Session timeout doesn't call destroy() from InvertedShell

When creating the ssh server I have this:

sshd.setShellFactory(new PseudoTerminalFactory("/system/bin/sh", "-i"));

The PseudoTerminalFactory has this:

@Override
public Command create()

{ return new InvertedShellWrapper(new PseudoTerminal()); }

And the "PseudoTerminal implements InvertedShell" contains the following
functions:

destroy()
exitValue()
getErrorStream()
getInputStream()
getOutputStream()
isAlive()
start(Map<String, String> env)

Now here is the thing, when a session is created and the user:

• closes it
• or the server is stopped
  The destroy and exitValue functions are being called. In the destroy
  function we stop the shell process (which is started in the start function).

However, if a user has a shell connection and doesn't do anything, default
after 10 minutes the idletimeout will have passed and the user gets a
timeout error and gets disconnected. HOWEVER, after that the destroy and
exitValue are never called, so the isAlive function will continue being
called (always returns true till the destroy function is called) and we
will have an endless running thread.
Next time we start the server we get an error the port is in use, etc. And
all the time the checking of isAlive of that session will just continue.