Nouveau - Jul 2015 - [Bug 91233] New: The system hanged again

https://bugs.freedesktop.org/show_bug.cgi?id=91233

            Bug ID: 91233
           Summary: The system hanged again
           Product: xorg
           Version: unspecified
          Hardware: x86 (IA32)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: porton at narod.ru
        QA Contact: xorg-team at lists.x.org

There was this bug with Nouveau:
https://bugs.freedesktop.org/show_bug.cgi?id=89842

I believe this bug was fixed.

I have updated my Debian system to libdrm-nouveau2 2.4.62-1. After this the
crashes became much less frequent.

But today my Gnome session hanged again. Only mouse was moving. Keyboard and
mouse clicks became non-functional.

I pressed Alt+Ctrl+Backspace. After this I saw partially rendered buggy screen
of GDM.

I switched to a root console. There were the following errors: (Unfortunately,
I haven't recorded the very first error.)

[66411.140012] nouveau E[gnome-session-c[12401]] failed to idle channel
0xcccc0000 [gnome-session-c[12401]]
# service gpm [66400.124711] nouveau E[gnome-session-c[12401]] failed to idle
channel 0xcccc0000 [gnome-session-c[12401]]
start
[66403.128885] nouveau E[gnome-session-c[12401]] failed to idle channel
0xcccc0000 [gnome-session-c[12401]]
[66406.133056] nouveau E[gnome-session-c[12401]] failed to idle channel
0xcccc0000 [gnome-session-c[12401]]
[66408.135863] nouveau E[   PFIFO][0000:01:00.0] channel 6
[gnome-session-c[12401]] unload timeout
victor:~# [66414.144184] nouveau E[gnome-session-c[12401]] failed to idle
channel 0xcccc0000 [gnome-session-c[12401]]
[66417.148357] nouveau E[gnome-session-c[12401]] failed to idle channel
0xcccc0000 [gnome-session-c[12401]]

libdrm-nouveau2 2.4.62-1
Linux 3.10-2-amd64
X.Org X Server 1.17.1

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
You don't mention what hardware you have, but there have been *countless*
fixes
since linux 3.10 to almost all generations.

"failed to idle channel" means "hey, in case you haven't
noticed, your
application hung for some reason". Eventually it kills the application. The
other bug was overly generically named -- really it was about a very specific
error that occurred only with libdrm 2.4.60.

Please retest with linux 4.1.

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--- Comment #2 from Victor Porton <porton at narod.ru> ---
I've got a similar situation again.

The error was:

[171009.586992] nouveau E[     DRM] GPU lockup - switching to software fbcon

My hardware:
GeForce 8400 GS Rev. 3

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--- Comment #3 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Victor Porton from comment #2)
> I've got a similar situation again.
> 
> The error was:
> 
> [171009.586992] nouveau E[     DRM] GPU lockup - switching to software
fbcon
> 
> My hardware:
> GeForce 8400 GS Rev. 3
Did you use a fresh kernel? If so, which one?

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--- Comment #4 from Victor Porton <porton at narod.ru> ---
Apparently the bug was fixed and does not anymore appear for me.

$ uname -a
Linux victor.local 4.1.0-2-686-pae #1 SMP Debian 4.1.6-1 (2015-08-23) i686
GNU/Linux

libdrm-nouveau2 2.4.64-1
xserver-xorg-video-nouveau 1:1.0.11-1+b1

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |RESOLVED
         Resolution|---                         |FIXED

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