From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 527713F9F5D for ; Fri, 26 Jun 2026 16:28:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782491326; cv=none; b=vA5aRUbZcKp94J+L3KyH7WIyD4op7++A8aVLlxpdgzulqrSlUE4Aj2sIx4dYewIYtqO2cTWRzfOYRPkCE3eE62L1A2mLiSOtB4aGHBxsWcynkHMQyXxmCYlexHITy6BzMvIyxs2fxhxmrwsicKRAgt7C2B6LW5Ktpa/7M6WSL5g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782491326; c=relaxed/simple; bh=Uq9RhstAEcpDl/IVzyxib7oiODNDxAYSJEp5138R/pw=; h=Date:To:From:Subject:Message-Id; b=p1YlWhFbZzUyVoAjbjTAnuVKJdVizqThwAnCeIL7WQXg/VQ8nr5kr+4RYtA11uC5tnKRQ2zs6cjrrX6OsuN8A2ir/1Q7rIMhg4PqiXuS7vzI7nutWRf+CaOQL4nmzz7aIbEsqgNwiBAjWHOddgQnOWVBzQaUurBhJoE9HyeOIFU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=aG6SL7Le; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="aG6SL7Le" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2640F1F000E9; Fri, 26 Jun 2026 16:28:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1782491325; bh=5M7OWT7F13X0iZkZLPI+4xaKkiSHIyQJZP2RrBW4+z0=; h=Date:To:From:Subject; b=aG6SL7LesrbBPn0MhgcZUmc7yHEaGEFk3K95Z3EMIsH4MaKTEt7cQOnmpvopByFsF 2yXxz7qI0UkOgkl34lK6gszlgb2GnZKoEpTLCbduIu4EvJOb3EmSL27zcDFM5CxAej LExuqHThELVnI9z5bb9vTEXo2XXsNzxoQfyfZcao= Date: Fri, 26 Jun 2026 09:28:44 -0700 To: mm-commits@vger.kernel.org,leitao@debian.org,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-memory-failure-report-mf_msg_kernel-for-unrecoverable-kernel-pages.patch added to mm-new branch Message-Id: <20260626162845.2640F1F000E9@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm/memory-failure: report MF_MSG_KERNEL for unrecoverable kernel pages has been added to the -mm mm-new branch. Its filename is mm-memory-failure-report-mf_msg_kernel-for-unrecoverable-kernel-pages.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memory-failure-report-mf_msg_kernel-for-unrecoverable-kernel-pages.patch This patch will later appear in the mm-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. The mm-new branch of mm.git is not included in linux-next If a few days of testing in mm-new is successful, the patch will me moved into mm.git's mm-unstable branch, which is included in linux-next Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Breno Leitao Subject: mm/memory-failure: report MF_MSG_KERNEL for unrecoverable kernel pages Date: Fri, 26 Jun 2026 08:33:17 -0700 The previous patch teaches get_any_page() to return -ENOTRECOVERABLE for stable unhandlable kernel pages (PG_reserved, slab, page tables, large-kmalloc). 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, page tables and large-kmalloc pages. Link: https://lore.kernel.org/20260626-ecc_panic-v10-3-6dacb8ad024d@debian.org Signed-off-by: Breno Leitao Suggested-by: David Hildenbrand Acked-by: David Hildenbrand (Arm) Acked-by: Miaohe Lin Cc: Jonathan Corbet Cc: Lance Yang Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: "Masami Hiramatsu (Google)" Cc: Mathieu Desnoyers Cc: Michal Hocko Cc: Mike Rapoport Cc: Naoya Horiguchi Cc: Shuah Khan Cc: Steven Rostedt Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- mm/memory-failure.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) --- a/mm/memory-failure.c~mm-memory-failure-report-mf_msg_kernel-for-unrecoverable-kernel-pages +++ a/mm/memory-failure.c @@ -2434,7 +2434,8 @@ try_again: * 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); @@ -2453,7 +2454,19 @@ try_again: 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, page tables, large-kmalloc). + * 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; } _ Patches currently in -mm which might be from leitao@debian.org are mm-kmemleak-avoid-soft-lockup-when-scanning-task-stacks.patch mm-kmemleak-stop-the-task-stack-scan-early-when-interrupted.patch mm-kmemleak-stop-the-per-cpu-and-struct-page-scans-early-too.patch mm-memory-failure-drop-dead-error_states-entry-for-reserved-pages.patch mm-memory-failure-surface-unhandlable-kernel-pages-as-enotrecoverable.patch mm-memory-failure-report-mf_msg_kernel-for-unrecoverable-kernel-pages.patch mm-memory-failure-add-panic-option-for-unrecoverable-pages.patch documentation-document-panic_on_unrecoverable_memory_failure-sysctl.patch selftests-mm-add-hwpoison-panic-destructive-test.patch