Application: kwin_x11 (5.14.4)

Qt Version: 5.11.1
Frameworks Version: 5.52.0
Operating System: Linux 4.18.0-12-generic x86_64
Distribution: Ubuntu 18.10

-- Information about the crash:
- What I was doing when the application crashed:
Resuming Kubuntu from Suspend, repeated manually or by lifting laptop lid then logging in.
- Unusual behavior I noticed:
Desktop and programs unresponsive to mouse clicks after resuming from Suspend. Keyboard navigation (.e.g ALT-tab) works as normal.
Panel unresponsive as well as all programs.
Mouse does not register items (e.g. text fields, clickable buttons etc.) and animations on icons are not triggered on mouse-over.
The login from Suspend screen is also unresponsive to mouse but not keyboard.
Not repeatable from what I can tell.

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 0x7ffaba0cb840 (LWP 2048))]

Thread 6 (Thread 0x7ffaa1f58700 (LWP 4537)):
#0  0x00007ffac46d97d6 in __GI_ppoll (fds=0x559800fd14a8, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007ffac3295141 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007ffac32965b9 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007ffac324616b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ffac30950b6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ffac309ec87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007ffac1e99164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#7  0x00007ffac46e5def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7ffaa0f4d700 (LWP 2200)):
#0  0x00007ffac1e9f2eb in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7ffac2c85fb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007ffac1e9f2eb in __pthread_cond_wait_common (abstime=0x0, mutex=0x7ffac2c85f68, cond=0x7ffac2c85f90) at pthread_cond_wait.c:502
#2  0x00007ffac1e9f2eb in __pthread_cond_wait (cond=0x7ffac2c85f90, mutex=0x7ffac2c85f68) at pthread_cond_wait.c:655
#3  0x00007ffac2b8ee2a in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007ffac2b8ee49 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007ffac1e99164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007ffac46e5def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7ffab2450700 (LWP 2164)):
#0  0x00007ffac46d97d6 in __GI_ppoll (fds=0x7ffaa8000d28, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007ffac3295141 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007ffac32965b9 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007ffac324616b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ffac30950b6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ffac16c91f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007ffac309ec87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007ffac1e99164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007ffac46e5def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7ffab3fff700 (LWP 2157)):
#0  0x00007ffac46d97d6 in __GI_ppoll (fds=0x7ffaac00f148, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007ffac3295141 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007ffac32965b9 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007ffac324616b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ffac30950b6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ffac11a4545 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#6  0x00007ffac309ec87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007ffac1e99164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007ffac46e5def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7ffab9510700 (LWP 2074)):
#0  0x00007ffac46d96d9 in __GI___poll (fds=0x7ffab950fc78, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007ffac2fbe917 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007ffac2fc053a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007ffab9a04159 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007ffac309ec87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ffac1e99164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007ffac46e5def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7ffaba0cb840 (LWP 2048)):
[KCrash Handler]
#6  0x00007ffac2d9cf01 in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#7  0x00007ffac2d9cfc4 in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#8  0x00007ffac2d9e525 in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#9  0x00007ffac2d9ef03 in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#10 0x00007ffac444db33 in KWin::EffectsHandlerImpl::drawWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#11 0x00007ffac2d0e339 in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#12 0x00007ffac444db33 in KWin::EffectsHandlerImpl::drawWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#13 0x00007ffac2e03d6c in KWin::Effect::drawWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.11
#14 0x00007ffac444db33 in KWin::EffectsHandlerImpl::drawWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#15 0x00007ffac443a1cc in KWin::Scene::finalPaintWindow(KWin::EffectWindowImpl*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#16 0x00007ffac444d9cb in KWin::EffectsHandlerImpl::paintWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#17 0x00007ffac2d8f93a in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#18 0x00007ffac444d973 in KWin::EffectsHandlerImpl::paintWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#19 0x00007ffac2e03bfc in KWin::Effect::paintWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.11
#20 0x00007ffac444d973 in KWin::EffectsHandlerImpl::paintWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#21 0x00007ffac2e03bfc in KWin::Effect::paintWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.11
#22 0x00007ffac444d973 in KWin::EffectsHandlerImpl::paintWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#23 0x00007ffac2e1112b in KWin::AnimationEffect::paintWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.11
#24 0x00007ffac444d973 in KWin::EffectsHandlerImpl::paintWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#25 0x00007ffac444055e in KWin::Scene::paintWindow(KWin::Scene::Window*, int, QRegion, KWin::WindowQuadList) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#26 0x00007ffac443cd0c in KWin::Scene::paintSimpleScreen(int, QRegion) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#27 0x00007ffab11f37d2 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kwin.scenes/KWinSceneOpenGL.so
#28 0x00007ffac443fb30 in KWin::Scene::finalPaintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#29 0x00007ffac444d725 in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#30 0x00007ffac2e03b51 in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.11
#31 0x00007ffac444d6cd in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#32 0x00007ffac2e03b51 in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.11
#33 0x00007ffac444d6cd in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#34 0x00007ffac2e03b51 in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.11
#35 0x00007ffac444d6cd in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#36 0x00007ffac2e03b51 in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.11
#37 0x00007ffac444d6cd in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#38 0x00007ffac443f7de in KWin::Scene::paintScreen(int*, QRegion const&, QRegion const&, QRegion*, QRegion*, QMatrix4x4 const&, QRect const&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#39 0x00007ffab11fb676 in KWin::SceneOpenGL::paint(QRegion, QList<KWin::Toplevel*>) () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kwin.scenes/KWinSceneOpenGL.so
#40 0x00007ffac44315fa in KWin::Compositor::performCompositing() () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#41 0x00007ffac3270f4b in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#42 0x00007ffac3c084a1 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#43 0x00007ffac3c0fae0 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#44 0x00007ffac3247499 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#45 0x00007ffac3298558 in QTimerInfoList::activateTimers() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#46 0x00007ffac329670c in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#47 0x00007ffab9a960ed in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#48 0x00007ffac324616b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#49 0x00007ffac324e2e2 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#50 0x00007ffac47bf47b in kdemain () at /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#51 0x00007ffac45ef09b in __libc_start_main (main=0x55980074e050, argc=1, argv=0x7fff02471518, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff02471508) at ../csu/libc-start.c:308
#52 0x000055980074e08a in _start ()
[Inferior 1 (process 2048) detached]

Reported using DrKonqi