Both, openrc and netifrc provide their own ways to configuring local loopback virtual interface. Those 2 are conflicting (like only one of those can be started at any time). I believe openrc with USE="netifrc" should not install /etc/init.d/loopback file, leaving it's job to /etc/init.d/net.lo. This way would also make updates from openrc-11 smoother. Reproducible: Always
Loopback is the succesor of net.lo. But net.lo shouldn't be used anymore, see bug 490750. So maybe both bugs could be fixed if net.lo would be removed from net-misc/netifrc...
Mh, this is a duplicate of bug 490750. net.lo is still used for creating your interfaces, e.g. ln -s /etc/init.d/net.lo /etc/init.d/net.eth0 So we cannot get rid of it. But as said, it is not used at boot runlevel anymore, because it was replaced by loopback. And this needs to be handled, see bug 490750.
The netifrc use flag was never meant to be a permanent solution for installing netifrc. I am working with the folks on -dev to come up with a better way to do that for folks who want it but to get rid of this use flag in OpenRC, since openrc really doesn't need netifrc.
*** This bug has been marked as a duplicate of bug 490750 ***