> We are using autofs for mounting home directories, but are 
> experiencing two major problems wrt unmounting NFS mounts:
> 
> 1) The umount command indicates that the umount succeeded, 
> but even so, 
> the NFS export is still mounted. This can be confirmed by looking in 
> /etc/mtab and /proc/mounts. 

in other words, you are able to replicate this problem without autofs
(ie, using only static mount points)?

> Any ideas? This is a major problem for us, since it's not 
> possible to have 
> more than 800 NFS mounts or so. 

is there an error message in the kernel log?  you might try a few umount
commands while NFS or RPC trace debugging messages are enabled on your
client.

  sudo sysctl -w sunrpc.rpc_debug=32767

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