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I encountered an kernel trace regarding NFS running 3.11.0-7-generic
#13-Ubuntu SMP Tue Sep 10 20:55:38 UTC 2013 x86_64 GNU/Linux under
Debian Squeeze 6.0.7 amd64 on an Opteron barebone.

This server is an NFS client using cachefilesd.

The NFS server is Debian Squeeze 6.0.7 amd64 running 3.2.0-0.bpo.4-amd64
#1 SMP Debian 3.2.46-1~bpo60+1 x86_64 GNU/Linux and nfs-kernel-server on
an Opteron barebone.

No kerberos is in use.

To get things up and running for 700+ user ids, i configured the
following on the client, using trial and error, to have the correct user
ids on the NFS mount:

echo N > /sys/module/nfs/parameters/nfs4_disable_idmapping
kernel.keys.root_maxbytes = 100000
kernel.keys.root_maxkeys = 1000
kernel.keys.maxbytes = 100000
kernel.keys.maxkeys = 1000

The trace is attached.

Thanks,
Raoul

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

-- 
WARNING: CPU: 2 PID: 24776 at /build/buildd/linux-3.11.0/fs/nfs/idmap.c:660 nfs_idmap_legacy_upcall+0x195/0x1b0 [nfsv4]()
https://bugs.launchpad.net/bugs/1225494
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