NFD

When on-demand UdpFace is being closed, the object itself is still alive.

To check:

• in udp-face.cpp on line 128 (just after close()):

  NFD_LOG_ERROR("Remaining references: " << this->shared_from_this().use_count() - 1);
  

• run NFD

• from another machine either send UDP packet with nc or establish udp face towards the machine

• wait

Expectation: Remaining references: 0 (or crash)

Actual: Remaining references: 2

This may not be just UdpFace, I just discovered it with idle UdpFace. Where could we forgotten this face?