TCP: request_sock_TCP: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
==================================================================
BUG: KMSAN: uninit-value in tcp_create_openreq_child+0x157f/0x1cc0 net/ipv4/tcp_minisocks.c:526
CPU: 1 PID: 13310 Comm: syz-executor.0 Not tainted 5.2.0-rc4+ #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x191/0x1f0 lib/dump_stack.c:113
 kmsan_report+0x162/0x2d0 mm/kmsan/kmsan.c:611
 __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:304
 tcp_create_openreq_child+0x157f/0x1cc0 net/ipv4/tcp_minisocks.c:526
 tcp_v4_syn_recv_sock+0x234/0x1cf0 net/ipv4/tcp_ipv4.c:1418
 tcp_v6_syn_recv_sock+0x213/0x2d80 net/ipv6/tcp_ipv6.c:1093
 tcp_get_cookie_sock+0x16e/0x6b0 net/ipv4/syncookies.c:209
 cookie_v4_check+0x34a6/0x3570 net/ipv4/syncookies.c:398
 tcp_v4_cookie_check net/ipv4/tcp_ipv4.c:1507 [inline]
 tcp_v4_do_rcv+0x96b/0xd70 net/ipv4/tcp_ipv4.c:1544
 tcp_v4_rcv+0x51f0/0x6af0 net/ipv4/tcp_ipv4.c:1905
 ip_protocol_deliver_rcu+0x541/0xbc0 net/ipv4/ip_input.c:204
 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ip_local_deliver+0x62a/0x7c0 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:439 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:413 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ip_rcv+0x6c5/0x740 net/ipv4/ip_input.c:523
 __netif_receive_skb_one_core net/core/dev.c:4981 [inline]
 __netif_receive_skb net/core/dev.c:5095 [inline]
 process_backlog+0xef5/0x1410 net/core/dev.c:5906
 napi_poll net/core/dev.c:6329 [inline]
 net_rx_action+0x738/0x1940 net/core/dev.c:6395
 __do_softirq+0x4ad/0x858 kernel/softirq.c:293
 do_softirq_own_stack+0x49/0x80 arch/x86/entry/entry_64.S:1052
 </IRQ>
 do_softirq kernel/softirq.c:338 [inline]
 __local_bh_enable_ip+0x199/0x1e0 kernel/softirq.c:190
 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32
 rcu_read_unlock_bh include/linux/rcupdate.h:682 [inline]
 ip_finish_output2+0x20dc/0x25d0 net/ipv4/ip_output.c:229
 ip_finish_output+0xd2a/0xfd0 net/ipv4/ip_output.c:315
 NF_HOOK_COND include/linux/netfilter.h:294 [inline]
 ip_output+0x541/0x610 net/ipv4/ip_output.c:403
 dst_output include/net/dst.h:433 [inline]
 ip_local_out net/ipv4/ip_output.c:125 [inline]
 __ip_queue_xmit+0x1caf/0x21f0 net/ipv4/ip_output.c:503
 ip_queue_xmit+0xcc/0xf0 include/net/ip.h:198
 __tcp_transmit_skb+0x4076/0x5b40 net/ipv4/tcp_output.c:1156
 tcp_transmit_skb net/ipv4/tcp_output.c:1172 [inline]
 tcp_write_xmit+0x39a9/0xa730 net/ipv4/tcp_output.c:2397
 __tcp_push_pending_frames+0x124/0x4e0 net/ipv4/tcp_output.c:2573
 tcp_send_fin+0xd43/0x1540 net/ipv4/tcp_output.c:3118
 tcp_close+0x16ba/0x1860 net/ipv4/tcp.c:2403
 inet_release+0x1f7/0x270 net/ipv4/af_inet.c:427
 inet6_release+0xaf/0x100 net/ipv6/af_inet6.c:470
 __sock_release net/socket.c:601 [inline]
 sock_close+0x156/0x490 net/socket.c:1273
 __fput+0x4c9/0xba0 fs/file_table.c:280
 ____fput+0x37/0x40 fs/file_table.c:313
 task_work_run+0x22e/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:185 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:168 [inline]
 prepare_exit_to_usermode+0x39d/0x4d0 arch/x86/entry/common.c:199
 syscall_return_slowpath+0x90/0x5c0 arch/x86/entry/common.c:279
 do_syscall_64+0xe2/0xf0 arch/x86/entry/common.c:305
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x4134b1
