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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Display bug [Re: My Emacs unicode 2 crash again ...]
Date: Thu, 08 Mar 2007 16:47:12 -0500
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To: Hongyi Zhao <hongyi.zhao@gmail.com>
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    > Strange.  What about if you use -O0 but do not use --enable-asserts?

    In this way, emacs won't crash.

That seems to be a bug due to optimization.

The way to start to track this down is to try compiling various
source files with optimization and without optimization.  In most cases
you will see that a particular source file is the cause.