[ale] invisible mounting points on RHEL 5.1

[Jerry Yu]

On a stock RHEL 5.1 server, an ext3 fs image (i1) is mounted as loopback at
/mnt/m1. /mnt/m1 is exported as NFS share to be used by a RHEL 5.1 client.

Not sure since when, on the NFS server,

   - one can not see m1 when ls /mnt anymore.   Meanwhile,
   - 'cd /mnt/m1' and 'ls /mnt/m1' and  file creation under /mnt/m1 all work
   just fine under /mnt/m1.
   - mkdir /mnt/m1 fails saying '/mnt/m1 is present'
   - /proc/mounts still have /mnt/m1 listed as mounted loopback.
   - umounting /mnt/m1 & mounting it back works just fine.  still cannot see
   'm1' under /mnt.
   - /mnt/m1 is under constant use by the NFS clients, so 'rm -rf' or
   'umount' of /mnt/m1 from the server actually fails.
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