I’ve been seeing a KDE bug in Fedora 41 under KDE 6.2.5
The problem is the crash is so bad it’s impossible to send a report. The system hangs so hard all I can do is press the power button 5 seconds to do a hard poweroff.
Virtual consoles keypresses are ignored, C+A+D is ignored and C+A+bspace (which I set to restart the desktop “key sequence to kill x server”) is ignored too.
Basically it happens when the mouse touches the top edge of the screen and it’s rare (the mouse can touch the top edge many times without crashing). I’ve never seen a hang like this at the bottom or left/right edges.
Are you using the X11 session, or Wayland? Is the system fully up to date and have you rebooted after applying all available updates?
Does it happen in a new clean user account?
It would be nearly impossible to get to happen on purpose, I’d have to create a new account and continuously use it for like a week or two. It’s not deterministic, I avoid it by trying to not hit the top of the screen with the mouse.
So it’s not happening 100% of the time? The original post made me think it was.
I wrote
“and it’s rare (the mouse can touch the top edge many times without crashing).”
I meant literally it rarely happens.
I suppose I could try “hammering” at the top of the screen with this mouse and see if I can get it happening. I try to avoid that because it’s dangerous (dirty downing the system could make a filesystem problem)
one thing I do remember, when it hangs it’s always when I’m dragging a window AND at the top of the screen. So the mouse is showing the “grabbing hand” instead of the arrow pointer.
Ahh, I had a feeling. I experienced this a few weeks ago but it went away after rebuilding everything from source. It might be that a package was forgotten to be rebuilt in Fedora.
I was just now able to get it to happen, I was dragging a Konsole window around so the mouse “hand” was at the top screen edge. I kept doing that a long time and it crashed. The system hangs hard but the youtube video I was playing kept going (I could hear the audio). But none of these work:
Ctrl+Alt+F# (no access to virtual consoles)
Ctrl+Alt+backspace (hot key for kill x server/wayland).
So I pressed the power button.
I do have a plasmoid up in that area (an “Activity Pager” and a few firefox icons), but the crash wasn’t when the mouse over directly over the pager
“kinfo” is:
Operating System: Fedora Linux 42
KDE Plasma Version: 6.2.90
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.2
Kernel Version: 6.14.0-0.rc1.15.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 4800H with Radeon Graphics
Memory: 15.0 GiB of RAM
Graphics Processor 1: AMD Radeon Graphics
Graphics Processor 2: AMD Radeon RX 5500M
It does, I just now created a new account and logged and changed nothing (did no customizations). I only walked it through the Welcome panel (“Next” for everything). I then tried dragging a Konsole along the top edge and it hanged the machine similar to my old account.
For what it’s worth, if the “Crashed Processes Viewer” screen isn’t showing up, it might still be possible to produce a backtrace for a crash report using the coredumpctl method described here: Guidelines and HOWTOs/Debugging/How to create useful crash reports - KDE Community Wiki