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From: Richard Stallman <rms@gnu.org>
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Subject: Re: emacs 21.1, linux 2.4.12-3.5G, core dump in set_point_both()
Date: Fri, 31 May 2002 15:28:37 -0600 (MDT)
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Thanks for the bug report.

I suspect that ZV and ZV_BYTE got out of sync, that they do not
correspond to each other properly given the current buffer contents.
Or perhaps some other pair of pointers that are supposed to match up
as character count and byte count.  If this is true, it would be due
to a bug in some C primitives.

The way to find out more would be to carefully study the data structures
using GDB.  It is not easy, but it is the only way.