This Gentoo bug has caused me to waste a lot of hours. I can’t believe they haven’t fixed it properly yet.
EDIT: The problem manifests itself after a fresh install of Gentoo on an AMD64 system. If you upgrade everything it will barf after glibc. You will start seeing errors such as
libsandbox: Can’t resolve open: (null)
The frustrating part for me was having a previous hardware problem that I thought I hadn’t actually solved because of this error starting to happen.
On a note to myself, put the damn details in the post. That way you can find things in the future when you search for them.