https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80236
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2017-03-28
Ever confirmed|0 |1
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Usually this happens when you return a reference to an automatic variable thus
invalidly extend an objects lifetime after destruction.
Did you try -fsanitize=address or -fsanitize=undefined?
