bug#33530: 26.1.90; D-Bus crashes Emacs: consp, Fatal error 7: Bus error

[Eli Zaretskii <eliz@gnu.org>]

> From: Damien Cassou <damien@cassou.me>
> Cc: 33530@debbugs.gnu.org, eggert@cs.ucla.edu, michael.albinus@gmx.de
> Date: Wed, 28 Nov 2018 10:28:47 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> > Can you please show the value of 'data' in frame #10 or in frame #5,
> > in human-readable form?  This should be possible using the "xtype"
> > command followed by another x* command, according to what type is
> > shown by "xtype", probably "xsymbol".
> 
> I would like to do that but I lack knowledge of gdb. Here is what I came
> up with:
> 
> (gdb) frame 10
> #10 0x00000000005911d8 in cmd_error_internal (data=XIL(0x1347253), context=0x7fffffffce90 "") at keyboard.c:972
> 972	    call3 (Vcommand_error_function, data,
> 
> (gdb) p data
> $1 = XIL(0x1347253)
> 
> (gdb) xtype
> Lisp_Cons
> 
> (gdb) xcons

Use "pp data" instead, it's better with conses, because it avoids the
need to manually drill down into each cons cell.

Thanks.