openai/codex · error

runner resize pipe closed

Error message

runner resize pipe closed

What it means

Error "runner resize pipe closed" thrown in openai/codex.

Source

Thrown at codex-rs/windows-sandbox-rs/src/unified_exec/backends/windows_common.rs:161

        }
    });
}

pub(crate) fn make_runner_resizer(
    outbound_tx: std::sync::mpsc::Sender<FramedMessage>,
) -> Box<dyn FnMut(TerminalSize) -> Result<()> + Send> {
    Box::new(move |size: TerminalSize| {
        outbound_tx
            .send(FramedMessage {
                version: IPC_PROTOCOL_VERSION,
                message: Message::Resize {
                    payload: ResizePayload {
                        rows: size.rows,
                        cols: size.cols,
                    },
                },
            })
            .map_err(|_| anyhow::anyhow!("runner resize pipe closed"))
    })
}

fn send_runner_error(
    message: &str,
    stdout_tx: &broadcast::Sender<Vec<u8>>,
    stderr_tx: Option<&broadcast::Sender<Vec<u8>>>,
) {
    let formatted = format!("runner error: {message}\n").into_bytes();
    if let Some(stderr_tx) = stderr_tx {
        let _ = stderr_tx.send(formatted);
    } else {
        let _ = stdout_tx.send(formatted);
    }
}

View on GitHub (pinned to 339751715c)

Solutions

1. The sandbox runner exited and closed the resize pipe; restart the runner and the exec session.

When it happens

Trigger: Thrown at codex-rs/windows-sandbox-rs/src/unified_exec/backends/windows_common.rs:161 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/5b1d0d4c55b2c9a2. Report an issue: GitHub.