From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755561AbWKVJZJ (ORCPT ); Wed, 22 Nov 2006 04:25:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755563AbWKVJZI (ORCPT ); Wed, 22 Nov 2006 04:25:08 -0500 Received: from mtagate1.uk.ibm.com ([195.212.29.134]:5529 "EHLO mtagate1.uk.ibm.com") by vger.kernel.org with ESMTP id S1755573AbWKVJZG (ORCPT ); Wed, 22 Nov 2006 04:25:06 -0500 From: Hoang-Nam Nguyen To: Roland Dreier Subject: Re: [PATCH 2.6.19] ehca: bug fix: use wqe offset instead wqe address to determine pending work requests Date: Wed, 22 Nov 2006 10:29:09 +0100 User-Agent: KMail/1.8.2 Cc: rolandd@cisco.com, linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org, openib-general@openib.org, raisch@de.ibm.com References: <200611202354.13030.hnguyen@linux.vnet.ibm.com> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200611221029.10077.hnguyen@linux.vnet.ibm.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org (2nd try, since I forgot to post this on the mailing list) On Tuesday 21 November 2006 17:47, Roland Dreier wrote: > Umm, it's really late to merge things for 2.6.19. How severe is this > bug? Why has it not been found until now if it causing crashes? We found this bug actually through a code review by random. Since (un)fortunately the queue pages were layouted in order, we've not seen it earlier. It's certainly a bug and can cause kernel panic if above observation is not met, probably in stress situation of system. That means the "former" code accesses next page that it has not allocated. Thanks Nam