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AJvYcCWfUeDfvceeAcI0wrNhkkbzfLyfy5d+rDFGLRVDzuFCWnu5YNAwy5sDX5y2UDkV4pxHny2wuwz7qg==@kvack.org X-Gm-Message-State: AOJu0YzFyxaEmHxPd8Vc4loII1lbTFU+7Bmti4r1RK6vCyXW/yU7RqI7 ljSzT0DWfm7bgz/QMhTWz/jnkk9sS/reEn9/fvtYylzI3IOxQuJ0f5WYcJI19aJUa8FSB/Sqyud kduhZ/w== X-Received: from pger18.prod.google.com ([2002:a63:a012:0:b0:c75:bd4a:f509]) (user=wyihan job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a20:7d9e:b0:398:f1ed:7fa3 with SMTP id adf61e73a8af0-39bcec301e7mr930308637.57.1773963057622; Thu, 19 Mar 2026 16:30:57 -0700 (PDT) Date: Thu, 19 Mar 2026 23:30:29 +0000 In-Reply-To: <20260319-memory-failure-mf-delayed-fix-rfc-v2-v2-0-92c596402a7a@google.com> Mime-Version: 1.0 References: <20260319-memory-failure-mf-delayed-fix-rfc-v2-v2-0-92c596402a7a@google.com> X-Developer-Key: i=wyihan@google.com; a=ed25519; pk=cRi0fKzS5BMxlHyHY2pJv3w/1zcgfYKr6EYGYppdMYc= X-Developer-Signature: v=1; a=ed25519-sha256; t=1773963053; l=1473; i=wyihan@google.com; s=20260319; h=from:subject:message-id; bh=bEQvMaA9O2hDkO+lF+QBqIJNJg07ecLAkODpS+u5iOg=; b=13DaSlI9UabzaKWe4h2fh2HtJjjXwRHu/w4sC/PfYfQR83rUFlAnEp/P6cSUes8BAsTQjFGZ7 scwG/rZVGLFDn5Cdb0QuA+zOHJK4OdPK+rIY+aD7esoRAD8+cY0a+dy X-Mailer: b4 0.14.3 Message-ID: <20260319-memory-failure-mf-delayed-fix-rfc-v2-v2-2-92c596402a7a@google.com> Subject: [PATCH RFC v2 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" X-Stat-Signature: 8ju1hp7tjakmbrzq6zx5biecrjwfzw8t X-Rspamd-Server: rspam09 X-Rspam-User: X-Rspamd-Queue-Id: EA543A000E X-HE-Tag: 1773963058-414389 X-HE-Meta: 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 z1/OZxWK 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 4f143334d5a1..57f7762e7418 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -941,6 +941,8 @@ 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 == MF_DELAYED) + return err; if (err != 0) pr_info("%#lx: Failed to punch page: %d\n", pfn, err); else if (!filemap_release_folio(folio, GFP_NOIO)) -- 2.53.0.959.g497ff81fa9-goog