From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sitsofe Wheeler Subject: Re: BLKZEROOUT not zeroing md dev on VMDK Date: Wed, 15 Jun 2016 22:33:21 +0100 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 Return-path: Content-Disposition: inline In-Reply-To: <1466014718999.6976@vmware.com> Sender: linux-kernel-owner@vger.kernel.org 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 List-Id: linux-raid.ids 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/