Re: [PATCH 0/3] NFS regression in 2.6.26?, "task blocked for more than 120 seconds"

[Kasparek Tomas <kasparek@fit.vutbr.cz>]

On Fri, Jan 09, 2009 at 12:59:26PM -0500, Trond Myklebust wrote:
> On Fri, 2009-01-09 at 15:56 +0100, Kasparek Tomas wrote:
> > On Tue, Dec 23, 2008 at 05:34:07PM -0500, Trond Myklebust wrote:
> > > On Tue, 2008-12-16 at 13:05 +0100, Kasparek Tomas wrote:
> > > > Hm, not happy to say that but it still does not work after some time. Now
> > > > the problem is opposite there are no connections to the server according to
> > > > netstat on client, just time to time there is
> > > > 
> > > > pcnlp1.fit.vutbr.cz.15234 > kazi.fit.vutbr.cz.nfs: 40 null
> > > > kazi.fit.vutbr.cz.nfs > pcnlp1.fit.vutbr.cz.15234: reply ok 24 null
> > > > 
> > > > (kazi is server). Will try to investigate more details.
> > > 
> > > OK. Here is one more try. I've tightened up some locking issues with the
> > > previous patch.
> > 
> > Did tried this new version. Applied it to 2.6.27.10, but the behaviour is
> > the same like with the first version - when old mounts are removed by amd
> > new one are not created, fter a while, there are no sockets on the client
> > and just CLOSED sockets on server. Client is issuing null RPC checks each
> > 30sec and they are OK, but no other communication between client and server
> > takes place.
> > 
> > 15:45:41.238796 IP pcnlp1.897490 > kazi.nfs: 40 null
> > 15:45:41.239009 IP kazi.nfs > pcnlp1.897490: reply ok 24 null
> > 
> > 
> > I will try to get more info, but if you have some idea where to look or
> > what to try, it will be helpful.
> > 
> > Thanks for your help
> 
> Wait. You're using amd when testing? Could you please rather retry using
> just a static mount? amd has historically had way too many bugs
> (particularly w.r.t. tcp) to be considered a reliable test.

Will try, but with static mount there is one stable TCP connection between
client and server so this problem can not happen at all isn't it? 

--   

  Tomas Kasparek, PhD student  E-mail: kasparek@fit.vutbr.cz
  CVT FIT VUT Brno, L127       Web:    http://www.fit.vutbr.cz/~kasparek
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  Brno, Czech Republic         Phone:  +420 54114-1220

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