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Date: Thu, 14 Dec 2017 18:09:27 +0800
From: weiping zhang <zhangweiping@didichuxing.com>
Subject: Re: Regression with a0747a859ef6 ("bdi: add error handle for
 bdi_debug_register")
Message-ID: <20171214100927.GA26167@localhost.didichuxing.com>
References: <b1415a6d-fccd-31d0-ffa2-9b54fa699692@redhat.com>
 <20171214082452.GA16698@wolff.to>
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Sender: owner-linux-mm@kvack.org
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To: Bruno Wolff III <bruno@wolff.to>
Cc: Laura Abbott <labbott@redhat.com>, Jan Kara <jack@suse.cz>, Jens Axboe <axboe@kernel.dk>, linux-mm@kvack.org, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, regressions@leemhuis.info, linux-block@vger.kernel.org

On Thu, Dec 14, 2017 at 02:24:52AM -0600, Bruno Wolff III wrote:
> On Wed, Dec 13, 2017 at 16:54:17 -0800,
>  Laura Abbott <labbott@redhat.com> wrote:
> >Hi,
> >
> >Fedora got a bug report https://bugzilla.redhat.com/show_bug.cgi?id=1520982
> >of a boot failure/bug on Linus' master (full bootlog at the bugzilla)
> 
> I'm available for testing. The problem happens on my x86_64 Dell
> Workstation, but not an old i386 server or an x86_64 mac hardware
> based laptop.

Hi,

It seems something wrong with bdi debugfs register, could you help
test the forllowing debug patch, I add some debug log, no function
change, thanks.