NFS 'readdir loop' error on JFS

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Jonathan McDowell and Karl Schmidt reported that when sharing a JFS
filesystem through NFS and Samba, NFS clients can report 'readdir loop'
and the directories in question then appear to have duplicate entries on
the client system.

This was seen with Linux 3.2 on the server and client.  The JFS
directory code is basically unchanged since then, but NFS has changed
somewhat.

The original bug reports were:
http://bugs.debian.org/685407#85
http://bugs.debian.org/714974

The log messages are:
[593351.877678] NFS: directory fs/nfsd contains a readdir loop.Please contact your server vendor.  The file: .nfs3proc.o.cmda.com has duplicate cookie 73
[593351.904689] NFS: directory fs/nfsd contains a readdir loop.Please contact your server vendor.  The file: .nfs3proc.o.cmda.com has duplicate cookie 73
[280774.570555] NFS: directory //accounting contains a readdir loop.Please contact your server vendor.  The file: .~lock.credit.rtf1.rtf# has duplicate cookie 199

Is this likely to be a problem with JFS, the NFS client or server?  Can
anyone suggest how to investigate this further?

Ben.

-- 
Ben Hutchings
It is easier to write an incorrect program than to understand a correct one.

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