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BUG: KCSAN: data-race in wg_index_hashtable_insert / wg_index_hashtable_lookup

write to 0xffff88802969aae4 of 4 bytes by task 15026 on cpu 1:
 wg_index_hashtable_insert+0xd2/0x2b0 drivers/net/wireguard/peerlookup.c:132
 wg_noise_handshake_create_response+0x5dc/0x690 drivers/net/wireguard/noise.c:680
 wg_packet_send_handshake_response+0x59/0x130 drivers/net/wireguard/send.c:94
 wg_receive_handshake_packet drivers/net/wireguard/receive.c:161 [inline]
 wg_packet_handshake_receive_worker+0x2a5/0x440 drivers/net/wireguard/receive.c:220
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2272
 worker_thread+0x635/0xb90 kernel/workqueue.c:2418
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read to 0xffff88802969aae4 of 4 bytes by task 26682 on cpu 0:
 wg_index_hashtable_lookup+0x59/0x110 drivers/net/wireguard/peerlookup.c:211
 wg_noise_handshake_consume_response+0xb1/0x740 drivers/net/wireguard/noise.c:714
 wg_receive_handshake_packet drivers/net/wireguard/receive.c:173 [inline]
 wg_packet_handshake_receive_worker+0x2b3/0x440 drivers/net/wireguard/receive.c:220
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2272
 worker_thread+0x635/0xb90 kernel/workqueue.c:2418
 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: 26682 Comm: kworker/0:2 Not tainted 5.10.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: wg-kex-wg0 wg_packet_handshake_receive_worker
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