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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: sit-for
Date: Sat, 29 Jul 2006 19:34:17 -0400
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References: <854px1e8xx.fsf@lola.goethe.zz> <87d5bppfid.fsf@stupidchicken.com>
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    Update: it still happens.  I am working for a while in a web browser,
    suddenly the fans engage, the Emacs frame (not even mapped when this
    happens) shows a very slow and erratically blinking cursor, and `top'
    shows that Emacs is consuming close to 100% of CPU power.

Please run Emacs under GDB, so you can suspend it several times while
this is happening.  Make a backtrace (C and Lisp) each time, and by
and by you'll see a pattern which shows what part of Emacs is doing
this.