Date: Thu, 21 Dec 2017 10:42:21 -0600
From: Bruno Wolff III <bruno@wolff.to>
To: weiping zhang <zwp10758@gmail.com>
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,
        weiping zhang <zhangweiping@didichuxing.com>,
        linux-block@vger.kernel.org
Subject: Re: Regression with a0747a859ef6 ("bdi: add error handle for
 bdi_debug_register")
Message-ID: <20171221164221.GA23680@wolff.to>
References: <b1415a6d-fccd-31d0-ffa2-9b54fa699692@redhat.com>
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 <20171221151843.GA453@wolff.to>
 <CAA70yB496Nuy2FM5idxLZthBwOVbhtsZ4VtXNJ_9mj2cvNC4kA@mail.gmail.com>
 <20171221153631.GA2300@wolff.to>
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On Thu, Dec 21, 2017 at 23:48:19 +0800,
  weiping zhang <zwp10758@gmail.com> 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.