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:0000000000a6fbc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00000000004134b1
RDX: 0000001b32520000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000001 R08: 000000005a3ade50 R09: 000000005a3ade54
R10: 0000000000a6fca0 R11: 0000000000000293 R12: 000000000075bf20
R13: 000000000004c5e5 R14: 0000000000760828 R15: ffffffffffffffff

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:201 [inline]
 kmsan_internal_poison_shadow+0x53/0xa0 mm/kmsan/kmsan.c:160
 kmsan_kmalloc+0xa4/0x130 mm/kmsan/kmsan_hooks.c:178
 kmem_cache_alloc+0x534/0xb00 mm/slub.c:2781
 reqsk_alloc include/net/request_sock.h:84 [inline]
 inet_reqsk_alloc+0xa8/0x600 net/ipv4/tcp_input.c:6384
 cookie_v4_check+0xd2f/0x3570 net/ipv4/syncookies.c:329
 tcp_v4_cookie_check net/ipv4/tcp_ipv4.c:1507 [inline]
 tcp_v4_do_rcv+0x96b/0xd70 net/ipv4/tcp_ipv4.c:1544
 tcp_v4_rcv+0x51f0/0x6af0 net/ipv4/tcp_ipv4.c:1905
 ip_protocol_deliver_rcu+0x541/0xbc0 net/ipv4/ip_input.c:204
 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ip_local_deliver+0x62a/0x7c0 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:439 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:413 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ip_rcv+0x6c5/0x740 net/ipv4/ip_input.c:523
 __netif_receive_skb_one_core net/core/dev.c:4981 [inline]
 __netif_receive_skb net/core/dev.c:5095 [inline]
 process_backlog+0xef5/0x1410 net/core/dev.c:5906
 napi_poll net/core/dev.c:6329 [inline]
 net_rx_action+0x738/0x1940 net/core/dev.c:6395
 __do_softirq+0x4ad/0x858 kernel/softirq.c:293
 do_softirq_own_stack+0x49/0x80 arch/x86/entry/entry_64.S:1052
 do_softirq kernel/softirq.c:338 [inline]
 __local_bh_enable_ip+0x199/0x1e0 kernel/softirq.c:190
 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32
 rcu_read_unlock_bh include/linux/rcupdate.h:682 [inline]
 ip_finish_output2+0x20dc/0x25d0 net/ipv4/ip_output.c:229
 ip_finish_output+0xd2a/0xfd0 net/ipv4/ip_output.c:315
 NF_HOOK_COND include/linux/netfilter.h:294 [inline]
 ip_output+0x541/0x610 net/ipv4/ip_output.c:403
 dst_output include/net/dst.h:433 [inline]
 ip_local_out net/ipv4/ip_output.c:125 [inline]
 __ip_queue_xmit+0x1caf/0x21f0 net/ipv4/ip_output.c:503
 ip_queue_xmit+0xcc/0xf0 include/net/ip.h:198
 __tcp_transmit_skb+0x4076/0x5b40 net/ipv4/tcp_output.c:1156
 tcp_transmit_skb net/ipv4/tcp_output.c:1172 [inline]
 tcp_write_xmit+0x39a9/0xa730 net/ipv4/tcp_output.c:2397
 __tcp_push_pending_frames+0x124/0x4e0 net/ipv4/tcp_output.c:2573
 tcp_send_fin+0xd43/0x1540 net/ipv4/tcp_output.c:3118
 tcp_close+0x16ba/0x1860 net/ipv4/tcp.c:2403
 inet_release+0x1f7/0x270 net/ipv4/af_inet.c:427
 inet6_release+0xaf/0x100 net/ipv6/af_inet6.c:470
 __sock_release net/socket.c:601 [inline]
 sock_close+0x156/0x490 net/socket.c:1273
 __fput+0x4c9/0xba0 fs/file_table.c:280
 ____fput+0x37/0x40 fs/file_table.c:313
 task_work_run+0x22e/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:185 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:168 [inline]
 prepare_exit_to_usermode+0x39d/0x4d0 arch/x86/entry/common.c:199
 syscall_return_slowpath+0x90/0x5c0 arch/x86/entry/common.c:279
 do_syscall_64+0xe2/0xf0 arch/x86/entry/common.c:305
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
==================================================================