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

[Kirill A. Shutemov]

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(-)

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2.7.0