Application: kwin_x11 (5.17.3)

Qt Version: 5.13.2
Frameworks Version: 5.64.0
Operating System: Linux 5.2.16-050216-generic x86_64
Distribution: KDE neon User Edition 5.17

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

- Unusual behavior I noticed:
KWin crashes when switching between TTY and also sometimes after sleep

The crash can be reproduced every time.

-- 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 0x7facd2cd0880 (LWP 2033))]

Thread 5 (Thread 0x7facab1fe700 (LWP 2115)):
#0  0x00007faccb4ff9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7faccecf8fb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007faccb4ff9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7faccecf8f68, cond=0x7faccecf8f90) at pthread_cond_wait.c:502
#2  0x00007faccb4ff9f3 in __pthread_cond_wait (cond=0x7faccecf8f90, mutex=0x7faccecf8f68) at pthread_cond_wait.c:655
#3  0x00007faccea03874 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007faccea038b9 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007faccb4f96db in start_thread (arg=0x7facab1fe700) at pthread_create.c:463
#6  0x00007facd264988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7facabfff700 (LWP 2094)):
#0  0x00007facd263ccf6 in __GI_ppoll (fds=fds@entry=0x7faca0000d28, nfds=nfds@entry=1, timeout=<optimized out>, timeout@entry=0x0, sigmask=sigmask@entry=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007faccfb3e8a1 in ppoll (__ss=<optimized out>, __timeout=<optimized out>, __nfds=<optimized out>, __fds=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/poll2.h:77
#2  0x00007faccfb3e8a1 in qt_ppoll (timeout_ts=0x0, nfds=1, fds=0x7faca0000d28) at kernel/qcore_unix.cpp:132
#3  0x00007faccfb3e8a1 in qt_safe_poll(pollfd*, unsigned long, timespec const*) (fds=0x7faca0000d28, nfds=1, timeout_ts=timeout_ts@entry=0x0) at kernel/qcore_unix.cpp:153
#4  0x00007faccfb40038 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qeventdispatcher_unix.cpp:500
#5  0x00007faccfae306a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7facabffed00, flags=..., flags@entry=...) at kernel/qeventloop.cpp:225
#6  0x00007faccf8fe3aa in QThread::exec() (this=this@entry=0x55f010d10c40) at thread/qthread.cpp:531
#7  0x00007facc9f05815 in QQmlThreadPrivate::run() (this=0x55f010d10c40) at qml/ftw/qqmlthread.cpp:152
#8  0x00007faccf8ffb52 in QThreadPrivate::start(void*) (arg=0x55f010d10c40) at thread/qthread_unix.cpp:360
#9  0x00007faccb4f96db in start_thread (arg=0x7facabfff700) at pthread_create.c:463
#10 0x00007facd264988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7facb322a700 (LWP 2038)):
#0  0x00007facd263ccf6 in __GI_ppoll (fds=fds@entry=0x7facac00f138, nfds=nfds@entry=1, timeout=<optimized out>, timeout@entry=0x0, sigmask=sigmask@entry=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007faccfb3e8a1 in ppoll (__ss=<optimized out>, __timeout=<optimized out>, __nfds=<optimized out>, __fds=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/poll2.h:77
#2  0x00007faccfb3e8a1 in qt_ppoll (timeout_ts=0x0, nfds=1, fds=0x7facac00f138) at kernel/qcore_unix.cpp:132
#3  0x00007faccfb3e8a1 in qt_safe_poll(pollfd*, unsigned long, timespec const*) (fds=0x7facac00f138, nfds=1, timeout_ts=timeout_ts@entry=0x0) at kernel/qcore_unix.cpp:153
#4  0x00007faccfb40038 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qeventdispatcher_unix.cpp:500
#5  0x00007faccfae306a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7facb3229cf0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:225
#6  0x00007faccf8fe3aa in QThread::exec() (this=this@entry=0x7facc8d3ad80 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread.cpp:531
#7  0x00007facc8ac30e5 in QDBusConnectionManager::run() (this=0x7facc8d3ad80 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:178
#8  0x00007faccf8ffb52 in QThreadPrivate::start(void*) (arg=0x7facc8d3ad80 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:360
#9  0x00007faccb4f96db in start_thread (arg=0x7facb322a700) at pthread_create.c:463
#10 0x00007facd264988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7facb98d0700 (LWP 2036)):
#0  0x00007facd263cbf9 in __GI___poll (fds=0x7facb98cfc28, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007faccf638747 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007faccf63a36a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007facbac09e10 in QXcbEventQueue::run() (this=0x55f010b16e50) at qxcbeventqueue.cpp:228
#4  0x00007faccf8ffb52 in QThreadPrivate::start(void*) (arg=0x55f010b16e50) at thread/qthread_unix.cpp:360
