From owner-freebsd-current@FreeBSD.ORG Sun Feb 15 23:07:21 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 9C16316A4CE; Sun, 15 Feb 2004 23:07:21 -0800 (PST) Received: from srv1.cosmo-project.de (srv1.cosmo-project.de [213.83.6.106]) by mx1.FreeBSD.org (Postfix) with ESMTP id E7A2843D1D; Sun, 15 Feb 2004 23:07:20 -0800 (PST) (envelope-from ticso@cicely12.cicely.de) Received: from cicely5.cicely.de (cicely5.cicely.de [IPv6:3ffe:400:8d0:301:200:92ff:fe9b:20e7]) (authenticated bits=0) i1G77CrQ012465 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=OK); Mon, 16 Feb 2004 08:07:18 +0100 (CET) (envelope-from ticso@cicely12.cicely.de) Received: from cicely12.cicely.de (cicely12.cicely.de [IPv6:3ffe:400:8d0:301::12]) by cicely5.cicely.de (8.12.10/8.12.10) with ESMTP id i1G771uL002635 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Mon, 16 Feb 2004 08:07:02 +0100 (CET) (envelope-from ticso@cicely12.cicely.de) Received: from cicely12.cicely.de (localhost [127.0.0.1]) by cicely12.cicely.de (8.12.10/8.12.10) with ESMTP id i1G771c5051190; Mon, 16 Feb 2004 08:07:01 +0100 (CET) (envelope-from ticso@cicely12.cicely.de) Received: (from ticso@localhost) by cicely12.cicely.de (8.12.10/8.12.10/Submit) id i1G770E4051189; Mon, 16 Feb 2004 08:07:00 +0100 (CET) (envelope-from ticso) Date: Mon, 16 Feb 2004 08:07:00 +0100 From: Bernd Walter To: Kris Kennaway Message-ID: <20040216070659.GA44313@cicely12.cicely.de> References: <20040216055840.GA72555@xor.obsecurity.org> <20040216061821.GZ44313@cicely12.cicely.de> <20040216063651.GA72959@xor.obsecurity.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040216063651.GA72959@xor.obsecurity.org> X-Operating-System: FreeBSD cicely12.cicely.de 5.2-CURRENT alpha User-Agent: Mutt/1.5.4i X-Spam-Status: No, hits=-4.9 required=3.0 tests=BAYES_00 autolearn=ham version=2.61 X-Spam-Report: * -4.9 BAYES_00 BODY: Bayesian spam probability is 0 to 1% * [score: 0.0000] X-Spam-Checker-Version: SpamAssassin 2.61 (1.212.2.1-2003-12-09-exp) on cicely5.cicely.de cc: alpha@freebsd.org cc: ticso@cicely.de cc: current@freebsd.org Subject: Re: Scheduling deadlock on alpha? X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: ticso@cicely.de List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Feb 2004 07:07:21 -0000 On Sun, Feb 15, 2004 at 10:36:51PM -0800, Kris Kennaway wrote: > On Mon, Feb 16, 2004 at 07:18:22AM +0100, Bernd Walter wrote: > > On Sun, Feb 15, 2004 at 09:58:40PM -0800, Kris Kennaway wrote: > > > One of the alpha package machines seems to have deadlocked; no > > > processes are running, but the kernel itself responds to pings, and I > > > can break to DDB: > > > > How long have you waited? > > It seems that the system was busy waiting for page faults and swap. > > I've seen conditions lately where this can block the system for a very > > long time in case there is not enough memory free. > > The number of processes point to memory stress. > > It's been about 1/2 hour now...this machine doesn't seem to have been > under exceptional load compared to the other equivalent alpha package > machines OK - it was not _that_ long, but it was long enough for me to to really think about a hanging machine once. I'm no VM expert, but those two look very strange to me: 7 fffffc0003ca4b40 fffffe0004f38000 0 0 0 0000204 [SLP]VMWait 0xfffffc000068c468] pagedaemon 0 fffffc0000693178 fffffc0000796000 0 0 0 0000200 [SLP]vmwait 0xfffffc00006e4028] swapper At least I think that all others are awaiting them to do their job first. Not to mention about the different writing of the same word. -- B.Walter BWCT http://www.bwct.de ticso@bwct.de info@bwct.de