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Cisco Bug: CSCvu29498 - Multiple UCS VIC may log "hang_notify" error on no-drop VNIC after CATERR on one Server/Node

Last Modified

Oct 13, 2020

Products (1)

  • Cisco Unified Computing System

Known Affected Releases


Description (partial)

Multiple UCS Virtual Interface Adapters may log "mcp.hang_notify ERROR: vnicX: hang_notify" messages and I/O will halt

Host OS such as VMWare may log errors such as the following:
nenic: enic_uplink_reset:3100: [0000:3f:00.3] Resetting
cpu5:65693)WARNING: nenic: enic_uplink_tq_stop:264: [0000:3f:00.3] Failed to stop TX queue 0. Already stopped

Issue has been observed to occur when
No Drop Ethernet class, such as Platinum is configured with significant server to server traffic
Hardware related error, such as a CATERR has occurred on one server in a cluster
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Bug Details Include

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