From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 926BFCD4F21 for ; Wed, 13 May 2026 15:40:11 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 047606B00CC; Wed, 13 May 2026 11:40:11 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id F13C46B00CD; Wed, 13 May 2026 11:40:10 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E02696B00CE; Wed, 13 May 2026 11:40:10 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id CC67F6B00CC for ; Wed, 13 May 2026 11:40:10 -0400 (EDT) Received: from smtpin27.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 26DA716022C for ; Wed, 13 May 2026 15:40:10 +0000 (UTC) X-FDA: 84762807780.27.ED444D8 Received: from stravinsky.debian.org (stravinsky.debian.org [82.195.75.108]) by imf24.hostedemail.com (Postfix) with ESMTP id 4E26E180004 for ; Wed, 13 May 2026 15:40:08 +0000 (UTC) Authentication-Results: imf24.hostedemail.com; dkim=pass header.d=debian.org header.s=smtpauto.stravinsky header.b=cWvoBNcC; spf=pass (imf24.hostedemail.com: domain of leitao@debian.org designates 82.195.75.108 as permitted sender) smtp.mailfrom=leitao@debian.org; dmarc=pass (policy=none) header.from=debian.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1778686808; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=/6+k4U3CigWMPa6eRngECurunw+EDs/D/cMRSqJBO8A=; b=lBfONysru1EyLh4ipvH5+A05nEiS4AjDahREs14aUQ5FZqg+ITJ951PFOm8zYwnTwhpk19 +UDssG2Wv3fycLqV/nX87sVPKT9ggU6abWv8tGob5QauijW+rUSdhdG3sVf476/sQNa3xK f6iiH/eILqXgtGts0xM73eRQ/mlV0SY= ARC-Authentication-Results: i=1; imf24.hostedemail.com; dkim=pass header.d=debian.org header.s=smtpauto.stravinsky header.b=cWvoBNcC; spf=pass (imf24.hostedemail.com: domain of leitao@debian.org designates 82.195.75.108 as permitted sender) smtp.mailfrom=leitao@debian.org; dmarc=pass (policy=none) header.from=debian.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1778686808; a=rsa-sha256; cv=none; b=is3iICbzaMu7XA2AfhJZvGkHggur+70AzLFxY0QKHjYXXhyDhkDJbRUV3JqZZIVyRrQa7s Llx7NeuMn2iHMdAjNaqWRrlcHLx0rVpiplnNkg/ODGY2pVfMFEztg/ToHTtz0WJFiW86Hl qW2wecUK2o0S7kmZQ5pZF/rA6h1O6cQ= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=debian.org; s=smtpauto.stravinsky; h=X-Debian-User:Cc:To:In-Reply-To:References: Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description; bh=/6+k4U3CigWMPa6eRngECurunw+EDs/D/cMRSqJBO8A=; b=cWvoBNcCwzDa9aLv5h70R/mcbs PIWp5U14kA+Xrw+I4if9aIU6wpGyKgfEhW5Y8Z7W/D5YckhnxvCaaQShK/YvNegvCluvX6yQLR/I7 /PCeMjL+eIqsrTyTCpunIZzfvQtNLT50jVVytGljcbyenKQRWoOA6ARdWKsCtWR7EsNikscFT1oT8 Q31u/fP8EP3hLxhQCYHXWAmhAO3eL+gVi2aXdqB5Xx5LDLsT3nRNcZEJwbs7ClJEu+tlMSUpvft9g JwNERdRpSxbdaRYyLwJ2BLhoxkooUqmwnulAufiPZuJYLkL6Jbm2hBYUKd4Gb2wTf6HyGICLxQRt9 d3wcpdlg==; Received: from authenticated user by stravinsky.debian.org with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.96) (envelope-from ) id 