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[Justin Fletcher <jfletcher@xxxxxxxxxxx>]

"We have an NFS server running on a RedHat system."
... which we access through an Ubuntu 12.04 LTS system. It is on this system that the NFS client problems occur.

Sorry, that wasn't especially clear :-(

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https://bugs.launchpad.net/bugs/1240143

Title:
  NFS client reports a 'readdir loop' with a corrupt name

Status in “linux” package in Ubuntu:
  New

Bug description:
  We have an NFS server running on a RedHat system. One particular
  directory contains many, many RPMs (96850). It reports that there is a
  'readdir loop',  and the loop in question contains corrupted names. I
  assume the name corruption is happening on the Linux kernel end, not
  the server end:

  "NFS: directory Development/rpms contains a readdir loop.Please contact your server vendor.  The file: foo-bar-11.0flange-12345.AB5.x86_64.rpmmpmpmmT53 has duplicate cookie 1110018804"
  "NFS: directory Development/rpms contains a readdir loop.Please contact your server vendor.  The file: widget-wiggle-11.0-12356.AB5.x86_64.rpmpm.AB5.x86_64.rpm\xffffffffm has duplicate cookie 353422206"

  Since the corrupted names are never displayed in an 'ls' of the
  directory (even whilst the problem is occurring), I assume that this
  is a presentation problem in the warning message.

  Unfortunately the problem had gone away by the time I tried using
  tcpdump to capture the on-the-wire data.

  jfletcher@gromit:~$ cat /proc/version
  Linux version 3.2.0-29-generic (buildd@allspice) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #46-Ubuntu SMP Fri Jul 27 17:03:23 UTC 2012
  jfletcher@gromit:~$ lsb_release -rd
  Description:	Ubuntu 12.04.3 LTS
  Release:	12.04

  
  The lspci information would not be useful - the system was running under KVM, with a single interface.

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