Bug 938469 – >=media-libs/mesa-24.2.0: Xvfb unable to use +extension GLX

• Status: UNCONFIRMED
• Product: Gentoo Linux

[Description Robert Schultz 2024-08-24 19:19:44 UTC]

Run this in a term: Xvfb :7783 +extension GLX -nolisten tcp -nocursor -ac -screen 0 1920x1080x24
Run this in another term: DISPLAY=:7783 glxinfo | head

Output should have direct rendering: Yes

With x11-base/xorg-server 21.1.13-r1 this works fine with media-libs/mesa-24.1.6 or lower
If you upgrade to media-libs/mesa-24.2.0 then the glxinfo command fails with Error: couldn't find RGB GLX visual or fbconfig.
Xvfb outputs zero debugging info or logs, but it's basically not able to load the GLX extension. This is on a headless server.

With mesa-24.1.6 the dir /usr/lib64/dri has:
-rwxr-xr-x   2 root root 13411008 Aug 24 14:25 kms_swrast_dri.so
-rwxr-xr-x   2 root root 13411008 Aug 24 14:25 swrast_dri.so


With mesa-24.2.0 the dir /usr/lib64/dri has:
lrwxrwxrwx   1 root root     14 Aug 24 14:22 kms_swrast_dri.so -> libdril_dri.so
-rwxr-xr-x   1 root root  84168 Aug 24 14:22 libdril_dri.so
lrwxrwxrwx   1 root root     14 Aug 24 14:22 swrast_dri.so -> libdril_dri.so


I'm not sure if this is an issue with Xvfb, mesa or Gentoo. Thoughts?

Reproducible: Always

[Comment 1 Paul Zander 2024-08-24 19:28:17 UTC]

Can you attach emerge --info media-libs/mesa and a 
> strace -e file Xvfb :7783 +extension GLX -nolisten tcp -nocursor -ac -screen 0 1920x1080x24

Running these commands works fine on multiple machines here. There were changes in mesa 24.2 that could relate though.

[Comment 2 Robert Schultz 2024-08-24 19:44:57 UTC]

Created attachment 901156 [details]
strace log of Xvfb with mesa-24.1.6 working

[Comment 3 Robert Schultz 2024-08-24 19:45:30 UTC]

Created attachment 901157 [details]
strace log of Xvfb with mesa-24.2.0 failing

[Comment 4 Robert Schultz 2024-08-24 19:49:12 UTC]

Created attachment 901158 [details]
emerge --info media-libs/mesa

(In reply to Paul Zander from comment #1)
> Can you attach emerge --info media-libs/mesa and a 
> > strace -e file Xvfb :7783 +extension GLX -nolisten tcp -nocursor -ac -screen 0 1920x1080x24
> 
> Running these commands works fine on multiple machines here. There were
> changes in mesa 24.2 that could relate though.

I've attached the strace logs. One with the working mesa-24.1.6 version installed and one with the failing mesa-24.2.0 installed. This is on the same system by the way. Also attached the emerge --info media-libs/mesa output

[Comment 5 Robert Schultz 2024-09-06 12:59:29 UTC]

This was reported upstream to mesa and it appears it was a regression on their side: https://gitlab.freedesktop.org/mesa/mesa/-/issues/11830