Promtail 3.2.0 crash on docker with panic: runtime error: invalid memory address or nil pointer dereference

[lluisd]

Describe the bug On starting Promtail 3.2.0 I get this error, it was working fine with previous version.

panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x88 pc=0x2bf5735] goroutine 132 [running]: github.com/prometheus/prometheus/discovery/moby.(*DockerDiscovery).refresh(0xc000894440, {0x47b79d0, 0xc0007b3950}) /src/loki/vendor/github.com/prometheus/prometheus/discovery/moby/docker.go:284 +0xcd5 github.com/prometheus/prometheus/discovery/refresh.(*Discovery).refresh(0xc00065bf20, {0x47b79d0, 0xc0007b3950}) /src/loki/vendor/github.com/prometheus/prometheus/discovery/refresh/refresh.go:112 +0xcf github.com/prometheus/prometheus/discovery/refresh.(*Discovery).Run(0xc00065bf20, {0x47b79d0, 0xc0007b3950}, 0xc000312900) /src/loki/vendor/github.com/prometheus/prometheus/discovery/refresh/refresh.go:68 +0x66 created by github.com/prometheus/prometheus/discovery.(*Manager).startProvider in goroutine 1 /src/loki/vendor/github.com/prometheus/prometheus/discovery/manager.go:302 +0x2ec

I use that docker-compose for Promtail

`version: "3.9"

services: promtail: image: grafana/promtail:3.2.0 container_name: promtail command:

• '--config.file=/etc/promtail/promtail-config.yaml' volumes:
• /volume1/docker/grafana/promtail-config.yaml:/etc/promtail/promtail-config.yaml
• /var/run/docker.sock:/var/run/docker.sock:ro networks:
• loki_net ports:
• 9030:9030

networks: loki_net: name: loki_net external: true`

and that promtail configuration: `server: http_listen_address: 0.0.0.0 http_listen_port: 9030 enable_runtime_reload: true

positions: filename: /tmp/positions.yaml

clients:

• url: http://loki:3100/loki/api/v1/push

• job_name: container_logs docker_sd_configs:

  • host: unix:///var/run/docker.sock refresh_interval: 1m relabel_configs:
  • source_labels: ['__meta_docker_container_name'] regex: '/(.*)' target_label: 'container'
  • target_label: 'instance' replacement: 'ds920'

• job_name: container_logs_nuc docker_sd_configs:

  • host: tcp://192.168.0.161:2375 refresh_interval: 1m host_networking_host: 192.168.0.161 relabel_configs:
  • source_labels: ['__meta_docker_container_name'] regex: '/(.*)' target_label: 'container'
  • target_label: 'instance' replacement: 'nuc'

• job_name: container_logs_minipc docker_sd_configs:

  • host: tcp://192.168.0.162:2375 refresh_interval: 1m host_networking_host: 192.168.0.162 relabel_configs:
  • source_labels: ['__meta_docker_container_name'] regex: '/(.*)' target_label: 'container'
  • target_label: 'instance' replacement: 'minipc' `

Environment:

• Promtail & loki dockers with 3.2.0 version

[efficks]

I got the same problem and for now, rolled back to 3.1.1 to fix the issue.