Re: Breakpoint commands in MI mode and "backtrace"

[Eli Zaretskii <eliz at gnu dot org>]

> Date: Mon, 09 Oct 2017 10:27:15 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> CC: gdb@sourceware.org
> 
> > Cc: gdb@sourceware.org
> > From: Simon Marchi <simark@simark.ca>
> > Date: Mon, 9 Oct 2017 00:16:28 -0400
> > 
> > Hmm, strange.  It is a quite complex function being executed in the hookpost-backtrace.
> > Do you have any idea what line generates the error?  It would be nice to have a
> > reproducer without having to build emacs...
> 
> It's this line in xgetsysm:
> 
>     set $ptr = ((struct Lisp_Symbol *) ((char *)lispsym + $ptr))
> 
> where $ptr is a pointer to a Lisp_Symbol object:
> 
>   (gdb) p $ptr
>   $2 = (struct Lisp_Symbol *) 0x17c9e38 <dumped_data+267384>
> 
> and lispsym is an array:
> 
>   (gdb) ptype lispsym
>   type = struct {
>       struct Lisp_Symbol s;
>   } [1298]
> 
> Let me know if I can provide more information about this.

Btw, with the patch, I get the same error if I invoke GDB in CLI mode.

Thanks.