Application: kwin_x11 (5.13.4)

Qt Version: 5.11.1
Frameworks Version: 5.49.0
Operating System: Linux 4.17.0-9-generic x86_64
Distribution: Ubuntu Cosmic Cuttlefish (development branch)

-- Information about the crash:
- What I was doing when the application crashed:
When I full window browsing(Firefox),  press use 'F11' button for returning from full screen.
Then crash alarm notification is on.

The crash can be reproduced sometimes.

-- 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 0x7f3250c6b200 (LWP 1743))]

Thread 10 (Thread 0x7f31928f2700 (LWP 11484)):
#0  0x00007f325a0e42eb in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55ce070a2e34) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f325a0e42eb in __pthread_cond_wait_common (abstime=0x0, mutex=0x55ce070a2de0, cond=0x55ce070a2e08) at pthread_cond_wait.c:502
#2  0x00007f325a0e42eb in __pthread_cond_wait (cond=0x55ce070a2e08, mutex=0x55ce070a2de0) at pthread_cond_wait.c:655
#3  0x00007f325b4ad43b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f3259a7b279 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f3259a7b4da in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f325b4acc87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f325a0de164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007f325cb0edef in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7f3193cdd700 (LWP 11392)):
#0  0x00007f325cb027d6 in __GI_ppoll (fds=0x7f3234000d68, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007f325b6a3141 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f325b6a45b9 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f325b65416b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f325b4a30b6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f3259745c75 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007f325b4acc87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f325a0de164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007f325cb0edef in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f324e18c700 (LWP 7350)):
#0  0x00007f325a0e42eb in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55ce06e033f4) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f325a0e42eb in __pthread_cond_wait_common (abstime=0x0, mutex=0x55ce06e033a0, cond=0x55ce06e033c8) at pthread_cond_wait.c:502
#2  0x00007f325a0e42eb in __pthread_cond_wait (cond=0x55ce06e033c8, mutex=0x55ce06e033a0) at pthread_cond_wait.c:655
#3  0x00007f325b4ad43b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f3259a7b279 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f3259a7b4da in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f325b4acc87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f325a0de164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007f325cb0edef in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f3233fff700 (LWP 6680)):
#0  0x00007f325a0e42eb in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55ce06a64f80) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f325a0e42eb in __pthread_cond_wait_common (abstime=0x0, mutex=0x55ce06a64f30, cond=0x55ce06a64f58) at pthread_cond_wait.c:502
#2  0x00007f325a0e42eb in __pthread_cond_wait (cond=0x55ce06a64f58, mutex=0x55ce06a64f30) at pthread_cond_wait.c:655
#3  0x00007f325b4ad43b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f3259a7b279 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f3259a7b4da in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f325b4acc87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f325a0de164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007f325cb0edef in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f32317bc700 (LWP 3700)):
#0  0x00007f325a0e42eb in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55ce069e5a44) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f325a0e42eb in __pthread_cond_wait_common (abstime=0x0, mutex=0x55ce069e59f0, cond=0x55ce069e5a18) at pthread_cond_wait.c:502
#2  0x00007f325a0e42eb in __pthread_cond_wait (cond=0x55ce069e5a18, mutex=0x55ce069e59f0) at pthread_cond_wait.c:655
#3  0x00007f325b4ad43b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f3259a7b279 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f3259a7b4da in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f325b4acc87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f325a0de164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007f325cb0edef in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f3231fbd700 (LWP 3699)):
#0  0x00007f325cb027d6 in __GI_ppoll (fds=0x7f31a80015f8, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007f325b6a3141 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f325b6a45b9 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f325b65416b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f325b4a30b6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f3259745c75 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007f325b4acc87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f325a0de164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007f325cb0edef in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f32337fe700 (LWP 1857)):
#0  0x00007f325a0e42eb in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f325b0c0fb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f325a0e42eb in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f325b0c0f68, cond=0x7f325b0c0f90) at pthread_cond_wait.c:502
#2  0x00007f325a0e42eb in __pthread_cond_wait (cond=0x7f325b0c0f90, mutex=0x7f325b0c0f68) at pthread_cond_wait.c:655
#3  0x00007f325afc9e2a in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007f325afc9e49 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007f325a0de164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007f325cb0edef in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f324d5ab700 (LWP 1824)):
#0  0x00007f325cb027d6 in __GI_ppoll (fds=0x7f3238000d28, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007f325b6a3141 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f325b6a45b9 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f325b65416b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f325b4a30b6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f3259745c75 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007f325b4acc87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f325a0de164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007f325cb0edef in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f324ed3c700 (LWP 1800)):
#0  0x00007f325cb027d6 in __GI_ppoll (fds=0x7f324000f178, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007f325b6a3141 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f325b6a45b9 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f325b65416b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f325b4a30b6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f325922f545 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#6  0x00007f325b4acc87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f325a0de164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007f325cb0edef in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f3250c6b200 (LWP 1743)):
[KCrash Handler]
#6  0x00007f325c83c3f2 in KWin::Workspace::clientArea(KWin::clientAreaOption, int, int) const () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#7  0x00007f325b15f3a8 in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#8  0x00007f325c879f41 in KWin::EffectsHandlerImpl::prePaintWindow(KWin::EffectWindow*, KWin::WindowPrePaintData&, int) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#9  0x00007f325c86abd2 in KWin::Scene::paintGenericScreen(int, KWin::ScreenPaintData) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#10 0x00007f324c35c7ab in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kwin.scenes/KWinSceneOpenGL.so
#11 0x00007f325c86c277 in KWin::Scene::finalPaintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#12 0x00007f325c879d95 in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#13 0x00007f325b1c8b7a in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#14 0x00007f325c879d3d in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#15 0x00007f325b23bb51 in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.11
#16 0x00007f325c879d3d in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#17 0x00007f325b23bb51 in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.11
#18 0x00007f325c879d3d in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#19 0x00007f325b160242 in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#20 0x00007f325b16051e in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#21 0x00007f325c879d3d in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#22 0x00007f325c86bf6e 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
#23 0x00007f324c356ce6 in KWin::SceneOpenGL::paint(QRegion, QList<KWin::Toplevel*>) () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kwin.scenes/KWinSceneOpenGL.so
#24 0x00007f325c85dcea in KWin::Compositor::performCompositing() () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#25 0x00007f325b67ef4b in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007f325c0164a1 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#27 0x00007f325c01dae0 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#28 0x00007f325b655499 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#29 0x00007f325b6a6558 in QTimerInfoList::activateTimers() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#30 0x00007f325b6a470c in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#31 0x00007f32504f10ed in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#32 0x00007f325b65416b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x00007f325b65c2e2 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#34 0x00007f325cbe847b in kdemain () at /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#35 0x00007f325ca1809b in __libc_start_main (main=0x55ce051a7050, argc=3, argv=0x7ffc229de718, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc229de708) at ../csu/libc-start.c:308
#36 0x000055ce051a708a in _start ()
[Inferior 1 (process 1743) detached]

Reported using DrKonqi