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BUG: KCSAN: data-race in kick_pool / wq_worker_running

read-write to 0xffff888237d2a8e4 of 4 bytes by task 35 on cpu 1:
 wq_worker_running+0x9b/0x120 kernel/workqueue.c:1434
 synchronize_rcu_expedited+0x5f8/0x770 kernel/rcu/tree_exp.h:976
 srcu_readers_active_idx_check kernel/rcu/srcutree.c:537 [inline]
 try_check_zero+0x191/0x260 kernel/rcu/srcutree.c:1156
 srcu_advance_state kernel/rcu/srcutree.c:1846 [inline]
 process_srcu+0xd5/0xda0 kernel/rcu/srcutree.c:1973
 process_one_work kernel/workqueue.c:3302 [inline]
 process_scheduled_works+0x4f0/0x9c0 kernel/workqueue.c:3385
 worker_thread+0x58a/0x780 kernel/workqueue.c:3466
 kthread+0x22a/0x280 kernel/kthread.c:436
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff888237d2a8e4 of 4 bytes by task 8461 on cpu 0:
 need_more_worker kernel/workqueue.c:952 [inline]
 kick_pool+0x49/0x2d0 kernel/workqueue.c:1274
 __queue_work+0x899/0xaa0 kernel/workqueue.c:2382
 queue_work_on+0xa9/0x140 kernel/workqueue.c:2432
 wg_queue_enqueue_per_peer_tx drivers/net/wireguard/queueing.h:183 [inline]
 wg_packet_encrypt_worker+0xbf3/0xd70 drivers/net/wireguard/send.c:305
 process_one_work kernel/workqueue.c:3302 [inline]
 process_scheduled_works+0x4f0/0x9c0 kernel/workqueue.c:3385
 worker_thread+0x58a/0x780 kernel/workqueue.c:3466
 kthread+0x22a/0x280 kernel/kthread.c:436
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 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: 8461 Comm: kworker/0:14 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: wg-crypt-wg1 wg_packet_encrypt_worker
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