[MonetDB-users] !FATAL: GDKlockHome: Database lock '.gdk_lock' denied

System hanged for some reason. Cannot kill the process: user 2389 0.0 0.0 0 0 ?? E 6:33PM 0:00.00 (mserver5) Hence cannot restart server. Short of restarting the whole machine, is there a better way to handle this please?