I've just tried new mesa/master and it doesn't crash anymore. Problem goes back
to stage 2 (see pics), but:
-----
EE r600_texture.c:326 r600_texture_get_fmask_info - Got error in surface_init
while allocating FMASK.
-----
is still present. 

Probably is like smoki said, dri3 is problem here and if there's no official
support for dri3, should we really care about it for now?