title: Debug info when run today extension
body: <p>Got this debug info when debug a today extension app</p>
  
  <p>"host connection &lt; NSXPCConnection: 0x170113560 > connection from pid 53 invalidated" </p>
  
  <p>does anyone know what this means? it shows almost every time when "widgetPerformUpdateWithCompletionHandler" called.</p>