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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: flymake mode freezes emacs
Date: Tue, 07 Aug 2007 16:11:48 -0400
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You can debug the Lisp level with GDB.  We need to know the regexp.
You can find it by examining the first arg of the search or match
function using pr.

    #3  0x00000000004f685d in string_match_1 (regexp=19448755, 
    string=22042099, start=<value optimized out>,
	 posix=0) at search.c:457
    #4  0x000000000051d004 in Ffuncall (nargs=<value optimized out>, 
    args=<value optimized out>) at eval.c:3036

Type

   f 4
   p args[1]
   pr

We also need to know where it is looping.  You can find that
by following the instructions in etc/DEBUG about looping.