Start up an funit-child 60 0 start FryskGui and monitor the funit-child with all observers selected. send funit-child a kill -s SIGALRM you get a core warning: {frysk.proc.LinuxTask@8062a0,pid=26542,tid=26542,state=detached} in state "detached" did not handle handleAddObservation frysk.proc.State.unhandled(FryskGui) frysk.proc.TaskState.handleAddObservation(FryskGui) frysk.proc.Task.handleAddObservation(FryskGui) frysk.proc.TaskObservation.handleAdd(FryskGui) frysk.proc.ProcState$3.handleAddObservation(FryskGui) frysk.proc.Proc.handleAddObservation(FryskGui) frysk.proc.Proc$8.execute(FryskGui) frysk.event.EventLoop.runEventLoop(FryskGui) frysk.event.EventLoop.run(FryskGui) frysk.gui.Gui$3.run(FryskGui) java.lang.Thread.run(libgcj.so.7rh)