Weird behaviour 'umount' on NFS disk

[Frank Staals]

Hey,

Usually I work at my laptop, if I'm at home I can mount some directories 
from my server so I can also access those files and I don't have to ftp 
them. For the mounting I use this script :

frank at Riza$ cat /usr/local/bin/nfsmount
#!/bin/sh

srv="192.168.2.1"

if [ "$1" = "-wlan" ]; then
        srv="192.168.5.1"
fi

echo "Mounting home/net/var->/mnt/var , home->/mnt/server and
home/net/server->/mnt/series from $srv"
mount $srv:/home/net/var/ /mnt/var/
mount $srv:/home/ /mnt/server/
mount $srv:/home/net/series/ /mnt/series/
frank at Riza$

The IP adres of my server is 192.168.2.1 when using LAN and it is 
accessable at 192.168.5.1 using WLAN. It is set up allowing mounts from 
my laptop using LAN as well as WLAN. This works perfectly.

For unmounting the three NFS-mounts I use an other script which is just 
three times an 'umount' :

#!/bin/sh

umount /mnt/server
umount /mnt/series
umount /mnt/var

df -m
echo "/mnt/server , /mnt/series and /mnt/var unmounted"


frank at Riza$

Up until a week ago this worked fine. I could mount and unmount the 
directories without any problems. But then a weird error occured. When I 
tried unmounting them. The umount command hangs when trying to unmount a 
disk but when I cancel the umount ( with Ctrl  + c ) df shows that the 
disk is unmounted. It just won't give me a prompt again. The same thing 
happens when I try to unmount them manually. I can unmount a disk, but 
it just stops. To clear things up:

root at Riza# df  
Filesystem                   1K-blocks      Used    Avail Capacity  
Mounted on
/dev/ad0s1a                    4058062   3450302   283116    92%    /
devfs                                1         1        0   100%    /dev
/dev/ad0s1d                   33524236  23047782  7794516    75%    /home
192.168.2.1:/home/net/var     75685352  57816262 11814262    83%    /mnt/var
192.168.2.1:/home             52195402  29726280 18293490    62%    
/mnt/server
192.168.2.1:/home/net/series 151368706 128022780 11236430    92%    
/mnt/series
root at Riza# umount /mnt/server/
^C
root at Riza# df
Filesystem                   1K-blocks      Used    Avail Capacity  
Mounted on
/dev/ad0s1a                    4058062   3450302   283116    92%    /
devfs                                1         1        0   100%    /dev
/dev/ad0s1d                   33524236  23047782  7794516    75%    /home
192.168.2.1:/home/net/var     75685352  57816262 11814262    83%    /mnt/var
192.168.2.1:/home/net/series 151368706 128022780 11236430    92%    
/mnt/series
root at Riza#

This is quite annoying since I can't use my script to unmount the disks 
anymore. I didnt' change anything to my mounts ( /etc/fstab ) and 
unmounting a DVD doesn't give any problems. The only thing I can see has 
changed is that at boot the system hangs at:

Mounting NFS file systems:
NFS access cache time=2

and I have to ctrl + c it to continue booting, this only happend before 
when I hadn't any network connection. But mounting the nfs-disks using 
my script did work.

Anyone an Idea what I can do to fix this ? Running FreeBSD 7.0-Current 
by the way.

Thanks in advance

-- 
-Frank Staals