Qt 5.6 regression: ASSERT: "!(mm_data & MarkBit)"

#6  0x00007ffff63299de in qt_assert (assertion=assertion@entry=0x7ffff7243f6b "!(mm_data & MarkBit)", 
    file=file@entry=0x7ffff7237f70 "../../include/QtQml/5.6.0/QtQml/private/../../../../../../../../../sources/qt/qt5/qtdeclarative/src/qml/memory/qv4heap_p.h", line=line@entry=86)
    at /data/sources/qt/qt5/qtbase/src/corelib/global/qglobal.cpp:3044
#7  0x00007ffff70d9d45 in QV4::Heap::Base::setVtable (v=<optimized out>, this=0x7fffffffd2c0)
    at ../../include/QtQml/5.6.0/QtQml/private/../../../../../../../../../sources/qt/qt5/qtdeclarative/src/qml/memory/qv4heap_p.h:86
#8  QV4::SimpleScriptFunction::call (that=0x7fffe8521248, callData=0x7fffe87c0320) at /data/sources/qt/qt5/qtdeclarative/src/qml/jsruntime/qv4functionobject.cpp:567
#9  0x00007ffff71c6cde in QV4::Object::call (d=0x7fffe87c0320, this=0x7fffe8521248)
    at ../../include/QtQml/5.6.0/QtQml/private/../../../../../../../../../sources/qt/qt5/qtdeclarative/src/qml/jsruntime/qv4object_p.h:324
#10 QQmlJavaScriptExpression::evaluate (this=this@entry=0xb0d060, callData=callData@entry=0x7fffe87c0320, isUndefined=isUndefined@entry=0x7fffffffd4b0)
    at /data/sources/qt/qt5/qtdeclarative/src/qml/qml/qqmljavascriptexpression.cpp:189
#11 0x00007ffff71c74c1 in QQmlJavaScriptExpression::evaluate (this=this@entry=0xb0d060, isUndefined=isUndefined@entry=0x7fffffffd4b0)
    at /data/sources/qt/qt5/qtdeclarative/src/qml/qml/qqmljavascriptexpression.cpp:149
#12 0x00007ffff71cf86a in QQmlBinding::update (this=0xb0d060, flags=...) at /data/sources/qt/qt5/qtdeclarative/src/qml/qml/qqmlbinding.cpp:187
#13 0x00007ffff71d96b8 in QQmlObjectCreator::finalize (this=0x9c0230, interrupt=...) at /data/sources/qt/qt5/qtdeclarative/src/qml/qml/qqmlobjectcreator.cpp:1191
#14 0x00007ffff7163052 in QQmlComponentPrivate::complete (enginePriv=0x7f9f50, state=0x9c9c90) at /data/sources/qt/qt5/qtdeclarative/src/qml/qml/qqmlcomponent.cpp:912
#15 0x00007ffff7163109 in QQmlComponentPrivate::completeCreate (this=0x9c9bf0) at /data/sources/qt/qt5/qtdeclarative/src/qml/qml/qqmlcomponent.cpp:948
#16 0x00007ffff7162fc0 in QQmlComponent::create (this=0xafeb60, context=0x8b46b0) at /data/sources/qt/qt5/qtdeclarative/src/qml/qml/qqmlcomponent.cpp:774
#17 0x0000000000472b00 in QuickView::createStyleComponent() ()
#18 0x00000000004718f4 in QuickView::QuickView(Kernel*) ()
#19 0x0000000000474574 in main ()