(In reply to comment #17)
> (In reply to comment #16)
> > I haven't made any good progress with bisecting other than reconfirming that 
> > 
> > http://cgit.freedesktop.org/mesa/mesa/commit/
> > ?id=cb4ad1368551b64756c7b6e2007588e34739b188
> > 
> > fixes a segfault. This fix uncovers the lockup behavior.
> 
> The commit fixes code which isn't used by radeonsi. I guess the bisection
> went wrong.

That's sad to hear that my doubts in my test cases were not unfounded.

> > Marek: Can you provide more information on the other known problem?
> 
> Kernel 3.15-rc1 and later locks up randomly. There is a memory corruption
> when page tables are moved.

Please ping the bug when there is a fix I can try.