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'nfs: server not responding' due to Crowdstrike Falcon Sensor running on NFS client host

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Category:
ontap-9
Specialty:
nas
Last Updated:

Applies to

  • ONTAP 9
  • NFS
  • Crowdstrike Falcon Sensor

Issue

  • Intermittent NFS latency/unresponsiveness e.g. df -h hangs indefinitely
  • Client logs nfs: server not responding

    • Nov 24 11:36:05 client_hostname kernel: nfs: server nfs_server not responding, still trying
      Nov 24 11:36:05 client_hostname kernel: nfs: server nfs_server OK
      Nov 24 11:36:05 client_hostname kernel: nfs: server nfs_server OK
      Nov 24 11:36:05 client_hostname kernel: nfs: server nfs_server OK
      Nov 24 11:36:05 client_hostname kernel: nfs: server nfs_server not responding, still trying
      Nov 24 11:36:05 client_hostname kernel: nfs: server nfs_server OK
      Nov 24 11:36:05 client_hostname kernel: nfs: server nfs_server not responding, still trying
      Nov 24 11:36:05 client_hostname kernel: nfs: server nfs_server not responding, still trying
      Nov 24 11:36:05 client_hostname kernel: nfs: server nfs_server not responding, still trying
      Nov 24 11:36:05 client_hostname kernel: nfs: server nfs_server not responding, still trying

  • P​​​​​​acket trace shows that

    • ONTAP responds to all requests

    • ONTAP repeatedly sends TCP Retransmissions, gets no response, and closes the TCP session with [RST, ACK]

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