After some tests, I see the same error in VirtualBox with Ubuntu 9.04b2 x386.
After some investigation, the cause is (for both 9.04b2 x86 and amd64) the 
presence of drm modules added by "virtual box guest additions" while the 
checkbox "3D acceleration" is not ticked in VM preferences.
I also learn that you cannot tick "3D acceleration" on many VM at the same time 
(even if they are not launched at the same time).

So if 3D acceleration is not ticked (or automatically unticked by vbox), 
launching Ubuntu with the guest addition modules that enable direct rendering 
makes glxinfo crash at session start.
If you launch glxinfo "manually" (term) in these conditions, the first lines 
diplay a warning about driect rendering not possible then you get all glxinfo 
stuff.

Conclusion : a small bug remain : if glxinfo is able to display a
warning without crashing when launched in a term, why does it crash at
session start ?

-- 
glxinfo crashed with SIGSEGV
https://bugs.launchpad.net/bugs/185785
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