linux-kernel - [PATCH 0/2] Fix another VM_BUG_ON_PAGE(PageTail(page)) on mbind(2)

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Message-Id: <1454333169-121369-1-git-send-email-kirill.shutemov@linux.intel.com>
Date:	Mon,  1 Feb 2016 16:26:07 +0300
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	Vlastimil Babka <vbabka@...e.cz>,
	David Rientjes <rientjes@...gle.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Michal Hocko <mhocko@...e.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 0/2] Fix another VM_BUG_ON_PAGE(PageTail(page)) on mbind(2)

Dmitry Vyukov reported yet another VM_BUG_ON_PAGE(PageTail(page)) bug from
isolate_lru_page().

The first patch relaxes VM_BUG_ON_PAGE(): no need to crash on tail pages
which are not on LRU. We are not going to isolate them anyway.

The second patch tries streamline logic within queue_pages_range(): no
need to scan non migratable VMAs. The patch requires more careful review.

Any of these patches should fix the issue. I think both should be applied.
The first one is subject for 4.5 as the bogus was introduced there.

Kirill A. Shutemov (2):
  mm: fix bogus VM_BUG_ON_PAGE() in isolate_lru_page()
  mempolicy: do not try to queue pages from !vma_migratable()

 mm/mempolicy.c | 14 +++++---------
 mm/vmscan.c    |  2 +-
 2 files changed, 6 insertions(+), 10 deletions(-)

-- 
2.7.0