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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff86a88588 of 4 bytes by task 24 on cpu 1:
 alloc_pid+0x50d/0x6b0 kernel/pid.c:275
 copy_process+0x14ec/0x2da0 kernel/fork.c:2115
 kernel_clone+0x14b/0x680 kernel/fork.c:2464
 kernel_thread+0x85/0xb0 kernel/fork.c:2516
 call_usermodehelper_exec_work+0x3d/0x150 kernel/umh.c:172
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x635/0xb90 kernel/workqueue.c:2421
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read to 0xffffffff86a88588 of 4 bytes by task 751 on cpu 0:
 copy_process+0x1bd1/0x2da0 kernel/fork.c:2247
 kernel_clone+0x14b/0x680 kernel/fork.c:2464
 kernel_thread+0x85/0xb0 kernel/fork.c:2516
 call_usermodehelper_exec_work+0x3d/0x150 kernel/umh.c:172
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x635/0xb90 kernel/workqueue.c:2421
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 751 Comm: kworker/u4:3 Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound call_usermodehelper_exec_work
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