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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff86c5c3a8 of 4 bytes by task 14901 on cpu 1:
 alloc_pid+0x6ca/0x950 kernel/pid.c:332
 copy_process+0x11a2/0x23a0 kernel/fork.c:2278
 kernel_clone+0x1a5/0x5e0 kernel/fork.c:2723
 __do_sys_clone3 kernel/fork.c:3027 [inline]
 __se_sys_clone3+0x1f5/0x230 kernel/fork.c:3006
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3006
 x64_sys_call+0x580/0x3020 arch/x86/include/generated/asm/syscalls_64.h:436
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff86c5c3a8 of 4 bytes by task 2 on cpu 0:
 copy_process+0x1b1d/0x23a0 kernel/fork.c:2444
 kernel_clone+0x1a5/0x5e0 kernel/fork.c:2723
 kernel_thread+0xe5/0x120 kernel/fork.c:2784
 create_kthread kernel/kthread.c:459 [inline]
 kthreadd+0x25b/0x320 kernel/kthread.c:817
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x80000105 -> 0x80000106

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 2 Comm: kthreadd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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