[Bug 99671] [v4.10 snb] weird seqno/request tracking - HEAD overtakes TAIL

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99671

--- Comment #60 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Josh Holland from comment #57)
> Got a hang (drm-tip d6a919d39), this time not in Chrome. I had the following
> DRM-related kernel config (gathered from previous comments and posted here
> for the next time I accidentally delete .config), hopefully I didn't leave
> anything important turned off.

I think that's actually a genuine userspace hang (in mesa), checking the
location of the RING_HEAD is consistent with our expectation and it doesn't
seem to have the same stray ACTHD or wacky retirements as earlier. (Still
slightly cautious as it took a while to spot the strange behaviour originally,
and I may be missing it here.)

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