Application: kwin_x11 (5.8.4)

Qt Version: 5.7.0
Frameworks Version: 5.28.0
Operating System: Linux 4.8.13-1-ARCH x86_64
Distribution (Platform): Archlinux Packages

-- Information about the crash:
- What I was doing when the application crashed:

0. I was running ordinary Plasma Desktop
1. I selected "switch user" (or whatewer it is called in english localization)
2. logged in as a different user to Plasma
3. then I logged out from the second user and I was dropped back to my original session, but with a notification kwin has crashed

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f1e4e9d9840 (LWP 4705))]

Thread 6 (Thread 0x7f1e1bdb4700 (LWP 8811)):
#0  0x00007f1e4e415551 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f1e4bac2ad9 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f1e4bac43c8 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f1e4ba7124a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f1e4b8940f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f1e4b898d78 in  () at /usr/lib/libQt5Core.so.5
#6  0x00007f1e476ac454 in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007f1e4e41e7df in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f1e1aef8700 (LWP 4813)):
#0  0x00007f1e476b210f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f1e4aa08ac4 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f1e4aa08b09 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f1e476ac454 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f1e4e41e7df in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f1e27fff700 (LWP 4765)):
#0  0x00007f1e4e415551 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f1e4bac2ad9 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f1e4bac43c8 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f1e4ba7124a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f1e4b8940f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f1e4640a2d5 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007f1e4b898d78 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f1e476ac454 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f1e4e41e7df in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f1e2f110700 (LWP 4724)):
#0  0x00007f1e4e415551 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f1e4bac2ad9 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f1e4bac43c8 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f1e4ba7124a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f1e4b8940f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f1e455d4e55 in  () at /usr/lib/libQt5DBus.so.5
#6  0x00007f1e4b898d78 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f1e476ac454 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f1e4e41e7df in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f1e35241700 (LWP 4715)):
#0  0x00007f1e4e41548d in poll () at /usr/lib/libc.so.6
#1  0x00007f1e4d5558e0 in  () at /usr/lib/libxcb.so.1
#2  0x00007f1e4d557679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f1e36119449 in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f1e4b898d78 in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f1e476ac454 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f1e4e41e7df in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f1e4e9d9840 (LWP 4705)):
[KCrash Handler]
#6  0x00007f1e4e3b9efa in __memmove_sse2_unaligned_erms () at /usr/lib/libc.so.6
#7  0x00007f1e472507ee in KWin::GLVertexBuffer::setData(int, int, float const*, float const*) () at /usr/lib/libkwinglutils.so.9
#8  0x00007f1e4dfc1abe in  () at /usr/lib/libkwin.so.5
#9  0x00007f1e4dfc55e5 in KWin::SceneOpenGL::paintBackground(QRegion) () at /usr/lib/libkwin.so.5
#10 0x00007f1e4dfad5f8 in KWin::Scene::paintSimpleScreen(int, QRegion) () at /usr/lib/libkwin.so.5
#11 0x00007f1e4dfc1a43 in  () at /usr/lib/libkwin.so.5
#12 0x00007f1e4dfafdc4 in KWin::Scene::finalPaintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/libkwin.so.5
#13 0x00007f1e4dfdf55f in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/libkwin.so.5
#14 0x00007f1e4b23c5ff in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/libkwineffects.so.9
#15 0x00007f1e4dfdf50a in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/libkwin.so.5
#16 0x00007f1e4b23c5ff in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/libkwineffects.so.9
#17 0x00007f1e4dfdf50a in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/libkwin.so.5
#18 0x00007f1e4b23c5ff in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/libkwineffects.so.9
#19 0x00007f1e4dfdf50a in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/libkwin.so.5
#20 0x00007f1e4dfafa6d in KWin::Scene::paintScreen(int*, QRegion const&, QRegion const&, QRegion*, QRegion*, QMatrix4x4 const&) () at /usr/lib/libkwin.so.5
#21 0x00007f1e4dfc6298 in KWin::SceneOpenGL::paint(QRegion, QList<KWin::Toplevel*>) () at /usr/lib/libkwin.so.5
#22 0x00007f1e4df9f9d7 in KWin::Compositor::performCompositing() () at /usr/lib/libkwin.so.5
#23 0x00007f1e4ba9f483 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#24 0x00007f1e4c752e0c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#25 0x00007f1e4c75a581 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#26 0x00007f1e4ba72df0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#27 0x00007f1e4bac66be in QTimerInfoList::activateTimers() () at /usr/lib/libQt5Core.so.5
#28 0x00007f1e4bac4628 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#29 0x00007f1e3619217d in  () at /usr/lib/libQt5XcbQpa.so.5
#30 0x00007f1e4ba7124a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#31 0x00007f1e4ba7974c in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#32 0x00007f1e4e6dd495 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so
#33 0x00007f1e4e356291 in __libc_start_main () at /usr/lib/libc.so.6
#34 0x000000000040069a in _start ()

Reported using DrKonqi