From owner-freebsd-current@FreeBSD.ORG Tue Jan 27 12:35:01 2009 Return-Path: Delivered-To: freebsd-current@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id D6F211065674 for ; Tue, 27 Jan 2009 12:35:01 +0000 (UTC) (envelope-from gavin@FreeBSD.org) Received: from mail-gw2.york.ac.uk (mail-gw2.york.ac.uk [144.32.128.247]) by mx1.freebsd.org (Postfix) with ESMTP id 4BD808FC17 for ; Tue, 27 Jan 2009 12:35:00 +0000 (UTC) (envelope-from gavin@FreeBSD.org) Received: from mail-gw6.york.ac.uk (mail-gw6.york.ac.uk [144.32.129.26]) by mail-gw2.york.ac.uk (8.13.6/8.13.6) with ESMTP id n0RCYPJR026787; Tue, 27 Jan 2009 12:34:25 GMT Received: from buffy-128.york.ac.uk ([144.32.128.160] helo=buffy.york.ac.uk) by mail-gw6.york.ac.uk with esmtps (TLSv1:AES256-SHA:256) (Exim 4.68) (envelope-from ) id 1LRn97-0002Ql-24; Tue, 27 Jan 2009 12:34:25 +0000 Received: from buffy.york.ac.uk (localhost [127.0.0.1]) by buffy.york.ac.uk (8.14.2/8.14.2) with ESMTP id n0RCYOdQ026500; Tue, 27 Jan 2009 12:34:24 GMT (envelope-from gavin@FreeBSD.org) Received: (from ga9@localhost) by buffy.york.ac.uk (8.14.2/8.14.2/Submit) id n0RCYOPP026466; Tue, 27 Jan 2009 12:34:24 GMT (envelope-from gavin@FreeBSD.org) X-Authentication-Warning: buffy.york.ac.uk: ga9 set sender to gavin@FreeBSD.org using -f From: Gavin Atkinson To: Paul Tice In-Reply-To: References: <1232712477.89022.7.camel@buffy.york.ac.uk> <1232713174.89022.8.camel@buffy.york.ac.uk> Content-Type: text/plain Content-Transfer-Encoding: 7bit Date: Tue, 27 Jan 2009 12:34:23 +0000 Message-Id: <1233059663.71657.6.camel@buffy.york.ac.uk> Mime-Version: 1.0 X-Mailer: Evolution 2.22.2 FreeBSD GNOME Team Port X-York-MailScanner: Found to be clean X-York-MailScanner-From: gavin@freebsd.org Cc: freebsd-current@FreeBSD.org Subject: RE: UFS/VFS lock order reversal on stock 8.0-200812-AMD64 X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Jan 2009 12:35:05 -0000 On Fri, 2009-01-23 at 12:28 -0600, Paul Tice wrote: > -----Original Message----- > From: Gavin Atkinson [mailto:gavin@FreeBSD.org] > Sent: Fri 1/23/2009 6:19 AM > To: Paul Tice > Cc: freebsd-current@FreeBSD.org > Subject: Re: UFS/VFS lock order reversal on stock 8.0-200812-AMD64 > > On Fri, 2009-01-23 at 12:07 +0000, Gavin Atkinson wrote: > > On Thu, 2009-01-22 at 21:33 -0600, Paul Tice wrote: > > > I'm new, so please advise me (gently?) about list protocol and such if needed. > > > > > > Using stock 8.0-CURRENT-200812-amd64, I am getting the messages below. > > > > 8.0-CURRENT is essentially the bleeding-edge of FreeBSD, and is where > > development happens that has not necessarily proven itself as being > > stable. As it is the development branch, it also has a lot of extra > > debugging enabled, which is what you are seeing with the "lock order > > reversals". > > > > If you are not running 8-CURRENT for a specific reason (e.g. because you > > are doing FreeBSD OS development work, or you are prepared to help debug > > issues as you encounter them, or similar), you probably shouldn't be > > running CURRENT. Stick with 7.1. > > >I should have also included (in answer to your actual question): > >Neither the lock order reversals or the corrupted messages on shutdown > >are anything you need worry about. > > >Gavin > > > I wouldn't have asked if I wasn't willing to help debug (as possible, and with very little coding knowledge.) Cool. It's always good to have more people using and testing -CURRENT, I just wanted to make sure you knew what you were getting yourself in for :) > I pulled out the 'extra debugging', made world and kernel, and rebooted. > Notice the 5th line of da7's drive ID being interleaved with 'SMP: AP CPU #1 Launched!' > > I'm fairly sure this is not a good thing, if for no other reason that 'apparent garbage' in dmesg is not useful. It's not a good thing, but it's a known issue and is purely cosmetic. Gavin