NetApp NFS server running Ontap 9.2 incorrectly responds to LOCKU with NFS4ERR_BAD_SEQID (10026) and 'bad sequence-id' errors seen in messages file on Linux NFS client

Solution In Progress - Updated -

Issue

  • We upgraded our NetApp filer to Ontap 9.2 and are now seeing a lot of bad sequence-id error on an unconfirmed sequence messages. A tcpdump shows LOCKU can get a response of NFS4ERR_BAD_SEQID (10026) and after that, RELEASE_LOCKOWNER gets a response of NFS4ERR_LOCKS_HELD (10037).

Environment

  • NetApp NFS server
    • seen on Ontap 9.2
  • Red Hat NFS client
    • seen on RHEL6.9 (kernel-2.6.32-696.10.3.el6)
  • NFS4

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