[Bug 111862] [CI][DRMTIP] igt at gem_exec_await@wide-contexts - dmesg-warn - WARNING: possible circular locking dependency detected
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Fri Oct 4 19:36:03 UTC 2019
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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