From: Muchun Song <songmuchun@bytedance.com>
To: mike.kravetz@oracle.com, akpm@linux-foundation.org
Cc: n-horiguchi@ah.jp.nec.com, ak@linux.intel.com, mhocko@suse.cz,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Muchun Song <songmuchun@bytedance.com>,
Michal Hocko <mhocko@suse.com>,
stable@vger.kernel.org
Subject: [PATCH v3 6/6] mm: hugetlb: remove VM_BUG_ON_PAGE from page_huge_active
Date: Sun, 10 Jan 2021 20:40:17 +0800 [thread overview]
Message-ID: <20210110124017.86750-7-songmuchun@bytedance.com> (raw)
In-Reply-To: <20210110124017.86750-1-songmuchun@bytedance.com>
The page_huge_active() can be called from scan_movable_pages() which
do not hold a reference count to the HugeTLB page. So when we call
page_huge_active() from scan_movable_pages(), the HugeTLB page can
be freed parallel. Then we will trigger a BUG_ON which is in the
page_huge_active() when CONFIG_DEBUG_VM is enabled. Just remove the
VM_BUG_ON_PAGE.
Fixes: 7e1f049efb86 ("mm: hugetlb: cleanup using paeg_huge_active()")
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: stable@vger.kernel.org
---
mm/hugetlb.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index e7ed30afbb8f..5940bf0c49b9 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1360,8 +1360,7 @@ struct hstate *size_to_hstate(unsigned long size)
*/
bool page_huge_active(struct page *page)
{
- VM_BUG_ON_PAGE(!PageHuge(page), page);
- return PageHead(page) && PagePrivate(&page[1]);
+ return PageHeadHuge(page) && PagePrivate(&page[1]);
}
/* never called for tail page */
--
2.11.0
prev parent reply other threads:[~2021-01-10 12:43 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-10 12:40 [PATCH v3 0/6] Fix some bugs about HugeTLB code Muchun Song
2021-01-10 12:40 ` [PATCH v3 1/6] mm: migrate: do not migrate HugeTLB page whose refcount is one Muchun Song
2021-01-12 9:42 ` Michal Hocko
2021-01-12 9:43 ` [External] " Muchun Song
2021-01-12 11:00 ` David Hildenbrand
2021-01-12 11:11 ` David Hildenbrand
2021-01-12 11:27 ` Michal Hocko
2021-01-12 11:34 ` David Hildenbrand
2021-01-12 12:16 ` Michal Hocko
2021-01-12 14:23 ` Michal Hocko
2021-01-12 14:41 ` David Hildenbrand
2021-01-12 14:53 ` Michal Hocko
2021-01-12 20:12 ` Mike Kravetz
2021-01-12 13:40 ` [External] " Muchun Song
2021-01-12 13:51 ` David Hildenbrand
2021-01-12 14:17 ` Muchun Song
2021-01-12 14:28 ` David Hildenbrand
2021-01-12 14:59 ` Muchun Song
2021-01-10 12:40 ` [PATCH v3 2/6] mm: hugetlbfs: fix cannot migrate the fallocated HugeTLB page Muchun Song
2021-01-11 23:04 ` Mike Kravetz
2021-01-12 9:45 ` Michal Hocko
2021-01-10 12:40 ` [PATCH v3 3/6] mm: hugetlb: fix a race between freeing and dissolving the page Muchun Song
2021-01-12 1:06 ` Mike Kravetz
2021-01-12 10:02 ` Michal Hocko
2021-01-12 10:13 ` [External] " Muchun Song
2021-01-12 11:17 ` Michal Hocko
2021-01-12 11:43 ` Muchun Song
2021-01-12 12:37 ` Michal Hocko
2021-01-12 15:05 ` Muchun Song
2021-01-10 12:40 ` [PATCH v3 4/6] mm: hugetlb: add return -EAGAIN for dissolve_free_huge_page Muchun Song
2021-01-12 1:20 ` Mike Kravetz
2021-01-12 8:33 ` Michal Hocko
2021-01-12 9:51 ` [External] " Muchun Song
2021-01-12 10:06 ` Michal Hocko
2021-01-12 10:49 ` Muchun Song
2021-01-12 11:11 ` Michal Hocko
2021-01-12 11:34 ` Muchun Song
2021-01-10 12:40 ` [PATCH v3 5/6] mm: hugetlb: fix a race between isolating and freeing page Muchun Song
2021-01-10 12:40 ` Muchun Song [this message]
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