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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1225494

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

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

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https://bugs.launchpad.net/bugs/1225494

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

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  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

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