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

write to 0xffff88803514428e of 2 bytes by task 13177 on cpu 1:
 inet_bind_hash net/ipv4/inet_hashtables.c:98 [inline]
 __inet_hash_connect+0x6d1/0x860 net/ipv4/inet_hashtables.c:810
 inet_hash_connect+0x85/0x90 net/ipv4/inet_hashtables.c:834
 tcp_v4_connect+0x76a/0xba0 net/ipv4/tcp_ipv4.c:275
 __inet_stream_connect+0x5f1/0x710 net/ipv4/af_inet.c:661
 tcp_sendmsg_fastopen net/ipv4/tcp.c:1191 [inline]
 tcp_sendmsg_locked+0x2036/0x2130 net/ipv4/tcp.c:1233
 tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1459
 inet_sendmsg+0x5f/0x80 net/ipv4/af_inet.c:817
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x352/0x4c0 net/socket.c:2336
 ___sys_sendmsg net/socket.c:2390 [inline]
 __sys_sendmsg+0x1ed/0x270 net/socket.c:2423
 __do_sys_sendmsg net/socket.c:2432 [inline]
 __se_sys_sendmsg net/socket.c:2430 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2430
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88803514428e of 2 bytes by task 13179 on cpu 0:
 inet_send_prepare+0x21/0x210 net/ipv4/af_inet.c:802
 inet_sendmsg+0x29/0x80 net/ipv4/af_inet.c:814
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x352/0x4c0 net/socket.c:2336
 ___sys_sendmsg net/socket.c:2390 [inline]
 __sys_sendmsg+0x1ed/0x270 net/socket.c:2423
 __do_sys_sendmsg net/socket.c:2432 [inline]
 __se_sys_sendmsg net/socket.c:2430 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2430
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 13179 Comm: syz-executor.5 Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================