Application: kwin_x11 (5.11.4)

Qt Version: 5.9.3
Frameworks Version: 5.40.0
Operating System: Linux 4.14.6-1-default x86_64
Distribution: "openSUSE Tumbleweed"

-- Information about the crash:
- What I was doing when the application crashed: I was normally using KDE with a few open windows. Nothing special, really. Radeon RX580, and have selected OpenGL 3.1. It crashes about a dozen times every day, during Alt+Tab. Seems more likely when one of the windows has content like a playing video or a VM. Most of the time I have to manually start kwin_x11 again.

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f6407139dc0 (LWP 23319))]

Thread 13 (Thread 0x7f63d2fa4700 (LWP 23337)):
#0  0x00007f63ffadf82d in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f63d09dd06b in  () at /usr/lib64/dri/radeonsi_dri.so
#2  0x00007f63d09dcf87 in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007f63ffad9558 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f6406ab76df in clone () at /lib64/libc.so.6

Thread 12 (Thread 0x7f63b77fe700 (LWP 23334)):
#0  0x00007f63ffadf82d in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f640304d554 in  () at /usr/lib64/libQt5Script.so.5
#2  0x00007f640304d599 in  () at /usr/lib64/libQt5Script.so.5
#3  0x00007f63ffad9558 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f6406ab76df in clone () at /lib64/libc.so.6

Thread 11 (Thread 0x7f63c4bd0700 (LWP 23332)):
#0  0x00007f63ffadf82d in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f63d09dd06b in  () at /usr/lib64/dri/radeonsi_dri.so
#2  0x00007f63d09dcf87 in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007f63ffad9558 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f6406ab76df in clone () at /lib64/libc.so.6

Thread 10 (Thread 0x7f63c53d1700 (LWP 23331)):
#0  0x00007f63ffadf82d in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f63d09dd06b in  () at /usr/lib64/dri/radeonsi_dri.so
#2  0x00007f63d09dcf87 in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007f63ffad9558 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f6406ab76df in clone () at /lib64/libc.so.6

Thread 9 (Thread 0x7f63c5bd2700 (LWP 23330)):
#0  0x00007f63ffadf82d in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f63d09dd06b in  () at /usr/lib64/dri/radeonsi_dri.so
#2  0x00007f63d09dcf87 in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007f63ffad9558 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f6406ab76df in clone () at /lib64/libc.so.6

Thread 8 (Thread 0x7f63c63d3700 (LWP 23329)):
#0  0x00007f63ffadf82d in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f63d09dd06b in  () at /usr/lib64/dri/radeonsi_dri.so
#2  0x00007f63d09dcf87 in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007f63ffad9558 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f6406ab76df in clone () at /lib64/libc.so.6

Thread 7 (Thread 0x7f63c6bd4700 (LWP 23328)):
#0  0x00007f63ffadf82d in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f63d09dd06b in  () at /usr/lib64/dri/radeonsi_dri.so
#2  0x00007f63d09dcf87 in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007f63ffad9558 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f6406ab76df in clone () at /lib64/libc.so.6

Thread 6 (Thread 0x7f63c73d5700 (LWP 23327)):
#0  0x00007f63ffadf82d in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f63d09dd06b in  () at /usr/lib64/dri/radeonsi_dri.so
#2  0x00007f63d09dcf87 in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007f63ffad9558 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f6406ab76df in clone () at /lib64/libc.so.6

Thread 5 (Thread 0x7f63c7ddb700 (LWP 23326)):
#0  0x00007f63ffadf82d in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f63d09dd06b in  () at /usr/lib64/dri/radeonsi_dri.so
#2  0x00007f63d09dcf87 in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007f63ffad9558 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f6406ab76df in clone () at /lib64/libc.so.6

