Echo under cmucl was hanging; the web server wasn't responding and the listener was mostly dead. Ctrl-c
MCL has some "dcmds;" that allow you to get some information from the running lisp image once you've broken into the lowlevel Mac debugger macsbug. The plbt command displays a stack backtrace that includes both Lisp functions and foreign functions:
Posted by jjwiseman at January 21, 2002 11:59 PM