Zombie process

[Ben]

Describe the bug
The container has a zombie process.

To Reproduce using docker-compose

version: '2.4'

networks:
  nordvpn:
    external:
      name: nordvpn

services:
  nordvpn:
    image: ghcr.io/bubuntux/nordvpn
    container_name: nordvpn
    cap_add:
      - NET_ADMIN
    restart: unless-stopped
    environment:
      - USER=USER
      - PASS=PASS
      - DNS=103.86.96.100,103.86.99.100
      - TECHNOLOGY=NordLynx
        #- TECHNOLOGY=OpenVPN
        #- PROTOCOL=UDP
      - CONNECT=United_States
      - NET_LOCAL=192.168.1.0/24
    ports:
      - "8118:8118"     # qBittorrent Web UI
      - "6881:6881"     # qBittorrent
      - "6881:6881/udp" # qBittorrent UDP
    networks:
      - nordvpn
    sysctls:
      - net.ipv6.conf.all.disable_ipv6=1
    mem_limit: 200m
    mem_reservation: 100m

Expected behavior
There should be no zombie processes.

Logs
System Login:

Welcome to Ubuntu 20.04.3 LTS (GNU/Linux 5.4.0-96-generic x86_64)

[...]

  System information as of Wed 19 Jan 2022 11:20:11 AM CST

  System load:                      0.25
  Usage of /:                       27.9% of 116.12GB
  Memory usage:                     61%
  Swap usage:                       0%
  Temperature:                      41.0 C
  Processes:                        533
  Users logged in:                  0

[...]

  => There is 1 zombie process.

[...]

0 updates can be applied immediately.

No mail.
Last login: Wed Jan 19 11:16:17 2022 from 192.168.1.203

Container Processes:

root@36a11f8ba987:/# ps aux
USER         PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root           1  0.0  0.0    196     4 ?        Ss   04:24   0:00 s6-svscan -t0 /var/run/s6/services
root          34  0.0  0.0    180     8 ?        S    04:24   0:00 foreground  if   /etc/s6/init/init-stage2-redirfd   f
root          35  0.0  0.0    196     4 ?        S    04:24   0:00 s6-supervise s6-fdholderd
root          44  0.0  0.0    176     4 ?        S    04:24   0:00 foreground  s6-setsid  -gq  --  with-contenv  backtic
root         477  0.0  0.0    196     4 ?        S    04:24   0:00 s6-supervise nordvpn
root         480  0.0  0.0   3976  2940 ?        Ss   04:24   0:00 /bin/bash ./run
root         487  0.3  0.2 6885148 71500 ?       Sl   04:24   2:56 /usr/sbin/nordvpnd
root         490  0.0  0.0      0     0 ?        Z    04:24   0:00 [s6-notifyonchec] <defunct>   <======= ZOMBIE PROCESS
root         558  0.0  0.0   2608   592 ?        S    04:24   0:00 /bin/sh -c nord_login && nord_config && nord_connect
root         801  0.0  0.0   3976  3192 ?        S    04:24   0:00 /bin/bash /usr/bin/nord_watch
root       92518  0.0  0.0   2508   584 ?        S    17:09   0:00 sleep 300
root       92943  1.0  0.0   4240  3324 pts/0    Ss   17:13   0:00 /bin/bash
root       92956  0.0  0.0   5896  2876 pts/0    R+   17:13   0:00 ps aux

Additional context
Ubuntu 20.04.3 LTS
docker --version = Docker version 20.10.12, build e91ed57
docker-compose --version = docker-compose version 1.29.2, build 5becea4c
uname -a = Linux systemname 5.4.0-96-generic #109-Ubuntu SMP Wed Jan 12 16:49:16 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

[github-actions]

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