[Nouveau] Trouble on kernel

[Ilia Mirkin]

On Mon, Oct 28, 2013 at 3:45 AM, Martin Kaffanke <martin.kaffanke at gmx.at> wrote:
> Hi there,
>
> Sometimes my computer crashes since i use now ubuntu 13.10 with
> unity/compiz.

You're on NV4C. Do you have mesa 9.2.1 or later (or pre-9.2)? If you
have 9.2.0, there are known issues with shader compilation.

>
> dmesg tells me:
>
> [  686.209019] nouveau E[    PBUS][0000:00:0d.0] MMIO write of 0x00000000
> FAULT at 0x00b020

Odd. That's VPE. You should have one... maybe not. Nothing to worry
about though. (Especially odd that it's showing up multiple times --
are you trying to use xvmc?)

>
> and later:
>
> [ 1425.565441] nouveau E[  PGRAPH][0000:00:0d.0]  ERROR nsource: DATA_ERROR
> nstatus: BAD_ARGUMENT
> [ 1425.565462] nouveau E[  PGRAPH][0000:00:0d.0] ch 3 [0x00056000
> compiz[1970]] subc 2 class 0x0039 mthd 0x0314 data 0x031dc000

A bit more concerning:

$ lookup -a 4c -d NV01_SUBCHAN -- -v obj-class NV03_M2MF 0x0314 0x031dc000
PITCH_IN => 52281344

I'm sure that's above some limit. A pitch of 50MB... I wonder how
that's happening... If you feel like debugging, the place to look is
nv30_transfer.c (in mesa). Although I would think this would merely
cause misrendering, not crashes.

>
> So I don't really know where to start for debugging,
> if you could help me that would be great.
>
> Full dmesg output on http://ubuntuone.com/3AVhp6HT2jU26HdfguAbdV
>
> thanks,
> Martin
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