Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1381623

[PATCH] mm/memory-failure: fix race with compound page split/merge

Show all headers | View raw

Get_hwpoison_page() must recheck relation between head and tail pages.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
---
 mm/memory-failure.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 78f5f2641b91..ca5acee53b7a 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -888,7 +888,15 @@ int get_hwpoison_page(struct page *page)
 		}
 	}
 
-	return get_page_unless_zero(head);
+	if (get_page_unless_zero(head)) {
+		if (head == compound_head(page))
+			return 1;
+
+		pr_info("MCE: %#lx cannot catch tail\n", page_to_pfn(page));
+		put_page(head);
+	}
+
+	return 0;
 }
 EXPORT_SYMBOL_GPL(get_hwpoison_page);
 

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

[PATCH] mm/memory-failure: fix race with compound page split/merge Konstantin Khlebnikov <khlebnikov@yandex-team.ru> - 2016-04-18 13:50 +0200
  Re: [PATCH] mm/memory-failure: fix race with compound page  split/merge Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> - 2016-04-19 01:20 +0200
    Re: [PATCH] mm/memory-failure: fix race with compound page split/merge Konstantin Khlebnikov <koct9i@gmail.com> - 2016-04-19 08:00 +0200
    Re: [PATCH] mm/memory-failure: fix race with compound page  split/merge Andrew Morton <akpm@linux-foundation.org> - 2016-04-22 01:50 +0200

csiph-web