Application: kwin_x11 (5.14.0)

Qt Version: 5.11.1
Frameworks Version: 5.50.0
Operating System: Linux 4.15.0-38-generic x86_64
Distribution: KDE neon User Edition 5.14

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

Wanted to type in a password from KeePassXC, opened KeePassXC by double-clicking the respective icon in the icon area.

Note that KeePassXC is set up through KWin to be visible across all KDE activities (Activity > Force > All Activities).

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 0x7f45d3dd2940 (LWP 29482))]

Thread 5 (Thread 0x7f45a89a8700 (LWP 29515)):
#0  0x00007f45d37e6811 in __GI_ppoll (fds=fds@entry=0x7f4594000e58, nfds=nfds@entry=1, timeout=<optimized out>, timeout@entry=0x0, sigmask=sigmask@entry=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:50
#1  0x00007f45d0b96b21 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  qt_ppoll (timeout_ts=0x0, nfds=1, fds=0x7f4594000e58) at kernel/qcore_unix.cpp:112
#3  qt_safe_poll (fds=0x7f4594000e58, nfds=1, timeout_ts=timeout_ts@entry=0x0) at kernel/qcore_unix.cpp:133
#4  0x00007f45d0b981b2 in QEventDispatcherUNIX::processEvents (this=<optimized out>, flags=...) at kernel/qeventdispatcher_unix.cpp:500
#5  0x00007f45d0b425ba in QEventLoop::exec (this=this@entry=0x7f45a89a7c50, flags=..., flags@entry=...) at kernel/qeventloop.cpp:214
#6  0x00007f45d09775e4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:525
#7  0x00007f45cb4c5195 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f45d0982727 in QThreadPrivate::start (arg=0x2d52e10) at thread/qthread_unix.cpp:367
#9  0x00007f45cc8286ba in start_thread (arg=0x7f45a89a8700) at pthread_create.c:333
#10 0x00007f45d37f241d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f459ef3a700 (LWP 29495)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f45cfac4de4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f45cfac4e29 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f45cc8286ba in start_thread (arg=0x7f459ef3a700) at pthread_create.c:333
#4  0x00007f45d37f241d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f45abd1f700 (LWP 29492)):
#0  0x00007f45d37e6811 in __GI_ppoll (fds=fds@entry=0x7f45a0000ac8, nfds=nfds@entry=1, timeout=<optimized out>, timeout@entry=0x0, sigmask=sigmask@entry=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:50
#1  0x00007f45d0b96b21 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  qt_ppoll (timeout_ts=0x0, nfds=1, fds=0x7f45a0000ac8) at kernel/qcore_unix.cpp:112
#3  qt_safe_poll (fds=0x7f45a0000ac8, nfds=1, timeout_ts=timeout_ts@entry=0x0) at kernel/qcore_unix.cpp:133
#4  0x00007f45d0b981b2 in QEventDispatcherUNIX::processEvents (this=<optimized out>, flags=...) at kernel/qeventdispatcher_unix.cpp:500
#5  0x00007f45d0b425ba in QEventLoop::exec (this=this@entry=0x7f45abd1ec50, flags=..., flags@entry=...) at kernel/qeventloop.cpp:214
#6  0x00007f45d09775e4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:525
#7  0x00007f45cb4c5195 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f45d0982727 in QThreadPrivate::start (arg=0x1ce2390) at thread/qthread_unix.cpp:367
#9  0x00007f45cc8286ba in start_thread (arg=0x7f45abd1f700) at pthread_create.c:333
#10 0x00007f45d37f241d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f45b3078700 (LWP 29489)):
#0  0x00007f45d37e6811 in __GI_ppoll (fds=fds@entry=0x7f45ac00f538, nfds=nfds@entry=1, timeout=<optimized out>, timeout@entry=0x0, sigmask=sigmask@entry=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:50
#1  0x00007f45d0b96b21 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  qt_ppoll (timeout_ts=0x0, nfds=1, fds=0x7f45ac00f538) at kernel/qcore_unix.cpp:112
#3  qt_safe_poll (fds=0x7f45ac00f538, nfds=1, timeout_ts=timeout_ts@entry=0x0) at kernel/qcore_unix.cpp:133
#4  0x00007f45d0b981b2 in QEventDispatcherUNIX::processEvents (this=<optimized out>, flags=...) at kernel/qeventdispatcher_unix.cpp:500
#5  0x00007f45d0b425ba in QEventLoop::exec (this=this@entry=0x7f45b3077c40, flags=..., flags@entry=...) at kernel/qeventloop.cpp:214
