Application: kwin_x11 (5.12.5)

Qt Version: 5.10.1
Frameworks Version: 5.47.0
Operating System: Linux 4.17.2-200.fc28.x86_64 x86_64
Distribution (Platform): Fedora RPMs

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

Moved my mouse to the top left corner of the screen. It doesn't happen again with same windows open.

The crash does not seem to be reproducible.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
28	  return SYSCALL_CANCEL (nanosleep, requested_time, remaining);
[Current thread is 1 (Thread 0x7f30b3a8b940 (LWP 5095))]

Thread 6 (Thread 0x7f307080f700 (LWP 16529)):
#0  0x00007f30a9df46a6 in __GI_ppoll (fds=0x7f306c001a38, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007f30aacbce55 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /lib64/libQt5Core.so.5
#2  0x00007f30aacbe159 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#3  0x00007f30aac6f12b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#4  0x00007f30aaabd9c6 in QThread::exec() () at /lib64/libQt5Core.so.5
#5  0x00007f30b1c7e339 in QQmlThreadPrivate::run() () at /lib64/libQt5Qml.so.5
#6  0x00007f30aaac211d in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#7  0x00007f30acf85594 in start_thread (arg=<optimized out>) at pthread_create.c:463
#8  0x00007f30a9dff02f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f306bfff700 (LWP 5519)):
#0  0x00007f30acf8b52c in futex_wait_cancelable (private=0, expected=0, futex_word=0x7f30b2de2478) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f30acf8b52c in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f30b2de2428, cond=0x7f30b2de2450) at pthread_cond_wait.c:502
#2  0x00007f30acf8b52c in __pthread_cond_wait (cond=0x7f30b2de2450, mutex=0x7f30b2de2428) at pthread_cond_wait.c:655
#3  0x00007f30b2cf49f8 in QTWTF::TCMalloc_PageHeap::scavengerThread() () at /lib64/libQt5Script.so.5
#4  0x00007f30b2cf4a63 in  () at /lib64/libQt5Script.so.5
#5  0x00007f30acf85594 in start_thread (arg=<optimized out>) at pthread_create.c:463
#6  0x00007f30a9dff02f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f3086203700 (LWP 5489)):
#0  0x00007f30a9df46a6 in __GI_ppoll (fds=0x7f3074000d28, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007f30aacbce55 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /lib64/libQt5Core.so.5
#2  0x00007f30aacbe159 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#3  0x00007f30aac6f12b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#4  0x00007f30aaabd9c6 in QThread::exec() () at /lib64/libQt5Core.so.5
#5  0x00007f30b1c7e339 in QQmlThreadPrivate::run() () at /lib64/libQt5Qml.so.5
#6  0x00007f30aaac211d in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#7  0x00007f30acf85594 in start_thread (arg=<optimized out>) at pthread_create.c:463
#8  0x00007f30a9dff02f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f308c832700 (LWP 5273)):
#0  0x00007f30a9df46a6 in __GI_ppoll (fds=0x7f308000ee68, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007f30aacbce55 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /lib64/libQt5Core.so.5
#2  0x00007f30aacbe159 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#3  0x00007f30aac6f12b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#4  0x00007f30aaabd9c6 in QThread::exec() () at /lib64/libQt5Core.so.5
#5  0x00007f30b3b4b299 in QDBusConnectionManager::run() () at /lib64/libQt5DBus.so.5
#6  0x00007f30aaac211d in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#7  0x00007f30acf85594 in start_thread (arg=<optimized out>) at pthread_create.c:463
#8  0x00007f30a9dff02f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f308e2b1700 (LWP 5144)):
#0  0x00007f30a9df45a9 in __GI___poll (fds=0x7f308e2b0b78, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f30ac47604f in _xcb_conn_wait () at /lib64/libxcb.so.1
#2  0x00007f30ac477caa in xcb_wait_for_event () at /lib64/libxcb.so.1
#3  0x00007f308efa24d9 in QXcbEventReader::run() () at /lib64/libQt5XcbQpa.so.5
#4  0x00007f30aaac211d in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#5  0x00007f30acf85594 in start_thread (arg=<optimized out>) at pthread_create.c:463
#6  0x00007f30a9dff02f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f30b3a8b940 (LWP 5095)):
[KCrash Handler]
#6  0x0000558a0d225890 in  ()
#7  0x00007f30b3467109 in KWin::Workspace::workspaceEvent(xcb_generic_event_t*) () at /lib64/libkwin.so.5
#8  0x00007f30aac6dc2c in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /lib64/libQt5Core.so.5
#9  0x00007f308efa3c84 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /lib64/libQt5XcbQpa.so.5
#10 0x00007f308efa4843 in QXcbConnection::processXcbEvents() () at /lib64/libQt5XcbQpa.so.5
#11 0x00007f30aac99a26 in QObject::event(QEvent*) () at /lib64/libQt5Core.so.5
#12 0x00007f30ab537e95 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#13 0x00007f30ab53f83a in QApplication::notify(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#14 0x00007f30aac70376 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib64/libQt5Core.so.5
#15 0x00007f30aac7309b in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /lib64/libQt5Core.so.5
#16 0x00007f30aacbdfcf in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#17 0x00007f308f030321 in QUnixEventDispatcherQPA::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5XcbQpa.so.5
#18 0x00007f30aac6f12b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#19 0x00007f30aac775b6 in QCoreApplication::exec() () at /lib64/libQt5Core.so.5
#20 0x00007f30b385593f in kdemain () at /lib64/libkdeinit5_kwin_x11.so
#21 0x00007f30a9d2818b in __libc_start_main (main=0x558a0a09fca0, argc=1, argv=0x7ffc742ae238, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc742ae228) at ../csu/libc-start.c:308
#22 0x0000558a0a09fcda in _start ()

Reported using DrKonqi