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BUG: KCSAN: data-race in insert_work / wq_worker_running

read-write to 0xffff888237d2c8e4 of 4 bytes by task 9958 on cpu 1:
 wq_worker_running+0x98/0x120 kernel/workqueue.c:1068
 schedule_timeout+0x55/0x230 kernel/time/timer.c:2143
 do_wait_for_common kernel/sched/completion.c:85 [inline]
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common+0xfa/0x1b0 kernel/sched/completion.c:117
 rcu_barrier+0x422/0x530 kernel/rcu/tree.c:4065
 fqdir_free_fn+0x1e/0xe0 net/ipv4/inet_fragment.c:164
 process_one_work+0x434/0x860 kernel/workqueue.c:2597
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2748
 kthread+0x1d7/0x210 kernel/kthread.c:389
 ret_from_fork+0x2e/0x40 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296

read to 0xffff888237d2c8e4 of 4 bytes by task 9943 on cpu 0:
 __need_more_worker kernel/workqueue.c:827 [inline]
 insert_work+0x10e/0x190 kernel/workqueue.c:1560
 __queue_work+0x722/0x980 kernel/workqueue.c:1714
 queue_work_on+0x95/0xf0 kernel/workqueue.c:1744
 wg_queue_enqueue_per_peer_tx+0x127/0x270 drivers/net/wireguard/queueing.h:188
 wg_packet_encrypt_worker+0x885/0xa30 drivers/net/wireguard/send.c:305
 process_one_work+0x434/0x860 kernel/workqueue.c:2597
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2748
 kthread+0x1d7/0x210 kernel/kthread.c:389
 ret_from_fork+0x2e/0x40 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 9943 Comm: kworker/0:4 Not tainted 6.5.0-rc3-syzkaller-00024-g18b44bc5a672 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
Workqueue: wg-crypt-wg0 wg_packet_encrypt_worker
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