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From: Shakeel Butt To: Andrew Morton Cc: Karl Erik Hofseth , linux-mm@kvack.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) Message-ID: References: <20260805093522.e3ba46aca3a143207d68a65e@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260805093522.e3ba46aca3a143207d68a65e@linux-foundation.org> X-Migadu-Flow: FLOW_OUT X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 60B61140018 X-Stat-Signature: u6zuh9kmjbpzyitmow3cz1hrsskrkcrp X-HE-Tag: 1785950573-367512 X-HE-Meta: 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 m26WvEj4 6Tt5Ao+8k3+rZrH+o+Xc5OiozAQADHCNs2QxOp2hcdpETBvn6Dr1iD4jr98iD1vv8mEk5P/9T5nrJhjmLhJhSP3ic4EVBdMGsftNSvZdlq1Ql6IU15zfI+Ejc3IJ9+YYAVlhcU0pYs+lTSF78nKvhAfs3CjzJ2xXTi//qmyCa7jxWZpWGotQzl519NOliZxU7QYuukZxUbxdkkbXv6y9rIKFLIqHtULRRzDCN37Vb88A1x1XYd+XGkVow0AxTNupnVGlE680aFgGX0cuPACuscqpyEWHqIpmZXmwAe8z1U1yTSRLHqwScMUtYICpYatOb2qOQn4YgJlcy/wAgdYH2ctIKCE9QkcpqsrEsoVfaV/gBSURFR/3VRjU/8A== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Aug 05, 2026 at 09:35:22AM -0700, Andrew Morton wrote: > On Wed, 05 Aug 2026 14:03:03 +0200 (CEST) Karl Erik Hofseth wrote: > > > 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. > > Thanks. It does appear to be a race between migration and memcg > removal. > > Gemini provides some thoughts, although I've found these AI crash > interpretations to be a bit unreliable. > > https://share.gemini.google/Y6dMvOlHIFuV I am looking into the issue and will report back.