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BUG: KCSAN: data-race in copy_process / free_pid

read-write to 0xffffffff85a53928 of 4 bytes by task 5162 on cpu 1:
 free_pid+0x71/0x180 kernel/pid.c:136
 copy_process+0x18fc/0x20b0 kernel/fork.c:2491
 kernel_clone+0x163/0x5c0 kernel/fork.c:2655
 __do_sys_clone kernel/fork.c:2789 [inline]
 __se_sys_clone kernel/fork.c:2773 [inline]
 __x64_sys_clone+0xc3/0xf0 kernel/fork.c:2773
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffffffff85a53928 of 4 bytes by task 1808 on cpu 0:
 copy_process+0x1503/0x20b0 kernel/fork.c:2405
 kernel_clone+0x163/0x5c0 kernel/fork.c:2655
 user_mode_thread+0x6c/0xa0 kernel/fork.c:2724
 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: 0x800001a2 -> 0x800001a1

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1808 Comm: kworker/u4:14 Not tainted 5.19.0-rc7-syzkaller-00005-gca85855bdcae-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
Workqueue: events_unbound call_usermodehelper_exec_work
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