NFS state manager thread reaping expired delegations looping for too long or indefinitely

Solution In Progress - Updated -

Issue

NFS client appears to slow down significantly almost to a hang. Access to NFS mounted filesystem(s) is practically in a hang situation.

It has been observed that when symptoms are present, one or more nfs state manager threads named like [-ma] stick around, sometimes for hours consuming many CPU resources.

Environment

  • Red Hat Enterprise Linux 8 and 9
  • NFS version 4
  • delegations enabled

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