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bug#15688: 24.3.50; clear-temporary-overlay-map

From: Richard Stallman
Subject: bug#15688: 24.3.50; clear-temporary-overlay-map
Date: Fri, 07 Mar 2014 13:39:21 -0500

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It crashed again.  This time the slot pointed to was again in
Fgarbage_collect, but it was 80(sp).  That's where the variable
message_p (char) is stored.  The value of message_p is 0,
but it happens that the low 8 bits of the address of clear-temporary-map
are zero, so storing the value of message_p into that byte didn't
alter the pointer in the word.

What seems fishy here is that clear-temporary-map still points to
that vectorlike even though the vectorlike has been freed.
Maybe that's where the real bug is.  Why didn't this code

                symbol_free_list->function = Vdead;

prevent the problem?

Dr Richard Stallman
President, Free Software Foundation
51 Franklin St
Boston MA 02110
www.fsf.org  www.gnu.org
Skype: No way! That's nonfree (freedom-denying) software.
  Use Ekiga or an ordinary phone call.

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