crash when selecting menu items (GTK)

[Simon Josefsson]

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Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

gtkutil.c:1818 calls strcmp() on a NULL pointer.

(gdb) r
Starting program: /home/jas/bin/emacs -geometry 80x40+0+0

(emacs:31785): Gtk-CRITICAL **: file gtklabel.c: line 1954 
(gtk_label_set_text_with_mnemonic): assertion `str != NULL' failed

Program received signal SIGSEGV, Segmentation fault.
0x4060f254 in strcmp () from /lib/libc.so.6
(gdb) bt
#0  0x4060f254 in strcmp () from /lib/libc.so.6
#1  0x080d5ca1 in xg_update_menu_item (val=0x912fb30, w=0x8f3e848,
    select_cb=0x80763d8 <menubar_selection_callback>,
    highlight_cb=0x807620c <menu_highlight_callback>, cl_data=0x858a320)
    at gtkutil.c:1818
#2  0x080d6187 in xg_update_submenu (submenu=0x9422bb8, f=0x8466380,
    val=0x9283510, select_cb=0x80763d8 <menubar_selection_callback>,
    deactivate_cb=0x8076144 <popup_deactivate_callback>,
    highlight_cb=0x807620c <menu_highlight_callback>, cl_data=0x858a320)
    at gtkutil.c:1988
#3  0x080d61e8 in xg_update_submenu (submenu=0x8f3b208, f=0x8466380,
    val=0x9322650, select_cb=0x80763d8 <menubar_selection_callback>,
    deactivate_cb=0x8076144 <popup_deactivate_callback>,
    highlight_cb=0x807620c <menu_highlight_callback>, cl_data=0x858a320)
    at gtkutil.c:2002
#4  0x080d639d in xg_modify_menubar_widgets (menubar=0x858a2c0, f=0x8466380,
    val=0x8571d10, deep_p=1, select_cb=0x80763d8 <menubar_selection_callback>,
    deactivate_cb=0x8076144 <popup_deactivate_callback>,
    highlight_cb=0x807620c <menu_highlight_callback>) at gtkutil.c:2109
#5  0x08076f2c in set_frame_menubar (f=0x8466380, first_time=0, deep_p=1)
    at xmenu.c:2065
#6  0x080760b2 in x_activate_menubar (f=0x8466380) at xmenu.c:1219
#7  0x080dddd4 in kbd_buffer_get_event (kbp=0xbffff13c,
---Type <return> to continue, or q <return> to quit---
    used_mouse_menu=0xbffff33c) at keyboard.c:3890
#8  0x080dc516 in read_char (commandflag=1, nmaps=4, maps=0xbffff2f0,
    prev_event=405445916, used_mouse_menu=0xbffff33c) at keyboard.c:2743
#9  0x080e2ad0 in read_key_sequence (keybuf=0xbffff440, bufsize=30,
    prompt=405445916, dont_downcase_last=0, can_return_switch_frame=1,
    fix_current_buffer=1) at keyboard.c:8531
#10 0x080da358 in command_loop_1 () at keyboard.c:1474
#11 0x0812ec4d in internal_condition_case (bfun=0x80da050 <command_loop_1>,
    handlers=405542524, hfun=0x80d9c64 <cmd_error>) at eval.c:1351
#12 0x080d9f28 in command_loop_2 () at keyboard.c:1274
#13 0x0812e7c5 in internal_catch (tag=405503828,
    func=0x80d9f04 <command_loop_2>, arg=405445916) at eval.c:1112
#14 0x080d9ed3 in command_loop () at keyboard.c:1253
#15 0x080d9a20 in recursive_edit_1 () at keyboard.c:969
#16 0x080d9b50 in Frecursive_edit () at keyboard.c:1025
#17 0x080d89e3 in main (argc=3, argv=0xbffffa04) at emacs.c:1659
(gdb) up
#1  0x080d5ca1 in xg_update_menu_item (val=0x912fb30, w=0x8f3e848,
    select_cb=0x80763d8 <menubar_selection_callback>,
    highlight_cb=0x807620c <menu_highlight_callback>, cl_data=0x858a320)
    at gtkutil.c:1818
1818      if (strcmp (utf8_label, gtk_label_get_label (wlbl)) != 0)
(gdb) p utf8_label
$1 = 0x0
(gdb) p wlbl
$2 = (GtkLabel *) 0x9425b08
(gdb) p *wlbl
$3 = {
  misc = {
    widget = {
      object = {
        parent_instance = {
          g_type_instance = {
            g_class = 0x858e588
          },
          ref_count = 1,
          qdata = 0x912a8c8
        },
        flags = 2098976
      },
      private_flags = 15872,
      state = 0 '\0',
      saved_state = 0 '\0',
      name = 0x0,
      style = 0x851a108,
      requisition = {
        width = 0,
        height = 0
      },
      allocation = {
---Type <return> to continue, or q <return> to quit---
        x = -1,
        y = -1,
        width = 1,
        height = 1
      },
      window = 0x0,
      parent = 0x8f3e848
    },
    xalign = 0,
    yalign = 0.5,
    xpad = 0,
    ypad = 0
  },
  label = 0x9425ac8 "",
  jtype = 0,
  wrap = 0,
  use_underline = 0,
  use_markup = 0,
  mnemonic_keyval = 16777215,
  text = 0x9425b98 "",
  attrs = 0x0,
  effective_attrs = 0x0,
  layout = 0x0,
---Type <return> to continue, or q <return> to quit---
  mnemonic_widget = 0x0,
  mnemonic_window = 0x0,
  select_info = 0x0
}
(gdb)



In GNU Emacs 21.3.50.5 (i686-pc-linux-gnu)
 of 2003-01-25 on latte.josefsson.org
configured using `configure '--with-gtk''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Recent input:
<help-echo> M-x r e p o r <tab> <return>

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