TCP: request_sock_TCP: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
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BUG: KMSAN: uninit-value in add32_with_carry arch/x86/include/asm/checksum_64.h:185 [inline]
BUG: KMSAN: uninit-value in do_csum arch/x86/lib/csum-partial_64.c:114 [inline]
BUG: KMSAN: uninit-value in csum_partial+0x78e/0x850 arch/x86/lib/csum-partial_64.c:136
CPU: 1 PID: 6072 Comm: syz-executor0 Not tainted 4.16.0+ #84
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 add32_with_carry arch/x86/include/asm/checksum_64.h:185 [inline]
 do_csum arch/x86/lib/csum-partial_64.c:114 [inline]
 csum_partial+0x78e/0x850 arch/x86/lib/csum-partial_64.c:136
 csum_partial_ext+0x89/0xa0 include/net/checksum.h:118
 __skb_checksum+0x6d4/0x1010 net/core/skbuff.c:2498
 skb_checksum+0xec/0x120 net/core/skbuff.c:2545
 __skb_checksum_complete+0x90/0x400 net/core/datagram.c:752
 __udp_lib_checksum_complete include/net/udp.h:115 [inline]
 udp_recvmsg+0x6a3/0x1d90 net/ipv4/udp.c:1602
 inet_recvmsg+0x4c2/0x5f0 net/ipv4/af_inet.c:796
 sock_recvmsg_nosec net/socket.c:803 [inline]
 sock_recvmsg+0x1d0/0x230 net/socket.c:810
 ___sys_recvmsg+0x3fb/0x810 net/socket.c:2205
 __sys_recvmmsg+0x54e/0xdb0 net/socket.c:2313
 SYSC_recvmmsg+0x29b/0x3e0 net/socket.c:2394
 SyS_recvmmsg+0x76/0xa0 net/socket.c:2378
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x455329
RSP: 002b:00007f6a89470c68 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f6a894716d4 RCX: 0000000000455329
RDX: 0000000000000001 RSI: 00000000208db000 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000020746ff0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000495 R14: 00000000006f9e98 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_alloc_meta_for_pages+0x161/0x3a0 mm/kmsan/kmsan.c:814
 kmsan_alloc_page+0x82/0xe0 mm/kmsan/kmsan.c:868
 __alloc_pages_nodemask+0xf5b/0x5dc0 mm/page_alloc.c:4283
 alloc_pages_current+0x6b5/0x970 mm/mempolicy.c:2055
 alloc_pages include/linux/gfp.h:494 [inline]
 skb_page_frag_refill+0x3ba/0x5e0 net/core/sock.c:2208
 sk_page_frag_refill+0xa4/0x340 net/core/sock.c:2228
 __ip_append_data+0x107e/0x3d10 net/ipv4/ip_output.c:1057
 ip_append_data+0x2fb/0x440 net/ipv4/ip_output.c:1170
 udp_sendmsg+0x746/0x3180 net/ipv4/udp.c:1070
 inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg net/socket.c:640 [inline]
 SYSC_sendto+0x6c3/0x7e0 net/socket.c:1747
 SyS_sendto+0x8a/0xb0 net/socket.c:1715
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
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