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Date: Tue, 28 Aug 2012 13:43:14 -0400
From: Jim Rees <rees@umich.edu>
To: Frank Nicholas <frank@nicholasfamilycentral.com>
Cc: Bryan Schumaker <bjschuma@netapp.com>, linux-nfs@vger.kernel.org,
        "Trond.Myklebust@netapp.com" <Trond.Myklebust@netapp.com>,
        "bfields@fieldses.org" <bfields@fieldses.org>
Subject: Re: kernel BUG at fs/nfs/idmap.c:684!
Message-ID: <20120828174314.GA2202@umich.edu>
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Frank Nicholas wrote:

  Thanks for the quick reply.
  
  The patches applied cleanly.  I've rebuilt my kernel.  The reboot will
  have to wait until I have physical access to the machine to do a hard
  power off…  Unless you know of some way to clean up the hung NFS items so
  I can do a reboot.  Currently if I try a 'shutdown -r now', the system
  hangs on trying to clean up the NFS items.

Did you try "reboot -f"?