What does errno 55 (ENOANO) in Linux mean?

 
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ENOANO

ENOANO: Linux legacy errno

ENOANO (errno 3) reports that a legacy filesystem or communications interface cannot resolve the requested anode object. These names come from historical System V/XENIX compatibility interfaces; on modern Linux they usually point to a driver, STREAMS-compatibility layer, or legacy IPC contract rather than a general filesystem error.

Evidence to capture

Record anode identifier, owning filesystem/device, lookup call, and object generation.

Focused test

Look up a known-existing anode through the same interface and compare the result.

Correction

correct the stale/missing anode reference or rebuild only the owning metadata if required.

Verification

Repeat the original system call and confirm it passes the former ENOANO boundary with the same object identity.

Technical references


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