HRESULT 0x801F000E (ERROR_FLT_CBDQ_DISABLED): meaning and diagnosis

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A minifilter tried to insert callback data into a cancel-safe queue after that queue had been disabled.

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ERROR_FLT_DUPLICATE_ENTRY	ERROR_FLT_DO_NOT_ATTACH

ERROR_FLT_CBDQ_DISABLED

Queue shutdown and insertion raced

ERROR_FLT_CBDQ_DISABLED is returned by FltCbdqInsertIo when the target callback-data queue is disabled. A CBDQ gives a minifilter a cancel-safe way to retain I/O, but disabling it establishes a gate: new callback data is rejected while existing entries can be removed and completed according to the driver’s shutdown policy.

The result should be handled at the point where the original request is still owned correctly. A caller that returned FLT_PREOP_PENDING before confirming insertion can orphan an operation. Conversely, re-enabling a queue during instance teardown can admit work after the worker and backing state have already stopped.

Queue-state discipline

Insert the callback data and examine the return value before committing to the pending return path.
Coordinate FltCbdqDisable with worker shutdown and draining of queued operations.
Decide whether rejected requests should continue, fail, or complete through a nonqueued fallback.
Use FltCbdqEnable only when all consumers and queue-owned state are ready again.

References

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