openai/codex · error

failed to read bubblewrap stderr: {err}

Error message

failed to read bubblewrap stderr: {err}

What it means

Error "failed to read bubblewrap stderr: {err}" thrown in openai/codex.

Source

Thrown at codex-rs/linux-sandbox/src/linux_run_main.rs:1466

                panic!("failed to redirect stderr for bubblewrap: {err}");
            }
            close_fd_or_panic(write_fd, "close write end in bubblewrap child");
        }

        exec_bwrap(args, preserved_files);
    }

    let signal_forwarders = install_bwrap_signal_forwarders(pid);
    setup_signal_mask.restore();
    // Parent: close the write end and read stderr while the child runs.
    close_fd_or_panic(write_fd, "close write end in bubblewrap parent");

    // SAFETY: `read_fd` is a valid owned fd in the parent.
    let mut read_file = unsafe { File::from_raw_fd(read_fd) };
    let mut stderr_bytes = Vec::new();
    let mut limited_reader = (&mut read_file).take(MAX_PREFLIGHT_STDERR_BYTES);
    if let Err(err) = limited_reader.read_to_end(&mut stderr_bytes) {
        panic!("failed to read bubblewrap stderr: {err}");
    }

    let status = wait_for_bwrap_child(pid);
    let cleanup_signal_mask = ForwardedSignalMask::block();
    BWRAP_CHILD_PID.store(0, Ordering::SeqCst);
    cleanup_synthetic_mount_targets(&synthetic_mount_registrations);
    cleanup_protected_create_targets(&protected_create_registrations);
    signal_forwarders.restore();
    cleanup_signal_mask.restore();
    if libc::WIFSIGNALED(status) {
        exit_with_wait_status(status);
    }

    String::from_utf8_lossy(&stderr_bytes).into_owned()
}

/// Close an owned file descriptor and panic with context on failure.
///

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/linux-sandbox/src/linux_run_main.rs:1466 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/877e2cafb760d158. Report an issue: GitHub.