failed to remove stale synthetic bubblewrap mount marker {}:

Error message

failed to remove stale synthetic bubblewrap mount marker {}: {err}

What it means

Error "failed to remove stale synthetic bubblewrap mount marker {}: {err}" thrown in openai/codex.

Source

Thrown at codex-rs/linux-sandbox/src/linux_run_main.rs:1081

        let entry = entry.unwrap_or_else(|err| {
            panic!(
                "failed to read synthetic bubblewrap mount marker in {}: {err}",
                marker_dir.display()
            )
        });
        let path = entry.path();
        let Some(pid) = path
            .file_name()
            .and_then(|name| name.to_str())
            .and_then(|name| name.parse::<libc::pid_t>().ok())
        else {
            continue;
        };
        if !process_is_active(pid) {
            match fs::remove_file(&path) {
                Ok(()) => {}
                Err(err) if err.kind() == std::io::ErrorKind::NotFound => {}
                Err(err) => panic!(
                    "failed to remove stale synthetic bubblewrap mount marker {}: {err}",
                    path.display()
                ),
            }
            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) {

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/linux-sandbox/src/linux_run_main.rs:1081 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/278ac9a5318b10b1. Report an issue: GitHub.