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BUG: KCSAN: data-race in inet_shutdown / sk_stream_wait_memory

write to 0xffff8880414384ea of 1 bytes by task 3027 on cpu 1:
 inet_shutdown+0x148/0x200 net/ipv4/af_inet.c:887
 __sys_shutdown_sock net/socket.c:2184 [inline]
 __sys_shutdown net/socket.c:2196 [inline]
 __do_sys_shutdown net/socket.c:2204 [inline]
 __se_sys_shutdown+0xf6/0x140 net/socket.c:2202
 __x64_sys_shutdown+0x2d/0x40 net/socket.c:2202
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880414384ea of 1 bytes by task 3021 on cpu 0:
 sk_stream_wait_memory+0x46d/0x700 net/core/stream.c:145
 tcp_sendmsg_locked+0x975/0x21e0 net/ipv4/tcp.c:1419
 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_sendto+0x2a8/0x370 net/socket.c:1975
 __do_sys_sendto net/socket.c:1987 [inline]
 __se_sys_sendto net/socket.c:1983 [inline]
 __x64_sys_sendto+0x74/0x90 net/socket.c:1983
 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: 3021 Comm: syz-executor.4 Not tainted 5.11.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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