[Nouveau] [Bug 71659] [NVD9] Hangs under load with ![ PFIFO][0000:01:00.0] unhandled status 0x00800000

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71659

R.Palmer at bham.ac.uk changed:

           What    |Removed                     |Added
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                 CC|                            |jano.vesely at gmail.com

--- Comment #8 from R.Palmer at bham.ac.uk ---
This bug seemed to become harder to trigger when I installed git-as-of-Oct-26,
then easier again when I installed git-as-of-Nov-14, but given that this change
seemed to persist after returning to 3.11 (suggesting a left-behind
configuration change) and the general randomness of the bug, this would not
give a reliable bisection (so the date mismatch doesn't rule out #71662 being
the same bug).

In 3.8.0 the same symptoms occur but the log message is
nouveau ![   PFIFO][0000:01:00.0] unhandled status 0x01000000
I suspect (but have not tested) that this change was
http://cgit.freedesktop.org/nouveau/linux-2.6/commit/drivers/gpu/drm/nouveau/core/engine/fifo/nvc0.c?id=32256c87ead3edec86bed5023a0ff96a6d907931
,i.e. this error was what is now the warning.

Is 0x00800000 unhandled because it is an inherently fatal error, or because
nobody outside Nvidia knows what it means?
https://github.com/envytools/envytools/blob/master/hwdocs/fifo/nvc0-pfifo.rst
is a contentless stub.

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