Created attachment 37445 [details] Backtrace of the crash Celestia 1.6.0 segfaults on start (in DRI1/UMS) with current mesa from git (head cd601513f5ff4f488a6f6527bb033e39ee62ffda). I didn't bisect yet but the problem started last week with the glx rework. I'm using a Radeon X550 (RV370) with mesa and xf86-video-ati from git, xorg-server 1.8.2 and kernel 2.6.34.1. Full backtrace attached.
Should be fixed by: commit e3e25dee2019b2c75acadeaf4358cd9a8d93db0b Author: Kristian Høgsberg <krh@bitplanet.net> Date: Thu Jul 29 18:48:51 2010 -0400 glx: Fix copy/paste bug in glXWaitX and glXWaitGL https://bugs.freedesktop.org/show_bug.cgi?id=29304
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