From owner-freebsd-stable@FreeBSD.ORG  Tue Apr  8 19:33:47 2014
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Date: Tue, 8 Apr 2014 15:33:46 -0400
Message-ID: <CAFMmRNySM0w9OsDUQax22ZnTm6cSUQYE1eyVKxc+6Em2tn8U2Q@mail.gmail.com>
Subject: Re: GEOM_CONCAT odd behaviour
From: Ryan Stone <rysto32@gmail.com>
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On Tue, Apr 8, 2014 at 2:46 PM, John <freebsd-lists@potato.growveg.org> wrote:
> yeah - might be significant that this started (on another machine) after
> the upgrade from 9.2 to 10-R. In any case, loading the module via
> loader.conf will work. It's just that it used to work by compiling it
> into the kernel.

I believe that setting the tunable:

kern.geom.label.disk_ident.enable=0

should fix your issue.