xtrabackup timeout bug

I modified /usr/bin/innobackupex-1.5.1 like this:

    if (compare_versions($mysql_server_version, '4.0.22') == 0
        || compare_versions($mysql_server_version, '4.1.7') == 0) {
        # MySQL server version is 4.0.22 or 4.1.7
        mysql_send "COMMIT;";
        mysql_send "set interactive_timeout=28800;"; #added by gu lei
        mysql_send "set wait_timeout=28800;"; #added by gulei
        mysql_send "FLUSH TABLES WITH READ LOCK;";
    } else {
        # MySQL server version is other than 4.0.22 or 4.1.7
        mysql_send "set interactive_timeout=28800;"; #added by gu lei
        mysql_send "set wait_timeout=28800;"; #added by gu lei
        mysql_send "FLUSH TABLES WITH READ LOCK;";
        mysql_send "COMMIT;";
    }

Xtrabackup is successfully now.