==================================================================
BUG: KCSAN: data-race in __inet_hash_connect / inet_send_prepare

read to 0xffff8880a9bf0a8e of 2 bytes by task 15290 on cpu 1:
 inet_send_prepare+0x4a/0x200 net/ipv4/af_inet.c:792
 inet6_sendmsg+0x37/0x90 net/ipv6/af_inet6.c:573
 sock_sendmsg_nosec net/socket.c:637 [inline]
 sock_sendmsg+0x9f/0xc0 net/socket.c:657
 ___sys_sendmsg+0x59d/0x5d0 net/socket.c:2311
 __sys_sendmsg+0xa0/0x160 net/socket.c:2356
 __do_sys_sendmsg net/socket.c:2365 [inline]
 __se_sys_sendmsg net/socket.c:2363 [inline]
 __x64_sys_sendmsg+0x51/0x70 net/socket.c:2363
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff8880a9bf0a8e of 2 bytes by task 15289 on cpu 0:
 inet_bind_hash net/ipv4/inet_hashtables.c:95 [inline]
 __inet_hash_connect+0x3ae/0x870 net/ipv4/inet_hashtables.c:718
 inet6_hash_connect+0x5a/0xa0 net/ipv6/inet6_hashtables.c:281
 tcp_v6_connect+0xbb4/0xf50 net/ipv6/tcp_ipv6.c:306
 __inet_stream_connect+0x1c6/0x850 net/ipv4/af_inet.c:655
 tcp_sendmsg_fastopen net/ipv4/tcp.c:1166 [inline]
 tcp_sendmsg_locked+0x18f5/0x1fb0 net/ipv4/tcp.c:1208
 tcp_sendmsg+0x39/0x60 net/ipv4/tcp.c:1436
 inet6_sendmsg+0x6d/0x90 net/ipv6/af_inet6.c:576
 sock_sendmsg_nosec net/socket.c:637 [inline]
 sock_sendmsg+0x9f/0xc0 net/socket.c:657
 __sys_sendto+0x21f/0x320 net/socket.c:1952
 __do_sys_sendto net/socket.c:1964 [inline]
 __se_sys_sendto net/socket.c:1960 [inline]
 __x64_sys_sendto+0x89/0xb0 net/socket.c:1960
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 15289 Comm: syz-executor.0 Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================