Messages in this thread Patch in this message | | | From | Naoya Horiguchi <> | Subject | [PATCH v1] hugetlb: pass head page to remove_hugetlb_page() | Date | Thu, 27 May 2021 08:52:57 +0900 |
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From: Naoya Horiguchi <naoya.horiguchi@nec.com>
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.
Fixes: 6eb4e88a6d27 ("hugetlb: create remove_hugetlb_page() to separate functionality") Signed-off-by: Naoya Horiguchi <naoya.horiguchi@nec.com> --- mm/hugetlb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git v5.13-rc3/mm/hugetlb.c v5.13-rc3_patched/mm/hugetlb.c index 95918f410c0f..470f7b5b437e 100644 --- v5.13-rc3/mm/hugetlb.c +++ v5.13-rc3_patched/mm/hugetlb.c @@ -1793,7 +1793,7 @@ int dissolve_free_huge_page(struct page *page) 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); -- 2.25.1
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