Application: kwin_x11 (5.16.4)

Qt Version: 5.13.0
Frameworks Version: 5.61.0
Operating System: Linux 5.2.9-arch1-1-ARCH x86_64
Distribution: "Arch Linux"

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

Switched desktops with keyboard shortcut (Ctrl+Alt+arrow), then changed music in Gnome Music Player Client 11.8.16 with keyboard shortcut (Ctrl+Right Arrow).  All greebles and panels disappeared from desktop, then KWin restarted automatically at the first virtual desktop, with no apparent harm.

The crash does not seem to be reproducible.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f350d122d00 (LWP 5039))]

Thread 7 (Thread 0x7f35068a9700 (LWP 21723)):
#0  0x00007f351562a756 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f3514142913 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f3514143fa3 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f35140ed5ec in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f3513f202f5 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f35128428f9 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007f3513f21520 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f351551c57f in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f35156350e3 in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f346a2b7700 (LWP 6462)):
#0  0x00007f3515522415 in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f346a562e9c in  () at /usr/lib/dri/i965_dri.so
#2  0x00007f346a562a98 in  () at /usr/lib/dri/i965_dri.so
#3  0x00007f351551c57f in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f35156350e3 in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f34f7fff700 (LWP 5318)):
#0  0x00007f3515522415 in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f35139a9edc in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f35139a9ef9 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f351551c57f in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f35156350e3 in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f3505c97700 (LWP 5226)):
#0  0x00007ffd525f8605 in  ()
#1  0x00007f3515642ee3 in clock_gettime () at /usr/lib/libc.so.6
#2  0x00007f35141462a2 in  () at /usr/lib/libQt5Core.so.5
#3  0x00007f3514144b8a in QTimerInfoList::updateCurrentTime() () at /usr/lib/libQt5Core.so.5
#4  0x00007f3514145156 in QTimerInfoList::timerWait(timespec&) () at /usr/lib/libQt5Core.so.5
#5  0x00007f35141441d5 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f35140ed5ec in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f3513f202f5 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f35128428f9 in  () at /usr/lib/libQt5Qml.so.5
#9  0x00007f3513f21520 in  () at /usr/lib/libQt5Core.so.5
#10 0x00007f351551c57f in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f35156350e3 in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f3507b43700 (LWP 5072)):
#0  0x00007f351562a756 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f3514142913 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f3514143fa3 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f35140ed5ec in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f3513f202f5 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f3512273b37 in  () at /usr/lib/libQt5DBus.so.5
#6  0x00007f3513f21520 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f351551c57f in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f35156350e3 in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f350c9c7700 (LWP 5069)):
#0  0x00007f351562a667 in poll () at /usr/lib/libc.so.6
#1  0x00007f3513e41630 in  () at /usr/lib/libxcb.so.1
#2  0x00007f3513e432db in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f350cc99049 in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f3513f21520 in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f351551c57f in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f35156350e3 in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f350d122d00 (LWP 5039)):
[KCrash Handler]
#6  0x00007f35152b5289 in KWin::AbstractClient::setDesktops(QVector<KWin::VirtualDesktop*>) () at /usr/lib/libkwin.so.5
#7  0x00007f3515397022 in KWin::EffectsHandlerImpl::windowToDesktops(KWin::EffectWindow*, QVector<unsigned int> const&) () at /usr/lib/libkwin.so.5
#8  0x00007f3513b5ea39 in  () at /usr/lib/libkwin4_effect_builtins.so.1
#9  0x00007f35153989b7 in KWin::EffectsHandlerImpl::checkInputWindowEvent(QMouseEvent*) () at /usr/lib/libkwin.so.5
#10 0x00007f350c16664e in  () at /usr/lib/qt/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#11 0x00007f35153227b2 in KWin::Workspace::workspaceEvent(xcb_generic_event_t*) () at /usr/lib/libkwin.so.5
#12 0x00007f35140ec457 in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/libQt5Core.so.5
#13 0x00007f350cc6fe43 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/libQt5XcbQpa.so.5
#14 0x00007f350cc70bc9 in QXcbConnection::processXcbEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5XcbQpa.so.5
#15 0x00007f350cc9a3ae in  () at /usr/lib/libQt5XcbQpa.so.5
#16 0x00007f35140ed5ec in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#17 0x00007f35140f5326 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#18 0x00007f3515705588 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so
#19 0x00007f351555fee3 in __libc_start_main () at /usr/lib/libc.so.6
#20 0x000056161dd0405e in _start ()
[Inferior 1 (process 5039) detached]

Reported using DrKonqi