[Intel-gfx] [PATCH 2/2] drm/i915: Track the previous pinned context inside the request

[Chris Wilson]

On Wed, Apr 20, 2016 at 03:08:19PM +0100, Tvrtko Ursulin wrote:
> Otherwise execlists_check_remove_request when accessing
> head_req->ctx is use after free. And I can demonstrate that easily
> via gem-close-race. Put a
> WARN_ON(atomic_read(&head_req->ctx->ref.refcount) == 0); and see. :)

More to the point, could we do a 10s burst of close race for BAT. What's
the likelihood of that capturing such faults?
With lockdep/kmemcheck etc enabled?
-Chris
 

-- 
Chris Wilson, Intel Open Source Technology Centre