netdev - Re: [REGRESSION] NFS is creating a hidden port (left over from xs

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Date:	Fri, 19 Jun 2015 17:50:02 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Trond Myklebust <trond.myklebust@...marydata.com>
Cc:	Jeff Layton <jlayton@...chiereds.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Anna Schumaker <anna.schumaker@...app.com>,
	Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
	Linux Network Devel Mailing List <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bruce James Fields <bfields@...ldses.org>
Subject: Re: [REGRESSION] NFS is creating a hidden port (left over from
 xs_bind() )

On Fri, 19 Jun 2015 13:39:08 -0400
Trond Myklebust <trond.myklebust@...marydata.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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