==================================================================
BUG: KCSAN: data-race in kick_pool_pick / wq_worker_running

read-write to 0xffff888237c2b0a4 of 4 bytes by task 5135 on cpu 0:
 wq_worker_running+0x9c/0x120 kernel/workqueue.c:1465
 synchronize_rcu_expedited+0x5f8/0x770 kernel/rcu/tree_exp.h:981
 synchronize_rcu+0x35/0x2e0 kernel/rcu/tree.c:3411
 srcu_readers_active_idx_check kernel/rcu/srcutree.c:540 [inline]
 try_check_zero+0x17a/0x260 kernel/rcu/srcutree.c:1135
 srcu_advance_state kernel/rcu/srcutree.c:1827 [inline]
 process_srcu+0xc6/0xd90 kernel/rcu/srcutree.c:1954
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0x56a/0xa50 kernel/workqueue.c:3479
 worker_thread+0x569/0x750 kernel/workqueue.c:3560
 kthread+0x223/0x270 kernel/kthread.c:436
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff888237c2b0a4 of 4 bytes by task 17333 on cpu 1:
 need_more_worker kernel/workqueue.c:954 [inline]
 kick_pool_pick+0x5f/0x310 kernel/workqueue.c:1284
 __queue_work+0x90a/0xbc0 kernel/workqueue.c:2449
 queue_work_on+0xa9/0x140 kernel/workqueue.c:2501
 srcu_queue_delayed_work_on kernel/rcu/srcutree.c:854 [inline]
 srcu_schedule_cbs_sdp kernel/rcu/srcutree.c:867 [inline]
 srcu_gp_end kernel/rcu/srcutree.c:932 [inline]
 srcu_advance_state kernel/rcu/srcutree.c:1850 [inline]
 process_srcu+0xa39/0xd90 kernel/rcu/srcutree.c:1954
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0x56a/0xa50 kernel/workqueue.c:3479
 worker_thread+0x569/0x750 kernel/workqueue.c:3560
 kthread+0x223/0x270 kernel/kthread.c:436
 ret_from_fork+0x146/0x330 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: 17333 Comm: kworker/1:12 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: rcu_gp process_srcu
==================================================================