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BUG: KCSAN: data-race in __skb_wait_for_more_packets / inet_shutdown

read to 0xffff888099b7d4aa of 1 bytes by task 5169 on cpu 1:
 __skb_wait_for_more_packets+0x17e/0x330 net/core/datagram.c:104
 __skb_recv_udp+0x3c4/0x560 net/ipv4/udp.c:1694
 udp_recvmsg+0xe4/0xb40 net/ipv4/udp.c:1723
 inet_recvmsg+0xbb/0x250 net/ipv4/af_inet.c:838
 sock_recvmsg_nosec net/socket.c:871 [inline]
 sock_recvmsg net/socket.c:889 [inline]
 sock_recvmsg+0x92/0xb0 net/socket.c:885
 __sys_recvfrom+0x1ae/0x2d0 net/socket.c:2009
 __do_sys_recvfrom net/socket.c:2027 [inline]
 __se_sys_recvfrom net/socket.c:2023 [inline]
 __x64_sys_recvfrom+0x89/0xb0 net/socket.c:2023
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff888099b7d4aa of 1 bytes by task 5174 on cpu 0:
 inet_shutdown+0x105/0x270 net/ipv4/af_inet.c:877
 __sys_shutdown+0xa2/0x130 net/socket.c:2160
 __do_sys_shutdown net/socket.c:2168 [inline]
 __se_sys_shutdown net/socket.c:2166 [inline]
 __x64_sys_shutdown+0x3a/0x50 net/socket.c:2166
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 5174 Comm: syz-executor.0 Not tainted 5.4.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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