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

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Date:   Fri, 22 Dec 2017 01:46:00 +0800
From:   weiping zhang <zwp10758@...il.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Bruno Wolff III <bruno@...ff.to>,
        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")

2017-12-22 1:02 GMT+08:00 Jens Axboe <axboe@...nel.dk>:
> On 12/21/17 9:42 AM, Bruno Wolff III wrote:
>> On Thu, Dec 21, 2017 at 23:48:19 +0800,
>>   weiping zhang <zwp10758@...il.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.
>
> I'm going to revert a0747a859ef6 for now, since we're now 8 days into this
> and no progress has been made on fixing it.
>
OK, you can revert it first.
it seems MD produce a duplicated major:minor pair, which lead to create
debugfs dir failed, but it's under debugging...
>