bef4 in QQuickView::mouseReleaseEvent (this=0x6b1980, e=0x7fffffffd700) at items/qquickview.cpp:627
#56 0x00007ffff6a95ea2 in QWindow::event (this=0x6b1980, ev=0x7fffffffd700) at kernel/qwindow.cpp:1966
#57 0x00007ffff7289061 in QQuickWindow::event (this=0x6b1980, e=0x7fffffffd700) at items/qquickwindow.cpp:1413
#58 0x00007ffff7749616 in QApplicationPrivate::notify_helper (this=0x61b210, receiver=0x6b1980, e=0x7fffffffd700) at kernel/qapplication.cpp:3716
#59 0x00007ffff7746d75 in QApplication::notify (this=0x7fffffffdd10, receiver=0x6b1980, e=0x7fffffffd700) at kernel/qapplication.cpp:3160
#60 0x00007ffff6024f9e in QCoreApplication::notifyInternal (this=0x7fffffffdd10, receiver=0x6b1980, event=0x7fffffffd700) at kernel/qcoreapplication.cpp:965
#61 0x00007ffff6a8cee9 in QCoreApplication::sendSpontaneousEvent (receiver=0x6b1980, event=0x7fffffffd700) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:227
#62 0x00007ffff6a85ff0 in QGuiApplicationPrivate::processMouseEvent (e=0x2559870) at kernel/qguiapplication.cpp:1789
#63 0x00007ffff6a8558a in QGuiApplicationPrivate::processWindowSystemEvent (e=0x2559870) at kernel/qguiapplication.cpp:1581
#64 0x00007ffff6a6dc65 in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:625
#65 0x00007fffeed5cd42 in userEventSourceDispatch (source=0x67e270) at eventdispatchers/qeventdispatcher_glib.cpp:70
#66 0x00007ffff19ecfe7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#67 0x00007ffff19ed240 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#68 0x00007ffff19ed2ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#69 0x00007ffff609b0d9 in QEventDispatcherGlib::processEvents (this=0x67f960, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#70 0x00007fffeed5cf66 in QPAEventDispatcherGlib::processEvents (this=0x67f960, flags=...) at eventdispatchers/qeventdispatcher_glib.cpp:115
#71 0x00007ffff6021b5c in QEventLoop::processEvents (this=0x7fffffffdc30, flags=...) at kernel/qeventloop.cpp:128
#72 0x00007ffff6021e50 in QEventLoop::exec (this=0x7fffffffdc30, flags=...) at kernel/qeventloop.cpp:204
#73 0x00007ffff602567c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#74 0x00007ffff6a853ba in QGuiApplication::exec () at kernel/qguiapplication.cpp:1527
#75 0x00007ffff774674f in QApplication::exec () at kernel/qapplication.cpp:2976
#76 0x0000000000401cab in main ()