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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: [jaa@cc.jyu.fi: BUG REPORT: Emacs is aborting sporadically by
 itself]
Date: Sat, 22 Mar 2003 21:54:19 -0500
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    This and the other stack trace he sent shows a crash inside 
    x_get_local_selection.  That function, and x_handle_selection_request where it 
    is called from, has local Lisp_object:s but no GCPRO.  Isn't that needed?

x_handle_selection_request does have GCPRO for that region.  As for
x_get_local_selection, if you are a real stickler, perhaps it should
have on for handler_fn, but in practice that won't matter.
No other Lisp value is live across that call.

But this crash has nothing to do with GCPRO, because GCPRO's are no-ops
on this configuration.  It uses the GC_MARK_STACK code instead.
The bug appears to be in that code.