bug#63495: 28.2; menu crashes on macos

[Eshel Yaron]

Alan Third <alan@idiocy.org> writes:

>> > There's nothing obvious in that function that would be doing that,
>> > so it would be good if we could get a backtrace from a debugger
>> > showing the exact line that's causing the problem and, if possible,
>> > which variable has the value 3.
>> 
>> There's this backtrace that I've posted in Bug#62402, HTH:
>> 
>> > * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS 
>> > (code=1, address=0x3)
>> >   * frame #0: 0x00000001000aebad emacs`AREF(array=0x0000000000000000, 
>> > idx=0) at lisp.h:1947:10
>> >     frame #1: 0x00000001000af660 
>> > emacs`find_and_return_menu_selection(f=0x00000001100dee30, keymaps=true, 
>> > client_data=0x000000011089b888) at menu.c:985:11
>> >     frame #2: 0x0000000100380f2b emacs`-[EmacsMenu 
>> > runMenuAt:forFrame:keymaps:](self=0x00006000017007c0, 
>> > _cmd="runMenuAt:forFrame:keymaps:", p=(x = 2, y = 506), 
>> > f=0x00000001100dee30, keymaps=true) at nsmenu.m:767:9
>> >     frame #3: 0x0000000100381f00 emacs`ns_menu_show(f=0x00000001100dee30, 
>> > x=2, y=2, menuflags=1, title=0x0000000000000000, error=0x00007ff7bfefce80) 
>> > at nsmenu.m:1067:9
>> >     frame #4: 0x00000001000b1203 
>> > emacs`x_popup_menu_1(position=0x000000011804dcb3, menu=0x000000011804e003) 
>> > at menu.c:1410:17
>> >     frame #5: 0x00000001000b15a2 
>> > emacs`Fx_popup_menu(position=0x000000011804dcb3, menu=0x000000011804e003) 
>> > at menu.c:1474:10
>> >     frame #6: 0x0000000100247c58 emacs`eval_sub(form=0x000000011804dd23) 
>> > at eval.c:2503:15
>> >     ...
>> > 
>> > It seems that `find_and_return_menu_selection` in menu.c tries to
>> > access the global variable `menu_items` before it's initialized.  I'm
>> > not sure when or where it should be initialized though :(
>
> No, sorry, I need the output from a debugger. That should give the
> exact line where the failure happens.

I'm not sure I understand, this *is* the output from a debugger.  I ran
Emacs under lldb and got the above backtrace when it crashed.  It also
includes the exact line number(s).  What am I missing?