Public bug reported:

As of Ubuntu 20.04, on intel graphics with intel driver (not
modesetting), I got segfault whenever anything tries to use GL.

This happens unless I export MESA_LOADER_DRIVER_OVERRIDE=i965. One says
that it does not happen with modesetting driver.

(gdb) run
Starting program: /usr/bin/glxgears 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff17cf700 (LWP 97070)]
[New Thread 0x7fffebfff700 (LWP 97071)]
[New Thread 0x7ffff0fce700 (LWP 97072)]
[New Thread 0x7fffeb7fe700 (LWP 97073)]

Thread 1 "glxgears" received signal SIGSEGV, Segmentation fault.
0x00007ffff6a7e1d4 in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
(gdb) where
#0  0x00007ffff6a7e1d4 in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#1  0x00007ffff6c42de4 in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#2  0x00007ffff6a59e5d in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#3  0x00007ffff6a5aa95 in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#4  0x00007ffff6099774 in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#5  0x000055555555711e in ?? ()
#6  0x0000555555556c88 in ?? ()
#7  0x00007ffff7ace0b3 in __libc_start_main (main=0x555555556410, argc=1, 
argv=0x7fffffffe698, init=<optimized out>, fini=<optimized out>, 
rtld_fini=<optimized out>, stack_end=0x7fffffffe688) at ../csu/libc-start.c:308
#8  0x0000555555556f0a in ?? ()
(gdb) 

I believe, this is a bug in mesa tracked here:
https://gitlab.freedesktop.org/mesa/mesa/issues/1358

packages versions:
libgl1-mesa-dri:amd64                 20.0.4-2ubuntu1                     amd64 
xserver-xorg-video-intel              2:2.99.917+git20200226-1            amd64
xserver-xorg-core                     2:1.20.8-2ubuntu2                   amd64

** Affects: mesa (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1877879

Title:
  segfault in iris_dri.so

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