The Ubuntu bug: https://bugs.launchpad.net/ubuntu/+source/emacs25/+bug/1656474
Memory corruption reported on mailing list: http://lists.gnu.org/archive/html/emacs-devel/2017-03/msg00827.html It looks like Emacs Lisp may be involved. Does Emacs Lisp use tagged pointers? Pointers have fairly recently become 48-bit on arm64, which has broken some other programs. (However, the symptoms aren't a very good match: breakage from the move to 48 bits would typically give you a consistent failure on systems that use 48-bit pointers with the faulting address looking like a correct address but with the top bits wrong, which isn't what's described on the mailing list; see link above.)
