From owner-freebsd-stable@FreeBSD.ORG Wed Jan 13 16:05:44 2010 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 6073610656A6 for ; Wed, 13 Jan 2010 16:05:42 +0000 (UTC) (envelope-from jhb@freebsd.org) Received: from cyrus.watson.org (cyrus.watson.org [65.122.17.42]) by mx1.freebsd.org (Postfix) with ESMTP id 80D308FC14 for ; Wed, 13 Jan 2010 16:05:42 +0000 (UTC) Received: from bigwig.baldwin.cx (66.111.2.69.static.nyinternet.net [66.111.2.69]) by cyrus.watson.org (Postfix) with ESMTPSA id 3318346B5B; Wed, 13 Jan 2010 11:05:42 -0500 (EST) Received: from jhbbsd.localnet (smtp.hudson-trading.com [209.249.190.9]) by bigwig.baldwin.cx (Postfix) with ESMTPA id 418838A024; Wed, 13 Jan 2010 11:05:41 -0500 (EST) From: John Baldwin To: freebsd-stable@freebsd.org Date: Wed, 13 Jan 2010 09:53:33 -0500 User-Agent: KMail/1.12.1 (FreeBSD/7.2-CBSD-20091231; KDE/4.3.1; amd64; ; ) References: <4B4CEE78.4080708@rogers.com> In-Reply-To: MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <201001130953.33361.jhb@freebsd.org> X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.0.1 (bigwig.baldwin.cx); Wed, 13 Jan 2010 11:05:41 -0500 (EST) X-Virus-Scanned: clamav-milter 0.95.1 at bigwig.baldwin.cx X-Virus-Status: Clean X-Spam-Status: No, score=-2.6 required=4.2 tests=AWL,BAYES_00 autolearn=ham version=3.2.5 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on bigwig.baldwin.cx Cc: Gardner Bell , pluknet Subject: Re: LOR - 8.0-STABLE r202128 X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 Jan 2010 16:05:44 -0000 On Wednesday 13 January 2010 2:30:04 am pluknet wrote: > 2010/1/13 Gardner Bell : > > I got this lock order reversal while running a windows executable through > > wine. > > I'm guess that is a regression w.r.t S/G pager, which uses kmem_alloc/free > with vm_object locked and doesn't respect vm_map locks can sleep. > I'm curious it was back order before 5.1-R. It's more that it can call free() during the VM object's destructor. Hmm, presumably the call to sglist_free() needs to be deferred. Note that both the SG and device pagers free fake vm_page_t objects using uma_zfree() from their destructors. I guess uma_zfree() will never call kmem_free() directly? -- John Baldwin