linux-kernel - Re: Lockdep splat in autofs with 2.6.39-rc2

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Message-ID: <20110427132219.GA2843@elliptictech.com>
Date:	Wed, 27 Apr 2011 09:22:19 -0400
From:	Nick Bowler <nbowler@...iptictech.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, autofs@...ux.kernel.org,
	Ian Kent <raven@...maw.net>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: Lockdep splat in autofs with 2.6.39-rc2

On 2011-04-21 17:25 -0400, Steven Rostedt wrote:
> On Thu, Apr 07, 2011 at 03:44:03PM -0400, Nick Bowler wrote:
> > Just saw this on 2.6.39-rc2 after half a day or so of uptime.  I've
> > never seen it before today so it may be a regression from 2.6.38.
> > Nothing seems have failed as a result.  Please let me know if you
> > need any more info.
> 
> Could you try this patch. I know it may be hard to reproduce, but the
> issue is that we are recursing down the locks in a tree/list and we changed a
> lock from being nested to being a parent. This patch tells lockdep about
> what we did.

OK, I've built 2.6.39-rc5 with this patch applied.  However, it took ~5
days before I saw any splat with -rc4, thus it's unlikely that I'll be
able to say for sure that it works.

-- 
Nick Bowler, Elliptic Technologies (http://www.elliptictech.com/)
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