title: Docker prune stuck in "a prune operation is already running"
body: <p>I run command <code>docker system prune</code> yesterday, it took some time and then my SSH session was disconnected from different reason.</p>
  
  <p>Unfortunately I am getting now:</p>
  
  <p><code>Error response from daemon: a prune operation is already running</code>.</p>
  
  <p>Obviously there is a lock and prune command is not running anymore. </p>
  
  <p>Does anybody know how remove the lock without stopping and removing all containers?</p>
  
  <p>EDIT: Created an issue in repo: <a href="https://github.com/moby/moby/issues/36447" rel="noreferrer">https://github.com/moby/moby/issues/36447</a></p>