syzbot

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BUG: KCSAN: data-race in __inet_hash_connect / inet_send_prepare

write to 0xffff8880834cc1ce of 2 bytes by task 1739 on cpu 1:
 inet_bind_hash net/ipv4/inet_hashtables.c:95 [inline]
 __inet_hash_connect+0x4c7/0x8b0 net/ipv4/inet_hashtables.c:718
 inet_hash_connect+0x5c/0xc0 net/ipv4/inet_hashtables.c:742
 tcp_v4_connect+0x693/0xc60 net/ipv4/tcp_ipv4.c:274
 __inet_stream_connect+0x1c6/0x850 net/ipv4/af_inet.c:655
 tcp_sendmsg_fastopen net/ipv4/tcp.c:1166 [inline]
 tcp_sendmsg_locked+0x1951/0x2040 net/ipv4/tcp.c:1208
 tcp_sendmsg+0x39/0x60 net/ipv4/tcp.c:1436
 inet_sendmsg+0x6d/0x90 net/ipv4/af_inet.c:807
 sock_sendmsg_nosec net/socket.c:639 [inline]
 sock_sendmsg+0x9f/0xc0 net/socket.c:659
 __sys_sendto+0x21f/0x320 net/socket.c:1985
 __do_sys_sendto net/socket.c:1997 [inline]
 __se_sys_sendto net/socket.c:1993 [inline]
 __x64_sys_sendto+0x89/0xb0 net/socket.c:1993
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880834cc1ce of 2 bytes by task 1740 on cpu 0:
 inet_send_prepare+0x4a/0x200 net/ipv4/af_inet.c:792
 inet_sendmsg+0x37/0x90 net/ipv4/af_inet.c:804
 sock_sendmsg_nosec net/socket.c:639 [inline]
 sock_sendmsg+0x9f/0xc0 net/socket.c:659
 __sys_sendto+0x21f/0x320 net/socket.c:1985
 __do_sys_sendto net/socket.c:1997 [inline]
 __se_sys_sendto net/socket.c:1993 [inline]
 __x64_sys_sendto+0x89/0xb0 net/socket.c:1993
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1740 Comm: syz-executor.4 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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