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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff86860a20 of 4 bytes by task 8087 on cpu 1:
 alloc_pid+0x539/0x720 kernel/pid.c:281
 copy_process+0xe0e/0x1fe0 kernel/fork.c:2185
 kernel_clone+0x16c/0x5b0 kernel/fork.c:2599
 __do_sys_clone3 kernel/fork.c:2903 [inline]
 __se_sys_clone3+0x1c2/0x200 kernel/fork.c:2882
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:2882
 x64_sys_call+0x10c9/0x2fb0 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 0xffffffff86860a20 of 4 bytes by task 2 on cpu 0:
 copy_process+0x148f/0x1fe0 kernel/fork.c:2342
 kernel_clone+0x16c/0x5b0 kernel/fork.c:2599
 kernel_thread+0xac/0xe0 kernel/fork.c:2661
 create_kthread kernel/kthread.c:487 [inline]
 kthreadd+0x28d/0x360 kernel/kthread.c:847
 ret_from_fork+0xda/0x150 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x800000d7 -> 0x800000d8

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 2 Comm: kthreadd Not tainted 6.15.0-syzkaller-12426-ge271ed52b344 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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