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: 28 at net/netfilter/core.c:151 nf_unregister_net_hook+0x28a/0x3c0 net/netfilter/core.c:151 nf_unregister_net_hook: hook not found! Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 28 Comm: kworker/u4:2 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 ffff88012b30f890 ffffffff82d76a92 ffffffff86085f80 ffff88012b30f968 ffffffff868b2400 ffffffff84d73d0a 0000000000000009 ffff88012b30f958 ffffffff81641ef2 0000000041b58ab3 ffffffff86d6766f ffffffff81641d3c Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0x136/0x1d4 lib/dump_stack.c:51 [] panic+0x1b6/0x358 kernel/panic.c:179 [] __warn+0x18d/0x1b0 kernel/panic.c:542 [] warn_slowpath_fmt+0x92/0xb0 kernel/panic.c:565 [] nf_unregister_net_hook+0x28a/0x3c0 net/netfilter/core.c:151 [] nf_unregister_hook_list net/netfilter/core.c:484 [inline] [] netfilter_net_exit+0x36/0xa0 net/netfilter/core.c:516 [] ops_exit_list.isra.0+0x8e/0x120 net/core/net_namespace.c:136 [] cleanup_net+0x2d0/0x570 net/core/net_namespace.c:449 [] process_one_work+0x67d/0x14d0 kernel/workqueue.c:2096 [] worker_thread+0xe1/0x1050 kernel/workqueue.c:2230 [] kthread+0x20e/0x2d0 kernel/kthread.c:209 [] ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:433 Kernel Offset: disabled