That's not the issue -- the issue is with the kernel dropping routes when
we loose an IP address.

rolling back:

Fri Mar  4 21:26:15 CET 2011  Juliusz Chroboczek <jch@pps.jussieu.fr>
  * Fix ordering of netlink messages when making a route unreachable.

  This should fix:

    netlink_read: File exists
    netlink_read: No such process

    M ./kernel_netlink.c -1 +1