Thank you Paul for the bug report.
Just as an additional information, the 5.3.0 series kernels are not
supported anymore. If you want to continue using Ubuntu 18.04 with the
additional security and bug fixes you will need to eventually upgrade to
a 5.4.0-based AWS kernel.
Are you able to point at which commit exactly from v5.9-rc4 fixes the
memory leak you are experiencing? Most of the commits mentioning "leak"
in their titles has already been applied to the 5.4 kernels, so if you
can still reproduce the issue with the latest 5.4 AWS kernel we are
probably missing another fix.
Thank you.
** Also affects: linux-aws (Ubuntu Focal)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1925261
Title:
memory leak on AWS kernels when using docker
Status in linux-aws package in Ubuntu:
New
Status in linux-aws source package in Focal:
New
Bug description:
Ever since the "ubuntu-bionic-18.04-amd64-server-20200729" EC2 Ubuntu
AMI was released which has the "5.3.0-1032-aws" kernel we have been
hitting a 100% repro memory leak that causes our app that is running
under docker to be OOM killed.
The scenario is that we have an app running in a docker container and
it occasionally catches a crash happening within itself and when that
happens it creates another process which triggers a gdb dump of that
parent app. Normally this works fine but under these specific kernels
it causes the memory usage to grow and grow until it hits the maximum
allowed memory for the container at which point the container is
killed.
I have tested using several of the latest available Ubuntu AMIs
including the latest "ubuntu-bionic-18.04-amd64-server-20210415" which
has the "5.4.0-1045-aws" kernel and the bug still exists.
I also tested a bunch of the mainline kernels and found the fix was
introduced for this memory leak in the v5.9-rc4 kernel
(https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.9-rc4/CHANGES).
Do you all have any idea if or when that set of changes will be
backported into a supported kernel for Ubuntu 18.04 or 20.04?
Release we are running:
root@<redacted>:~# lsb_release -rd
Description: Ubuntu 18.04.5 LTS
Release: 18.04
Docker / containerd.io versions:
- containerd.io: 1.4.4-1
- docker-ce: 5:20.10.5~3-0~ubuntu-bionic
Latest supported kernel I tried which still sees the memory leak:
root@hostname:~# apt-cache policy linux-aws
linux-aws:
Installed: 5.4.0.1045.27
Candidate: 5.4.0.1045.27
Version table:
*** 5.4.0.1045.27 500
500 http://us-east-1.ec2.archive.ubuntu.com/ubuntu
bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64
Packages
100 /var/lib/dpkg/status
4.15.0.1007.7 500
500 http://us-east-1.ec2.archive.ubuntu.com/ubuntu bionic/main amd64
Packages
Thanks,
Paul
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