TCP: request_sock_subflow_v4: Possible SYN flooding on port [::]:20002. Sending cookies.
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WARNING: CPU: 1 PID: 9809 at net/mptcp/protocol.c:693 __mptcp_move_skbs_from_subflow+0x2045/0x2190 net/mptcp/protocol.c:693
Modules linked in:
CPU: 1 UID: 0 PID: 9809 Comm: syz.0.1123 Not tainted 6.10.0-next-20240719-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:__mptcp_move_skbs_from_subflow+0x2045/0x2190 net/mptcp/protocol.c:693
Code: 0f b6 dc 31 ff 89 de e8 f9 f7 16 f6 89 d8 48 81 c4 50 01 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 dc f4 16 f6 90 <0f> 0b 90 e9 47 ff ff ff e8 ce f4 16 f6 90 0f 0b 90 e9 fd e0 ff ff
RSP: 0018:ffffc90000a17db8 EFLAGS: 00010246
RAX: ffffffff8b7ce434 RBX: 00000000000055f0 RCX: ffff888018788000
RDX: 0000000080000303 RSI: 00000000000081e5 RDI: 00000000000055f0
RBP: 1ffff1100f46594e R08: ffffffff8b7cd438 R09: 1ffff1100f465958
R10: dffffc0000000000 R11: ffffed100f465959 R12: 0000000000000000
R13: dffffc0000000000 R14: 00000000c9ca4e88 R15: 00000000000081e5
FS:  00007fac2ddc76c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020100000 CR3: 000000006461a000 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:809 [inline]
 mptcp_data_ready+0x2de/0xa50 net/mptcp/protocol.c:854
 subflow_data_ready+0x34a/0x920 net/mptcp/subflow.c:1465
 tcp_data_queue+0x20fd/0x76c0 net/ipv4/tcp_input.c:5278
 tcp_rcv_established+0xfba/0x2020 net/ipv4/tcp_input.c:6225
 tcp_v4_do_rcv+0x96d/0xc70 net/ipv4/tcp_ipv4.c:1909
 tcp_v4_rcv+0x2dc0/0x37f0 net/ipv4/tcp_ipv4.c:2344
 ip_protocol_deliver_rcu+0x22e/0x440 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x341/0x5f0 net/ipv4/ip_input.c:233
 NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314
 NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314
 __netif_receive_skb_one_core net/core/dev.c:5660 [inline]
 __netif_receive_skb+0x2bf/0x650 net/core/dev.c:5774
 process_backlog+0x662/0x15b0 net/core/dev.c:6107
 __napi_poll+0xcb/0x490 net/core/dev.c:6771
 napi_poll net/core/dev.c:6840 [inline]
 net_rx_action+0x89b/0x1240 net/core/dev.c:6962
 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
 do_softirq+0x11b/0x1e0 kernel/softirq.c:455
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x1bb/0x200 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+0x1763/0x3e90 net/core/dev.c:4450
 dev_queue_xmit include/linux/netdevice.h:3105 [inline]
 neigh_hh_output include/net/neighbour.h:526 [inline]
 neigh_output include/net/neighbour.h:540 [inline]
 ip_finish_output2+0xd41/0x1390 net/ipv4/ip_output.c:235
 ip_local_out net/ipv4/ip_output.c:129 [inline]
 __ip_queue_xmit+0x118c/0x1b80 net/ipv4/ip_output.c:535
 __tcp_transmit_skb+0x2544/0x3b30 net/ipv4/tcp_output.c:1466
 tcp_transmit_skb net/ipv4/tcp_output.c:1484 [inline]
 tcp_mtu_probe net/ipv4/tcp_output.c:2546 [inline]
 tcp_write_xmit+0x6249/0x6a10 net/ipv4/tcp_output.c:2751
 __tcp_push_pending_frames+0x9b/0x360 net/ipv4/tcp_output.c:3014
 tcp_push_pending_frames include/net/tcp.h:2106 [inline]
 tcp_data_snd_check net/ipv4/tcp_input.c:5702 [inline]
 tcp_rcv_established+0x1026/0x2020 net/ipv4/tcp_input.c:6227
 tcp_v4_do_rcv+0x96d/0xc70 net/ipv4/tcp_ipv4.c:1909
 sk_backlog_rcv include/net/sock.h:1111 [inline]
 __release_sock+0x214/0x350 net/core/sock.c:3004
 release_sock+0x61/0x1f0 net/core/sock.c:3558
 mptcp_push_release net/mptcp/protocol.c:1484 [inline]
 __mptcp_push_pending+0x6b5/0x9f0 net/mptcp/protocol.c:1623
 mptcp_sendmsg+0x1738/0x1b10 net/mptcp/protocol.c:1908
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x1a6/0x270 net/socket.c:745
 __sys_sendto+0x3a4/0x4f0 net/socket.c:2204
 __do_sys_sendto net/socket.c:2216 [inline]
 __se_sys_sendto net/socket.c:2212 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2212
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fac2cf75f19
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:00007fac2ddc7048 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fac2d105f60 RCX: 00007fac2cf75f19
RDX: 0000000000100b20 RSI: 0000000020000040 RDI: 0000000000000004
RBP: 00007fac2cfe4e68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000004d R14: 00007fac2d105f60 R15: 00007ffe00b96e48
 </TASK>