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: 2287 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: 1 PID: 2287 Comm: kworker/u4:4 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
 ffff880123c2f890 ffffffff82ed65a2 ffffffff86285b80 ffff880123c2f968
 ffffffff86aebf00 ffffffff84ee1270 0000000000000009 ffff880123c2f958
 ffffffff8163dc22 0000000041b58ab3 ffffffff86fa7be0 ffffffff8163da6c
Call Trace:
 [<ffffffff82ed65a2>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff82ed65a2>] dump_stack+0x136/0x1d4 lib/dump_stack.c:51
 [<ffffffff8163dc22>] 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
 [<ffffffff84ee1270>] nf_unregister_net_hook+0x2d0/0x5a0 net/netfilter/core.c:193
 [<ffffffff84ee1666>] nf_unregister_hook_list net/netfilter/core.c:526 [inline]
 [<ffffffff84ee1666>] netfilter_net_exit+0x36/0xa0 net/netfilter/core.c:558
 [<ffffffff84cd7fce>] ops_exit_list.isra.0+0x8e/0x120 net/core/net_namespace.c:136
 [<ffffffff84cda2d0>] cleanup_net+0x2d0/0x570 net/core/net_namespace.c:449
 [<ffffffff8139b65d>] process_one_work+0x67d/0x14d0 kernel/workqueue.c:2096
 [<ffffffff8139c591>] worker_thread+0xe1/0x1050 kernel/workqueue.c:2230
 [<ffffffff813ad12e>] kthread+0x20e/0x2d0 kernel/kthread.c:209
 [<ffffffff8601e39a>] ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:432
Kernel Offset: disabled