From owner-freebsd-alpha@FreeBSD.ORG Tue Nov 4 15:31:58 2003 Return-Path: Delivered-To: freebsd-alpha@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id B88BC16A4D6 for ; Tue, 4 Nov 2003 15:31:58 -0800 (PST) Received: from srv1.cosmo-project.de (srv1.cosmo-project.de [213.83.6.106]) by mx1.FreeBSD.org (Postfix) with ESMTP id 65ACF43F93 for ; Tue, 4 Nov 2003 15:31:56 -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) hA4NVnt2068198 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=OK); Wed, 5 Nov 2003 00:31:51 +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 hA4NVl2q068641 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 5 Nov 2003 00:31:48 +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 hA4NVl2u074149; Wed, 5 Nov 2003 00:31:47 +0100 (CET) (envelope-from ticso@cicely12.cicely.de) Received: (from ticso@localhost) by cicely12.cicely.de (8.12.10/8.12.10/Submit) id hA4NVlFf074148; Wed, 5 Nov 2003 00:31:47 +0100 (CET) (envelope-from ticso) Date: Wed, 5 Nov 2003 00:31:47 +0100 From: Bernd Walter To: Kris Kennaway Message-ID: <20031104233146.GL42463@cicely12.cicely.de> References: <20031101103955.GA42891@rot13.obsecurity.org> <20031104031740.GA67484@rot13.obsecurity.org> <20031104124826.GH42463@cicely12.cicely.de> <20031104175552.GA70699@rot13.obsecurity.org> <20031104221251.GJ42463@cicely12.cicely.de> <20031104221826.GC15210@freebie.xs4all.nl> <20031104230040.GK42463@cicely12.cicely.de> <20031104231848.GA72581@rot13.obsecurity.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20031104231848.GA72581@rot13.obsecurity.org> X-Operating-System: FreeBSD cicely12.cicely.de 5.1-CURRENT alpha User-Agent: Mutt/1.5.4i cc: alpha@freebsd.org cc: ticso@cicely.de Subject: Re: New alpha 5.x bug X-BeenThere: freebsd-alpha@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: ticso@cicely.de List-Id: Porting FreeBSD to the Alpha List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Nov 2003 23:31:58 -0000 On Tue, Nov 04, 2003 at 03:18:48PM -0800, Kris Kennaway wrote: > On Wed, Nov 05, 2003 at 12:00:40AM +0100, Bernd Walter wrote: > > > > Hmmm.. the package builders are Miatas right? > > > > > > Are they using a PCI add-in ethernet card? > > > > > > I'm thinking of the Miata's rather fragile DMA stuff in the Pyxis > > > core logic chip. > > I don't think the corruption happened during network transit. For > example, they're pushed to the server via scp, so data corruption of > the ethernet packet would cause it to bounce off scp's integrity > protection. Well - this should be handled at TCP level by just dropping the packet and waiting for retransmit without the application ever to know. But if the DMA corrupts unrelated data. However - it sounds unlikey to not corrupt other kind of data as well. The question is what kind of bug this is to only trigger on the port cluster. vm/pipe sounds reasonable to believe for this kind of corruption, but it never happened for me. Possibly I'm not pushing vm that much. I wonder if setting vm.idlezero_enable=0 has an influence - this will not change the danger of this bug, but if it changes sympotoms might give a good indication of the direction to search. -- B.Walter BWCT http://www.bwct.de ticso@bwct.de info@bwct.de