NTSTATUS 0xC0350016 (STATUS_HV_ACKNOWLEDGED): meaning and diagnosis

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Description:

The previous Hyper-V virtual interrupt was already acknowledged.

Could be also:
Constant	Type	OS
ERROR_HV_ACKNOWLEDGED	HRESULT	Windows

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STATUS_HV_INVALID_VP_STATE	STATUS_HV_INVALID_SAVE_RESTORE_STATE

STATUS_HV_ACKNOWLEDGED

The acknowledgement transition has already happened

STATUS_HV_ACKNOWLEDGED is the converse of STATUS_HV_NOT_ACKNOWLEDGED: Hyper-V reports that the earlier virtual interrupt has already been acknowledged. It identifies duplicate or stale acknowledgement handling, not a new interrupt delivery.

Investigate whether two paths can signal completion for the same delivery, whether a timeout path races the normal interrupt handler, or whether a stale event record was reused after VP or port reconfiguration. The relevant correlation key is the interrupt/message delivery instance, not merely the vector number.

What to compare

The first acknowledgement and the later duplicate attempt, including their VP and interrupt context.
Normal completion, cancellation, timeout and teardown paths.
Message/interrupt ownership transfer between guest components.
Instrumentation that distinguishes one delivery from a repeated notification.

References

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