Application: kwin_x11 (5.9.2)

Qt Version: 5.8.0
Frameworks Version: 5.31.0
Operating System: Linux 4.9.9-1-MANJARO x86_64
Distribution: "Manjaro Linux"

-- Information about the crash:
- What I was doing when the application crashed:
I just logged in after turning my computer on

- Unusual behavior I noticed:
Every time after clicking shutdown, it crashed with no backtrace since a few days.

I'm using Manjaro with two monitors, 1366x768 and 1920x1080, on an ASUS K46CB

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 0x7ff4e3aa2840 (LWP 1234))]

Thread 5 (Thread 0x7ff4b37ff700 (LWP 1283)):
[KCrash Handler]
#6  0x00007ff4e0ac4cb2 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007ff4e0a61dde in QLockFile::tryLock(int) () at /usr/lib/libQt5Core.so.5
#8  0x00007ff4e2870609 in  () at /usr/lib/libKF5ConfigCore.so.5
#9  0x00007ff4e28542a8 in KConfig::sync() () at /usr/lib/libKF5ConfigCore.so.5
#10 0x00007ff4c27143a4 in  () at /usr/lib/qt/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#11 0x00007ff4e0b5e0be in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#12 0x00007ff4e0b6ad98 in QTimer::timerEvent(QTimerEvent*) () at /usr/lib/libQt5Core.so.5
#13 0x00007ff4e0b5eb63 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#14 0x00007ff4e181434c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#15 0x00007ff4e181bb61 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#16 0x00007ff4e0b32440 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#17 0x00007ff4e0b85cbe in QTimerInfoList::activateTimers() () at /usr/lib/libQt5Core.so.5
#18 0x00007ff4e0b83bda in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#19 0x00007ff4e0b3089a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#20 0x00007ff4e0952a73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#21 0x00007ff4e09576d8 in  () at /usr/lib/libQt5Core.so.5
#22 0x00007ff4dc744454 in start_thread () at /usr/lib/libpthread.so.0
#23 0x00007ff4e35067df in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7ff4c0e47700 (LWP 1279)):
#0  0x00007ff4e34fd551 in ppoll () at /usr/lib/libc.so.6
#1  0x00007ff4e0b822f9 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007ff4e0b8396a in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007ff4e0b3089a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007ff4e0952a73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007ff4db453025 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007ff4e09576d8 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007ff4dc744454 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007ff4e35067df in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7ff4c3136700 (LWP 1260)):
#0  0x00007ff4e34fd551 in ppoll () at /usr/lib/libc.so.6
#1  0x00007ff4e0b822f9 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007ff4e0b8396a in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007ff4e0b3089a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007ff4e0952a73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007ff4da609125 in  () at /usr/lib/libQt5DBus.so.5
#6  0x00007ff4e09576d8 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007ff4dc744454 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007ff4e35067df in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7ff4c9143700 (LWP 1256)):
#0  0x00007ff4e34fd48d in poll () at /usr/lib/libc.so.6
#1  0x00007ff4e26198e0 in  () at /usr/lib/libxcb.so.1
#2  0x00007ff4e261b679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007ff4c9df3239 in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007ff4e09576d8 in  () at /usr/lib/libQt5Core.so.5
#5  0x00007ff4dc744454 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007ff4e35067df in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7ff4e3aa2840 (LWP 1234)):
#0  0x00007ff4dc74a10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007ff4e2619b57 in  () at /usr/lib/libxcb.so.1
#2  0x00007ff4e261b39f in  () at /usr/lib/libxcb.so.1
#3  0x00007ff4e261b4b2 in xcb_wait_for_reply () at /usr/lib/libxcb.so.1
#4  0x00007ff4e2160b2a in  () at /usr/lib/libKF5WindowSystem.so.5
#5  0x00007ff4e215cd14 in NETWinInfo::update(QFlags<NET::Property>, QFlags<NET::Property2>) () at /usr/lib/libKF5WindowSystem.so.5
#6  0x00007ff4e215fc70 in NETWinInfo::updateWMState() () at /usr/lib/libKF5WindowSystem.so.5
#7  0x00007ff4e2160525 in NETWinInfo::setState(QFlags<NET::State>, QFlags<NET::State>) () at /usr/lib/libKF5WindowSystem.so.5
#8  0x00007ff4e2fbfd32 in KWin::Client::doSetSkipTaskbar() () at /usr/lib/libkwin.so.5
#9  0x00007ff4e2fb69bd in KWin::AbstractClient::setSkipTaskbar(bool) () at /usr/lib/libkwin.so.5
#10 0x00007ff4e3037d08 in KWin::Client::manage(unsigned int, bool) () at /usr/lib/libkwin.so.5
#11 0x00007ff4e2fa7204 in KWin::Workspace::createClient(unsigned int, bool) () at /usr/lib/libkwin.so.5
#12 0x00007ff4e30231fa in KWin::Workspace::workspaceEvent(xcb_generic_event_t*) () at /usr/lib/libkwin.so.5
#13 0x00007ff4e0b2f55f in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/libQt5Core.so.5
#14 0x00007ff4c9df4974 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/libQt5XcbQpa.so.5
#15 0x00007ff4c9df5655 in QXcbConnection::processXcbEvents() () at /usr/lib/libQt5XcbQpa.so.5
#16 0x00007ff4e0b5eba9 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#17 0x00007ff4e181434c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#18 0x00007ff4e181bb61 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#19 0x00007ff4e0b32440 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#20 0x00007ff4e0b34bcd in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#21 0x00007ff4e0b83797 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#22 0x00007ff4c9e53ded in  () at /usr/lib/libQt5XcbQpa.so.5
#23 0x00007ff4e0b3089a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#24 0x00007ff4e0b38de4 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#25 0x00007ff4e37c5391 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so
#26 0x00007ff4e343e291 in __libc_start_main () at /usr/lib/libc.so.6
#27 0x000000000040069a in _start ()

Reported using DrKonqi