Application: kwin_x11 (5.8.4)

Qt Version: 5.7.0
Frameworks Version: 5.27.0
Operating System: Linux 4.8.13-300.fc25.x86_64 x86_64
Distribution: "Fedora release 25 (Twenty Five)"

-- Information about the crash:
- What I was doing when the application crashed:
Using NVidia proprietary driver on Fedora 25:
1-Launched a full screen Qt Quick app
2-Tried to change active app with Alt+tab
3-No change, click full screen Qt Quick app
4-Press Ctrl+Alt+F2, then Ctrl+Alt+F1 brings back plasma taskbar with KWin crash

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f55da716440 (LWP 4994))]

Thread 6 (Thread 0x7f55cb5ef700 (LWP 9804)):
[KCrash Handler]
#6  0x00007f55bd42a9f5 in  () at /lib64/libnvidia-glcore.so.375.20
#7  0x00007f55bd824b16 in  () at /lib64/libnvidia-glcore.so.375.20
#8  0x00007f55bd95aeb6 in  () at /lib64/libnvidia-glcore.so.375.20
#9  0x00007f55bd5cea9b in  () at /lib64/libnvidia-glcore.so.375.20
#10 0x00007f55bd590e6c in  () at /lib64/libnvidia-glcore.so.375.20
#11 0x00007f55eae80f35 in QOpenGLShaderProgram::link() () at /lib64/libQt5Gui.so.5
#12 0x00007f55eae9f177 in QOpenGLTextureGlyphCache::resizeTextureData(int, int) () at /lib64/libQt5Gui.so.5
#13 0x00007f55eae47392 in QTextureGlyphCache::fillInPendingGlyphs() () at /lib64/libQt5Gui.so.5
#14 0x00007f55f18c1488 in QSGTextMaskMaterial::populate(QPointF const&, QVector<unsigned int> const&, QVector<QPointF> const&, QSGGeometry*, QRectF*, QPointF*, QMargins const&) () at /lib64/libQt5Quick.so.5
#15 0x00007f55f18bf334 in QSGDefaultGlyphNode::update() () at /lib64/libQt5Quick.so.5
#16 0x00007f55f1946767 in QQuickTextNode::addGlyphs(QPointF const&, QGlyphRun const&, QColor const&, QQuickText::TextStyle, QColor const&, QSGNode*) () at /lib64/libQt5Quick.so.5
#17 0x00007f55f194b3b4 in QQuickTextNodeEngine::addToSceneGraph(QQuickTextNode*, QQuickText::TextStyle, QColor const&) () at /lib64/libQt5Quick.so.5
#18 0x00007f55f194768c in QQuickTextNode::addTextLayout(QPointF const&, QTextLayout*, QColor const&, QQuickText::TextStyle, QColor const&, QColor const&, QColor const&, QColor const&, int, int, int, int) () at /lib64/libQt5Quick.so.5
#19 0x00007f55f194614a in QQuickText::updatePaintNode(QSGNode*, QQuickItem::UpdatePaintNodeData*) () at /lib64/libQt5Quick.so.5
#20 0x00007f55f1903880 in QQuickWindowPrivate::updateDirtyNode(QQuickItem*) () at /lib64/libQt5Quick.so.5
#21 0x00007f55f190409b in QQuickWindowPrivate::updateDirtyNodes() () at /lib64/libQt5Quick.so.5
#22 0x00007f55f190510e in QQuickWindowPrivate::syncSceneGraph() () at /lib64/libQt5Quick.so.5
#23 0x00007f55f18d44c5 in QSGRenderThread::sync(bool) () at /lib64/libQt5Quick.so.5
#24 0x00007f55f18d615c in QSGRenderThread::syncAndRender() () at /lib64/libQt5Quick.so.5
#25 0x00007f55f18da26c in QSGRenderThread::run() () at /lib64/libQt5Quick.so.5
#26 0x00007f55ea730a4a in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#27 0x00007f55ec92e6ca in start_thread () at /lib64/libpthread.so.0
#28 0x00007f55e9b23f6f in clone () at /lib64/libc.so.6

Thread 5 (Thread 0x7f55c9ded700 (LWP 5305)):
#0  0x00007f55ec934460 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f55f21b6bd4 in QTWTF::TCMalloc_PageHeap::scavengerThread() () at /lib64/libQt5Script.so.5
#2  0x00007f55f21b6c19 in  () at /lib64/libQt5Script.so.5
#3  0x00007f55ec92e6ca in start_thread () at /lib64/libpthread.so.0
#4  0x00007f55e9b23f6f in clone () at /lib64/libc.so.6

