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

[bugzilla-daemon at freedesktop.org]

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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