#6  0x00007f45d09775e4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:525
#7  0x00007f45ca3c5f35 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#8  0x00007f45d0982727 in QThreadPrivate::start (arg=0x7f45ca63ed60) at thread/qthread_unix.cpp:367
#9  0x00007f45cc8286ba in start_thread (arg=0x7f45b3078700) at pthread_create.c:333
#10 0x00007f45d37f241d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f45d3dd2940 (LWP 29482)):
[KCrash Handler]
#6  0x00007f45d0b55839 in QMetaObject::invokeMethod (obj=0x7ffc0d541b60, member=0x0, member@entry=0x7f45d0345bff "addRepaintFull", type=type@entry=Qt::AutoConnection, ret=..., val0=..., val1=..., val2=..., val3=..., val4=..., val5=..., val6=..., val7=..., val8=..., val9=...) at kernel/qmetaobject.cpp:1474
#7  0x00007f45d0332517 in QMetaObject::invokeMethod (val9=..., val8=..., val7=..., val6=..., val5=..., val4=..., val3=..., val2=..., val1=..., val0=..., member=0x7f45d0345bff "addRepaintFull", obj=<optimized out>) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs.h:461
#8  KWin::EffectWindow::addRepaintFull (this=this@entry=0x3a8d1f0) at /workspace/build/libkwineffects/kwineffects.cpp:945
#9  0x00007f45d006831e in KWin::DimInactiveEffect::postPaintScreen (this=0x2bf1290) at /workspace/build/effects/diminactive/diminactive.cpp:157
#10 0x00007f45d3370181 in KWin::EffectsHandlerImpl::postPaintScreen (this=0x299bd10) at /workspace/build/effects.cpp:401
#11 0x00007f45d33631ca in KWin::Scene::paintScreen (this=this@entry=0x23d2c20, mask=mask@entry=0x7ffc0d542040, damage=..., repaint=..., updateRegion=updateRegion@entry=0x7ffc0d542010, validRegion=validRegion@entry=0x7ffc0d542020, projection=..., outputGeometry=...) at /workspace/build/scene.cpp:155
#12 0x00007f45aa8cde2f in KWin::SceneOpenGL::paint (this=0x23d2c20, damage=..., toplevels=...) at /workspace/build/plugins/scenes/opengl/scene_opengl.cpp:702
#13 0x00007f45d3354c0e in KWin::Compositor::performCompositing (this=0x1afede0) at /workspace/build/composite.cpp:745
#14 0x00007f45d0b71f73 in QObject::event (this=0x1afede0, e=<optimized out>) at kernel/qobject.cpp:1273
#15 0x00007f45d191139c in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x1afede0, e=0x7ffc0d542480) at kernel/qapplication.cpp:3727
#16 0x00007f45d1918ab0 in QApplication::notify (this=0x7ffc0d542770, receiver=0x1afede0, e=0x7ffc0d542480) at kernel/qapplication.cpp:3486
#17 0x00007f45d0b44228 in QCoreApplication::notifyInternal2 (receiver=0x1afede0, event=event@entry=0x7ffc0d542480) at kernel/qcoreapplication.cpp:1048
#18 0x00007f45d0b9a47e in QCoreApplication::sendEvent (event=0x7ffc0d542480, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:234
#19 QTimerInfoList::activateTimers (this=this@entry=0x1ab1db0) at kernel/qtimerinfo_unix.cpp:643
#20 0x00007f45d0b976bc in QEventDispatcherUNIXPrivate::activateTimers (this=this@entry=0x1ab1d10) at kernel/qeventdispatcher_unix.cpp:249
#21 0x00007f45d0b98422 in QEventDispatcherUNIX::processEvents (this=<optimized out>, flags=..., flags@entry=...) at kernel/qeventdispatcher_unix.cpp:514
#22 0x00007f45baa47cad in QUnixEventDispatcherQPA::processEvents (this=<optimized out>, flags=...) at qunixeventdispatcher.cpp:68
#23 0x00007f45d0b425ba in QEventLoop::exec (this=this@entry=0x7ffc0d542650, flags=..., flags@entry=...) at kernel/qeventloop.cpp:214
#24 0x00007f45d0b4b6c4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1336
#25 0x00007f45d10fcf8c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1762
#26 0x00007f45d19112f5 in QApplication::exec () at kernel/qapplication.cpp:2901
#27 0x00007f45d3abe1f9 in kdemain (argc=3, argv=0x7ffc0d542908) at /workspace/build/main_x11.cpp:468
#28 0x00007f45d370b830 in __libc_start_main (main=0x4006b0 <main(int, char**)>, argc=3, argv=0x7ffc0d542908, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc0d5428f8) at ../csu/libc-start.c:291
#29 0x00000000004006e9 in _start ()

Reported using DrKonqi