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BUG: KCSAN: data-race in __skb_wait_for_more_packets / inet_shutdown

write to 0xffff888094a07cea of 1 bytes by task 11871 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 0xffff888094a07cea of 1 bytes by task 11866 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
 udpv6_recvmsg+0x2a1/0xf00 net/ipv6/udp.c:288
 inet6_recvmsg+0xc1/0x250 net/ipv6/af_inet6.c:592
 sock_recvmsg_nosec net/socket.c:886 [inline]
 sock_recvmsg net/socket.c:904 [inline]
 sock_recvmsg+0x8e/0xb0 net/socket.c:900
 ____sys_recvmsg+0x144/0x350 net/socket.c:2566
 ___sys_recvmsg+0xb2/0x100 net/socket.c:2608
 do_recvmmsg+0x17a/0x540 net/socket.c:2706
 __sys_recvmmsg+0x1f1/0x200 net/socket.c:2785
 __do_sys_recvmmsg net/socket.c:2808 [inline]
 __se_sys_recvmmsg net/socket.c:2801 [inline]
 __x64_sys_recvmmsg+0x82/0xb0 net/socket.c:2801
 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: 11866 Comm: syz-executor.5 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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