Hi Pascal,
What operating system are you using?
This works for me on Debian testing with CLISP 2.33 using exactly the same inferior-lisp-program string.
Can you also describe the state where it gets stuck in more detail:
Is Emacs responsive?
If so, can you do things in the *inferior-lisp* buffer? Can you C-c C-c it and get a backtrace?
Is there a /tmp/slime.<emacs-pid> file?
-Luke