On Shutdown computer is locking up on samba share drive

[luna6]

I have 2 fc3 boxes. Box1 is running samba, and box2 I used webmin to mount shares from box1. When I go to reboot box2 with the mapped shared drives, during shutdown it will hang and give me this error :
Code: Bad EIP value.
/etc/rc6.d/S01reboot: line 195: 5766 Segmentation fault /sbin/fuser -k -m $sig $remaining >//dev/null
Unmounting file systems (retry): umount2evice or resource busy
umount: /home:device is busy
umount2: Device or resource busy
umount: /home:device is busy
umount2: Device or resource busy
..says same thing about other mounted drives...then goes on to say
[FAILED]
<3>arch.i386/kernal/semaphore.c:64: spin_is_locked on uninitialized spinlock 20b06ac0.
arch/i386/kernal/semaphore.c:81: spin_is_locked on uninitialized spinlock 20b06ac0

...can someone explain why this is happening? I have lost data on some of my shared samba drives in the last 2 days so this is making me think it maybe becuase of this shutdown problem. Also would someone recommend using NFS over Samab for this purpose of mounting drives on another linux box? I would like to mount and share drives on both computers to the other computer....I also have a 3rd windows box which I started off using samba, but I could just use samba to share between linux and windows, and use NFS between the two linux box if it would be more efficient/advantageous. I dont really know much about the benefits of NFS. thanks any tips / help is appreciated.

[luna6]

In webmin I had to allow for regular user to mount the drives...I guess this works the inverse and allows user to unmount the drive as well...after i checked that off...shuts down with no problems...still curious if someone could explain if NFS would be better suited for the task or samba is fine...?

[bert]

How do you mount your share ? (cifs or smbfs)
Samba version ?