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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff8685fc68 of 4 bytes by task 16946 on cpu 0:
 alloc_pid+0x539/0x720 kernel/pid.c:281
 copy_process+0xe25/0x2000 kernel/fork.c:2188
 kernel_clone+0x16c/0x5c0 kernel/fork.c:2602
 __do_sys_clone3 kernel/fork.c:2906 [inline]
 __se_sys_clone3+0x1c2/0x200 kernel/fork.c:2885
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:2885
 x64_sys_call+0x1fc9/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:436
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff8685fc68 of 4 bytes by task 2 on cpu 1:
 copy_process+0x14a6/0x2000 kernel/fork.c:2345
 kernel_clone+0x16c/0x5c0 kernel/fork.c:2602
 kernel_thread+0xac/0xe0 kernel/fork.c:2664
 create_kthread kernel/kthread.c:487 [inline]
 kthreadd+0x28d/0x360 kernel/kthread.c:847
 ret_from_fork+0xdd/0x150 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x80000101 -> 0x80000102

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 2 Comm: kthreadd Tainted: G        W           6.16.0-syzkaller-06699-ge8d780dcd957 #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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