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Topic Status: Some information in this topic is preview and subject to change in future releases. Preview information describes new features or changes to existing features in Microsoft SQL Server 2016 Community Technology Preview 2 (CTP2).

Product Name

SQL Server

Event ID


Event Source




Symbolic Name


Message Text

IO Completion Listener (0x%lx) Worker 0x%p appears to be non-yielding on Node %ld. Approx CPU Used: kernel %I64d ms, user %I64d ms, Interval: %I64d.

Indicates that there is a possible problem with the I/O Completion Port Listener on the specified node when executing the I/O Completion routine for a network read/write event. This error will go away when the I/O Completion Port Listener returns from executing the I/O Completion routine.

Contact Microsoft Customer Support Services (CSS).

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