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BUG: KCSAN: data-race in wg_packet_handshake_receive_worker / wg_packet_rx_poll

read to 0xffff888115cd3600 of 8 bytes by interrupt on cpu 1:
 update_rx_stats drivers/net/wireguard/receive.c:28 [inline]
 wg_packet_consume_data_done drivers/net/wireguard/receive.c:365 [inline]
 wg_packet_rx_poll+0xf6b/0x11f0 drivers/net/wireguard/receive.c:481
 __napi_poll+0x65/0x3f0 net/core/dev.c:7023
 napi_poll net/core/dev.c:7090 [inline]
 net_rx_action+0x29e/0x650 net/core/dev.c:7177
 __do_softirq+0x158/0x2de kernel/softirq.c:558
 run_ksoftirqd+0x1f/0x30 kernel/softirq.c:921
 smpboot_thread_fn+0x308/0x4a0 kernel/smpboot.c:164
 kthread+0x2c7/0x2e0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30

write to 0xffff888115cd3600 of 8 bytes by task 1907 on cpu 0:
 update_rx_stats drivers/net/wireguard/receive.c:28 [inline]
 wg_receive_handshake_packet drivers/net/wireguard/receive.c:205 [inline]
 wg_packet_handshake_receive_worker+0x54a/0x6e0 drivers/net/wireguard/receive.c:220
 process_one_work+0x3fc/0x980 kernel/workqueue.c:2298
 worker_thread+0x616/0xa70 kernel/workqueue.c:2445
 kthread+0x2c7/0x2e0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30

value changed: 0x0000000000000244 -> 0x0000000000000264

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1907 Comm: kworker/0:5 Not tainted 5.16.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: wg-kex-wg1 wg_packet_handshake_receive_worker
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