SUMMARY

I am using an nvidia gpu with wayland. When I try to logout instead of returning to sddm the desktop restarts and I can no longer click the log off button (https://bugs.kde.org/show_bug.cgi?id=449948).

The problem does not appear when using the X11 session.

Backtrace:

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  0x00007f9a13547358 in ?? () from /usr/lib/libkwin.so.5
[Current thread is 1 (Thread 0x7f9a0c791880 (LWP 8633))]
(gdb) bt
#0  0x00007f9a13547358 in  () at /usr/lib/libkwin.so.5
#1  0x00007f9a13392f4e in  () at /usr/lib/libkwin.so.5
#2  0x00007f9a13366cd7 in  () at /usr/lib/libkwin.so.5
#3  0x00007f9a135aa8b8 in  () at /usr/lib/libkwin.so.5
#4  0x00007f9a1360f414 in  () at /usr/lib/libkwin.so.5
#5  0x00007f9a103da8ba in  () at /usr/lib/libwayland-server.so.0
#6  0x00007f9a103dafdb in wl_client_destroy () at /usr/lib/libwayland-server.so.0
#7  0x00007f9a103db1f7 in wl_display_destroy_clients () at /usr/lib/libwayland-server.so.0
#8  0x00007f9a13597339 in KWaylandServer::Display::~Display() () at /usr/lib/libkwin.so.5
#9  0x00007f9a134b805d in  () at /usr/lib/libkwin.so.5
#10 0x00007f9a11ab3bd5 in QObjectPrivate::deleteChildren() () at /usr/lib/libQt5Core.so.5
#11 0x00007f9a11ab4399 in QObject::~QObject() () at /usr/lib/libQt5Core.so.5
#12 0x00007f9a134b928e in KWin::WaylandServer::~WaylandServer() () at /usr/lib/libkwin.so.5
#13 0x00007f9a11ab3bd5 in QObjectPrivate::deleteChildren() () at /usr/lib/libQt5Core.so.5
#14 0x00007f9a11ab4399 in QObject::~QObject() () at /usr/lib/libQt5Core.so.5
#15 0x000055579c055165 in  ()
#16 0x00007f9a10a3c290 in  () at /usr/lib/libc.so.6
#17 0x00007f9a10a3c34a in __libc_start_main () at /usr/lib/libc.so.6
#18 0x000055579c056c95 in  ()

STEPS TO REPRODUCE
1.  Login to kde wayland session
2.  Attempt to logout

OBSERVED RESULT
KDE desktop restarts and is fully functional except for logout button now freezing everything.

EXPECTED RESULT
Return to SDDM.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.26.4
KDE Frameworks Version: 5.101.0
Qt Version: 5.15.7
Graphics Platform: Wayland

ADDITIONAL INFORMATION