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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff86e5b7e8 of 4 bytes by task 3862 on cpu 0:
 alloc_pid+0x6da/0x960 kernel/pid.c:334
 copy_process+0x14c3/0x2400 kernel/fork.c:2336
 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2790
 user_mode_thread+0xab/0xe0 kernel/fork.c:2867
 call_usermodehelper_exec_sync kernel/umh.c:130 [inline]
 call_usermodehelper_exec_work+0x7a/0x160 kernel/umh.c:161
 process_one_work kernel/workqueue.c:3495 [inline]
 process_scheduled_works+0x53f/0xa20 kernel/workqueue.c:3578
 worker_thread+0x56c/0x770 kernel/workqueue.c:3659
 kthread+0x223/0x270 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 0xffffffff86e5b7e8 of 4 bytes by task 3876 on cpu 1:
 copy_process+0x1b7e/0x2400 kernel/fork.c:2499
 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2790
 user_mode_thread+0xab/0xe0 kernel/fork.c:2867
 call_usermodehelper_exec_sync kernel/umh.c:130 [inline]
 call_usermodehelper_exec_work+0x7a/0x160 kernel/umh.c:161
 process_one_work kernel/workqueue.c:3495 [inline]
 process_scheduled_works+0x53f/0xa20 kernel/workqueue.c:3578
 worker_thread+0x56c/0x770 kernel/workqueue.c:3659
 kthread+0x223/0x270 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: 0x8000013b -> 0x8000013c

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3876 Comm: kworker/u8:15 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Workqueue: events_unbound call_usermodehelper_exec_work
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