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Date: Thu, 10 Dec 2009 14:33:39 +0200
From: Andriy Gapon <avg@icyb.net.ua>
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To: Jeremie Le Hen <jeremie@le-hen.org>
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Cc: freebsd-current@FreeBSD.org
Subject: Re: Panic while doing zfs rename
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on 10/12/2009 09:21 Jeremie Le Hen said the following:
...
> % zfs_statfs(866b2a10,866b2a70,1d8,cb41c844,865a3a10,...) at zfs_statfs+0x39
> % __vfs_statfs(866b2a10,cb41c844,0,0,0,...) at __vfs_statfs+0x1f
> % nullfs_statfs(865a3a10,865a3a70,806bd68b,865a3a70,865a3a10,...) at nullfs_statfs+0x46
> % __vfs_statfs(865a3a10,865a3a70,1d8,a5889340,cb41cb78,...) at __vfs_statfs+0x1f

And you also seem to have nullfs in the picture.
Did you by a chance renamed a zfs filesystem under nullfs?

-- 
Andriy Gapon