linux-kernel - Re: 2.6.21-git10/11: files getting truncated on xfs? or maybe an nlink problem?

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Message-ID: <20070510211348.GC86004887@sgi.com>
Date:	Fri, 11 May 2007 07:13:48 +1000
From:	David Chinner <dgc@....com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	David Chinner <dgc@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Matt Mackall <mpm@...enic.com>, xfs@....sgi.com,
	michal.k.k.piotrowski@...il.com
Subject: Re: 2.6.21-git10/11: files getting truncated on xfs? or maybe an nlink problem?

On Thu, May 10, 2007 at 07:46:33AM -0700, Jeremy Fitzhardinge wrote:
> David Chinner wrote:
> > On Wed, May 09, 2007 at 05:54:09PM -0700, Jeremy Fitzhardinge wrote:
> >   
> >> David Chinner wrote:
> >>     
> >>> Suspend-resume, eh?
> >>>
> >>> There's an immediate suspect. Can you test this specifically for us?
> >>> i.e. download a known good file set, do some stuff, suspend, resume,
> >>> then check the files? If it doesn't show up the first time, can
> >>> you do it a few times just to rule it out?
> >>>       
> >> Well, I've been doing suspend-resume with xfs for a while without
> >> problems; the problems seem to be recent and easily repeatable.  Which
> >> just means that it could be a new suspend-resume problem, of course.
> >>     
> >
> > Ok. I'm just trying to find a relatively simple test case for the
> > problem - seeing as you seem to be able to reliably reproduce this
> > we should be able to work out the trigger...
> >   
> 
> OK, I was able to reproduce it reliably with a script with did basically:
> 
>     for i in `seq 20`; do
>     	hg clone -U --pull a b-$i
>     	hg verify b-$i		# always OK
>     	umount /home
>     	sleep 5
>     	mount /home
>     	hg verify b-$i		# often found truncated files
>     done
>       
> 
> No suspend/resumes involved.  The trees are linux kernel ones, so fairly
> large, but small enough to fit entirely in core.  My script also
> captured xfs_bmap before/after output for files which had tended to be
> corrupted in the past, but unfortunately none of them got corrupted in
> these tests.  But I do have all the trees lying around to extract more
> detail for if you like.

Ok, so most of the of the integrity errors are processed by an
error like this:

drivers/scsi/sata_sil24.c index contains -98 extra bytes
unpacking file drivers/scsi/sata_sil24.c 5715cdfceaca: Error -5 while decompressing data

That's an -EIO and not a normal error to report. Are there any
errors in dmesg or syslog corresponding to this?

The errors tend to imply problems decompressing and patching files,
not that truncates are occurring once the files have been patched.
Can you check that what is being pulled from the repository is correct
before it gets uncompressed?

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group
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