syzbot

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BUG: KCSAN: data-race in __skb_wait_for_more_packets / inet_shutdown

write to 0xffff888122c0d46a of 1 bytes by task 25495 on cpu 0:
 inet_shutdown+0x146/0x200 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 0xffff888122c0d46a of 1 bytes by task 25464 on cpu 1:
 __skb_wait_for_more_packets+0xe0/0x2a0 net/core/datagram.c:106
 __skb_recv_udp+0x6be/0x7d0 net/ipv4/udp.c:1771
 udp_recvmsg+0x134/0xa10 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]
 __sys_recvfrom+0x1cb/0x290 net/socket.c:2049
 __do_sys_recvfrom net/socket.c:2067 [inline]
 __se_sys_recvfrom net/socket.c:2063 [inline]
 __x64_sys_recvfrom+0x74/0x90 net/socket.c:2063
 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: 25464 Comm: syz-executor.1 Not tainted 5.9.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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