Oknet Xu created TS-4879:
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Summary: NetVC leaks while hyper emergency occur on
check_emergency_throttle()
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
check_emergency_throttle().
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.
Thus:
- 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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