Comment # 26 on bug 91278 from Michel Dänzer

(In reply to Andy Furniss from comment #25)
> I also see a new R600_DEBUG=check_vm in mesa. I don't know what, if any,
> extra info is expected from that, but testing valley with it caused it to
> quit when it hit a fault after a about minute of running -

It should generate a file in ~/ddebug_dumps/ with more information about the VM
fault.