klibc's nfsmount failure with 2.6.27.21, while 2.6.25.20 was fine

["Hans-Peter Jansen" <hpj-2x7n3sizJbFeoWH0uzbU5w@public.gmane.org>]

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Hi,

I suffer from a problem, where my diskless environment doesn't work anymore 
after upgrading the server from openSUSE 11.0 (2.6.25.20) to openSUSE 11.1 
(2.6.27.21).

The diskless environment gets set up with an customized initrd via pxelinux.
The initrd uses klibc's nfsmount, and I've tried both protocols: udp and 
tcp. It's not an iptables issue, since I can mount these directories from 
other (fully booted) systems just fine. 

Using the debug version of klibc's nfsmount prints these messages:
short read: 0 < 28
Port for 100003/3[udp]: 0
short read: 0 < 28
Port for 100005/3[udp]: 0
NFS params:
  server = xxx.xx.xx.xx, path = "/roroot", version = 3, proto = udp,
  mount_port = 627, nfs_port = 2049, flags = 00010282,
  rsize = 0, wsize = 0, timeo = 7, retrans = 3,
  acreg (min,max) = (3,60), acdir (min,max) = (30,60),
  soft = 0, intr = 1, posix = 0, nocto = 0, noac = 0

tcpdumping the communication shows, that for whatever reason, the client 
sends the mount request from source port 798 to destination port 627, but 
the server doesn't listen on 627:
# rpcinfo -p
   program vers proto   port  service
    100000    4   tcp    111  portmapper
    100000    3   tcp    111  portmapper
    100000    2   tcp    111  portmapper
    100000    4   udp    111  portmapper
    100000    3   udp    111  portmapper
    100000    2   udp    111  portmapper
    100005    1   udp  41656  mountd
    100005    1   tcp  49063  mountd
    100005    2   udp  41656  mountd
    100005    2   tcp  49063  mountd
    100005    3   udp  41656  mountd
    100005    3   tcp  49063  mountd
    100003    2   udp   2049  nfs
    100003    3   udp   2049  nfs
    100003    4   udp   2049  nfs
    100021    1   udp  33144  nlockmgr
    100021    3   udp  33144  nlockmgr
    100021    4   udp  33144  nlockmgr
    100003    2   tcp   2049  nfs
    100003    3   tcp   2049  nfs
    100003    4   tcp   2049  nfs
    100021    1   tcp  57268  nlockmgr
    100021    3   tcp  57268  nlockmgr
    100021    4   tcp  57268  nlockmgr
    100024    1   udp  39508  status
    100024    1   tcp  45430  status


I've attached the relevant tcpdump section.

I would be very grateful, if some kind soul could enlight me here, as I'm 
fully puzzled..

Pete

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