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

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Message-ID: <20111205191116.GB4342@homer.localdomain>
Date:	Mon, 5 Dec 2011 14:11:16 -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 Mon, Dec 05, 2011 at 07:15:49PM +0100, Markus Trippelsdorf wrote:
> On 2011.12.05 at 12:10 -0500, Jerome Glisse wrote:
> > On Sun, Dec 04, 2011 at 02:02:00AM +0100, Markus Trippelsdorf 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.
> > > > >
> > > > 
> > > > 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...)
> > > 
> > 
> > Can you try if attached patch fix the issue when you don't pass the
> > radeon.no_wb=1 option ?
> 
> Yes the patch finally fixes the issue for me (tested with 120 kexec
> iterations).
> Thanks Jerome!
> 
> -- 
> Markus

Can you do a kick run on the modified patch ?

I believe this patch could go to stable too as it's low
impact from my pov.

Cheers,
Jerome

View attachment "0001-drm-radeon-disable-possible-GPU-writeback-early-v2.patch" of type "text/plain" (14650 bytes)