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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff8685f028 of 4 bytes by task 32515 on cpu 0:
 alloc_pid+0x566/0x760 kernel/pid.c:280
 copy_process+0xe1a/0x1f60 kernel/fork.c:2445
 kernel_clone+0x168/0x5d0 kernel/fork.c:2844
 __do_sys_clone3 kernel/fork.c:3148 [inline]
 __se_sys_clone3+0x1c6/0x200 kernel/fork.c:3127
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3127
 x64_sys_call+0x11e9/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:436
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff8685f028 of 4 bytes by task 2 on cpu 1:
 copy_process+0x1754/0x1f60 kernel/fork.c:2587
 kernel_clone+0x168/0x5d0 kernel/fork.c:2844
 kernel_thread+0xbf/0xf0 kernel/fork.c:2906
 create_kthread kernel/kthread.c:487 [inline]
 kthreadd+0x29f/0x370 kernel/kthread.c:847
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x80000123 -> 0x80000124

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 2 Comm: kthreadd Not tainted 6.15.0-rc2-syzkaller-00488-g6fea5fabd332 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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