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BUG: KCSAN: data-race in __inet_hash_connect / inet_send_prepare

write to 0xffff88812bc9130e of 2 bytes by task 11763 on cpu 0:
 inet_bind_hash net/ipv4/inet_hashtables.c:98 [inline]
 __inet_hash_connect+0x716/0x900 net/ipv4/inet_hashtables.c:829
 inet6_hash_connect+0x77/0x80 net/ipv6/inet6_hashtables.c:327
 tcp_v6_connect+0x983/0xbb0 net/ipv6/tcp_ipv6.c:311
 __inet_stream_connect+0x156/0x6d0 net/ipv4/af_inet.c:664
 tcp_sendmsg_fastopen net/ipv4/tcp.c:1189 [inline]
 tcp_sendmsg_locked+0x22e9/0x23f0 net/ipv4/tcp.c:1231
 tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1457
 inet6_sendmsg+0x5f/0x80 net/ipv6/af_inet6.c:642
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 __sys_sendto+0x2a8/0x370 net/socket.c:1977
 __do_sys_sendto net/socket.c:1989 [inline]
 __se_sys_sendto net/socket.c:1985 [inline]
 __x64_sys_sendto+0x74/0x90 net/socket.c:1985
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88812bc9130e of 2 bytes by task 11839 on cpu 1:
 inet_send_prepare+0x21/0x210 net/ipv4/af_inet.c:806
 inet6_sendmsg+0x29/0x80 net/ipv6/af_inet6.c:639
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 ____sys_sendmsg+0x360/0x4d0 net/socket.c:2350
 ___sys_sendmsg net/socket.c:2404 [inline]
 __sys_sendmmsg+0x315/0x4b0 net/socket.c:2490
 __do_sys_sendmmsg net/socket.c:2519 [inline]
 __se_sys_sendmmsg net/socket.c:2516 [inline]
 __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2516
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 11839 Comm: syz-executor.0 Not tainted 5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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