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BUG: KCSAN: data-race in wg_queue_enqueue_per_peer_tx / wg_queue_enqueue_per_peer_tx

read to 0xffff8881195dba70 of 4 bytes by task 3392 on cpu 0:
 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:3238 [inline]
 process_scheduled_works+0x4cb/0x9d0 kernel/workqueue.c:3319
 worker_thread+0x582/0x770 kernel/workqueue.c:3400
 kthread+0x486/0x510 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

write to 0xffff8881195dba70 of 4 bytes by task 23 on cpu 1:
 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:3238 [inline]
 process_scheduled_works+0x4cb/0x9d0 kernel/workqueue.c:3319
 worker_thread+0x582/0x770 kernel/workqueue.c:3400
 kthread+0x486/0x510 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: 0x00000002 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 23 Comm: kworker/1:0 Not tainted 6.15.0-rc7-syzkaller-00007-g4a95bc121ccd #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: wg-crypt-wg2 wg_packet_encrypt_worker
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