Index: sys/kern/subr_pool.c
===================================================================
RCS file: /cvsroot/src/sys/kern/subr_pool.c,v
retrieving revision 1.214
diff -p -u -r1.214 subr_pool.c
--- sys/kern/subr_pool.c	9 Nov 2017 19:34:17 -0000	1.214
+++ sys/kern/subr_pool.c	9 Nov 2017 20:43:46 -0000
@@ -751,6 +751,8 @@ pool_get(struct pool *pp, int flags)
 	struct pool_item_header *ph;
 	void *v;
 
+	KASSERT((flags & PR_NOWAIT) || (flags & PR_WAITOK));
+	KASSERT(!(flags & PR_NOWAIT) || !(flags & PR_WAITOK));
 	KASSERTMSG((pp->pr_itemsperpage != 0),
 	    "%s: [%s] pr_itemsperpage is zero, "
 	    "pool not initialized?", __func__, pp->pr_wchan);
@@ -2230,6 +2232,8 @@ pool_cache_get_paddr(pool_cache_t pc, in
 	void *object;
 	int s;
 
+	KASSERT((flags & PR_NOWAIT) || (flags & PR_WAITOK));
+	KASSERT(!(flags & PR_NOWAIT) || !(flags & PR_WAITOK));
 	KASSERTMSG((!cpu_intr_p() && !cpu_softintr_p()) ||
 	    (pc->pc_pool.pr_ipl != IPL_NONE || cold || panicstr != NULL),
 	    "%s: [%s] is IPL_NONE, but called from interrupt context",