From owner-freebsd-current@FreeBSD.ORG Sat Jul 3 07:40:09 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 92DE816A4CE for ; Sat, 3 Jul 2004 07:40:09 +0000 (GMT) Received: from smtp002.bizmail.yahoo.com (smtp002.bizmail.yahoo.com [216.136.172.126]) by mx1.FreeBSD.org (Postfix) with SMTP id 63B7843D5C for ; Sat, 3 Jul 2004 07:40:09 +0000 (GMT) (envelope-from noackjr@alumni.rice.edu) Received: from unknown (HELO optimator.noacks.org) (noackjr@supercrime.org@70.240.179.20 with login) by smtp002.bizmail.yahoo.com with SMTP; 3 Jul 2004 07:40:08 -0000 Received: from localhost (localhost [127.0.0.1]) by optimator.noacks.org (Postfix) with ESMTP id 4CFBB6186; Sat, 3 Jul 2004 02:40:07 -0500 (CDT) Received: from optimator.noacks.org ([127.0.0.1]) by localhost (optimator.noacks.org [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 16366-07-3; Sat, 3 Jul 2004 02:40:05 -0500 (CDT) Received: from compgeek.noacks.org (compgeek [192.168.1.10]) by optimator.noacks.org (Postfix) with ESMTP id CF65F6171; Sat, 3 Jul 2004 02:40:05 -0500 (CDT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by compgeek.noacks.org (8.12.11/8.12.11) with ESMTP id i637e5dh051798; Sat, 3 Jul 2004 02:40:05 -0500 (CDT) (envelope-from noackjr@alumni.rice.edu) Message-ID: <40E662D5.8070009@alumni.rice.edu> Date: Sat, 03 Jul 2004 02:40:05 -0500 From: Jon Noack User-Agent: Mozilla Thunderbird 0.7.1 (X11/20040629) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Nate Lawson References: <20040703000302.T58868@root.org> In-Reply-To: <20040703000302.T58868@root.org> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at noacks.org cc: current@freebsd.org Subject: Re: LoR in slab allocator and swapper X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: noackjr@alumni.rice.edu List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 03 Jul 2004 07:40:09 -0000 On 07/03/04 02:04, Nate Lawson wrote: > Just in case no one has reported this one: > > [...] > lock order reversal > 1st 0xc1a31108 vm object (vm object) @ /usr/src/sys/vm/swap_pager.c:1313 > 2nd 0xc08c6300 swap_pager swhash (swap_pager swhash) @ /usr/src/sys/vm/swap_pager.c:1799 > 3rd 0xc103fce4 vm object (vm object) @ /usr/src/sys/vm/uma_core.c:923 Yeah, it's been reported a few dozen times. It's a false positive and is harmless. See #1 on the LOR status page: http://sources.zabbadoz.net/freebsd/lor.html We're working on getting a new FAQ entry for LORs (http://www.freebsd.org/cgi/query-pr.cgi?pr=68595) which will have a pointer to the LOR status page given above. Once this is done, the idea is to update the lock order reversal message to point to this FAQ entry so we can better educate users on LORs and eliminate people reporting the same LOR tons of times. Jon