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 1F59849E14C for ; Thu, 17 Sep 2026 23:57:25 +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=1789689448; cv=none; b=ZZiXvIhxQsx2wzQzRWOZq2CU1lXPc3QZ4VUo/QjMPytEU8LjyFJ20TPtk/nZBL9cjjL/fi466RyrawHFYaFY9HyYJu3Uex/EqHd0iIfveEvropOFpPR/BwzWbh4UNQi+5PA1fRexnHHXSk8nFOtSmx/rsvxf5A1GNTTgs5HKBA8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789689448; c=relaxed/simple; bh=/gC8n4aYBIeaZ+yt5/B+Bi9R20A84dv8fGViXjSkwDA=; h=Date:To:From:Subject:Message-Id; b=slERk+7T2AoNr1ysoP3mKtPVDK/xO6ghD6Kdk0EuSA+yMm3IchyJ0zbQAqTiNl/OSDM45X1Ouvbqb44cIgzqJ4oxHQeSNPllNOIl+bYT5+08lyDjCokJ5Nf/Wl+pAAcJIoQFeJaG3LZvx5QglBdPGQAEZxO/ZjfzcC278+Z3u5A= 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=d6DwPppp; 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="d6DwPppp" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9F3811F00893; Thu, 17 Sep 2026 23:57:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1789689445; bh=/Lx0kx/9r6K4ay4Ju+u9D62j+KzKnyS1PlRfPp68c/Y=; h=Date:To:From:Subject; b=d6DwPpppDYa0iXi80iaFcusE7McLAfiAswN6pTEdCrGm0Ff1DJsM48jScHpDjrkDv Fm7g4CziGlApRYey0yK6pl0esj3GOFIixQeTxpWUTNeHygYMqBo5F8Mla1yoKN6gyJ wwgF2ZFZy4MSk4cXYv7yHdgv2tJF9msaI07PgjGI= Date: Thu, 17 Sep 2026 16:57:25 -0700 To: mm-commits@vger.kernel.org,wyihan@google.com,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-memory_failure-allow-truncate_error_folio-to-return-mf_delayed.patch added to mm-new branch Message-Id: <20260917235725.9F3811F00893@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: Allow truncate_error_folio to return MF_DELAYED has been added to the -mm mm-new branch. Its filename is mm-memory_failure-allow-truncate_error_folio-to-return-mf_delayed.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-allow-truncate_error_folio-to-return-mf_delayed.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: Lisa Wang Subject: mm: memory_failure: Allow truncate_error_folio to return MF_DELAYED Date: Thu, 17 Sep 2026 20:43:48 +0000 The .error_remove_folio a_ops is used by different filesystems to handle folio truncation upon discovery of a memory failure in the memory associated with the given folio. Currently, MF_DELAYED is treated as an error, causing "Failed to punch page" to be written to the console. MF_DELAYED is then relayed to the caller of truncate_error_folio() as MF_FAILED. This further causes memory_failure() to return -EBUSY, which then always causes a SIGBUS. This is also implies that regardless of whether the thread's memory corruption kill policy is PR_MCE_KILL_EARLY or PR_MCE_KILL_LATE, a memory failure with MF_DELAYED will always cause a SIGBUS. Update truncate_error_folio() to return MF_DELAYED to the caller if the .error_remove_folio() callback reports MF_DELAYED. Link: https://lore.kernel.org/20260917-memory-failure-mf-delayed-fix-v6-2-4b00856b5364@google.com Fixes: 6a46079cf57a ("HWPOISON: The high level memory error handler in the VM v7") Fixes: a7800aa80ea4 ("KVM: Add KVM_CREATE_GUEST_MEMFD ioctl() for guest-specific backing memory") Signed-off-by: Lisa Wang Signed-off-by: Andrew Morton Acked-by: David Hildenbrand (Arm) Acked-by: Miaohe Lin Reviewed-by: Ackerley Tng Cc: Andi Kleen Cc: Baolin Wang Cc: Dave Hansen Cc: David Rientjes Cc: Fuad Tabba Cc: Hidehiro Kawai Cc: Hugh Dickins Cc: Isaku Yamahata Cc: Jiaqi Yan Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Michael Roth Cc: Michal Hocko Cc: Mike Rapoport Cc: Naoya Horiguchi Cc: Paolo Bonzini Cc: Rik van Riel Cc: Sean Christopherson Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Vishal Annapurve Cc: Vlastimil Babka Cc: Xiaoyao Li Cc: Yu Zhang --- mm/memory-failure.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/mm/memory-failure.c~mm-memory_failure-allow-truncate_error_folio-to-return-mf_delayed +++ a/mm/memory-failure.c @@ -939,10 +939,12 @@ static int truncate_error_folio(struct f if (mapping->a_ops->error_remove_folio) { int err = mapping->a_ops->error_remove_folio(mapping, folio); - if (err != 0) + if (err == MF_DELAYED) + ret = err; + else if (err != 0) pr_info("%#lx: Failed to punch page: %d\n", pfn, err); else if (!filemap_release_folio(folio, GFP_NOIO)) - pr_info("%#lx: failed to release buffers\n", pfn); + pr_info("%#lx: Failed to release buffers\n", pfn); else ret = MF_RECOVERED; } else { _ Patches currently in -mm which might be from wyihan@google.com are mm-memory_failure-clarify-the-mf_delayed-definition.patch mm-memory_failure-allow-truncate_error_folio-to-return-mf_delayed.patch mm-shmem-update-shmem-handler-to-the-mf_delayed-definition.patch mm-memory_failure-generalize-extra_pins-handling-to-all-mf_delayed-cases.patch mm-selftests-add-shmem-into-memory-failure-test.patch