ssh client: xshell 5
When the binding fails in org.apache.sshd.common.io.nio2.Nio2Acceptor#bind, the file descriptor will be leaked.
When AsynchronousServerSocketChannel#bind bind a port that has already been listened to, the code will throw a BindException, but the code does not handle the exception, causing the socket to have no chance to be closed. Eventually results in a limit on the number of maximum file descriptors that exceed the system.
Compile Main.java and run it on a linux machine.
Use the client to connect to the server and the client to set up x11 forwarding. Using lsof on the machine where the server is located, you can see the file descriptors that have not been released.