Aborting incubation may lead to a crash with some controls

==323861== Invalid read of size 8
==323861== at 0x671E637: load (atomic_base.h:747)
==323861== by 0x671E637: load (atomic:530)
==323861== by 0x671E637: loadRelaxed<QObjectPrivate::ConnectionData*> (qatomic_cxx11.h:201)
==323861== by 0x671E637: loadRelaxed (qbasicatomic.h:190)
==323861== by 0x671E637: QMetaObjectPrivate::disconnect(QObject const*, int, QMetaObject const*, QObject const*, int, void**, QMetaObjectPrivate::DisconnectType) (qobject.cpp:3582)
==323861== by 0x671ECC9: QObject::disconnectImpl(QObject const*, void**, QObject const*, void**, QMetaObject const*) (qobject.cpp:5231)
==323861== by 0x82A4936: disconnect<void (QQuickPopup::*)(), void (QQuickComboBoxPrivate::*)()> (qobject_p.h:339)
==323861== by 0x82A4936: QQuickComboBox::~QQuickComboBox() (qquickcombobox.cpp:939)
==323861== by 0x834CA24: ~QQmlElement (qqmlprivate.h:99)
==323861== by 0x834CA24: QQmlPrivate::QQmlElement<QQuickComboBox>::~QQmlElement() (qqmlprivate.h:99)
==323861== by 0x581CE77: QQmlObjectCreator::clear() (qqmlobjectcreator.cpp:1475)
==323861== by 0x57F0C17: QQmlIncubatorPrivate::clear() (qqmlincubator.cpp:139)
==323861== by 0x57F07B0: QQmlIncubator::clear() (qqmlincubator.cpp:550)
==323861== by 0x57F0C74: QQmlIncubatorPrivate::clear() (qqmlincubator.cpp:132)
==323861== by 0x57F07B0: QQmlIncubator::clear() (qqmlincubator.cpp:550)
==323861== by 0x402564: testIncubation(QQmlIncubationController&) (main.cpp:27)
==323861== by 0x40265C: main::{lambda()#1}::operator()() const (main.cpp:39)
==323861== by 0x4029D6: QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, main::{lambda()#1}>::call(main::{lambda()#1}&, void**) (qobjectdefs_impl.h:127)
==323861== Address 0x211e6078 is 8 bytes inside a block of size 216 free'd
==323861== at 0x4C3B021: operator delete(void*) (vg_replace_malloc.c:923)
==323861== by 0x581CE77: QQmlObjectCreator::clear() (qqmlobjectcreator.cpp:1475)
==323861== by 0x57F0C17: QQmlIncubatorPrivate::clear() (qqmlincubator.cpp:139)
==323861== by 0x57F07B0: QQmlIncubator::clear() (qqmlincubator.cpp:550)
==323861== by 0x57F0C74: QQmlIncubatorPrivate::clear() (qqmlincubator.cpp:132)
==323861== by 0x57F07B0: QQmlIncubator::clear() (qqmlincubator.cpp:550)
==323861== by 0x402564: testIncubation(QQmlIncubationController&) (main.cpp:27)
==323861== by 0x40265C: main::{lambda()#1}::operator()() const (main.cpp:39)
==323861== by 0x4029D6: QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, main::{lambda()#1}>::call(main::{lambda()#1}&, void**) (qobjectdefs_impl.h:127)
==323861== by 0x4029B7: void QtPrivate::Functor<main::{lambda()#1}, 0>::call<QtPrivate::List<>, void>(main::{lambda()#1}&, void*, void**) (qobjectdefs_impl.h:241)
==323861== by 0x402985: QtPrivate::QFunctorSlotObject<main::{lambda()#1}, 0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) (qobjectdefs_impl.h:408)
==323861== by 0x67367A4: call (qobjectdefs_impl.h:363)
==323861== by 0x67367A4: QSingleShotTimer::timerEvent(QTimerEvent*) (qtimer.cpp:307)
==323861== Block was alloc'd at
==323861== at 0x4C388C3: operator new(unsigned long) (vg_replace_malloc.c:422)
==323861== by 0x586EBA5: create (qqmltype.cpp:478)
==323861== by 0x586EBA5: QQmlType::create(void**, unsigned long) const (qqmltype.cpp:471)
==323861== by 0x5823C1F: QQmlObjectCreator::createInstance(int, QObject*, bool) (qqmlobjectcreator.cpp:1186)
==323861== by 0x58247AA: QQmlObjectCreator::create(int, QObject*, QQmlInstantiationInterrupt*, int) (qqmlobjectcreator.cpp:184)
==323861== by 0x5823889: QQmlObjectCreator::createInstance(int, QObject*, bool) (qqmlobjectcreator.cpp:1232)
==323861== by 0x58259C5: QQmlObjectCreator::setPropertyBinding(QQmlPropertyData const*, QV4::CompiledData::Binding const*) (qqmlobjectcreator.cpp:780)
==323861== by 0x582758D: QQmlObjectCreator::setupBindings(QFlags<QQmlObjectCreator::BindingMode>) (qqmlobjectcreator.cpp:721)
==323861== by 0x58217CA: QQmlObjectCreator::populateInstance(int, QObject*, QObject*, QQmlPropertyData const*, QV4::CompiledData::Binding const*) (qqmlobjectcreator.cpp:1646)
==323861== by 0x582358C: QQmlObjectCreator::createInstance(int, QObject*, bool) (qqmlobjectcreator.cpp:1332)
==323861== by 0x58247AA: QQmlObjectCreator::create(int, QObject*, QQmlInstantiationInterrupt*, int) (qqmlobjectcreator.cpp:184)
==323861== by 0x57F1458: QQmlIncubatorPrivate::incubate(QQmlInstantiationInterrupt&) (qqmlincubator.cpp:263)
==323861== by 0x57F215D: QQmlIncubationController::incubateFor(int) (qqmlincubator.cpp:373)