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BUG: KCSAN: data-race in copy_process / free_pid

read-write to 0xffffffff8665d8f8 of 4 bytes by task 29259 on cpu 1:
 free_pid+0x80/0x170 kernel/pid.c:143
 copy_process+0x19d0/0x1f90 kernel/fork.c:2621
 kernel_clone+0x167/0x5e0 kernel/fork.c:2781
 __do_sys_clone3 kernel/fork.c:3085 [inline]
 __se_sys_clone3+0x1b5/0x1f0 kernel/fork.c:3064
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3064
 x64_sys_call+0x287d/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:436
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff8665d8f8 of 4 bytes by task 2 on cpu 0:
 copy_process+0x15e3/0x1f90 kernel/fork.c:2527
 kernel_clone+0x167/0x5e0 kernel/fork.c:2781
 kernel_thread+0xb4/0xf0 kernel/fork.c:2843
 create_kthread kernel/kthread.c:412 [inline]
 kthreadd+0x28b/0x330 kernel/kthread.c:765
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x80000210 -> 0x8000020f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 2 Comm: kthreadd Not tainted 6.11.0-rc7-syzkaller-00097-g196145c606d0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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