(In reply to comment #16)
> My most stable test case is unfortunately the Mathematica welcome screen.
> After some 5 mins of work in Chrome followed by a couple of Mathematica
> restarts, like 5-10, the lockup or segfault happens. Geeqie didn't do
> anything for me.
> 
> 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.

> 
> Maybe apitrace is a way forward to generate something more testable.
> 
> 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.