Nouveau - May 2015 - [Bug 90306] New: Nouveau crashes with multiple monitors

https://bugs.freedesktop.org/show_bug.cgi?id=90306

            Bug ID: 90306
           Summary: Nouveau crashes with multiple monitors
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: ofpoj.20.Toranaga-San at spamgourmet.com
        QA Contact: xorg-team at lists.x.org

Hello all,

I would like to direct your attention to this bug report from the arch linux
tracker:

https://bugs.archlinux.org/task/42121

Essentially the X server crashes when using nouveau with multiple monitors.
Whenever an xrandr command is issued the server crashes. This is particularly
irksome since this seems to send the monitors into power-saving mode (i.e. no
more signals are sent) so that the problem can't even be resolved from a
shell.

I am not the author of the bug report above, I merely googled the error

/usr/bin/Xorg.bin: symbol lookup error:
/usr/lib/xorg/modules/drivers/nouveau_drv.so: undefined symbol:
exaGetPixmapDriverPrivate

So this seems to affect multiple users. I am currently running debian jessie
using version 1.0.11 of xserver-xorg-video-nouveau and version 7.7+3~deb7u1 of
xorg-xserver but I ran into the same problem with arch a couple of weeks ago.

I would very much appreciate any help with this. This bug *really* breaks my
setup.

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ofpoj.20.Toranaga-San at spamgourmet.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|unspecified                 |7.7 (2012.06)

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https://bugs.freedesktop.org/show_bug.cgi?id=90306

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
in xorg/exa.h:

extern _X_EXPORT void *exaGetPixmapDriverPrivate(PixmapPtr p);

and in the actual server:

exa/exa.c:exaGetPixmapDriverPrivate(PixmapPtr pPix)

So... that seems odd. Please provide your xorg log, preferably which includes
that error. You can usually find a backed up log in /var/log/Xorg.0.log.old.

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--- Comment #2 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Oh, I bet you're using GLAMOR? Don't do that :) [Unless you have a
Maxwell, in
which case you're sunk.]

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--- Comment #3 from Lars Seipel <lars.seipel at gmail.com> ---
I'm seeing the same symptoms on my machine. For me, the issue gets triggered
by
a kernel update. 4.0 (with or without stable patches on top of that) works.
When running one of the 4.1 RCs the X server crashes on xrandr(1) (to enable
multi-monitor), printing the above symbol lookup error message to the console.

The attached log gives some hints as to why that might happen:
[    80.374] (EE) NOUVEAU(0): Failed to initialise context object: M2MF_NVC0
(0)
[    80.374] (EE) NOUVEAU(0): Error initialising acceleration.  Falling back to
NoAccel
[    80.374] (**) NOUVEAU(0): [COPY] acceleration disabled

So it's not necessarily that the original reporter is using GLAMOR, it might
also be the case that acceleration isn't enabled at all.

Any idea on what's causing this? I can try to pin down the earliest failing
commit but it'll take some time until I get to it.

Should I file a new report? OP doesn't state anything regarding kernel
version,
so the issues might or might not be related.

Versions used:
xorg-server 1.17.1
libdrm 2.4.61
xf86-video-nouveau 1.0.11
kernel v4.1-rc3-284-g92752b5 (i.e. Linus' current tree as of now)

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--- Comment #4 from Lars Seipel <lars.seipel at gmail.com> ---
Created attachment 115845
  --> https://bugs.freedesktop.org/attachment.cgi?id=115845&action=edit
Xorg.0.log

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--- Comment #5 from Lars Seipel <lars.seipel at gmail.com> ---
Created attachment 115846
  --> https://bugs.freedesktop.org/attachment.cgi?id=115846&action=edit
dmesg output

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--- Comment #6 from Lars Seipel <lars.seipel at gmail.com> ---
Turns out the issue was introduced with:

commit 3740c82590d87714b41b8b48bd3062178cbe0b17
Author: Ben Skeggs <bskeggs at redhat.com>
Date:   Thu Mar 26 09:18:32 2015 +1000

    drm/nouveau/gr/gf100-: add symbolic names for classes

    Signed-off-by: Ben Skeggs <bskeggs at redhat.com>

It seems that one of the added constants got hit by a typo. I sent
a patch to the list (CCed to Ben).

Now, that fixes things for me. The original report could still be an unrelated
problem.

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

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

--- Comment #7 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
closed from further activity.

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/185.

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