From owner-freebsd-stable@FreeBSD.ORG  Sat Jul 21 16:03:56 2012
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From: Chris Rees <crees@FreeBSD.org>
Date: Sat, 21 Jul 2012 17:03:23 +0100
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To: Daniel Braniss <danny@cs.huji.ac.il>
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Cc: stable@freebsd.org, Rick Macklem <rmacklem@uoguelph.ca>,
	David O'Brien <obrien@freebsd.org>
Subject: Re: lsof needs update
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On 21 July 2012 10:36, Daniel Braniss <danny@cs.huji.ac.il> wrote:
> hi, lsof on freebsd 9.1:
> COMMAND  PID USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
> ntpd    1707 root  cwd                                         unknown file
> system type: newnfs
> ntpd    1707 root  rtd                                         unknown file
> system type: newnfs
> ntpd    1707 root  txt                                         unknown file
> system type: newnfs
> ntpd    1707 root  txt                                         unknown file
> system type: newnfs
> ntpd    1707 root  txt                                         unknown file
> system type: newnfs
> ntpd    1707 root  txt                                         unknown file
> system type: newnfs
> ntpd    1707 root  txt                                         unknown file
> system type: newnfs
> ntpd    1707 root  txt                                         unknown file
> system type: newnfs
> ntpd    1707 root  txt                                         unknown file
> system type: newnfs
> ntpd    1707 root  txt                                         unknown file
> system type: newnfs

Did you recompile lsof when upgrading?

Chris