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BUG: KCSAN: data-race in skb_queue_tail / wg_packet_handshake_receive_worker

read-write to 0xffff88812a41fbf0 of 4 bytes by interrupt on cpu 1:
 __skb_insert include/linux/skbuff.h:1917 [inline]
 __skb_queue_before include/linux/skbuff.h:2022 [inline]
 __skb_queue_tail include/linux/skbuff.h:2055 [inline]
 skb_queue_tail+0x75/0x90 net/core/skbuff.c:3162
 wg_packet_receive+0x4ff/0xca0 drivers/net/wireguard/receive.c:569
 wg_receive+0x4a/0x70 drivers/net/wireguard/socket.c:325
 udp_queue_rcv_one_skb+0x6eb/0x7e0 net/ipv4/udp.c:2095
 udp_queue_rcv_skb+0xd2/0x430 net/ipv4/udp.c:2169
 udp_unicast_rcv_skb net/ipv4/udp.c:2327 [inline]
 __udp4_lib_rcv+0x1354/0x1a80 net/ipv4/udp.c:2396
 udp_rcv+0x1d/0x20 net/ipv4/udp.c:2567
 ip_protocol_deliver_rcu+0x1f9/0x3e0 net/ipv4/ip_input.c:204
 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 ip_local_deliver+0x1c0/0x280 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:447 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:428 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 ip_rcv+0x1a6/0x250 net/ipv4/ip_input.c:539
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb+0x8b/0x1b0 net/core/dev.c:5437
 process_backlog+0x23f/0x3d0 net/core/dev.c:6327
 napi_poll+0x181/0x630 net/core/dev.c:6805
 net_rx_action+0x17a/0x480 net/core/dev.c:6888
 __do_softirq+0x13c/0x2c3 kernel/softirq.c:343
 run_ksoftirqd+0x13/0x20 kernel/softirq.c:650
 smpboot_thread_fn+0x34f/0x520 kernel/smpboot.c:165
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read to 0xffff88812a41fbf0 of 4 bytes by task 29764 on cpu 0:
 wg_receive_handshake_packet drivers/net/wireguard/receive.c:119 [inline]
 wg_packet_handshake_receive_worker+0xbd/0x440 drivers/net/wireguard/receive.c:220
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x64a/0xaa0 kernel/workqueue.c:2421
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 29764 Comm: kworker/0:2 Not tainted 5.11.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: wg-kex-wg2 wg_packet_handshake_receive_worker
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