[Bug 65394] [SNB Bisected]igt/gem_hangcheck_forcewake cause [drm:i915_hangcheck_elapsed] *ERROR* bsd ring: stuck on addr 0x3b4

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65394

--- Comment #3 from Chris Wilson <chris at chris-wilson.co.uk> ---
This is a genuine hangcheck failure. The bsd ring is waiting upon the blt ring
which is chock full of busy work.

Mika, we should check to see if we are on a semaphore wait and discount that
stuck ring if its target ring is still busy and not yet past the seqno.

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