diff --git a/mm/slab.c b/mm/slab.c
index 390e249..fa31cbb 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3432,6 +3432,11 @@ static __always_inline void __cache_free(struct kmem_cache *cachep, void *objp,
 	if (kasan_slab_free(cachep, objp, _RET_IP_))
 		return;
 
+	/* Use KCSAN to help debug racy use-after-free. */
+	if (!(cachep->flags & SLAB_TYPESAFE_BY_RCU))
+		__kcsan_check_access(objp, cachep->object_size,
+				     KCSAN_ACCESS_WRITE | KCSAN_ACCESS_ASSERT);
+
 	___cache_free(cachep, objp, caller);
 }
 
diff --git a/mm/slub.c b/mm/slub.c
index e5fc31c..ae39eb3 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1549,6 +1549,11 @@ static __always_inline bool slab_free_hook(struct kmem_cache *s, void *x)
 	if (!(s->flags & SLAB_DEBUG_OBJECTS))
 		debug_check_no_obj_freed(x, s->object_size);
 
+	/* Use KCSAN to help debug racy use-after-free. */
+	if (!(s->flags & SLAB_TYPESAFE_BY_RCU))
+		__kcsan_check_access(x, s->object_size,
+				     KCSAN_ACCESS_WRITE | KCSAN_ACCESS_ASSERT);
+
 	/* KASAN might put x into memory quarantine, delaying its reuse */
 	return kasan_slab_free(s, x, _RET_IP_);
 }