Application: kwin_x11 (5.12.5)

Qt Version: 5.9.5
Frameworks Version: 5.44.0
Operating System: Linux 4.15.0-23-generic x86_64
Distribution: Ubuntu 18.04 LTS

-- Information about the crash:
- What I was doing when the application crashed:
I switched Activities, which caused Latte Dock to switch layouts. Somewhere in there, KWin may have had a problem. I saw no evidence of KWin crashing, and it seems to be working fine even now, without pushing the "restart" button that appears on the notification for these crashes.

- Custom settings of the application:
By default Latte Dock does not change with different Activities, and even after enablling these non-default settings, it some times acts up and runs both Activity-spesific layouts at the same time.

-- Backtrace:
Application: KWin (kwin_x11), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7ff5ba08ccc0 (LWP 2556))]

Thread 5 (Thread 0x7ff57cc79700 (LWP 2757)):
#0  0x00007ff5b2a5a9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7ff5b5ff1fb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007ff5b2a5a9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7ff5b5ff1f68, cond=0x7ff5b5ff1f90) at pthread_cond_wait.c:502
#2  0x00007ff5b2a5a9f3 in __pthread_cond_wait (cond=0x7ff5b5ff1f90, mutex=0x7ff5b5ff1f68) at pthread_cond_wait.c:655
#3  0x00007ff5b5cfb5f4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007ff5b5cfb639 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007ff5b2a546db in start_thread (arg=0x7ff57cc79700) at pthread_create.c:463
#6  0x00007ff5b99ff88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7ff58edee700 (LWP 2637)):
#0  0x00007ff5b99f2cf6 in __GI_ppoll (fds=0x7ff580000d28, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007ff5b6df45c1 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007ff5b6df5cde in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007ff5b6d9d9ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ff5b6bbc22a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ff5b15406f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007ff5b6bc116d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007ff5b2a546db in start_thread (arg=0x7ff58edee700) at pthread_create.c:463
#8  0x00007ff5b99ff88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7ff595564700 (LWP 2597)):
#0  0x00007ff5b99f2cf6 in __GI_ppoll (fds=0x7ff59000b178, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007ff5b6df45c1 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007ff5b6df5cde in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007ff5b6d9d9ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ff5b6bbc22a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ff5b0419d45 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#6  0x00007ff5b6bc116d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007ff5b2a546db in start_thread (arg=0x7ff595564700) at pthread_create.c:463
#8  0x00007ff5b99ff88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7ff5a070d700 (LWP 2587)):
#0  0x00007ff5b99f2bf9 in __GI___poll (fds=0x7ff5a070cc68, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007ff5b88fc747 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007ff5b88fe36a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007ff5a15ec2a9 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007ff5b6bc116d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ff5b2a546db in start_thread (arg=0x7ff5a070d700) at pthread_create.c:463
#6  0x00007ff5b99ff88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7ff5ba08ccc0 (LWP 2556)):
[KCrash Handler]
#6  0x00007ff5b991ce97 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#7  0x00007ff5b991e801 in __GI_abort () at abort.c:79
#8  0x00007ff5b6babfa7 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007ff5b950143b in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#10 0x00007ff5b9502ae0 in KWin::Workspace::storeClient(KConfigGroup&, int, KWin::Client*) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#11 0x00007ff5b9506ae4 in KWin::Workspace::storeSubSession(QString const&, QSet<QByteArray>) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#12 0x00007ff5b9600425 in KWin::Activities::reallyStop(QString const&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#13 0x00007ff5b6dcf122 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007ff5b7b1d82c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#15 0x00007ff5b7b250f4 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007ff5b6d9f9a8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007ff5b6da211d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007ff5b6df5af4 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007ff5a164f5cd in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#20 0x00007ff5b6d9d9ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007ff5b6da6a84 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007ff5b9cd7dbb in kdemain () at /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#23 0x00007ff5b98ffb97 in __libc_start_main (main=0x55807e586730, argc=3, argv=0x7ffd99ab8298, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd99ab8288) at ../csu/libc-start.c:310
#24 0x000055807e58676a in _start ()

Reported using DrKonqi