problems with chown as root on nfs4 export

I=92ve posted this same email to the linux NFS mailing list since I think i=
t might be client-side problem, but thought I might look for input here as =
well.

problem: when using chown as root on a nfs4 filesystem on newer linux relea=
ses file owners get sets to nobody.
        the user type doesn=92t seem to matter (/etc/passwd, LDAP, Samba4)

setup: Server is FreeBSD 10 system with NFSv4 share.
      Server and clients are all configured with the same idmap domain
      Network users have consistent uid/gid on server and clients
      clients with older linux releases work OK (Ubuntu 12.04, CentOS 5 and=
 6)
      clients with newer linux releases do not work ( Fedora 20, Ubuntu 14.=
04, Mint 16 )

clues:

1. working and non-working systems get to the same fchownat() system call w=
ith the same arguments (via strace).

example (identical on working and non-working client):
....
fchownat(AT_FDCWD, "/mnt/test", 11111, 4294967295, 0) =3D 0
close(1)                                =3D 0
close(2)                                =3D 0
close(4)                                =3D 0
exit_group(0)                           =3D ?
+++ exited with 0 +++

2. working system sends NFSV4 SETATTR request with owner set to: matlab@nim=
gs.com and non-working as 11111 (via wireshark)



3. I can=92t rule out misconfiguration.  but I=92ve configured as identical=
ly as I could, and tried a lot of small vairations. these are my current se=
ttings (the pipefs settings are the distro defaults)

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