Regression: setting cached to true on DropShadow causes random crashes

import QtQuick 2.2
import QtQuick.Controls 1.1
import QtGraphicalEffects 1.0

ApplicationWindow {
    id: window
    visible: true
    color: "black"
    width: 450
    height: 600

    Item {
        id: dummy
        anchors.fill: parent
    }

    DropShadow {
        id: shadow
        source: dummy
        color: "red"
        radius: 8
        samples: Math.min(32, radius)
        cached: true
        anchors.fill: dummy
    }
}

0	QSGNode::markDirty	qsgnode.cpp	665	0x7ffff7a12324	
1	QSGDefaultLayer::markDirtyTexture	qsgdefaultlayer.cpp	280	0x7ffff7a61f75	
2	QSGLayer::customEvent	qsgadaptationlayer.cpp	357	0x7ffff7a2ac63	
3	QObject::event	qobject.cpp	1271	0x7ffff605f0c2	
4	QApplicationPrivate::notify_helper	qapplication.cpp	3720	0x7ffff72068dc	
5	QApplication::notify	qapplication.cpp	3172	0x7ffff7203eaa	
6	QCoreApplication::notifyInternal	qcoreapplication.cpp	940	0x7ffff60227f6	
7	QCoreApplication::sendEvent	qcoreapplication.h	236	0x7ffff6026343	
8	QCoreApplicationPrivate::sendPostedEvents	qcoreapplication.cpp	1544	0x7ffff6023ac1	
9	QCoreApplication::sendPostedEvents	qcoreapplication.cpp	1402	0x7ffff6023466	
10	postEventSourceDispatch	qeventdispatcher_glib.cpp	279	0x7ffff609a14c	
11	g_main_context_dispatch	/lib/x86_64-linux-gnu/libglib-2.0.so.0		0x7ffff4386e04	
12	??	/lib/x86_64-linux-gnu/libglib-2.0.so.0		0x7ffff4387048	
13	g_main_context_iteration	/lib/x86_64-linux-gnu/libglib-2.0.so.0		0x7ffff43870ec	
14	QEventDispatcherGlib::processEvents	qeventdispatcher_glib.cpp	426	0x7ffff609a8ed	
15	QPAEventDispatcherGlib::processEvents	qeventdispatcher_glib.cpp	123	0x7ffff150d786	
16	QEventLoop::processEvents	qeventloop.cpp	136	0x7ffff601f508	
17	QEventLoop::exec	qeventloop.cpp	212	0x7ffff601f7c9	
18	QCoreApplication::exec	qcoreapplication.cpp	1193	0x7ffff6022eae	
19	QGuiApplication::exec	qguiapplication.cpp	1515	0x7ffff6acab24	
20	QApplication::exec	qapplication.cpp	2964	0x7ffff72036cb	
...	<More>