TCP: request_sock_subflow_v4: Possible SYN flooding on port [::]:20002. Sending cookies.
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WARNING: CPU: 0 PID: 5761 at net/mptcp/protocol.c:695 __mptcp_move_skbs_from_subflow+0x1627/0x24d0 net/mptcp/protocol.c:695
Modules linked in:
CPU: 0 UID: 0 PID: 5761 Comm: syz.4.96 Not tainted 6.11.0-syzkaller-02574-ga430d95c5efa #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:__mptcp_move_skbs_from_subflow+0x1627/0x24d0 net/mptcp/protocol.c:695
Code: 02 48 89 ea 83 e2 07 38 d0 7f 08 84 c0 0f 85 86 0d 00 00 c6 43 7f 00 e9 22 f0 ff ff 48 8b ac 24 a0 00 00 00 e8 6a 4f 93 f6 90 <0f> 0b 90 e9 49 f3 ff ff e8 5c 4f 93 f6 90 0f 0b 90 e9 df f0 ff ff
RSP: 0018:ffffc90000007408 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00000000000081e5 RCX: ffffffff8af87c12
RDX: ffff88802e323c00 RSI: ffffffff8af88976 RDI: 0000000000000004
RBP: ffffc90000007528 R08: 0000000000000004 R09: 00000000000081e5
R10: 00000000000055f0 R11: 0000000000000000 R12: ffff88805f08bf68
R13: 0000000000000000 R14: ffff88805f08be80 R15: dffffc0000000000
FS:  00007f939d5c06c0(0000) GS:ffff8880b8800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020100000 CR3: 000000007d5fc000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 move_skbs_to_msk net/mptcp/protocol.c:811 [inline]
 mptcp_data_ready+0x30e/0x8e0 net/mptcp/protocol.c:854
 subflow_data_ready+0x51d/0x7d0 net/mptcp/subflow.c:1490
 tcp_data_ready+0x146/0x5b0 net/ipv4/tcp_input.c:5193
 tcp_data_queue+0x1a6f/0x5280 net/ipv4/tcp_input.c:5283
 tcp_rcv_established+0x8b1/0x21c0 net/ipv4/tcp_input.c:6237
 tcp_v4_do_rcv+0x5ca/0xa90 net/ipv4/tcp_ipv4.c:1915
 tcp_v4_rcv+0x33a8/0x4390 net/ipv4/tcp_ipv4.c:2350
 ip_protocol_deliver_rcu+0xba/0x4c0 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x316/0x570 net/ipv4/ip_input.c:233
 NF_HOOK include/linux/netfilter.h:314 [inline]
 NF_HOOK include/linux/netfilter.h:308 [inline]
 ip_local_deliver+0x18e/0x1f0 net/ipv4/ip_input.c:254
 dst_input include/net/dst.h:460 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:449 [inline]
 NF_HOOK include/linux/netfilter.h:314 [inline]
 NF_HOOK include/linux/netfilter.h:308 [inline]
 ip_rcv+0x2c3/0x5d0 net/ipv4/ip_input.c:569
 __netif_receive_skb_one_core+0x199/0x1e0 net/core/dev.c:5662
 __netif_receive_skb+0x1d/0x160 net/core/dev.c:5775
 process_backlog+0x443/0x15f0 net/core/dev.c:6107
 __napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:6771
 napi_poll net/core/dev.c:6840 [inline]
 net_rx_action+0xa92/0x1010 net/core/dev.c:6962
 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554
 do_softirq kernel/softirq.c:455 [inline]
 do_softirq+0xb2/0xf0 kernel/softirq.c:442
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x100/0x120 kernel/softirq.c:382
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:908 [inline]
 __dev_queue_xmit+0x887/0x4300 net/core/dev.c:4451
 dev_queue_xmit include/linux/netdevice.h:3094 [inline]
 neigh_hh_output include/net/neighbour.h:526 [inline]
 neigh_output include/net/neighbour.h:540 [inline]
 ip_finish_output2+0x16fe/0x25e0 net/ipv4/ip_output.c:236
 __ip_finish_output net/ipv4/ip_output.c:314 [inline]
 __ip_finish_output+0x49e/0x950 net/ipv4/ip_output.c:296
 ip_finish_output+0x31/0x310 net/ipv4/ip_output.c:324
 NF_HOOK_COND include/linux/netfilter.h:303 [inline]
 ip_output+0x13b/0x2a0 net/ipv4/ip_output.c:434
 dst_output include/net/dst.h:450 [inline]
 ip_local_out+0x33e/0x4a0 net/ipv4/ip_output.c:130
 __ip_queue_xmit+0x747/0x1940 net/ipv4/ip_output.c:536
 __tcp_transmit_skb+0x2a4c/0x3dc0 net/ipv4/tcp_output.c:1466
 tcp_transmit_skb net/ipv4/tcp_output.c:1484 [inline]
 tcp_mtu_probe net/ipv4/tcp_output.c:2547 [inline]
 tcp_write_xmit+0x8338/0x8720 net/ipv4/tcp_output.c:2752
 __tcp_push_pending_frames+0xaf/0x390 net/ipv4/tcp_output.c:3015
 tcp_push_pending_frames include/net/tcp.h:2107 [inline]
 tcp_data_snd_check net/ipv4/tcp_input.c:5714 [inline]
 tcp_rcv_established+0x93a/0x21c0 net/ipv4/tcp_input.c:6239
 tcp_v4_do_rcv+0x5ca/0xa90 net/ipv4/tcp_ipv4.c:1915
 sk_backlog_rcv include/net/sock.h:1113 [inline]
 __release_sock+0x31b/0x400 net/core/sock.c:3072
 release_sock+0x5a/0x220 net/core/sock.c:3626
 __mptcp_push_pending+0x400/0x560 net/mptcp/protocol.c:1625
 mptcp_sendmsg+0x1960/0x1f20 net/mptcp/protocol.c:1910
 inet_sendmsg+0x119/0x140 net/ipv4/af_inet.c:853
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 __sys_sendto+0x426/0x4d0 net/socket.c:2210
 __do_sys_sendto net/socket.c:2222 [inline]
 __se_sys_sendto net/socket.c:2218 [inline]
 __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2218
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f939c77def9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f939d5c0038 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f939c935f80 RCX: 00007f939c77def9
RDX: 0000000000100b20 RSI: 0000000020000040 RDI: 0000000000000004
RBP: 00007f939c7f0b76 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f939c935f80 R15: 00007ffc8c887c18
 </TASK>