The patch titled
Subject: debugobjects: avoid recursive calls with kmemleak
has been added to the -mm tree. Its filename is
debugobjects-avoid-recursive-calls-with-kmemleak.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/debugobjects-avoid-recursive-calls-with-kmemleak.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/debugobjects-avoid-recursive-calls-with-kmemleak.patch
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The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Qian Cai <cai@xxxxxx>
Subject: debugobjects: avoid recursive calls with kmemleak
CONFIG_DEBUG_OBJECTS_RCU_HEAD does not play well with kmemleak due to
recursive calls.
fill_pool
kmemleak_ignore
make_black_object
put_object
__call_rcu (kernel/rcu/tree.c)
debug_rcu_head_queue
debug_object_activate
debug_object_init
fill_pool
kmemleak_ignore
make_black_object
...
Hence, adding SLAB_NOLEAKTRACE to kmem_cache_create() to not register a
newly allocated debug objects at all.
Link: http://lkml.kernel.org/r/20181126165343.2339-1-cai@xxxxxx
Signed-off-by: Qian Cai <cai@xxxxxx>
Suggested-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Acked-by: Waiman Long <longman@xxxxxxxxxx>
Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/lib/debugobjects.c~debugobjects-avoid-recursive-calls-with-kmemleak
+++ a/lib/debugobjects.c
@@ -135,7 +135,6 @@ static void fill_pool(void)
if (!new)
return;
- kmemleak_ignore(new);
raw_spin_lock_irqsave(&pool_lock, flags);
hlist_add_head(&new->node, &obj_pool);
debug_objects_allocated++;
@@ -1128,7 +1127,6 @@ static int __init debug_objects_replace_
obj = kmem_cache_zalloc(obj_cache, GFP_KERNEL);
if (!obj)
goto free;
- kmemleak_ignore(obj);
hlist_add_head(&obj->node, &objects);
}
@@ -1184,7 +1182,8 @@ void __init debug_objects_mem_init(void)
obj_cache = kmem_cache_create("debug_objects_cache",
sizeof (struct debug_obj), 0,
- SLAB_DEBUG_OBJECTS, NULL);
+ SLAB_DEBUG_OBJECTS | SLAB_NOLEAKTRACE,
+ NULL);
if (!obj_cache || debug_objects_replace_static_objects()) {
debug_objects_enabled = 0;
_
Patches currently in -mm which might be from cai@xxxxxx are
debugobjects-avoid-recursive-calls-with-kmemleak.patch
