Re: More about nfsd/lockd hang in 2.4.20+NFS_ALL

[Matthew Mitchell <matthew@geodev.com>]

Trond Myklebust wrote:
>>>>>>" " == Matthew Mitchell <matthew@geodev.com> writes:
> 
> 
>      > rpc.statd in this case is running as an unprivileged user, yes.
>      > So lockd will not allow a local statd to talk to it unless it
>      > is running on a privileged port?  That seems to be what is
>      > going on in the conditional.  Next question is -- why?
> 
> For obvious reasons, you don't want any Tom, Dick or Harry to be able
> to tell the kernel that it should try to recover locking state from a
> given server.

Right, it has to come from localhost on a privileged port.  I 
understand.  But how could it ever work if it's not working in this 
case?  Maybe this is a red herring.

According to rpcinfo on this server, which is also the client, port 
32769 is "sgi_fam".  What is that?  status is 32768.  Perhaps it's 
rejecting it with good cause.

>      > Even assuming there is a good reason, why might it cause the
>      > whole nfs system to hang?
> 
> My guess (since you are not supplying a tcpdump) is that the server is
> down. That's when it is supposed to happen, anyway...

Hmm.  So the messages from lockd could just be a symptom of the problem 
(nfsd locking up), you think.  I first noticed the problem when a remote 
user logged into the server, and the home directory (exported by the 
server) got remounted by the automounter on a local path.

But just now I tried manually mounting the home directories on another 
local path, and it seems to work fine.

Perhaps it involves the automounter somehow?  I did notice that the 
output of mount looked funny when I was trying to see if the volume had 
been remounted.  It was something like

fenris:/export/users on /home/users type nfs (rw,bind)

instead of

fenris:/export/users on /home/users type nfs (rw,addr=127.0.0.1)

I can try to reproduce the problem with autofs, but these are user home 
directories,  and they might get annoyed. :)

-- 
Matthew Mitchell
Systems Programmer/Administrator            matthew@geodev.com
Geophysical Development Corporation         phone 713 782 1234
1 Riverway Suite 2100, Houston, TX  77056     fax 713 782 1829



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