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BUG: KCSAN: data-race in copy_process / free_pid

read-write to 0xffffffff85c53358 of 4 bytes by task 1136 on cpu 1:
 free_pid+0x71/0x180 kernel/pid.c:136
 copy_process+0x197f/0x2140 kernel/fork.c:2509
 create_io_thread+0x6d/0xa0 kernel/fork.c:2621
 create_worker_cont+0x5b/0x360 io_uring/io-wq.c:754
 task_work_run+0x8e/0x110 kernel/task_work.c:177
 get_signal+0xeca/0x1020 kernel/signal.c:2634
 arch_do_signal_or_restart+0x87/0x2d0 arch/x86/kernel/signal.c:869
 exit_to_user_mode_loop+0x78/0x130 kernel/entry/common.c:166
 exit_to_user_mode_prepare kernel/entry/common.c:201 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:294
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffffffff85c53358 of 4 bytes by task 1864 on cpu 0:
 copy_process+0x1583/0x2140 kernel/fork.c:2423
 kernel_clone+0x163/0x5c0 kernel/fork.c:2673
 user_mode_thread+0x6c/0xa0 kernel/fork.c:2742
 call_usermodehelper_exec_sync kernel/umh.c:135 [inline]
 call_usermodehelper_exec_work+0x76/0x150 kernel/umh.c:166
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

value changed: 0x80000134 -> 0x80000133

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1864 Comm: kworker/u4:6 Tainted: G        W          5.19.0-syzkaller-13930-g7ebfc85e2cd7-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Workqueue: events_unbound call_usermodehelper_exec_work
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