Application: kwin_x11 (5.14.5)

Qt Version: 5.12.0
Frameworks Version: 5.54.0
Operating System: Linux 4.20.7-1-MANJARO x86_64
Distribution: "Manjaro Linux"

-- Information about the crash:
Not sure what causes this, but when I launch a game from steam ( without using Proton nor wine ) on a multi-monitor configuration, KWin crash then restarts. Everythings still works normally after, except some visual glitch on the miniature box with icons from GTK app.

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin_x11), signal: Aborted
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f3522bdd840 (LWP 933))]

Thread 5 (Thread 0x7f3508eaf700 (LWP 1047)):
#0  0x00007f3529392afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f352a09328c in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f352a0932a9 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f352938ca9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f352bc17b23 in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f350b262700 (LWP 1037)):
#0  0x00007f3529392afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f350b7febe4 in  () at /usr/lib/dri/i965_dri.so
#2  0x00007f350b7fe908 in  () at /usr/lib/dri/i965_dri.so
#3  0x00007f352938ca9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f352bc17b23 in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f351a1c3700 (LWP 1033)):
#0  0x00007f352bc0cd16 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f352a7b746b in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f352a7b894b in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f352a76458c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f352a5a85c9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f3528b50b89 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007f352a5a99cc in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f352938ca9d in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f352bc17b23 in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f351bfff700 (LWP 1018)):
#0  0x00007f352bc0cd16 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f352a7b746b in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f352a7b894b in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f352a76458c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f352a5a85c9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f35285b8ba6 in  () at /usr/lib/libQt5DBus.so.5
#6  0x00007f352a5a99cc in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f352938ca9d in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f352bc17b23 in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f3522bdd840 (LWP 933)):
[KCrash Handler]
#6  0x00007f352bb53d7f in raise () at /usr/lib/libc.so.6
#7  0x00007f352bb3e672 in abort () at /usr/lib/libc.so.6
#8  0x00007f352bb3e548 in _nl_load_domain.cold.0 () at /usr/lib/libc.so.6
#9  0x00007f352bb4c396 in  () at /usr/lib/libc.so.6
#10 0x00007f352922ac30 in  () at /usr/lib/libepoxy.so.0
#11 0x00007f3529283520 in  () at /usr/lib/libepoxy.so.0
#12 0x00007f352927141a in  () at /usr/lib/libepoxy.so.0
#13 0x00007f352a216149 in  () at /usr/lib/libkwin4_effect_builtins.so.1
#14 0x00007f352a2161d9 in  () at /usr/lib/libkwin4_effect_builtins.so.1
#15 0x00007f352a78e1cb in QObjectPrivate::deleteChildren() () at /usr/lib/libQt5Core.so.5
#16 0x00007f352a797185 in QObject::~QObject() () at /usr/lib/libQt5Core.so.5
#17 0x00007f352a212f09 in  () at /usr/lib/libkwin4_effect_builtins.so.1
#18 0x00007f352b99dcaa in KWin::EffectsHandlerImpl::unloadAllEffects() () at /usr/lib/libkwin.so.5
#19 0x00007f352b99dd48 in KWin::EffectsHandlerImpl::~EffectsHandlerImpl() () at /usr/lib/libkwin.so.5
#20 0x00007f3520301239 in  () at /usr/lib/qt/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#21 0x00007f3520301309 in  () at /usr/lib/qt/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#22 0x00007f352b97e5af in  () at /usr/lib/libkwin.so.5
#23 0x00007f352b97eb6d in KWin::Compositor::suspend(KWin::Compositor::SuspendReason) () at /usr/lib/libkwin.so.5
#24 0x00007f352a790b62 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#25 0x00007f352b12de34 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#26 0x00007f352b135671 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#27 0x00007f352a7658f9 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#28 0x00007f352a768998 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#29 0x00007f352a7b87bd in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#30 0x00007f352278fd4f in  () at /usr/lib/libQt5XcbQpa.so.5
#31 0x00007f352a76458c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#32 0x00007f352a76c896 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#33 0x00007f352bce9b26 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so
#34 0x00007f352bb40223 in __libc_start_main () at /usr/lib/libc.so.6
#35 0x000055ceba66105e in _start ()
[Inferior 1 (process 933) detached]

Reported using DrKonqi