syzbot

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BUG: KCSAN: data-race in __mod_timer / __mod_timer

write to 0xffff88811a061760 of 8 bytes by task 3421 on cpu 1:
 __mod_timer+0x86a/0x9d0 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_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:3288 [inline]
 process_scheduled_works+0x513/0xa10 kernel/workqueue.c:3371
 worker_thread+0x58a/0x780 kernel/workqueue.c:3452
 kthread+0x22a/0x280 kernel/kthread.c:436
 ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff88811a061760 of 8 bytes by task 3403 on cpu 0:
 __mod_timer+0x69/0x9d0 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_consume_data_done drivers/net/wireguard/receive.c:354 [inline]
 wg_packet_rx_poll+0x7f5/0x10f0 drivers/net/wireguard/receive.c:474
 __napi_poll+0x61/0x330 net/core/dev.c:7709
 napi_threaded_poll_loop+0x1db/0x660 net/core/dev.c:7829
 napi_threaded_poll+0x193/0x240 net/core/dev.c:7884
 kthread+0x22a/0x280 kernel/kthread.c:436
 ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x00000000ffffa218 -> 0x00000000ffffa235

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3403 Comm: napi/wg1-0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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