Thread 4 (Thread 0x7f55cadee700 (LWP 5270)):
#0  0x00007f55e9b180d1 in ppoll () at /lib64/libc.so.6
#1  0x00007f55ea91a111 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /lib64/libQt5Core.so.5
#2  0x00007f55ea91b626 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#3  0x00007f55ea8cf16a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#4  0x00007f55ea72c673 in QThread::exec() () at /lib64/libQt5Core.so.5
#5  0x00007f55f140e735 in QQmlThreadPrivate::run() () at /lib64/libQt5Qml.so.5
#6  0x00007f55ea730a4a in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#7  0x00007f55ec92e6ca in start_thread () at /lib64/libpthread.so.0
#8  0x00007f55e9b23f6f in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7f55d153a700 (LWP 5122)):
#0  0x00007f55e9b180d1 in ppoll () at /lib64/libc.so.6
#1  0x00007f55ea91a111 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /lib64/libQt5Core.so.5
#2  0x00007f55ea91b626 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#3  0x00007f55ea8cf16a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#4  0x00007f55ea72c673 in QThread::exec() () at /lib64/libQt5Core.so.5
#5  0x00007f55ec44b7a9 in QDBusConnectionManager::run() () at /lib64/libQt5DBus.so.5
#6  0x00007f55ea730a4a in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#7  0x00007f55ec92e6ca in start_thread () at /lib64/libpthread.so.0
#8  0x00007f55e9b23f6f in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f55d2c53700 (LWP 5113)):
#0  0x00007f55e9b1800d in poll () at /lib64/libc.so.6
#1  0x00007f55ec219d10 in _xcb_conn_wait () at /lib64/libxcb.so.1
#2  0x00007f55ec21baa9 in xcb_wait_for_event () at /lib64/libxcb.so.1
#3  0x00007f55d3b2da19 in QXcbEventReader::run() () at /lib64/libQt5XcbQpa.so.5
#4  0x00007f55ea730a4a in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#5  0x00007f55ec92e6ca in start_thread () at /lib64/libpthread.so.0
#6  0x00007f55e9b23f6f in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f55da716440 (LWP 4994)):
#0  0x00007f55ec934460 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f55ea7310ca in QWaitCondition::wait(QMutex*, unsigned long) () at /lib64/libQt5Core.so.5
#2  0x00007f55f18d6e08 in QSGThreadedRenderLoop::polishAndSync(QSGThreadedRenderLoop::Window*, bool) () at /lib64/libQt5Quick.so.5
#3  0x00007f55f18d8eff in QSGThreadedRenderLoop::handleExposure(QQuickWindow*) () at /lib64/libQt5Quick.so.5
#4  0x00007f55f18d951b in QSGThreadedRenderLoop::exposureChanged(QQuickWindow*) () at /lib64/libQt5Quick.so.5
#5  0x00007f55eac1c2c5 in QWindow::event(QEvent*) () at /lib64/libQt5Gui.so.5
#6  0x00007f55f190f1b3 in QQuickWindow::event(QEvent*) () at /lib64/libQt5Quick.so.5
#7  0x00007f55bf1e389b in PlasmaQuick::Dialog::event(QEvent*) () at /lib64/libKF5PlasmaQuick.so.5
#8  0x00007f55eb11a96c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#9  0x00007f55eb122111 in QApplication::notify(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#10 0x00007f55ea8d01da in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib64/libQt5Core.so.5
#11 0x00007f55eac11d2d in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) () at /lib64/libQt5Gui.so.5
#12 0x00007f55eac1295d in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () at /lib64/libQt5Gui.so.5
#13 0x00007f55eabf37cb in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Gui.so.5
#14 0x00007f55d3ba67f6 in QUnixEventDispatcherQPA::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5XcbQpa.so.5
#15 0x00007f55ea8cf16a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#16 0x00007f55ea8d6c6c in QCoreApplication::exec() () at /lib64/libQt5Core.so.5
#17 0x00007f55f2ed80b6 in kdemain () at /lib64/libkdeinit5_kwin_x11.so
#18 0x00007f55e9a3c401 in __libc_start_main () at /lib64/libc.so.6
#19 0x0000560867e51cca in _start ()

Reported using DrKonqi