Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f504e2cb840 (LWP 613))]

Thread 6 (Thread 0x7f5017fff700 (LWP 777)):
#0  0x00007f50479fa473 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib/libpthread.so.0
#1  0x00007f504ad58784 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f504ad587c9 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f50479f4254 in start_thread () at /lib/libpthread.so.0
#4  0x00007f504ddcd0ff in clone () at /lib/libc.so.6

Thread 5 (Thread 0x7f501f7ff700 (LWP 708)):
[KCrash Handler]
#6  0x00007f504bae9f50 in QLockFile::isLocked() const () at /usr/lib/libQt5Core.so.5
#7  0x00007f504d12a392 in  () at /usr/lib/libKF5ConfigCore.so.5
#8  0x00007f504d10ec80 in KConfig::sync() () at /usr/lib/libKF5ConfigCore.so.5
#9  0x00007f502ee576ff in  () at /usr/lib/qt5/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#10 0x00007f504bbe23bb in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#11 0x00007f504bbee9c7 in QTimer::timeout(QTimer::QPrivateSignal) () at /usr/lib/libQt5Core.so.5
#12 0x00007f504bbeecb8 in QTimer::timerEvent(QTimerEvent*) () at /usr/lib/libQt5Core.so.5
#13 0x00007f504bbe2d2b in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#14 0x00007f504c506b8c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#15 0x00007f504c50de81 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#16 0x00007f504bbb7108 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#17 0x00007f504bc090ae in QTimerInfoList::activateTimers() () at /usr/lib/libQt5Core.so.5
#18 0x00007f504bc0701a in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#19 0x00007f504bbb571a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#20 0x00007f504b9e433b in QThread::exec() () at /usr/lib/libQt5Core.so.5
#21 0x00007f504b9e8e7a in  () at /usr/lib/libQt5Core.so.5
#22 0x00007f50479f4254 in start_thread () at /lib/libpthread.so.0
#23 0x00007f504ddcd0ff in clone () at /lib/libc.so.6

Thread 4 (Thread 0x7f502d099700 (LWP 704)):
#0  0x00007f504ddc3b11 in ppoll () at /lib/libc.so.6
#1  0x00007f504bc05889 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f504bc06daa in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f504bbb571a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f504b9e433b in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f5046902955 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007f504b9e8e7a in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f50479f4254 in start_thread () at /lib/libpthread.so.0
#8  0x00007f504ddcd0ff in clone () at /lib/libc.so.6

Thread 3 (Thread 0x7f502f87a700 (LWP 655)):
#0  0x00007f504ddc3b11 in ppoll () at /lib/libc.so.6
#1  0x00007f504bc05889 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f504bc06daa in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f504bbb571a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f504b9e433b in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f504e3fb695 in  () at /usr/lib/libQt5DBus.so.5
#6  0x00007f504b9e8e7a in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f50479f4254 in start_thread () at /lib/libpthread.so.0
#8  0x00007f504ddcd0ff in clone () at /lib/libc.so.6

Thread 2 (Thread 0x7f503553a700 (LWP 654)):
#0  0x00007f504ddc3a4d in poll () at /lib/libc.so.6
#1  0x00007f504ced8892 in  () at /usr/lib/libxcb.so.1
#2  0x00007f504ceda5e7 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f50361e66f9 in  () at /usr/lib/qt5/plugins/platforms/../../../libQt5XcbQpa.so.5
#4  0x00007f504b9e8e7a in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f50479f4254 in start_thread () at /lib/libpthread.so.0
#6  0x00007f504ddcd0ff in clone () at /lib/libc.so.6

Thread 1 (Thread 0x7f504e2cb840 (LWP 613)):
#0  0x00007f50479fa473 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib/libpthread.so.0
#1  0x00007f504b9e9cbb in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f504b9e8a66 in QThread::wait(unsigned long) () at /usr/lib/libQt5Core.so.5
#3  0x00007f502ee57552 in KWin::X11StandalonePlatform::createOpenGLSafePoint(KWin::Platform::OpenGLSafePoint) () at /usr/lib/qt5/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#4  0x00007f504d932fe7 in KWin::Compositor::performCompositing() () at /usr/lib/libkwin.so.5
#5  0x00007f504bbe2d2b in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#6  0x00007f504c506b8c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#7  0x00007f504c50de81 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#8  0x00007f504bbb7108 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#9  0x00007f504bc090ae in QTimerInfoList::activateTimers() () at /usr/lib/libQt5Core.so.5
#10 0x00007f504bc0701a in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#11 0x00007f503624172d in  () at /usr/lib/qt5/plugins/platforms/../../../libQt5XcbQpa.so.5
#12 0x00007f504bbb571a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#13 0x00007f504bbbdf34 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#14 0x00007f504e08c11e in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so
#15 0x00007f504dd054e1 in __libc_start_main () at /lib/libc.so.6
#16 0x000000000040066a in _start ()