title: starting container process caused "process_linux.go:303: getting the final child's pid from pipe caused \"EOF\"": unknown
body: <p>Today when I start kubernetes(v1.15) pod, show this error:</p>
  <pre><code>Failed create pod sandbox: rpc error: code = Unknown desc = failed to start sandbox container for pod &quot;soa-user-service-7bf6d9886b-vd422&quot;: Error response from daemon: OCI runtime create failed: container_linux.go:345: starting container process caused &quot;process_linux.go:303: getting the final child's pid from pipe caused \&quot;EOF\&quot;&quot;: unknown
  </code></pre>
  <p>I tried execute this command in host(<code>CentOS Linux release 7.6.1810 (Core)</code>):</p>
  <pre><code>[root@uat-k8s-02 ~]# sysctl -w user.max_user_namespaces=15000
  user.max_user_namespaces = 15000
  </code></pre>
  <p>but the problem still exists. what should I do to fix it?</p>