Application: kwin_x11 (5.18.3)

Qt Version: 5.12.4
Frameworks Version: 5.67.0
Operating System: Linux 5.3.0-40-lowlatency x86_64
Windowing system: X11
Distribution: Ubuntu 19.10

-- Information about the crash:
- What I was doing when the application crashed:
I had Desktop Grid effect active and I was moving a window (Gimp) from Desktop 1 to Desktop 2.

-- 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 0x7ff2c4cd7800 (LWP 5970))]

Thread 4 (Thread 0x7ff2a682a700 (LWP 6411)):
#0  0x00007ff2c9a822c6 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7ff2ca0affb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:80
#1  0x00007ff2c9a822c6 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x7ff2ca0aff68, cond=0x7ff2ca0aff90) at pthread_cond_wait.c:508
#2  0x00007ff2c9a822c6 in __pthread_cond_wait (cond=0x7ff2ca0aff90, mutex=0x7ff2ca0aff68) at pthread_cond_wait.c:638
#3  0x00007ff2c9fb908a in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007ff2c9fb90af in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007ff2c9a7b669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#6  0x00007ff2cbd0e323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7ff2c0e20700 (LWP 6398)):
#0  0x00007ff2cbd01d26 in __GI_ppoll (fds=0x7ff2ac000d68, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007ff2ca708589 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007ff2ca709af4 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007ff2ca6b35cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ff2ca4eca45 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ff2c924e319 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007ff2ca4edc92 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007ff2c9a7b669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#8  0x00007ff2cbd0e323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7ff2c30bb700 (LWP 5987)):
#0  0x00007ff2cbd01d26 in __GI_ppoll (fds=0x7ff2b400b4f8, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007ff2ca708589 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007ff2ca709af4 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007ff2ca6b35cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ff2ca4eca45 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ff2cb715efa in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#6  0x00007ff2ca4edc92 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007ff2c9a7b669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#8  0x00007ff2cbd0e323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7ff2c4cd7800 (LWP 5970)):
[KCrash Handler]
#6  0x00007ff2ca121f82 in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#7  0x00007ff2ca120540 in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#8  0x00007ff2cb9b961f in KWin::EffectsHandlerImpl::checkInputWindowEvent(QMouseEvent*) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#9  0x00007ff2c285bfde in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#10 0x00007ff2cb9c4316 in KWin::Workspace::workspaceEvent(xcb_generic_event_t*) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#11 0x00007ff2ca6b1e7f in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007ff2c4369855 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#13 0x00007ff2c436a82a in QXcbConnection::processXcbEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#14 0x00007ff2c4395650 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#15 0x00007ff2ca6b35cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00007ff2ca6bb336 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007ff2cbde68df in kdemain () at /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#18 0x00007ff2cbc131e3 in __libc_start_main (main=0x55f79065f060, argc=1, argv=0x7ffff255f448, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffff255f438) at ../csu/libc-start.c:308
#19 0x000055f79065f09e in _start ()
[Inferior 1 (process 5970) detached]

Possible duplicates by query: bug 418783, bug 418214, bug 417179, bug 416417, bug 416401.

Reported using DrKonqi