Jane Chu 813c51bc25 mm/memory-failure: teach kill_accessing_process to accept hugetlb tail page pfn ...

commit 057a6f2632 upstream.

When a hugetlb folio is being poisoned again, try_memory_failure_hugetlb()
passed head pfn to kill_accessing_process(), that is not right.  The
precise pfn of the poisoned page should be used in order to determine the
precise vaddr as the SIGBUS payload.

This issue has already been taken care of in the normal path, that is,
hwpoison_user_mappings(), see [1][2].  Further more, for [3] to work
correctly in the hugetlb repoisoning case, it's essential to inform VM the
precise poisoned page, not the head page.

[1] https://lkml.kernel.org/r/20231218135837.3310403-1-willy@infradead.org
[2] https://lkml.kernel.org/r/20250224211445.2663312-1-jane.chu@oracle.com
[3] https://lore.kernel.org/lkml/20251116013223.1557158-1-jiaqiyan@google.com/

Link: https://lkml.kernel.org/r/20260120232234.3462258-2-jane.chu@oracle.com
Signed-off-by: Jane Chu <jane.chu@oracle.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Acked-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Chris Mason <clm@meta.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Jiaqi Yan <jiaqiyan@google.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: William Roche <william.roche@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2026-02-06 16:55:47 +01:00

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