Dear Eli,

tonight the emacs delivered with Archlinux has updated itself to GNU Emacs 26.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30) of 2018-05-29. You might be interested that the crash persists (scenario to provoke it unchanged).

I attach you the backtrace (before and after processing with sed and addr2line) and will look into options to get an emacs version with debugging symbols (might take a moment, unfortunately).

Best regards,

Marc