From owner-freebsd-net@FreeBSD.ORG Fri Jan 14 19:38:31 2011 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 4A0F1106567A for ; Fri, 14 Jan 2011 19:38:31 +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 1B2218FC14 for ; Fri, 14 Jan 2011 19:38:31 +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 B051846B03; Fri, 14 Jan 2011 14:38:30 -0500 (EST) Received: from jhbbsd.localnet (smtp.hudson-trading.com [209.249.190.9]) by bigwig.baldwin.cx (Postfix) with ESMTPSA id C93728A009; Fri, 14 Jan 2011 14:38:29 -0500 (EST) From: John Baldwin To: freebsd-net@freebsd.org Date: Fri, 14 Jan 2011 14:37:55 -0500 User-Agent: KMail/1.13.5 (FreeBSD/7.4-CBSD-20110107; KDE/4.4.5; amd64; ; ) References: <4D3011DB.9050900@frasunek.com> <4D30458D.30007@sentex.net> <4D309983.70709@rdtc.ru> In-Reply-To: <4D309983.70709@rdtc.ru> MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <201101141437.55421.jhb@freebsd.org> X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.2.6 (bigwig.baldwin.cx); Fri, 14 Jan 2011 14:38:29 -0500 (EST) X-Virus-Scanned: clamav-milter 0.96.3 at bigwig.baldwin.cx X-Virus-Status: Clean X-Spam-Status: No, score=-1.9 required=4.2 tests=BAYES_00 autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on bigwig.baldwin.cx Cc: Przemyslaw Frasunek , Eugene Grosbein , Mike Tancsa Subject: Re: panic: bufwrite: buffer is not busy??? X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 Jan 2011 19:38:31 -0000 On Friday, January 14, 2011 1:44:19 pm Eugene Grosbein wrote: > On 14.01.2011 18:46, Mike Tancsa wrote: > > >> I'm using mpd 5.5 on three PPPoE routers, each servicing about 300 PPPoE > >> concurrent sessions. Routers are based on Intel SR1630GP hardware platforms and > >> runs FreeBSD 7.3-RELEASE. > >> > >> I'm experiencing stability issues related to Netgraph. None of above routers can > >> survive more than 20-30 days of uptime under typical load. There are different > >> flavors of kernel panics, but all are somehow related to netgraph. Typical > >> backtraces follow > > > > I also have stability issues on RELENG_8. > > > > http://www.freebsd.org/cgi/query-pr.cgi?pr=153497 > > And for one of my servers (8.2-PRERELEASE/amd64 with 4GB RAM) I just cannot obtain crashdump, > it cannot finish to write it. For example, it happened an hour ago: > > Fatal trap 12: page fault while in kernel mode > cpuid = 2; apic id = 04 > fault virtual address = 0x200000040 > fault code = supervisor read data, page not present > instruction pointer = 0x20:0xffffffff803cc979 Assuming your kernel is built with debug symbols (which is the default), one thing you can do to aid in debugging is this: gdb /boot/kernel/kernel (gdb) l *0xffffffff803cc979 Where the 0xfff bit is the part of the 'instruction pointer' value above after the colon (:) and then send the output of that in your e-mail to the list. This allows us to the source line at which the fault occurred. -- John Baldwin