Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756469AbdLOTyi (ORCPT ); Fri, 15 Dec 2017 14:54:38 -0500 Received: from wolff.to ([98.103.208.27]:35376 "HELO wolff.to" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1755939AbdLOTyg (ORCPT ); Fri, 15 Dec 2017 14:54:36 -0500 Date: Fri, 15 Dec 2017 13:51:22 -0600 From: Bruno Wolff III To: weiping zhang Cc: Laura Abbott , Jan Kara , Jens Axboe , linux-mm@kvack.org, Linux Kernel Mailing List , regressions@leemhuis.info, linux-block@vger.kernel.org Subject: Re: Regression with a0747a859ef6 ("bdi: add error handle for bdi_debug_register") Message-ID: <20171215195122.GA27126@wolff.to> References: <20171214082452.GA16698@wolff.to> <20171214100927.GA26167@localhost.didichuxing.com> <20171214154136.GA12936@wolff.to> <20171215014417.GA17757@wolff.to> <20171215111050.GA30737@wolff.to> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.1 (2017-09-22) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 626 Lines: 12 On Fri, Dec 15, 2017 at 22:02:20 +0800, weiping zhang wrote: >Sorry to let you confuse, WARN_ON means we catch log as following: >WARNING: CPU: 3 PID: 3486 at block/genhd.c:680 device_add_disk+0x3d9/0x460 I do not get this warning for any of the kernels I build, whether from Linus' tree or Josh Boyer's Fedora tree. It shows up when I test kernels built by Fedora, but those don't have your debug patch. I do not know what is different. Do you have any ideas? Most likely I won't be able to test any more kernels until Monday (unless I can use most of my most recent build over again very soon).