openai/codex · error

failed to fork for bubblewrap: {err}

Error message

failed to fork for bubblewrap: {err}

What it means

Error "failed to fork for bubblewrap: {err}" thrown in openai/codex.

Source

Thrown at codex-rs/linux-sandbox/src/linux_run_main.rs:584

}

fn run_bwrap_in_child_with_synthetic_mount_cleanup(bwrap_args: crate::bwrap::BwrapArgs) -> ! {
    let crate::bwrap::BwrapArgs {
        args,
        preserved_files,
        synthetic_mount_targets,
        protected_create_targets,
    } = bwrap_args;
    let setup_signal_mask = ForwardedSignalMask::block();
    let synthetic_mount_registrations = register_synthetic_mount_targets(&synthetic_mount_targets);
    let protected_create_registrations =
        register_protected_create_targets(&protected_create_targets);
    let exec_start_pipe = create_exec_start_pipe(!protected_create_targets.is_empty());
    let parent_pid = unsafe { libc::getpid() };
    let pid = unsafe { libc::fork() };
    if pid < 0 {
        let err = std::io::Error::last_os_error();
        panic!("failed to fork for bubblewrap: {err}");
    }

    if pid == 0 {
        reset_forwarded_signal_handlers_to_default();
        setup_signal_mask.restore();
        let setpgid_res = unsafe { libc::setpgid(0, 0) };
        if setpgid_res < 0 {
            let err = std::io::Error::last_os_error();
            panic!("failed to place bubblewrap child in its own process group: {err}");
        }
        terminate_with_parent(parent_pid);
        wait_for_parent_exec_start(exec_start_pipe[0], exec_start_pipe[1]);
        exec_bwrap(args, preserved_files);
    }

    close_child_exec_start_read(exec_start_pipe[0]);
    let protected_create_monitor = ProtectedCreateMonitor::start(&protected_create_targets);
    let signal_forwarders = install_bwrap_signal_forwarders(pid);

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/linux-sandbox/src/linux_run_main.rs:584 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/985746b956d6565b. Report an issue: GitHub.