Application: kwin_x11 (5.14.5)

Qt Version: 5.11.3
Frameworks Version: 5.54.0
Operating System: Linux 4.19.0-2-amd64 x86_64
Distribution: Debian GNU/Linux buster/sid

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

I moved the mouse to the upper-right hand corner which I've bound to "show all windows" and got a crash instead.  This has not been reproduceable.

The crash does not seem to be reproducible.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f3e33dad980 (LWP 2417))]

Thread 7 (Thread 0x7f3e1bac6700 (LWP 6432)):
#0  0x00007f3e3d792fbc in futex_wait_cancelable (private=0, expected=0, futex_word=0x561afc38e890) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f3e3d792fbc in __pthread_cond_wait_common (abstime=0x0, mutex=0x561afc38e840, cond=0x561afc38e868) at pthread_cond_wait.c:502
#2  0x00007f3e3d792fbc in __pthread_cond_wait (cond=0x561afc38e868, mutex=0x561afc38e840) at pthread_cond_wait.c:655
#3  0x00007f3e3e5a542b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f3e3d2ec2d9 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f3e3d2ec53a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f3e3e5a4c77 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f3e3d78cfa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007f3e3fb9c80f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f3e31386700 (LWP 3087)):
#0  0x00007f3e3fb91c46 in __GI_ppoll (fds=0x7f3e2801a658, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007f3e3e79b031 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f3e3e79c4a9 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f3e3e74c14b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f3e3e59b0d6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f3e3cfb43a5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007f3e3e5a4c77 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f3e3d78cfa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007f3e3fb9c80f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f3e227ee700 (LWP 2483)):
#0  0x00007f3e3d792fbc in futex_wait_cancelable (private=0, expected=0, futex_word=0x7f3e3e18ffb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f3e3d792fbc in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f3e3e18ff68, cond=0x7f3e3e18ff90) at pthread_cond_wait.c:502
#2  0x00007f3e3d792fbc in __pthread_cond_wait (cond=0x7f3e3e18ff90, mutex=0x7f3e3e18ff68) at pthread_cond_wait.c:655
#3  0x00007f3e3e098e4a in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007f3e3e098e69 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007f3e3d78cfa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007f3e3fb9c80f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f3e23fff700 (LWP 2482)):
#0  0x00007f3e3fb91c46 in __GI_ppoll (fds=0x7f3e1c000d48, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007f3e3e79b031 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f3e3e79c4a9 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f3e3e74c14b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f3e3e59b0d6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f3e3cfb43a5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007f3e3e5a4c77 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f3e3d78cfa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007f3e3fb9c80f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f3e31e20700 (LWP 2459)):
#0  0x00007f3e3fb91c46 in __GI_ppoll (fds=0x7f3e2400b3a8, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007f3e3e79b031 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f3e3e79c4a9 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f3e3e74c14b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f3e3e59b0d6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f3e3ca7d545 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#6  0x00007f3e3e5a4c77 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f3e3d78cfa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007f3e3fb9c80f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f3e32eeb700 (LWP 2449)):
#0  0x00007f3e3fb91b49 in __GI___poll (fds=0x7f3e32eeab38, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f3e3e4c4cf7 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f3e3e4c691a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f3e333cf519 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f3e3e5a4c77 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f3e3d78cfa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007f3e3fb9c80f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f3e33dad980 (LWP 2417)):
[KCrash Handler]
#6  0x00007f3e3f8b6c9c in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#7  0x00007f3e3f8bacf6 in KWin::Workspace::workspaceEvent(xcb_generic_event_t*) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#8  0x00007f3e3e74afcf in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f3e333d0cb0 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#10 0x00007f3e333d1843 in QXcbConnection::processXcbEvents() () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#11 0x00007f3e3e776e52 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007f3e3f0c5491 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#13 0x00007f3e3f0ccac0 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#14 0x00007f3e3e74d479 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007f3e3e75046b in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00007f3e3e79c31b in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007f3e33462b6d in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#18 0x00007f3e3e74c14b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007f3e3e7542b2 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007f3e3fc6e47b in kdemain () at /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#21 0x00007f3e3fac709b in __libc_start_main (main=0x561af9dfe050, argc=3, argv=0x7ffd2b031588, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd2b031578) at ../csu/libc-start.c:308
#22 0x0000561af9dfe08a in _start ()
[Inferior 1 (process 2417) detached]

Reported using DrKonqi