Could someone throw light on this what could be the issue in this trigger? JFYI it gives below error 
Apex trigger t2 caused an unexpected exception, contact your administrator: t2: execution of AfterInsert caused by: System.DmlException: Insert failed. First exception on row 0; first error: CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY, t2: maximum trigger depth exceeded Case trigger even

trigger t2 on Case (after insert)
{
  List<case> chcase = new List<case>();
  for (Case c: trigger.New)
  {
    Case child = new Case(ParentId = c.Id, subject = c.Subject);
    chcase.add(child);
  }
  insert chcase;  
}