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05 April 2024, 19:05:47 UTC
Revision c3901e722b2975666f42748340df798114742d6d authored by Naoya Horiguchi on 10 November 2016, 18:46:23 UTC, committed by Linus Torvalds on 11 November 2016, 16:12:37 UTC 
mm: hwpoison: fix thp split handling in memory_failure()
 
When memory_failure() runs on a thp tail page after pmd is split, we
trigger the following VM_BUG_ON_PAGE():

   page:ffffd7cd819b0040 count:0 mapcount:0 mapping:         (null) index:0x1
   flags: 0x1fffc000400000(hwpoison)
   page dumped because: VM_BUG_ON_PAGE(!page_count(p))
   ------------[ cut here ]------------
   kernel BUG at /src/linux-dev/mm/memory-failure.c:1132!

memory_failure() passed refcount and page lock from tail page to head
page, which is not needed because we can pass any subpage to
split_huge_page().

Fixes: 61f5d698cc97 ("mm: re-enable THP")
Link: http://lkml.kernel.org/r/1477961577-7183-1-git-send-email-n-horiguchi@ah.jp.nec.com
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: <stable@vger.kernel.org>	[4.5+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent dd111be
History
Tip revision: c3901e722b2975666f42748340df798114742d6d authored by Naoya Horiguchi on 10 November 2016, 18:46:23 UTC
mm: hwpoison: fix thp split handling in memory_failure()
Tip revision: c3901e7
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