syzbot

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BUG: KCSAN: data-race in kick_pool / wq_worker_running

read-write to 0xffff888237d2a8a4 of 4 bytes by task 3401 on cpu 1:
 wq_worker_running+0x9b/0x120 kernel/workqueue.c:1419
 synchronize_rcu_expedited+0x5f8/0x770 kernel/rcu/tree_exp.h:976
 synchronize_rcu+0x35/0x2e0 kernel/rcu/tree.c:3360
 srcu_readers_active_idx_check kernel/rcu/srcutree.c:569 [inline]
 try_check_zero+0x182/0x260 kernel/rcu/srcutree.c:1180
 srcu_advance_state kernel/rcu/srcutree.c:1888 [inline]
 process_srcu+0x1ff/0xdc0 kernel/rcu/srcutree.c:1997
 process_one_work kernel/workqueue.c:3276 [inline]
 process_scheduled_works+0x513/0xa10 kernel/workqueue.c:3359
 worker_thread+0x58a/0x780 kernel/workqueue.c:3440
 kthread+0x22a/0x280 kernel/kthread.c:436
 ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff888237d2a8a4 of 4 bytes by task 16238 on cpu 0:
 need_more_worker kernel/workqueue.c:937 [inline]
 kick_pool+0x49/0x2d0 kernel/workqueue.c:1259
 __queue_work+0x896/0xaf0 kernel/workqueue.c:2355
 queue_work_on+0xa9/0x140 kernel/workqueue.c:2405
 wg_queue_enqueue_per_peer_tx drivers/net/wireguard/queueing.h:183 [inline]
 wg_packet_encrypt_worker+0xbdd/0xde0 drivers/net/wireguard/send.c:305
 process_one_work kernel/workqueue.c:3276 [inline]
 process_scheduled_works+0x513/0xa10 kernel/workqueue.c:3359
 worker_thread+0x58a/0x780 kernel/workqueue.c:3440
 kthread+0x22a/0x280 kernel/kthread.c:436
 ret_from_fork+0x150/0x360 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: 16238 Comm: kworker/0:4 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: wg-crypt-wg0 wg_packet_encrypt_worker
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