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From: Eli Zaretskii <eliz@is.elta.co.il>
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Subject: Re: unpredictable emacs 21 crashes
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On Sat, 15 Jun 2002, Richard Stallman wrote:

> Most likely, whatever called GC won't be relevant.
> The crash is probably due to invalid data.  To analyze it
> you need to study the data being worked on in the innermost frames.
> By working back one frame at a time, you can see what data structure
> the invalid objects are found in.  The vector last_marked (see
> alloc.c) can help you trace this back.

There's some information about debugging these problems in etc/DEBUG.