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BUG: KCSAN: data-race in insert_work / wq_worker_running

read-write to 0xffff888237c2c8e4 of 4 bytes by task 29483 on cpu 0:
 wq_worker_running+0x98/0x120 kernel/workqueue.c:1068
 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:6845
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x368/0x8d0 kernel/locking/mutex.c:747
 __mutex_lock_slowpath+0xa/0x10 kernel/locking/mutex.c:1035
 mutex_lock+0x28/0x30 kernel/locking/mutex.c:286
 nf_ct_iterate_cleanup+0x2c/0x3c0 net/netfilter/nf_conntrack_core.c:2415
 nf_ct_iterate_cleanup_net+0x8a/0xa0 net/netfilter/nf_conntrack_core.c:2437
 iterate_cleanup_work+0x66/0x120 net/netfilter/nf_nat_masquerade.c:87
 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 0xffff888237c2c8e4 of 4 bytes by task 30970 on cpu 1:
 __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
 srcu_queue_delayed_work_on kernel/rcu/srcutree.c:808 [inline]
 srcu_schedule_cbs_sdp kernel/rcu/srcutree.c:821 [inline]
 srcu_gp_end kernel/rcu/srcutree.c:889 [inline]
 srcu_advance_state kernel/rcu/srcutree.c:1671 [inline]
 process_srcu+0x710/0xae0 kernel/rcu/srcutree.c:1769
 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: 1 PID: 30970 Comm: kworker/1:14 Not tainted 6.5.0-rc3-syzkaller-00275-gffabf7c73176 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
Workqueue: rcu_gp process_srcu
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