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

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Date:	Thu, 18 Jun 2015 15:49:14 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Trond Myklebust <trond.myklebust@...marydata.com>
Cc:	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>
Subject: Re: [REGRESSION] NFS is creating a hidden port (left over from
 xs_bind() )

On Thu, 18 Jun 2015 15:24:52 -0400
Trond Myklebust <trond.myklebust@...marydata.com> wrote:

> On Wed, Jun 17, 2015 at 11:08 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> > On Fri, 12 Jun 2015 11:50:38 -0400
> > Steven Rostedt <rostedt@...dmis.org> wrote:
> >
> >> I reverted the following commits:
> >>
> >> c627d31ba0696cbd829437af2be2f2dee3546b1e
> >> 9e2b9f37760e129cee053cc7b6e7288acc2a7134
> >> caf4ccd4e88cf2795c927834bc488c8321437586
> >>
> >> And the issue goes away. That is, I watched the port go from
> >> ESTABLISHED to TIME_WAIT, and then gone, and theirs no hidden port.
> >>
> >> In fact, I watched the port with my portlist.c module, and it
> >> disappeared there too when it entered the TIME_WAIT state.
> >>
> 
> I've scanned those commits again and again, and I'm not seeing how we
> could be introducing a socket leak there. The only suspect I can see
> would be the NFS swap bugs that Jeff fixed a few weeks ago. Are you
> using NFS swap?

Not that I'm aware of.

> 
> > I've been running v4.0.5 with the above commits reverted for 5 days
> > now, and there's still no hidden port appearing.
> >
> > What's the status on this? Should those commits be reverted or is there
> > another solution to this bug?
> >
> 
> I'm trying to reproduce, but I've had no luck yet.

It seems to happen with the connection to my wife's machine, and that
is where my wife's box connects two directories via nfs:

This is what's in my wife's /etc/fstab directory

goliath:/home/upload     /upload         nfs     auto,rw,intr,soft       0 0
goliath:/home/gallery    /gallery        nfs     auto,ro,intr,soft	 0 0

And here's what's in my /etc/exports directory

/home/upload       wife(no_root_squash,no_all_squash,rw,sync,no_subtree_check)
/home/gallery      192.168.23.0/24(ro,sync,no_subtree_check)

Attached is my config.

-- Steve



Download attachment "config.gz" of type "application/gzip" (40609 bytes)