device bridge_slave_1 left promiscuous mode
bridge0: port 2(bridge_slave_1) entered disabled state
device bridge_slave_0 left promiscuous mode
bridge0: port 1(bridge_slave_0) entered disabled state
------------[ cut here ]------------
WARNING: CPU: 1 PID: 2049 at lib/debugobjects.c:289 debug_print_object+0x17b/0x210 lib/debugobjects.c:286
ODEBUG: assert_init not available (active state 0) object type: timer_list hint:           (null)
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 2049 Comm: kworker/u4:3 Not tainted 4.10.0+ #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
Workqueue: netns cleanup_net
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0xe6/0x120 lib/dump_stack.c:52
 panic+0x1b6/0x358 kernel/panic.c:180
 __warn+0x18d/0x1b0 kernel/panic.c:541
 warn_slowpath_fmt+0x92/0xb0 kernel/panic.c:564
 debug_print_object+0x17b/0x210 lib/debugobjects.c:286
 debug_object_assert_init+0x249/0x340 lib/debugobjects.c:652
 debug_timer_assert_init kernel/time/timer.c:706 [inline]
 debug_assert_init kernel/time/timer.c:754 [inline]
 del_timer+0x6f/0xf0 kernel/time/timer.c:1139
 try_to_grab_pending+0x21f/0x5a0 kernel/workqueue.c:1223
 __cancel_work_timer+0xae/0x440 kernel/workqueue.c:2886
 cancel_delayed_work_sync+0xe/0x10 kernel/workqueue.c:3047
 bond_work_cancel_all drivers/net/bonding/bond_main.c:3245 [inline]
 bond_close+0x14/0x110 drivers/net/bonding/bond_main.c:3308
 __dev_close_many+0x179/0x270 net/core/dev.c:1421
 dev_close_many+0x1de/0x5f0 net/core/dev.c:1451
 rollback_registered_many+0x361/0xcb0 net/core/dev.c:6819
 unregister_netdevice_many+0x3e/0x200 net/core/dev.c:7881
 default_device_exit_batch+0x2f9/0x3d0 net/core/dev.c:8333
 ops_exit_list.isra.4+0xd6/0x120 net/core/net_namespace.c:144
 cleanup_net+0x391/0x7d0 net/core/net_namespace.c:463
 process_one_work+0x72f/0x16a0 kernel/workqueue.c:2096
 worker_thread+0xe1/0x1110 kernel/workqueue.c:2230
 kthread+0x2c9/0x3d0 kernel/kthread.c:229
 ret_from_fork+0x31/0x40 arch/x86/entry/entry_64.S:430
Kernel Offset: disabled
Rebooting in 86400 seconds..