I discovered a way to crash Slime by compiling a simple sexp containing a string. Here are the conditions:

1. Connect to a running SBCL via swank (M-x slime-connect).

2. Cut and paste the sexp below containing the smiley-face into a lisp file.

3. Compile the fragment. 

That's it. When I do this the inferior Lisp process is terminated "by remote peer". 

(let ((dangerous-string "This is a smiley-face: ☺"))

  (print "Important safety tip: don't do this."))

I normally only work with UTF-8 characters, and my ignorance of handling other character sets is probably the culprit here. 

What should I do if I want to enable slime to work with strings like this?

Regards,

Jeff Cunningham