https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97864
--- Comment #11 from Iain Sandoe <iains at gcc dot gnu.org> --- do you see this on mainline too? (I do not - but building a 10.x debug compiler at present) -- the trick will be to figure out what fortran patch(es) have apparently fixed this on mainline. There doesn't seem to be anything terribly darwin-specific in that backtrace.
