From: Jeff Moyer Subject: Re: [PATCH 0/3 v5][RFC] ext3/4: enhance fsync performance when using CFQ Date: Mon, 28 Jun 2010 09:58:51 -0400 Message-ID: References: <1277242502-9047-1-git-send-email-jmoyer@redhat.com> <4C21D442.8080703@oracle.com> <4C22F316.3080009@oracle.com> <4C284419.3000905@oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: axboe@kernel.dk, vgoyal@redhat.com, linux-kernel@vger.kernel.org, linux-ext4@vger.kernel.org, Joel Becker , Sunil Mushran , "ocfs2-devel\@oss.oracle.com" To: Tao Ma Return-path: Received: from mx1.redhat.com ([209.132.183.28]:16727 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751432Ab0F1N66 (ORCPT ); Mon, 28 Jun 2010 09:58:58 -0400 In-Reply-To: <4C284419.3000905@oracle.com> (Tao Ma's message of "Mon, 28 Jun 2010 14:41:29 +0800") Sender: linux-ext4-owner@vger.kernel.org List-ID: Tao Ma writes: > btw, I also met with a NULL pointer deference in cfq_yield. I have > attached the null.log also. This seems to be related to the previous > deadlock and happens when I try to remount the same volume after > reboot and ocfs2 try to do some recovery. Since I can't reproduce your binary kernel even with your .config, could you send me the disassembly of the cfq_yield function from your vmlinux binary? Thanks! Jeff