From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nick Bowler Subject: Re: Lockdep splat in autofs with 2.6.39-rc2 Date: Wed, 27 Apr 2011 09:22:19 -0400 Message-ID: <20110427132219.GA2843@elliptictech.com> References: <20110407194403.GA29404@elliptictech.com> <20110421212537.GC24898@home.goodmis.org> Mime-Version: 1.0 Return-path: Content-Disposition: inline In-Reply-To: <20110421212537.GC24898@home.goodmis.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Steven Rostedt Cc: linux-kernel@vger.kernel.org, autofs@linux.kernel.org, Ian Kent , Peter Zijlstra 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/)