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BUG: KCSAN: data-race in copy_process / free_pid

read-write to 0xffffffff85a544f8 of 4 bytes by task 6473 on cpu 1:
 free_pid+0x80/0x170 kernel/pid.c:136
 copy_process+0x1b19/0x2180 kernel/fork.c:2755
 kernel_clone+0x169/0x560 kernel/fork.c:2915
 __do_sys_clone kernel/fork.c:3058 [inline]
 __se_sys_clone kernel/fork.c:3042 [inline]
 __x64_sys_clone+0xe8/0x120 kernel/fork.c:3042
 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 2 on cpu 0:
 copy_process+0x1738/0x2180 kernel/fork.c:2659
 kernel_clone+0x169/0x560 kernel/fork.c:2915
 kernel_thread+0xb4/0xe0 kernel/fork.c:2977
 create_kthread kernel/kthread.c:402 [inline]
 kthreadd+0x28a/0x330 kernel/kthread.c:737
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

value changed: 0x8000013c -> 0x8000013b

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2 Comm: kthreadd Not tainted 6.4.0-rc5-syzkaller-00305-g022ce8862dff #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
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