It would be useful to have a backtrace with full debug symbols. Can you pleast 
install the following packages:
libgl1-mesa-dri-dbg libc6-dbg xserver-xorg-core-dbg xserver-xorg-video-ati-dbg

And then if the crash happens again just copy the backtrace like you did
before and hopefully we'll get names of functions instead of
"/usr/lib/dri/r300_dri.so [0x7f90a57ff9e8]" etc.

FWIW, I searched the upstream bugzilla for "_swrast_DrawPixels" and also
for "_mesa_DrawPixels" but I did not find any radeon related crashes
that involved those functions. If you can find repro steps that trigger
this bug that would extremely useful for filing an upstream bug report
at bugs.freedesktop.org

-- 
Sudden X.org crashes on Radeon card
https://bugs.launchpad.net/bugs/363439
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