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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff8665ef28 of 4 bytes by task 4264 on cpu 0:
 alloc_pid+0x55c/0x750 kernel/pid.c:282
 copy_process+0xe1d/0x1f50 kernel/fork.c:2419
 kernel_clone+0x167/0x5e0 kernel/fork.c:2815
 __do_sys_clone kernel/fork.c:2958 [inline]
 __se_sys_clone kernel/fork.c:2942 [inline]
 __x64_sys_clone+0xe7/0x120 kernel/fork.c:2942
 x64_sys_call+0x2d7e/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff8665ef28 of 4 bytes by task 2 on cpu 1:
 copy_process+0x1750/0x1f50 kernel/fork.c:2558
 kernel_clone+0x167/0x5e0 kernel/fork.c:2815
 kernel_thread+0xbc/0xf0 kernel/fork.c:2877
 create_kthread kernel/kthread.c:487 [inline]
 kthreadd+0x28b/0x330 kernel/kthread.c:847
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x800000b3 -> 0x800000b4

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 2 Comm: kthreadd Not tainted 6.14.0-rc6-syzkaller-00007-g0b46b049d6ec #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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