RHEL8: FS-Cache Duplicate cookie detected in system logs

Solution Verified - Updated -

Issue

  • Mounting NFS shares with the same parent dentry triggers FS-Cache: Duplicate cookie detected to be logged.
  • Automounted home directories are causing duplicate cookie entries to be logged.

Environment

  • Red Hat Enterprise Linux 8 (NFS client)

    • mounting multiple exports from the same server that has higher versions of NFSv4 disabled
      OR
    • mounting multiple exports from same server but using explicitly different NFS4 versions (i.e. -o vers=4.1, and vers=4.0)
  • Any NFS server with multiple exports with higher versions of NFS4 disabled

    • Example (Red Hat NFS server)

      # grep vers4 /etc/nfs.conf
      # vers4=y
      vers4.0=y
      vers4.1=n
      vers4.2=n
      
      # cat /proc/fs/nfsd/versions 
      -2 +3 +4 -4.1 -4.2
      

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