Strange NFS(D) behaviour

[tvrtko . ursulin]

Hello to everyone, and apologies to the ones I didn't have to CC!

I am experiencing a strange behaviour in a interaction of kernel 2.6.8.1 
(2.6.9 also tested) and util-linux 2.12c. It is 100% reproducable.

The setup:

Reboot.

start portmapper
start nfsserver (kernel one)

cat /etc/exports
/test   127.0.0.1(rw,all_squash,async)

ls -ld /test
drwxr-xr-x 3 root root 96 2004-12-06 14:59 /test

ls -l /test
total 4
-rw-r--r-- 1 root root 11 2004-12-06 14:59 a
drwxr-xr-x 2 root root 48 2004-12-06 14:59 mnt

cd /test
mount localhost:/test mnt
find
umount mnt
umount: /test/mnt: device is busy
umount: /test/mnt: device is busy
umount -l mnt (ok)
mount localhost:/test mnt
find
umount mnt (ok)

And it is now impossible to get -EBUSY on umount. Also, before the first 
umount -l mnt invocation, it is impossible to un-mount mnt without 
specifying "-l" no matter how long I wait, or how much I try.

I found this strange, the behavior should be consistent, no?



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