Hi Dave, The 4.4-rc7 kernel is failing for me. In my case, all of my vlan interfaces are failing to obtain a dhcp address using dhclient. I've tried a hand built 4.4-rc7, and the Fedora rawhide 4.4-rc7 kernel, both failed. I've tried NetworkManager and the old SysV network service, both fail. I tried a working dhclient from rhel7 on the Fedora rawhide install and it failed too. Running tcpdump on the interface shows the dhcp request going out, and a dhcp response coming back in. Running strace on dhclient shows that it writes the dhcp request, but it never recvs a dhcp response. If I manually bring the interface up with a static IP address then I'm able to run typical IP traffic across the link (aka, ping). It would seem that when dhclient registers a packet filter on the socket, that filter is preventing it from ever getting the dhcp response. The same dhclient works on any non-vlan interfaces in the system, so the filter must work for non-vlan interfaces. Aside from the fact that the interface is a vlan, we also use a priority egress map on the interface, and we use PFC flow control. Let me know if you need anymore to debug the issue, or email me off list and I can get you logins to my reproducer machines.
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Doug Ledford <dledf...@redhat.com>
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