bond0 (unregistering): Released all slaves
audit: type=1400 audit(1596298644.208:11): avc:  denied  { execmem } for  pid=16839 comm="syz-executor957" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
------------[ cut here ]------------
WARNING: CPU: 0 PID: 504 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: 0 PID: 504 Comm: kworker/u4:3 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
 ffff88012a3a7890 ffffffff82d76a92 ffffffff86085f80 ffff88012a3a7968
 ffffffff868b2800 ffffffff84d73d0a 0000000000000009 ffff88012a3a7958
 ffffffff81641ef2 0000000041b58ab3 ffffffff86d67a6f ffffffff81641d3c
Call Trace:
 [<ffffffff82d76a92>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff82d76a92>] dump_stack+0x136/0x1d4 lib/dump_stack.c:51
 [<ffffffff81641ef2>] panic+0x1b6/0x358 kernel/panic.c:179
 [<ffffffff81349a1d>] __warn+0x18d/0x1b0 kernel/panic.c:542
 [<ffffffff81349ad2>] warn_slowpath_fmt+0x92/0xb0 kernel/panic.c:565
 [<ffffffff84d73d0a>] nf_unregister_net_hook+0x28a/0x3c0 net/netfilter/core.c:151
 [<ffffffff84d74106>] nf_unregister_hook_list net/netfilter/core.c:484 [inline]
 [<ffffffff84d74106>] netfilter_net_exit+0x36/0xa0 net/netfilter/core.c:516
 [<ffffffff84b6af8e>] ops_exit_list.isra.0+0x8e/0x120 net/core/net_namespace.c:136
 [<ffffffff84b6d290>] cleanup_net+0x2d0/0x570 net/core/net_namespace.c:449
 [<ffffffff8139b10d>] process_one_work+0x67d/0x14d0 kernel/workqueue.c:2096
 [<ffffffff8139c041>] worker_thread+0xe1/0x1050 kernel/workqueue.c:2230
 [<ffffffff813acc4e>] kthread+0x20e/0x2d0 kernel/kthread.c:209
 [<ffffffff85eb7fda>] ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:433
Kernel Offset: disabled