bug#12745: crash in bidi_pop_it during (idle) redisplay

[Eli Zaretskii <eliz@gnu.org>]

> Date: Sun, 28 Oct 2012 21:26:55 -0700
> From: Ami Fischman <ami@fischman.org>
> Cc: 12745@debbugs.gnu.org
> 
> > If it loads the same .emacs, that is good enough.
> >
> 
> Ok, attached.

Thanks.

> (gdb) p current_buffer->name_
> $22 = 101548849
> (gdb) xtype
> Lisp_String
> (gdb) xstring current_buffer->name_
> $23 = (struct Lisp_String *) 0x60d8330
>   "cdm_wrapper.cc"

OK, so we were looking at the correct buffer.

> > Did that buffer have any minor mode or some other optional feature
> > turned on, in addition to C++ Mode?
> 
> 
> See attached b-g-e.txt, in which the current buffer is the same .cc file in
> my HEAD session loading the same .emacs as the crashed one.

Fwew!  There are quite a few minor modes you have turned on that use
overlays to do their job.  Coupled with the fact that the problem
happens after hours of work, I don't think a reproducible recipe will
be possible any time soon.  Hmmm...

> > So are you debugging a core dump?
> >
> 
> Yes.

Well, I hope that now you are running under GDB to begin with, because
debugging a live Emacs process is so much easier than debugging a core
dump.

Thanks.