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BUG: KCSAN: data-race in copy_process / free_pid

read-write to 0xffffffff85c59638 of 4 bytes by task 609 on cpu 1:
 free_pid+0x80/0x170 kernel/pid.c:139
 copy_process+0x1aed/0x20a0 kernel/fork.c:2742
 kernel_clone+0x169/0x560 kernel/fork.c:2902
 __do_sys_clone3 kernel/fork.c:3203 [inline]
 __se_sys_clone3+0x1b5/0x1f0 kernel/fork.c:3187
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3187
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffffffff85c59638 of 4 bytes by task 16681 on cpu 0:
 copy_process+0x1700/0x20a0 kernel/fork.c:2648
 kernel_clone+0x169/0x560 kernel/fork.c:2902
 user_mode_thread+0x7d/0xb0 kernel/fork.c:2980
 call_usermodehelper_exec_sync kernel/umh.c:133 [inline]
 call_usermodehelper_exec_work+0x7a/0x150 kernel/umh.c:164
 process_one_work kernel/workqueue.c:2633 [inline]
 process_scheduled_works+0x5b8/0xa40 kernel/workqueue.c:2706
 worker_thread+0x525/0x730 kernel/workqueue.c:2787
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:243

value changed: 0x80000186 -> 0x80000185

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 16681 Comm: kworker/u4:18 Not tainted 6.8.0-rc7-syzkaller-00020-g5847c9777c30 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Workqueue: events_unbound call_usermodehelper_exec_work
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