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| author |   Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> | 2016-11-10 10:46:23 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2016-11-11 08:12:37 -0800 |
| commit | c3901e722b2975666f42748340df798114742d6d (patch) | |
| tree | 9cd4508bd975e35b393982f3c61101c98c90dee6 /include/linux | |
| parent | swapfile: fix memory corruption via malformed swapfile (diff) | |
| download | linux-dev-c3901e722b2975666f42748340df798114742d6d.tar.xz linux-dev-c3901e722b2975666f42748340df798114742d6d.zip | |
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>
Diffstat (limited to 'include/linux')
0 files changed, 0 insertions, 0 deletions