NFS remove operations taking a long time and tripping hung_task backtraces and/or hung_task panics

Solution Verified - Updated -

Issue

  • experiencing hung_task panics or in general slow NFS remove operations
  • removing a NFS file is slow with NetApp NFS server

Environment

  • Red Hat Enterprise Linux (NFS client)
  • seen with NetApp filer (NFS server) and large file removes

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