From owner-freebsd-current@FreeBSD.ORG Sun Oct 9 00:31:16 2011 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 AB80E106566B for ; Sun, 9 Oct 2011 00:31:16 +0000 (UTC) (envelope-from kaduk@mit.edu) Received: from dmz-mailsec-scanner-3.mit.edu (DMZ-MAILSEC-SCANNER-3.MIT.EDU [18.9.25.14]) by mx1.freebsd.org (Postfix) with ESMTP id 4ACD98FC08 for ; Sun, 9 Oct 2011 00:31:15 +0000 (UTC) X-AuditID: 1209190e-b7f4a6d0000008e5-02-4e90eb5330ad Received: from mailhub-auth-4.mit.edu ( [18.7.62.39]) by dmz-mailsec-scanner-3.mit.edu (Symantec Messaging Gateway) with SMTP id A9.99.02277.35BE09E4; Sat, 8 Oct 2011 20:31:15 -0400 (EDT) Received: from outgoing.mit.edu (OUTGOING-AUTH.MIT.EDU [18.7.22.103]) by mailhub-auth-4.mit.edu (8.13.8/8.9.2) with ESMTP id p990VFIJ018783; Sat, 8 Oct 2011 20:31:15 -0400 Received: from multics.mit.edu (MULTICS.MIT.EDU [18.187.1.73]) (authenticated bits=56) (User authenticated as kaduk@ATHENA.MIT.EDU) by outgoing.mit.edu (8.13.6/8.12.4) with ESMTP id p990VCZL028308 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Sat, 8 Oct 2011 20:31:15 -0400 (EDT) Received: (from kaduk@localhost) by multics.mit.edu (8.12.9.20060308) id p990VCTc016429; Sat, 8 Oct 2011 20:31:12 -0400 (EDT) Date: Sat, 8 Oct 2011 20:31:12 -0400 (EDT) From: Benjamin Kaduk To: Roar Pettersen In-Reply-To: Message-ID: References: User-Agent: Alpine 1.10 (GSO 962 2008-03-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrNIsWRmVeSWpSXmKPExsUixG6nrhv8eoKfwZtLChZz3nxgsri+z8yB yWPGp/ksHjtn3WUPYIrisklJzcksSy3St0vgypjw5BtLwVfWiq8HXjI1MN5h6WLk5JAQMJF4 9GYRI4QtJnHh3nq2LkYuDiGBfYwSB2cdY4Jw1jNKbHk0mx3C2c8kcf3TeyaQFiGBeonnhy4z g9gsAloSTfcWg41iE1CRmPlmIxuILSKgLtH9ZDoriM0sIC/x/8plsF5hAW2JCy+XgfVyCgRK bD7xA8jm4OAVsJdYuCsLYnyAxI1py8BaRQV0JFbvnwJ2Na+AoMTJmU9YIEZaSpz7c51tAqPg LCSpWUhSCxiZVjHKpuRW6eYmZuYUpybrFicn5uWlFuka6+VmluilppRuYgSFKack3w7GrweV DjEKcDAq8fBufDHBT4g1say4MvcQoyQHk5Iob9xLoBBfUn5KZUZicUZ8UWlOavEhRgkOZiUR 3pbtQDnelMTKqtSifJiUNAeLkjjv6h0OfkIC6YklqdmpqQWpRTBZGQ4OJQnejldAjYJFqemp FWmZOSUIaSYOTpDhPEDDu0BqeIsLEnOLM9Mh8qcYFaXEeeeDJARAEhmleXC9sDTyilEc6BVh 3iaQKh5gCoLrfgU0mAlo8GnjfpDBJYkIKakGRo6GI2l71JPkZqQEuB0Iftk36+fMLX/12Xy+ bF/1+crKcwqbZd92SlVtWyjPOXtr/Ptb7/7Nvzkp/ZeV9xPLm+6p+jk3dz/L8f+SwaNzTVa+ 4p/XmdvP34T8TV42rV7wgFFz5QXvpdfmuSyw7f9lotzWo5kl//KYuqMpq6VuntP9sy3b3zeG 31diKc5INNRiLipOBAAOhlny/gIAAA== Cc: freebsd-current@freebsd.org Subject: Re: 9.0-BETA 3 lock order reversal 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: Sun, 09 Oct 2011 00:31:16 -0000 On Sat, 8 Oct 2011, Roar Pettersen wrote: > Hello ! > > > Just did a new build of world & kernel, and the error message have changed a > bit : > > > lock order reversal: > 1st 0xddf0c4cc bufwait (bufwait) @ /usr/src/sys/kern/vfs_bio.c:2658 > 2nd 0xc4996200 dirhash (dirhash) @ /usr/src/sys/ufs/ufs/ufs_dirhash.c:284 Hi Roar, Both of these look to be "well-known" (i.e. trivially reproduced) LORs. No one seems to have been willing to step up to disable the warnings for them or otherwise eliminate them, though, so they still pop up and surprise people. Thanks for taking the time to report them, and sorry that they've been sitting untouched for so long. -Ben Kaduk [0] http://ipv4.sources.zabbadoz.net/freebsd/lor.html