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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff8605c618 of 4 bytes by task 8924 on cpu 1:
 alloc_pid+0x542/0x6f0 kernel/pid.c:284
 copy_process+0xff8/0x1f80 kernel/fork.c:2406
 kernel_clone+0x16a/0x570 kernel/fork.c:2797
 user_mode_thread+0x7d/0xb0 kernel/fork.c:2875
 call_usermodehelper_exec_work+0x41/0x150 kernel/umh.c:172
 process_one_work kernel/workqueue.c:3254 [inline]
 process_scheduled_works+0x465/0x990 kernel/workqueue.c:3335
 worker_thread+0x526/0x730 kernel/workqueue.c:3416
 kthread+0x1d1/0x210 kernel/kthread.c:388
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffffffff8605c618 of 4 bytes by task 10 on cpu 0:
 copy_process+0x15d8/0x1f80 kernel/fork.c:2543
 kernel_clone+0x16a/0x570 kernel/fork.c:2797
 user_mode_thread+0x7d/0xb0 kernel/fork.c:2875
 call_usermodehelper_exec_work+0x41/0x150 kernel/umh.c:172
 process_one_work kernel/workqueue.c:3254 [inline]
 process_scheduled_works+0x465/0x990 kernel/workqueue.c:3335
 worker_thread+0x526/0x730 kernel/workqueue.c:3416
 kthread+0x1d1/0x210 kernel/kthread.c:388
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x800000d1 -> 0x800000d2

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10 Comm: kworker/u8:0 Not tainted 6.9.0-rc4-syzkaller-00173-g3cdb45594619 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: events_unbound call_usermodehelper_exec_work
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