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a=ed25519; pk=cRi0fKzS5BMxlHyHY2pJv3w/1zcgfYKr6EYGYppdMYc= X-Developer-Signature: v=1; a=ed25519-sha256; t=1787514072; l=2009; i=wyihan@google.com; s=20260319; h=from:subject:message-id; bh=DG04WuEmB+N8qtRetaF/4g/eNDjDsfwar1GsdNmj7GI=; b=l3Mv9NFzVojO4X30lik/YxnXTp8odsky55GCF49Ybs0TwqNB3EpJZR4IWtMFjUh+RZrz/DSlr kyCzx6aZvHqDNzH3hGWJjzxiWsVRAHFhzpzByW10l57CWxucdyf1HjT X-Mailer: b4 0.14.3 Message-ID: <20260823-memory-failure-mf-delayed-fix-v5-2-d97a5703e45a@google.com> Subject: [PATCH v5 2/5] 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 , 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, Andi Kleen , Hidehiro Kawai , Rik van Riel , Yu Zhang , Lorenzo Stoakes , "Liam R. Howlett" 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 , Isaku Yamahata , Xiaoyao Li Content-Type: text/plain; charset="utf-8" X-Rspam-User: X-Rspamd-Queue-Id: 599E8100005 X-Rspamd-Server: rspam07 X-Stat-Signature: 1quygknqh4q5amzj4zmtx3qe86f6e1y3 X-HE-Tag: 1787514076-711285 X-HE-Meta: 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 SK1Whnk9 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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. Acked-by: David Hildenbrand (Arm) Acked-by: Miaohe Lin Reviewed-by: Ackerley Tng 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 --- mm/memory-failure.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index e698d0e9711d..37ea23489b75 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -939,10 +939,12 @@ 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); + pr_info("%#lx: Failed to release buffers\n", pfn); else ret = MF_RECOVERED; } else { -- 2.55.0.766.g2966f0265a-goog