macOS kernel return 0xE0008005 (kIOFireWireAlreadyRegistered): meaning

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The FireWire-family object or service was already registered in the relevant scope.

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kIOFireWireConfigROMInvalid	kIOFireWireMultipleTalkers

kIOFireWireAlreadyRegistered

Registration is an ownership boundary

kIOFireWireAlreadyRegistered reports a duplicate registration attempt within the FireWire-family context. It is not a remote-node protocol response. A registration API normally creates a local ownership, callback, address-space, or service relationship; submitting the same relationship twice can leave two clients believing they own one resource.

The status is especially useful during recovery code. A bus reset, reconnect, or application retry can make setup paths run more than once. Before adding a second registration, determine whether the original one remained active, was automatically restored, or was released by a teardown callback.

Find the earlier owner

Record the registration key, object identity, controller, bus generation, and caller that first created it.
Trace cleanup and callback ordering across reset, sleep, device removal, and process shutdown.
Use idempotent setup logic only where the API explicitly supports it; otherwise retain a single owner and explicit unregister path.
Do not treat duplicate registration as a transient transport failure and immediately retry it.

References

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