linux-kernel - Re: [PATCH 0/5] block: replace incorrect uses of GENHD_FL

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Date:   Wed, 11 Aug 2021 06:19:28 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     luomeng <luomeng12@...wei.com>
Cc:     Luis Chamberlain <mcgrof@...nel.org>, axboe@...nel.dk,
        hare@...e.de, bvanassche@....org, ming.lei@...hat.com,
        hch@...radead.org, jack@...e.cz, osandov@...com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] block: replace incorrect uses of GENHD_FL_UP

On Wed, Aug 11, 2021 at 10:42:20AM +0800, luomeng wrote:
> Hi:
>    When the fuzz test injected memory allocation failed, I had this BUG_ON:
> kernel BUG at fs/sysfs/group.c:116.
>   The cause of the bug_ON is that the add_disk memory fails to be allocated
> but no error processing is performed.
>   I find your patches add error processing. So what is your next step with
> these patches.

I have one more pending series on top of this one I need to submit here:

http://git.infradead.org/users/hch/block.git/shortlog/refs/heads/alloc_disk

to make sure the disk always has a valid queue reference.  After that
Luis work to return an error from add_disk should be much easier bause
we not have defined state.