linux-kernel - Re: NFS regression? Odd delays and lockups accessing an NFS export.

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Message-Id: <1219444903.27921.65.camel@localhost.localdomain>
Date:	Fri, 22 Aug 2008 23:41:43 +0100
From:	Ian Campbell <ijc@...lion.org.uk>
To:	Trond Myklebust <trond.myklebust@....uio.no>
Cc:	John Ronciak <john.ronciak@...il.com>,
	Grant Coady <gcoady.lk@...il.com>,
	linux-kernel@...r.kernel.org, neilb@...e.de, bfields@...ldses.org,
	linux-nfs@...r.kernel.org,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	PJ Waskiewicz <peter.p.waskiewicz.jr@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	e1000-devel@...ts.sourceforge.net
Subject: Re: NFS regression? Odd delays and lockups accessing an NFS export.

On Fri, 2008-08-22 at 14:56 -0700, Trond Myklebust wrote:
> On Fri, 2008-08-22 at 22:37 +0100, Ian Campbell wrote:
> > I can ssh to the server fine. The same server also serves my NFS home
> > directory to the box I'm writing this from and I've not seen any trouble
> > with this box at all, it's a 2.6.18-xen box.
> 
> OK... Are you able to reproduce the problem reliably?

It usually happens in around a day, but I can't make it happen at will
so that I can arrange to be present at the time. It has usually locked
up over night in the past.

> If so, can you provide me with a binary tcpdump or wireshark dump? If
> using tcpdump, then please use something like
> 
>    tcpdump -w /tmp/dump.out -s 90000 host myserver.foo.bar and port 2049

I'll try leaving this going overnight but using -C and -W to limit the
size to the disk space available.

> Please also try to provide a netstat dump of the current TCP connections
> as soon as the hang occurs:
> 
>   netstat -t

Will do it ASAP after it happens.

Ian.
-- 
Ian Campbell

revision 1.17.2.7
date: 2001/05/31 21:32:44;  author: branden;  state: Exp;  lines: +1 -1
ARRRRGH!!  GOT THE G** D*** SENSE OF A F******* TEST BACKWARDS!

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