title: Can't cleanup a zombie process whose parent is init
body: <p>I have a zombie process:</p>
  
  <pre><code>$ ps aux | grep Zl
  root      6641  122  0.0  0 0 ? Zl   08:57 371:10 [ovs_dpdk] &lt;defunct&gt;
  </code></pre>
  
  <p>And, its parent looks like <code>init</code></p>
  
  <pre><code>$ pstree
  init─┬─acpid
       ├─atd
       ├─cron
       ├─dbus-daemon
       ├─dnsmasq
       ├─6*[getty]
       ├─irqbalance
       ├─libvirtd───10*[{libvirtd}]
       ├─ovs_dpdk───{ovs_dpdk}               &lt;==== here
       ├─rpc.idmapd
  </code></pre>
  
  <p>But, kill -9 does not kill him...</p>
  
  <pre><code>sudo kill -9 6641
  </code></pre>
  
  <p>I'm stumped here, any help?</p>