linux-kernel - Re: [patch 02/52] fs: fix superblock iteration race

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Message-ID: <20100630125100.GG31073@ZenIV.linux.org.uk>
Date:	Wed, 30 Jun 2010 13:51:00 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Nick Piggin <npiggin@...e.de>,
	Chris Clayton <chris2553@...glemail.com>,
	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	John Stultz <johnstul@...ibm.com>,
	Frank Mayhar <fmayhar@...gle.com>
Subject: Re: [patch 02/52] fs: fix superblock iteration race

On Tue, Jun 29, 2010 at 10:58:14AM -0700, Linus Torvalds wrote:
> On Tue, Jun 29, 2010 at 10:52 AM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
> >
> > Look for "2.6.35-rc3 oops trying to suspend" on lkml, for example. No
> > guarantee that it's the same thing, but it's "iterate_supers()"
> > getting an oops [..]
> 
> Also, "Oops during closedown with 2.6.35-rc3-git3" is an
> iterate_supers oops (in the jpg) and Chris says it's repeatable for
> him.
> 
> Chris - you could try testing current -git now that I've merged Nick's
> patch. It's commit 57439f878af ("fs: fix superblock iteration race"),
> and I just pushed it out (so it might take a few minutes to mirror out
> to the public git trees, but it should be there shortly).

ACK.  I've several cleanups on top of that, but that's not a .35 fodder.
I'll put them into for-next tonight.  But yes, the hole caught by
Nick is definitely real and very likely to be responsible for all that
pile of reports.  Mea culpa.
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