Application: kwin_x11 (5.10.5)

Qt Version: 5.9.1
Frameworks Version: 5.37.0
Operating System: Linux 4.12.8-2-ARCH x86_64
Distribution (Platform): Archlinux Packages

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

- Unusual behavior I noticed:

- Custom settings of the application:

I was switching between my opened applications and suddenly kwin started flashing and i got two kwin crashes. I used restart application button to start kde again. But compositing disabled automatically. I had to start compositing manually from settings.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f67e4974840 (LWP 5265))]

Thread 10 (Thread 0x7f67a5dc2700 (LWP 5283)):
#0  0x00007f67dd4841ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f67e0813b04 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f67e0813b49 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f67dd47e049 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f67e42edf0f in clone () at /usr/lib/libc.so.6

Thread 9 (Thread 0x7f67a7054700 (LWP 5281)):
#0  0x00007f67dd4841ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f67ae25459c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f67ae2542a8 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f67dd47e049 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f67e42edf0f in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7f67a7855700 (LWP 5280)):
#0  0x00007f67dd4841ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f67ae25459c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f67ae2542a8 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f67dd47e049 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f67e42edf0f in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7f67a8056700 (LWP 5279)):
#0  0x00007f67dd4841ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f67ae25459c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f67ae2542a8 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f67dd47e049 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f67e42edf0f in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f67a8857700 (LWP 5278)):
#0  0x00007f67dd4841ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f67ae25459c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f67ae2542a8 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f67dd47e049 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f67e42edf0f in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f67a925d700 (LWP 5277)):
#0  0x00007f67dd4841ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f67ae25459c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f67ae2542a8 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f67dd47e049 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f67e42edf0f in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f67a9a5e700 (LWP 5276)):
#0  0x00007f67dd4841ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f67ae25459c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f67ae2542a8 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f67dd47e049 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f67e42edf0f in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f67c1d9c700 (LWP 5274)):
#0  0x00007f67e42e3f76 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f67e18f4ba3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f67e18f633f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f67e189cffb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f67e16b640e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f67dbf7a3d9 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007f67e16bb15b in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f67dd47e049 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f67e42edf0f in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f67c8a96700 (LWP 5269)):
#0  0x00007f67e42e3f76 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f67e18f4ba3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f67e18f633f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f67e189cffb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f67e16b640e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f67db11a396 in  () at /usr/lib/libQt5DBus.so.5
#6  0x00007f67e16bb15b in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f67dd47e049 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f67e42edf0f in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f67e4974840 (LWP 5265)):
[KCrash Handler]
#5  0x00007f67ae5ef92e in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#6  0x00007f67ae36e612 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#7  0x00007f67ae15e9c1 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#8  0x00007f67ae123710 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#9  0x00007f67ae123baa in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#10 0x00007f67dc629437 in QSGBatchRenderer::Renderer::renderMergedBatch(QSGBatchRenderer::Batch const*) () at /usr/lib/libQt5Quick.so.5
#11 0x00007f67dc62a6d6 in QSGBatchRenderer::Renderer::renderBatches() () at /usr/lib/libQt5Quick.so.5
#12 0x00007f67dc62ff66 in QSGBatchRenderer::Renderer::render() () at /usr/lib/libQt5Quick.so.5
#13 0x00007f67dc62059f in QSGRenderer::renderScene(QSGBindable const&) () at /usr/lib/libQt5Quick.so.5
#14 0x00007f67dc620a6c in QSGRenderer::renderScene(unsigned int) () at /usr/lib/libQt5Quick.so.5
#15 0x00007f67dc65bcd0 in QSGDefaultRenderContext::renderNextFrame(QSGRenderer*, unsigned int) () at /usr/lib/libQt5Quick.so.5
#16 0x00007f67dc6ba3a0 in QQuickWindowPrivate::renderSceneGraph(QSize const&) () at /usr/lib/libQt5Quick.so.5
#17 0x00007f67dc64dd18 in  () at /usr/lib/libQt5Quick.so.5
#18 0x00007f67dc6c4996 in QQuickWindow::event(QEvent*) () at /usr/lib/libQt5Quick.so.5
#19 0x00007f679774dc14 in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib/libKF5PlasmaQuick.so.5
#20 0x00007f67e25c5e4c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#21 0x00007f67e25cd926 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#22 0x00007f67e189ebd0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#23 0x00007f67e1e0d293 in QWindowPrivate::deliverUpdateRequest() () at /usr/lib/libQt5Gui.so.5
#24 0x00007f67e1e0d7bb in QWindow::event(QEvent*) () at /usr/lib/libQt5Gui.so.5
#25 0x00007f67dc6c4936 in QQuickWindow::event(QEvent*) () at /usr/lib/libQt5Quick.so.5
#26 0x00007f679774dc14 in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib/libKF5PlasmaQuick.so.5
#27 0x00007f67e25c5e4c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#28 0x00007f67e25cd926 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#29 0x00007f67e189ebd0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#30 0x00007f67e18f84a8 in QTimerInfoList::activateTimers() () at /usr/lib/libQt5Core.so.5
#31 0x00007f67e18f65a4 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#32 0x00007f67cbd510de in  () at /usr/lib/libQt5XcbQpa.so.5
#33 0x00007f67e189cffb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#34 0x00007f67e18a6048 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#35 0x00007f67e45ae6d3 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so
#36 0x00007f67e42204ca in __libc_start_main () at /usr/lib/libc.so.6
#37 0x00005613034ca7ca in _start ()

Reported using DrKonqi