linux-kernel - Re: Regression with a0747a859ef6 ("bdi: add error handle for bdi_debug

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Message-ID: <20171215111050.GA30737@wolff.to>
Date:   Fri, 15 Dec 2017 05:10:50 -0600
From:   Bruno Wolff III <bruno@...ff.to>
To:     weiping zhang <zwp10758@...il.com>
Cc:     Laura Abbott <labbott@...hat.com>, Jan Kara <jack@...e.cz>,
        Jens Axboe <axboe@...nel.dk>, linux-mm@...ck.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        regressions@...mhuis.info, linux-block@...r.kernel.org
Subject: Re: Regression with a0747a859ef6 ("bdi: add error handle for
 bdi_debug_register")

On Fri, Dec 15, 2017 at 10:04:32 +0800,
  weiping zhang <zwp10758@...il.com> wrote:
>I just want to know WARN_ON WHAT in device_add_disk,
>if bdi_register_owner return error code, it may fail at any step of following:

Was that output in the original boot log? I didn't see anything there 
that had the string WARN_ON. The first log was from a Fedora kernel. The 
second from a kernel I built. I used a Fedora config though. The config 
was probably from one of their nodebug kernels, I could build another 
one using a config from a debug kernel. Would that likely provide what 
you are looking for?