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BUG: KCSAN: data-race in copy_process / free_pid

read-write to 0xffffffff85a544f8 of 4 bytes by task 16895 on cpu 1:
 free_pid+0x80/0x170 kernel/pid.c:136
 copy_process+0x1b4e/0x21b0 kernel/fork.c:2758
 kernel_clone+0x169/0x560 kernel/fork.c:2918
 __do_sys_clone kernel/fork.c:3061 [inline]
 __se_sys_clone kernel/fork.c:3045 [inline]
 __x64_sys_clone+0xe8/0x120 kernel/fork.c:3045
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffffffff85a544f8 of 4 bytes by task 29586 on cpu 0:
 copy_process+0x176d/0x21b0 kernel/fork.c:2662
 kernel_clone+0x169/0x560 kernel/fork.c:2918
 user_mode_thread+0x7d/0xb0 kernel/fork.c:2996
 call_usermodehelper_exec_sync kernel/umh.c:133 [inline]
 call_usermodehelper_exec_work+0x7a/0x150 kernel/umh.c:164
 process_one_work+0x3e6/0x750 kernel/workqueue.c:2405
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2552
 kthread+0x1d7/0x210 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

value changed: 0x80000136 -> 0x80000135

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 29586 Comm: kworker/u4:6 Not tainted 6.4.0-rc3-syzkaller-00004-g421ca22e3138 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
Workqueue: events_unbound call_usermodehelper_exec_work
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