Commit 79576102 authored by Christoph Lameter's avatar Christoph Lameter Committed by Pekka Enberg
Browse files

mm/slub: Add debugging to verify correct cache use on kmem_cache_free() 



Add additional debugging to check that the objects is actually from the cache
the caller claims. Doing so currently trips up some other debugging code. It
takes a lot to infer from that what was happening.

Reviewed-by: default avatarGlauber Costa <glommer@parallels.com>
Signed-off-by: default avatarChristoph Lameter <cl@linux.com>
[ penberg@kernel.org: Use pr_err() ]
Signed-off-by: default avatarPekka Enberg <penberg@kernel.org>
parent e21827aa

mm/slub.c

+7 −0
Original line number Diff line number Diff line
@@ -2614,6 +2614,13 @@ void kmem_cache_free(struct kmem_cache *s, void *x) 


	page = virt_to_head_page(x);



	if (kmem_cache_debug(s) && page->slab != s) {

		pr_err("kmem_cache_free: Wrong slab cache. %s but object"

			" is from  %s\n", page->slab->name, s->name);

		WARN_ON_ONCE(1);

		return;

	}



	slab_free(s, page, x, _RET_IP_);



	trace_kmem_cache_free(_RET_IP_, x);