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BUG: KCSAN: data-race in __mod_timer / __mod_timer

write to 0xffff88812201bc90 of 8 bytes by task 1907 on cpu 1:
 __mod_timer+0x9f5/0xc30 kernel/time/timer.c:1012
 mod_timer+0x1b/0x20 kernel/time/timer.c:1108
 mod_peer_timer drivers/net/wireguard/timers.c:37 [inline]
 wg_timers_any_authenticated_packet_traversal+0xc4/0xf0 drivers/net/wireguard/timers.c:215
 wg_packet_create_data_done drivers/net/wireguard/send.c:247 [inline]
 wg_packet_tx_worker+0xf7/0x360 drivers/net/wireguard/send.c:276
 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

read to 0xffff88812201bc90 of 8 bytes by task 75 on cpu 0:
 __mod_timer+0x7c/0xc30 kernel/time/timer.c:980
 mod_timer+0x1b/0x20 kernel/time/timer.c:1108
 mod_peer_timer drivers/net/wireguard/timers.c:37 [inline]
 wg_timers_any_authenticated_packet_traversal+0xc4/0xf0 drivers/net/wireguard/timers.c:215
 wg_receive_handshake_packet drivers/net/wireguard/receive.c:209 [inline]
 wg_packet_handshake_receive_worker+0x591/0x6e0 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: 0x00000000ffffc7f9 -> 0x00000000ffffc7fa

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 75 Comm: kworker/0:2 Not tainted 5.16.0-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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