linux-kernel - Still OOM problems with 4.9er kernels

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Message-ID: <aa4a3217-f94c-0477-b573-796c84255d1e@wiesinger.com>
Date:   Wed, 30 Nov 2016 08:10:15 +0100
From:   Gerhard Wiesinger <lists@...singer.com>
To:     linux-kernel@...r.kernel.org
Cc:     "Linus Torvalds torvalds"@linux-foundation.org
Subject: Still OOM problems with 4.9er kernels

Hello,

I'm having out of memory situations with my "low memory" VMs in KVM 
under Fedora (Kernel 4.7, 4.8 and also before). They started to get more 
and more sensitive to OOM. I recently found the following info:

https://marius.bloggt-in-braunschweig.de/2016/11/17/linuxkernel-4-74-8-und-der-oom-killer/
https://www.spinics.net/lists/linux-mm/msg113661.html

Therefore I tried the latest Fedora kernels: 4.9.0-0.rc6.git2.1.fc26.x86_64

But OOM situation is still very easy to reproduce:

1.) VM with 128-384MB under Fedora 25

2.) Having some processes run without any load (e.g. Apache)

3.) run an update with: dnf clean all; dnf update

4.) dnf python process get's killed

Please make the VM system working again in Kernel 4.9 and to use swap 
again correctly.

Thnx.

Ciao,

Gerhard