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 discriminator: Treat this as an in-progress completion state: poll or wait on the asynchronous VSS operation rather than diagnosing a failure. The operation has not completed yet and may still succeed.

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