Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753493AbdLURqH (ORCPT ); Thu, 21 Dec 2017 12:46:07 -0500 Received: from mail-wm0-f44.google.com ([74.125.82.44]:32941 "EHLO mail-wm0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751865AbdLURqC (ORCPT ); Thu, 21 Dec 2017 12:46:02 -0500 X-Google-Smtp-Source: ACJfBovuK0+D1ODAXd2aDWLnyUnXntO+2iEL1gCAkCYVdjTuoRs6oz1AEOprxdfHfX9tPSTRIEesqebnT0GspCavMzI= MIME-Version: 1.0 In-Reply-To: <14f04d43-728a-953f-e07c-e7f9d5e3392d@kernel.dk> References: <20171221130057.GA26743@wolff.to> <20171221151843.GA453@wolff.to> <20171221153631.GA2300@wolff.to> <20171221164221.GA23680@wolff.to> <14f04d43-728a-953f-e07c-e7f9d5e3392d@kernel.dk> From: weiping zhang Date: Fri, 22 Dec 2017 01:46:00 +0800 Message-ID: Subject: Re: Regression with a0747a859ef6 ("bdi: add error handle for bdi_debug_register") To: Jens Axboe Cc: Bruno Wolff III , Laura Abbott , Jan Kara , linux-mm@kvack.org, Linux Kernel Mailing List , regressions@leemhuis.info, weiping zhang , linux-block@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 825 Lines: 19 2017-12-22 1:02 GMT+08:00 Jens Axboe : > On 12/21/17 9:42 AM, Bruno Wolff III wrote: >> On Thu, Dec 21, 2017 at 23:48:19 +0800, >> weiping zhang wrote: >>>> output you want. I never saw it for any kernels I compiled myself. Only when >>>> I test kernels built by Fedora do I see it. >>> see it every boot ? >> >> I don't look every boot. The warning gets scrolled of the screen. Once I see >> the CPU hang warnings I know the boot is failing. I don't always look >> at journalctl later to see what's there. > > I'm going to revert a0747a859ef6 for now, since we're now 8 days into this > and no progress has been made on fixing it. > OK, you can revert it first. it seems MD produce a duplicated major:minor pair, which lead to create debugfs dir failed, but it's under debugging... >