From owner-freebsd-hackers@FreeBSD.ORG Thu Sep 16 12:38:02 2010 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id A128210656A5 for ; Thu, 16 Sep 2010 12:38:02 +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 72E6F8FC19 for ; Thu, 16 Sep 2010 12:38:02 +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 0B43B46B5C; Thu, 16 Sep 2010 08:38:02 -0400 (EDT) Received: from jhbbsd.localnet (smtp.hudson-trading.com [209.249.190.9]) by bigwig.baldwin.cx (Postfix) with ESMTPSA id 323D38A03C; Thu, 16 Sep 2010 08:38:01 -0400 (EDT) From: John Baldwin To: freebsd-hackers@freebsd.org Date: Thu, 16 Sep 2010 08:15:18 -0400 User-Agent: KMail/1.13.5 (FreeBSD/7.3-CBSD-20100819; KDE/4.4.5; amd64; ; ) References: <4C915E4F.9030006@adaranet.com> In-Reply-To: <4C915E4F.9030006@adaranet.com> MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Message-Id: <201009160815.18679.jhb@freebsd.org> X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.0.1 (bigwig.baldwin.cx); Thu, 16 Sep 2010 08:38:01 -0400 (EDT) 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: Patrick Mahan Subject: Re: odd issues with DDB vs GDB X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 16 Sep 2010 12:38:02 -0000 On Wednesday, September 15, 2010 8:01:19 pm Patrick Mahan wrote: > All, > > I am trying to debug a system hang occurring on my HP Proliant G6 running some of our > kernel software. I am seeing that under certain test loads, the system will hang-up > complete, no keyboard, no console, etc. I suspect it is some of the kernel code that > I have inherited that contains a lot of locking (lots of data structure, each having > their own mutex lock (sleepable)). You need to use 'kgdb' rather than 'gdb' on kernel.debug. -- John Baldwin