From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: linux-nfs-owner@vger.kernel.org Received: from mailout0.thls.bbc.co.uk ([132.185.240.35]:53460 "EHLO mailout0.thls.bbc.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750914Ab1J2AZZ (ORCPT ); Fri, 28 Oct 2011 20:25:25 -0400 Date: Sat, 29 Oct 2011 00:25:00 +0000 From: David Flynn To: Trond Myklebust Cc: David Flynn , linux-nfs@vger.kernel.org, Chuck Lever Subject: Re: NFS4ERR_STALE_CLIENTID loop Message-ID: <20111029002500.GA2011@rd.bbc.co.uk> References: <20111024104042.GD32587@rd.bbc.co.uk> <1319455367.8505.3.camel@lade.trondhjem.org> <20111024131734.GE32587@rd.bbc.co.uk> <1319463165.2734.1.camel@lade.trondhjem.org> <20111024145027.GF32587@rd.bbc.co.uk> <1319470302.2734.4.camel@lade.trondhjem.org> <20111027221742.GI32587@rd.bbc.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <20111027221742.GI32587@rd.bbc.co.uk> Sender: linux-nfs-owner@vger.kernel.org List-ID: * David Flynn (davidf@rd.bbc.co.uk) wrote: > * Trond Myklebust (Trond.Myklebust@netapp.com) wrote: > > Do you have an example of the stateid argument's value? Does it change > > at all between separate WRITE attempts? > > Further to all this, i've just had a similar fault on another machine, Using the same kernel, same mountpoint as before, we're currently experiencing a loop involving NFS4ERR_STALE_CLIENTID. Trace: ftp://ftp.kw.bbc.co.uk/davidf/priv/saesheil.pcap Unfortunately, this is resulting in about 40 nodes doing their best to kill the poor solaris server. Generating a combined total of 250Mbit/sec towards the NFS server (collecting a little under 200Mbit/sec of replies). Have we not heard of exponential backoff? This seems to require major attention, given that this amounted to a site wide DoS: going round all the machines and killing the processes that were having major problems brought the situation back under control. Frankly i'd rather that you panicked the kernel than this. Regards, ..david