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BUG: KCSAN: data-race in insert_work / wq_worker_running

read-write to 0xffff888237d2a7e0 of 4 bytes by task 1913 on cpu 1:
 wq_worker_running+0x96/0xe0 kernel/workqueue.c:880
 schedule_timeout+0xc1/0x290 kernel/time/timer.c:1935
 schedule_timeout_uninterruptible kernel/time/timer.c:1969 [inline]
 msleep+0x57/0x70 kernel/time/timer.c:2091
 nsim_fib4_rt_add drivers/net/netdevsim/fib.c:367 [inline]
 nsim_fib4_rt_insert drivers/net/netdevsim/fib.c:430 [inline]
 nsim_fib4_event drivers/net/netdevsim/fib.c:462 [inline]
 nsim_fib_event drivers/net/netdevsim/fib.c:882 [inline]
 nsim_fib_event_work+0x1897/0x2c30 drivers/net/netdevsim/fib.c:1478
 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 0xffff888237d2a7e0 of 4 bytes by task 30 on cpu 0:
 __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: 0 PID: 30 Comm: kworker/0:1 Not tainted 5.19.0-rc6-syzkaller-00364-g9b59ec8d50a1-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
Workqueue: wg-crypt-wg2 wg_packet_encrypt_worker
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