From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ming Lin <mlin@kernel.org>
Subject: Re: bcache fails after reboot if discard is enabled
Date: Wed, 29 Apr 2015 11:00:02 -0700
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To: Dan Merillat <dan.merillat@gmail.com>
Cc: Kai Krakow <hurikhan77@gmail.com>, linux-bcache@vger.kernel.org

On Wed, Apr 29, 2015 at 10:48 AM, Dan Merillat <dan.merillat@gmail.com> wrote:
> Killed it again - enabled bcache discard, copied a few TB of data from
> the backup the the drive, rebooted, different error
> "bcache: bch_cached_dev_attach() Couldn't find uuid for <REDACTED> in set"
>
> The exciting failure that required reboot this time was an infinite
> spin in bcache_writeback.
>
> I'll give it another shot at narrowing down exactly what causes the
> failure before I give up on bcache entirely.

Don't know if it helps or not.Maybe you can have a try these patches:
https://git.kernel.org/cgit/linux/kernel/git/mlin/linux.git/log/?h=bcache

Ming