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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

*** This bug is a duplicate of bug 1225494 ***
    https://bugs.launchpad.net/bugs/1225494

** This bug has been marked a duplicate of bug 1225494
   WARNING: CPU: 2 PID: 24776 at /build/buildd/linux-3.11.0/fs/nfs/idmap.c:660 nfs_idmap_legacy_upcall+0x195/0x1b0 [nfsv4]()

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https://bugs.launchpad.net/bugs/1225490

Title:
  BUG: unable to handle kernel paging request at 0000000100000000

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I encountered an kernel oops 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

  I was capturing the trace via an SSH session using tail -f so some
  information might be missing :-/ (attached)

  Thanks,
  Raoul

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