https://bugs.freedesktop.org/show_bug.cgi?id=44800

--- Comment #7 from Michel Dänzer <mic...@daenzer.net> 2012-01-16 03:23:43 PST 
---
The panic backtrace doesn't look obviously related to the radeon driver — all
the symptoms sound like something might be scribbling more or less randomly
over memory.

I wonder if the line

 mtrr: type mismatch for e0000000,10000000 old: write-back new: write-combining

in dmesg might be relevant. Can you try resolving that, e.g. using
https://linuxindetails.wordpress.com/2010/06/27/mtrr-type-mismatch-for-e000000010000000-old-write-back-new-write-combining/
and see if that helps? Might be interesting seeing the contents of /proc/mtrr
before and afterwards (if it changes).

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