TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
=====================================================
BUG: KMSAN: uninit-value in tcp_in_window net/netfilter/nf_conntrack_proto_tcp.c:607 [inline]
BUG: KMSAN: uninit-value in nf_conntrack_tcp_packet+0x4ff0/0x9190 net/netfilter/nf_conntrack_proto_tcp.c:1119
 tcp_in_window net/netfilter/nf_conntrack_proto_tcp.c:607 [inline]
 nf_conntrack_tcp_packet+0x4ff0/0x9190 net/netfilter/nf_conntrack_proto_tcp.c:1119
 nf_conntrack_handle_packet net/netfilter/nf_conntrack_core.c:1827 [inline]
 nf_conntrack_in+0xaeb/0x2ef0 net/netfilter/nf_conntrack_core.c:1918
 ipv6_conntrack_local+0x68/0x80 net/netfilter/nf_conntrack_proto.c:414
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0x18c/0x490 net/netfilter/core.c:619
 nf_hook include/linux/netfilter.h:262 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ip6_xmit+0x2790/0x2860 net/ipv6/ip6_output.c:324
 tcp_v6_send_synack+0x13b6/0x1500 net/ipv6/tcp_ipv6.c:561
 tcp_conn_request+0x2f19/0x4cb0 net/ipv4/tcp_input.c:6945
 tcp_v6_conn_request+0x406/0x550 net/ipv6/tcp_ipv6.c:1215
 tcp_rcv_state_process+0x2c5/0x3290 net/ipv4/tcp_input.c:6406
 tcp_v6_do_rcv+0x1487/0x2030 net/ipv6/tcp_ipv6.c:1546
 tcp_v6_rcv+0x44d6/0x4dc0 net/ipv6/tcp_ipv6.c:1754
 ip6_protocol_deliver_rcu+0xeb3/0x2ad0 net/ipv6/ip6_input.c:422
 ip6_input_finish net/ipv6/ip6_input.c:463 [inline]
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ip6_input+0x130/0x390 net/ipv6/ip6_input.c:472
 dst_input include/net/dst.h:460 [inline]
 ip6_rcv_finish+0x5fa/0x7f0 net/ipv6/ip6_input.c:76
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ipv6_rcv+0x1d1/0x460 net/ipv6/ip6_input.c:297
 __netif_receive_skb_one_core net/core/dev.c:5462 [inline]
 __netif_receive_skb+0x1ec/0x630 net/core/dev.c:5576
 process_backlog+0x562/0xc30 net/core/dev.c:6452
 __napi_poll+0x14e/0xbc0 net/core/dev.c:7020
 napi_poll net/core/dev.c:7087 [inline]
 net_rx_action+0x824/0x1880 net/core/dev.c:7174
 __do_softirq+0x1fe/0x7eb kernel/softirq.c:558
 do_softirq+0x16d/0x220 kernel/softirq.c:459
 __local_bh_enable_ip+0xd5/0xe0 kernel/softirq.c:383
 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:33
 rcu_read_unlock_bh include/linux/rcupdate.h:758 [inline]
 ip6_finish_output2+0x24e6/0x2c50 net/ipv6/ip6_output.c:127
 __ip6_finish_output+0xf46/0x10a0 net/ipv6/ip6_output.c:191
 ip6_finish_output+0x15c/0x4d0 net/ipv6/ip6_output.c:201
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip6_output+0x4ac/0x7f0 net/ipv6/ip6_output.c:224
 dst_output include/net/dst.h:450 [inline]
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ip6_xmit+0x20b4/0x2860 net/ipv6/ip6_output.c:324
 inet6_csk_xmit+0x57e/0x710 net/ipv6/inet6_connection_sock.c:135
 __tcp_transmit_skb+0x4ae9/0x5cf0 net/ipv4/tcp_output.c:1402
 tcp_transmit_skb net/ipv4/tcp_output.c:1420 [inline]
 tcp_send_syn_data net/ipv4/tcp_output.c:3798 [inline]
 tcp_connect+0x301c/0x3cb0 net/ipv4/tcp_output.c:3837
 tcp_v6_connect+0x28cf/0x2a90 net/ipv6/tcp_ipv6.c:334
 __inet_stream_connect+0x44f/0x1810 net/ipv4/af_inet.c:660
 tcp_sendmsg_fastopen+0x897/0xc20 net/ipv4/tcp.c:1162
 tcp_sendmsg_locked+0x722/0x6d90 net/ipv4/tcp.c:1204
 tcp_sendmsg+0xb2/0x100 net/ipv4/tcp.c:1440
 inet6_sendmsg+0x15b/0x1d0 net/ipv6/af_inet6.c:644
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg net/socket.c:724 [inline]
 __sys_sendto+0x7c7/0x9c0 net/socket.c:2036
 __do_sys_sendto net/socket.c:2048 [inline]
 __se_sys_sendto net/socket.c:2044 [inline]
 __ia32_sys_sendto+0x1a4/0x220 net/socket.c:2044
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Uninit was stored to memory at:
 tcp_in_window net/netfilter/nf_conntrack_proto_tcp.c:507 [inline]
 nf_conntrack_tcp_packet+0x4659/0x9190 net/netfilter/nf_conntrack_proto_tcp.c:1119
 nf_conntrack_handle_packet net/netfilter/nf_conntrack_core.c:1827 [inline]
 nf_conntrack_in+0xaeb/0x2ef0 net/netfilter/nf_conntrack_core.c:1918
 ipv6_conntrack_local+0x68/0x80 net/netfilter/nf_conntrack_proto.c:414
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0x18c/0x490 net/netfilter/core.c:619
 nf_hook include/linux/netfilter.h:262 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ip6_xmit+0x2790/0x2860 net/ipv6/ip6_output.c:324
 tcp_v6_send_synack+0x13b6/0x1500 net/ipv6/tcp_ipv6.c:561
 tcp_conn_request+0x2f19/0x4cb0 net/ipv4/tcp_input.c:6945
 tcp_v6_conn_request+0x406/0x550 net/ipv6/tcp_ipv6.c:1215
 tcp_rcv_state_process+0x2c5/0x3290 net/ipv4/tcp_input.c:6406
 tcp_v6_do_rcv+0x1487/0x2030 net/ipv6/tcp_ipv6.c:1546
 tcp_v6_rcv+0x44d6/0x4dc0 net/ipv6/tcp_ipv6.c:1754
 ip6_protocol_deliver_rcu+0xeb3/0x2ad0 net/ipv6/ip6_input.c:422
 ip6_input_finish net/ipv6/ip6_input.c:463 [inline]
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ip6_input+0x130/0x390 net/ipv6/ip6_input.c:472
 dst_input include/net/dst.h:460 [inline]
 ip6_rcv_finish+0x5fa/0x7f0 net/ipv6/ip6_input.c:76
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ipv6_rcv+0x1d1/0x460 net/ipv6/ip6_input.c:297
 __netif_receive_skb_one_core net/core/dev.c:5462 [inline]
 __netif_receive_skb+0x1ec/0x630 net/core/dev.c:5576
 process_backlog+0x562/0xc30 net/core/dev.c:6452
 __napi_poll+0x14e/0xbc0 net/core/dev.c:7020
 napi_poll net/core/dev.c:7087 [inline]
 net_rx_action+0x824/0x1880 net/core/dev.c:7174
 __do_softirq+0x1fe/0x7eb kernel/softirq.c:558

