I upgraded from 3.4 to 4.1 and got a WARNING I'd never seen before: [ 14.389529] bond0: Setting MII monitoring interval to 100 [ 14.389653] bond0: MII monitoring cannot be used with ARP monitoring - disabling ARP monitoring... [ 14.390613] bond0: link status definitely down for interface eth0, disabling it [ 14.390755] bond0: making interface eth1 the new active one [ 14.390862] ------------[ cut here ]------------ [ 14.390866] WARNING: CPU: 0 PID: 115 at kernel/softirq.c:150 __local_bh_enable_ip+0x6f/0xa0() [ 14.390882] Modules linked in: nf_conntrack_ftp ip6t_REJECT nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter xt_length xt_NFLOG xt_limit nf_conntrack_ipv4 nf_defrag_ipv4 xt_recent xt_owner xt_set xt_multiport xt_conntrack nf_conntrack ip_set_hash_net ip_set nfnetlink_log nfnetlink ipmi_poweroff ipmi_devintf nfsd nfs_acl auth_rpcgss oid_registry nfs lockd grace sunrpc netconsole bonding i2c_i801 lpc_ich mfd_core ehci_pci ehci_hcd ipmi_si ipmi_msghandler igb dca i2c_algo_bit ptp pps_core hwmon usbhid usbcore usb_common [ 14.390883] CPU: 0 PID: 115 rUID: 0 rGID: 0 Comm: kworker/u16:4 Not tainted 4.1.4 #2 [ 14.390884] Hardware name: Supermicro X10SLH-F/X10SLM+-F/X10SLH-F/X10SLM+-F, BIOS 2.00 04/24/2014 [ 14.390887] Workqueue: bond0 bond_mii_monitor [bonding] [ 14.390889] 0000000000000096 ffff8807fa027798 ffffffff9b7388fc ffff8807fa0277d8 [ 14.390890] ffffffff9b06f4a0 ffff8807fa0277c8 0000000000000200 ffff8807f9f543c8 [ 14.390890] ffff8800016b4780 ffffffffc0210b80 ffff8807fa027830 ffff8807fa0277e8 [ 14.390891] Call Trace: [ 14.390894] [<ffffffff9b7388fc>] dump_stack+0x68/0x74 [ 14.390896] [<ffffffff9b06f4a0>] warn_slowpath_common+0x90/0xd0 [ 14.390898] [<ffffffff9b06f4f5>] warn_slowpath_null+0x15/0x20 [ 14.390899] [<ffffffff9b073a6f>] __local_bh_enable_ip+0x6f/0xa0 [ 14.390901] [<ffffffffc0276c41>] bond_poll_controller+0x101/0x140 [bonding] [ 14.390904] [<ffffffff9b62915d>] netpoll_poll_dev+0x6d/0x1a0 [ 14.390905] [<ffffffff9b6293fc>] netpoll_send_skb_on_dev+0x16c/0x270 [ 14.390906] [<ffffffff9b6297cf>] netpoll_send_udp+0x2cf/0x420 [ 14.390907] [<ffffffffc029c2d5>] write_msg+0xc5/0x110 [netconsole] [ 14.390910] [<ffffffff9b0b7080>] call_console_drivers+0xc0/0xe0 [ 14.390911] [<ffffffff9b0b8dc7>] console_unlock+0x317/0x400 [ 14.390913] [<ffffffff9b0b9e4e>] vprintk_emit+0x2ce/0x530 [ 14.390914] [<ffffffff9b0ba0ca>] vprintk_default+0x1a/0x20 [ 14.390915] [<ffffffff9b7387a5>] printk+0x6c/0x6e [ 14.390917] [<ffffffff9b0ba0ca>] ? vprintk_default+0x1a/0x20 [ 14.390918] [<ffffffff9b7387a5>] ? printk+0x6c/0x6e [ 14.390919] [<ffffffff9b092710>] ? check_preempt_curr+0x90/0xb0 [ 14.390921] [<ffffffff9b607182>] __netdev_printk+0x152/0x310 [ 14.390923] [<ffffffff9b6073bf>] netdev_info+0x7f/0x90 [ 14.390925] [<ffffffff9b6073bf>] ? netdev_info+0x7f/0x90 [ 14.390927] [<ffffffff9b0880ca>] ? __queue_work+0x1ba/0x350 [ 14.390930] [<ffffffffc02790bd>] bond_change_active_slave+0x13d/0x6f0 [bonding] [ 14.390932] [<ffffffffc0279861>] bond_select_active_slave+0x121/0x1f0 [bonding] [ 14.390934] [<ffffffffc027ab13>] bond_mii_monitor+0x5e3/0x740 [bonding] [ 14.390935] [<ffffffff9b088b7c>] process_one_work+0x18c/0x4a0 [ 14.390936] [<ffffffff9b088fba>] worker_thread+0x12a/0x5d0 [ 14.390938] [<ffffffff9b088e90>] ? process_one_work+0x4a0/0x4a0 [ 14.390939] [<ffffffff9b08e44b>] kthread+0xdb/0xf0 [ 14.390940] [<ffffffff9b08e370>] ? kthread_freezable_should_stop+0x70/0x70 [ 14.390942] [<ffffffff9b73d5e2>] ret_from_fork+0x42/0x70 [ 14.390943] [<ffffffff9b08e370>] ? kthread_freezable_should_stop+0x70/0x70 [ 14.390944] ---[ end trace 4f1bbf12d3a796a0 ]--- [ 14.548673] bond0: link status definitely down for interface eth1, disabling it [ 14.548995] bond0: now running without any active interface! [ 14.590642] bond0: Setting ARP monitoring interval to 500