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From: Shakeel Butt <shakeel.butt@linux.dev>
To: Karl Erik Hofseth <karl.e.hofseth@opoint.com>
Cc: linux-mm@kvack.org, akpm@linux-foundation.org,
	qi.zheng@linux.dev,  kasong@tencent.com, baohua@kernel.org,
	axelrasmussen@google.com, yuanchu@google.com,
	 weixugc@google.com, hannes@cmpxchg.org, mhocko@kernel.org,
	roman.gushchin@linux.dev,  muchun.song@linux.dev,
	david@kernel.org, ljs@kernel.org, cgroups@vger.kernel.org,
	 regressions@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: Re: [REGRESSION] mm/memcg: folio/lruvec mismatch after cgroup offline: lru_size underflow and list_del corruption (7.1)
Date: Wed, 5 Aug 2026 12:07:01 -0700	[thread overview]
Message-ID: <anOHDekdEne06P97@linux.dev> (raw)
In-Reply-To: <anMmd1ADrDVwMO6v@work>

On Wed, Aug 05, 2026 at 02:03:03PM +0200, Karl Erik Hofseth wrote:
> Hi,
> 
> The following KASAN slab-use-after-free comes from a Fedora debug kernel
> build of 7.1.6 with de4660898b7a applied on top, provoked with the
> attached script. Further down are OOPSes generated by workloads in
> production on stock Fedora kernels. MGLRU on/off makes no difference.

Hi Karl,

Thanks a lot for the report and I think I understand the issue. We are not
handling the case of folio migration causing folio having objcg different
different from its node which breaks the assumption memcg_reparent_objcgs() have
for its locking lru of child and parent per-node LRUs.

Thanks for the reproducer and I was able to reproduce with inceased workers. I
will send out the fixes soon.

thanks,
Shakeel


      parent reply	other threads:[~2026-08-05 19:07 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-08-05 12:03 [REGRESSION] mm/memcg: folio/lruvec mismatch after cgroup offline: lru_size underflow and list_del corruption (7.1) Karl Erik Hofseth
2026-08-05 16:35 ` Andrew Morton
2026-08-05 17:22   ` Shakeel Butt
2026-08-05 19:07 ` Shakeel Butt [this message]

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