diff --git a/jemalloc/src/jemalloc.c b/jemalloc/src/jemalloc.c
index 61a36c73..c1aaddae 100644
--- a/jemalloc/src/jemalloc.c
+++ b/jemalloc/src/jemalloc.c
@@ -735,7 +735,8 @@ malloc_init_hard(void)
 	 */
 	ARENA_SET(arenas[0]);
 
-	malloc_mutex_init(&arenas_lock);
+	if (malloc_mutex_init(&arenas_lock))
+		return (true);
 
 #ifdef JEMALLOC_PROF
 	if (prof_boot2()) {
diff --git a/jemalloc/src/rtree.c b/jemalloc/src/rtree.c
index 7753743c..eb440aac 100644
--- a/jemalloc/src/rtree.c
+++ b/jemalloc/src/rtree.c
@@ -20,7 +20,10 @@ rtree_new(unsigned bits)
 	memset(ret, 0, offsetof(rtree_t, level2bits) + (sizeof(unsigned) *
 	    height));
 
-	malloc_mutex_init(&ret->mutex);
+	if (malloc_mutex_init(&ret->mutex)) {
+		/* Leak the rtree. */
+		return (NULL);
+	}
 	ret->height = height;
 	if (bits_per_level * height > bits)
 		ret->level2bits[0] = bits % bits_per_level;