Comment 2 for bug 1235162

Here's a reference in dmesg during boot about eth4 - but no mention of the other interfaces:

 systemd-udevd[1307]: error changing net interface name eth4 to eth3: File exists

$ grep eth /var/log/dmesg
[ 0.960091] forcedeth: Reverse Engineered nForce ethernet driver. Version 0.64.
[ 0.960379] forcedeth 0000:00:07.0: setting latency timer to 64
[ 1.132202] e1000e 0000:04:00.0 eth0: (PCI Express:2.5GT/s:Width x4) 00:15:17:8f:99:c1
[ 1.132281] e1000e 0000:04:00.0 eth0: Intel(R) PRO/1000 Network Connection
[ 1.132426] e1000e 0000:04:00.0 eth0: MAC: 0, PHY: 4, PBA No: D72468-003
[ 1.309738] e1000e 0000:04:00.1 eth1: (PCI Express:2.5GT/s:Width x4) 00:15:17:8f:99:c0
[ 1.309739] e1000e 0000:04:00.1 eth1: Intel(R) PRO/1000 Network Connection
[ 1.309815] e1000e 0000:04:00.1 eth1: MAC: 0, PHY: 4, PBA No: D72468-003
[ 1.482147] forcedeth 0000:00:07.0: ifname eth2, PHY OUI 0x732 @ 1, addr 00:25:22:75:e6:9e
[ 1.482227] forcedeth 0000:00:07.0: highdma pwrctl mgmt lnktim msi desc-v3
[ 1.486796] e1000e 0000:05:00.0 eth3: (PCI Express:2.5GT/s:Width x4) 00:15:17:8f:99:c3
[ 1.486891] e1000e 0000:05:00.0 eth3: Intel(R) PRO/1000 Network Connection
[ 1.487040] e1000e 0000:05:00.0 eth3: MAC: 0, PHY: 4, PBA No: D72468-003
[ 1.761606] e1000e 0000:05:00.1 eth4: (PCI Express:2.5GT/s:Width x4) 00:15:17:8f:99:c2
[ 1.761619] e1000e 0000:05:00.1 eth4: Intel(R) PRO/1000 Network Connection
[ 1.761704] e1000e 0000:05:00.1 eth4: MAC: 0, PHY: 4, PBA No: D72468-003
[ 17.115278] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 17.115285] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready
[ 17.115289] IPv6: ADDRCONF(NETDEV_UP): eth2: link is not ready
[ 17.115294] IPv6: ADDRCONF(NETDEV_UP): eth3: link is not ready
[ 17.115298] IPv6: ADDRCONF(NETDEV_UP): eth4: link is not ready
[ 18.813099] systemd-udevd[1307]: error changing net interface name eth4 to eth3: File exists