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BUG: KCSAN: data-race in tcp_disconnect / tcp_poll

write to 0xffff88802acc94f0 of 4 bytes by task 528 on cpu 0:
 tcp_disconnect+0x15a/0xd40 net/ipv4/tcp.c:2653
 __inet_stream_connect+0x16e/0x690 net/ipv4/af_inet.c:630
 inet_stream_connect+0x44/0x70 net/ipv4/af_inet.c:725
 __sys_connect_file net/socket.c:1852 [inline]
 __sys_connect+0x245/0x280 net/socket.c:1869
 __do_sys_connect net/socket.c:1879 [inline]
 __se_sys_connect net/socket.c:1876 [inline]
 __x64_sys_connect+0x3d/0x50 net/socket.c:1876
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88802acc94f0 of 4 bytes by task 514 on cpu 1:
 tcp_poll+0x61f/0x690 net/ipv4/tcp.c:598
 sock_poll+0x188/0x1a0 net/socket.c:1265
 vfs_poll include/linux/poll.h:90 [inline]
 do_pollfd fs/select.c:869 [inline]
 do_poll fs/select.c:917 [inline]
 do_sys_poll+0x611/0xb80 fs/select.c:1011
 __do_sys_ppoll fs/select.c:1111 [inline]
 __se_sys_ppoll+0x169/0x1b0 fs/select.c:1091
 __x64_sys_ppoll+0x63/0x70 fs/select.c:1091
 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: 1 PID: 514 Comm: syz-executor.2 Not tainted 5.10.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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