From owner-freebsd-stable@FreeBSD.ORG  Wed Sep 26 14:19:44 2012
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From: John Baldwin <jhb@freebsd.org>
Date: Wed, 26 Sep 2012 10:19:40 -0400
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Cc: 
Subject: [PATCH] Add locking to dpt(4)
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I have patches to add locking to dpt(4) and make it MPSAFE (along with some 
other fixes).  I would appreciate any testing folks are able to do.  The 
patches are against HEAD but should apply to 8 or 9.  Please ensure you have 
INVARIANTS and INVARIANT_SUPPORT enabled for any initial testing that you do.  
Thanks!

http://www.FreeBSD.org/~jhb/patches/dpt_locking.patch

-- 
John Baldwin