[Bug 67597] New: nouveau E Xorg failed to idle channel on NVA0

[Bug 67597] New: nouveau E Xorg failed to idle channel on NVA0

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=67597

          Priority: medium
            Bug ID: 67597
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
           Summary: nouveau E Xorg failed to idle channel on NVA0
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org
          Severity: critical
    Classification: Unclassified
                OS: Linux (All)
          Reporter: m.meledandri-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/nouveau
           Product: xorg

Created attachment 83404
  --> https://bugs.freedesktop.org/attachment.cgi?id=83404&action=edit
dmesg-nouveau-crasher-idle-fail

Shortly after resume from suspend on kernel 3.10.4, nouveau crashes (hard
lockup). This is the first nouveau crash I've seen since using xfwm4 and no
compositing. I've been hanging out on the 3.4.x LTS series though, so it's been
safe. 

dmesg attached.

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[Bug 67597] nouveau E Xorg failed to idle channel on NVA0

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https://bugs.freedesktop.org/show_bug.cgi?id=67597

--- Comment #1 from Emil Velikov <emil.l.velikov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Hi Marc

Would you be able to bisect this issue ? Hopefully the fix will be more trivial
than the i2c one you've reported :]

Cheers
Emil

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[Bug 67597] nouveau E Xorg failed to idle channel on NVA0

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https://bugs.freedesktop.org/show_bug.cgi?id=67597

--- Comment #2 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
Actually all the fence stuff was redone between... 3.4 and 3.5 or 3.5 and 3.6
(sorry, I forgot), and that created regressions for at least one other user (on
a nvc0 card though). The unfortunate thing is that the fence redo actually had
some suspend bugs in it that were fixed over time (but I guess not all of
them!) so this may end up being tricky to bisect, if you indeed zero in on
those fence commits.

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[Bug 67597] nouveau E Xorg failed to idle channel on NVA0

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https://bugs.freedesktop.org/show_bug.cgi?id=67597

--- Comment #3 from Marc Meledandri <m.meledandri-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Hi, I may try to biscect this but won't be able to get it done soon. There are
a couple of hurdles to testing...

1) The bug itself causes a hard lockup requiring poweroff. I use a Crucial M4
SSD which has a known issue with power loss condition where it becomes
unusable. This is risky, so I'll need to image my install over to an external
drive to test the biscec kernel builds.

2) There is no reliable steps to reproduce the issue. I was running 3.10.3 for
several days with multiple suspend cycles prior to triggering this crasher. I'm
not sure I can dedicate the time to this. As much as I'd like to help the
nouveau driver have one less bug, the gpu in question is aged and I have to
just let this one slide as it's pretty low priority for newer kernels I'd
assume :]

Please leave this report open. I'll try to update it at some point with results
of a bisect. Can I bisect the mainline tree, or must I use the nouveau git
tree?

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[Bug 67597] nouveau E Xorg failed to idle channel on NVA0

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=67597

--- Comment #4 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
Shouldn't matter -- the trees are identical for the purpose of bisection. I bet
running glxgears while suspending will help trigger it more often. Also, it's
interesting that it's a hard hang. I would have expected X to die and come
back... can you not, e.g., ssh in when this happens?

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[Bug 67597] nouveau E Xorg failed to idle channel on NVA0

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https://bugs.freedesktop.org/show_bug.cgi?id=67597

--- Comment #5 from Marc Meledandri <m.meledandri-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Thanks for the info. Unfortunately, it's a CPU hard lockup - no ssh
connectivity and cannot sysrq out safely. Additionally, I've got a raid that
doesn't get synced on this crash, on top of the SSD issue, so this becomes
quite troublesome.

I had reported a similar nouveau crasher via downstream Debian BTS last year.
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=696554

That's why I switched over to XFCE and build my own vanilla 3.4.x kernels +
i2c/pwm patch.

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[Bug 67597] nouveau E Xorg failed to idle channel on NVA0

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https://bugs.freedesktop.org/show_bug.cgi?id=67597

--- Comment #6 from Marc Meledandri <m.meledandri-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Thanks Ilia...glxgears while resuming from suspend triggered the crash on the
first attempt. I'll get a test install up and running and start bisecting this
soon.

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[Bug 67597] nouveau E Xorg failed to idle channel on NVA0

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https://bugs.freedesktop.org/show_bug.cgi?id=67597

--- Comment #7 from Marc Meledandri <m.meledandri-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Okay, I created a test environment and bisected this problem:

4f6029da58ba9204c98e33f4f3737fe085c87a6f is the first bad commit
commit 4f6029da58ba9204c98e33f4f3737fe085c87a6f
Author: Ben Skeggs <bskeggs-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Date:   Fri Nov 16 11:54:31 2012 +1000

    drm/nv50-nvc0: switch to common disp impl, removing previous version

    Signed-off-by: Ben Skeggs <bskeggs-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

:040000 040000 9daeb0bd5ed3e9b22b53c21fab853bd2e392f6ed
4bdbb1d96e57d3f254affb8812788f04b7474bf7 M    drivers

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[Bug 67597] nouveau E Xorg failed to idle channel on NVA0

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https://bugs.freedesktop.org/show_bug.cgi?id=67597

--- Comment #8 from Marc Meledandri <m.meledandri-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Created attachment 83948
  --> https://bugs.freedesktop.org/attachment.cgi?id=83948&action=edit
git-bisect-log

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[Bug 67597] nouveau E Xorg failed to idle channel on NVA0

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https://bugs.freedesktop.org/show_bug.cgi?id=67597

Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://bugs.freedesktop.or
                   |                            |g/show_bug.cgi?id=67878

--- Comment #9 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
Same bisect result as https://bugs.freedesktop.org/show_bug.cgi?id=67878 . NV98
vs NVA0 -- fairly similar cards, too.

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[Bug 67597] nouveau E Xorg failed to idle channel on NVA0

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https://bugs.freedesktop.org/show_bug.cgi?id=67597

Martin Peres <martin.peres-GANU6spQydw@public.gmane.org> changed:

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

--- Comment #10 from Martin Peres <martin.peres-GANU6spQydw@public.gmane.org> ---
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