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BUG: KCSAN: data-race in copy_process / free_pid

read-write to 0xffffffff8665d858 of 4 bytes by task 15235 on cpu 0:
 free_pid+0x80/0x170 kernel/pid.c:143
 copy_process+0x1213/0x1f90 kernel/fork.c:2622
 kernel_clone+0x167/0x5e0 kernel/fork.c:2784
 __do_sys_clone3 kernel/fork.c:3088 [inline]
 __se_sys_clone3+0x1b5/0x1f0 kernel/fork.c:3067
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3067
 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 0xffffffff8665d858 of 4 bytes by task 15389 on cpu 1:
 copy_process+0x1799/0x1f90 kernel/fork.c:2527
 kernel_clone+0x167/0x5e0 kernel/fork.c:2784
 __do_sys_clone kernel/fork.c:2927 [inline]
 __se_sys_clone kernel/fork.c:2911 [inline]
 __x64_sys_clone+0xe8/0x120 kernel/fork.c:2911
 x64_sys_call+0x2d23/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:57
 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

value changed: 0x80000220 -> 0x8000021f

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 15389 Comm: dhcpcd-run-hook Not tainted 6.12.0-rc3-syzkaller-00183-g6efbea77b390 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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