NTSTATUS 0xC0350014 (STATUS_HV_NOT_ACKNOWLEDGED): meaning

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Description:

A previous Hyper-V virtual interrupt remains unacknowledged, so the next operation cannot proceed.

Could be also:
Constant	Type	OS
ERROR_HV_NOT_ACKNOWLEDGED	HRESULT	Windows

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STATUS_HV_INSUFFICIENT_BUFFERS	STATUS_HV_INVALID_VP_STATE

STATUS_HV_NOT_ACKNOWLEDGED

Interrupt delivery is waiting for the required acknowledgement

STATUS_HV_NOT_ACKNOWLEDGED indicates an ordering violation around virtual interrupt handling: the prior interrupt has not yet been acknowledged. It is not equivalent to a missing connection or an unavailable CPU. The guest must complete the interrupt acknowledgement path before an operation that depends on that state can continue.

On x64, Hyper-V documents EOI handling through the virtual APIC/SynIC model and an EOI assist page. Diagnose the actual acknowledgement sequence, including any interrupt masking or handler stall, rather than adding extra posts or assuming the interrupt was lost.

What to trace

The interrupt/vector, destination VP and timestamp of delivery.
Guest interrupt-handler entry, EOI/acknowledgement action and completion.
Interrupt masking, priority and concurrent virtual-interrupt activity.
The operation that observed the unacknowledged state and its ordering requirements.

References

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