title: failed to start daemon: Error initializing network controller: Error creating default "bridge" network
body: <p>I'm using <code>Fedora release 33 (Thirty Three)</code>
  Docker version is <code>Docker version 20.10.0, build 7287ab3</code></p>
  <p>First I ran <code>docker system prune</code> and since then docker daemon failed to start.</p>
  <p>I ran <code>systemctl start docker</code> command and got</p>
  <pre><code>Job for docker.service failed because the control process exited with error code.
  See &quot;systemctl status docker.service&quot; and &quot;journalctl -xe&quot; for details.
  </code></pre>
  <p>and then <code>systemctl status docker.service</code> I got</p>
  <pre><code>● docker.service - Docker Application Container Engine
       Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor pr&gt;
       Active: failed (Result: exit-code) since Wed 2020-12-09 11:10:58 IST; 15s &gt;
  TriggeredBy: ● docker.socket
         Docs: https://docs.docker.com
      Process: 10391 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/contai&gt;
     Main PID: 10391 (code=exited, status=1/FAILURE)
  
  Dec 09 11:10:58 barad-laptop systemd[1]: docker.service: Scheduled restart job,&gt;
  Dec 09 11:10:58 barad-laptop systemd[1]: Stopped Docker Application Container E&gt;
  Dec 09 11:10:58 barad-laptop systemd[1]: docker.service: Start request repeated&gt;
  Dec 09 11:10:58 barad-laptop systemd[1]: docker.service: Failed with result 'ex&gt;
  Dec 09 11:10:58 barad-laptop systemd[1]: Failed to start Docker Application Con&gt;
  </code></pre>
  <p>Then <code>sudo dockerd --debug</code> and got</p>
  <pre><code>failed to start daemon: Error initializing network controller: Error creating default &quot;bridge&quot; network: Failed to program NAT chain: ZONE_CONFLICT: 'docker0' already bound to a zone
  </code></pre>
  <p>Related to <a href="https://github.com/moby/moby/issues/41609" rel="noreferrer">this Github issue</a></p>