openai/codex · error

runner: unsupported protocol version {}

Error message

runner: unsupported protocol version {}

What it means

Error "runner: unsupported protocol version {}" thrown in openai/codex.

Source

Thrown at codex-rs/windows-sandbox-rs/src/bin/command_runner/win.rs:189

    Ok(())
}

fn windows_error_code(err: &anyhow::Error) -> Option<u32> {
    err.chain().find_map(|cause| {
        cause
            .downcast_ref::<std::io::Error>()
            .and_then(std::io::Error::raw_os_error)
            .and_then(|code| u32::try_from(code).ok())
    })
}

/// Read and validate the initial spawn request frame.
fn read_spawn_request(reader: &mut File) -> Result<SpawnRequest> {
    let Some(msg) = read_frame(reader)? else {
        anyhow::bail!("runner: pipe closed before spawn_request");
    };
    if msg.version != IPC_PROTOCOL_VERSION {
        anyhow::bail!("runner: unsupported protocol version {}", msg.version);
    }
    match msg.message {
        Message::SpawnRequest { payload } => Ok(*payload),
        other => anyhow::bail!("runner: expected spawn_request, got {other:?}"),
    }
}

fn read_acl_mutex_exists() -> Result<bool> {
    let name = to_wide(OsStr::new(READ_ACL_MUTEX_NAME));
    let handle = unsafe { OpenMutexW(MUTEX_ALL_ACCESS, 0, name.as_ptr()) };
    if handle == 0 {
        let err = unsafe { GetLastError() };
        if err == ERROR_FILE_NOT_FOUND {
            return Ok(false);
        }
        return Err(anyhow::anyhow!("OpenMutexW failed: {err}"));
    }
    unsafe {

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/windows-sandbox-rs/src/bin/command_runner/win.rs:189 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of openai/codex@339751715c (2026-08-25). Data as JSON: /api/errors/b2e69462213c2eb0. Report an issue: GitHub.