Nouveau - Jan 2017 - [Bug 99289] New: Display freezes after "gr: TRAP ch 6"

https://bugs.freedesktop.org/show_bug.cgi?id=99289

            Bug ID: 99289
           Summary: Display freezes after "gr: TRAP ch 6"
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: afn2 at cornell.edu
        QA Contact: xorg-team at lists.x.org

Created attachment 128783
  --> https://bugs.freedesktop.org/attachment.cgi?id=128783&action=edit
dmesg showing error

Intermittently (a few times a day), my display will completely freeze and
doesn't recover. Although the kernel doesn't hang and I can ssh in, I
can't
chvt to a non-graphical VT.

Whenever this occurs, I see a message like this in dmesg:

[12535.260195] nouveau 0000:01:00.0: gr: TRAP ch 6 [007f778000 Xwayland[854]]
[12535.260211] nouveau 0000:01:00.0: gr: GPC0/TPC1/MP trap: global 00000000 []
warp 3d0001 [STACK_ERROR]
[12539.595312] nouveau 0000:01:00.0: fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT]
[12539.595318] nouveau 0000:01:00.0: fifo: gr engine fault on channel 5,
recovering...

Despite the "recovering..." message it never actually recovers and
only a
reboot solves the problem.

I'm using GNOME on Wayland, and I'm typically running gnome-terminal,
Firefox,
and/or Chromium. So far I haven't identified any specific action that
triggers
this failure.

My computer is a mid-2014 Macbook Pro with a GeForce 750M (GK107). I'm
running
nouveau with "nouveau.nofbaccel=1". I've tried adding
"nouveau.config=NvGrUseFW=1" but it complains about not finding
/lib/firmware/nvidia/gk107/fecs_inst.bin. Is there an external firmware blob
available for this card?

I recently updated my kernel and several relevant packages, and have seen no
difference in behavior. I'm running linux 4.9.0, and the latest version of
mesa
from git (36b5f1d200).

See my attached dmesg output. Is there any debug flag I can enable to shed more
light on the situation?

Thanks!
Tony

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--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
To answer your immediate question about firmware, you can get blob firmware by
following the insturctions at

https://nouveau.freedesktop.org/wiki/VideoAcceleration/#firmware

to the letter. Unfortunately I think that linux 4.9 wants some of these to be
renamed, but there's a patch to fix it to look for the "old" names
as well:

https://github.com/skeggsb/linux/commit/e137040e0d0376b404fc5155eba44ea07126e3bd.patch

Should be included in a later 4.9.x release.

However I'm only aware of the blob firmware fixing issues for some GTX 660
owners.

nofbaccel=1 is unlikely to be of much help - that disables acceleration of the
fbdev device for your terminals.

Note that there are additional patches in Linux 4.10-rc1+ which are likely to
improve stability, such as

https://github.com/skeggsb/linux/commit/b27add13f500469127afdf011dbcc9c649e16e54.patch

and you might also want this one, although it'll be a little annoying to
apply
to upstream tree:

https://github.com/skeggsb/nouveau/commit/b3816f34944ad4824d345b98c323a30710f492d4.patch

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--- Comment #2 from afn2 at cornell.edu ---
Thanks for the quick reply! That's all very informative, especially the bit
about the firmware filenames. (I was wondering why the filenames in
/lib/firmware/nouveau were so different from the ones in /lib/firmware/nvidia!)

I'll give those patches a shot and follow up with an update soon.

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Martin Peres <martin.peres at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |MOVED
             Status|NEW                         |RESOLVED

--- Comment #3 from Martin Peres <martin.peres at free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
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You can subscribe and participate further through the new bug through this link
to our GitLab instance:
https://gitlab.freedesktop.org/xorg/driver/xf86-video-nouveau/issues/313.

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