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: 3084 at net/netfilter/core.c:193 nf_unregister_net_hook+0x2d0/0x5a0 net/netfilter/core.c:193
nf_unregister_net_hook: hook not found!
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 3084 Comm: kworker/u4:5 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
 ffff88011ec17890 ffffffff82ed39d2 ffffffff86285b80 ffff88011ec17968
 ffffffff86aef000 ffffffff84ef6230 0000000000000009 ffff88011ec17958
 ffffffff8163dd12 0000000041b58ab3 ffffffff86fab978 ffffffff8163db5c
Call Trace:
 [<ffffffff82ed39d2>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff82ed39d2>] dump_stack+0x136/0x1d4 lib/dump_stack.c:51
 [<ffffffff8163dd12>] panic+0x1b6/0x351 kernel/panic.c:153
 [<ffffffff81349edd>] __warn+0x18d/0x1b0 kernel/panic.c:509
 [<ffffffff81349f92>] warn_slowpath_fmt+0x92/0xb0 kernel/panic.c:532
 [<ffffffff84ef6230>] nf_unregister_net_hook+0x2d0/0x5a0 net/netfilter/core.c:193
 [<ffffffff84ef6626>] nf_unregister_hook_list net/netfilter/core.c:526 [inline]
 [<ffffffff84ef6626>] netfilter_net_exit+0x36/0xa0 net/netfilter/core.c:558
 [<ffffffff84cecf8e>] ops_exit_list.isra.0+0x8e/0x120 net/core/net_namespace.c:136
 [<ffffffff84cef290>] cleanup_net+0x2d0/0x570 net/core/net_namespace.c:449
 [<ffffffff8139b66d>] process_one_work+0x67d/0x14d0 kernel/workqueue.c:2096
 [<ffffffff8139c5a1>] worker_thread+0xe1/0x1050 kernel/workqueue.c:2230
 [<ffffffff813ad14e>] kthread+0x20e/0x2d0 kernel/kthread.c:209
 [<ffffffff8603211a>] ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:432
Kernel Offset: disabled