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| author | Jianguo Wu <wujianguo@huawei.com> | 2013-12-19 02:08:54 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-12-19 04:04:52 +0100 |
| commit | a49ecbcd7b0d5a1cda7d60e03df402dd0ef76ac8 (patch) | |
| tree | 540f25e983c0ae135d94a7bd9e5e0008844ca19a /mm/huge_memory.c | |
| parent | mm/compaction: respect ignore_skip_hint in update_pageblock_skip (diff) | |
| download | linux-a49ecbcd7b0d5a1cda7d60e03df402dd0ef76ac8.tar.xz linux-a49ecbcd7b0d5a1cda7d60e03df402dd0ef76ac8.zip | |
mm/memory-failure.c: recheck PageHuge() after hugetlb page migrate successfully
After a successful hugetlb page migration by soft offline, the source
page will either be freed into hugepage_freelists or buddy(over-commit
page). If page is in buddy, page_hstate(page) will be NULL. It will
hit a NULL pointer dereference in dequeue_hwpoisoned_huge_page().
BUG: unable to handle kernel NULL pointer dereference at 0000000000000058
IP: [<ffffffff81163761>] dequeue_hwpoisoned_huge_page+0x131/0x1d0
PGD c23762067 PUD c24be2067 PMD 0
Oops: 0000 [#1] SMP
So check PageHuge(page) after call migrate_pages() successfully.
Signed-off-by: Jianguo Wu <wujianguo@huawei.com>
Tested-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/huge_memory.c')
0 files changed, 0 insertions, 0 deletions