Application: kwin_x11 (5.10.4)

Qt Version: 5.9.1
Frameworks Version: 5.36.0
Operating System: Linux 4.12.4-1-ARCH x86_64
Distribution (Platform): Archlinux Packages

-- Information about the crash:
- What I was doing when the application crashed:
Open youtube video on vivaldi browser on second screen and then on other screen switch window with alt-tab

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f73d62f2840 (LWP 547))]

Thread 12 (Thread 0x7f73a35ef700 (LWP 772)):
#0  0x00007f73d5c70f76 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f73d3281ba3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f73d328333f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f73d3229ffb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f73d304340e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f73cd90d1d5 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007f73d304815b in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f73cee0c049 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f73d5c7af0f in clone () at /usr/lib/libc.so.6

Thread 11 (Thread 0x7f7394c38700 (LWP 666)):
#0  0x00007f73cee121ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f73d21a0b04 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f73d21a0b49 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f73cee0c049 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f73d5c7af0f in clone () at /usr/lib/libc.so.6

Thread 10 (Thread 0x7f7395c3a700 (LWP 658)):
#0  0x00007f73cee121ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f73a104352c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f73a1043238 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f73cee0c049 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f73d5c7af0f in clone () at /usr/lib/libc.so.6

Thread 9 (Thread 0x7f739643b700 (LWP 657)):
#0  0x00007f73cee121ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f73a104352c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f73a1043238 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f73cee0c049 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f73d5c7af0f in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7f7396c3c700 (LWP 656)):
#0  0x00007f73cee121ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f73a104352c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f73a1043238 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f73cee0c049 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f73d5c7af0f in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7f739743d700 (LWP 655)):
#0  0x00007f73cee121ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f73a104352c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f73a1043238 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f73cee0c049 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f73d5c7af0f in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f7397e43700 (LWP 654)):
#0  0x00007f73cee121ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f73a104352c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f73a1043238 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f73cee0c049 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f73d5c7af0f in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f7398785700 (LWP 653)):
#0  0x00007f73cee121ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f73a104352c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f73a1043238 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f73cee0c049 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f73d5c7af0f in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f73b142d700 (LWP 641)):
#0  0x00007f73d5c70f76 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f73d3281ba3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f73d328333f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f73d3229ffb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f73d304340e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f73cd90d1d5 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007f73d304815b in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f73cee0c049 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f73d5c7af0f in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f73b28fc700 (LWP 585)):
#0  0x00007f73d5c70f76 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f73d3281ba3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f73d328333f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f73d3229ffb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f73d304340e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f73ccaae396 in  () at /usr/lib/libQt5DBus.so.5
#6  0x00007f73d304815b in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f73cee0c049 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f73d5c7af0f in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f73bc3fa700 (LWP 554)):
#0  0x00007f73d5c70e9d in poll () at /usr/lib/libc.so.6
#1  0x00007f73d4d5d8e0 in  () at /usr/lib/libxcb.so.1
#2  0x00007f73d4d5f679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f73bd4da72a in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f73d304815b in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f73cee0c049 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f73d5c7af0f in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f73d62f2840 (LWP 547)):
[KCrash Handler]
#5  0x00007f73a13de64e in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#6  0x00007f73a115d572 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#7  0x00007f73a0f4d961 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#8  0x00007f73a0f126b0 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#9  0x00007f73a0f12b4a in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#10 0x00007f73cdfc039f in QSGBatchRenderer::Renderer::renderMergedBatch(QSGBatchRenderer::Batch const*) () at /usr/lib/libQt5Quick.so.5
#11 0x00007f73cdfc15e5 in QSGBatchRenderer::Renderer::renderBatches() () at /usr/lib/libQt5Quick.so.5
#12 0x00007f73cdfc6d44 in QSGBatchRenderer::Renderer::render() () at /usr/lib/libQt5Quick.so.5
#13 0x00007f73cdfb76ed in QSGRenderer::renderScene(QSGBindable const&) () at /usr/lib/libQt5Quick.so.5
#14 0x00007f73cdfb7bab in QSGRenderer::renderScene(unsigned int) () at /usr/lib/libQt5Quick.so.5
#15 0x00007f73cdff1f50 in QSGDefaultRenderContext::renderNextFrame(QSGRenderer*, unsigned int) () at /usr/lib/libQt5Quick.so.5
#16 0x00007f73ce04e948 in QQuickWindowPrivate::renderSceneGraph(QSize const&) () at /usr/lib/libQt5Quick.so.5
#17 0x00007f73cdfe43a9 in  () at /usr/lib/libQt5Quick.so.5
#18 0x00007f73ce058bd6 in QQuickWindow::event(QEvent*) () at /usr/lib/libQt5Quick.so.5
#19 0x00007f72fb032ba4 in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib/libKF5PlasmaQuick.so.5
#20 0x00007f73d3f52e4c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#21 0x00007f73d3f5a926 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#22 0x00007f73d322bbd0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#23 0x00007f73d379a293 in QWindowPrivate::deliverUpdateRequest() () at /usr/lib/libQt5Gui.so.5
#24 0x00007f73d379a7bb in QWindow::event(QEvent*) () at /usr/lib/libQt5Gui.so.5
#25 0x00007f73ce058b75 in QQuickWindow::event(QEvent*) () at /usr/lib/libQt5Quick.so.5
#26 0x00007f72fb032ba4 in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib/libKF5PlasmaQuick.so.5
#27 0x00007f73d3f52e4c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#28 0x00007f73d3f5a926 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#29 0x00007f73d322bbd0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#30 0x00007f73d32854a8 in QTimerInfoList::activateTimers() () at /usr/lib/libQt5Core.so.5
#31 0x00007f73d32835a4 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#32 0x00007f73bd53f0de in  () at /usr/lib/libQt5XcbQpa.so.5
#33 0x00007f73d3229ffb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#34 0x00007f73d3233048 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#35 0x00007f73d5f3b6d3 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so
#36 0x00007f73d5bad4ca in __libc_start_main () at /usr/lib/libc.so.6
#37 0x00000052ee49a7ca in _start ()

Reported using DrKonqi