TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. ------------[ cut here ]------------ WARNING: CPU: 0 PID: 1436 at net/core/stream.c:207 sk_stream_kill_queues+0x3c3/0x530 net/core/stream.c:207 Modules linked in: CPU: 0 PID: 1436 Comm: syz-executor068 Not tainted 5.12.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:sk_stream_kill_queues+0x3c3/0x530 net/core/stream.c:207 Code: 00 00 00 fc ff df 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 63 01 00 00 8b ab 20 02 00 00 e9 60 ff ff ff e8 3d 7c 78 fa <0f> 0b eb 97 e8 34 7c 78 fa 0f 0b eb a0 e8 2b 7c 78 fa 0f 0b e9 a5 RSP: 0018:ffffc90000007818 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 00000000fffffe80 RCX: 0000000000000100 RDX: ffff88803f92b880 RSI: ffffffff86fb7a13 RDI: 0000000000000003 RBP: 0000000000000180 R08: 0000000000000000 R09: ffff88803f570b9f R10: ffffffff86fb79aa R11: 000000000000001f R12: ffff88803f570220 R13: ffffffff901f4e20 R14: ffff88803f570028 R15: ffff88804725592d FS: 00007f1ba169c700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000204ff000 CR3: 000000004c322000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: inet_csk_destroy_sock+0x1a5/0x490 net/ipv4/inet_connection_sock.c:889 tcp_done+0x240/0x340 net/ipv4/tcp.c:4418 tcp_rcv_state_process+0x42b1/0x4bb0 net/ipv4/tcp_input.c:6487 tcp_v6_do_rcv+0x7ad/0x12b0 net/ipv6/tcp_ipv6.c:1527 tcp_v6_rcv+0x3004/0x36a0 net/ipv6/tcp_ipv6.c:1735 ip6_protocol_deliver_rcu+0x2e9/0x17f0 net/ipv6/ip6_input.c:422 ip6_input_finish+0x7f/0x160 net/ipv6/ip6_input.c:463 NF_HOOK include/linux/netfilter.h:301 [inline] NF_HOOK include/linux/netfilter.h:295 [inline] ip6_input+0x9c/0xd0 net/ipv6/ip6_input.c:472 dst_input include/net/dst.h:458 [inline] ip6_rcv_finish net/ipv6/ip6_input.c:76 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] NF_HOOK include/linux/netfilter.h:295 [inline] ipv6_rcv+0x28c/0x3c0 net/ipv6/ip6_input.c:297 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5436 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5550 process_backlog+0x232/0x6c0 net/core/dev.c:6413 __napi_poll+0xaf/0x440 net/core/dev.c:6961 napi_poll net/core/dev.c:7028 [inline] net_rx_action+0x801/0xb40 net/core/dev.c:7115 __do_softirq+0x29b/0x9f6 kernel/softirq.c:345 do_softirq.part.0+0xd9/0x130 kernel/softirq.c:248 do_softirq kernel/softirq.c:240 [inline] __local_bh_enable_ip+0x102/0x120 kernel/softirq.c:198 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:745 [inline] ip6_finish_output2+0x755/0x1700 net/ipv6/ip6_output.c:118 __ip6_finish_output net/ipv6/ip6_output.c:182 [inline] __ip6_finish_output+0x4c1/0xe10 net/ipv6/ip6_output.c:161 ip6_finish_output+0x35/0x200 net/ipv6/ip6_output.c:192 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip6_output+0x1e4/0x530 net/ipv6/ip6_output.c:215 dst_output include/net/dst.h:448 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] NF_HOOK include/linux/netfilter.h:295 [inline] ip6_xmit+0x1277/0x1ea0 net/ipv6/ip6_output.c:320 inet6_csk_xmit+0x358/0x630 net/ipv6/inet6_connection_sock.c:135 __tcp_transmit_skb+0x1889/0x38f0 net/ipv4/tcp_output.c:1405 __tcp_send_ack.part.0+0x3d6/0x7a0 net/ipv4/tcp_output.c:3970 __tcp_send_ack net/ipv4/tcp_output.c:3976 [inline] tcp_send_ack+0x7d/0xa0 net/ipv4/tcp_output.c:3976 __tcp_ack_snd_check+0x156/0x9c0 net/ipv4/tcp_input.c:5414 tcp_ack_snd_check net/ipv4/tcp_input.c:5459 [inline] tcp_rcv_established+0x92a/0x1eb0 net/ipv4/tcp_input.c:5884 tcp_v6_do_rcv+0x41d/0x12b0 net/ipv6/tcp_ipv6.c:1502 sk_backlog_rcv include/net/sock.h:1020 [inline] __release_sock+0x134/0x3b0 net/core/sock.c:2550 release_sock+0x54/0x1b0 net/core/sock.c:3074 tcp_recvmsg+0x13f/0x550 net/ipv4/tcp.c:2552 inet6_recvmsg+0x11b/0x5d0 net/ipv6/af_inet6.c:658 sock_recvmsg_nosec net/socket.c:888 [inline] sock_recvmsg net/socket.c:906 [inline] sock_recvmsg net/socket.c:902 [inline] __sys_recvfrom+0x248/0x3a0 net/socket.c:2034 __do_sys_recvfrom net/socket.c:2052 [inline] __se_sys_recvfrom net/socket.c:2048 [inline] __x64_sys_recvfrom+0xdd/0x1b0 net/socket.c:2048 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x452c49 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 21 19 00 00 90 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1ba169c1f8 EFLAGS: 00000212 ORIG_RAX: 000000000000002d RAX: ffffffffffffffda RBX: 00000000004d72b8 RCX: 0000000000452c49 RDX: ffffffffffffff13 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 00000000004d72b0 R08: 0000000020001880 R09: 000000000000001c R10: 0000000000000100 R11: 0000000000000212 R12: 00000000004d72bc R13: 00007ffea54d372f R14: 00007f1ba169c300 R15: 0000000000022000