Comment # 6 on bug 953051 from Michael Chang

I didn't see relevant changes that could regress grub2-mkpasswd-pbkdf2 .. 

Maybe 'echo' shell builtin needs explicit '-e' ? Otherwise we could pass single
line input to grub2-mkpasswd-pbkdf2 and somehow it misbehaves for premature EOF
in the stream .. ?

echo -e 'test\ntest' | LANG=C grub2-mkpasswd-pbkdf2

At least it works for me.