syzbot

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BUG: KCSAN: data-race in __inet_hash_connect / __inet_hash_connect

write to 0xffffffff894a2c80 of 4 bytes by task 10989 on cpu 1:
 __inet_hash_connect+0x4ab/0x8a0 net/ipv4/inet_hashtables.c:714
 inet_hash_connect+0x55/0xb0 net/ipv4/inet_hashtables.c:741
 tcp_v4_connect+0x686/0xc80 net/ipv4/tcp_ipv4.c:274
 __inet_stream_connect+0x1bc/0x830 net/ipv4/af_inet.c:655
 tcp_sendmsg_fastopen net/ipv4/tcp.c:1164 [inline]
 tcp_sendmsg_locked+0x198d/0x20f0 net/ipv4/tcp.c:1206
 tcp_sendmsg+0x35/0x50 net/ipv4/tcp.c:1433
 inet_sendmsg+0x69/0x90 net/ipv4/af_inet.c:807
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0x98/0xc0 net/socket.c:672
 ____sys_sendmsg+0x493/0x4c0 net/socket.c:2362
 ___sys_sendmsg+0xb5/0x100 net/socket.c:2416
 __sys_sendmsg+0x9b/0x150 net/socket.c:2449
 __do_sys_sendmsg net/socket.c:2458 [inline]
 __se_sys_sendmsg net/socket.c:2456 [inline]
 __x64_sys_sendmsg+0x4c/0x60 net/socket.c:2456
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffffff894a2c80 of 4 bytes by task 10988 on cpu 0:
 __inet_hash_connect+0x153/0x8a0 net/ipv4/inet_hashtables.c:660
 inet_hash_connect+0x55/0xb0 net/ipv4/inet_hashtables.c:741
 tcp_v4_connect+0x686/0xc80 net/ipv4/tcp_ipv4.c:274
 __inet_stream_connect+0x1bc/0x830 net/ipv4/af_inet.c:655
 tcp_sendmsg_fastopen net/ipv4/tcp.c:1164 [inline]
 tcp_sendmsg_locked+0x198d/0x20f0 net/ipv4/tcp.c:1206
 tcp_sendmsg+0x35/0x50 net/ipv4/tcp.c:1433
 inet_sendmsg+0x69/0x90 net/ipv4/af_inet.c:807
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0x98/0xc0 net/socket.c:672
 ____sys_sendmsg+0x493/0x4c0 net/socket.c:2362
 ___sys_sendmsg+0xb5/0x100 net/socket.c:2416
 __sys_sendmsg+0x9b/0x150 net/socket.c:2449
 __do_sys_sendmsg net/socket.c:2458 [inline]
 __se_sys_sendmsg net/socket.c:2456 [inline]
 __x64_sys_sendmsg+0x4c/0x60 net/socket.c:2456
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10988 Comm: syz-executor.3 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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