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We are seeing this on multiple servers after upgrading from previous
4.10 series HWE kernels to the new 4.13 HWE series. With the new kernel,
free memory is continously decreasing at a high rate and the servers
start swapping and finally OOMing services within days. With the 4.10
kernel, decrease of free memory is slower and stabilizes after a while.

Latest kernel tested is linux-image-4.13.0-32-generic but the issue also
affects older kernels from that series, tested back to linux-
image-4.13.0-19-generic. No issue with linux-image-4.10.0-42-generic.

The servers are running as OpenStack controller nodes using either Ocata
or Pike UCA plus ceph. See attached graph for the memory behaviour.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.13.0-32-generic 4.13.0-32.35~16.04.1
ProcVersionSignature: Ubuntu 4.13.0-32.35~16.04.1-generic 4.13.13
Uname: Linux 4.13.0-32-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
Date: Fri Feb  9 09:45:50 2018
ProcEnviron:
 LANGUAGE=en_US:
 TERM=screen
 PATH=(custom, no user)
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: linux-hwe
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug third-party-packages xenial
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Servers going OOM after updating kernel from 4.10 to 4.13
https://bugs.launchpad.net/bugs/1748408
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