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BUG: KCSAN: data-race in copy_process / free_pid

read-write to 0xffffffff85a57bc8 of 4 bytes by task 6744 on cpu 0:
 free_pid+0x80/0x170 kernel/pid.c:139
 copy_process+0x1b19/0x2180 kernel/fork.c:2749
 kernel_clone+0x169/0x560 kernel/fork.c:2909
 __do_sys_clone3 kernel/fork.c:3210 [inline]
 __se_sys_clone3+0x1b5/0x1f0 kernel/fork.c:3194
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3194
 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 0xffffffff85a57bc8 of 4 bytes by task 9997 on cpu 1:
 copy_process+0x1738/0x2180 kernel/fork.c:2653
 kernel_clone+0x169/0x560 kernel/fork.c:2909
 user_mode_thread+0x7d/0xb0 kernel/fork.c:2987
 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:2630 [inline]
 process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2703
 worker_thread+0x525/0x730 kernel/workqueue.c:2784
 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:304

value changed: 0x800002f8 -> 0x800002f7

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 9997 Comm: kworker/u4:17 Not tainted 6.6.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Workqueue: events_unbound call_usermodehelper_exec_work
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