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BUG: KCSAN: data-race in decrypt_packet / wg_packet_rx_poll

write to 0xffff8880b66ea180 of 8 bytes by interrupt on cpu 1:
 counter_validate drivers/net/wireguard/receive.c:328 [inline]
 wg_packet_rx_poll+0x3a4/0x1400 drivers/net/wireguard/receive.c:478
 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
 run_ksoftirqd+0x41/0x60 kernel/softirq.c:604
 smpboot_thread_fn+0x374/0x4a0 kernel/smpboot.c:165
 kthread+0x203/0x230 kernel/kthread.c:268
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

read to 0xffff8880b66ea180 of 8 bytes by task 4137 on cpu 0:
 decrypt_packet+0xd2/0x370 drivers/net/wireguard/receive.c:259
 wg_packet_decrypt_worker+0x13c/0x3f0 drivers/net/wireguard/receive.c:517
 process_one_work+0x424/0x930 kernel/workqueue.c:2268
 worker_thread+0x9a/0x7e0 kernel/workqueue.c:2414
 kthread+0x203/0x230 kernel/kthread.c:268
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4137 Comm: kworker/0:2 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: wg-crypt-wg2 wg_packet_decrypt_worker
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