From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sitsofe Wheeler <sitsofe@yahoo.com>
Subject: Re: Correct way to remove a cache device?
Date: Mon, 31 Mar 2014 13:06:24 +0100
Message-ID: <20140331120623.GA28637@sucs.org>
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To: Daniel Smedegaard Buus <danielbuus@gmail.com>
Cc: linux-bcache@vger.kernel.org

On Mon, Mar 31, 2014 at 01:47:21PM +0200, Daniel Smedegaard Buus wrote:
> 
> I'm trying to figure out what the correct way of taking down a bcache
> cache device is.
> 
> If I echo 1 to /sys/block/BACKING_DEVICE/bcache/detach, and then to
> /sys/fs/bcache/*/unregister, the system will hang. The detach part
> goes well, but immediately after unregistering, it will crash.

Try sleeping at least two seconds between the operations.

-- 
Sitsofe | http://sucs.org/~sits/