Thanks for taking the time to look at this, and sorry to have missed
that my BIOS was out of date. I have now flashed the new version and
running the commands as you propose gives the following output:

nick@serv2:~$ sudo dmidecode -s bios-version && sudo dmidecode -s 
bios-release-date
[sudo] password for nick: 
P1.40
07/23/2015

Also, I confirm that updating the  BIOS has not solved the problem.

If I understand your question correctly, you are asking for how the bug
manifests itself? If so, I have the following two files set up on my MAC
to allow me to automount the share:

beethoven:etc nick$ cat auto_master
#
# Automounter master map
#
+auto_master            # Use directory service
/net                    -hosts          -nobrowse,hidefromfinder,nosuid
/home                   auto_home       -nobrowse,hidefromfinder
/Network/Servers        -fstab
/-                      -static
/-      auto_nfs        -nobrowse,nosuid

and

beethoven:etc nick$ cat auto_nfs
/../Volumes/share       -fstype=nfs,noresvport  nfs://serv2_local:/export/share

Note for completeness, serv2_local is defined in my /etc/hosts file:
beethoven:etc nick$ cat /etc/hosts
##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting.  Do not change this entry.
##
127.0.0.1       localhost
255.255.255.255 broadcasthost
::1             localhost 
fe80::1%lo0     localhost
192.168.2.4     serv2_local

(and that I have a good connection to it:
beethoven:etc nick$ ping serv2_local
PING serv2_local (192.168.2.4): 56 data bytes
64 bytes from 192.168.2.4: icmp_seq=0 ttl=64 time=4.572 ms

The use of /../Volumes/share is a trick to make OSX automount in the
/Volumes directory. I have tested using /mnt/share and get the same
error.

serv2_local is also correctly exporting the nfs shares:
beethoven:etc nick$ showmount -e serv2_local
Exports list on serv2_local:
/export/pvr                         192.168.2.0/24
/export/share                       192.168.2.0/24
/export/home                        192.168.2.0/24
/export                             192.168.2.0/24

(note that the MAC I am using has IP address 192.168.2.42 so it should
be able to access the export)

When I try to access the shared directory, I get the following:
beethoven:Volumes nick$ cd /Volumes
beethoven:Volumes nick$ ls -lh
total 10
lrwxr-xr-x  1 root  admin     1B 24 Oct 17:13 Macintosh HD -> /
dr-xr-xr-x  2 root  wheel     1B 24 Oct 17:13 share
beethoven:Volumes nick$ cd share
-bash: cd: share: No such file or directory


If I boot the Ubuntu server with the pervious kernel version, I am able to 
access the NFS share normally.

Thanks for taking your time to look at this -- let me know if you need
more information.



** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1509666

Title:
  I cannot mount nfs shares from osx when using the new kernel

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