What does HRESULT 0x00042309 (VSS_S_ASYNC_PENDING) mean?

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Description:

The async VSS operation is still running. Query status again before using its result.

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CI_S_CATALOG_RESET	VSS_S_ASYNC_FINISHED

VSS_S_ASYNC_PENDING

VSS_S_ASYNC_PENDING is a status, not a failure. It means that the operation represented by an IVssAsync object is still running.

What to do for VSS_S_ASYNC_PENDING

Wait and call IVssAsync::QueryStatus again, or use Wait with an appropriate timeout.
Do not treat the operation result, snapshot identifiers, or writer data as final until the asynchronous operation reports completion.
Keep the IVssAsync object alive until the requester has observed a final status.

Microsoft: IVssAsync::QueryStatus

Diagnostic interpretation of VSS_S_ASYNC_PENDING

VSS_S_ASYNC_PENDING has the HRESULT value 0x00042309. AllStat records the condition as “The asynchronous operation is pending.”. For VSS_S_ASYNC_PENDING, in practice, interpret that wording at the boundary owned by storage, volume management, or structured-storage state, rather than treating the value as a generic Windows message.

Evidence to capture for VSS_S_ASYNC_PENDING

Record the exact COM method or Windows API, its input object, the calling thread, and the full 0x00042309 value before a wrapper converts it to an exception or Boolean result.
Capture any IErrorInfo text, activity identifier, event-log entry, and subsystem trace that mentions VSS_S_ASYNC_PENDING or the vss / async / pending operation.
Reproduce VSS_S_ASYNC_PENDING with the smallest valid input and note whether the result changes with identity, architecture, service state, or target object.

Retry and recovery for VSS_S_ASYNC_PENDING

Retry VSS_S_ASYNC_PENDING only when the owning API documents a transient state or after the condition described as “The asynchronous operation is pending.” has changed. For VSS_S_ASYNC_PENDING, configuration, policy, format, and authorization failures normally require correction first; an immediate loop can hide the original call site and add secondary errors.

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