==================================================================
BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff8685fc48 of 4 bytes by task 1369 on cpu 0:
 alloc_pid+0x539/0x720 kernel/pid.c:281
 copy_process+0xe25/0x2000 kernel/fork.c:2188
 kernel_clone+0x16c/0x5c0 kernel/fork.c:2602
 user_mode_thread+0x7d/0xb0 kernel/fork.c:2680
 call_usermodehelper_exec_work+0x41/0x160 kernel/umh.c:171
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3319
 worker_thread+0x582/0x770 kernel/workqueue.c:3400
 kthread+0x486/0x510 kernel/kthread.c:463
 ret_from_fork+0xdd/0x150 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffffffff8685fc48 of 4 bytes by task 13250 on cpu 1:
 copy_process+0x14a6/0x2000 kernel/fork.c:2345
 kernel_clone+0x16c/0x5c0 kernel/fork.c:2602
 user_mode_thread+0x7d/0xb0 kernel/fork.c:2680
 call_usermodehelper_exec_work+0x41/0x160 kernel/umh.c:171
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3319
 worker_thread+0x582/0x770 kernel/workqueue.c:3400
 kthread+0x486/0x510 kernel/kthread.c:463
 ret_from_fork+0xdd/0x150 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x80000165 -> 0x80000166

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 13250 Comm: kworker/u8:65 Tainted: G        W           6.16.0-syzkaller-11699-g7e161a991ea7 #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: events_unbound call_usermodehelper_exec_work
==================================================================