D53762.id166593.diff
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	diff --git a/sys/kern/kern_event.c b/sys/kern/kern_event.c
	--- a/sys/kern/kern_event.c
	+++ b/sys/kern/kern_event.c
	@@ -627,12 +627,20 @@
	kev.data = kn->kn_id; /* parent */
	kev.udata = kn->kn_kevent.udata;/* preserve udata */
	error = kqueue_register(kq, &kev, NULL, M_NOWAIT);
	+
	+ /*
	+ * Serialize updates to the kevent fields with threads scanning
	+ * the queue.
	+ */
	+ list->kl_lock(list->kl_lockarg);
	if (error)
	kn->kn_fflags \|= NOTE_TRACKERR;
	- if (kn->kn_fop->f_event(kn, NOTE_FORK))
	- KNOTE_ACTIVATE(kn, 0);
	- list->kl_lock(list->kl_lockarg);
	- KQ_LOCK(kq);
	+ if (kn->kn_fop->f_event(kn, NOTE_FORK)) {
	+ KQ_LOCK(kq);
	+ KNOTE_ACTIVATE(kn, 1);
	+ } else {
	+ KQ_LOCK(kq);
	+ }
	kn_leave_flux(kn);
	KQ_UNLOCK_FLUX(kq);
	}