Comment 3 for bug 1857811

The interesting part in emerge.log is:

  23473 socket(16,,IPPROTO_IP) = 5
  23473 bind(5,274886353720,12,0,1,274889671712) = 0
  23473 sendto(5,275542232672,38,0,274886353960,12) = -1 errno=95 (Operation not supported)
  23473 close(5) = 0
  Unable to configure loopback interface: Operation not supported

So you're right 16 is AF_NETLINK

At QEMU level only one function returns EOPNOTSUPP, the one managing RTM_* operations (RTM_GETLINK, RTM_GETADDR, ...) and it doesn't manage a bunch of them.

Could you provide a step by step example to reproduce the problem?