running:
sudo sysctl kernel.keys.root_maxkeys=1000
sudo sysctl kernel.keys.maxkeys=1000

fixes the issue for me to some extent. I still have some files with
4294967294 instead of nobody or nogroup.

I only see the problem on one ldap and nfsv4 client running ubuntu 14.04
LTS (as a testbed). My other servers are running 12.04 and don't have
the issue. They don't seem to be using these keys at all. Is idmaping
enabled by default on 14.04 where it wasn't in 12.04?

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https://bugs.launchpad.net/bugs/1124250

Title:
  Partially incorrect uid mapping with nfs4/idmapd/ldap-auth

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