Application: kwin_x11 (5.8.4)

Qt Version: 5.7.0
Frameworks Version: 5.28.0
Operating System: Linux 4.4.33-1-MANJARO x86_64
Distribution: "Manjaro Linux"

-- Information about the crash:
- What I was doing when the application crashed: I simply woke my PC up from sleep, as I usually do, only to be greeted by the "Kwin stopped unexpectedly" message box.
This has happened twice in a row. Take note here - I had nothing open in the foreground the first time it happened. This time around, I had Firefox running, with two tabs open - Gmail and YouTube.

- Unusual behavior I noticed: Lately I have to start Kwin, Plasmashell or both manually after rebooting or logging into a different account.

Scenario #1: Plasmashell starts, but Kwin doesn't
Solution: "kwin_x11 --replace" in Yakuake

Scenario #2: Kwin starts, but Plasmashell doesn't
Solution: "plasmashell" in either Yakuake or Konsole

Scenario #3: Neither start and I get no output after logging in through SDDM - screen turns off (bad sign on a laptop), nothing shows up.
Solution: Directly restart PC by holding down the power button. Nothing else works, not even SysRq shortcuts.


- Custom settings of the application: Loads of desktop effects enabled. None of them are 3rd party, though. All of them were bundled in the distro I installed (Manjaro KDE 16.10.2).

The crash can be reproduced sometimes.

-- Backtrace:
Application: KWin (kwin_x11), signal: Aborted
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f57909b9840 (LWP 10483))]

Thread 6 (Thread 0x7f56cbfff700 (LWP 19531)):
[KCrash Handler]
#6  0x00007f579035104f in raise () at /usr/lib/libc.so.6
#7  0x00007f579035247a in abort () at /usr/lib/libc.so.6
#8  0x00007f578d8674a1 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f5774092e34 in  () at /usr/lib/qt/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#10 0x00007f578da869ce in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#11 0x00007f578da936d8 in QTimer::timerEvent(QTimerEvent*) () at /usr/lib/libQt5Core.so.5
#12 0x00007f578da87473 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#13 0x00007f578e73ae0c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#14 0x00007f578e742581 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#15 0x00007f578da5ade0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#16 0x00007f578daae6ae in QTimerInfoList::activateTimers() () at /usr/lib/libQt5Core.so.5
#17 0x00007f578daac618 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#18 0x00007f578da5923a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#19 0x00007f578d87c0f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#20 0x00007f578d880d78 in  () at /usr/lib/libQt5Core.so.5
#21 0x00007f5789694454 in start_thread () at /usr/lib/libpthread.so.0
#22 0x00007f57904067df in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f5758e6d700 (LWP 10515)):
#0  0x00007f578969a10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f578c9f0ac4 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f578c9f0b09 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f5789694454 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f57904067df in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f575c298700 (LWP 10510)):
#0  0x00007f57903fd551 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f578daaaac9 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f578daac3b8 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f578da5923a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f578d87c0f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f57883f22d5 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007f578d880d78 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f5789694454 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f57904067df in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f576ffff700 (LWP 10487)):
#0  0x00007f57903fd551 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f578daaaac9 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f578daac3b8 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f578da5923a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f578d87c0f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f57875bce55 in  () at /usr/lib/libQt5DBus.so.5
#6  0x00007f578d880d78 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f5789694454 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f57904067df in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f57761d3700 (LWP 10486)):
#0  0x00007f57903fd48d in poll () at /usr/lib/libc.so.6
#1  0x00007f578f53d8e0 in  () at /usr/lib/libxcb.so.1
#2  0x00007f578f53f679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f5776c7f449 in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f578d880d78 in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f5789694454 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f57904067df in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f57909b9840 (LWP 10483)):
#0  0x00007f578969a10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f578f53db57 in  () at /usr/lib/libxcb.so.1
#2  0x00007f578f53f39f in  () at /usr/lib/libxcb.so.1
#3  0x00007f578f53f4b2 in xcb_wait_for_reply () at /usr/lib/libxcb.so.1
#4  0x00007f57740901fa in KWin::X11Cursor::doGetPos() () at /usr/lib/qt/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#5  0x00007f578fee91ea in KWin::Cursor::pos() () at /usr/lib/libkwin.so.5
#6  0x00007f578ff33da5 in  () at /usr/lib/libkwin.so.5
#7  0x00007f578ff37606 in KWin::Workspace::workspaceEvent(xcb_generic_event_t*) () at /usr/lib/libkwin.so.5
#8  0x00007f578da5837f in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/libQt5Core.so.5
#9  0x00007f5776c80c14 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/libQt5XcbQpa.so.5
#10 0x00007f5776c818a5 in QXcbConnection::processXcbEvents() () at /usr/lib/libQt5XcbQpa.so.5
#11 0x00007f578da874b9 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#12 0x00007f578e73ae0c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#13 0x00007f578e742581 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#14 0x00007f578da5ade0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#15 0x00007f578da5d56d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#16 0x00007f578daac1fa in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#17 0x00007f5776cf817d in  () at /usr/lib/libQt5XcbQpa.so.5
#18 0x00007f578da5923a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#19 0x00007f578da6173c in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#20 0x00007f57906c5495 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so
#21 0x00007f579033e291 in __libc_start_main () at /usr/lib/libc.so.6
#22 0x000000000040069a in _start ()

Reported using DrKonqi