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BUG: KCSAN: data-race in insert_work / wq_worker_running

read-write to 0xffff888237c2a7e0 of 4 bytes by task 30 on cpu 0:
 wq_worker_running+0x96/0xe0 kernel/workqueue.c:880
 schedule_timeout+0x51/0x290 kernel/time/timer.c:1911
 do_wait_for_common kernel/sched/completion.c:85 [inline]
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common+0x104/0x1c0 kernel/sched/completion.c:117
 rcu_barrier+0x3f2/0x510 kernel/rcu/tree.c:4173
 fqdir_free_fn+0x1e/0x110 net/ipv4/inet_fragment.c:163
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

read to 0xffff888237c2a7e0 of 4 bytes by task 25139 on cpu 1:
 __need_more_worker kernel/workqueue.c:785 [inline]
 insert_work+0x10e/0x190 kernel/workqueue.c:1365
 __queue_work+0x69e/0x8e0 kernel/workqueue.c:1517
 queue_work_on+0x7e/0xe0 kernel/workqueue.c:1545
 srcu_queue_delayed_work_on kernel/rcu/srcutree.c:658 [inline]
 srcu_schedule_cbs_sdp kernel/rcu/srcutree.c:671 [inline]
 srcu_gp_end kernel/rcu/srcutree.c:736 [inline]
 srcu_advance_state kernel/rcu/srcutree.c:1481 [inline]
 process_srcu+0x72d/0xab0 kernel/rcu/srcutree.c:1577
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 25139 Comm: kworker/1:0 Not tainted 5.19.0-rc6-syzkaller-00026-g5a29232d870d-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
Workqueue: rcu_gp process_srcu
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