A large number of wait_close connections are not closed on the server

[DarkMatterV]

A large number of wait_close connections on the server are not closed，but some clients(in prod env, I'm not sure if it's all or part) have released connections. And the new client cannot connect to the server.

In local test，when i kill client processes or ctrl+c shutdown client，the connection between the server and client is released.

I guess that it may be related to resource exhaustion, the server does not have enough resources to release the connection, because this phenomenon occurs with OOM.