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BUG: KCSAN: data-race in __mod_timer / __mod_timer

write to 0xffff8881ac549dd0 of 8 bytes by task 26337 on cpu 0:
 __mod_timer+0x784/0x840 kernel/time/timer.c:1078
 mod_timer+0x1f/0x30 kernel/time/timer.c:1195
 mod_peer_timer drivers/net/wireguard/timers.c:37 [inline]
 wg_timers_any_authenticated_packet_traversal+0xd0/0x100 drivers/net/wireguard/timers.c:218
 wg_packet_consume_data_done drivers/net/wireguard/receive.c:354 [inline]
 wg_packet_rx_poll+0x7f5/0x1160 drivers/net/wireguard/receive.c:474
 __napi_poll+0x66/0x310 net/core/dev.c:7506
 napi_threaded_poll_loop+0x18a/0x4a0 net/core/dev.c:7625
 napi_threaded_poll+0xda/0x160 net/core/dev.c:7652
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x11f/0x1b0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff8881ac549dd0 of 8 bytes by task 10794 on cpu 1:
 __mod_timer+0x69/0x840 kernel/time/timer.c:1038
 mod_timer+0x1f/0x30 kernel/time/timer.c:1195
 mod_peer_timer drivers/net/wireguard/timers.c:37 [inline]
 wg_timers_any_authenticated_packet_traversal+0xd0/0x100 drivers/net/wireguard/timers.c:218
 wg_packet_create_data_done drivers/net/wireguard/send.c:247 [inline]
 wg_packet_tx_worker+0xeb/0x330 drivers/net/wireguard/send.c:276
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0x4cb/0x9d0 kernel/workqueue.c:3319
 worker_thread+0x582/0x770 kernel/workqueue.c:3400
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x11f/0x1b0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x0000000100023837 -> 0x0000000100023838

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 10794 Comm: kworker/1:15 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: wg-crypt-wg2 wg_packet_tx_worker
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