Comment 3 for bug 658460

These symptoms seems similar to mine with a little extra twist.

When adding a vlan to a bonding interface, all vlan tagged broadcasts seems to arrive twice on the bonding interface according to tcpdump. Remove the vlan and the double packets stop.

Ie.

modprobe bonding mode=1 miimon=100
ip link set bond0 up
ifenslave bond0 eth0 eth1
tcpdump -i bond0 -nes0
<normal vlan tagged traffic observed>
vconfig add bond0 1000
tcpdump -i bond0 -nes0
<vlan tagged broadcasts appears twice in dump>

This MAY be the cause of the periodical network outages I experience with kvm guests on a Maverick host. It seems like arp req/replies aren't handled correctly/at all.