I'm running slackware current and since a couple of month kwin randomly crashes and restarts. Before filing a bug report to KDE, can you help me doing a bit of troubleshooting to check if is something wrong with my installation?

For context i'm running kernel 5.18.5 and the crashes are very random, with no apparent logic and reproducibility. They might happen several time in the same day or not at all. I'll attach a backtrace of the crash as soon as I get to save one. Current branch is updated with nothing from /extra and multilib installed

Usually the KWin crashes because the graphics driver.

You can try to disable the desktop effects to see if you continue to see crashes.

I'm running the nvidia drivers (proprietary) version 515.48.07. The crashes did not started happening coinciding a change in graphic driver or graphic driver configuration. I tried upgrading the drivers after a month of the crashes to check if it would solve the problem, but that was not the case

Well, the Plasma5 issues with the NVidia proprietary drivers are, well... famous.

Try to disable the "desktop effects" for seeing if something changes:

System Settings -> Display and Monitor -> Compositor -> uncheck "Enable compositor on startup" -> Apply

Then reboot or logout/login.

I'm experiencing the same on intel UHD, and the crash brings the whole desktop down:

From /var/log/messages

Reported a bug upstream, in case you might want to chime in:

https://bugs.kde.org/show_bug.cgi?id=456894

Here my backtrace. I don't find the same segfault in dmesg you found. In my case what crashes is kwin_x11

https://pastebin.com/Um9Widj9

Man, did you disabled the desktop effects for testing, as I told you?

AND, you said that you use the NVIDIA proprietary graphics driver, BUT in backtrace seems like is used the Mesa's Intel Iris driver?

In the end, about what we talk? A laptop with Intel graphics and a discrete NVIDIA graphics card?

I still did not, I had this crash this morning and I found it worth sharing. I'm going to disable it this afternoon.

Anyway yes, is a laptop with intel graphics and NVIDIA discrete. To be exact is a Acer Nitro 5 N20C1

This is fraking important for debugging your issue, because the people will see if it's a KWin crash because of the graphics stack, OR you hit a particular other issue in Plasma5. BUT, most likely is a graphics driver issue.

Then, I have to decline my competence, as I have zero experience with NVIDIA Optimus hardware. Sorry!

BTW, did you use Bumblebee, right?

https://docs.slackware.com/howtos:ha...nvidia_optimus
https://wiki.archlinux.org/title/bumblebee

Until now, no crashes

Bumblebee is not mantained anymore since long time, I use direct offloading via Vulkan for application I need to use the GPU for

Then, seems like it's the Mesa's Intel Iris driver which creates you problems, assuming that's your main driver and used by KWin.

You can try to build yourself an upgraded package of Mesa - it's already long in tooth and our BDFL seems not that willing to upgrade it, for unknown reasons. The current release of Mesa is 22.1.4 .

There's where I posted a SlackBuild capable to work with latest Mesa stable release:

https://www.linuxquestions.org/quest...ml#post6366783

Just a curiosity, has our BDFL gave any feedback on this or just plain ignored?

Silenzio stampa.

And there is no guessable reason, as the new Mesa released versions are, well... released as usual.

The only difference is that since Mesa 22.0.x the Mesa classic drivers was dropped, and there are only Gallium drivers.

BUT, if someone builds them from Mesa 21.3.x in Amber mode, those classic drivers still works quite well on top of a modern Mesa - see the second SlackBuild in that post which I noted to you. Overall, those "shocking changes" are rather boring, from my practical experience.

Anyway, staying forever in Mesa 21.3.x is not an advantage for those who uses a modern hardware, i.e. the Intel Iris driver - but not limited to them, because Crocus gives now OpenGL 4.2 (and it's visible faster) on Intel Ivy Bridge graphics, while the old Mesa 21.3.8 (now in -current) gives OpenGL 3.0 for the same hardware.