[resend] Hello,
Starting with commit de77ecd4ef02ca783f7762e04e92b3d0964be66b, and through 4.12.2, the bonding driver in 802.3ad mode fails to enable the second interface on a bond device if updelay is non-zero. dmesg says: [ 35.825227] bond0: Setting xmit hash policy to layer3+4 (1) [ 35.825259] bond0: Setting MII monitoring interval to 100 [ 35.825303] bond0: Setting down delay to 200 [ 35.825328] bond0: Setting up delay to 200 [ 35.827414] bond0: Adding slave eth0 [ 35.949205] bond0: Enslaving eth0 as a backup interface with a down link [ 35.950812] bond0: Adding slave eth1 [ 36.073764] bond0: Enslaving eth1 as a backup interface with a down link [ 36.076808] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 39.327423] igb 0000:01:00.0 eth0: igb: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX [ 39.405580] bond0: link status up for interface eth0, enabling it in 0 ms [ 39.405607] bond0: link status definitely up for interface eth0, 1000 Mbps full duplex [ 39.405608] bond0: Warning: No 802.3ad response from the link partner for any adapters in the bond [ 39.405613] bond0: first active interface up! [ 39.406186] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 39.551391] igb 0000:01:00.1 eth1: igb: eth1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX [ 39.613590] bond0: link status up for interface eth1, enabling it in 200 ms [ 39.717575] bond0: link status up for interface eth1, enabling it in 200 ms [ 39.821395] bond0: link status up for interface eth1, enabling it in 200 ms [ 39.925584] bond0: link status up for interface eth1, enabling it in 200 ms [ 40.029288] bond0: link status up for interface eth1, enabling it in 200 ms [ 40.133388] bond0: link status up for interface eth1, enabling it in 200 ms ...and so on every 100 ms. The bug doesn't trigger 100% reliably, but can be provoked by removing and re-adding interfaces to the bond via sysfs. While the problem is occurring, networking appears to be unreliable. Setting the updelay to 0 fixes it: [ 345.472559] bond0: link status up for interface eth1, enabling it in 200 ms [ 345.576558] bond0: link status up for interface eth1, enabling it in 200 ms [ 345.607614] bond0: Setting up delay to 0 [ 345.680396] bond0: link status definitely up for interface eth1, 1000 Mbps full duplex I'd be happy to provide further details or to test patches. --Benjamin Gilbert
