When forking, the new thread deserves a name too. Don't just use the

td_startcopy section as it is not the right thing to do
in other cases (e.g. if starting a new thread from one that is already named).

sys/kern/kern_fork.c

@@ -495,6 +495,7 @@ again:
 	bcopy(&td->td_startcopy, &td2->td_startcopy,
 	    __rangeof(struct thread, td_startcopy, td_endcopy));
 
+	bcopy(&p2->p_comm, &td2->td_name, sizeof(td2->td_name));
 	td2->td_sigstk = td->td_sigstk;
 	td2->td_sigmask = td->td_sigmask;
 	td2->td_flags = TDF_INMEM;