#5  0x00007faccb4f96db in start_thread (arg=0x7facb98d0700) at pthread_create.c:463
#6  0x00007facd264988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7facd2cd0880 (LWP 2033)):
[KCrash Handler]
#6  0x00007faccedcc76e in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#7  0x00007faccedcc844 in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#8  0x00007faccedce5fd in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#9  0x00007faccedcef4e in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#10 0x00007facd21059ee in KWin::EffectsHandlerImpl::drawWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#11 0x00007facced35f0a in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#12 0x00007facd21059ee in KWin::EffectsHandlerImpl::drawWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#13 0x00007facd21a3760 in KWin::Scene::finalPaintWindow(KWin::EffectWindowImpl*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#14 0x00007facd210587d in KWin::EffectsHandlerImpl::paintWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#15 0x00007faccf0360b0 in KWin::Effect::paintWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.12
#16 0x00007facd210581e in KWin::EffectsHandlerImpl::paintWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#17 0x00007faccf0360b0 in KWin::Effect::paintWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.12
#18 0x00007facd210581e in KWin::EffectsHandlerImpl::paintWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#19 0x00007facd21a9b35 in KWin::Scene::paintWindow(KWin::Scene::Window*, int, QRegion, KWin::WindowQuadList) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#20 0x00007facd21a5d44 in KWin::Scene::paintSimpleScreen(int, QRegion) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#21 0x00007facaa0d58a2 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kwin.scenes/KWinSceneOpenGL.so
#22 0x00007facd21a9017 in KWin::Scene::finalPaintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#23 0x00007facd21055d5 in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#24 0x00007faccf036001 in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.12
#25 0x00007facd210557d in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#26 0x00007faccf036001 in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.12
#27 0x00007facd210557d in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#28 0x00007facd21a8d0e 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
#29 0x00007facaa0dca71 in KWin::SceneOpenGL::paint(QRegion, QList<KWin::Toplevel*>) () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kwin.scenes/KWinSceneOpenGL.so
#30 0x00007facd20d2476 in KWin::Compositor::performCompositing() () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#31 0x00007faccfb163eb in QObject::event(QEvent*) (this=0x55f010b4b840, e=<optimized out>) at kernel/qobject.cpp:1282
#32 0x00007facd08e9eac in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=this@entry=0x55f010b14460, receiver=receiver@entry=0x55f010b4b840, e=e@entry=0x7fff5dac96f0) at kernel/qapplication.cpp:3703
#33 0x00007facd08f14b0 in QApplication::notify(QObject*, QEvent*) (this=0x7fff5dac99a0, receiver=0x55f010b4b840, e=0x7fff5dac96f0) at kernel/qapplication.cpp:3449
#34 0x00007faccfae4f08 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x55f010b4b840, event=0x7fff5dac96f0) at kernel/qcoreapplication.cpp:1095
#35 0x00007faccfb42009 in QTimerInfoList::activateTimers() (this=this@entry=0x55f010b74430) at kernel/qtimerinfo_unix.cpp:643
#36 0x00007faccfb3f43c in QEventDispatcherUNIXPrivate::activateTimers() (this=this@entry=0x55f010b74390) at kernel/qeventdispatcher_unix.cpp:249
#37 0x00007faccfb4033a in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qeventdispatcher_unix.cpp:514
#38 0x00007facbac0b15e in QXcbUnixEventDispatcher::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x55f010b72650, flags=...) at qxcbeventdispatcher.cpp:60
#39 0x00007faccfae306a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fff5dac98b0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:225
#40 0x00007faccfaec3e0 in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1403
#41 0x00007facd2921d05 in kdemain () at /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#42 0x00007facd2549b97 in __libc_start_main (main=0x55f00edf9720, argc=3, argv=0x7fff5dac9b48, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff5dac9b38) at ../csu/libc-start.c:310
#43 0x000055f00edf975a in _start ()

Possible duplicates by query: bug 414457, bug 414438, bug 414436, bug 414434, bug 414388.

Reported using DrKonqi