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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI][DRMTIP] igt@gem_exec_await@wide-contexts - dmesg-warn - WARNING: possible circular locking dependency detected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111862#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI][DRMTIP] igt@gem_exec_await@wide-contexts - dmesg-warn - WARNING: possible circular locking dependency detected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111862">bug 111862</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>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.</pre>
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