linux-kernel - Re: [PATCH] scsi: fix sense

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Message-ID: <Pine.LNX.4.64.0804071844350.14273@blonde.site>
Date:	Mon, 7 Apr 2008 18:51:08 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Jens Axboe <jens.axboe@...cle.com>,
	Christoph Lameter <clameter@....com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: fix sense_slab/bio swapping livelock

On Mon, 7 Apr 2008, Hugh Dickins wrote:
> On Sun, 6 Apr 2008, James Bottomley wrote:
> > 
> > This was sort of accidentally fixed in scsi-misc by commit 
> > 
> > commit c5f73260b289cb974928eac05f2d84e58ddfc020
> > Author: James Bottomley <James.Bottomley@...senPartnership.com>
> > Date:   Thu Mar 13 11:16:33 2008 -0500
> > 
> >     [SCSI] consolidate command allocation in a single place
> 
> Thanks, yes, that looks a good substitute to me.
> 
> > Could you check that:
> > 
> > master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6.git
> > 
> > and see if it alleviates the problem? ... if so, we can work out which
> > pieces to backport.
> 
> Precisely that patch seems appropriate to 2.6.25-rc8-git, so I'm now
> running the test with just that applied to 2.6.25-rc8 (plus cfq rcu
> fix).  Not quite what you asked, but...
> 
> Strictly speaking, it'd take a couple of days to be reasonably sure
> that the livelock is gone (it appeared to reproduce quicker once I
> moved to -rc8 plus cfq rcu fix; but I'm not entirely convinced that
> wasn't just coincidence).  But if nothing bad appears overnight,
> let's assume your patch is the one to push: I'll report tomorrow.

Right, as expected, that seems to run fine: I've seen no problem with
it in 17 hours - beyond, of course, all the page allocation failures
which will plague such tests until something else is changed.

Somewhat irrelevant since Linus put my patch into 2.6.25-rc8-git
(probably worth it for the various issues noted in the comment);
but reassuring for 2.6.26.

I'll stop that test now and put it to work on something else.

Hugh
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