linux-kernel - Re: [PATCH] drm/nouveau/gem: tolerate a buffer specified multiple times

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Message-ID: <55BABB59.9080409@nexus-software.ie>
Date:	Fri, 31 Jul 2015 01:03:37 +0100
From:	Bryan O'Donoghue <pure.logic@...us-software.ie>
To:	Peter Hurley <peter@...leysoftware.com>,
	Timo Aaltonen <tjaalton@...ian.org>
CC:	Emil Velikov <emil.l.velikov@...il.com>,
	Ilia Mirkin <imirkin@...m.mit.edu>,
	Maarten Lankhorst <maarten.lankhorst@...onical.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	Ben Skeggs <bskeggs@...hat.com>
Subject: Re: [PATCH] drm/nouveau/gem: tolerate a buffer specified multiple
 times

On 30/07/15 22:45, Peter Hurley wrote:
> [ +cc Debian maintainer ]
>
> On 07/30/2015 11:26 AM, Emil Velikov wrote:
>> On 30 July 2015 at 16:02, Ilia Mirkin <imirkin@...m.mit.edu> wrote:
>>> On Thu, Jul 30, 2015 at 10:56 AM, Bryan O'Donoghue
>>> <pure.logic@...us-software.ie> wrote:
>>>> On 30/07/15 15:52, Bryan O'Donoghue wrote:
>>>>>
>>>>> On 30/07/15 15:49, Peter Hurley wrote:
>>>>>>
>>>>>> On 07/30/2015 10:12 AM, Ilia Mirkin wrote:
>>>>>>>
>>>>>>> Is this happening with libdrm 2.4.60? If so, that's a known
>>>>>>> (user-side) issue and should be fixed by using any version but that
>>>>>>> one.
>>>>>>
>>>>>>
>>>>>> What's the freedesktop bugzilla # for reference?
>>>>>>
>>>>>> Regards,
>>>>>> Peter Hurley
>>>>>
>>>>>
>>>>> I believe it's this one
>>>>>
>>>>> https://bugs.freedesktop.org/show_bug.cgi?id=89842#c19
>>>>>
>>>>
>>>> Not really a world of choice on ubuntu to fix it though...
>>>>
>>>> deckard@...eko:~/Development/projectara$ apt-show-versions libdrm2
>>>> libdrm2:amd64/trusty-updates 2.4.60-2~ubuntu14.04.1 uptodate
>>>> libdrm2:i386/trusty-updates 2.4.60-2~ubuntu14.04.1 uptodate
>>>>
>>>> :(
>>>
>>> That's unfortunate. I know next to nothing about debian/ubuntu or how
>>> they do versions or how to even build packages for them. But they're
>>> big distros, presumably they have support teams of some sort, perhaps
>>> they can help you.
>>>
>>> Assuming that switching away does resolve the issue for you, perhaps
>>> you can also recommend that they avoid shipping that version, or
>>> include this nouveau fix in it:
>>>
>>> http://cgit.freedesktop.org/mesa/drm/commit/?id=812e8fe6ce46d733c30207ee26c788c61f546294
>>>
>> Fwiw debian has been tracking this as #789759, and they are shipping
>> 2.4.62 which includes the fix.
>
> Unfortunately the LTS version of Ubuntu (trusty) was updated to 2.4.60
> several days ago without this fix.
>
> I repackaged libdrm 2.4.60 with only the bug fix above and confirm the
> patch above fixes the observed behavior in freedesktop bug# 89842/
> debian bug# 789759.
>
> I pushed the repackage to Launchpad PPA @ ppa:phurley/libdrm
>
> Hopefully the Debian maintainer grabs this fix and updates the official
> distribution version soon.
>
> Regards,
> Peter Hurley

Yep.

Dropping down to 2.4.56-1~ubuntu2 definitely removes the

nouveau E[chrome[2737]] multiple instances of buffer 33 on validation list
nouveau E[chrome[2737]] validate_init
nouveau E[chrome[2737]] validate: -22
nouveau E[chrome[2737]] multiple instances of buffer 18 on validation list
nouveau E[chrome[2737]] validate_init
  nouveau E[chrome[2737]] validate: -22
nouveau E[   PFIFO][0000:01:00.0] PFIFO: read fault at
0x0003e21000 [PAGE_NOT_PRESENT] from (unknown enum
0x00000000)/GPC0/(unknown enum 0x0000000f) on channel 0x007f80c000
[unknown]

and hard lock-up of X. I'll update these guys with the fix

http://tinyurl.com/orvbzf3
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