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Bug: Panic when using DNS_KEEP_NAMESERVER #2840

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#2988
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Bug: Panic when using DNS_KEEP_NAMESERVER#2840
#2988
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Category: DNS 📠Priority: 🚨 Urgent
@PythonCoderAS

Description

@PythonCoderAS
PythonCoderAS
opened on Jul 3, 2025

Is this urgent?

No

Host OS

Ubuntu Noble

CPU arch

x86_64

VPN service provider

ProtonVPN

What are you using to run the container

docker-compose

What is the version of Gluetun

Running version latest built on 2025-01-22T08:30:14.628Z (commit 13532c8)

What's the problem 🤔

Shutting down the container causes a Go panic:

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x88 pc=0x9fd6e8]

goroutine 79 [running]:
github.com/qdm12/dns/v2/pkg/server.(*Server).Stop(0x0)
	github.com/qdm12/dns/[email protected]/pkg/server/server.go:149 +0x48
github.com/qdm12/gluetun/internal/dns.(*Loop).stopServer(0xc000426870)
	github.com/qdm12/gluetun/internal/dns/run.go:102 +0x1f
github.com/qdm12/gluetun/internal/dns.(*Loop).runWait(0xc000426870, {0x1482778, 0xc0002679a0}, 0x0)
	github.com/qdm12/gluetun/internal/dns/run.go:77 +0x157
github.com/qdm12/gluetun/internal/dns.(*Loop).Run(0xc000426870, {0x1482778, 0xc0002679a0}, 0x0?)
	github.com/qdm12/gluetun/internal/dns/run.go:66 +0x3c7
created by main._main in goroutine 22
	./main.go:399 +0x274b

Share your logs (at least 10 lines)

=========== Made with ❤️ by ============
======= https://github.com/qdm12 =======
========================================
========================================

Running version latest built on 2025-01-22T08:30:14.628Z (commit 13532c8)

🔧 Need help? ☕ Discussion? https://github.com/qdm12/gluetun/discussions/new/choose
🐛 Bug? ✨ New feature? https://github.com/qdm12/gluetun/issues/new/choose
💻 Email? [email protected]
💰 Help me? https://www.paypal.me/qmcgaw https://github.com/sponsors/qdm12
2025-07-03T14:15:44-04:00 INFO [routing] default route found: interface eth0, gateway 10.1.0.1, assigned IP 10.1.0.32 and family v4
2025-07-03T14:15:44-04:00 INFO [routing] default route found: interface eth0, gateway fd89:8827:8499::1, assigned IP fd89:8827:8499::20 and family v6
2025-07-03T14:15:44-04:00 INFO [routing] local ethernet link found: eth0
2025-07-03T14:15:44-04:00 INFO [routing] local ipnet found: 10.1.0.0/16
2025-07-03T14:15:44-04:00 INFO [routing] local ipnet found: fd89:8827:8499::/64
2025-07-03T14:15:44-04:00 INFO [routing] local ipnet found: fe80::/64
2025-07-03T14:15:44-04:00 INFO [firewall] enabling...
2025-07-03T14:15:44-04:00 INFO [firewall] enabled successfully
2025-07-03T14:15:45-04:00 INFO [storage] merging by most recent 20776 hardcoded servers and 20776 servers read from /gluetun/servers.json
2025-07-03T14:15:45-04:00 INFO Alpine version: 3.20.5
2025-07-03T14:15:45-04:00 INFO OpenVPN 2.5 version: 2.5.10
2025-07-03T14:15:45-04:00 INFO OpenVPN 2.6 version: 2.6.11
2025-07-03T14:15:45-04:00 INFO IPtables version: v1.8.10
2025-07-03T14:15:45-04:00 INFO Settings summary:
├── VPN settings:
|   ├── VPN provider settings:
|   |   ├── Name: protonvpn
|   |   ├── Server selection settings:
|   |   |   ├── VPN type: wireguard
|   |   |   ├── Countries: united states
|   |   |   ├── Cities: new york
|   |   |   ├── Port forwarding only servers: yes
|   |   |   └── Wireguard selection settings:
|   |   └── Automatic port forwarding settings:
|   |       ├── Redirection listening port: disabled
|   |       ├── Use port forwarding code for current provider
|   |       ├── Forwarded port file path: /tmp/gluetun/forwarded_port
|   |       └── Forwarded port up command: /bin/sh -c 'wget -O- --retry-connrefused --post-data "json={\"listen_port\":{{PORTS}}}" http://127.0.0.1:8080/api/v2/app/setPreferences 2>&1'
|   └── Wireguard settings:
|       ├── Private key: qCj...kA=
|       ├── Interface addresses:
|       |   └── 10.2.0.2/32
|       ├── Allowed IPs:
|       |   ├── 0.0.0.0/0
|       |   └── ::/0
|       └── Network interface: tun0
|           └── MTU: 1320
├── DNS settings:
|   └── Keep existing nameserver(s): yes
├── Firewall settings:
|   └── Enabled: yes
├── Log settings:
|   └── Log level: info
├── Health settings:
|   ├── Server listening address: 127.0.0.1:9999
|   ├── Target address: cloudflare.com:443
|   ├── Duration to wait after success: 5s
|   ├── Read header timeout: 100ms
|   ├── Read timeout: 500ms
|   └── VPN wait durations:
|       ├── Initial duration: 6s
|       └── Additional duration: 5s
├── Shadowsocks server settings:
|   └── Enabled: no
├── HTTP proxy settings:
|   └── Enabled: no
├── Control server settings:
|   ├── Listening address: :8000
|   ├── Logging: yes
|   └── Authentication file path: /gluetun/auth/config.toml
├── Storage settings:
|   └── Filepath: /gluetun/servers.json
├── OS Alpine settings:
|   ├── Process UID: 1000
|   ├── Process GID: 1000
|   └── Timezone: america/new_york
├── Public IP settings:
|   ├── IP file path: /tmp/gluetun/ip
|   ├── Public IP data base API: ipinfo
|   └── Public IP data backup APIs:
|       ├── ifconfigco
|       ├── ip2location
|       └── cloudflare
└── Version settings:
    └── Enabled: yes
2025-07-03T14:15:45-04:00 INFO [routing] default route found: interface eth0, gateway 10.1.0.1, assigned IP 10.1.0.32 and family v4
2025-07-03T14:15:45-04:00 INFO [routing] default route found: interface eth0, gateway fd89:8827:8499::1, assigned IP fd89:8827:8499::20 and family v6
2025-07-03T14:15:45-04:00 INFO [routing] adding route for 0.0.0.0/0
2025-07-03T14:15:45-04:00 INFO [routing] adding route for ::/0
2025-07-03T14:15:45-04:00 INFO [firewall] setting allowed subnets...
2025-07-03T14:15:45-04:00 INFO [routing] default route found: interface eth0, gateway 10.1.0.1, assigned IP 10.1.0.32 and family v4
2025-07-03T14:15:45-04:00 INFO [routing] default route found: interface eth0, gateway fd89:8827:8499::1, assigned IP fd89:8827:8499::20 and family v6
2025-07-03T14:15:45-04:00 WARN [dns] ⚠️⚠️⚠️  keeping the default container nameservers, this will likely leak DNS traffic outside the VPN and go through your container network DNS outside the VPN tunnel!
2025-07-03T14:15:45-04:00 INFO [http server] http server listening on [::]:8000
2025-07-03T14:15:45-04:00 INFO [healthcheck] listening on 127.0.0.1:9999
2025-07-03T14:15:45-04:00 INFO [firewall] allowing VPN connection...
2025-07-03T14:15:45-04:00 INFO [wireguard] Using available kernelspace implementation
2025-07-03T14:15:45-04:00 INFO [wireguard] Connecting to 217.138.198.246:51820
2025-07-03T14:15:45-04:00 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.
2025-07-03T14:15:50-04:00 INFO [healthcheck] healthy!

