(In reply to comment #25)
> Created attachment 71346 [details] [review] [review]
> possible fix
> 
> Try this patch.  It re-emits most of the invariant state at draw time.  If
> it helps, please try commenting out (change the #if 1 to #if 0) each new
> section until you are able to trigger the lock ups again so we can narrow
> down which state needs to be re-emitted at draw time.

In my case it didn't help, although I had the impression it took longer before
it hang (could also be random?)