bug#29326: 26.0.90; Emacs crash on running comment-dwim

[Eli Zaretskii]

> From: Kaushal Modi <kaushal.modi@gmail.com>
> Date: Fri, 17 Nov 2017 17:11:53 +0000
> Cc: 29326@debbugs.gnu.org
> 
>  > In this call frame #3, what is the value of ZV?
> 
>  Same question about the value of Z.
> 
> (gdb) f 2
> #2  0x00000000006232d5 in die (msg=0x723428 "charpos < 0 || (charpos >= 
> BUF_BEG (current_buffer) &&
> charpos <= ZV)",
>     file=0x72313d "xdisp.c", line=2752) at alloc.c:7419
> 7419      terminate_due_to_signal (SIGABRT, INT_MAX);
> (gdb) p ZV
> $1 = 263
> (gdb) p charpos
> No symbol "charpos" in current context.
> (gdb) f 2
> #2  0x00000000006232d5 in die (msg=0x723428 "charpos < 0 || (charpos >= 
> BUF_BEG (current_buffer) &&
> charpos <= ZV)",
>     file=0x72313d "xdisp.c", line=2752) at alloc.c:7419
> 7419      terminate_due_to_signal (SIGABRT, INT_MAX);
> (gdb) p charpos
> No symbol "charpos" in current context.
> 
> (gdb) f 3
> #3  0x0000000000449caa in init_iterator (it=0x7fffffff22f0, w=0x1593770, 
> charpos=360, bytepos=360,
> row=0x7511660,
>     base_face_id=DEFAULT_FACE_ID) at xdisp.c:2751
> 2751      eassert (charpos < 0 || (charpos >= BUF_BEG (current_buffer)
> (gdb) p ZV
> $2 = 263
> (gdb) p Z
> $3 = 263
> (gdb) 

Thanks, I need to see the results of xbacktrace, please.