Uninit was stored to memory at:
 tcp_make_synack+0x1832/0x1c00 net/ipv4/tcp_output.c:3576
 tcp_v6_send_synack+0x259/0x1500 net/ipv6/tcp_ipv6.c:538
 tcp_conn_request+0x2f19/0x4cb0 net/ipv4/tcp_input.c:6945
 tcp_v6_conn_request+0x406/0x550 net/ipv6/tcp_ipv6.c:1215
 tcp_rcv_state_process+0x2c5/0x3290 net/ipv4/tcp_input.c:6406
 tcp_v6_do_rcv+0x1487/0x2030 net/ipv6/tcp_ipv6.c:1546
 tcp_v6_rcv+0x44d6/0x4dc0 net/ipv6/tcp_ipv6.c:1754
 ip6_protocol_deliver_rcu+0xeb3/0x2ad0 net/ipv6/ip6_input.c:422
 ip6_input_finish net/ipv6/ip6_input.c:463 [inline]
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ip6_input+0x130/0x390 net/ipv6/ip6_input.c:472
 dst_input include/net/dst.h:460 [inline]
 ip6_rcv_finish+0x5fa/0x7f0 net/ipv6/ip6_input.c:76
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ipv6_rcv+0x1d1/0x460 net/ipv6/ip6_input.c:297
 __netif_receive_skb_one_core net/core/dev.c:5462 [inline]
 __netif_receive_skb+0x1ec/0x630 net/core/dev.c:5576
 process_backlog+0x562/0xc30 net/core/dev.c:6452
 __napi_poll+0x14e/0xbc0 net/core/dev.c:7020
 napi_poll net/core/dev.c:7087 [inline]
 net_rx_action+0x824/0x1880 net/core/dev.c:7174
 __do_softirq+0x1fe/0x7eb kernel/softirq.c:558

Uninit was stored to memory at:
 tcp_conn_request+0x3ab5/0x4cb0 net/ipv4/tcp_input.c:6918
 tcp_v6_conn_request+0x406/0x550 net/ipv6/tcp_ipv6.c:1215
 tcp_rcv_state_process+0x2c5/0x3290 net/ipv4/tcp_input.c:6406
 tcp_v6_do_rcv+0x1487/0x2030 net/ipv6/tcp_ipv6.c:1546
 tcp_v6_rcv+0x44d6/0x4dc0 net/ipv6/tcp_ipv6.c:1754
 ip6_protocol_deliver_rcu+0xeb3/0x2ad0 net/ipv6/ip6_input.c:422
 ip6_input_finish net/ipv6/ip6_input.c:463 [inline]
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ip6_input+0x130/0x390 net/ipv6/ip6_input.c:472
 dst_input include/net/dst.h:460 [inline]
 ip6_rcv_finish+0x5fa/0x7f0 net/ipv6/ip6_input.c:76
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ipv6_rcv+0x1d1/0x460 net/ipv6/ip6_input.c:297
 __netif_receive_skb_one_core net/core/dev.c:5462 [inline]
 __netif_receive_skb+0x1ec/0x630 net/core/dev.c:5576
 process_backlog+0x562/0xc30 net/core/dev.c:6452
 __napi_poll+0x14e/0xbc0 net/core/dev.c:7020
 napi_poll net/core/dev.c:7087 [inline]
 net_rx_action+0x824/0x1880 net/core/dev.c:7174
 __do_softirq+0x1fe/0x7eb kernel/softirq.c:558

Local variable combined.i12 created at:
 cookie_hash net/ipv6/syncookies.c:50 [inline]
 secure_tcp_syn_cookie+0x1f0/0x590 net/ipv6/syncookies.c:71
 __cookie_v6_init_sequence net/ipv6/syncookies.c:104 [inline]
 cookie_v6_init_sequence+0x411/0x470 net/ipv6/syncookies.c:114

CPU: 0 PID: 14233 Comm: syz-executor.0 Not tainted 5.16.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================