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Date: Fri, 19 Oct 2012 20:25:26 +0300
From: Andriy Gapon <avg@FreeBSD.org>
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To: Sean Chittenden <sean@chittenden.org>
Subject: Re: ZFS crashing during snapdir lookup for non-existent snapshot...
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Sean,

do you still experience this problem?
If so, you may to try the following patch: http://people.freebsd.org/~avg/zfs-vfs.diff

The patch is against quite recent head.
Not sure how well it would apply  to the stable branches (if you use those), but
it definitely needs the following two commits from head:
http://svnweb.freebsd.org/base?view=revision&revision=241556
http://svnweb.freebsd.org/base?view=revision&revision=241628

-- 
Andriy Gapon