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BUG: KCSAN: data-race in kick_pool / wq_worker_running

read-write to 0xffff888237d299a4 of 4 bytes by task 21791 on cpu 1:
 wq_worker_running+0x98/0x130 kernel/workqueue.c:1400
 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:6917
 __mutex_lock_common kernel/locking/mutex.c:678 [inline]
 __mutex_lock+0x420/0xa00 kernel/locking/mutex.c:746
 __mutex_lock_slowpath+0xa/0x10 kernel/locking/mutex.c:1033
 mutex_lock+0x2d/0x40 kernel/locking/mutex.c:277
 exp_funnel_lock kernel/rcu/tree_exp.h:336 [inline]
 synchronize_rcu_expedited+0x18d/0x790 kernel/rcu/tree_exp.h:998
 synchronize_rcu+0x4a/0x320 kernel/rcu/tree.c:3311
 xfrm_state_gc_task+0x96/0x110 net/xfrm/xfrm_state.c:631
 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 task 1039 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_peer_tx+0x124/0x270 drivers/net/wireguard/queueing.h:188
 wg_packet_encrypt_worker+0x9ee/0xb90 drivers/net/wireguard/send.c:305
 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

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 1039 Comm: kworker/0:2 Tainted: G        W           6.15.0-rc2-syzkaller-00042-g1a1d569a75f3 #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: wg-crypt-wg0 wg_packet_encrypt_worker
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