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

read-write to 0xffffffff868609c0 of 4 bytes by task 8045 on cpu 1:
 alloc_pid+0x539/0x720 kernel/pid.c:281
 copy_process+0xe0e/0x1fe0 kernel/fork.c:2445
 kernel_clone+0x16c/0x5b0 kernel/fork.c:2859
 user_mode_thread+0x7d/0xb0 kernel/fork.c:2937
 call_usermodehelper_exec_work+0x41/0x160 kernel/umh.c:171
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x4cb/0x9d0 kernel/workqueue.c:3321
 worker_thread+0x582/0x770 kernel/workqueue.c:3402
 kthread+0x489/0x510 kernel/kthread.c:464
 ret_from_fork+0xda/0x150 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffffffff868609c0 of 4 bytes by task 8030 on cpu 0:
 copy_process+0x148f/0x1fe0 kernel/fork.c:2602
 kernel_clone+0x16c/0x5b0 kernel/fork.c:2859
 user_mode_thread+0x7d/0xb0 kernel/fork.c:2937
 call_usermodehelper_exec_work+0x41/0x160 kernel/umh.c:171
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x4cb/0x9d0 kernel/workqueue.c:3321
 worker_thread+0x582/0x770 kernel/workqueue.c:3402
 kthread+0x489/0x510 kernel/kthread.c:464
 ret_from_fork+0xda/0x150 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x80000137 -> 0x80000138

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 8030 Comm: kworker/u8:50 Not tainted 6.15.0-syzkaller-09161-g0f70f5b08a47 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: events_unbound call_usermodehelper_exec_work
==================================================================