(In reply to comment #7)
> Created attachment 94142 [details]
> Diablo III Valgrind output
> 
> Thanks Ilia, that did the trick! I just grabbed the first few minutes of
> game play in Valgrind up until it started encountering the error that was
> popping previously.

I'm not a radeon guy, just a drive-by commenter, but I'm going to go ahead and
guess that this output is going to be of little use to anyone debugging :(

A trace with symbols in r600_dri would be much more useful. With what you
provided, we just know that the memory is allocated with malloc and calloc...
which is of little surprise.