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BUG: KCSAN: data-race in kick_pool / wq_worker_running

read-write to 0xffff888237c2a8a4 of 4 bytes by task 3413 on cpu 0:
 wq_worker_running+0x9b/0x120 kernel/workqueue.c:1419
 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:7065
 __mutex_lock_common kernel/locking/mutex.c:692 [inline]
 __mutex_lock+0x502/0xed0 kernel/locking/mutex.c:776
 __mutex_lock_slowpath+0xa/0x10 kernel/locking/mutex.c:1065
 mutex_lock+0x88/0x90 kernel/locking/mutex.c:290
 anon_pipe_write+0x7f/0xb30 fs/pipe.c:458
 __kernel_write_iter+0x319/0x590 fs/read_write.c:621
 __kernel_write fs/read_write.c:641 [inline]
 kernel_write+0x1f6/0x410 fs/read_write.c:662
 p9_fd_write net/9p/trans_fd.c:398 [inline]
 p9_write_work+0x312/0x720 net/9p/trans_fd.c:449
 process_one_work kernel/workqueue.c:3276 [inline]
 process_scheduled_works+0x513/0xa10 kernel/workqueue.c:3359
 worker_thread+0x58a/0x780 kernel/workqueue.c:3440
 kthread+0x22a/0x280 kernel/kthread.c:436
 ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff888237c2a8a4 of 4 bytes by task 35 on cpu 1:
 need_more_worker kernel/workqueue.c:937 [inline]
 kick_pool+0x49/0x2d0 kernel/workqueue.c:1259
 __queue_work+0x896/0xaf0 kernel/workqueue.c:2355
 queue_work_on+0xa9/0x140 kernel/workqueue.c:2405
 srcu_queue_delayed_work_on kernel/rcu/srcutree.c:873 [inline]
 srcu_schedule_cbs_sdp kernel/rcu/srcutree.c:886 [inline]
 srcu_gp_end kernel/rcu/srcutree.c:953 [inline]
 srcu_advance_state kernel/rcu/srcutree.c:1869 [inline]
 process_srcu+0xa56/0xdc0 kernel/rcu/srcutree.c:1973
 process_one_work kernel/workqueue.c:3276 [inline]
 process_scheduled_works+0x513/0xa10 kernel/workqueue.c:3359
 worker_thread+0x58a/0x780 kernel/workqueue.c:3440
 kthread+0x22a/0x280 kernel/kthread.c:436
 ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 35 Comm: kworker/1:1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: rcu_gp process_srcu
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