Exhausts the system limit on open files and then tries to create
a new shmem-backed gem object. Linus Torvalds reported that this
blows up on a null obj->base.filp, but I can't reproduce this here:
http://lists.freedesktop.org/archives/intel-gfx/2014-January/038433.html
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
