TCP: request_sock_subflow_v4: Possible SYN flooding on port [::]:20002. Sending cookies.
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WARNING: CPU: 0 PID: 6622 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: 6622 Comm: syz.3.440 Not tainted 6.11.0-syzkaller-11558-g075dbe9f6e3c #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
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 ca bb 8c f6 90 <0f> 0b 90 e9 49 f3 ff ff e8 bc bb 8c f6 90 0f 0b 90 e9 df f0 ff ff
RSP: 0018:ffffc90000007408 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00000000000081e5 RCX: ffffffff8b002892
RDX: ffff888027760000 RSI: ffffffff8b0035f6 RDI: 0000000000000004
RBP: ffffc90000007528 R08: 0000000000000004 R09: 00000000000081e5
R10: 00000000000055f0 R11: 0000000000000000 R12: ffff888048e32668
R13: 0000000000000001 R14: ffff888048e32580 R15: dffffc0000000000
FS:  00007fc483e8e6c0(0000) GS:ffff88806a600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200e2000 CR3: 0000000048ab2000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000e DR6: 00000000ffff0ff0 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+0x213/0x8f0 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
 mptcp_check_send_data_fin+0x24a/0x450 net/mptcp/protocol.c:2992
 __mptcp_close+0x928/0xbf0 net/mptcp/protocol.c:3088
 mptcp_close+0x28/0xe0 net/mptcp/protocol.c:3143
 inet_release+0x13c/0x280 net/ipv4/af_inet.c:437
 inet6_release+0x4f/0x70 net/ipv6/af_inet6.c:489
 __sock_release+0xb0/0x270 net/socket.c:659
 sock_close+0x1c/0x30 net/socket.c:1427
 __fput+0x3f6/0xb60 fs/file_table.c:431
 task_work_run+0x14e/0x250 kernel/task_work.c:228
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc48317df39
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:00007fc483e8e038 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fc483335f80 RCX: 00007fc48317df39
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000003
RBP: 00007fc4831f0216 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fc483335f80 R15: 00007ffddda57568
 </TASK>