1wNBgo-003GU6-26; Wed, 13 May 2026 15:40:02 +0000 From: Breno Leitao Date: Wed, 13 May 2026 08:39:34 -0700 Subject: [PATCH v7 3/6] mm/memory-failure: report MF_MSG_KERNEL for unrecoverable kernel pages MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260513-ecc_panic-v7-3-be2e578e61da@debian.org> References: <20260513-ecc_panic-v7-0-be2e578e61da@debian.org> In-Reply-To: <20260513-ecc_panic-v7-0-be2e578e61da@debian.org> To: Miaohe Lin , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Shuah Khan , Naoya Horiguchi , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Jonathan Corbet , Shuah Khan , "Liam R. Howlett" , "Liam R. Howlett" Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Breno Leitao , linux-trace-kernel@vger.kernel.org, kernel-team@meta.com X-Mailer: b4 0.16-dev-d5d98 X-Developer-Signature: v=1; a=openpgp-sha256; l=2392; i=leitao@debian.org; h=from:subject:message-id; bh=aUpEGreCiiwo7XiCDP3nHwzdk2ozZEEtKzqxsRLQzJQ=; b=owEBbQKS/ZANAwAIATWjk5/8eHdtAcsmYgBqBJs7vngK9RETyLDF63o1EnEfYGgE9nv+9reDZ QJAssZ8oZqJAjMEAAEIAB0WIQSshTmm6PRnAspKQ5s1o5Of/Hh3bQUCagSbOwAKCRA1o5Of/Hh3 bVBOD/42fbJ1SIKiXMo7f8f99fs30cZrVejZGjSwvrCi8ZkL5L+6m3DTmQ9ebEeTvLyJl4tugs9 nlyHwMuz2XZTExQHD/s96rlCtCq1qZuOTdiwBJMFxuWzXLcjFsIV1Pk5p7Ug0gZazN5eDuxRMxG 4shDiaETS5V3LOP6yuIBje+R60oa0u4UZ7BpFNswvrtQ06gQr+iiH8mH/FoqCJcauhUfCg44MEU 3aVobIQLqrcxhagv+UPkqlQ0y/pjxnq8MKzwg0lLdhJ5asf1Zy0f67ryt79v1O+NtZtV7RVdA8z pOkfJGHV/nD1WCSuy0iZHfgBsanH2szAR1791eyvG4czAd3bMen/vUDb00M/wmz2ppZu6fFqsVP TrP35jSeXKDgHqw41fkSddZ9V3MGXLcRpzrh+58jy6izLx1oFURAV6J7Ff2n20bMyTiIKcbP3kC uDmTAz9qcMgUzEKJe5YzkbvDwmtcw3B9hYbMKO/mdY49Bx62MuQTppPW+vo0IYHfaJElcvhvZ3H BLsLQSX03QA+kZyrb7NTYUctOHoTx3s3vRugPznfFbGM/74kjm1SfEBY9QNyAUJtckjPOvp6JLS dGe30VDx4YhSX7UDwzSpVH2eNfHaDpHe5Jsfsv5Szg2+g/v4X6bkY7lShw0liPepWBqZEAuKP3d MNdScg4izAJjT8w== X-Developer-Key: i=leitao@debian.org; a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D X-Debian-User: leitao X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 4E26E180004 X-Stat-Signature: uqyksrnfaj45yz9buuo8fgj6je5a98my X-HE-Tag: 1778686808-364049 X-HE-Meta: U2FsdGVkX18GlJi8GY632B5Kzxjr03J5wLmtD9zxyX/mZ6oxRvFRtvlRvw59mol7hkpgtb5/GF55Sc7WRgIf71e261ZrXtiB/gP9KPxSlOGAu9bcgOqiJXzzscIjMhpTkJFZFa/8wz3DsF/gLF6VRDqkQ6cgYuJ8bJvUjINi4Lf08m6YRICLI8ecm8QxG2r79hMimpfiwfGQ1p8hMt9KyspGSUUfjTwwO6jv6lMD8dFRsM+aplPCufujHlM+soGo9LxjSuoQOpcNI9qc8EC4FAKBKB1/KKQSjgOpUKliHMN7AbOMhF7bXQi3qIX60i0MDu9B8adrJ75tlXKVYFIFW+/lAePwxaScSHvnNpVQHCYGaW6TFdyzHbxcQScjj5vD54I/MLihACh+tL5zH4u/KxjKLEIZ3muuuvPOpFyGKGAVKjCQJTadVP0FSESuuAwCAk0NHj8dkcmp1HVqvCIr7HiWlwB4c5t7SHfl9GGlcbfu9M8xZq4UZTCfAI8XE7IsRw8H/Kqb5aKd/tLLVf3jfLqHv2YHH31gQ8qLd5m9mOIoRPZ6GB11I6LGqBb6V36HdTBRaZVB8TcErToJTvVjvnfTwMXwH0U6X5lfi4d6wOp1a6QLQpeNrym2bMHQqIhlHlF2P+xKBEeULffTHX1Gg8vgO4w2CvRuFai0rhtbePPZK6kIO23IBSXCn2/d25AfJnOSQBJ4J/ieFAvW495uZwBLAhzq3xVh95Uc5BCZPY3YbIZtEfu8rmR7vvMussMUiTKt6gUSNt/VrN7hCT2KsT9NluzXTTImG80Z2Vo8ovhOYAgCkX8XgK1zJORqvNc4cVASzK7g9clkrYeykU1jKdM4Pc2aie7uic8JLRL+ovHB74fTUyNFTa1W713LrSZgMR3B2wAjKE/taesVjNnoG+gFAsqEZkoLYsy7WQ/gEqcru/NjBoC6fCe2Str1zbi2/0pn5HafiBIIWoKTpU0 