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BUG: KCSAN: data-race in kick_pool / wq_worker_running

read-write to 0xffff888237d2a8a4 of 4 bytes by task 6644 on cpu 1:
 wq_worker_running+0x9b/0x120 kernel/workqueue.c:1419
 synchronize_rcu_expedited+0x5f8/0x770 kernel/rcu/tree_exp.h:976
 synchronize_rcu+0x35/0x2e0 kernel/rcu/tree.c:3360
 key_garbage_collector+0x786/0x900 security/keys/gc.c:297
 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 0xffff888237d2a8a4 of 4 bytes by task 31688 on cpu 0:
 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
 __lru_add_drain_all+0x319/0x450 mm/swap.c:879
 lru_cache_disable+0x1f/0x30 mm/swap.c:930
 do_mbind mm/mempolicy.c:1531 [inline]
 kernel_mbind mm/mempolicy.c:1757 [inline]
 __do_sys_mbind mm/mempolicy.c:1831 [inline]
 __se_sys_mbind+0x6cb/0xdd0 mm/mempolicy.c:1827
 __x64_sys_mbind+0x78/0x90 mm/mempolicy.c:1827
 x64_sys_call+0x2b72/0x3020 arch/x86/include/generated/asm/syscalls_64.h:238
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 31688 Comm: syz.7.8421 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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