C12 [01/19] slub: Add debugging to verify correct cache use on kmem_cache_free()
From: Christoph Lameter <hidden>
Date: 2012-08-20 20:50:36
Subsystem:
memory management, slab allocator, the rest · Maintainers:
Andrew Morton, Vlastimil Babka, Harry Yoo, Linus Torvalds
Possibly related (same subject, not in this thread)
- 2012-08-20 · C12 [01/19] slub: Add debugging to verify correct cache use on kmem_cache_free() · Christoph Lameter <hidden>
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. V2: Only warn once. Signed-off-by: Christoph Lameter <redacted> --- mm/slub.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/mm/slub.c b/mm/slub.c
index c67bd0a..00f8557 100644
--- a/mm/slub.c
+++ b/mm/slub.c@@ -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) { + printk("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);
--
1.7.9.5
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