syzbot

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BUG: KCSAN: data-race in wg_queue_enqueue_per_peer_tx / wg_queue_enqueue_per_peer_tx

write to 0xffff88811a435430 of 4 bytes by task 9 on cpu 0:
 wg_cpumask_choose_online drivers/net/wireguard/queueing.h:115 [inline]
 wg_queue_enqueue_per_peer_tx+0x260/0x270 drivers/net/wireguard/queueing.h:188
 wg_packet_encrypt_worker+0x9e1/0xb80 drivers/net/wireguard/send.c:305
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0x4cb/0x9d0 kernel/workqueue.c:3319
 worker_thread+0x582/0x770 kernel/workqueue.c:3400
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x11f/0x1b0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff88811a435430 of 4 bytes by task 3413 on cpu 1:
 wg_cpumask_choose_online drivers/net/wireguard/queueing.h:107 [inline]
 wg_queue_enqueue_per_peer_tx+0x9c/0x270 drivers/net/wireguard/queueing.h:188
 wg_packet_encrypt_worker+0x9e1/0xb80 drivers/net/wireguard/send.c:305
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0x4cb/0x9d0 kernel/workqueue.c:3319
 worker_thread+0x582/0x770 kernel/workqueue.c:3400
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x11f/0x1b0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x00000002 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3413 Comm: kworker/1:5 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: wg-crypt-wg2 wg_packet_encrypt_worker
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