[ Upstream commit fcf88917dd435c6a4cb2830cb086ee58605a1d85 ]
The commit 510ded33e075 ("slab: implement slab_root_caches list")
changes the name of the list node within "struct kmem_cache" from "list"
to "root_caches_node", but leaks_show() still use the "list" which
causes a crash when reading /proc/slab_allocators.
You need to have CONFIG_SLAB=y and CONFIG_MEMCG=y to see the problem,
because without MEMCG all slab caches are root caches, and the "list"
node happens to be the right one.
Fixes: 510ded33e075 ("slab: implement slab_root_caches list")
Signed-off-by: Qian Cai <c...@lca.pw>
Reviewed-by: Tobin C. Harding <to...@kernel.org>
Cc: Tejun Heo <t...@kernel.org>
Cc: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
mm/slab.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/slab.c b/mm/slab.c
index b8e0ec74330f3..018d32496e8d1 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -4305,7 +4305,8 @@ static void show_symbol(struct seq_file *m, unsigned long
address)
static int leaks_show(struct seq_file *m, void *p)
{
- struct kmem_cache *cachep = list_entry(p, struct kmem_cache, list);
+ struct kmem_cache *cachep = list_entry(p, struct kmem_cache,
+ root_caches_node);
struct page *page;
struct kmem_cache_node *n;
const char *name;
--
2.20.1
