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BUG: KCSAN: data-race in poll_schedule_timeout.constprop.0 / pollwake

write to 0xffffc90004eefc20 of 4 bytes by interrupt on cpu 0:
 __pollwake fs/select.c:197 [inline]
 pollwake+0xe6/0x140 fs/select.c:217
 __wake_up_common+0x76/0x180 kernel/sched/wait.c:93
 __wake_up_common_lock+0x77/0xb0 kernel/sched/wait.c:123
 sock_def_readable+0x9d/0x130 net/core/sock.c:2819
 __udp_enqueue_schedule_skb+0x4a2/0x640 net/ipv4/udp.c:1506
 __udpv6_queue_rcv_skb net/ipv6/udp.c:577 [inline]
 udpv6_queue_rcv_one_skb+0x793/0xb60 net/ipv6/udp.c:672
 udpv6_queue_rcv_skb+0xac/0x430 net/ipv6/udp.c:689
 udp6_unicast_rcv_skb.isra.0+0xd2/0x190 net/ipv6/udp.c:831
 __udp6_lib_rcv+0x699/0x1870 net/ipv6/udp.c:915
 udpv6_rcv+0x28/0x40 net/ipv6/udp.c:1017
 ip6_protocol_deliver_rcu+0x21e/0xba0 net/ipv6/ip6_input.c:433
 ip6_input_finish+0x2c/0x40 net/ipv6/ip6_input.c:474
 NF_HOOK include/linux/netfilter.h:307 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 ip6_input+0x180/0x190 net/ipv6/ip6_input.c:483
 dst_input include/net/dst.h:441 [inline]
 ip6_rcv_finish+0x10c/0x140 net/ipv6/ip6_input.c:76
 NF_HOOK include/linux/netfilter.h:307 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 ipv6_rcv+0x1ae/0x1c0 net/ipv6/ip6_input.c:307
 __netif_receive_skb_one_core+0x9f/0xe0 net/core/dev.c:5187
 __netif_receive_skb+0x33/0xf0 net/core/dev.c:5301
 process_backlog+0x213/0x4c0 net/core/dev.c:6133
 napi_poll net/core/dev.c:6571 [inline]
 net_rx_action+0x3ad/0xac0 net/core/dev.c:6639
 __do_softirq+0x118/0x34a kernel/softirq.c:292
 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082
 do_softirq.part.0+0x66/0x70 kernel/softirq.c:337
 do_softirq kernel/softirq.c:329 [inline]
 __local_bh_enable_ip+0x70/0x80 kernel/softirq.c:189
 local_bh_enable include/linux/bottom_half.h:32 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline]
 ip6_finish_output2+0x730/0xf60 net/ipv6/ip6_output.c:118
 __ip6_finish_output net/ipv6/ip6_output.c:143 [inline]
 __ip6_finish_output+0x2cb/0x320 net/ipv6/ip6_output.c:128
 ip6_finish_output+0x3e/0x160 net/ipv6/ip6_output.c:153
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip6_output+0x104/0x2a0 net/ipv6/ip6_output.c:176
 dst_output include/net/dst.h:435 [inline]
 ip6_local_out+0x70/0x90 net/ipv6/output_core.c:179
 ip6_send_skb+0x4f/0x110 net/ipv6/ip6_output.c:1865
 udp_v6_send_skb.isra.0+0x3f9/0xa80 net/ipv6/udp.c:1175
 udpv6_sendmsg+0x19e1/0x1d40 net/ipv6/udp.c:1473
 inet6_sendmsg+0x69/0x90 net/ipv6/af_inet6.c:577
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0x98/0xc0 net/socket.c:672
 ____sys_sendmsg+0x207/0x4c0 net/socket.c:2362
 ___sys_sendmsg+0xb5/0x100 net/socket.c:2416
 __sys_sendmmsg+0x10e/0x310 net/socket.c:2506
 __do_sys_sendmmsg net/socket.c:2535 [inline]
 __se_sys_sendmmsg net/socket.c:2532 [inline]
 __x64_sys_sendmmsg+0x60/0x80 net/socket.c:2532
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffc90004eefc20 of 4 bytes by task 17899 on cpu 1:
 poll_schedule_timeout.constprop.0+0x4c/0xc0 fs/select.c:242
 do_poll fs/select.c:951 [inline]
 do_sys_poll+0x670/0x990 fs/select.c:1001
 __do_sys_ppoll fs/select.c:1101 [inline]
 __se_sys_ppoll fs/select.c:1081 [inline]
 __x64_sys_ppoll+0x156/0x190 fs/select.c:1081
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 17899 Comm: syz-executor.1 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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