From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932352Ab2LNUb1 (ORCPT ); Fri, 14 Dec 2012 15:31:27 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:52813 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932157Ab2LNUb0 (ORCPT ); Fri, 14 Dec 2012 15:31:26 -0500 Message-ID: <50CB8C74.3090102@canonical.com> Date: Fri, 14 Dec 2012 15:30:44 -0500 From: Joseph Salisbury User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:16.0) Gecko/20121017 Thunderbird/16.0.1 MIME-Version: 1.0 To: martin.petersen@oracle.com CC: Kernel Team , linux-kernel@vger.kernel.org, snitzer@redhat.com, jgarzik@redhat.com, JBottomley@Parallels.com Subject: [v3.7 Regression] [SCSI] sd: Implement support for WRITE SAME Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Martin, A bug was opened against the Ubuntu kernel[0]. After a kernel bisect, it was found that reverting the following commit resolved this bug: commit 5db44863b6ebbb400c5e61d56ebe8f21ef48b1bd Author: Martin K. Petersen Date: Tue Sep 18 12:19:32 2012 -0400 [SCSI] sd: Implement support for WRITE SAME The regression was introduced as of v3.7-rc7. The bug can be reproduced with the following commands, which will operate on a virtual scsi_debug device, so they won't change any data on the test system. However, this will completely crash the system: sudo modprobe scsi_debug sudo luksformat -t ext4 /dev/sdb <- Or whatever device gets assigned after inserting scsi_debug. sudo cryptsetup luksOpen /dev/sdb treasure Everything works fine up to here, but the following will cause the crash: sudo mount /dev/mapper/treasure /mnt The bug can be reproduced on bare metal, in a VM and on i386 or amd64. I see that you are the author of this patch, so I wanted to run this by you. I was thinking of requesting a revert for v3.7, but I wanted to get your feedback first. Thanks, Joe [0] https://bugs.launchpad.net/bugs/1089818