[Bug 111862] [CI][DRMTIP] igt at gem_exec_await@wide-contexts - dmesg-warn - WARNING: possible circular locking dependency detected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111862

--- Comment #4 from Chris Wilson <chris at chris-wilson.co.uk> ---
So I think the suspect is:

__unwind_incomplete_requests:

                        /*
                         * Decouple the virtual breadcrumb before moving it
                         * back to the virtual engine -- we don't want the
                         * request to complete in the background and try
                         * and cancel the breadcrumb on the virtual engine
                         * (instead of the old engine where it is linked)!
                         */
                        if (test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT,
                                     &rq->fence.flags)) {
                                spin_lock(&rq->lock);
                                i915_request_cancel_breadcrumb(rq);
                                spin_unlock(&rq->lock);
                        }

That would be an extremely rare path to hit, so would be rarely seen by
lockdep.

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