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From: Chong Yidong <cyd@stupidchicken.com>
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Subject: Re: [alex@emacswiki.org: edebug can hang Emacs]
Date: Fri, 29 Sep 2006 14:31:55 -0400
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Richard Stallman <rms@gnu.org> writes:

> In emacs -q, edebug the following defun using C-u M-C-x:
>
> (defun test ()
>   (let ((l (make-list 100000 1)))
>     (dolist (i l)
>       (1+ i))))
>
> Now call it:
>
> (test)
>
> When you get to the dolist, Emacs hangs.

It is merely thinking.  Wait long enough, and it comes back to life
(I've checked this).