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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff8685fc48 of 4 bytes by task 3303 on cpu 1:
 alloc_pid+0x539/0x720 kernel/pid.c:282
 copy_process+0xe25/0x2000 kernel/fork.c:2196
 kernel_clone+0x16c/0x5c0 kernel/fork.c:2610
 __do_sys_clone kernel/fork.c:2753 [inline]
 __se_sys_clone kernel/fork.c:2737 [inline]
 __x64_sys_clone+0xe6/0x120 kernel/fork.c:2737
 x64_sys_call+0x119c/0x3000 arch/x86/include/generated/asm/syscalls_64.h:57
 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 0xffffffff8685fc48 of 4 bytes by task 12 on cpu 0:
 copy_process+0x17fc/0x2000 kernel/fork.c:2353
 kernel_clone+0x16c/0x5c0 kernel/fork.c:2610
 user_mode_thread+0x7d/0xb0 kernel/fork.c:2688
 call_usermodehelper_exec_sync kernel/umh.c:132 [inline]
 call_usermodehelper_exec_work+0x7a/0x160 kernel/umh.c:163
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0x4cb/0x9d0 kernel/workqueue.c:3346
 worker_thread+0x582/0x770 kernel/workqueue.c:3427
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x11f/0x1b0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x80000135 -> 0x80000136

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 12 Comm: kworker/u8:0 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: events_unbound call_usermodehelper_exec_work
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