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: 24 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: 1 PID: 24 Comm: kworker/u4:1 Not tainted 4.9.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net ffff88012b23f750 ffffffff8381b341 1ffffffff11b8802 0000000041b58ab3 ffffffff886f8514 ffffffff8381b184 ffff88012b23f710 0000000000000000 ffff88012b23f770 ffffffff815abfc6 ffff88012b23f720 ffffffff876387f1 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0x1bd/0x29c lib/dump_stack.c:51 [] panic+0x1e5/0x44f kernel/panic.c:179 [] __warn+0x194/0x1d0 kernel/panic.c:542 [] warn_slowpath_fmt+0x92/0xb0 kernel/panic.c:565 [] nf_unregister_net_hook+0x345/0x570 net/netfilter/core.c:151 [] nf_unregister_hook_list net/netfilter/core.c:484 [inline] [] netfilter_net_exit+0x36/0xd0 net/netfilter/core.c:516 [] ops_exit_list+0xae/0x180 net/core/net_namespace.c:136 [] cleanup_net+0x320/0x720 net/core/net_namespace.c:449 [] process_one_work+0x7ab/0x1ae0 kernel/workqueue.c:2096 [] worker_thread+0x60c/0x1450 kernel/workqueue.c:2230 [] kthread+0x23c/0x390 kernel/kthread.c:209 [] ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:433 Kernel Offset: disabled