Bug: Crazy high IO while server is connected

[normanu]

Is this urgent?

Yes

Host OS

Alpine 3.23

CPU arch

x86_64

VPN service provider

AirVPN

What are you using to run the container

docker-compose

What is the version of Gluetun

c25c9f6

What's the problem 🤔

The VPN is connecting fine and I can connect every container through it.
But I get a crazy high IO, its reading with up to 190MB/s
It used to work before I updated to the latest versions.

Share your logs (at least 10 lines)

vpn  | 2025-12-09T17:02:47+01:00 INFO [routing] default route found: interface eth0, gateway 172.18.0.1, assigned IP 172.18.0.2 and family v4
vpn  | 2025-12-09T17:02:47+01:00 INFO [routing] adding route for 0.0.0.0/0
vpn  | 2025-12-09T17:02:47+01:00 INFO [firewall] setting allowed subnets...
vpn  | 2025-12-09T17:02:47+01:00 INFO [routing] default route found: interface eth0, gateway 172.18.0.1, assigned IP 172.18.0.2 and family v4
vpn  | 2025-12-09T17:02:47+01:00 INFO [dns] using plaintext DNS at address 1.1.1.1
vpn  | 2025-12-09T17:02:47+01:00 INFO [healthcheck] listening on 127.0.0.1:9999
vpn  | 2025-12-09T17:02:47+01:00 INFO [http proxy] listening on :8888
vpn  | 2025-12-09T17:02:47+01:00 INFO [shadowsocks] listening UDP on [::]:8388
vpn  | 2025-12-09T17:02:47+01:00 INFO [shadowsocks] listening TCP on [::]:8388
vpn  | 2025-12-09T17:02:47+01:00 INFO [http server] http server listening on [::]:8000
vpn  | 2025-12-09T17:02:47+01:00 INFO [firewall] allowing VPN connection...
vpn  | 2025-12-09T17:02:47+01:00 INFO [wireguard] Using available kernelspace implementation
vpn  | 2025-12-09T17:02:47+01:00 INFO [wireguard] Connecting to 213.152.x.x:1637
vpn  | 2025-12-09T17:02:47+01:00 INFO [wireguard] Wireguard setup is complete. Note Wireguard is a silent protocol and it may or may not work, without giving any error message. Typically i/o timeout errors indicate the Wireguard connection is not working.
vpn  | 2025-12-09T17:02:47+01:00 INFO [dns] downloading hostnames and IP block lists
vpn  | 2025-12-09T17:02:49+01:00 INFO [dns] DNS server listening on [::]:53
vpn  | 2025-12-09T17:02:49+01:00 INFO [dns] ready
vpn  | 2025-12-09T17:02:49+01:00 INFO [ip getter] Public IP address is 213.152.x.x (Netherlands, Utrecht, Nieuwegein - source: ipinfo)
vpn  | 2025-12-09T17:02:50+01:00 INFO [vpn] You are running 3 commits behind the most recent latest

Share your configuration

vpn:
      restart: always
      image: qmcgaw/gluetun
      container_name: vpn
      cap_add:
        - NET_ADMIN
      ports:
        - 8888:8888/tcp # HTTP proxy
        - 8388:8388/tcp # Shadowsocks
        - 8388:8388/udp # Shadowsocks
      environment:
        - VPN_SERVICE_PROVIDER=airvpn
        - VPN_TYPE=wireguard
        - WIREGUARD_PRIVATE_KEY=
        - WIREGUARD_PRESHARED_KEY=
        - WIREGUARD_ADDRESSES=
        - SERVER_COUNTRIES=Netherlands
        - TZ=Europe/Amsterdam
        - HTTPPROXY=on
        - SHADOWSOCKS=on
        - SHADOWSOCKS_PASSWORD=empty
      devices:
        - /dev/net/tun:/dev/net/tun

[github-actions]

@qdm12 is more or less the only maintainer of this project and works on it in his free time.
Please:

• do not ask for updates, be patient
• 👍 the issue to show your support instead of commenting
  @qdm12 usually checks issues at least once a week, if this is a new urgent bug,
  revert to an older tagged container image