It's the infiniband patch; reverting edb181c fixes the bug for me. It seems to make this noise on ifdown, but not ifup. It's not clear why this happens, since it looks like the reference to %vlan_id1% is protected by
test -d /sys/class/net/%link%/device/infiniband which certainly is not true on my system (tested no presence of 'inifinband' in my whole /sys on either side of link up... this happens for ordinary wlan0 on my machine). The only thing I'll note is that there looks like maybe a subtle logic change replacing: /bin/ip link del %iface% if (iface_has(".") && (!iface_has(":")) && (!var_set_anywhere("bridge_ports", ifd))) with: /bin/ip link del %iface%; \ fi if (iface_has(".") && (!iface_has(":")) && (!var_set_anywhere("bridge_ports", ifd))); Also, the trailing 'fi;' in the first block has a slightly different indent and does not line up with the 'else', if that matters.