davidedmundson added a comment.
My valgrind, using your test instructions is showing it is. at 0x75B5D3C: texture (qsgtexturematerial.h:58) by 0x75B5D3C: QSGSimpleTextureNode::texture() const (qsgsimpletexturenode.cpp:264) by 0x26044983: Plotter::render() (plotter.cpp:699) by 0x2604BFFF: QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, void (Plotter::*)()>::call(void (Plotter::*)(), Plotter*, void**) (qobjectdefs_impl.h:136) by 0x2604BE22: void QtPrivate::FunctionPointer<void (Plotter::*)()>::call<QtPrivate::List<>, void>(void (Plotter::*)(), Plotter*, void**) (qobjectdefs_impl.h:169) by 0x2604B08C: QtPrivate::QSlotObject<void (Plotter::*)(), QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) (qobjectdefs_impl.h:398) by 0xB8E1E86: call (qobjectdefs_impl.h:378) by 0xB8E1E86: QMetaObject::activate(QObject*, int, int, void**) (qobject.cpp:3749) by 0xB8E236A: QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (qobject.cpp:3628) by 0x764EC91: QQuickWindow::beforeRendering() (moc_qquickwindow.cpp:497) by 0x765202F: QQuickWindowPrivate::renderSceneGraph(QSize const&) (qquickwindow.cpp:452) by 0x75EE216: QSGRenderThread::syncAndRender() (qsgthreadedrenderloop.cpp:645) by 0x75F2EC0: QSGRenderThread::run() (qsgthreadedrenderloop.cpp:729) by 0xB6DF681: QThreadPrivate::start(void*) (qthread_unix.cpp:376) Address 0x25699360 is 336 bytes inside a block of size 400 free'd at 0x4C2E64B: operator delete(void*) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) by 0x5099B29: ManagedTextureNode::~ManagedTextureNode() (managedtexturenode.h:45) by 0x7597A3E: QSGNode::destroy() (qsgnode.cpp:390) by 0x7597AE1: QSGNode::~QSGNode() (qsgnode.cpp:328) by 0x7597C64: QSGTransformNode::~QSGTransformNode() (qsgnode.cpp:1185) by 0x7597C72: QSGTransformNode::~QSGTransformNode() (qsgnode.cpp:1187) by 0x7651EEE: QQuickWindowPrivate::cleanupNodes() (qquickwindow.cpp:3080) At which point after this patch we'll still be reading a QPointer in deleted memory, as that ManagedTextureNode is our m_node. REPOSITORY R296 KDeclarative REVISION DETAIL https://phabricator.kde.org/D10250 To: mart, #plasma, davidedmundson Cc: davidedmundson, broulik, ngraham, plasma-devel, #frameworks, michaelh, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart