Index: sys/kern/kern_proc.c
===================================================================
RCS file: /cvsroot/src/sys/kern/kern_proc.c,v
retrieving revision 1.235
diff -u -r1.235 kern_proc.c
--- sys/kern/kern_proc.c	30 Sep 2019 21:13:33 -0000	1.235
+++ sys/kern/kern_proc.c	6 Dec 2019 17:09:35 -0000
@@ -2458,7 +2458,8 @@
 			ki->p_estcpu += l->l_estcpu;
 		}
 	}
-	sigplusset(&p->p_sigpend.sp_set, &ss2);
+	sigplusset(&p->p_sigpend.sp_set, &ss1);
+	sigminusset(&ss2, &ss1);
 	memcpy(&ki->p_siglist, &ss1, sizeof(ki_sigset_t));
 	memcpy(&ki->p_sigmask, &ss2, sizeof(ki_sigset_t));