==================================================================
BUG: KCSAN: data-race in insert_work / wq_worker_running

read-write to 0xffff888237d2c8e4 of 4 bytes by task 901 on cpu 1:
 wq_worker_running+0x98/0x120 kernel/workqueue.c:1068
 schedule_timeout+0xcc/0x230 kernel/time/timer.c:2167
 schedule_timeout_uninterruptible kernel/time/timer.c:2201 [inline]
 msleep+0x52/0x70 kernel/time/timer.c:2322
 nsim_fib4_rt_add drivers/net/netdevsim/fib.c:369 [inline]
 nsim_fib4_rt_insert drivers/net/netdevsim/fib.c:432 [inline]
 nsim_fib4_event drivers/net/netdevsim/fib.c:464 [inline]
 nsim_fib_event drivers/net/netdevsim/fib.c:884 [inline]
 nsim_fib_event_work+0x1574/0x2250 drivers/net/netdevsim/fib.c:1492
 process_one_work+0x434/0x860 kernel/workqueue.c:2597
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2748
 kthread+0x1d7/0x210 kernel/kthread.c:389
 ret_from_fork+0x2e/0x40 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

read to 0xffff888237d2c8e4 of 4 bytes by task 3187 on cpu 0:
 __need_more_worker kernel/workqueue.c:827 [inline]
 insert_work+0x10e/0x190 kernel/workqueue.c:1560
 __queue_work+0x722/0x980 kernel/workqueue.c:1714
 queue_work_on+0x95/0xf0 kernel/workqueue.c:1744
 wg_queue_enqueue_per_peer_tx+0x127/0x270 drivers/net/wireguard/queueing.h:188
 wg_packet_encrypt_worker+0x885/0xa30 drivers/net/wireguard/send.c:305
 process_one_work+0x434/0x860 kernel/workqueue.c:2597
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2748
 kthread+0x1d7/0x210 kernel/kthread.c:389
 ret_from_fork+0x2e/0x40 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3187 Comm: kworker/0:5 Not tainted 6.5.0-rc4-syzkaller-00051-g7bafbd4027ae #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
Workqueue: wg-crypt-wg0 wg_packet_encrypt_worker
==================================================================
bridge0: port 1(bridge_slave_0) entered blocking state
bridge0: port 1(bridge_slave_0) entered forwarding state
bridge0: port 2(bridge_slave_1) entered blocking state
bridge0: port 2(bridge_slave_1) entered forwarding state
kernel write not supported for file bpf-prog (pid: 3187 comm: kworker/0:5)