From owner-freebsd-stable@FreeBSD.ORG Sat Oct 20 08:45:19 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 A50C616A46B for ; Sat, 20 Oct 2007 08:45:19 +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 2C8DA13C44B for ; Sat, 20 Oct 2007 08:45:17 +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 l9K8j5tJ004134; Sat, 20 Oct 2007 12:45:10 +0400 (MSD) Message-ID: <008d01c812f5$7aad62d0$eec55358@W2KOOOD> From: "Oleg Derevenetz" To: "Eugene Grosbein" References: <027d01c8125c$73d4db80$c8c55358@delloleg><20071019220501.GL31826@elvis.mu.org> <20071020082724.GA87825@svzserv.kemerovo.su> Date: Sat, 20 Oct 2007 12:44:46 +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 08:45:19 -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 :-) > > This very easy to reproduce [ufs] uninterruptable deadlock > for both of RELENG_6 and RELENG_7. Look at this PR: > http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/107439 > > The PR is closed but the problem is still here with 7.0-PRERELEASE > and, perhaps, CURRENT. This is probably another bug because: 1. I built kernel with INVARIANTS as described in on "Debugging Deadlocks" page of FreeBSD Developers' Handbook and got no panic, but only deadlock; 2. I have no NTFS filesystem at all and just do a copy of file(s) from FTP to local UFS using mc. In this PR panic occured when NTFS mounted r/w (and NOT occured when the same NTFS mounted r/o). -- Oleg Derevenetz OOD3-RIPE Phone: +7 4732 539880 Fax: +7 4732 531415 http://www.vsi.ru CenterTelecom Voronezh ISP http://isp.vsi.ru