From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262591AbTJ3PUs (ORCPT ); Thu, 30 Oct 2003 10:20:48 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262592AbTJ3PUr (ORCPT ); Thu, 30 Oct 2003 10:20:47 -0500 Received: from mta4.rcsntx.swbell.net ([151.164.30.28]:3508 "EHLO mta4.rcsntx.swbell.net") by vger.kernel.org with ESMTP id S262591AbTJ3PUp (ORCPT ); Thu, 30 Oct 2003 10:20:45 -0500 Message-ID: <3FA12A2E.4090308@pacbell.net> Date: Thu, 30 Oct 2003 07:11:42 -0800 From: David Brownell User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2.1) Gecko/20030225 X-Accept-Language: en-us, en, fr MIME-Version: 1.0 To: davidm@hpl.hp.com CC: Greg KH , vojtech@suse.cz, linux-usb-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org Subject: Re: [linux-usb-devel] Re: serious 2.6 bug in USB subsystem? References: <200310272235.h9RMZ9x1000602@napali.hpl.hp.com> <20031028013013.GA3991@kroah.com> <200310280300.h9S30Hkw003073@napali.hpl.hp.com> In-Reply-To: <200310280300.h9S30Hkw003073@napali.hpl.hp.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org David Mosberger wrote: > > On x86, there is no OOps, it just freezes. On ia64, I get a nice MCA > and from that we can infer that a USB host controller read from > address 0xf0000000 caused the problem but since this is asynchronous > to the kernel's code path, the instruction pointer etc. in the MCA > state dump isn't terribly helpful. Does that 0xf0000000 (on ia64) match any obvious address mapping of the null pointer -- like a dma mapping? I'm not sure that if the HID driver were to pass a null buffer pointer, it would be caught anywhere. - Dave