kubelet memory leak v1.18.1

[danisafta]

What happened:

kubelet increased more than 100MB in memory in 4 days.

What you expected to happen:

kubelet to not used that amount of RAM

How to reproduce it (as minimally and precisely as possible):

I have reproduced it using 3 cronjobs which create hello world pods each minute
and another cronjob that writes a line to a file each minute.

Anything else we need to know?:

Environment:

• Kubernetes version (use kubectl version):
  v1.18.1

• Cloud provider or hardware configuration
  happens on both virtualbox and baremetal

• OS (e.g: cat /etc/os-release):
  centos 7

• Kernel (e.g. uname -a):
  4.18.0-147.3.1

I have seen some existing issues like #64137 but I do not have any dangling resources associated with the cgroup.

[k8s-ci-robot]

@danisafta: This issue is currently awaiting triage.

If a SIG or subproject determines this is a relevant issue, they will accept it by applying the triage/accepted label and provide further guidance.

The triage/accepted label can be added by org members by writing /triage accepted in a comment.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[pacoxu]

/sig node

[wzshiming]

/assign

This is a duplicate issue, there has been a fixed PR but it has not been merged. #100326