syzbot

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BUG: KCSAN: data-race in kick_pool / wq_worker_running

read-write to 0xffff888237d2a524 of 4 bytes by task 4019 on cpu 1:
 wq_worker_running+0x95/0x120 kernel/workqueue.c:1400
 synchronize_rcu_expedited+0x5ef/0x770 kernel/rcu/tree_exp.h:971
 synchronize_rcu+0x35/0x2e0 kernel/rcu/tree.c:3348
 xfrm_state_gc_task+0x98/0x650 net/xfrm/xfrm_state.c:633
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3340
 worker_thread+0x582/0x770 kernel/workqueue.c:3421
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x149/0x290 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

read to 0xffff888237d2a524 of 4 bytes by task 10 on cpu 0:
 need_more_worker kernel/workqueue.c:934 [inline]
 kick_pool+0x49/0x2d0 kernel/workqueue.c:1240
 __queue_work+0x897/0xae0 kernel/workqueue.c:2336
 queue_work_on+0xa9/0x130 kernel/workqueue.c:2386
 wg_queue_enqueue_per_peer_tx drivers/net/wireguard/queueing.h:183 [inline]
 wg_packet_encrypt_worker+0xc0a/0xe10 drivers/net/wireguard/send.c:305
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3340
 worker_thread+0x582/0x770 kernel/workqueue.c:3421
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x149/0x290 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: wg-crypt-wg0 wg_packet_encrypt_worker
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