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STATUS_FLT_REGISTRATION_BUSY
STATUS_FLT_REGISTRATION_BUSY is a registration-time contention condition in Filter Manager's file-system database. It should be diagnosed as part of driver startup and concurrent filter lifecycle activity, not as a failure of an individual file operation or volume.
Record the exact registration attempt, filter name, and concurrent load/unload activity. A driver must not continue as though it obtained a valid filter handle. Whether a retry is appropriate depends on the driver's documented startup design; a blind loop in DriverEntry can turn a transient resource conflict into boot or service-start instability.
What to verify
- There is only one active registration path for the driver image.
- Prior failed initialization is cleaned up before a new registration attempt.
- Load/unload and installer actions are serialized around the filter service.
Loading and unloading minifilters | Filter Manager concepts | NTSTATUS reference
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