Application: kwin_x11 (5.10.3)

Qt Version: 5.9.0
Frameworks Version: 5.35.0
Operating System: Linux 4.11.8-1-ck-piledriver x86_64
Distribution: "Arch Linux"

-- Information about the crash:
- What I was doing when the application crashed:
Kwin compositor keeps crashing, mostly (2 times now) but cannot reproduce it all the time, was when opening steam Store window. Desktop freezes for couple of seconds and then shows the "crash reporting assistant" and you see that desktop effects are disabled. 

I need to go to compositor settings and re-enable and then restart kwin to bring it back.

-- Backtrace:
Application: KWin (kwin_x11), signal: Aborted
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f68f7d76840 (LWP 730))]

Thread 7 (Thread 0x7f68d5cba700 (LWP 1609)):
[KCrash Handler]
#5  0x00007f68f7716670 in raise () at /usr/lib/libc.so.6
#6  0x00007f68f7717d00 in abort () at /usr/lib/libc.so.6
#7  0x00007f68f4b79807 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f68d712da23 in  () at /usr/lib/qt/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#9  0x00007f68f4d9757f in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#10 0x00007f68f4e14767 in QTimer::timeout(QTimer::QPrivateSignal) () at /usr/lib/libQt5Core.so.5
#11 0x00007f68f4da4008 in QTimer::timerEvent(QTimerEvent*) () at /usr/lib/libQt5Core.so.5
#12 0x00007f68f4d97e2b in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#13 0x00007f68f5a9746c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#14 0x00007f68f5a9ecf4 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#15 0x00007f68f4d68b98 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#16 0x00007f68f4dbfbae in QTimerInfoList::activateTimers() () at /usr/lib/libQt5Core.so.5
#17 0x00007f68f4dbddc2 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#18 0x00007f68f4d6721a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#19 0x00007f68f4b8940a in QThread::exec() () at /usr/lib/libQt5Core.so.5
#20 0x00007f68f4b8dcbd in  () at /usr/lib/libQt5Core.so.5
#21 0x00007f68f0902297 in start_thread () at /usr/lib/libpthread.so.0
#22 0x00007f68f77d01ef in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f68c4a27700 (LWP 1608)):
#0  0x00007f68f090839d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f68f4b8f0eb in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f68f4b87f7b in QSemaphore::acquire(int) () at /usr/lib/libQt5Core.so.5
#3  0x00007f68bebc582c in  () at /usr/lib/qt/plugins/texttospeech/libqttexttospeech_flite.so
#4  0x00007f68f4b8dcbd in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f68f0902297 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f68f77d01ef in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f68bffff700 (LWP 877)):
#0  0x00007f68f090839d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f68f3cd3ac4 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f68f3cd3b09 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f68f0902297 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f68f77d01ef in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f68d5272700 (LWP 798)):
#0  0x00007f68f77c6326 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f68f4dbc471 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f68f4dbdb5e in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f68f4d6721a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f68f4b8940a in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f68ef612645 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007f68f4b8dcbd in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f68f0902297 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f68f77d01ef in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f68d7b52700 (LWP 758)):
#0  0x00007f68f77c6326 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f68f4dbc471 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f68f4dbdb5e in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f68f4d6721a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f68f4b8940a in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f68ee7a8d45 in  () at /usr/lib/libQt5DBus.so.5
#6  0x00007f68f4b8dcbd in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f68f0902297 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f68f77d01ef in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f68ddeb2700 (LWP 751)):
#0  0x00007f68f77c624d in poll () at /usr/lib/libc.so.6
#1  0x00007f68f689f8e0 in  () at /usr/lib/libxcb.so.1
#2  0x00007f68f68a1679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f68defb4d49 in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f68f4b8dcbd in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f68f0902297 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f68f77d01ef in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f68f7d76840 (LWP 730)):
#0  0x00007f68f77cb349 in syscall () at /usr/lib/libc.so.6
#1  0x00007f68d43d98b5 in  () at /usr/lib/libGLX_nvidia.so.0
#2  0x00007f68d43d95b3 in  () at /usr/lib/libGLX_nvidia.so.0
#3  0x00007f68c6332943 in  () at /usr/lib/libnvidia-glcore.so.384.47
#4  0x00007f68c622baf8 in  () at /usr/lib/libnvidia-glcore.so.384.47
#5  0x00007f68c5eb8c74 in  () at /usr/lib/libnvidia-glcore.so.384.47
#6  0x00007f68f04a6294 in KWin::checkGLError(char const*) () at /usr/lib/libkwinglutils.so.11
#7  0x00007f68f733b402 in  () at /usr/lib/libkwin.so.5
#8  0x00007f68f733b742 in KWin::SceneOpenGL::createScene(QObject*) () at /usr/lib/libkwin.so.5
#9  0x00007f68f7312ba4 in KWin::Compositor::slotCompositingOptionsInitialized() () at /usr/lib/libkwin.so.5
#10 0x00007f68f73137ea in KWin::Compositor::setup() () at /usr/lib/libkwin.so.5
#11 0x00007f68f4d97e72 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#12 0x00007f68f5a9746c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#13 0x00007f68f5a9ecf4 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#14 0x00007f68f4d68b98 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#15 0x00007f68f4d6b02d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#16 0x00007f68f4dbd974 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#17 0x00007f68df0175bd in  () at /usr/lib/libQt5XcbQpa.so.5
#18 0x00007f68f4d6721a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#19 0x00007f68f4d6fa74 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#20 0x00007f68f7a93fd5 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so
#21 0x00007f68f770343a in __libc_start_main () at /usr/lib/libc.so.6
#22 0x000000000040069a in _start ()

Reported using DrKonqi