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: 0 PID: 6 at net/netfilter/core.c:151 nf_unregister_net_hook+0x345/0x570 net/netfilter/core.c:151
nf_unregister_net_hook: hook not found!
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 6 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
 ffff88012b097750 ffffffff8379f2a1 1ffffffff11787e2 0000000041b58ab3
 ffffffff884f38ec ffffffff8379f0e4 ffff88012b097710 0000000000000000
 ffff88012b097770 ffffffff815aa576 ffff88012b097720 ffffffff875cdd21
Call Trace:
 [<ffffffff8379f2a1>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff8379f2a1>] dump_stack+0x1bd/0x29c lib/dump_stack.c:51
 [<ffffffff817f4e86>] panic+0x1e5/0x448 kernel/panic.c:153
 [<ffffffff81413964>] __warn+0x194/0x1d0 kernel/panic.c:509
 [<ffffffff81413a32>] warn_slowpath_fmt+0x92/0xb0 kernel/panic.c:532
 [<ffffffff85fd4975>] nf_unregister_net_hook+0x345/0x570 net/netfilter/core.c:151
 [<ffffffff85fd5106>] nf_unregister_hook_list net/netfilter/core.c:484 [inline]
 [<ffffffff85fd5106>] netfilter_net_exit+0x36/0xd0 net/netfilter/core.c:516
 [<ffffffff85d388ee>] ops_exit_list+0xae/0x180 net/core/net_namespace.c:136
 [<ffffffff85d3c6c0>] cleanup_net+0x320/0x720 net/core/net_namespace.c:449
 [<ffffffff8147cf8b>] process_one_work+0x7ab/0x1ae0 kernel/workqueue.c:2096
 [<ffffffff8147e8cc>] worker_thread+0x60c/0x1450 kernel/workqueue.c:2230
 [<ffffffff81494fec>] kthread+0x23c/0x390 kernel/kthread.c:209
 [<ffffffff875cec9a>] ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:432
Kernel Offset: disabled