Date:	Mon, 11 May 2009 12:39:18 -0400
From:	Chuck Lever <chuck.lever@...cle.com>
To:	Frans Pop <elendil@...net.nl>
Cc:	Netdev <netdev@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	Linux NFS mailing list <linux-nfs@...r.kernel.org>
Subject: Re: svc: failed to register lockdv1 RPC service (errno 97).

On May 11, 2009, at 10:39 AM, Frans Pop wrote:
> On Monday 11 May 2009, you wrote:
>> On May 10, 2009, at 8:48 PM, Frans Pop wrote:
>>> After switching from 2.6.29.2 to 2.6.30-rc5 I get this new message
>>> during boot of my home server:
>>>  svc: failed to register lockdv1 RPC service (errno 97).
>>
>> Is this the only instance of this message, or do you see it several
>> times?
>
> It's the only one.
>
>>> This looks to be the result of the following commit:
>>> commit 363f724cdd3d2ae554e261be995abdeb15f7bdd9
>>> Author: Chuck Lever <chuck.lever@...cle.com>
>>>   SUNRPC: rpcb_register() should handle errors silently
>>>   Move error reporting for RPC registration to rpcb_register's
>>> caller.
>>>
>>> Question is: do I really want to know this? I assume the "failure"
>>> happened with previous kernels too, but silently.
>>
>> The point of that commit was to report errors _less_ frequently.
>
> :-)
>
>> The server-side RPC code is attempting to be more automatic about
>> which address families are supported by kernel NFS services.  This
>> message tells us that some particular case is not handled yet.  I
>> suspect you weren't seeing this error in the past at all.
>
> Correct. Neither this exact error, nor anything remotely similar.

No, I meant that whether or not you saw an error message, the  
underlying condition probably was not occurring before 2.6.30.

>> Can you report more about your server configuration?  What
>> distribution is this?
>
> Debian stable (Lenny).
> nfs-common and nfs-kernel-server (1.1.2)
>
> I'm using nfs4. rpc.statd is not running; rpc.mountd and rpc.idmapd  
> are.

The NFS client and server appear to start lockd listeners for NFSv4.   
They probably don't need to.  But that's a separate issue.

>> Does user space have portmapper or rpcbind?
>
> portmap (6.0)
>
>> Are you blacklisting ipv6.ko?
>
> No, the server has IPv6 enabled.
> I'm using NFS mainly from my laptop though, which does not have an  
> IPv6
> address for my home network.
>
>> What's the output of "rpcinfo" on your server after it has started  
>> NFSD?
>
> I guess you mean the -p option?
>
> $ rpcinfo -p
>   program vers proto   port
>    100000    2   tcp    111  portmapper
>    100000    2   udp    111  portmapper
>    100003    2   udp   2049  nfs
>    100003    3   udp   2049  nfs
>    100003    4   udp   2049  nfs
>    100021    1   udp  47955  nlockmgr
>    100021    3   udp  47955  nlockmgr
>    100021    4   udp  47955  nlockmgr
>    100021    1   tcp  41860  nlockmgr
>    100021    3   tcp  41860  nlockmgr
>    100021    4   tcp  41860  nlockmgr
>    100003    2   tcp   2049  nfs
>    100003    3   tcp   2049  nfs
>    100003    4   tcp   2049  nfs
>    100005    1   udp  40032  mountd
>    100005    1   tcp  40623  mountd
>    100005    2   udp  40032  mountd
>    100005    2   tcp  40623  mountd
>    100005    3   udp  40032  mountd
>    100005    3   tcp  40623  mountd
>    391002    2   tcp    792  sgi_fam

In this case, it looks like the message can be treated as a notice.  I  
think in general we could safely make that a dprintk, but I'd like to  
wait a bit more to see if we catch any bad behavior.

--
Chuck Lever
chuck[dot]lever[at]oracle[dot]com
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