------------[ cut here ]------------ hook not found, pf 5 num 0 WARNING: net/netfilter/core.c:514 at __nf_unregister_net_hook+0x2c5/0x6f0 net/netfilter/core.c:514, CPU#1: syz.2.265/6891 Modules linked in: CPU: 1 UID: 0 PID: 6891 Comm: syz.2.265 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:__nf_unregister_net_hook+0x2dc/0x6f0 net/netfilter/core.c:514 Code: 24 30 48 8b 5c 24 08 44 8b 6c 24 04 48 8d 3d 1b 62 4a 06 48 8b 44 24 10 0f b6 04 28 84 c0 0f 85 f1 02 00 00 41 8b 17 44 89 ee <67> 48 0f b9 3a e9 db 01 00 00 e8 45 e0 e4 01 89 c3 31 ff 89 c6 e8 RSP: 0018:ffffc9000ca5eb38 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888034565d00 RCX: ffff88805a509e80 RDX: 0000000000000000 RSI: 0000000000000005 RDI: ffffffff8ffe3640 RBP: dffffc0000000000 R08: ffffffff8fef3477 R09: 1ffffffff1fde68e R10: dffffc0000000000 R11: fffffbfff1fde68f R12: ffff888057808000 R13: 0000000000000005 R14: ffff88807e14c490 R15: ffff88802e67873c FS: 00007fd3d32136c0(0000) GS:ffff8881257ed000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000200 CR3: 0000000074ab4000 CR4: 00000000003526f0 Call Trace: nft_unregister_flowtable_ops net/netfilter/nf_tables_api.c:9041 [inline] nft_flowtable_event net/netfilter/nf_tables_api.c:9820 [inline] __nf_tables_flowtable_event+0x5bf/0x8c0 net/netfilter/nf_tables_api.c:9865 nf_tables_flowtable_event+0x103/0x160 net/netfilter/nf_tables_api.c:9896 notifier_call_chain+0x19d/0x3a0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2280 [inline] call_netdevice_notifiers net/core/dev.c:2294 [inline] unregister_netdevice_many_notify+0x186a/0x2370 net/core/dev.c:12398 rtnl_newlink_create+0x84b/0xb70 net/core/rtnetlink.c:3868 __rtnl_newlink net/core/rtnetlink.c:3957 [inline] rtnl_newlink+0x1666/0x1be0 net/core/rtnetlink.c:4072 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xa68/0xad0 net/socket.c:2592 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd3d239aeb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd3d3213028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fd3d2615fa0 RCX: 00007fd3d239aeb9 RDX: 0000000000000000 RSI: 0000200000000200 RDI: 0000000000000003 RBP: 00007fd3d2408c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd3d2616038 R14: 00007fd3d2615fa0 R15: 00007ffd29ee8b38 ---------------- Code disassembly (best guess): 0: 24 30 and $0x30,%al 2: 48 8b 5c 24 08 mov 0x8(%rsp),%rbx 7: 44 8b 6c 24 04 mov 0x4(%rsp),%r13d c: 48 8d 3d 1b 62 4a 06 lea 0x64a621b(%rip),%rdi # 0x64a622e 13: 48 8b 44 24 10 mov 0x10(%rsp),%rax 18: 0f b6 04 28 movzbl (%rax,%rbp,1),%eax 1c: 84 c0 test %al,%al 1e: 0f 85 f1 02 00 00 jne 0x315 24: 41 8b 17 mov (%r15),%edx 27: 44 89 ee mov %r13d,%esi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 db 01 00 00 jmp 0x20f 34: e8 45 e0 e4 01 call 0x1e4e07e 39: 89 c3 mov %eax,%ebx 3b: 31 ff xor %edi,%edi 3d: 89 c6 mov %eax,%esi 3f: e8 .byte 0xe8