6b/0x1960
[   52.992008]   [<c027415e>] lock_acquire+0x7e/0xf0
[   52.992008]   [<c05f356d>] _raw_spin_lock_bh+0x3d/0x50
[   52.992008]   [<c0584e40>] mld_ifc_timer_expire+0xf0/0x280
[   52.992008]   [<c024cee6>] run_timer_softirq+0x146/0x310
[   52.992008]   [<c024591d>] __do_softirq+0xad/0x1c0
[   52.992008]
[   52.992008] to a SOFTIRQ-irq-unsafe lock:
[   52.992008]  (&bond->lock){++++..}
[   52.992008] ... which became SOFTIRQ-irq-unsafe at:
[   52.992008] ...  [<c0272c3b>] __lock_acquire+0x9bb/0x1960
[   52.992008]   [<c027415e>] lock_acquire+0x7e/0xf0
[   52.992008]   [<c05f36b8>] _raw_write_lock+0x38/0x50
[   52.992008]   [<efe4cbe4>] bond_vlan_rx_register+0x24/0x70 [bonding]
[   52.992008]   [<c0598010>] register_vlan_dev+0xc0/0x280
[   52.992008]   [<c0599f3a>] vlan_newlink+0xaa/0xd0
[   52.992008]   [<c04ed4b4>] rtnl_newlink+0x404/0x490
[   52.992008]   [<c04ece35>] rtnetlink_rcv_msg+0x1e5/0x220
[   52.992008]   [<c050424e>] netlink_rcv_skb+0x8e/0xb0
[   52.992008]   [<c04ecbac>] rtnetlink_rcv+0x1c/0x30
[   52.992008]   [<c0503bfb>] netlink_unicast+0x24b/0x290
[   52.992008]   [<c0503e37>] netlink_sendmsg+0x1f7/0x310
[   52.992008]   [<c04cd41c>] sock_sendmsg+0xac/0xe0
[   52.992008]   [<c04ceb80>] sys_sendmsg+0x130/0x230
[   52.992008]   [<c04cf04e>] sys_socketcall+0xde/0x280
[   52.992008]   [<c0202d10>] sysenter_do_call+0x12/0x36
[   52.992008]
[   52.992008] other info that might help us debug this:
...
[ Full info at netdev: Wed, 27 Oct 2010 12:24:30 +0200
  Subject: [BUG net-2.6 vlan/bonding] lockdep splats ]

Use BH variant of write_lock(&bond->lock) (as elsewhere in bond_main)
to prevent this dependency.

Fixes commit f35188faa0fbabefac476536994f4b6f3677380f [v2.6.36]

Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Tested-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Jay Vosburgh <fubar@us.ibm.com>
†