#syz test
diff --git a/mm/slab_common.c b/mm/slab_common.c
index d5a70a831a2a..73f4668d870d 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -1954,8 +1954,14 @@ void kvfree_call_rcu(struct rcu_head *head, void *ptr)
if (!head)
might_sleep();
- if (!IS_ENABLED(CONFIG_PREEMPT_RT) && kfree_rcu_sheaf(ptr))
+ if (!IS_ENABLED(CONFIG_PREEMPT_RT) && kfree_rcu_sheaf(ptr)) {
+ /*
+ * The object is now queued for deferred freeing via an RCU
+ * sheaf. Tell kmemleak to ignore it.
+ */
+ kmemleak_ignore(ptr);
return;
+ }
// Queue the object but don't yet schedule the batch.
if (debug_rcu_head_queue(ptr)) {
diff --git a/mm/slub.c b/mm/slub.c
index 20cb4f3b636d..9e34a9458162 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3014,8 +3014,10 @@ static void pcs_flush_all(struct kmem_cache *s)
free_empty_sheaf(s, spare);
}
- if (rcu_free)
+ if (rcu_free) {
+ kmemleak_ignore(rcu_free);
call_rcu(&rcu_free->rcu_head, rcu_free_sheaf_nobarn);
+ }
sheaf_flush_main(s);
}
@@ -3035,6 +3037,7 @@ static void __pcs_flush_all_cpu(struct kmem_cache *s,
unsigned int cpu)
}
if (pcs->rcu_free) {
+ kmemleak_ignore(pcs->rcu_free);
call_rcu(&pcs->rcu_free->rcu_head, rcu_free_sheaf_nobarn);
pcs->rcu_free = NULL;
}
@@ -4031,8 +4034,10 @@ static void flush_rcu_sheaf(struct work_struct *w)
local_unlock(&s->cpu_sheaves->lock);
- if (rcu_free)
+ if (rcu_free) {
+ kmemleak_ignore(rcu_free);
call_rcu(&rcu_free->rcu_head, rcu_free_sheaf_nobarn);
+ }
}
@@ -5948,8 +5953,15 @@ bool __kfree_rcu_sheaf(struct kmem_cache *s, void *obj)
* we flush before local_unlock to make sure a racing
* flush_all_rcu_sheaves() doesn't miss this sheaf
*/
- if (rcu_sheaf)
+ if (rcu_sheaf) {
+ /*
+ * TODO: Ideally this should be undone in rcu_free_sheaf,
+ * when the sheaf is returned to a barn to avoid generating
+ * false negatives.
+ */
+ kmemleak_ignore(rcu_sheaf);
call_rcu(&rcu_sheaf->rcu_head, rcu_free_sheaf);
+ }
local_unlock(&s->cpu_sheaves->lock);
base-commit: c23719abc3308df7ed3ad35650ad211fb2d2003d
--
2.43.0
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