Re: Breakpoint commands in MI mode and "backtrace"

> Cc: [email protected]
> From: Simon Marchi <[email protected]>
> 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.