From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io0-f200.google.com (mail-io0-f200.google.com [209.85.223.200]) by kanga.kvack.org (Postfix) with ESMTP id D668C6B0033 for ; Thu, 21 Dec 2017 13:17:53 -0500 (EST) Received: by mail-io0-f200.google.com with SMTP id c196so17735482ioc.3 for ; Thu, 21 Dec 2017 10:17:53 -0800 (PST) Received: from wolff.to (wolff.to. [98.103.208.27]) by mx.google.com with SMTP id 138si5568668itu.115.2017.12.21.10.17.52 for ; Thu, 21 Dec 2017 10:17:52 -0800 (PST) Date: Thu, 21 Dec 2017 12:15:31 -0600 From: Bruno Wolff III Subject: Re: Regression with a0747a859ef6 ("bdi: add error handle for bdi_debug_register") Message-ID: <20171221181531.GA21050@wolff.to> References: <20171221130057.GA26743@wolff.to> <20171221151843.GA453@wolff.to> <20171221153631.GA2300@wolff.to> <20171221164221.GA23680@wolff.to> <14f04d43-728a-953f-e07c-e7f9d5e3392d@kernel.dk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <14f04d43-728a-953f-e07c-e7f9d5e3392d@kernel.dk> Sender: owner-linux-mm@kvack.org List-ID: To: Jens Axboe Cc: weiping zhang , Laura Abbott , Jan Kara , linux-mm@kvack.org, Linux Kernel Mailing List , regressions@leemhuis.info, weiping zhang , linux-block@vger.kernel.org On Thu, Dec 21, 2017 at 10:02:15 -0700, Jens Axboe wrote: >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. One important thing I have just found is that it looks like the problem only happens when booting in enforcing mode. If I boot in permissive mode it does not happen. My home machines are currently set to boot in permissive mode and I'll test this evening to see if I can reproduce the problem if I change them to enforcing mode. If so I'll be able to do lots of testing during my vacation. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org