The patch titled Subject: mm/memory-failure: fix redundant updates for already poisoned pages has been added to the -mm mm-hotfixes-unstable branch. Its filename is mm-memory-failure-fix-redundant-updates-for-already-poisoned-pages.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: Kyle Meyer kyle.meyer@hpe.com Subject: mm/memory-failure: fix redundant updates for already poisoned pages Date: Thu, 28 Aug 2025 13:38:20 -0500

Duplicate memory errors can be reported by multiple sources.

Passing an already poisoned page to action_result() causes issues:

* The amount of hardware corrupted memory is incorrectly updated. * Per NUMA node MF stats are incorrectly updated. * Redundant "already poisoned" messages are printed.

Avoid those issues by:

* Skipping hardware corrupted memory updates for already poisoned pages. * Skipping per NUMA node MF stats updates for already poisoned pages. * Dropping redundant "already poisoned" messages.

Make MF_MSG_ALREADY_POISONED consistent with other action_page_types and make calls to action_result() consistent for already poisoned normal pages and huge pages.

Link: https://lkml.kernel.org/r/aLCiHMy12Ck3ouwC@hpe.com Fixes: b8b9488d50b7 ("mm/memory-failure: improve memory failure action_result messages") Signed-off-by: Kyle Meyer kyle.meyer@hpe.com Reviewed-by: Jiaqi Yan jiaqiyan@google.com Acked-by: David Hildenbrand david@redhat.com Cc: Borislav Betkov bp@alien8.de Cc: Jane Chu jane.chu@oracle.com Cc: Kyle Meyer kyle.meyer@hpe.com Cc: Liam Howlett liam.howlett@oracle.com Cc: Lorenzo Stoakes lorenzo.stoakes@oracle.com Cc: "Luck, Tony" tony.luck@intel.com Cc: Miaohe Lin linmiaohe@huawei.com Cc: Michal Hocko mhocko@suse.com Cc: Mike Rapoport rppt@kernel.org Cc: Naoya Horiguchi nao.horiguchi@gmail.com Cc: Oscar Salvador osalvador@suse.de Cc: Russ Anderson russ.anderson@hpe.com Cc: Suren Baghdasaryan surenb@google.com Cc: Vlastimil Babka vbabka@suse.cz Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

mm/memory-failure.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-)

--- a/mm/memory-failure.c~mm-memory-failure-fix-redundant-updates-for-already-poisoned-pages +++ a/mm/memory-failure.c @@ -956,7 +956,7 @@ static const char * const action_page_ty [MF_MSG_BUDDY] = "free buddy page", [MF_MSG_DAX] = "dax page", [MF_MSG_UNSPLIT_THP] = "unsplit thp", - [MF_MSG_ALREADY_POISONED] = "already poisoned", + [MF_MSG_ALREADY_POISONED] = "already poisoned page", [MF_MSG_UNKNOWN] = "unknown page", };

@@ -1349,9 +1349,10 @@ static int action_result(unsigned long p { trace_memory_failure_event(pfn, type, result);

- num_poisoned_pages_inc(pfn); - - update_per_node_mf_stats(pfn, result); + if (type != MF_MSG_ALREADY_POISONED) { + num_poisoned_pages_inc(pfn); + update_per_node_mf_stats(pfn, result); + }

pr_err("%#lx: recovery action for %s: %s\n", pfn, action_page_types[type], action_name[result]); @@ -2094,12 +2095,11 @@ retry: *hugetlb = 0; return 0; } else if (res == -EHWPOISON) { - pr_err("%#lx: already hardware poisoned\n", pfn); if (flags & MF_ACTION_REQUIRED) { folio = page_folio(p); res = kill_accessing_process(current, folio_pfn(folio), flags); - action_result(pfn, MF_MSG_ALREADY_POISONED, MF_FAILED); } + action_result(pfn, MF_MSG_ALREADY_POISONED, MF_FAILED); return res; } else if (res == -EBUSY) { if (!(flags & MF_NO_RETRY)) { @@ -2285,7 +2285,6 @@ try_again: goto unlock_mutex;

if (TestSetPageHWPoison(p)) { - pr_err("%#lx: already hardware poisoned\n", pfn); res = -EHWPOISON; if (flags & MF_ACTION_REQUIRED) res = kill_accessing_process(current, pfn, flags); _

Patches currently in -mm which might be from kyle.meyer@hpe.com are

mm-memory-failure-fix-redundant-updates-for-already-poisoned-pages.patch