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BUG: KCSAN: data-race in __skb_wait_for_more_packets / inet_shutdown

read-write to 0xffff88810cb774aa of 1 bytes by task 20022 on cpu 1:
 inet_shutdown+0x139/0x1f0 net/ipv4/af_inet.c:887
 __sys_shutdown net/socket.c:2204 [inline]
 __do_sys_shutdown net/socket.c:2212 [inline]
 __se_sys_shutdown+0xf2/0x140 net/socket.c:2210
 __x64_sys_shutdown+0x2d/0x40 net/socket.c:2210
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88810cb774aa of 1 bytes by task 20010 on cpu 0:
 __skb_wait_for_more_packets+0xe0/0x2a0 net/core/datagram.c:106
 __skb_recv_udp+0x69e/0x7b0 net/ipv4/udp.c:1771
 udp_recvmsg+0x140/0xa20 net/ipv4/udp.c:1801
 inet_recvmsg+0xa3/0x210 net/ipv4/af_inet.c:848
 sock_recvmsg_nosec net/socket.c:885 [inline]
 sock_recvmsg net/socket.c:903 [inline]
 sock_read_iter+0x19e/0x1e0 net/socket.c:976
 call_read_iter include/linux/fs.h:1897 [inline]
 do_iter_readv_writev+0x2e8/0x360 fs/read_write.c:738
 do_iter_read+0x109/0x4b0 fs/read_write.c:801
 vfs_readv fs/read_write.c:921 [inline]
 do_readv+0x13d/0x280 fs/read_write.c:958
 __do_sys_readv fs/read_write.c:1049 [inline]
 __se_sys_readv fs/read_write.c:1046 [inline]
 __x64_sys_readv+0x41/0x50 fs/read_write.c:1046
 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: 20010 Comm: syz-executor.1 Not tainted 5.10.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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