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imf30.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=B6zqLY51; spf=pass (imf30.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1793371349; b=yfwyUKRX6ywflBP46/mI/ZbmDWws68APVXaNaQqa6Dhc+UM0ugnm9BPMjuU9QxhlsW+RD4 z9NCYQIUGRlhtrrXEHPTg100/BoiGPV67skAw4xyZGYT4qx22bw/OjCwL3/4GbM202p7e/ fuFDhbK96AZfDJ7Tv+fgDdCC7LHHNUc= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 8F5D643FBA; Fri, 30 Oct 2026 14:42:28 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C0A3A1F000C1; Fri, 30 Oct 2026 14:42:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793371348; bh=OU3zDVKepXMBwwR1kv5zeSUQ4EZ22iKhEWe2jjy3QKQ=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=B6zqLY51HL03HAbN7lCtJ3lFh7DfqAs+MNDqt4pDlmekKLANxMB0eErrw8PsTrl/J bhk9I9VG57rWGojcbjPYDvfXOZwhTgar1YEV5quKfL1b0Pwe/drjQd34EpBd3Y815W 1d9Q5G2Cd5PIPAL+eTV/ecP9RuZBDZ7nl5Bl3mFrSUhrXD4jFsLHyYyYQHsTylLkGn NlinJiDxut9+mjHqjAAEc2p/loJkudu7r+TscY+B+okD70yxrGultokQdRtQ0P+G3n 9sfhmK4CrBl/FEGq+tDpEnsQ7/pUWjxBP13v0uhwQR2Gi+eXMrx0jHd1x30BELyFhY i4QHMyc1GAT4g== Message-ID: <40eadc1b-5057-4286-9be2-021cb16bc020@kernel.org> Date: Fri, 30 Oct 2026 15:42:21 +0100 X-Archived-By: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/memory-failure: fix folio refcount leak and min_order_for_split() locking To: Tal Zussman Cc: akpm@linux-foundation.org, ljs@kernel.org, ziy@nvidia.com, baolin.wang@linux.alibaba.com, liam@infradead.org, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, usama.arif@linux.dev, linmiaohe@huawei.com, nao.horiguchi@gmail.com, richard.weiyang@gmail.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, mcgrof@kernel.org, liyouhong@kylinos.cn References: <20260806-try_to_split_thp_page-v1-1-a259e3387e38@kernel.org> <20261030105022.903008-1-tz2294@columbia.edu> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 50C8180007 X-Spam-Status: No, score=-7.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=4.0.1 X-Stat-Signature: c4kki6kh1s37tre6xyrwamn667ha8o9d X-HE-Tag: 1793371349-330000 X-HE-Meta: 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 kDUbQpWV YmSF4zrl7yZiVWJJB5BWA8Vr3SANFWXExGy/EGi82K8bQJ0UoHv4FzPEC6e+zbdffKAIX6Bl7FlY0vGyA6bKX0HQNezgHSSnHunRHN1dtbeMbJUUMAa2e/m6ft6PCK/VkgMcQNpJQrphjO1RFj3oL1rF/krudRw/ZRg6LGDWvTdKEm6y2QjV9N1U2FiBss5lSS9XonxOHcbCjvEXsJgxSe8PB75Wj2f7if5O//milkokYUpU5/e/h42niMZxAtOuxiEZhCdZtnHHEZjyG6R75p/Qeo4Q/tpiIBtkstl1NMSiwR/oOfVd7Hqwayoic/cqP3pQTAFLfoQbPoLu2rr+OZNHbQPxnQ7/vmyn4r7/IInnPjmiKY+k899HavtKOBFkEutHSSYVn7dPpSYIJzHZKHsa8nw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On 10/30/26 11:50, Tal Zussman wrote: > On Thu, Aug 06, 2026 at 01:14:38PM +0200, David Hildenbrand (Arm) wrote: >> hwpoison code can end up calling min_order_for_split() without holding >> the folio lock. There isn't really something that would prevent >> concurrent folio split. Consequently folio->mapping can get set to >> NULL after checking for "!folio->mapping", and if the compiler >> reloads folio->mapping, mapping_min_folio_order() would try to >> dereference NULL. > > Hi David, > > Did this patch ever make it in? If you ask this way ... I guess not? :D I can see if it still applies and resend + apply. -- Cheers, David