https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82831
--- Comment #12 from Eric Botcazou <ebotcazou at gcc dot gnu.org> --- > IMO turning random hot block into cold is not safe operatoin after > bbro is finished and thus Martin's patch preventing it is good. We can > indeed track down the real cause (I plan to iterate over profile updating > bugs > next week) We will never track the real cause if we paper over it...