(In reply to DJ Dunn from comment #168)
> if this helps any, I've been seeing the same error on my gentoo box, its
> near constant on 3.16+ kernels within 2 or 3 min of loging in X but, ive
> been seeing it very rarely (once every few hours) on 3.14.22 but still
> seeing it, and I never seen it happen on 3.14.19
> 
> gentoo box with mesa-10.3.1 xorg-server-1.16.1

Could you test 3.14.20 and 3.14.21, to see if the issue also occur in any of
those, then do a bisection between the first version where the crashes started
to occur, and the version prior to it?