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

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Message-Id: <201006292104.33778.chris2553@googlemail.com>
Date:	Tue, 29 Jun 2010 21:04:33 +0100
From:	Chris Clayton <chris2553@...glemail.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Nick Piggin <npiggin@...e.de>,
	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>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [patch 02/52] fs: fix superblock iteration race

On Tuesday 29 June 2010, 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).
>

Well, it was repeatable this morning, but despite 30+ shutdowns this evening, I 
haven't had a single oops. Perhaps I'm just not doing enough computing stuff 
between startup and shutdown to create the conditions under which I got the 
oopses this morning. Moreover, I've been using this kernel every day with, 
maybe two or three shutdowns a day, for two weeks or so now (since just after 
Linus went on vacation) with no oopses. (The kernel is -rc3 + John 
Fastabend's "net: fix deliver_no_wcard regression on loopback device" patch).

I'll spend a couple of hours doing stuff and see if I can generate an oops. 
Trouble is, of course, that when I pull and build the latest and greatest, I 
won't know why I'm not getting oopses, assuming I don't.

I'll update y'all later.

Chris

>                          Linus

-- 
The more I see, the more I know. The more I know, the less I understand. 
Changing Man - Paul Weller
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