------------[ cut here ]------------
hook not found, pf 3 num 0
WARNING: CPU: 0 PID: 96 at net/netfilter/core.c:480 __nf_unregister_net_hook+0x4ee/0x640 net/netfilter/core.c:480
Modules linked in:
CPU: 0 PID: 96 Comm: kworker/u4:3 Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:__nf_unregister_net_hook+0x4ee/0x640 net/netfilter/core.c:480
Code: c6 05 e1 c7 02 06 01 43 8a 04 2e 84 c0 0f 85 3a 01 00 00 48 8b 04 24 8b 10 48 c7 c7 00 b5 59 8b 44 89 e6 31 c0 e8 b2 2e 29 f9 <0f> 0b e9 08 ff ff ff 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 0f 8c 3d
RSP: 0018:ffffc900011cfad8 EFLAGS: 00010246
RAX: bbe48b6059b57d00 RBX: ffff88802facb800 RCX: ffff888015da8000
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffff88803c920f20 R08: ffffffff81653d92 R09: ffffed1017343f24
R10: ffffed1017343f24 R11: 0000000000000000 R12: 0000000000000003
R13: dffffc0000000000 R14: 1ffff11028eeac63 R15: ffff88803c920000
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe1e5e1e000 CR3: 00000000141c8000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 nf_unregister_net_hook net/netfilter/core.c:498 [inline]
 nf_unregister_net_hooks+0xe7/0x150 net/netfilter/core.c:576
 ops_pre_exit_list net/core/net_namespace.c:165 [inline]
 cleanup_net+0x608/0xc60 net/core/net_namespace.c:583
 process_one_work+0x833/0x10c0 kernel/workqueue.c:2275
 worker_thread+0xac1/0x1300 kernel/workqueue.c:2421
 kthread+0x39a/0x3c0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294