errno 43 (EIDRM): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: A System V IPC object was removed while the process was using it or waiting for it to become available.

Could be also:
Constant	Type	OS
KERN_RPC_SERVER_TERMINATED	Kern return	Mac
ippStsWaterfall	Intel Ipp Status	Any
EPROTONOSUPPORT	errno	Mac
ENOCSI	errno	Solaris
PANIC_STACK_SWITCH	BugCheck Code	Windows

Previous	Next
EILSEQ	EPROTONOSUPPORT

EIDRM

What disappeared

EIDRM means that a System V IPC object identified by the caller—such as a message queue or semaphore set—was removed from the kernel. A process blocked in a send, receive, or semaphore operation can wake with this result because the object vanished while it was waiting. It is therefore a lifecycle event, not a transient empty-queue or busy-lock result.

Applications that cache raw IPC identifiers are especially exposed. A supervisor, cleanup job, deployment, namespace teardown, or crash-recovery tool may delete and recreate an IPC object with the same logical purpose but a different kernel identity. Reusing the old numeric identifier after EIDRM is unsafe.

Recovery strategy

Log which IPC object was removed, who owns its lifecycle, and whether the process was blocked or actively operating on it.
Discard the identifier and re-run the documented discovery or initialization sequence; do not retry the stale call.
Coordinate creation, shutdown, and cleanup so consumers receive an explicit stop or generation change before removal.
Include generation or ownership data in higher-level protocols when multiple instances may recreate the same named resource.

References

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