Application: kwin_x11 (5.19.5)

Qt Version: 5.15.1
Frameworks Version: 5.75.0
Operating System: Linux 5.8.18-300.fc33.x86_64 x86_64
Windowing system: X11
Distribution: Fedora 33 (KDE Plasma)

-- Information about the crash:
- What I was doing when the application crashed:
I was switching between a virtual console (with Ctrl+Alt+F2) and the desktop.  When I switched back from the console to the desktop, I got the message that Kwin crashed.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault

[KCrash Handler]
#4  0x00007fb194d48bb2 in KWin::WindowQuadList::makeInterleavedArrays(unsigned int, KWin::GLVertex2D*, QMatrix4x4 const&) const () from /lib64/libkwineffects.so.12
#5  0x00007fb18006deb8 in KWin::OpenGLWindow::performPaint(int, QRegion const&, KWin::WindowPaintData const&) () from /usr/lib64/qt5/plugins/org.kde.kwin.scenes/KWinSceneOpenGL.so
#6  0x00007fb195563539 in KWin::ContrastEffect::drawWindow(KWin::EffectWindow*, int, QRegion const&, KWin::WindowPaintData&) () from /lib64/libkwin4_effect_builtins.so.1
#7  0x00007fb196e7d321 in KWin::EffectsHandlerImpl::drawWindow(KWin::EffectWindow*, int, QRegion const&, KWin::WindowPaintData&) () from /lib64/libkwin.so.5
#8  0x00007fb1954df475 in KWin::BlurEffect::drawWindow(KWin::EffectWindow*, int, QRegion const&, KWin::WindowPaintData&) () from /lib64/libkwin4_effect_builtins.so.1
#9  0x00007fb196e7d321 in KWin::EffectsHandlerImpl::drawWindow(KWin::EffectWindow*, int, QRegion const&, KWin::WindowPaintData&) () from /lib64/libkwin.so.5
#10 0x00007fb196e7d321 in KWin::EffectsHandlerImpl::drawWindow(KWin::EffectWindow*, int, QRegion const&, KWin::WindowPaintData&) () from /lib64/libkwin.so.5
#11 0x00007fb196e84603 in KWin::EffectsHandlerImpl::paintWindow(KWin::EffectWindow*, int, QRegion const&, KWin::WindowPaintData&) () from /lib64/libkwin.so.5
#12 0x00007fb196e84603 in KWin::EffectsHandlerImpl::paintWindow(KWin::EffectWindow*, int, QRegion const&, KWin::WindowPaintData&) () from /lib64/libkwin.so.5
#13 0x00007fb195506531 in KWin::DimInactiveEffect::paintWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () from /lib64/libkwin4_effect_builtins.so.1
#14 0x00007fb196e84603 in KWin::EffectsHandlerImpl::paintWindow(KWin::EffectWindow*, int, QRegion const&, KWin::WindowPaintData&) () from /lib64/libkwin.so.5
#15 0x00007fb196ee9d70 in KWin::Scene::paintWindow(KWin::Scene::Window*, int, QRegion const&, KWin::WindowQuadList const&) () from /lib64/libkwin.so.5
#16 0x00007fb196eeb0a7 in KWin::Scene::paintSimpleScreen(int, QRegion const&) () from /lib64/libkwin.so.5
#17 0x00007fb196e8455a in KWin::EffectsHandlerImpl::paintScreen(int, QRegion const&, KWin::ScreenPaintData&) () from /lib64/libkwin.so.5
#18 0x00007fb196e8455a in KWin::EffectsHandlerImpl::paintScreen(int, QRegion const&, KWin::ScreenPaintData&) () from /lib64/libkwin.so.5
#19 0x00007fb196e8455a in KWin::EffectsHandlerImpl::paintScreen(int, QRegion const&, KWin::ScreenPaintData&) () from /lib64/libkwin.so.5
#20 0x00007fb196ee8322 in KWin::Scene::paintScreen(int*, QRegion const&, QRegion const&, QRegion*, QRegion*, QMatrix4x4 const&, QRect const&, double) () from /lib64/libkwin.so.5
#21 0x00007fb18006623e in KWin::SceneOpenGL::paint(QRegion const&, QList<KWin::Toplevel*> const&) () from /usr/lib64/qt5/plugins/org.kde.kwin.scenes/KWinSceneOpenGL.so
#22 0x00007fb196e5a2b7 in KWin::Compositor::performCompositing() () from /lib64/libkwin.so.5
#23 0x00007fb195c0bd7f in QObject::event(QEvent*) () from /lib64/libQt5Core.so.5
#24 0x00007fb1965da15f in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#25 0x00007fb195be4be8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib64/libQt5Core.so.5
#26 0x00007fb195c2edd3 in QTimerInfoList::activateTimers() () from /lib64/libQt5Core.so.5
#27 0x00007fb195c2d2ef in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#28 0x00007fb18294d64e in QXcbUnixEventDispatcher::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5XcbQpa.so.5
#29 0x00007fb195be364b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#30 0x00007fb195beb010 in QCoreApplication::exec() () from /lib64/libQt5Core.so.5
#31 0x0000563d42a10f83 in main ()
[Inferior 1 (process 2610) detached]

The reporter indicates this bug may be a duplicate of or related to bug 399499.

Possible duplicates by query: bug 428473, bug 423295, bug 422028, bug 421666, bug 420372.

Reported using DrKonqi