failed to inspect synthetic bubblewrap mount target {}: {err

Error message

failed to inspect synthetic bubblewrap mount target {}: {err}

What it means

Error "failed to inspect synthetic bubblewrap mount target {}: {err}" thrown in openai/codex.

Source

Thrown at codex-rs/linux-sandbox/src/linux_run_main.rs:1255

    let directory = OpenOptions::new()
        .read(true)
        .custom_flags(libc::O_PATH | libc::O_DIRECTORY | libc::O_NOFOLLOW)
        .open(path)?;
    let directory_path = PathBuf::from(format!("/proc/self/fd/{}", directory.as_raw_fd()));
    fs::set_permissions(&directory_path, fs::Permissions::from_mode(0o700))?;
    for entry in fs::read_dir(directory_path)? {
        make_directory_tree_writable(&entry?.path())?;
    }
    Ok(())
}

fn remove_synthetic_mount_target(target: &crate::bwrap::SyntheticMountTarget) {
    let path = target.path();
    let metadata = match fs::symlink_metadata(path) {
        Ok(metadata) => metadata,
        Err(err) if err.kind() == std::io::ErrorKind::NotFound => return,
        Err(err) => panic!(
            "failed to inspect synthetic bubblewrap mount target {}: {err}",
            path.display()
        ),
    };
    if !target.should_remove_after_bwrap(&metadata) {
        return;
    }
    match target.kind() {
        crate::bwrap::SyntheticMountTargetKind::EmptyFile => match fs::remove_file(path) {
            Ok(()) => {}
            Err(err) if err.kind() == std::io::ErrorKind::NotFound => {}
            Err(err) => panic!(
                "failed to remove synthetic bubblewrap mount target {}: {err}",
                path.display()
            ),
        },
        crate::bwrap::SyntheticMountTargetKind::EmptyDirectory => match fs::remove_dir(path) {
            Ok(()) => {}

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/linux-sandbox/src/linux_run_main.rs:1255 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/d15f009ec498b46e. Report an issue: GitHub.