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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff86c5e368 of 4 bytes by task 18746 on cpu 1:
 alloc_pid+0x651/0x940 kernel/pid.c:321
 copy_process+0x11a2/0x2380 kernel/fork.c:2277
 kernel_clone+0x16b/0x5b0 kernel/fork.c:2701
 user_mode_thread+0x9c/0xd0 kernel/fork.c:2777
 call_usermodehelper_exec_work+0x41/0x160 kernel/umh.c:171
 process_one_work kernel/workqueue.c:3288 [inline]
 process_scheduled_works+0x4f0/0x9c0 kernel/workqueue.c:3371
 worker_thread+0x58a/0x780 kernel/workqueue.c:3452
 kthread+0x22a/0x280 kernel/kthread.c:436
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffffffff86c5e368 of 4 bytes by task 18740 on cpu 0:
 copy_process+0x1b1d/0x2380 kernel/fork.c:2439
 kernel_clone+0x16b/0x5b0 kernel/fork.c:2701
 user_mode_thread+0x9c/0xd0 kernel/fork.c:2777
 call_usermodehelper_exec_work+0x41/0x160 kernel/umh.c:171
 process_one_work kernel/workqueue.c:3288 [inline]
 process_scheduled_works+0x4f0/0x9c0 kernel/workqueue.c:3371
 worker_thread+0x58a/0x780 kernel/workqueue.c:3452
 kthread+0x22a/0x280 kernel/kthread.c:436
 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: 0x80000151 -> 0x80000152

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 18740 Comm: kworker/u8:2 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: events_unbound call_usermodehelper_exec_work
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