bug#9015: U+25B2, U+25BC in tabulated-list output crash emacs -nw

bug#9015: U+25B2, U+25BC in tabulated-list output crash emacs -nw

[Juanma Barranquero]

emacs -Q -nw -f list-processes

Breakpoint 1, w32_abort () at w32fns.c:7181
7181      button = MessageBox (NULL,
(gdb) bt
#0  w32_abort () at w32fns.c:7181
#1  0x011b27dd in produce_glyphs (it=0x88ca40) at term.c:1547
#2  0x01194192 in display_string (string=0x0, lisp_string=53116849,
face_string=53086234, face_string_pos=0, start=0, it=0x88ca40,
field_width=0,
    precision=37, max_x=150, multibyte=1) at xdisp.c:20027
#3  0x011906ce in display_mode_element (it=0x88ca40, depth=1,
field_width=0, precision=0, elt=53116849, props=53086234, risky=0) at
xdisp.c:18684
#4  0x0118fa4b in display_mode_line (w=0x34b4000,
face_id=HEADER_LINE_FACE_ID, format=53116849) at xdisp.c:18434
#5  0x0118f908 in display_mode_lines (w=0x34b4000) at xdisp.c:18388
#6  0x011826e0 in redisplay_window (window=55263237,
just_this_one_p=0) at xdisp.c:14539
#7  0x0117aadf in redisplay_window_0 (window=55263237) at xdisp.c:12457
#8  0x01033b74 in internal_condition_case_1 (bfun=0x117aaad
<redisplay_window_0>, arg=55263237, handlers=53070518,
    hfun=0x117aa8c <redisplay_window_error>) at eval.c:1538
#9  0x0117aa7c in redisplay_windows (window=55263237) at xdisp.c:12437
#10 0x0117a9eb in redisplay_windows (window=55181829) at xdisp.c:12431
#11 0x01178a1f in redisplay_internal () at xdisp.c:12014
#12 0x01175d1b in redisplay () at xdisp.c:11237
#13 0x010087fe in read_char (commandflag=1, nmaps=2, maps=0x88f9a0,
prev_event=53086234, used_mouse_menu=0x88fafc, end_time=0x0) at
keyboard.c:2444
#14 0x0101c0a7 in read_key_sequence (keybuf=0x88fc00, bufsize=30,
prompt=53086234, dont_downcase_last=0, can_return_switch_frame=1,
    fix_current_buffer=1) at keyboard.c:9283
#15 0x01005a51 in command_loop_1 () at keyboard.c:1445
#16 0x01033a64 in internal_condition_case (bfun=0x100545f
<command_loop_1>, handlers=53143986, hfun=0x1004c89 <cmd_error>) at
eval.c:1493
#17 0x010050c5 in command_loop_2 (ignore=53086234) at keyboard.c:1156
#18 0x01033424 in internal_catch (tag=53142010, func=0x10050a2
<command_loop_2>, arg=53086234) at eval.c:1247
#19 0x0100507d in command_loop () at keyboard.c:1135
#20 0x01004647 in recursive_edit_1 () at keyboard.c:756
#21 0x01004969 in Frecursive_edit () at keyboard.c:820
#22 0x010027eb in main (argc=5, argv=0xd92da8) at emacs.c:1698
(gdb)

The problem is caused by the characters U+25B2 BLACK UP-POINTING
TRIANGLE and U+25BC BLACK DOWN-POINTING TRIANGLE used in
`tabulated-list-init-header' to mark the sorting order.

bug#9015: U+25B2, U+25BC in tabulated-list output crash emacs -nw

[Eli Zaretskii]

> From: Juanma Barranquero <lekktu@gmail.com>
> Date: Thu, 7 Jul 2011 04:16:57 +0200
> 
> emacs -Q -nw -f list-processes
> 
> Breakpoint 1, w32_abort () at w32fns.c:7181
> 7181      button = MessageBox (NULL,
> (gdb) bt
> #0  w32_abort () at w32fns.c:7181
> #1  0x011b27dd in produce_glyphs (it=0x88ca40) at term.c:1547

What is the value of it->what in this frame (frame #1)?  If it's
IT_GLYPHLESS, then I have just fixed that on the trunk (the problem
was that xassert didn't allow IT_GLYPHLESS, while the code below
clearly handles it).  If it->what is something else, please reopen the
bug.

(Ironically, I found and fixed just a few days ago this same bug on my
local branch where I work on bidi.)

> The problem is caused by the characters U+25B2 BLACK UP-POINTING
> TRIANGLE and U+25BC BLACK DOWN-POINTING TRIANGLE used in
> `tabulated-list-init-header' to mark the sorting order.

I thought Chong installed a change that was supposed to DTRT with
these characters on a TTY?