From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757436Ab3GQVms (ORCPT ); Wed, 17 Jul 2013 17:42:48 -0400 Received: from mx1.redhat.com ([209.132.183.28]:25595 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752941Ab3GQVmp (ORCPT ); Wed, 17 Jul 2013 17:42:45 -0400 Date: Wed, 17 Jul 2013 17:42:35 -0400 From: Dave Jones To: Jan Kara Cc: Linux Kernel , linux-ext4@vger.kernel.org Subject: Re: ext4_da_release_space:1333: ext4_da_release_space: ino 12, to_free 1 with only 0 reserved data blocks Message-ID: <20130717214235.GB12401@redhat.com> Mail-Followup-To: Dave Jones , Jan Kara , Linux Kernel , linux-ext4@vger.kernel.org References: <20130716202533.GA16061@redhat.com> <20130717125322.GA29294@quack.suse.cz> <20130717145218.GA27731@redhat.com> <20130717213850.GA5025@quack.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130717213850.GA5025@quack.suse.cz> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 17, 2013 at 11:38:50PM +0200, Jan Kara wrote: > > It was running this.. https://github.com/kernelslacker/io-tests/blob/master/setup.sh > > in a loop. After about 6 hours, that fell out. It made it all the way through > > every test a few times, which is odd, as the test should be fairly deterministic. > > Ah, I wasn't capturing the fsx seed. I'll do that on the next run. > So inode 12 was likely the file used by fsx. OK. Looking at the script > link, fsx is run as: > /usr/local/bin/fsx -N 250000 -S0 foo & > so the seed is always 0. So it is a deterministic test and there must be > some race with writeback or something that is rarely triggered. Drat. S0 is special. it means 'use timeofday as seed' Dave