Oknet Xu created TS-4879:

             Summary: NetVC leaks while hyper emergency occur on 
                 Key: TS-4879
                 URL: https://issues.apache.org/jira/browse/TS-4879
             Project: Traffic Server
          Issue Type: Bug
          Components: Core
            Reporter: Oknet Xu

The con could be closed if hyper emergency occur on check_emergency_throttle().

But we did not check the con.fd while we get return from 

For hyper emergency:

- The socket fd is removed from epoll while it is closed.
- A NetVC with a closed socket fd is created and callback NET_EVENT_OPEN to SM.


- The NetVC will never triggered by NetHandler.
- Only InactivityCop could handle the NetVC and the default timeout value is 
86400 secs.

For the counter: net_connections_currently_open_stat

- It is increased in “connect_re_internal()”
- It isn't decreased while the con.fd set to NO_FD due to hyper emergency 
- Because it is decreased in close_UnixNetVConnection() only con.fd != NO_FD.

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