macOS kernel return 44 (KERN_RPC_TERMINATE

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: An internal Mach RPC path requested termination of an orphaned activation.

Could be also:
Constant	Type	OS
ippStsPrevLibraryUsed	Intel Ipp Status	Any
ECHRNG	errno	Linux
ESOCKTNOSUPPORT	errno	Mac
EL2HLT	errno	Solaris
PORT_DRIVER_INTERNAL	BugCheck Code	Windows

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KERN_RPC_SERVER_TERMINATED	KERN_RPC_CONTINUE_ORPHAN

KERN_RPC_TERMINATE_ORPHAN

A legacy Mach RPC control outcome

KERN_RPC_TERMINATE_ORPHAN is not a normal application-level failure. XNU labels it as an instruction to terminate an orphaned activation, placing it in the internal control flow of legacy Mach RPC and thread-activation handling.

If this value appears in low-level diagnostics, keep it separate from the request business result. The actionable question is why the RPC execution context became orphaned: for example, whether the peer, task, or owning service disappeared before the normal completion path.

What to inspect

Record the RPC endpoint, task/thread lifecycle events, and preceding IPC status.
Look for a service exit or teardown that races an outstanding request.
Do not expose this code to callers as proof that their requested operation was rejected on semantic grounds.
Prefer a supported higher-level service API where available rather than relying on legacy Mach activation behavior.

References

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