Hi, As weird as that sounds, this is what I observed today after bumping kernel version. I have a setup where 2 bonds are attached to linux bridge and physically are connected to two switches doing MSTP (and linux bridge is just passing them).
Initially I suspected some changes related to bridge code - but quick peek at the code showed nothing suspicious - and the part of it that explicitly passes stp frames if stp is not enabled has seen little changes (e.g. per-port group_fwd_mask added recently). Furthermore - if regular non-bonded interfaces are attached everything works fine. Just to be sure I detached the bond (802.3ad mode) and checked it with simple tcpdump (ether proto \\stp) - and indeed no hello packets were there (with them being present just fine on active enslaved interface, or on the bond device in earlier kernels). If time permits I'll bisect tommorow to pinpoint the commit, but from quick todays test - 4.9.x is working fine, while 4.16.16 (tested on debian) and 4.17.3 (tested on archlinux) are failing. Unless this is already a known issue (or you have any suggestions what could be responsible).
