linux-kernel - Re: [BUG] 2.6.29-rc6-2450cf in scsi_lib.c (was: Large amount of scsi-sgpool)objects

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Date:	Wed, 4 Mar 2009 03:01:56 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
cc:	Jan Engelhardt <jengelh@...ozas.de>,
	Boaz Harrosh <bharrosh@...asas.com>,
	linux-scsi@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-ide <linux-ide@...r.kernel.org>
Subject: Re: [BUG] 2.6.29-rc6-2450cf in scsi_lib.c (was: Large amount of
 scsi-sgpool)objects

On Tue, 3 Mar 2009, James Bottomley wrote:

> On Tue, 2009-03-03 at 23:07 +0100, Thomas Gleixner wrote:
> > On Tue, 3 Mar 2009, Thomas Gleixner wrote:
> > > My bad. I was playing with that to get rid of the aic7xxx wreckage on
> > > one of my test boxen and forgot to remove it.
> > 
> > While the one below is definitey not my fault. It's on Linus latest:
> > 
> >  commit 2450cf51a1bdba7037e91b1bcc494b01c58aaf66
> > 
> > While compiling a kernel I triggerred the BUG below. Not so nice as it
> > took a whole filesystem with it. fsck took more than 20 min to recover
> > the leftovers :(
> > 
> > Thanks,
> > 
> > 	tglx
> > 
> > 
> > ------------[ cut here ]------------
> > kernel BUG at /home/tglx/work/kernel/git/linux-2.6/drivers/scsi/scsi_lib.c:1141!
> 
> This is BUG_ON(count > sdb->table.nents);
> 
> It looks like the sg list got split and grew in size ... I suspect this
> might be libata related, so cc'ing the ide list.  I suspect either the
> block layer initially parametrised this wrongly (tomo bug) or a sg list
> got split then requeued (something in libata?).

FYI, after I've lost a full day of work including the results of four
"iozone -a -g 4G" runs I tried to reproduce the problem on that
machine - the leftovers of the filesystem are pretty useless anyway.

It took about 2hrs to trigger the bug again. Same back trace.

Anything I can do what might help to decode the problem ?

Thanks,

	tglx
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