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BUG: KCSAN: data-race in copy_process / free_pid

read-write to 0xffffffff8605c618 of 4 bytes by task 6793 on cpu 1:
 free_pid+0x80/0x170 kernel/pid.c:143
 copy_process+0x19c5/0x1f80 kernel/fork.c:2636
 kernel_clone+0x16a/0x570 kernel/fork.c:2796
 __do_sys_clone3 kernel/fork.c:3097 [inline]
 __se_sys_clone3+0x1b5/0x1f0 kernel/fork.c:3081
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3081
 x64_sys_call+0x1538/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:436
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff8605c618 of 4 bytes by task 5691 on cpu 0:
 copy_process+0x15d8/0x1f80 kernel/fork.c:2542
 kernel_clone+0x16a/0x570 kernel/fork.c:2796
 __do_sys_clone kernel/fork.c:2939 [inline]
 __se_sys_clone kernel/fork.c:2923 [inline]
 __x64_sys_clone+0xe8/0x120 kernel/fork.c:2923
 x64_sys_call+0x23cb/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x80000214 -> 0x80000213

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 5691 Comm: dhcpcd-run-hook Not tainted 6.9.0-rc3-syzkaller-00208-g586b5dfb51b9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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