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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff86c5c268 of 4 bytes by task 20334 on cpu 0:
 alloc_pid+0x6bb/0x930 kernel/pid.c:332
 copy_process+0x11aa/0x2310 kernel/fork.c:2305
 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2748
 __do_sys_clone3 kernel/fork.c:3050 [inline]
 __se_sys_clone3+0x1f5/0x230 kernel/fork.c:3029
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3029
 x64_sys_call+0x580/0x3020 arch/x86/include/generated/asm/syscalls_64.h:436
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff86c5c268 of 4 bytes by task 8453 on cpu 1:
 copy_process+0x1aae/0x2310 kernel/fork.c:2468
 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2748
 user_mode_thread+0x9c/0xd0 kernel/fork.c:2824
 call_usermodehelper_exec_sync kernel/umh.c:132 [inline]
 call_usermodehelper_exec_work+0x7a/0x160 kernel/umh.c:163
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
 worker_thread+0x569/0x750 kernel/workqueue.c:3486
 kthread+0x221/0x270 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: 0x80000181 -> 0x80000182

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 8453 Comm: kworker/u8:79 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: events_unbound call_usermodehelper_exec_work
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