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Date:   Fri, 15 Dec 2017 09:22:21 +0800
From:   weiping zhang <>
To:     Bruno Wolff III <>
Cc:     Laura Abbott <>, Jan Kara <>,
        Jens Axboe <>,,
        Linux Kernel Mailing List <>,,
Subject: Re: Regression with a0747a859ef6 ("bdi: add error handle for bdi_debug_register")

2017-12-14 23:41 GMT+08:00 Bruno Wolff III <>:
> On Thu, Dec 14, 2017 at 18:09:27 +0800,
>  weiping zhang <> wrote:
>> It seems something wrong with bdi debugfs register, could you help
>> test the forllowing debug patch, I add some debug log, no function
>> change, thanks.
> I applied your patch to d39a01eff9af1045f6e30ff9db40310517c4b45f and there
> were some new debug messages in the dmesg output. Hopefully this helps. I
> also added the patch and output to the Fedora bug for people following
> there.

Hi Bruno,

Thanks your testing, but I cann't find WARN_ON in device_add_disk from
this boot1.log, could you help reproduce that issue? And does this issue can be
triggered at every bootup ?


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