2025-07-03T14:16:14-04:00 WARN Caught OS signal terminated, shutting down
2025-07-03T14:16:14-04:00 INFO dns ticker: terminated ✔️
2025-07-03T14:16:14-04:00 INFO updater ticker: terminated ✔️
2025-07-03T14:16:14-04:00 INFO http server: terminated ✔️
2025-07-03T14:16:14-04:00 INFO control: terminated ✔️
2025-07-03T14:16:14-04:00 INFO updater: terminated ✔️
2025-07-03T14:16:14-04:00 INFO tickers: terminated ✔️
2025-07-03T14:16:14-04:00 INFO HTTP health server: terminated ✔️
2025-07-03T14:16:14-04:00 ERROR [vpn] getting public IP address information: context canceled
2025-07-03T14:16:14-04:00 ERROR [vpn] cannot get version information: Get "https://api.github.com/repos/qdm12/gluetun/commits": context canceled
2025-07-03T14:16:14-04:00 ERROR [vpn] context canceled
2025-07-03T14:16:14-04:00 INFO vpn: terminated ✔️
2025-07-03T14:16:14-04:00 INFO shadowsocks proxy: terminated ✔️
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x88 pc=0x9fd6e8]

goroutine 79 [running]:
github.com/qdm12/dns/v2/pkg/server.(*Server).Stop(0x0)
	github.com/qdm12/dns/[email protected]/pkg/server/server.go:149 +0x48
github.com/qdm12/gluetun/internal/dns.(*Loop).stopServer(0xc000426870)
	github.com/qdm12/gluetun/internal/dns/run.go:102 +0x1f
github.com/qdm12/gluetun/internal/dns.(*Loop).runWait(0xc000426870, {0x1482778, 0xc0002679a0}, 0x0)
	github.com/qdm12/gluetun/internal/dns/run.go:77 +0x157
github.com/qdm12/gluetun/internal/dns.(*Loop).Run(0xc000426870, {0x1482778, 0xc0002679a0}, 0x0?)
	github.com/qdm12/gluetun/internal/dns/run.go:66 +0x3c7
created by main._main in goroutine 22
	./main.go:399 +0x274b

Share your configuration

gluetun:
    image: qmcgaw/gluetun
    container_name: gluetun
    restart: unless-stopped
    cap_add:
      - NET_ADMIN
    devices:
      - /dev/net/tun:/dev/net/tun
    environment:
      - VPN_SERVICE_PROVIDER=protonvpn
      - VPN_TYPE=wireguard
      - SERVER_COUNTRIES="United States"
      - SERVER_CITIES="New York"
      - DNS_KEEP_NAMESERVER=on
      - PORT_FORWARD_ONLY=true
      - TZ=America/New_York
      - VPN_PORT_FORWARDING=on
      - VPN_PORT_FORWARDING_UP_COMMAND=/bin/sh -c 'wget -O- --retry-connrefused --post-data "json={\"listen_port\":{{PORTS}}}" http://127.0.0.1:8080/api/v2/app/setPreferences 2>&1'

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