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BUG: KCSAN: data-race in __skb_wait_for_more_packets / inet_shutdown

write to 0xffff8880a1e23daa of 1 bytes by task 7946 on cpu 1:
 inet_shutdown+0xf3/0x240 net/ipv4/af_inet.c:877
 __sys_shutdown+0x91/0x110 net/socket.c:2206
 __do_sys_shutdown net/socket.c:2214 [inline]
 __se_sys_shutdown net/socket.c:2212 [inline]
 __x64_sys_shutdown+0x35/0x50 net/socket.c:2212
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880a1e23daa of 1 bytes by task 7939 on cpu 0:
 __skb_wait_for_more_packets+0x193/0x340 net/core/datagram.c:105
 __skb_recv_udp+0x3d7/0x580 net/ipv4/udp.c:1712
 udp_recvmsg+0xf3/0xc10 net/ipv4/udp.c:1742
 inet_recvmsg+0xc1/0x250 net/ipv4/af_inet.c:838
 sock_recvmsg_nosec net/socket.c:886 [inline]
 sock_recvmsg net/socket.c:904 [inline]
 sock_recvmsg+0x8e/0xb0 net/socket.c:900
 sock_read_iter+0x185/0x230 net/socket.c:982
 call_read_iter include/linux/fs.h:1895 [inline]
 do_iter_readv_writev+0x570/0x5d0 fs/read_write.c:691
 do_iter_read+0x1e4/0x3a0 fs/read_write.c:933
 vfs_readv+0x9c/0xf0 fs/read_write.c:1053
 do_readv+0x203/0x240 fs/read_write.c:1090
 __do_sys_readv fs/read_write.c:1181 [inline]
 __se_sys_readv fs/read_write.c:1178 [inline]
 __x64_sys_readv+0x4b/0x60 fs/read_write.c:1178
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7939 Comm: syz-executor.2 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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