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

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Message-Id: <1219428489.6919.21.camel@localhost>
Date:	Fri, 22 Aug 2008 11:08:09 -0700
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Ian Campbell <ijc@...lion.org.uk>
Cc:	Grant Coady <gcoady.lk@...il.com>, linux-kernel@...r.kernel.org,
	neilb@...e.de, bfields@...ldses.org, linux-nfs@...r.kernel.org
Subject: Re: NFS regression?  Odd delays and lockups accessing an NFS
	export.

On Fri, 2008-08-22 at 11:23 +0100, Ian Campbell wrote:
> On Mon, 2008-08-18 at 15:20 -0400, Trond Myklebust wrote:
> > Please try to reproduce the hang, then do
> > 
> > 	echo 0 >/proc/sys/sunrpc/rpc_debug
> > 
> > and send the output from 'dmesg'...
> 
> I've also been seeing some NFS related lockups, although I'm not sure if
> they are the same as the one in this thread or not. Client is 2.6.26
> (Debian's kernel) and Server is 2.6.25 (also a Debian kernel, but from
> backports.org).
> 
> rpc_debug on the server gives nothing, on the client gives:
> [144741.637997] -pid- proc flgs status -client- -prog- --rqstp- -timeout -rpcwait -action- ---ops--
> [144741.637997]  3439 0004 0080    -11 f3f48200 100003 f7770000        0 xprt_sending fa0ae88e fa0bddf4
> [144741.637997]  3438 0001 00a0      0 f77f2a00 100003 f77700d0    15000 xprt_pending fa0ae88e fa0bddf4

That's probably also a networking device driver issue candidate: your
RPC task is queued up waiting to be sent.

What networking card+device driver are you using here?

> There are no processes running with pid 3439 3438 (I don't think it's
> that sort of pid though).

The 'pid' is an internal RPC cookie that just serves to identify and
track specific RPC requests.

Cheers
  Trond

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