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From: Richard Stallman <rms@gnu.org>
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Subject: Re: unexec problem
Date: Tue, 05 Feb 2008 03:04:25 -0500
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Xref: news.gmane.org gmane.emacs.devel:88254
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    > When I try to bootstrap, bootstrap-emacs crashes
    > in the first call to malloc.  Experience shows this is
    > usually due to a bug in the unexec mechanism.
    > However, unexelf.c is unchanged from Emacs 22.
    >
    > Since this sort of thing is a big pain to debug,
    > does anyone have any clues?

    Is this on the trunk?

Yes.  And it worked a week ago.
I think the unicode merge broke it.