Date: Fri, 19 Jun 2015 17:50:02 -0400
From: Steven Rostedt <rostedt@goodmis.org>
To: Trond Myklebust <trond.myklebust@primarydata.com>
Cc: Jeff Layton <jlayton@poochiereds.net>,
        Eric Dumazet <eric.dumazet@gmail.com>,
        Anna Schumaker <anna.schumaker@netapp.com>,
        Linux NFS Mailing List <linux-nfs@vger.kernel.org>,
        Linux Network Devel Mailing List <netdev@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Bruce James Fields <bfields@fieldses.org>
Subject: Re: [REGRESSION] NFS is creating a hidden port (left over from
 xs_bind() )
Message-ID: <20150619175002.17a231b1@gandalf.local.home>
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On Fri, 19 Jun 2015 13:39:08 -0400
Trond Myklebust <trond.myklebust@primarydata.com> wrote:


> Hang on. This is on the client box while there is an active NFSv4
> mount? Then that's probably the NFSv4 callback channel listening for
> delegation callbacks.
> 
> Can you please try:
> 
> echo "options nfs callback_tcpport=4048" > /etc/modprobe.d/nfs-local.conf
> 
> and then either reboot the client or unload and then reload the nfs
> modules before reattempting the mount. If this is indeed the callback
> channel, then that will move your phantom listener to port 4048...

I unmounted the directories, removed the nfs modules, and then add this
file, and loaded the modules back and remounted the directories.

# netstat -ntap |grep 4048
tcp        0      0 0.0.0.0:4048            0.0.0.0:*               LISTEN      -               
tcp        0      0 192.168.23.22:4048      192.168.23.9:1010       ESTABLISHED -               
tcp6       0      0 :::4048                 :::*                    LISTEN      -               

-- Steve

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