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BUG: KCSAN: data-race in __skb_wait_for_more_packets / inet_shutdown

read-write to 0xffff888107ae86ea of 1 bytes by task 29951 on cpu 0:
 inet_shutdown+0x139/0x1f0 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 0xffff888107ae86ea of 1 bytes by task 29950 on cpu 1:
 __skb_wait_for_more_packets+0xdd/0x2e0 net/core/datagram.c:106
 __skb_recv_udp+0x729/0x850 net/ipv4/udp.c:1770
 udp_recvmsg+0x140/0xa20 net/ipv4/udp.c:1800
 inet_recvmsg+0xa3/0x210 net/ipv4/af_inet.c:848
 sock_recvmsg_nosec net/socket.c:886 [inline]
 sock_recvmsg net/socket.c:904 [inline]
 __sys_recvfrom+0x1d7/0x2a0 net/socket.c:2032
 __do_sys_recvfrom net/socket.c:2050 [inline]
 __se_sys_recvfrom net/socket.c:2046 [inline]
 __x64_sys_recvfrom+0x74/0x90 net/socket.c:2046
 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: 29950 Comm: syz-executor.0 Not tainted 5.11.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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