[Bug middle-end/64922] [5 Regression] runtime error: member call on misaligned address for type 'struct _Rep'

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64922

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Jan Hubicka from comment #6)
> Created attachment 34666 [details]
> Patch I am testing.
> 
> The following patch fixes the parameters, but I do not get any
> ubsan_unreachable calls. Jakub, can you take a look, please?

Have you compiled the testcase with -fsanitize=alignment,bool,enum -O2
-D_GLIBCXX_USE_CXX11_ABI=0 , against recentish libstdc++ headers?