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From: John Baldwin <jhb@freebsd.org>
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Date: Fri, 31 Aug 2012 14:11:09 -0400
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Cc: 
Subject: [PATCH] Add locking to aha(4)
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I have patches to add locking to aha(4) and mark it MPSAFE.  The patches are 
from HEAD but should apply to 8 or 9.  If you test it on 8 or 9 please enable 
INVARIANTS for at least the initial testing.  Thanks.

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

-- 
John Baldwin