(In reply to comment #47)
> (In reply to comment #40)
> > I am also seeing the corruption on Mesa 10.0.1.
> 
> Same here: lots of flickering textures. rv730 (HD4xxx).
> 
> Present with the tip of the master branch. Not influenced by 7948ed1250.
> So far I haven't been able to find a revision that does *not* show the
> flickering. I went as far back as December 2012.

Please set this environment variable:

R600_DEBUG=nodma,nocpdma

and tell us if it fixes anything.