openai/codex · error · anyhow::Error

CancelSynchronousIo failed for runner {pipe_label} connect t

Error message

CancelSynchronousIo failed for runner {pipe_label} connect thread: {err}

What it means

Error "CancelSynchronousIo failed for runner {pipe_label} connect thread: {err}" thrown in openai/codex.

Source

Thrown at codex-rs/windows-sandbox-rs/src/elevated/runner_client.rs:266

            if let Some(connect_thread) = connect_thread.take() {
                let _ = connect_thread.join();
            }
            result
        }
        Err(mpsc::RecvTimeoutError::Timeout) => {
            if let Some(result) = try_take_completed_connect_result(
                &mut connect_thread,
                &connect_result_rx,
                thread_handle,
                &pipe_label,
            )? {
                result
            } else {
                let cancel_ok = unsafe { CancelSynchronousIo(thread_handle) };
                if cancel_ok == 0 {
                    let err = unsafe { GetLastError() };
                    if err != ERROR_NOT_FOUND {
                        Err(anyhow::anyhow!(
                            "CancelSynchronousIo failed for runner {pipe_label} connect thread: {err}"
                        ))
                    } else if let Some(result) = try_take_completed_connect_result(
                        &mut connect_thread,
                        &connect_result_rx,
                        thread_handle,
                        &pipe_label,
                    )? {
                        result
                    } else {
                        Err(anyhow::anyhow!(
                            "timed out after {}ms connecting runner {pipe_label}",
                            RUNNER_PIPE_CONNECT_TIMEOUT.as_millis()
                        ))
                    }
                } else {
                    // Do not join the helper thread on the timeout path. Parent-side cleanup will
                    // close the pipe handles, which lets the blocked connect unwind without

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/windows-sandbox-rs/src/elevated/runner_client.rs:266 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/427bf1897d30a0ff. Report an issue: GitHub.