We (Automated Trading Desk) have seen a pure virtual called when an ORB IIOP connection closes before the connection completes.

I believe the problem lies in TAO_Transport::~TAO_Transport() in this code, particularly the call to purge_entry:

  if (!this->is_connected_)
    {
      // When we have a not connected transport we could have buffered
      // messages on this transport which we have to cleanup now.
      this->cleanup_queue_i();

      // Cleanup our cache entry
      this->purge_entry();
    }

TAO_Transport::purge_entry() calls Transport_Cache_Manager::purge_entry() which unbinds the cached item which is kept in a Cache_IntId.

~Cache_IntId() calls remove_reference on the transport. But, recall that the transport, TAO_IIOP_Transport in this case, has already been partially destructed and is now a TAO_Transport.

TAO_Transport::remove_reference() implements this code:
  return this->event_handler_i ()->remove_reference ();

and TAO_Transport::event_handler_i() is a pure virtual function.



I do not have a reproducible example but we have seen this in production more than once.