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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff86a61ee8 of 4 bytes by task 6572 on cpu 0:
 alloc_pid+0x62c/0x8e0 kernel/pid.c:323
 copy_process+0xf37/0x20c0 kernel/fork.c:2239
 kernel_clone+0x16b/0x5b0 kernel/fork.c:2654
 user_mode_thread+0x9c/0xd0 kernel/fork.c:2730
 call_usermodehelper_exec_work+0x41/0x160 kernel/umh.c:171
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0x4cd/0x9d0 kernel/workqueue.c:3340
 worker_thread+0x6bc/0x8b0 kernel/workqueue.c:3421
 kthread+0x22a/0x280 kernel/kthread.c:467
 ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffffffff86a61ee8 of 4 bytes by task 11605 on cpu 1:
 copy_process+0x1895/0x20c0 kernel/fork.c:2396
 kernel_clone+0x16b/0x5b0 kernel/fork.c:2654
 user_mode_thread+0x9c/0xd0 kernel/fork.c:2730
 call_usermodehelper_exec_work+0x41/0x160 kernel/umh.c:171
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0x4cd/0x9d0 kernel/workqueue.c:3340
 worker_thread+0x6bc/0x8b0 kernel/workqueue.c:3421
 kthread+0x22a/0x280 kernel/kthread.c:467
 ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x800001a1 -> 0x800001a2

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 11605 Comm: kworker/u8:29 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Workqueue: events_unbound call_usermodehelper_exec_work
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