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Date:   Thu, 21 Dec 2017 23:31:40 +0800
From:   weiping zhang <zwp10758@...il.com>
To:     Bruno Wolff III <bruno@...ff.to>
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,
        weiping zhang <zhangweiping@...ichuxing.com>,
        linux-block@...r.kernel.org
Subject: Re: Regression with a0747a859ef6 ("bdi: add error handle for bdi_debug_register")

2017-12-21 23:18 GMT+08:00 Bruno Wolff III <bruno@...ff.to>:
> On Thu, Dec 21, 2017 at 22:01:33 +0800,
>  weiping zhang <zwp10758@...il.com> wrote:
>>
>> Hi,
>> how do you do bisect ?build all kernel commit one by one ?
>> as you did before:
>> https://bugzilla.redhat.com/show_bug.cgi?id=1520982
>
>
> I just did the one bisect using Linus' tree. After each build, I would do a
> test boot and see if the boot was normal or if I got errors and an eventual
> hang before boot.
>
> Since then I have used git revert to revert just the problem commit from
> later kernels (such as v4.15-rc4) and when I do the system boots normally.
> And when I don't do the revert or just use stock Fedora kernels the problem
> occurs every time.
does every time boot fail can trigger WANRING in device_add_disk ?

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