On Wed 14-12-16 13:29:56, Ian Jackson wrote:

osstest service owner writes ("[linux-3.18 bisection] complete test-amd64-amd64-xl-qemut-win7-amd64"):

quoted

*** Found and reproduced problem changeset ***

  Bug is in tree:  linux git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
  Bug introduced:  a2d8c514753276394d68414f563591f174ef86cb
  Bug not present: 8f620446135b64ca6f96cf32066a76d64e79a388
  Last fail repro: http://logs.test-lab.xenproject.org/osstest/logs/103315/

  commit a2d8c514753276394d68414f563591f174ef86cb
  Author: Lukasz Odzioba [off-list ref]
  Date:   Fri Jun 24 14:50:01 2016 -0700
  
      mm/swap.c: flush lru pvecs on compound page arrival

This commit breaks the test "test-amd64-amd64-xl-qemut-win7-amd64" in
the Xen Project CI system.

Ohh, I can see it now. This is not an upstream commit. This is a 3.18.37
backport which was wrong! You need the follow up fix 52c84a95dc6a
("4.1.28 Fix bad backport of 8f182270dfec "mm/swap.c: flush lru pvecs on
compound page arrival""). The primary problem was that __lru_cache_add
has leaked pages which would explain your OOM.
-- 
Michal Hocko
SUSE Labs