bonding 802.3ad mode with bridge and tap devices

Hello,

i'm using KVM with tapdevices on vanilla 3.7.7 kernel.

Layout:

eth0 ------
           | -- bond0 --- vmbr0 ---- tap
eth1 ------

This works fine as long as i use active-backup mode. But if i switch to
802.3ad mode the host using vmbr0 as his default gw works fine but the
tap device does not.

It starts to work fine again if i set eth0/eth1 into promiscious mode.
Is this a kernel bug or my fault?

Thanks!

Greets,
Stefan