failed to unregister synthetic bubblewrap mount target {}: {

Error message

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

What it means

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

Source

Thrown at codex-rs/linux-sandbox/src/linux_run_main.rs:1102

                ),
            }
            continue;
        }
        let matches_marker = matches_marker(&path);
        if matches_marker {
            return true;
        }
    }
    false
}

fn cleanup_synthetic_mount_targets(targets: &[SyntheticMountTargetRegistration]) {
    with_synthetic_mount_registry_lock(|| {
        for target in targets.iter().rev() {
            match fs::remove_file(&target.marker_file) {
                Ok(()) => {}
                Err(err) if err.kind() == std::io::ErrorKind::NotFound => {}
                Err(err) => panic!(
                    "failed to unregister synthetic bubblewrap mount target {}: {err}",
                    target.target.path().display()
                ),
            }
        }

        for target in targets.iter().rev() {
            if synthetic_mount_marker_dir_has_active_process(&target.marker_dir) {
                continue;
            }
            remove_synthetic_mount_target(&target.target);
            match fs::remove_dir(&target.marker_dir) {
                Ok(()) => {}
                Err(err) if err.kind() == std::io::ErrorKind::NotFound => {}
                Err(err) if err.kind() == std::io::ErrorKind::DirectoryNotEmpty => {}
                Err(err) => panic!(
                    "failed to remove synthetic bubblewrap mount marker directory {}: {err}",
                    target.marker_dir.display()

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/linux-sandbox/src/linux_run_main.rs:1102 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/80ca7e51fd26f486. Report an issue: GitHub.