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BUG: KCSAN: data-race in kick_pool / wq_worker_running

read-write to 0xffff888237c2a8a4 of 4 bytes by task 6296 on cpu 0:
 wq_worker_running+0x9b/0x120 kernel/workqueue.c:1419
 synchronize_rcu_expedited+0x5f8/0x770 kernel/rcu/tree_exp.h:976
 srcu_readers_active_idx_check kernel/rcu/srcutree.c:537 [inline]
 try_check_zero+0x191/0x260 kernel/rcu/srcutree.c:1156
 srcu_advance_state kernel/rcu/srcutree.c:1864 [inline]
 process_srcu+0x1ff/0xdc0 kernel/rcu/srcutree.c:1973
 process_one_work kernel/workqueue.c:3288 [inline]
 process_scheduled_works+0x513/0xa10 kernel/workqueue.c:3371
 worker_thread+0x58a/0x780 kernel/workqueue.c:3452
 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 6308 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:2367
 queue_work_on+0xa9/0x140 kernel/workqueue.c:2417
 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:3288 [inline]
 process_scheduled_works+0x513/0xa10 kernel/workqueue.c:3371
 worker_thread+0x58a/0x780 kernel/workqueue.c:3452
 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: 6308 Comm: kworker/1:10 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: rcu_gp process_srcu
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