From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f201.google.com (mail-pl1-f201.google.com [209.85.214.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AA1DA3D9022 for ; Wed, 8 Apr 2026 17:26:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775669176; cv=none; b=JGFjgNARV5cPorFm/N7zNvjc9OAoAxV/juj9gQwbLDOvd+9bPw+TMQNesgXURR3kAlGl8SWWkbcJbner+ytPZNwEUjYhJIJBpgCTOmGLaRc5HSKu7QiRUET6DjA7+qMwKLDEEzyf6xBcjkVOGKuI0at6nEFPlz84Y775UEFhdSU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775669176; c=relaxed/simple; bh=ko2N+a8bmW24/l4K/at+f1QHh6ITswHFEAcwikZm7g8=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=VUNJee3gAmcO9iiEaFnKMKga6Mn0VTokjRzkd+63Pi+txW5g0XRv/REqNGbzZ79Rkwp0tNCRokZ+E1XzbKwNJhCZX9zPajLsd5/wOC5nCD/8UCKixA4ZYdI94e8fK++LeYCSSHWrk/+6wdfd4tnqGxgdze+LRwZ/UHwWDvLCDsU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--wyihan.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=aOqJhO9M; arc=none smtp.client-ip=209.85.214.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--wyihan.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="aOqJhO9M" Received: by mail-pl1-f201.google.com with SMTP id d9443c01a7336-2b23af7d7e8so2367005ad.0 for ; Wed, 08 Apr 2026 10:26:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1775669173; x=1776273973; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=pPHYp8i7UG9LnNHrv4AlFKYXMB/HImkpdvlYCa2u69A=; b=aOqJhO9MvY2+lVizoNWvmo9CmAb6H0Mf/FePghLYJ5p8VhX55Yc0qmBnedRc6w72Os FiifERRatnO5PwBVSS1qr7HHAI5guMT4KhMpuboOGhdA5BF/sbnkl/uaC1imBUC+CjkW /cxo0frtMyznTBovnntgJJcsNucKGsVquce7Phq/Fhf6tMZfANNMm8V7Aql1CPjDIR/c cV7mgLITMKFOuCPdBGvt1PjChrf1BGojwMiHBgje/hyam4j6z2kDZzE6hh0u601mJH44 P5iGmQZY84BgGp52QabTYEi5wvWw51emcsx+6b22ClcgPFS6efpCgncx90wMASLtgpF8 wmUg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775669173; x=1776273973; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=pPHYp8i7UG9LnNHrv4AlFKYXMB/HImkpdvlYCa2u69A=; b=E5xXRPhqfIkBe6+pQ2/5n6HXaXKBotUCsv3lOwCyA293t27KvtYVGnxarv9QoYTDDE ff4ybGZuCqbhYy8HAonFb/FaG/r4PXHpDg423RgcyHI1kvfUuGiStNtkwAd65LE+M4+A Qc0kXOdD49S6hom8tlkGg2E/SEGzA+vf5rw5xeZYz5yyG3j7edmnGR2QDk/ypOUTCdkR g/GZLdCs8LdJyArDImtCSikjTLgA5/KGEIFoJSHT3taIAiRVO3euVPiEXN+icz6WLHKi qe04Z5q7CITmLzVB77GNLDgTQ+wl+17/lEhmYSdyyJ2pl34wsbTmoA86ERaZb0tkVnqH qBfA== X-Forwarded-Encrypted: i=1; AJvYcCUVmPNO3rINQqf77PRezmO99nl6BE/xFvWnwVACGtqw97RAqGCuQcC4Df91G0yYfWMKKL8fQ0+wt0pLvZs=@vger.kernel.org X-Gm-Message-State: AOJu0YyeoMLDn5XrTBZ+PPWigBX+veIU8kzHMfJZGt5Rkbyx+3XCCdNx miblO1RM7zTnYJTh56cG01GCgby/O3zdsAvIpAZ69YGdQuh2/PsqNg0g0h1rtZwRQRp//mPPwNr TwZvACA== X-Received: from plpa9.prod.google.com ([2002:a17:902:9009:b0:2b2:45d8:c606]) (user=wyihan job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:3845:b0:2b0:c451:ae8a with SMTP id d9443c01a7336-2b2818521c1mr229989525ad.13.1775669172881; Wed, 08 Apr 2026 10:26:12 -0700 (PDT) Date: Wed, 08 Apr 2026 17:24:43 +0000 In-Reply-To: <20260408-memory-failure-mf-delayed-fix-rfc-v3-v3-0-718f45eb7c75@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260408-memory-failure-mf-delayed-fix-rfc-v3-v3-0-718f45eb7c75@google.com> X-Developer-Key: i=wyihan@google.com; a=ed25519; pk=cRi0fKzS5BMxlHyHY2pJv3w/1zcgfYKr6EYGYppdMYc= X-Developer-Signature: v=1; a=ed25519-sha256; t=1775669168; l=1569; i=wyihan@google.com; s=20260319; h=from:subject:message-id; bh=ko2N+a8bmW24/l4K/at+f1QHh6ITswHFEAcwikZm7g8=; b=746PglFeH+OYu3l4MYzApNvi5cX7gmzFI+EH+QoQQGSI/WNdWDeTfTggu2aYEOF1AvAm4+CiO zbTdbLNvjMSDyUKybAzt3rRp24Zt8lyV82pf0BtA3Q4mEZHunp1EjUN X-Mailer: b4 0.14.3 Message-ID: <20260408-memory-failure-mf-delayed-fix-rfc-v3-v3-2-718f45eb7c75@google.com> Subject: [PATCH RFC v3 2/7] mm: memory_failure: Allow truncate_error_folio to return MF_DELAYED From: Lisa Wang To: Miaohe Lin , Naoya Horiguchi , Andrew Morton , Paolo Bonzini , Shuah Khan , Hugh Dickins , Baolin Wang , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: rientjes@google.com, seanjc@google.com, ackerleytng@google.com, vannapurve@google.com, michael.roth@amd.com, jiaqiyan@google.com, tabba@google.com, dave.hansen@linux.intel.com, Lisa Wang Content-Type: text/plain; charset="utf-8" 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. Signed-off-by: Lisa Wang --- mm/memory-failure.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 2e53b3024391..fd9ed2cd761d 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -941,7 +941,9 @@ static int truncate_error_folio(struct folio *folio, unsigned long pfn, 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); -- 2.53.0.1213.gd9a14994de-goog