The patch titled
Subject: hugetlb: pass head page to remove_hugetlb_page()
has been added to the -mm tree. Its filename is
hugetlb-pass-head-page-to-remove_hugetlb_page.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/hugetlb-pass-head-page-to-remove_hugetlb_page.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/hugetlb-pass-head-page-to-remove_hugetlb_page.patch
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------------------------------------------------------
From: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
Subject: hugetlb: pass head page to remove_hugetlb_page()
When memory_failure() or soft_offline_page() is called on a tail page of
some hugetlb page, "BUG: unable to handle page fault" error can be
triggered.
remove_hugetlb_page() dereferences page->lru, so it's assumed that the
page points to a head page, but one of the caller,
dissolve_free_huge_page(), provides remove_hugetlb_page() with 'page'
which could be a tail page. So pass 'head' to it, instead.
Link: https://lkml.kernel.org/r/20210526235257.2769473-1-nao.horiguchi@xxxxxxxxx
Fixes: 6eb4e88a6d27 ("hugetlb: create remove_hugetlb_page() to separate functionality")
Signed-off-by: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/hugetlb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/hugetlb.c~hugetlb-pass-head-page-to-remove_hugetlb_page
+++ a/mm/hugetlb.c
@@ -1832,7 +1832,7 @@ retry:
SetPageHWPoison(page);
ClearPageHWPoison(head);
}
- remove_hugetlb_page(h, page, false);
+ remove_hugetlb_page(h, head, false);
h->max_huge_pages--;
spin_unlock_irq(&hugetlb_lock);
update_and_free_page(h, head);
_
Patches currently in -mm which might be from naoya.horiguchi@xxxxxxx are
hugetlb-pass-head-page-to-remove_hugetlb_page.patch
mmhwpoison-send-sigbus-with-error-virutal-address.patch
