Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1765078AbXJREVW (ORCPT ); Thu, 18 Oct 2007 00:21:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752190AbXJREVE (ORCPT ); Thu, 18 Oct 2007 00:21:04 -0400 Received: from smtp2.linux-foundation.org ([207.189.120.14]:55623 "EHLO smtp2.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751680AbXJREVB (ORCPT ); Thu, 18 Oct 2007 00:21:01 -0400 Date: Wed, 17 Oct 2007 21:20:16 -0700 (PDT) From: Linus Torvalds To: Mark Lord cc: David Miller , fujita.tomonori@lab.ntt.co.jp, jens.axboe@oracle.com, mingo@elte.hu, linux-kernel@vger.kernel.org, jgarzik@pobox.com, alan@lxorguk.ukuu.org.uk, tomof@acm.org Subject: Re: [bug] ata subsystem related crash with latest -git In-Reply-To: <4716DB9A.2060809@rtr.ca> Message-ID: References: <20071018080048O.fujita.tomonori@lab.ntt.co.jp> <20071017.181907.63126798.davem@davemloft.net> <4716D6B1.8010309@rtr.ca> <4716DB9A.2060809@rtr.ca> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1081 Lines: 29 On Thu, 18 Oct 2007, Mark Lord wrote: > > Oh.. so this bug is supposed to only bite with DEBUG_PAGEALLOC=y ?? Yeah, this particular one really should only bite you with DEBUG_PAGEALLOC. The SG code potentially _derefences_ a field past the end of the SG array, but it should be a read, and the result should never be used (it's used to calculate the pointer to past the end of the queue, so if it's used, there's another bug lurking). > Then something else is broken, perhaps. I just saw a long traceback > scroll off the top of the screen, with lots of bio_* functions in the > list and assumed it was the same bug. > > Mmm.. I'll get out the camera and try it again now.. Please do. I wouldn't be surprised if it's also related to the SG changes, but I don't think it's the exact particular bug that Ingo saw. Linus - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/