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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff86a60008 of 4 bytes by task 7651 on cpu 1:
 alloc_pid+0x54c/0x760 kernel/pid.c:281
 copy_process+0xdd2/0x1f10 kernel/fork.c:2237
 kernel_clone+0x16b/0x5b0 kernel/fork.c:2651
 __do_sys_clone3 kernel/fork.c:2953 [inline]
 __se_sys_clone3+0x1f5/0x230 kernel/fork.c:2932
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:2932
 x64_sys_call+0x2c0f/0x3000 arch/x86/include/generated/asm/syscalls_64.h:436
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc0/0x2a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff86a60008 of 4 bytes by task 7650 on cpu 0:
 copy_process+0x16e4/0x1f10 kernel/fork.c:2394
 kernel_clone+0x16b/0x5b0 kernel/fork.c:2651
 __do_sys_clone kernel/fork.c:2792 [inline]
 __se_sys_clone kernel/fork.c:2776 [inline]
 __x64_sys_clone+0x143/0x180 kernel/fork.c:2776
 x64_sys_call+0x12d0/0x3000 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc0/0x2a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x8000012b -> 0x8000012c

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 7650 Comm: dhcpcd-run-hook Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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