What does macOS kernel return 0x10004008 (MACH_RCV_INVALID_DATA) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The receive buffer is invalid for copying inline Mach message data.

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MACH_RCV_INVALID_NOTIFY	MACH_RCV_PORT_DIED

MACH_RCV_INVALID_DATA

The receive-side inline-data buffer is not usable for this operation

MACH_RCV_INVALID_DATA is the receive counterpart for a bogus message buffer used for inline data. It identifies the caller-supplied receive storage, not an invalid payload produced by the peer. In particular, it differs from MACH_RCV_TOO_LARGE: an oversized buffer result can occur with valid storage, whereas this status says the buffer itself could not be used for the receive path.

A receive buffer must stay valid for the system call and match the selected receive API. Confusion is common when a wrapper switches between mach_msg and mach_msg_overwrite, reuses a send buffer after its lifetime ends, or passes a size that no longer matches the actual allocation.

What to inspect

Verify that the pointer is writable, alive for the complete operation, and paired with the correct receive-size value.
Record whether a separate receive buffer was supplied and whether the operation requested an overwrite or scatter receive.
Check allocation ownership across language boundaries; a valid object reference is not automatically a valid raw receive buffer.
Handle MACH_RCV_TOO_LARGE separately with a documented sizing policy instead of treating every receive error as a buffer-capacity problem.

References

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