[gentoo-user] umount nfs share

[Harry Putnam]

I'm trying t umount an nfs mounted share but am told the resource is
busy.  umount -f fails too.

So first I turned off all the xterms I had running which should have
killed any shell operating there.

Still says resouce is busy.

So trying to see what is doing it with `lsof'

However, when I run `lsof' (no arguments), it fails to produce any
output.

Just been setting there for 5-6 minutes, now.  When I know from past
use it should have produced quite a pile of output.

I tried a lsof option that is supposed to show specifically nfs
related 

 ( lsof -b /nfs/mount/point)

So trying it on the one reporting `busy'
  lsof -b /projects

Which gave a gout of output with this kind of stuff in it:

  lsof: avoiding readlink(/projects): -b was specified.
  lsof: avoiding readlink(/): -b was specified.
  lsof: avoiding stat(/): -b was specified.
  lsof: WARNING: can't stat() rootfs file system /
        Output information may be incomplete.
  lsof: avoiding readlink(/): -b was specified.
  lsof: avoiding stat(/): -b was specified.
  lsof: WARNING: can't stat() reiserfs file system /
        Output information may be incomplete.

 [...]

Anyone know what might be going on here?