Index: sys/kern/subr_kmem.c
===================================================================
RCS file: /cvsroot/src/sys/kern/subr_kmem.c,v
retrieving revision 1.64
diff -p -u -r1.64 subr_kmem.c
--- sys/kern/subr_kmem.c	7 Nov 2017 18:35:57 -0000	1.64
+++ sys/kern/subr_kmem.c	9 Nov 2017 22:05:39 -0000
@@ -260,6 +260,9 @@ kmem_intr_alloc(size_t requested_size, k
 
 	KASSERT(requested_size > 0);
 
+	KASSERT((kmflags & KM_SLEEP) || (kmflags & KM_NOSLEEP));
+	KASSERT(!(kmflags & KM_SLEEP) || !(kmflags & KM_NOSLEEP));
+
 #ifdef KMEM_GUARD
 	if (kmem_guard_enabled) {
 		return kmem_guard_alloc(&kmem_guard, requested_size,