From: Jan Kasprzak <kas@fi.muni.cz>
Subject: mountd gives "illegal port"
Date: Wed, 27 Oct 2004 14:42:28 +0200
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	Hi all,

I have discovered the following problem in Linux NFS: When you mount
many filesystems from the same server, mountd sometimes refuses the
request with "illegal port" message in syslog. To reproduce this, I did
the following:

On the NFS server:
# for i in `seq 1 2048`; do mkdir /tmp/nfs/$i; echo "$i" >/tmp/nfs/$i/index-$i.txt; echo "/tmp/nfs/$i    *.fi.muni.cz(ro)"; done >/etc/exports
# exportfs -a

On the NFS client;
# for i in `seq 1 2048`; do mkdir /tmp/nfs/$i; done
# for i in `seq 1 100`; do echo $i; mount -t nfs -r nfs-server:/tmp/nfs/$i /tmp/nfs/$i || break; done

It fails after random number of iterations (seen 6 to 57) with

mount: nfs-server:/tmp/nfs/6 failed, reason given by server: Permission denied

And in NFS server the following is added to syslog:

Oct 27 14:28:48 nfs-server rpc.mountd: refused mount request from nfs-client.fi.muni.cz for /tmp/nfs/6 (/tmp/nfs/6): illegal port 54071

The situation seems a bit better when you add "sleep 5" to the mount loop.
Sleep 2 does not help, though.

-Yenya

-- 
| Jan "Yenya" Kasprzak  <kas at {fi.muni.cz - work | yenya.net - private}> |
| GPG: ID 1024/D3498839      Fingerprint 0D99A7FB206605D7 8B35FCDE05B18A5E |
| http://www.fi.muni.cz/~kas/   Czech Linux Homepage: http://www.linux.cz/ |
> Whatever the Java applications and desktop dances may lead to, Unix will <
> still be pushing the packets around for a quite a while.      --Rob Pike <


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