From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 4/4] md: fast clone bio in bio_clone_mddev()
Date: Mon, 6 Feb 2017 06:24:51 -0800
Message-ID: <20170206142451.GA17008@infradead.org>
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To: Ming Lei <tom.leiming@gmail.com>
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On Mon, Feb 06, 2017 at 06:43:32PM +0800, Ming Lei wrote:
> In theory, ->bio_set still might be NULL in case of failed memory allocation,
> please see md_run().

And that's something that should be fixed.  Silently not having mempool
is very bad behavior.