runner spawn_ready write failed: pipe_write lock poisoned

Error message

runner spawn_ready write failed: pipe_write lock poisoned

What it means

Error "runner spawn_ready write failed: pipe_write lock poisoned" thrown in openai/codex.

Source

Thrown at codex-rs/windows-sandbox-rs/src/bin/command_runner/win.rs:612

    let stdout_handle = ipc_spawn.stdout_handle;
    let stderr_handle = ipc_spawn.stderr_handle;
    let job = Arc::clone(&ipc_spawn.job);
    let mut conpty_owner = ipc_spawn.conpty_owner;
    let stdin_handle = ipc_spawn.stdin_handle;
    let hpc_handle = Arc::new(StdMutex::new(ipc_spawn.hpc_handle));

    let msg = FramedMessage {
        version: IPC_PROTOCOL_VERSION,
        message: Message::SpawnReady {
            payload: SpawnReady {
                process_id: unsafe { GetProcessId(pi.hProcess) },
            },
        },
    };
    if let Err(err) = if let Ok(mut guard) = pipe_write.lock() {
        write_frame(&mut *guard, &msg)
    } else {
        anyhow::bail!("runner spawn_ready write failed: pipe_write lock poisoned");
    } {
        let _ = send_error(
            &pipe_write,
            ErrorStage::WriteSpawnReady,
            /*windows_error_code*/ None,
            err.to_string(),
        );
        return Err(err);
    }
    let log_dir_owned = log_dir.map(Path::to_path_buf);
    let out_thread = spawn_output_reader(
        Arc::clone(&pipe_write),
        stdout_handle,
        OutputStream::Stdout,
        log_dir_owned.clone(),
    );
    let err_thread = if stderr_handle != windows_sys::Win32::Foundation::INVALID_HANDLE_VALUE {
        Some(spawn_output_reader(

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/windows-sandbox-rs/src/bin/command_runner/win.rs:612 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/5235f8459a903f53. Report an issue: GitHub.