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imf12.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=TotbYCTm; spf=pass (imf12.hostedemail.com: domain of chleroy@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=chleroy@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1769969808; a=rsa-sha256; cv=none; b=icDvIv5gh3Natw/Tc0Nxjf0B2wobbNqjfadtNM3jMhn2Kwfump47INqMXGROEEnM1h6eXY vKbdI7kDoUNXClVGnFwdSYxglZMquFL4HSMO+F2zyWKNbL1RxXDffkaMnqs3Rx+9VK7jZY NE3DAZgWfFUcXgoU6kZxmSiL5Tf4szg= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id C499660008; Sun, 1 Feb 2026 18:16:47 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9E156C4CEF7; Sun, 1 Feb 2026 18:16:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1769969807; bh=jTxTykOO3gF/25vPb3RH+JojwLhNjA5nr8MIb7Drh9s=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=TotbYCTmAHhjil7P+tewRpSToMQjJo5gAeHnQY/Fvi2lQGxInIlJ1Gvlfn898pdJl 2541LzL77vFtOq140u61Yr8E183QmGMWMmijfrx5erFeq304C1u+yqo7SI66oMbdYV UDrcmkOgZqo+8LZgNpWWg7sFIw2/JWuW9Q/jjV5Z0wJqvFphPOQpixeNhzkZcZ6ICx z1rs9quDxCtooxs66HwUDOwS4siTfw4QmBisEdRrRvnMVV/G7QjW0TuZTpyu8xpwB3 YjXNNao+/heFiSjJ0fX4dmej7rtTtGrNN8pNqSaQRQAHbvY2FqWsswGeAJXwtmi//J wpClfO2LzOSDQ== Message-ID: Date: Sun, 1 Feb 2026 19:16:43 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Subject: Regression: CONFIG_ASYNC_KERNEL_PGTABLE_FREE causes memory exhaustion and stalls on busy Cascade Lake server (6.18.7 only) To: Robert Dinse , akpm@linux-foundation.org Cc: linux-mm@kvack.org References: <06843c7a-909b-41e5-9359-2be51cf9dffa@eskimo.com> Content-Language: fr-FR From: "Christophe Leroy (CS GROUP)" In-Reply-To: <06843c7a-909b-41e5-9359-2be51cf9dffa@eskimo.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Stat-Signature: jf4ozp66acd8muk3qniuuxo7jfb6xbs6 X-Rspamd-Queue-Id: 8945A40002 X-Rspam-User: X-HE-Tag: 1769969808-147330 X-HE-Meta: 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 ub1I5nmP fvgjWmf6cUtSsHrfuQE5UiavfkDXZ/Z2emsmkiKJyLuGukIxfvCTqwfeFH4V9peCBJqRCax5IqFa8QxdgNPPfjZsuZylGVs87Jv7Q602bXzP/EmQytoNWhcTVtfxtck/M9D0Fu+PUO+TmxihhwrMZ8WoI8zIzcbBFn+c7+OtTi60OYP7BfXFrcJsKA1cjXDrmFP17ghQSsHXuhH4oEBI3kw92cW+VT2wyuqTA91Kbmm9CF98mTGW8t1DfLPAuyf/xq8YX44CF3ZrKXscofFQU11Ouzo+lBE5hcibHWjRNiuRrfcIulJOq+9DMEjvcXfgEfWb/ZY8qbW1+8UU= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Le 29/01/2026 à 07:10, Robert Dinse a écrit : > > > Reverting to 6.18.6 immediately restores the previous stable behavior. > > Attempt to disable CONFIG_ASYNC_KERNEL_PGTABLE_FREE > --------------------------------------------------- > I attempted to disable the new async kernel page table freeing feature: > > - The symbol `CONFIG_ASYNC_KERNEL_PGTABLE_FREE` appears in `.config` > - However, it does not appear in xconfig or other configuration frontends > - Manually editing `.config` to disable it works only until the next > `make`: >   - As soon as I re-run the build, the option is silently re-enabled > - I tried to chase the Kconfig dependencies, but the chain was too > convoluted; it appears to be effectively non-user-selectable and forced > on by default for my architecture. > > From an operator perspective, this feature as currently implemented is > not workable on a busy machine like this, and the inability to disable > it makes it difficult to bisect or run with a known-good configuration. > Try reverting commit 9f0a7ab700f8 ("iommu/sva: invalidate stale IOTLB entries for kernel address space") ? Christophe