Thread 4 (Thread 0x7f63c85dc700 (LWP 23325)):
#0  0x00007f63ffadf82d in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f63d09dd06b in  () at /usr/lib64/dri/radeonsi_dri.so
#2  0x00007f63d09dcf87 in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007f63ffad9558 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f6406ab76df in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7f63e4dd4700 (LWP 23323)):
#0  0x00007f6406aad026 in ppoll () at /lib64/libc.so.6
#1  0x00007f64040f7719 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib64/libQt5Core.so.5
#2  0x00007f64040f8cf6 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#3  0x00007f64040a3c5a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007f6403ed31ea in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#5  0x00007f63fe5e6ba5 in  () at /usr/lib64/libQt5Qml.so.5
#6  0x00007f6403ed7dde in  () at /usr/lib64/libQt5Core.so.5
#7  0x00007f63ffad9558 in start_thread () at /lib64/libpthread.so.0
#8  0x00007f6406ab76df in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f63e7839700 (LWP 23321)):
#0  0x00007f6406aad026 in ppoll () at /lib64/libc.so.6
#1  0x00007f64040f7719 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib64/libQt5Core.so.5
#2  0x00007f64040f8cf6 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#3  0x00007f64040a3c5a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007f6403ed31ea in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#5  0x00007f63fd7b0a45 in  () at /usr/lib64/libQt5DBus.so.5
#6  0x00007f6403ed7dde in  () at /usr/lib64/libQt5Core.so.5
#7  0x00007f63ffad9558 in start_thread () at /lib64/libpthread.so.0
#8  0x00007f6406ab76df in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f6407139dc0 (LWP 23319)):
[KCrash Handler]
#6  0x00007f63d0d7ffd6 in  () at /usr/lib64/dri/radeonsi_dri.so
#7  0x00007f63d0af7b33 in  () at /usr/lib64/dri/radeonsi_dri.so
#8  0x00007f63d0af5c2f in  () at /usr/lib64/dri/radeonsi_dri.so
#9  0x00007f63d0af60d5 in  () at /usr/lib64/dri/radeonsi_dri.so
#10 0x00007f63d091e776 in  () at /usr/lib64/dri/radeonsi_dri.so
#11 0x00007f63d0a5df0a in  () at /usr/lib64/dri/radeonsi_dri.so
#12 0x00007f63d25800cf in  () at /usr/lib64/libGLX_mesa.so.0
#13 0x00007f63ecf153f2 in  () at /usr/lib64/qt5/plugins/xcbglintegrations/libqxcb-glx-integration.so
#14 0x00007f64046a4532 in QOpenGLContext::swapBuffers(QSurface*) () at /usr/lib64/libQt5Gui.so.5
#15 0x00007f63fecbbb3e in  () at /usr/lib64/libQt5Quick.so.5
#16 0x00007f63fed2b34e in QQuickWindow::event(QEvent*) () at /usr/lib64/libQt5Quick.so.5
#17 0x00007f639ea4a423 in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib64/libKF5PlasmaQuick.so.5
#18 0x00007f6404e20b1c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#19 0x00007f6404e27ed4 in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#20 0x00007f64040a5648 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
#21 0x00007f6404678101 in QWindowPrivate::deliverUpdateRequest() () at /usr/lib64/libQt5Gui.so.5
#22 0x00007f64046785b9 in QWindow::event(QEvent*) () at /usr/lib64/libQt5Gui.so.5
#23 0x00007f63fed2b305 in QQuickWindow::event(QEvent*) () at /usr/lib64/libQt5Quick.so.5
#24 0x00007f639ea4a423 in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib64/libKF5PlasmaQuick.so.5
#25 0x00007f6404e20b1c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#26 0x00007f6404e27ed4 in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#27 0x00007f64040a5648 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
#28 0x00007f64040fad0e in QTimerInfoList::activateTimers() () at /usr/lib64/libQt5Core.so.5
#29 0x00007f64040f8f62 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#30 0x00007f63eee7aa5d in  () at /usr/lib64/libQt5XcbQpa.so.5
#31 0x00007f64040a3c5a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#32 0x00007f64040ac4e4 in QCoreApplication::exec() () at /usr/lib64/libQt5Core.so.5
#33 0x00007f6406d825f6 in kdemain () at /usr/lib64/libkdeinit5_kwin_x11.so
#34 0x00007f64069dff4a in __libc_start_main () at /lib64/libc.so.6
#35 0x000055839f69886a in _start ()

Reported using DrKonqi