[Users] OOM Killer invoked even that are available RAM and swap on the machine

[Danny Gurman]

Hello again,

Sorry but I forgot to specify in the previous mail that machine deployed as VMWare VA
The vmware-toolbox-cmd stat balloon return always 0.

Regards,
Danny

From: Danny Gurman
Sent: Friday, September 29, 2017 2:18 AM
To: 'users at openvz.org' <users at openvz.org>
Cc: Rotem Inbar <RotemI at Radware.com>; Dima Paikin <DimaP at Radware.com>; Yohai Liebman <YohaiL at Radware.com>; Lior Komanski <LiorK at Radware.com>; Liat Vaknin <LiatV at Radware.com>
Subject: RE: OOM Killer invoked even that are available RAM and swap on the machine


Hello all,
I will really appreciate assistance regarding the following issue:

We have a product deployed on CentosOS 6.9 with OpenVZ.
Machine RAM size - 32 GB + Swap file (16 GB).
The following described issue was reproduced on the OpenVZ kernels:
2.6.32-042stab125.1 , 2.6.32-042stab123.9 , 2.6.32-042stab123.2, 2.6.32-042stab120.11

For debugging  purpose the single container on the host was stopped.

We observed that OOM Killer is invoked whenever host RAM usage without buffers reach ~13 GB:
Free command output (few seconds before OOM killer invoked):
total       used       free     shared    buffers     cached
Mem:      32793080   23197272    9595808        920     135992   10276712
    -/+ buffers/cache:   12784568   20008512
Swap:     16465916          0   16465916

On the message buffer, we see that the machine memory state just before the OOM killer invocation is:
RAM: 2097074 / 2097152 [1] SWAP: 1048576 / 1048576 [1] KMEM: 227942400 /

Again , machine has 32 GB, only 13 GB is used, no swap usage - so where those wrong values came
from and why OOM killer is invoked in this stage?

The issue is reproducible with similar results every time.

Is it a known issue ?
Should I open a defect for this?
Also - is there a  way to totally disable the OOM killer?

I'll be glad to provide any required detail (like sysctl -a output)

Regards,
Danny

[Radware]

Danny Gurman
Dev Lead, APSolute Vision
Email: danny.gurman at gmail.com<mailto:danny.gurman at gmail.com>

T:+972 723917088
M:+972 526111008
F:


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