SUMMARY
On my setup with kwin-wayland the compositor randomly crashes, both during activity and idle.
I have found no other reports of a similar case.


STEPS TO REPRODUCE
None, just wait a few hours until it randomly crashes.


SOFTWARE/OS VERSIONS
Operating System: CachyOS 
KDE Plasma Version: 5.27.2
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
Kernel Version: 6.2.5-3-cachyos (64-bit)
Graphics Platform: Wayland

ADDITIONAL INFORMATION

Output of backtrace from coredumpctl gdb:
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Core was generated by `/usr/bin/kwin_wayland --wayland-fd 7 --socket wayland-0 --xwayland-fd 8 --xwayl'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f16bec08d24 in KWaylandServer::OutputInterface::handle() const () from /usr/lib/libkwin.so.5
[Current thread is 1 (Thread 0x7f16b76d3d80 (LWP 569257))]
(gdb) bt
#0  0x00007f16bec08d24 in KWaylandServer::OutputInterface::handle() const () at /usr/lib/libkwin.so.5
#1  0x00007f16bebf7f30 in  () at /usr/lib/libkwin.so.5
#2  0x00007f16bebf82da in  () at /usr/lib/libkwin.so.5
#3  0x00007f16bd0d1470 in  () at /usr/lib/libQt5Core.so.5
#4  0x00007f16be9cbc6e in KWin::Output::setState(KWin::Output::State const&) () at /usr/lib/libkwin.so.5
#5  0x00007f16bebabb0f in KWin::DrmOutput::updateDpmsMode(KWin::Output::DpmsMode) () at /usr/lib/libkwin.so.5
#6  0x00007f16bebabde2 in KWin::DrmOutput::setDrmDpmsMode(KWin::Output::DpmsMode) () at /usr/lib/libkwin.so.5
#7  0x00007f16bd0d1470 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f16bd0d3c1f in QTimer::timeout(QTimer::QPrivateSignal) () at /usr/lib/libQt5Core.so.5
#9  0x00007f16bd0c3b4e in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#10 0x00007f16bc57a65c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#11 0x00007f16bd09e588 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#12 0x00007f16bd0ed4d2 in QTimerInfoList::activateTimers() () at /usr/lib/libQt5Core.so.5
#13 0x00007f16bd0edd62 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#14 0x0000555c37953432 in  ()
#15 0x00007f16bd09686c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#16 0x00007f16bd0a1a53 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#17 0x0000555c378623e1 in  ()
#18 0x00007f16bbc23990 in  () at /usr/lib/libc.so.6
#19 0x00007f16bbc23a4a in __libc_start_main () at /usr/lib/libc.so.6
#20 0x0000555c37864185 in  ()