https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94849
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
So it might be well defined on Windows, but unless glibc documents it as an
extension, it is not valid on Linux.
C clearly says: "The fopen function opens the file whose name is the string
pointed to by filename" and NULL is not a pointer to a string.  Same POSIX,
e.g. in 1003.1-2017.  So, just don't do this, you invoke undefined behavior,
and one such behavior is that it crashes with the sanitizers.

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