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BUG: KCSAN: data-race in insert_work / wq_worker_running

read-write to 0xffff888237c2a860 of 4 bytes by task 13874 on cpu 0:
 wq_worker_running+0x96/0xe0 kernel/workqueue.c:880
 schedule_timeout+0xc1/0x290 kernel/time/timer.c:1935
 synchronize_rcu_expedited_wait_once kernel/rcu/tree_exp.h:571 [inline]
 synchronize_rcu_expedited_wait+0x22a/0xbf0 kernel/rcu/tree_exp.h:622
 rcu_exp_wait_wake kernel/rcu/tree_exp.h:688 [inline]
 rcu_exp_sel_wait_wake+0x355/0x730 kernel/rcu/tree_exp.h:722
 wait_rcu_exp_gp+0x1a/0x20 kernel/rcu/tree_exp.h:512
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

read to 0xffff888237c2a860 of 4 bytes by task 30528 on cpu 1:
 __need_more_worker kernel/workqueue.c:785 [inline]
 insert_work+0x10e/0x190 kernel/workqueue.c:1365
 __queue_work+0x69e/0x8e0 kernel/workqueue.c:1517
 queue_work_on+0x7e/0xe0 kernel/workqueue.c:1545
 wg_queue_enqueue_per_peer_tx+0x10b/0x200 drivers/net/wireguard/queueing.h:191
 wg_packet_encrypt_worker+0x8b4/0xab0 drivers/net/wireguard/send.c:305
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 30528 Comm: kworker/1:0 Not tainted 5.19.0-syzkaller-10895-g6614a3c3164a-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Workqueue: wg-crypt-wg0 wg_packet_encrypt_worker
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