From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it0-f70.google.com (mail-it0-f70.google.com [209.85.214.70]) by kanga.kvack.org (Postfix) with ESMTP id 2A3596B0253 for ; Fri, 15 Dec 2017 11:34:02 -0500 (EST) Received: by mail-it0-f70.google.com with SMTP id 207so15554571iti.5 for ; Fri, 15 Dec 2017 08:34:02 -0800 (PST) Received: from wolff.to (wolff.to. [98.103.208.27]) by mx.google.com with SMTP id m62si5180825iof.251.2017.12.15.08.34.00 for ; Fri, 15 Dec 2017 08:34:00 -0800 (PST) Date: Fri, 15 Dec 2017 10:30:48 -0600 From: Bruno Wolff III Subject: Re: Regression with a0747a859ef6 ("bdi: add error handle for bdi_debug_register") Message-ID: <20171215163048.GA15928@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: Sender: owner-linux-mm@kvack.org List-ID: 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 On Fri, Dec 15, 2017 at 22:02:20 +0800, weiping zhang wrote: > >Yes, please help reproduce this issue include my debug patch. Reproduce means >we can see WARN_ON in device_add_disk caused by failure of bdi_register_owner. I'm not sure why yet, but I'm only getting the warning message you want with Fedora kernels, not the ones I am building (with or without your test patch). I'll attach a debug config file if you want to look there. But in theory that should be essentially what Fedora is using for theirs. They probably have some out of tree patches they are applying, but I wouldn't expect those to make a difference here. I think they now have a tree somewhere that I can try to build from that has their patches applied to the upstream kernel and if I can find it I will try building it just to test this out. I only have about 6 hours of physical access to the machine exhibiting the problem, and after that I won't be able to do test boots until Monday. -- 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