bug#15405: 24.3; #[] freezes emacs

[Eli Zaretskii <eliz@gnu.org>]

> Date: Wed, 18 Sep 2013 10:36:36 -0400
> From: Barry OReilly <gundaetiapo@gmail.com>
> 
> I didn't witness a freeze, but I opened emacs -Q, did M-: #[] twice,
> moved point around without a problem, then did C-x 3 and Emacs core
> dumped.

Doesn't happen here, but my Emacs is compiled without optimizations,
FWIW.

> Core was generated by `emacs --reverse-video -Q'.
> Program terminated with signal 11, Segmentation fault.
> #0  0x00000031cfc0e7fd in raise () from /lib64/libpthread.so.0
> (gdb) bt
> #0  0x00000031cfc0e7fd in raise () from /lib64/libpthread.so.0
> #1  0x00000000004d0e35 in terminate_due_to_signal (sig=11,
> backtrace_limit=40) at emacs.c:369
> #2  0x00000000004ea6fe in handle_fatal_signal (sig=11227) at sysdep.c:1626
> #3  0x00000000004eaab3 in deliver_thread_signal (sig=11) at sysdep.c:1600
> #4  deliver_fatal_thread_signal (sig=11) at sysdep.c:1638
> #5  <signal handler called>
> #6  0x0000000000554a72 in AREF (f=0x11093b0, spec=11925893) at lisp.h:1170
> #7  font_delete_unmatched (f=0x11093b0, spec=11925893) at font.c:2624
> #8  font_list_entities (f=0x11093b0, spec=11925893) at font.c:2747
> #9  0x0000000000558574 in font_find_for_lface (f=0x11093b0,
> attrs=0x7fff12382d00, spec=11845218, c=-1) at font.c:3206
> #10 0x0000000000558a6b in font_load_for_lface (f=0x8091c5, attrs=0xb8c2f2,
> spec=8425920) at font.c:3276
> #11 0x00000000004a1882 in realize_x_face (cache=0xd8eb80,
> attrs=0x7fff12382d00, former_face_id=<value optimized out>) at xfaces.c:5529
> #12 realize_face (cache=0xd8eb80, attrs=0x7fff12382d00,
> former_face_id=<value optimized out>) at xfaces.c:5422
> #13 0x00000000004a2661 in lookup_face (f=<value optimized out>,
> attr=0x7fff12382d00) at xfaces.c:4411
> #14 0x00000000004a36b1 in face_at_string_position (w=<value optimized out>,
> string=<value optimized out>, pos=<value optimized out>, bufpos=0,
> region_beg=-1, region_end=-1, endptr=0x7fff12382e10,
>     base_face_id=MODE_LINE_INACTIVE_FACE_ID, mouse_p=0) at xfaces.c:6194
> #15 0x000000000044688c in display_string (string=0xb533e8 "*scratch*",
> lisp_string=11874225, face_string=15529169, face_string_pos=1, start=<value
> optimized out>, it=0x7fff12383050, field_width=12, precision=-8,
>     max_x=<value optimized out>, multibyte=0) at xdisp.c:22278
> #16 0x0000000000446f3c in display_mode_element (it=0x7fff12383050, depth=4,
> field_width=0, precision=-8, elt=<value optimized out>, props=11845218,
> risky=0) at xdisp.c:21031
> #17 0x0000000000447570 in display_mode_element (it=0x7fff12383050, depth=3,
> field_width=0, precision=-8, elt=<value optimized out>, props=11845218,
> risky=0) at xdisp.c:21203
> #18 0x0000000000447570 in display_mode_element (it=0x7fff12383050, depth=1,
> field_width=0, precision=0, elt=<value optimized out>, props=11845218,
> risky=0) at xdisp.c:21203
> #19 0x0000000000447e44 in display_mode_line (w=<value optimized out>,
> face_id=MODE_LINE_INACTIVE_FACE_ID, format=15394390) at xdisp.c:20720

This crash happens when Emacs tries to display the mode line of the
non-selected window.  Can you show the values of vec and of i in frame
#7?