------------[ cut here ]------------
hook not found, pf 3 num 0
WARNING: CPU: 0 PID: 26 at net/netfilter/core.c:480 __nf_unregister_net_hook+0x8f/0x190 net/netfilter/core.c:480
Modules linked in:
CPU: 0 PID: 26 Comm: kworker/u4:2 Not tainted 5.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Workqueue: netns cleanup_net
RIP: 0010:__nf_unregister_net_hook+0x8f/0x190 net/netfilter/core.c:480
Code: 83 c2 08 39 c1 75 f0 80 3d 9d 7e 96 01 00 75 60 c6 05 94 7e 96 01 01 90 8b 53 1c 89 ee 48 c7 c7 59 9b 66 83 e8 70 af 50 00 90 <0f> 0b 90 90 eb 40 48 c1 e0 04 4c 01 f0 83 fd 05 48 c7 40 08 80 ea
RSP: 0018:ffffc900000dfdc0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff888109b44500 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffffffff839defb8 RDI: ffffffff839defa0
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff838fef20 R11: 3fffffffffffffff R12: ffff88810e378000
R13: ffff88810e378f60 R14: ffff88810f3b6200 R15: ffffffff83c01558
FS:  0000000000000000(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc6ec76a198 CR3: 0000000109bbc000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 nf_unregister_net_hook net/netfilter/core.c:502 [inline]
 nf_unregister_net_hooks+0x61/0x80 net/netfilter/core.c:576
 ops_pre_exit_list net/core/net_namespace.c:165 [inline]
 cleanup_net+0x20b/0x3e0 net/core/net_namespace.c:583
 process_one_work+0x275/0x4d0 kernel/workqueue.c:2275
 worker_thread+0x50/0x3c0 kernel/workqueue.c:2421
 kthread+0x119/0x130 kernel/kthread.c:292
 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:294