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CONTAP-739621: Possible INPCB Leak Preventing UDP Socket Creation

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Issue

ONTAP 9.16.1X may experience problems a severe networking failure that caused the cluster to become partially unreachable and resulted in multiple down LIFs. Internal networking operations such as port status queries, LIF migration, and IP removal failed because the system was unable to create new UDP sockets.
System logs showed repeated socket creation failures returning ENOBUFS (error 55).
[kern_vifmgr:info:11798] [0x80b45cc00] [vifmgr_virtual_interface_iterator::get_imp] Failed to successfully calculate operational status: Unexpected error "NbladeWriter PCP RPC Error noSocket" encountered as result of getting link status for port(s).
2026-04-21T18:21:18Z 10034467026364183 [48:0] L3_NET_CONFIG_ERR: fbsd_socreate_wrapper: error: 55

Core analysis confirmed that the global udp_inpcb UMA zone had become exhausted, preventing additional UDP PCB allocations required for socket creation.
As the condition worsened, critical internal communication paths failed, leading to cluster instability and service disruption.

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