Bug 485845

Created attachment 168712 [details]
log from journalctl, some repeated messages are omitted

SUMMARY

When opening a file from telegram-desktop from flatpak, the desktop portal should open a prompt asking which application to open it with. Instead, the entire desktop freezes, the gpu usage ramps up, and the screen gets filled with graphic artifacts. I was not able to replicate this on other applications but I doubt that telegram has the power to cause this behaviour.
I'm not sure if this is the desktop portal's or kwin's fault.

STEPS TO REPRODUCE
1. Send a file with telegram
2. Click "open with"
3. The desktop is frozen and in a few seconds it will start glitching

OBSERVED RESULT
The desktop is frozen and filled with artifacts

EXPECTED RESULT
I get a desktop portal prompt

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 39
(available in About System)
KDE Plasma Version: 6.0.4 (from copr)
KDE Frameworks Version: 6.1.0
Qt Version: 6.6.2

ADDITIONAL INFORMATION
I installed plasma 6 from this copr: https://copr.fedorainfracloud.org/coprs/solopasha/kde6/ if this is not reproducible I will post there.

Sometimes I'm able to switch to a tty, if I do, I'm able to run glmark2_drm so I doubt it's the gpu that's broken. If I do a soft-reboot with systemd, the system recovers. I don't know how to properly restart just the desktop on wayland, but I would try that. If I just kill plasmadesktop and kwin_wayland and let them get restarted on their own it doesn't recover properly.
With nvtop on tty I can see the gpu usage is at 100%, on one occasion it also filled the vram, but the entire system started misbehaving (couldn't connect with ssh, the prompt on the tty froze).

I found some seemingly related logs on journalctl, they are attached.
This is what I found, but if needed I will provide more info.