From owner-freebsd-stable@FreeBSD.ORG Sat Oct 20 16:58:47 2007 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 DFA3616A41A; Sat, 20 Oct 2007 16:58:47 +0000 (UTC) (envelope-from oleg@vsi.ru) Received: from serv4.vsi.ru (serv4.vsi.ru [80.82.32.19]) by mx1.freebsd.org (Postfix) with ESMTP id 61AC113C468; Sat, 20 Oct 2007 16:58:45 +0000 (UTC) (envelope-from oleg@vsi.ru) Received: from W2KOOOD (ws3.oood.vsi.ru [88.83.197.238]) by serv4.vsi.ru (8.13.8+Sun/8.13.8) with SMTP id l9KGwS7Q022952; Sat, 20 Oct 2007 20:58:33 +0400 (MSD) Message-ID: <006d01c8133a$674a90b0$eec55358@W2KOOOD> From: "Oleg Derevenetz" To: "Alfred Perlstein" References: <027d01c8125c$73d4db80$c8c55358@delloleg> <20071019220501.GL31826@elvis.mu.org> Date: Sat, 20 Oct 2007 20:58:08 +0400 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1914 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1914 Cc: freebsd-stable@freebsd.org Subject: Re: kern/104406: [ufs] Processes get stuck in "ufs" state underpersistent CPU load 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: Sat, 20 Oct 2007 16:58:48 -0000 > > Can anyone take a look on PR kern/104406 ? I got repeatable hang situation, > > but I can't obtain a kernel dump to get result of all show commands from > > here: > > > > http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug-deadlocks.html > > > > After my break to debugger using Ctrl+Alt+Esc sequence and entering a > > "panic" command kernel does not wrote a kernel dump but seems to hang. Can > > anyone describe how to obtain a kernel dump in this situation, or at least > > say - which output of show commands need in first place to debug this ? > > Output of all suggested commands is huge and I afraid of making mistake > > when carrying this output from screen to list of paper and back :-) > > Oleg, one thing you can do to make this less painful is to > run your machine's console over serial port. > > First get a crossover serial cable, make sure it works from one > box to another, it should be easy to run "tip com1" on both > boxes to ensure that it works. > > Then you just need to add console=comconsole to /boot/loader.conf > and your box's console should come over serial. > > Then on the machine watching the console, you can just do this: > > % script > Script started, output file is typescript > % tip com1 > ...do ddb stuff now... > ...stop tip > % exit > > now you should have everything logged into a file called "typescript" > should save you a big headache. Thanks, I'll try it in the monday morning. > As far as getting a dump from ddb, try this: > > ddb> call doadump > > I'm completely at a loss why this isn't a base ddb command "dump" > but whatever... :) Unfortunately, this doesn't work too. I called duty personnel in this datacenter and asked them to do this, and person on duty tells me that after he enters this command something like that arrives on monitor: db> call doadump Dumping 3072 MB Dump aborted error I/O Dump failed. (Error 5) -- Oleg Derevenetz OOD3-RIPE Phone: +7 4732 539880 Fax: +7 4732 531415 http://www.vsi.ru CenterTelecom Voronezh ISP http://isp.vsi.ru