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BUG: KCSAN: data-race in inet_shutdown / sk_stream_wait_memory

write to 0xffff8881238682ea of 1 bytes by task 2440 on cpu 0:
 inet_shutdown+0xf3/0x240 net/ipv4/af_inet.c:877
 __sys_shutdown+0x91/0x110 net/socket.c:2208
 __do_sys_shutdown net/socket.c:2216 [inline]
 __se_sys_shutdown net/socket.c:2214 [inline]
 __x64_sys_shutdown+0x35/0x50 net/socket.c:2214
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8881238682ea of 1 bytes by task 2433 on cpu 1:
 sk_stream_wait_memory+0x480/0x850 net/core/stream.c:145
 tcp_sendmsg_locked+0x98c/0x20f0 net/ipv4/tcp.c:1393
 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_sendto+0x1e2/0x2c0 net/socket.c:2000
 __do_sys_sendto net/socket.c:2012 [inline]
 __se_sys_sendto net/socket.c:2008 [inline]
 __x64_sys_sendto+0x7e/0xa0 net/socket.c:2008
 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: 1 PID: 2433 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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