From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eryu Guan Subject: Re: kernel BUG at block/bio.c:1787! while initializing scsi_debug on ppc64 host Date: Tue, 5 Jan 2016 19:57:35 +0800 Message-ID: <20160105115735.GA21068@eguan.usersys.redhat.com> References: <20151211115340.GB19209@eguan.usersys.redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mail-pf0-f172.google.com ([209.85.192.172]:34139 "EHLO mail-pf0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751188AbcAEL6l (ORCPT ); Tue, 5 Jan 2016 06:58:41 -0500 Received: by mail-pf0-f172.google.com with SMTP id e65so166470256pfe.1 for ; Tue, 05 Jan 2016 03:58:41 -0800 (PST) Content-Disposition: inline In-Reply-To: <20151211115340.GB19209@eguan.usersys.redhat.com> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: linux-scsi@vger.kernel.org Cc: "Martin K. Petersen" On Fri, Dec 11, 2015 at 07:53:40PM +0800, Eryu Guan wrote: > Hi, > > I saw this kernel BUG_ON on 4.4-rc4 kernel, and this can be reproduced > easily on ppc64 host by: > > modprobe scsi_debug sector_size=512 physblk_exp=3 dev_size_mb=256 > > And I bisected to this commit > > commit ca369d51b3e1649be4a72addd6d6a168cfb3f537 > Author: Martin K. Petersen > Date: Fri Nov 13 16:46:48 2015 -0500 > > block/sd: Fix device-imposed transfer length limits > > I confirmed by reverting this commit on top of 4.4-rc4 kernel and test > passed. Hi, Any updates on this? It's still reproducible with 4.4-rc8 kernel, and still blocks some of my tests :) Thanks, Eryu