Index: sys/kern/sched_4bsd.c
===================================================================
--- sys/kern/sched_4bsd.c
+++ sys/kern/sched_4bsd.c
@@ -792,6 +792,8 @@
 {
 	struct td_sched *ts;
 
+	childtd->td_oncpu = NOCPU;
+	childtd->td_lastcpu = NOCPU;
 	childtd->td_estcpu = td->td_estcpu;
 	childtd->td_lock = &sched_lock;
 	childtd->td_cpuset = cpuset_ref(td->td_cpuset);
@@ -1671,6 +1673,8 @@
 	} else {
 		lock_profile_release_lock(&sched_lock.lock_object);
 		MPASS(td->td_lock == &sched_lock);
+		td->td_lastcpu = td->td_oncpu;
+		td->td_oncpu = NOCPU;
 	}
 	mtx_assert(&sched_lock, MA_OWNED);
 	KASSERT(curthread->td_md.md_spinlock_count == 1, ("invalid count"));
Index: sys/kern/sched_ule.c
===================================================================
--- sys/kern/sched_ule.c
+++ sys/kern/sched_ule.c
@@ -2080,6 +2080,8 @@
 	 */
 	ts = td->td_sched;
 	ts2 = child->td_sched;
+	child->td_oncpu = NOCPU;
+	child->td_lastcpu = NOCPU;
 	child->td_lock = TDQ_LOCKPTR(tdq);
 	child->td_cpuset = cpuset_ref(td->td_cpuset);
 	ts2->ts_cpu = ts->ts_cpu;
@@ -2703,6 +2705,8 @@
 		MPASS(td->td_lock == TDQ_LOCKPTR(tdq));
 		tdq_load_rem(tdq, td);
 		lock_profile_release_lock(&TDQ_LOCKPTR(tdq)->lock_object);
+		td->td_lastcpu = td->td_oncpu;
+		td->td_oncpu = NOCPU;
 	}
 	KASSERT(curthread->td_md.md_spinlock_count == 1, ("invalid count"));
 	newtd = choosethread();