Found when compiled the kernel with Intel Compiler. 

If the value is initialized with zero the issue goes away:

diff --git a/mm/slab.c b/mm/slab.c
index 19d9218..08e0f70 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2160,7 +2160,7 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp)
 int
 __kmem_cache_create (struct kmem_cache *cachep, unsigned long flags)
 {
-   size_t left_over, freelist_size, ralign;
+   size_t left_over, freelist_size, ralign = 0;
    gfp_t gfp;
    int err;
    size_t size = cachep->size;