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From: Richard Stallman <rms@gnu.org>
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Subject: Re: OS X: C-g does not break out of infinite loop
Date: Thu, 15 Jul 2004 09:17:36 -0400
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    with Yoichi's response (together with a test case that
    I can reproduce: C-g on OS X cannot recover from
    evaling any of the following three:

    1. (condition-case nil (while 1) (error (error "catch
    error")) (quit (error "catch quit")))
    2. (condition-case nil (while 1) (error (error "catch
    error")))
    3. (while 1)

It sounds like the mechanism for detecting C-g may need a redesign.
Is there any Lisp program you can successfully interrupt with C-g?