What does NTSTATUS 0xC01C001C (STATUS_FLT_CONTEXT_ALREADY_LINKED) mean?

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Description:

the new Filter Manager context object was already attached to a different target object

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STATUS_FLT_ALREADY_ENLISTED	STATUS_FLT_NO_WAITER_FOR_REPLY

STATUS_FLT_CONTEXT_ALREADY_LINKED

STATUS_FLT_CONTEXT_ALREADY_LINKED describes the proposed context object, not the target object's existing slot. The same context allocation is already attached elsewhere and cannot be reused as state for another file, stream, volume, instance, or transaction.

This is the inverse of STATUS_FLT_CONTEXT_ALREADY_DEFINED. In the defined case, the target already has a context; in the linked case, the candidate context is already in use. Allocate a distinct context for the second target or retrieve the existing context that belongs to it. Do not detach and reattach a shared context simply to avoid allocation, because it destroys object ownership semantics.

Useful checks

The context pointer's origin and every successful prior FltSet*Context call.
Reference counts and cleanup callbacks for the context type.
Whether concurrent create/open paths are trying to share one per-object allocation.

FltSetStreamContext | Managing minifilter contexts | NTSTATUS reference

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