netdev - Re: WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413

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Message-ID: <CAH3drwaZDGSmA=iZzqKzo32QDcdYiUv5A+eM5x+MeKH3uxLt7g@mail.gmail.com>
Date:	Sun, 4 Dec 2011 12:32:00 -0500
From:	Jerome Glisse <j.glisse@...il.com>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc:	Dave Airlie <airlied@...il.com>, Christoph Lameter <cl@...ux.com>,
	"Alex, Shi" <alex.shi@...el.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.freedesktop.org, Pekka Enberg <penberg@...nel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Matt Mackall <mpm@...enic.com>, tj@...nel.org,
	Alex Deucher <alexander.deucher@....com>
Subject: Re: WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413

On Sat, Dec 3, 2011 at 8:02 PM, Markus Trippelsdorf
<markus@...ppelsdorf.de> wrote:
> On 2011.12.03 at 14:31 -0500, Jerome Glisse wrote:
>> On Sat, Dec 3, 2011 at 7:29 AM, Markus Trippelsdorf
>> <markus@...ppelsdorf.de> wrote:
>> > On 2011.12.03 at 12:20 +0000, Dave Airlie wrote:
>> >> >> > > > > FIX idr_layer_cache: Marking all objects used
>> >> >> > > >
>> >> >> > > > Yesterday I couldn't reproduce the issue at all. But today I've hit
>> >> >> > > > exactly the same spot again. (CCing the drm list)
>> >>
>> >> If I had to guess it looks like 0 is getting written back to some
>> >> random page by the GPU maybe, it could be that the GPU is in some half
>> >> setup state at boot or on a reboot does it happen from a cold boot or
>> >> just warm boot or kexec?
>> >
>> > Only happened with kexec thus far. Cold boot seems to be fine.
>> >
>> > --
>> > Markus
>>
>> Can you add radeon.no_wb=1 to your kexec kernel paramater an see if
>> you can reproduce.
>
> No, I cannot reproduce the issue with radeon.no_wb=1. (I write this
> after 700 successful kexec iterations...)
>

Ok so it's GPU writeback will do a patch on monday.

Cheers,
Jerome
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