From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932875AbcFOVdj (ORCPT ); Wed, 15 Jun 2016 17:33:39 -0400 Received: from silver.sucs.swan.ac.uk ([137.44.10.1]:57680 "EHLO silver.sucs.swan.ac.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753129AbcFOVdf (ORCPT ); Wed, 15 Jun 2016 17:33:35 -0400 Date: Wed, 15 Jun 2016 22:33:21 +0100 From: Sitsofe Wheeler To: Arvind Kumar Cc: Tom Yan , "Darrick J. Wong" , Shaohua Li , Jens Axboe , VMware PV-Drivers , "linux-raid@vger.kernel.org" , "linux-scsi@vger.kernel.org" , "linux-block@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Petr Vandrovec Subject: Re: BLKZEROOUT not zeroing md dev on VMDK Message-ID: <20160615213320.GA9527@sucs.org> References: <20160518223616.GA409@sucs.org> <20160527041824.GC9418@birch.djwong.org> <1466014718999.6976@vmware.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1466014718999.6976@vmware.com> 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, Jun 15, 2016 at 06:17:37PM +0000, Arvind Kumar wrote: > It is possibly some race. We saw a WRITE SAME related issue in past > for which Petr sent out a patch but looks like the patch didn't make > it. :( > > https://groups.google.com/forum/#!topic/linux.kernel/1WGDSlyY0y0 Indeed - the investigation you folks did is linked to within the upstream Bugzilla bug (see https://bugzilla.kernel.org/show_bug.cgi?id=118581#c2 ). Hopefully this issue will be resolved but there's still some debate over on http://thread.gmane.org/gmane.linux.kernel/2236800 . The problem is that it is causing real problems in stable kernels (data not being correctly zero'd) today... -- Sitsofe | http://sucs.org/~sits/