tree e89161188d2a485e428e9aa61690517418f75952
parent b73413647ee36406561618f68d0661d49dc47489
author Konstantin Khlebnikov <khlebnikov@yandex-team.ru> 1461885543 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1461897244 -0700

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

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

n-horiguchi said: without this recheck, the race causes kernel to pin an
irrelevant page, and finally makes kernel crash for refcount mismatch.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Acked-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>