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BUG: KCSAN: data-race in kick_pool / wq_worker_running

read-write to 0xffff888237d299a4 of 4 bytes by task 23 on cpu 1:
 wq_worker_running+0x98/0x130 kernel/workqueue.c:1400
 schedule_timeout+0xbc/0x170 kernel/time/sleep_timeout.c:99
 schedule_timeout_uninterruptible kernel/time/sleep_timeout.c:158 [inline]
 msleep+0x4f/0x90 kernel/time/sleep_timeout.c:318
 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+0x13dd/0x2290 drivers/net/netdevsim/fib.c:1493
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x4de/0xa20 kernel/workqueue.c:3319
 worker_thread+0x52c/0x710 kernel/workqueue.c:3400
 kthread+0x4b7/0x540 kernel/kthread.c:464
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff888237d299a4 of 4 bytes by interrupt on cpu 0:
 need_more_worker kernel/workqueue.c:934 [inline]
 kick_pool+0x4d/0x2c0 kernel/workqueue.c:1240
 __queue_work+0x8f8/0xbb0 kernel/workqueue.c:2342
 queue_work_on+0xdf/0x190 kernel/workqueue.c:2392
 wg_queue_enqueue_per_device_and_peer drivers/net/wireguard/queueing.h:176 [inline]
 wg_packet_create_data drivers/net/wireguard/send.c:320 [inline]
 wg_packet_send_staged_packets+0x841/0xae0 drivers/net/wireguard/send.c:388
 wg_packet_send_keepalive+0xe5/0x100 drivers/net/wireguard/send.c:239
 wg_expired_send_persistent_keepalive+0x3c/0x50 drivers/net/wireguard/timers.c:141
 call_timer_fn+0x3a/0x300 kernel/time/timer.c:1789
 expire_timers kernel/time/timer.c:1840 [inline]
 __run_timers kernel/time/timer.c:2414 [inline]
 __run_timer_base+0x41e/0x640 kernel/time/timer.c:2426
 run_timer_base kernel/time/timer.c:2435 [inline]
 run_timer_softirq+0x31/0x70 kernel/time/timer.c:2445
 handle_softirqs+0xbf/0x280 kernel/softirq.c:579
 do_softirq+0x62/0xa0 kernel/softirq.c:480
 __local_bh_enable_ip+0x6e/0x70 kernel/softirq.c:407
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 bpf_test_run+0x226/0x4a0 net/bpf/test_run.c:437
 bpf_prog_test_run_skb+0x857/0xbe0 net/bpf/test_run.c:1093
 bpf_prog_test_run+0x20e/0x3a0 kernel/bpf/syscall.c:4427
 __sys_bpf+0x440/0x800 kernel/bpf/syscall.c:5852
 __do_sys_bpf kernel/bpf/syscall.c:5941 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5939 [inline]
 __x64_sys_bpf+0x43/0x50 kernel/bpf/syscall.c:5939
 x64_sys_call+0x23da/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 18180 Comm: syz.1.5118 Tainted: G        W           6.15.0-rc2-syzkaller-00257-gb5c6891b2c5b #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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