Public bug reported:
Following update from kernel 4.13.0-32-generic to 4.13.0-36-generic, my
Hyper-V 2012 R2 hosted Ubunntu servers experienced problems with memory
allocation--they reported total assigned memory less than the initial
allocation of the dynamic memory configuration, corresponding with 98%
memory utilization and over 35 load average.
I was able to boot back to 4.13.0-32-generic, and the issue went away.
I was also able to resolve the issue by changing the servers from
dynamic memory allocations (512 initial 4096 max) to static memory
allocations (4096 static).
Sar memory snapshots as follows, only change was kernel booted:
Linux 4.13.0-36-generic (servername) 03/01/2018 _x86_64_ (4 CPU)
09:14:34 AM kbmemfree kbmemused %memused kbbuffers kbcached kbcommit
%commit kbactive kbinact kbdirty
09:14:35 AM 6312 409676 98.48 1528 28696 2416712
257.02 37948 46976 28
09:14:36 AM 7268 408720 98.25 1368 27944 2418800
257.24 38360 45096 124
Average: 6790 409198 98.37 1448 28320 2417756
257.13 38154 46036 76
______________________________________________________________________________________________________
Linux 4.13.0-32-generic (servername) 03/01/2018 _x86_64_ (4 CPU)
09:31:02 AM kbmemfree kbmemused %memused kbbuffers kbcached kbcommit
%commit kbactive kbinact kbdirty
09:31:03 AM 1276908 1885452 59.62 32256 735348 2728356
74.01 798260 768032 260
09:31:04 AM 1276908 1885452 59.62 32264 735348 2728356
74.01 798304 768036 280
Average: 1276908 1885452 59.62 32260 735348 2728356
74.01 798282 768034 270
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.13.0-36-generic 4.13.0-36.40~16.04.1
ProcVersionSignature: Ubuntu 4.13.0-26.29~16.04.2-generic 4.13.13
Uname: Linux 4.13.0-26-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
Date: Thu Mar 1 10:17:06 2018
InstallationDate: Installed on 2016-08-25 (552 days ago)
InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release amd64
(20160420.3)
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: linux-hwe
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux-hwe (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug xenial
** Attachment added: "apport file collected from affected server"
https://bugs.launchpad.net/bugs/1752613/+attachment/5066143/+files/apport.linux-image-4.13.0-36-generic.faamidi7.apport
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https://bugs.launchpad.net/bugs/1752613
Title:
Kernel 4.13.0-36-generic has memory issues on Hyper-V hosts.
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