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BUG: KCSAN: data-race in copy_process / free_pid

read-write to 0xffffffff85a57c88 of 4 bytes by task 31257 on cpu 0:
 free_pid+0x80/0x170 kernel/pid.c:139
 copy_process+0x1aed/0x20a0 kernel/fork.c:2747
 kernel_clone+0x169/0x560 kernel/fork.c:2907
 __do_sys_clone3 kernel/fork.c:3208 [inline]
 __se_sys_clone3+0x1b5/0x1f0 kernel/fork.c:3192
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3192
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffffffff85a57c88 of 4 bytes by task 2 on cpu 1:
 copy_process+0x1700/0x20a0 kernel/fork.c:2653
 kernel_clone+0x169/0x560 kernel/fork.c:2907
 kernel_thread+0xb4/0xe0 kernel/fork.c:2969
 create_kthread kernel/kthread.c:411 [inline]
 kthreadd+0x28a/0x330 kernel/kthread.c:764
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

value changed: 0x800003f2 -> 0x800003f1

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2 Comm: kthreadd Not tainted 6.7.0-rc3-syzkaller-00298-g1b8af6552cb7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
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