On Thu, 30 Jun 2016 18:30:42 +0000
Trond Myklebust [off-list ref] wrote:

Wait. So the NFS mount is still active, it’s just that the socket
disconnected due to no traffic? That should be OK. Granted that the
port can’t be reused by another process, but you really don’t want
that: what if there are no other ports available and you start
writing to a file on the NFS partition?

What would cause the port to be connected to a socket again? I copied a
large file to the nfs mount, and the hidden port is still there?

Remember, this wasn't always the case, the hidden port is a recent
issue.

I ran wireshark on this and it appears to create two ports for NFS. One
of them is canceled by the client (sends a FIN/ACK) and this port is
what lays around never to be used again, and uses the other port for
all connections after that.

When I unmount the NFS directory, the port is finally freed (but has no
socket attached to it). What is the purpose of keeping this port around?

I can reproduce this by having the client unmount and remount the
directory.

-- Steve
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