I can reproduce this bug on rv770.
It works fine on mesa 9.0.3 and 9.1.1

I've bisected to this commit:

ea63491629f48099371f725e7c3779f2982d7a52 is the first bad commit
commit ea63491629f48099371f725e7c3779f2982d7a52
Author: Marek Olšák <maraeo@gmail.com>
Date:   Thu Feb 7 04:36:33 2013 +0100

    st/mesa: accelerate glGetTexImage for all formats using a blit

    This commit allows using glGetTexImage during rendering and still
    maintain interactive framerates.

    This improves performance of WarCraft 3 under Wine. The framerate is
improved
    from 25 fps to 39 fps in the main menu, and from 0.5 fps to 32 fps in the
game.

    v2: fix choosing the format for decompression

What	Removed	Added
Severity	normal	critical
CC		andreas.boll.dev@gmail.com, maraeo@gmail.com
Summary	Half-Life 2: Deathmatch native version crashes	[bisected] Half-Life 2: Deathmatch native version crashes
Keywords		regression