https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118733

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is a race condition of having it existed and not existing from a different
thread. So yes this is undefined behavior.

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