HRESULT 0x801F000A (ERROR_FLT_INTERNAL

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Description:

Filter Manager received an invalid callback result or inconsistent minifilter state.

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ERROR_FLT_POST_OPERATION_CLEANUP	ERROR_FLT_DELETING_OBJECT

ERROR_FLT_INTERNAL_ERROR

Validate the callback contract before blaming the filesystem

ERROR_FLT_INTERNAL_ERROR can describe several Filter Manager failures, but the status definition specifically calls out an invalid value returned by a minifilter pre-operation callback. Callback return values are not interchangeable: some require a registered post callback, some are legal only for IRP or fast-I/O operations, and completion requires a final nonpending IoStatus.Status.

The most useful investigation begins at the filter boundary. Capture the major function, operation flags, returned FLT_PREOP_CALLBACK_STATUS, completion-context pointer, and resulting IoStatus. A memory-corrupted callback value can look identical to a deliberate but illegal enum value, so Driver Verifier and stack traces are more informative than retrying the file operation.

Contract violations to inspect

Ensure every returned callback status is permitted for the current operation representation.
Confirm that statuses requesting a post callback have a registered post-operation routine.
Never complete an operation with STATUS_PENDING or the internal fast-I/O status.
Check for overwritten callback data or use-after-free around the pre-operation return path.

References

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