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CONTAP-663716: ONTAP cluster node reboots unexpectedly during UDP socket teardown

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Issue

An ONTAP node reboots unexpectedly and its high-availability partner takes over its storage. The event is logged with the following message:

downgrade of a recursed lock in process cg_thread0

The node generates a core file, reboots, and returns to service after giveback. Client sessions served by the affected node are interrupted for the duration of the takeover and giveback. In the reported occurrence the node was processing UDP traffic for the NetBIOS name service when the disruption occurred.

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