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Date:   Thu, 21 Dec 2017 17:16:03 -0600
From:   Bruno Wolff III <bruno@...ff.to>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     weiping zhang <zwp10758@...il.com>,
        Laura Abbott <labbott@...hat.com>, Jan Kara <jack@...e.cz>,
        linux-mm@...ck.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        regressions@...mhuis.info,
        weiping zhang <zhangweiping@...ichuxing.com>,
        linux-block@...r.kernel.org
Subject: Re: Regression with a0747a859ef6 ("bdi: add error handle for
 bdi_debug_register")

On Thu, Dec 21, 2017 at 12:15:31 -0600,
  Bruno Wolff III <bruno@...ff.to> wrote:
>
>One important thing I have just found is that it looks like the 
>problem only happens when booting in enforcing mode. If I boot in 
>permissive mode it does not happen. My home machines are currently set 
>to boot in permissive mode and I'll test this evening to see if I can 
>reproduce the problem if I change them to enforcing mode. If so I'll 
>be able to do lots of testing during my vacation.

Enforcing mode alone isn't enough as I tested that one one machine at 
home and it didn't trigger the problem. I'll try another machine late 
tonight.

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