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

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Date:   Tue, 19 Dec 2017 10:17:43 -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 Sun, Dec 17, 2017 at 21:43:50 +0800,
  weiping zhang <zwp10758@...il.com> wrote:
>Hi, thanks for testing, I think you first reproduce this issue(got WARNING
>at device_add_disk) by your own build, then add my debug patch.

The problem is still in rc4. Reverting the commit still fixes the problem. 
I tested that warning level messages should appear using lkdtm. While 
there could be something weird relating to the WARN_ON macro, more likely 
there is something different about the boots with the kernels I build 
(the exact way initramfs is built is probably different) and probably 
that (WARN_ON) code is not getting executed.