From owner-freebsd-stable@FreeBSD.ORG  Tue Sep 23 21:18:19 2008
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
Delivered-To: stable@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id D49CD1065674
	for <stable@FreeBSD.org>; Tue, 23 Sep 2008 21:18:19 +0000 (UTC)
	(envelope-from rwatson@FreeBSD.org)
Received: from cyrus.watson.org (cyrus.watson.org [65.122.17.42])
	by mx1.freebsd.org (Postfix) with ESMTP id AAEF58FC17
	for <stable@FreeBSD.org>; Tue, 23 Sep 2008 21:18:19 +0000 (UTC)
	(envelope-from rwatson@FreeBSD.org)
Received: from fledge.watson.org (fledge.watson.org [65.122.17.41])
	by cyrus.watson.org (Postfix) with ESMTP id 4439146B46;
	Tue, 23 Sep 2008 17:18:19 -0400 (EDT)
Date: Tue, 23 Sep 2008 22:18:19 +0100 (BST)
From: Robert Watson <rwatson@FreeBSD.org>
X-X-Sender: robert@fledge.watson.org
To: Mikhail Teterin <mi+mill@aldan.algebra.com>
In-Reply-To: <48D955EE.3090108@aldan.algebra.com>
Message-ID: <alpine.BSF.1.10.0809232217081.68287@fledge.watson.org>
References: <48D92589.8000200@aldan.algebra.com>
	<alpine.BSF.1.10.0809232136130.68287@fledge.watson.org>
	<48D955EE.3090108@aldan.algebra.com>
User-Agent: Alpine 1.10 (BSF 962 2008-03-14)
MIME-Version: 1.0
Content-Type: MULTIPART/MIXED;
	BOUNDARY="621616949-1052563692-1222204699=:68287"
Cc: stable@FreeBSD.org
Subject: Re: 7.0-stable: a hung process - scheduler bug?
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>, 
	<mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 23 Sep 2008 21:18:19 -0000

  This message is in MIME format.  The first part should be readable text,
  while the remaining parts are likely unreadable without MIME-aware tools.

--621616949-1052563692-1222204699=:68287
Content-Type: TEXT/PLAIN; charset=KOI8-U; format=flowed
Content-Transfer-Encoding: 8BIT

On Tue, 23 Sep 2008, Mikhail Teterin wrote:

> Robert Watson ΞΑΠΙΣΑΧ(ΜΑ):
>> Could you try procstat -kk on the process, does that shed any light?
> When I was trying `procstat -k', I was getting the message:
>
>     PID    TID COMM             TDNAME             KSTACK 
> procstat: sysctl: kern.proc.kstack unavailable
>   procstat: options DDB or options STACK required in kernel
>
> That was with a single `-k'. I can't do anything now, because -- after an 
> attempt to start `systat 1 -vm' -- the system hosed and would not start new 
> processes. The existing ones, such as the cvs-over ssh are stuck in:
>
>   load: 0.00 cmd: ssh 59098 [proctree] 0.41u 0.17s 0% 0k

Sounds a lot like a lock leak/deadlock.  Other than DDB output or a crashdump, 
which would allow us to explore some more, there's probably not much to be 
done with the box at this point other than reset.  Sorry about that.

Robert N M Watson
Computer Laboratory
University of Cambridge
--621616949-1052563692-1222204699=:68287--