I will look at your logs, but I figured I'd mention that I just
applied one last DRI fix to xorg-server-snap.  Also, if you built
MesaLib-dri with -ffast-math, try it without it, especially if you
used the assembly dispatch routines.  My committing it with
-ffast-math was in error.  I was getting tons of crashes before,
realized I'd built it with -ffast-math, rebuilt it, and now it's rock
solid.

I apologize for all of the rebuilding, but it's in pursuit of the
highest good. ;)

Regards,

--Blair