prAlIAJK 1GVixOSMJgaz/rFwWUYSHXYVX+cVIWzrbnK8vSrsJ87YKy3HX/Jvz7RRkyKMwNVQ/WH70Ytu27P8CmEBrOARDlniFae6SB4+GVxGpwGKVRViB+MozFt+bMiSZWpNxOWLkiZfuBY+H5CH3jL+vMokKLRlu83ZEteBUZU54ju/0rvgfXweJyANbpeUQ7ZZD0gb8qE3Bwh7d1DigbD268HbnnOqpU7j6V8fewW5hX+znUVQ6v8HxMbTRSZy4mgUiIAN8XOFPK3e/uM2W1f7QGF0PJ3eVZYVzR5c+QMyiVFNOu5dAnMCeuhY2Lcm18UQkG/SXuT00cYtVtBdFyZGUCjqcoRORUHHCBJxEIIxYa8ESfdYgBOkjo24t+bF99EXf0SeAQ3A0 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The previous patch teaches get_any_page() to return -ENOTRECOVERABLE for stable unhandlable kernel pages (PG_reserved, slab, vmalloc, page tables, kernel stacks, ...). memory_failure() still folds every negative return into MF_MSG_GET_HWPOISON, so callers that want to react to the unrecoverable cases (a panic option, smarter logging) cannot tell them apart from transient page-allocator races. Turn the post-call branch into a switch over the get_hwpoison_page() return code: map -ENOTRECOVERABLE to MF_MSG_KERNEL and any other negative return to MF_MSG_GET_HWPOISON. case 0 keeps the existing free-buddy / kernel-high-order handling and case 1 falls through to the rest of memory_failure() unchanged. The MF_MSG_KERNEL label and tracepoint string are kept as "reserved kernel page" to avoid breaking userspace tools that match on those literals; the enum value still adequately tags the failure even though it now also covers slab, vmalloc, page tables and kernel stack pages. Suggested-by: David Hildenbrand Signed-off-by: Breno Leitao --- mm/memory-failure.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index bae883df3ccb2..4b3a5d4190a07 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -2410,7 +2410,8 @@ int memory_failure(unsigned long pfn, int flags) * that may make page_ref_freeze()/page_ref_unfreeze() mismatch. */ res = get_hwpoison_page(p, flags); - if (!res) { + switch (res) { + case 0: if (is_free_buddy_page(p)) { if (take_page_off_buddy(p)) { page_ref_inc(p); @@ -2429,7 +2430,19 @@ int memory_failure(unsigned long pfn, int flags) res = action_result(pfn, MF_MSG_KERNEL_HIGH_ORDER, MF_IGNORED); } goto unlock_mutex; - } else if (res < 0) { + case 1: + /* Got a refcount on a handlable page. */ + break; + case -ENOTRECOVERABLE: + /* + * Stable unhandlable kernel-owned page (PG_reserved, + * slab, vmalloc, page tables, kernel stacks, ...). + * No recovery possible. + */ + res = action_result(pfn, MF_MSG_KERNEL, MF_IGNORED); + goto unlock_mutex; + default: + /* Transient lifecycle race with the page allocator. */ res = action_result(pfn, MF_MSG_GET_HWPOISON, MF_IGNORED); goto unlock_mutex; } -- 2.53.0-Meta