linux-kernel - Re: possible regression on 3.13 when calling flush_dcache

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Date:	Tue, 24 Dec 2013 15:38:37 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linux-mmc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: possible regression on 3.13 when calling flush_dcache_page

On Mon, Dec 23, 2013 at 11:44:35PM +0100, Ludovic Desroches wrote:
> On Fri, Dec 20, 2013 at 09:08:51AM +0100, Ludovic Desroches wrote:
> > Hello,
> > 
> > On Wed, Dec 18, 2013 at 04:21:17PM +0900, Joonsoo Kim wrote:
> > > On Mon, Dec 16, 2013 at 03:43:43PM +0100, Ludovic Desroches wrote:
> > > > Hello,
> > > > 
> > > > On Fri, Dec 13, 2013 at 10:59:09AM +0900, Joonsoo Kim wrote:
> > > > > On Thu, Dec 12, 2013 at 03:36:19PM +0100, Ludovic Desroches wrote:
> > > > > > fix mmc mailing list address error
> > > > > > 
> > > > > > On Thu, Dec 12, 2013 at 03:31:50PM +0100, Ludovic Desroches wrote:
> > > > > > > Hi,
> > > > > > > 
> > > > > > > With v3.13-rc3 I have an error when the atmel-mci driver calls
> > > > > > > flush_dcache_page (log at the end of the message).
> > > > > > > 
> > > > > > > Since I didn't have it before, I did a git bisect and the commit introducing
> > > > > > > the error is the following one:
> > > > > > > 
> > > > > > > 106a74e slab: replace free and inuse in struct slab with newly introduced active
> > > > > > > 
> > > > > > > I don't know if this commit has introduced a bug or if it has revealed a bug
> > > > > > > in the atmel-mci driver.
> > > > > 
> > > > > Hello,
> > > > > 
> > > > > I think that this commit may not introduce a bug. This patch remove one
> > > > > variable on slab management structure and replace variable name. So there
> > > > > is no functional change.
> > > > > 
> > > > 
> > > > If I have reverted this patch and other ones you did on top of it and
> > > > the issue disappear.
> > > 
> > > Hello,
> > > 
> > > Could you give me your '/proc/slabinfo' before/after this commit (106a74e)?
> > > 
> > > And how about testing with artificially increasing size of struct slab on
> > > top of this commit (106a74e)?
> > > 
> > > I really wonder why the problem happens, because this doesn't cause any
> > > functional change as far as I know. Only side-effect from this patch is
> > > decreasing size of struct slab.
> > 
> > Sorry I am not at the office, I have tried to reproduce it with a
> > different device and a different sdcard but without success. I'll test
> > it on Monday.
> 
> I am still not at the office but I get the same device and the same
> sdcard and I don't reproduce it. I am not totally in the same
> conditions. It seems there is an extra parameter causing this bug but I
> don't figure out which one at the moment.

Okay. I will wait for you!

Thanks for informing progress.
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