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Message-ID: <20191124003924.GA7816@localhost.localdomain>
Date: Sun, 24 Nov 2019 00:39:30 +0000
From: Roman Gushchin <guro@...com>
To: Christian Borntraeger <borntraeger@...ibm.com>
CC: "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
"hannes@...xchg.org" <hannes@...xchg.org>,
Kernel Team <Kernel-team@...com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-mm@...ck.org" <linux-mm@...ck.org>,
"longman@...hat.com" <longman@...hat.com>,
"shakeelb@...gle.com" <shakeelb@...gle.com>,
"vdavydov.dev@...il.com" <vdavydov.dev@...il.com>,
Heiko Carstens <heiko.carstens@...ibm.com>,
Janosch Frank <frankja@...ux.ibm.com>,
"kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: Re: WARNING bisected (was Re: [PATCH v7 08/10] mm: rework non-root
kmem_cache lifecycle management)
On Fri, Nov 22, 2019 at 05:28:46PM +0100, Christian Borntraeger wrote:
> On 21.11.19 19:45, Roman Gushchin wrote:
> > I see. Do you know, which kmem_cache it is? If not, can you, please,
> > figure it out?
>
> The release function for that ref is kmemcg_cache_shutdown.
>
Hi Christian!
Can you, please, test if the following patch resolves the problem?
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 8afa188f6e20..628e5f0ee19e 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -888,6 +888,8 @@ static int shutdown_memcg_caches(struct kmem_cache *s)
static void flush_memcg_workqueue(struct kmem_cache *s)
{
+ bool wait_for_children;
+
spin_lock_irq(&memcg_kmem_wq_lock);
s->memcg_params.dying = true;
spin_unlock_irq(&memcg_kmem_wq_lock);
@@ -904,6 +906,13 @@ static void flush_memcg_workqueue(struct kmem_cache *s)
* previous workitems on workqueue are processed.
*/
flush_workqueue(memcg_kmem_cache_wq);
+
+ mutex_lock(&slab_mutex);
+ wait_for_children = !list_empty(&s->memcg_params.children);
+ mutex_unlock(&slab_mutex);
+
+ if (wait_for_children)
+ rcu_barrier();
}
#else
static inline int shutdown_memcg_caches(struct kmem_cache *s)
--
Thanks!
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