Application: kwin_x11 (5.13.3)

Qt Version: 5.11.1
Frameworks Version: 5.48.0
Operating System: Linux 4.17.5-1-zen x86_64
Distribution: "Artix"

-- Information about the crash:
I was sending an e-mail using Thunderbird. Other open application was: Palemoon, Dolphin, Konsole

The crash can be reproduced sometimes.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f3449409e80 (LWP 2686))]

Thread 6 (Thread 0x7f3427304700 (LWP 2864)):
#0  0x00007ffcd2cb8b04 in clock_gettime ()
#1  0x00007f3448da3d76 in clock_gettime () at /usr/lib/libc.so.6
#2  0x00007f344612c712 in  () at /usr/lib/libQt5Core.so.5
#3  0x00007f344612aefa in QTimerInfoList::updateCurrentTime() () at /usr/lib/libQt5Core.so.5
#4  0x00007f344612b4f6 in QTimerInfoList::timerWait(timespec&) () at /usr/lib/libQt5Core.so.5
#5  0x00007f344612a3f5 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f34460d86fc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f3445f21849 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f34407c39c9 in  () at /usr/lib/libQt5Qml.so.5
#9  0x00007f3445f2b8f5 in  () at /usr/lib/libQt5Core.so.5
#10 0x00007f3441d830bc in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f3448d962ff in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f340e005700 (LWP 2836)):
#0  0x00007f3441d8907c in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f344504caac in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f344504cac9 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f3441d830bc in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f3448d962ff in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f341886a700 (LWP 2835)):
#0  0x00007ffcd2cb8b04 in clock_gettime ()
#1  0x00007f3448da3d76 in clock_gettime () at /usr/lib/libc.so.6
#2  0x00007f344612c712 in  () at /usr/lib/libQt5Core.so.5
#3  0x00007f344612aefa in QTimerInfoList::updateCurrentTime() () at /usr/lib/libQt5Core.so.5
#4  0x00007f344612b4f6 in QTimerInfoList::timerWait(timespec&) () at /usr/lib/libQt5Core.so.5
#5  0x00007f344612a3f5 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f34460d86fc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f3445f21849 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f34407c39c9 in  () at /usr/lib/libQt5Qml.so.5
#9  0x00007f3445f2b8f5 in  () at /usr/lib/libQt5Core.so.5
#10 0x00007f3441d830bc in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f3448d962ff in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f341906b700 (LWP 2834)):
#0  0x00007f3441d8907c in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f341abaadc4 in  () at /usr/lib/dri/nouveau_dri.so
#2  0x00007f341abaaab8 in  () at /usr/lib/dri/nouveau_dri.so
#3  0x00007f3441d830bc in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f3448d962ff in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f342d8f2700 (LWP 2799)):
#0  0x00007ffcd2cb8b04 in clock_gettime ()
#1  0x00007f3448da3d76 in clock_gettime () at /usr/lib/libc.so.6
#2  0x00007f344612c712 in  () at /usr/lib/libQt5Core.so.5
#3  0x00007f344612aefa in QTimerInfoList::updateCurrentTime() () at /usr/lib/libQt5Core.so.5
#4  0x00007f344612b4f6 in QTimerInfoList::timerWait(timespec&) () at /usr/lib/libQt5Core.so.5
#5  0x00007f344612a3f5 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f34460d86fc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f3445f21849 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f343f6b5976 in  () at /usr/lib/libQt5DBus.so.5
#9  0x00007f3445f2b8f5 in  () at /usr/lib/libQt5Core.so.5
#10 0x00007f3441d830bc in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f3448d962ff in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f3449409e80 (LWP 2686)):
[KCrash Handler]
#6  0x00007f341a712fe5 in  () at /usr/lib/dri/nouveau_dri.so
#7  0x00007f341a4f268e in  () at /usr/lib/dri/nouveau_dri.so
#8  0x00007f341a9f16f7 in  () at /usr/lib/dri/nouveau_dri.so
#9  0x00007f341a9f189a in  () at /usr/lib/dri/nouveau_dri.so
#10 0x00007f341a8be61d in  () at /usr/lib/dri/nouveau_dri.so
#11 0x00007f341a8bea82 in  () at /usr/lib/dri/nouveau_dri.so
#12 0x00007f341a9ed64f in  () at /usr/lib/dri/nouveau_dri.so
#13 0x00007f341a4963fb in  () at /usr/lib/dri/nouveau_dri.so
#14 0x00007f341a490be3 in  () at /usr/lib/dri/nouveau_dri.so
#15 0x00007f3424375f81 in  () at /usr/lib/libGLX_mesa.so.0
#16 0x00007f3424363769 in  () at /usr/lib/libGLX_mesa.so.0
#17 0x00007f342f1e831e in  () at /usr/lib/qt/plugins/xcbglintegrations/libqxcb-glx-integration.so
#18 0x00007f342f1e8329 in  () at /usr/lib/qt/plugins/xcbglintegrations/libqxcb-glx-integration.so
#19 0x00007f3446723ddf in QOpenGLContext::destroy() () at /usr/lib/libQt5Gui.so.5
#20 0x00007f3446724178 in QOpenGLContext::~QOpenGLContext() () at /usr/lib/libQt5Gui.so.5
#21 0x00007f344672419a in QOpenGLContext::~QOpenGLContext() () at /usr/lib/libQt5Gui.so.5
#22 0x00007f342757db94 in  () at /usr/lib/qt/plugins/org.kde.kdecoration2/kwin5_aurorae.so
#23 0x00007f342757dc39 in  () at /usr/lib/qt/plugins/org.kde.kdecoration2/kwin5_aurorae.so
#24 0x00007f344884f3e6 in KWin::AbstractClient::destroyDecoration() () at /usr/lib/libkwin.so.5
#25 0x00007f344885f554 in KWin::Client::destroyDecoration() () at /usr/lib/libkwin.so.5
#26 0x00007f3448854e8c in KWin::Client::destroyClient() () at /usr/lib/libkwin.so.5
#27 0x00007f34488b1273 in KWin::Client::unmapNotifyEvent(xcb_unmap_notify_event_t*) () at /usr/lib/libkwin.so.5
#28 0x00007f34488b4b7c in KWin::Client::windowEvent(xcb_generic_event_t*) () at /usr/lib/libkwin.so.5
#29 0x00007f34488b5970 in KWin::Workspace::workspaceEvent(xcb_generic_event_t*) () at /usr/lib/libkwin.so.5
#30 0x00007f34460d751f in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/libQt5Core.so.5
#31 0x00007f34310f1a22 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/libQt5XcbQpa.so.5
#32 0x00007f34310f260d in QXcbConnection::processXcbEvents() () at /usr/lib/libQt5XcbQpa.so.5
#33 0x00007f3446104182 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#34 0x00007f3446eb2a74 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#35 0x00007f3446eba341 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#36 0x00007f34460d9a69 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#37 0x00007f34460dcafc in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#38 0x00007f344612a01d in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#39 0x00007f34311859de in  () at /usr/lib/libQt5XcbQpa.so.5
#40 0x00007f34460d86fc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#41 0x00007f34460e09f6 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#42 0x00007f3449062b56 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so
#43 0x00007f3448cc09a7 in __libc_start_main () at /usr/lib/libc.so.6
#44 0x000055f1a864a75a in _start ()

Reported using DrKonqi