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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: SEGV in x_catch_errors_unwind (x86_64-unknown-linux-gnu)
Date: Sun, 26 Feb 2006 11:00:19 -0500
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    Even surrounding the entire body of unbind_to with a
    BLOCK_INPUT/UNBLOCK_INPUT pair did not avoid the crash, though it took
    nearly 20 attempts to trigger it.

There must be another place that is sensitive to a similar bug.
Here's one:

record_unwind_protect (function, arg)
     Lisp_Object (*function) P_ ((Lisp_Object));
     Lisp_Object arg;
{
  if (specpdl_ptr == specpdl + specpdl_size)
    grow_specpdl ();
  specpdl_ptr->func = function;
  specpdl_ptr->symbol = Qnil;
  specpdl_ptr->old_value = arg;
  specpdl_ptr++;

I think specbind is another.