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BUG: KCSAN: data-race in wg_packet_send_staged_packets / wg_packet_send_staged_packets

write to 0xffff888025153a48 of 4 bytes by task 4824 on cpu 1:
 wg_cpumask_next_online drivers/net/wireguard/queueing.h:135 [inline]
 wg_queue_enqueue_per_device_and_peer drivers/net/wireguard/queueing.h:178 [inline]
 wg_packet_create_data drivers/net/wireguard/send.c:320 [inline]
 wg_packet_send_staged_packets+0x436/0x7e0 drivers/net/wireguard/send.c:387
 wg_packet_send_keepalive+0xfc/0x110 drivers/net/wireguard/send.c:239
 wg_receive_handshake_packet drivers/net/wireguard/receive.c:193 [inline]
 wg_packet_handshake_receive_worker+0x313/0x450 drivers/net/wireguard/receive.c:220
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x616/0xa70 kernel/workqueue.c:2421
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff888025153a48 of 4 bytes by task 9703 on cpu 0:
 wg_cpumask_next_online drivers/net/wireguard/queueing.h:131 [inline]
 wg_queue_enqueue_per_device_and_peer drivers/net/wireguard/queueing.h:178 [inline]
 wg_packet_create_data drivers/net/wireguard/send.c:320 [inline]
 wg_packet_send_staged_packets+0x3fb/0x7e0 drivers/net/wireguard/send.c:387
 wg_packet_send_keepalive+0xfc/0x110 drivers/net/wireguard/send.c:239
 wg_receive_handshake_packet drivers/net/wireguard/receive.c:193 [inline]
 wg_packet_handshake_receive_worker+0x313/0x450 drivers/net/wireguard/receive.c:220
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x616/0xa70 kernel/workqueue.c:2421
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 9703 Comm: kworker/0:6 Not tainted 5.12.0-rc4-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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