Here's a similar crash from emacs 25.

On Tue, Dec 8, 2015 at 1:03 PM John Wiegley <jwiegley@gmail.com> wrote:

> >>>>> Eli Zaretskii <eliz@gnu.org> writes:
>
> >> $7 = (struct Lisp_Cons *) 0x6c20736c69747560
> >> Cannot access memory at address 0x6c20736c69747560
>
> > That "address" is part of a string: "`utils l" (without the quotes). So
> I'm
> > guessing some code is overwriting the stack or writing beyond the limits
> of
> > a char array. The question is where?
>
> Nice catch! Forgot to look for that.
>
> --
> John Wiegley                  GPG fingerprint = 4710 CF98 AF9B 327B B80F
> http://newartisans.com                          60E1 46C4 BD1A 7AC1 4BA2
>