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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff8665d878 of 4 bytes by task 3288 on cpu 1:
 alloc_pid+0x542/0x6f0 kernel/pid.c:284
 copy_process+0xe72/0x1f90 kernel/fork.c:2391
 kernel_clone+0x167/0x5e0 kernel/fork.c:2787
 user_mode_thread+0x7d/0xb0 kernel/fork.c:2865
 call_usermodehelper_exec_work+0x41/0x150 kernel/umh.c:172
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3310
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3391
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffffffff8665d878 of 4 bytes by task 11 on cpu 0:
 copy_process+0x1799/0x1f90 kernel/fork.c:2530
 kernel_clone+0x167/0x5e0 kernel/fork.c:2787
 user_mode_thread+0x7d/0xb0 kernel/fork.c:2865
 call_usermodehelper_exec_sync kernel/umh.c:133 [inline]
 call_usermodehelper_exec_work+0x7a/0x150 kernel/umh.c:164
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3310
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3391
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x800000b9 -> 0x800000ba

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 11 Comm: kworker/u8:0 Not tainted 6.11.0-syzkaller-08481-g88264981f208 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: events_unbound call_usermodehelper_exec_work
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