team0 (unregistering): Port device team_slave_0 removed
bond0 (unregistering): Releasing backup interface bond_slave_1
bond0 (unregistering): Releasing backup interface bond_slave_0
bond0 (unregistering): Released all slaves
------------[ cut here ]------------
WARNING: CPU: 1 PID: 10552 at net/netfilter/core.c:193 nf_unregister_net_hook+0x3b4/0x850 net/netfilter/core.c:193
nf_unregister_net_hook: hook not found!
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 10552 Comm: kworker/u4:0 Not tainted 4.8.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
 ffff88010098f748 ffffffff837a86e1 1ffffffff117876a 0000000041b58ab3
 ffffffff884f1024 ffffffff837a8524 ffff88010098f708 0000000000000000
 00000000000005db 00000000000005db 0000000000000037 ffff88010098f780
Call Trace:
 [<ffffffff837a86e1>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff837a86e1>] dump_stack+0x1bd/0x29c lib/dump_stack.c:51
 [<ffffffff817f6596>] panic+0x1e5/0x448 kernel/panic.c:153
 [<ffffffff814140d4>] __warn+0x194/0x1d0 kernel/panic.c:509
 [<ffffffff814141a2>] warn_slowpath_fmt+0x92/0xb0 kernel/panic.c:532
 [<ffffffff85fcf0a4>] nf_unregister_net_hook+0x3b4/0x850 net/netfilter/core.c:193
 [<ffffffff85fcf7c6>] nf_unregister_hook_list net/netfilter/core.c:526 [inline]
 [<ffffffff85fcf7c6>] netfilter_net_exit+0x36/0xd0 net/netfilter/core.c:558
 [<ffffffff85d328ae>] ops_exit_list+0xae/0x180 net/core/net_namespace.c:136
 [<ffffffff85d36680>] cleanup_net+0x320/0x720 net/core/net_namespace.c:449
 [<ffffffff8147d85b>] process_one_work+0x7ab/0x1ae0 kernel/workqueue.c:2096
 [<ffffffff8147f19c>] worker_thread+0x60c/0x1450 kernel/workqueue.c:2230
 [<ffffffff814958ac>] kthread+0x23c/0x390 kernel/kthread.c:209
 [<ffffffff875c145a>] ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:432
Kernel Offset: disabled