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

Error message

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

What it means

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

Source

Thrown at codex-rs/linux-sandbox/src/linux_run_main.rs:1267

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(()) => {}
            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 target {}: {err}",
                path.display()
            ),
        },
    }
}

fn process_is_active(pid: libc::pid_t) -> bool {
    let result = unsafe { libc::kill(pid, 0) };

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/linux-sandbox/src/linux_run_main.rs:1267 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/ebc8c20ba9fb9967. Report an issue: GitHub.