Application: kwin_x11 (5.8.6)

Qt Version: 5.6.1
Frameworks Version: 5.26.0
Operating System: Linux 4.4.62-18.6-default x86_64
Distribution: "openSUSE Leap 42.2"

-- Information about the crash:
- What I was doing when the application crashed:
ctrl-alt-f1
loginctl unlock-sessions
ctrl-alt-f7

Just installed the most recent updates.
Screen lock stopped working.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fb542aa8940 (LWP 2191))]

Thread 7 (Thread 0x7fb51e5ba700 (LWP 1778573)):
#0  0x00007fb5424ed0bf in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007fb53f6e165b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib64/libQt5Core.so.5
#2  0x00007fb53a99b4eb in  () at /usr/lib64/libQt5Quick.so.5
#3  0x00007fb53a99b995 in  () at /usr/lib64/libQt5Quick.so.5
#4  0x00007fb53f6e09e9 in  () at /usr/lib64/libQt5Core.so.5
#5  0x00007fb5424e8744 in start_thread () at /lib64/libpthread.so.0
#6  0x00007fb542226d3d in clone () at /lib64/libc.so.6

Thread 6 (Thread 0x7fb51d7e2700 (LWP 691752)):
#0  0x00007fb5424ed0bf in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007fb53f6e165b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib64/libQt5Core.so.5
#2  0x00007fb53a99b4eb in  () at /usr/lib64/libQt5Quick.so.5
#3  0x00007fb53a99b995 in  () at /usr/lib64/libQt5Quick.so.5
#4  0x00007fb53f6e09e9 in  () at /usr/lib64/libQt5Core.so.5
#5  0x00007fb5424e8744 in start_thread () at /lib64/libpthread.so.0
#6  0x00007fb542226d3d in clone () at /lib64/libc.so.6

Thread 5 (Thread 0x7fb51ffff700 (LWP 9189)):
#0  0x00007fb54221fb03 in select () at /lib64/libc.so.6
#1  0x00007fb53f8ef849 in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () at /usr/lib64/libQt5Core.so.5
#2  0x00007fb53f8f10c3 in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () at /usr/lib64/libQt5Core.so.5
#3  0x00007fb53f8f1527 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007fb53f8a0fdb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#5  0x00007fb53f6dbf1a in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#6  0x00007fb53f6e09e9 in  () at /usr/lib64/libQt5Core.so.5
#7  0x00007fb5424e8744 in start_thread () at /lib64/libpthread.so.0
#8  0x00007fb542226d3d in clone () at /lib64/libc.so.6

Thread 4 (Thread 0x7fb51cfd1700 (LWP 2313)):
#0  0x00007fb5424ed0bf in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007fb53e86f93b in  () at /usr/lib64/libQt5Script.so.5
#2  0x00007fb53e86f969 in  () at /usr/lib64/libQt5Script.so.5
#3  0x00007fb5424e8744 in start_thread () at /lib64/libpthread.so.0
#4  0x00007fb542226d3d in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7fb51f5bb700 (LWP 2278)):
#0  0x00007fb54221fb03 in select () at /lib64/libc.so.6
#1  0x00007fb53f8ef849 in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () at /usr/lib64/libQt5Core.so.5
#2  0x00007fb53f8f10c3 in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () at /usr/lib64/libQt5Core.so.5
#3  0x00007fb53f8f1527 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007fb53f8a0fdb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#5  0x00007fb53f6dbf1a in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#6  0x00007fb53a2c69c8 in  () at /usr/lib64/libQt5Qml.so.5
#7  0x00007fb53f6e09e9 in  () at /usr/lib64/libQt5Core.so.5
#8  0x00007fb5424e8744 in start_thread () at /lib64/libpthread.so.0
#9  0x00007fb542226d3d in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7fb525a44700 (LWP 2228)):
#0  0x00007fb54221fb03 in select () at /lib64/libc.so.6
#1  0x00007fb53f8ef849 in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () at /usr/lib64/libQt5Core.so.5
#2  0x00007fb53f8f10c3 in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () at /usr/lib64/libQt5Core.so.5
#3  0x00007fb53f8f1527 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007fb53f8a0fdb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#5  0x00007fb53f6dbf1a in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#6  0x00007fb5394a71d5 in  () at /usr/lib64/libQt5DBus.so.5
#7  0x00007fb53f6e09e9 in  () at /usr/lib64/libQt5Core.so.5
#8  0x00007fb5424e8744 in start_thread () at /lib64/libpthread.so.0
#9  0x00007fb542226d3d in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7fb542aa8940 (LWP 2191)):
[KCrash Handler]
#6  0x00007fb5421ce3c9 in __memcpy_sse2_unaligned () at /lib64/libc.so.6
#7  0x00007fb53b11c823 in KWin::GLVertexBuffer::setData(int, int, float const*, float const*) () at /usr/lib64/libkwinglutils.so.9
#8  0x00007fb541dd976e in  () at /usr/lib64/libkwin.so.5
#9  0x00007fb541de03d5 in KWin::SceneOpenGL::paintBackground(QRegion) () at /usr/lib64/libkwin.so.5
#10 0x00007fb541dcafd9 in KWin::Scene::paintSimpleScreen(int, QRegion) () at /usr/lib64/libkwin.so.5
#11 0x00007fb541dd9273 in  () at /usr/lib64/libkwin.so.5
#12 0x00007fb541dcd0d5 in KWin::Scene::finalPaintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib64/libkwin.so.5
#13 0x00007fb541dfb280 in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib64/libkwin.so.5
#14 0x00007fb53f0827df in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib64/libkwineffects.so.9
#15 0x00007fb541dfb240 in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib64/libkwin.so.5
#16 0x00007fb541dccd78 in KWin::Scene::paintScreen(int*, QRegion const&, QRegion const&, QRegion*, QRegion*, QMatrix4x4 const&) () at /usr/lib64/libkwin.so.5
#17 0x00007fb541de0f6c in KWin::SceneOpenGL::paint(QRegion, QList<KWin::Toplevel*>) () at /usr/lib64/libkwin.so.5
#18 0x00007fb541dbffca in KWin::Compositor::performCompositing() () at /usr/lib64/libkwin.so.5
#19 0x00007fb53f8cdf34 in QObject::event(QEvent*) () at /usr/lib64/libQt5Core.so.5
#20 0x00007fb5405a9e3c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#21 0x00007fb5405ae49a in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#22 0x00007fb53f8a2fc5 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
#23 0x00007fb53f8f2c7e in QTimerInfoList::activateTimers() () at /usr/lib64/libQt5Core.so.5
#24 0x00007fb53f8f15c8 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#25 0x00007fb528c6694d in  () at /usr/lib64/libQt5XcbQpa.so.5
#26 0x00007fb53f8a0fdb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#27 0x00007fb53f8a8ec6 in QCoreApplication::exec() () at /usr/lib64/libQt5Core.so.5
#28 0x00007fb5427069cc in kdemain () at /usr/lib64/libkdeinit5_kwin_x11.so
#29 0x00007fb54215d6e5 in __libc_start_main () at /lib64/libc.so.6
#30 0x0000000000400809 in _start ()

Reported using DrKonqi