https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77411

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Analysis at https://gcc.gnu.org/ml/gcc-patches/2016-08/msg01985.html :
...
The problem here is that the functions f2 and f3 access a stack-
based object out of bounds and that is inlined in main and
therefore smashes the return address of main in this case.
...

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