From owner-freebsd-fs@FreeBSD.ORG  Mon May 20 20:42:20 2013
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From: John Baldwin <jhb@freebsd.org>
To: freebsd-fs@freebsd.org,
 Rick Macklem <rmacklem@freebsd.org>
Subject: Re: kern/177335: [nfs] [panic] Sleeping on "vmopar" with the
 following non-sleepable locks held: exclusive sleep mutex NFSnode lock
 (NFSnode lock)
Date: Mon, 20 May 2013 15:31:45 -0400
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 (bigwig.baldwin.cx); Mon, 20 May 2013 16:42:20 -0400 (EDT)
Cc: kib@freebsd.org, linimon@freebsd.org
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On Sunday, May 19, 2013 11:32:54 pm linimon@freebsd.org wrote:
> Old Synopsis: Sleeping on "vmopar" with the following non-sleepable locks 
held: exclusive sleep mutex NFSnode lock (NFSnode lock)
> New Synopsis: [nfs] [panic] Sleeping on "vmopar" with the following non-
sleepable locks held: exclusive sleep mutex NFSnode lock (NFSnode lock)
> 
> Responsible-Changed-From-To: freebsd-bugs->freebsd-fs
> Responsible-Changed-By: linimon
> Responsible-Changed-When: Mon May 20 03:32:02 UTC 2013
> Responsible-Changed-Why: 
> Over to maintainer(s).

I think this issue might have been recently fixed in HEAD, specifically in 
r248567 and r248581.

-- 
John Baldwin