From mboxrd@z Thu Jan  1 00:00:00 1970
From: Trond Myklebust <trond.myklebust@fys.uio.no>
Subject: Re: [NFS] OpenSRS blog post alludes to a Linux NFS bug in 2.6.19
Date: Sun, 19 Oct 2008 12:45:01 -0400
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Cc: Yusuf Goolamabbas <yusufg-lA0CmJ9G6+FWk0Htik3J/w@public.gmane.org>, linux-nfs@vger.kernel.org
To: Jeff Layton <jlayton@redhat.com>
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On Sun, 2008-10-19 at 06:44 -0400, Jeff Layton wrote:
> On Sun, 19 Oct 2008 11:28:11 +0800
> Yusuf Goolamabbas <yusufg-lA0CmJ9G6+FWk0Htik3J/w@public.gmane.org> wrote:
> 
> > Anybody know if this is bug is fixed and if so in which kernel revision.
> > Any ideas about its impact on vendor kernels (RHEL/SUSE Enterprise)
> > 
> > http://opensrs.com/blog/2008/10/technical-debrief-on-october-cluster-a-email-service-issue/
> > 
> 
> I know that more recent RHEL kernels have this fixed. The bug to track it was here:
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=369561
> 
> It's also easy to tell if you have a kernel with this problem. Just do
> a single TCP mount on the client, and then run:
> 
> $ rpcinfo -p
> 
> ...you should see port registrations for nlockmgr. If you don't see any
> UDP ones, then the kernel has the problem.
> 

Note that the workaround was simply to add 

     lockd.nlm_udpport=<unused portnumber>

to your kernel bootparameters.

Cheers
  Trond