Public bug reported:

I upgraded to docker.io 20.10.2-0ubuntu1~20.04.2 in 20.04/focal
yesterday and restarted docker.service.

I'm running InfluxDB (image influxdb:1.8.4-alpine) that has port UDP
port 25826 exposed for receiving collectd traffic.

Since installing the new version, InfluxDB does not receive any data
anymore. No errors are visible in the docker or container log.

(TCP traffic to a Grafana container on the same host still works.)

Downgrading to the previous versions of the relevant packages restores UDP 
traffic:
apt remove docker.io containerd runc
apt install docker.io=19.03.8-0ubuntu1 containerd=1.3.3-0ubuntu2 
runc=1.0.0~rc10-0ubuntu1

** Affects: docker.io (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: focal regression

** Description changed:

- I upgraded to docker.io 20.10.2-0ubuntu1~20.04.2 yesterday and restarted
- docker.service.
+ I upgraded to docker.io 20.10.2-0ubuntu1~20.04.2 in 20.04/focal
+ yesterday and restarted docker.service.
  
  I'm running InfluxDB (image influxdb:1.8.4-alpine) that has port UDP
  port 25826 exposed for receiving collectd traffic.
  
  Since installing the new version, InfluxDB does not receive any data
  anymore. No errors are visible in the docker or container log.
  
  (TCP traffic to a Grafana container on the same host still works.)
  
  Downgrading to the previous versions of the relevant packages restores UDP 
traffic:
  apt remove docker.io containerd runc
  apt install docker.io=19.03.8-0ubuntu1 containerd=1.3.3-0ubuntu2 
runc=1.0.0~rc10-0ubuntu1

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https://bugs.launchpad.net/bugs/1925303

Title:
  UDP networking is broken in 20.10.2-0ubuntu1~20.04.2

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