==================================================================
BUG: KCSAN: data-race in __mod_timer / __mod_timer

write to 0xffff88811bbe0a70 of 8 bytes by task 11810 on cpu 0:
 __mod_timer+0x671/0x990 kernel/time/timer.c:1127
 mod_timer+0x1f/0x30 kernel/time/timer.c:1196
 mod_peer_timer drivers/net/wireguard/timers.c:37 [inline]
 wg_timers_any_authenticated_packet_traversal+0xd1/0x100 drivers/net/wireguard/timers.c:218
 wg_packet_consume_data_done drivers/net/wireguard/receive.c:354 [inline]
 wg_packet_rx_poll+0x7b2/0x1090 drivers/net/wireguard/receive.c:474
 __napi_poll+0x61/0x300 net/core/dev.c:7966
 napi_threaded_poll_loop+0x1e9/0x6c0 net/core/dev.c:8086
 napi_threaded_poll+0x193/0x240 net/core/dev.c:8141
 kthread+0x223/0x270 kernel/kthread.c:436
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff88811bbe0a70 of 8 bytes by task 23 on cpu 1:
 __mod_timer+0x69/0x990 kernel/time/timer.c:1039
 mod_timer+0x1f/0x30 kernel/time/timer.c:1196
 mod_peer_timer drivers/net/wireguard/timers.c:37 [inline]
 wg_timers_any_authenticated_packet_traversal+0xd1/0x100 drivers/net/wireguard/timers.c:218
 wg_packet_create_data_done drivers/net/wireguard/send.c:247 [inline]
 wg_packet_tx_worker+0x11c/0x310 drivers/net/wireguard/send.c:276
 process_one_work kernel/workqueue.c:3495 [inline]
 process_scheduled_works+0x53f/0xa20 kernel/workqueue.c:3578
 worker_thread+0x56c/0x770 kernel/workqueue.c:3659
 kthread+0x223/0x270 kernel/kthread.c:436
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x00000000ffffe07c -> 0x00000000ffffe36c

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 23 Comm: kworker/1:0 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Workqueue: wg-crypt-wg2 wg_packet_tx_worker
==================================================================