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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff86e5c268 of 4 bytes by task 27292 on cpu 1:
 alloc_pid+0x6da/0x960 kernel/pid.c:334
 copy_process+0x11cb/0x2340 kernel/fork.c:2329
 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2772
 user_mode_thread+0xab/0xe0 kernel/fork.c:2849
 call_usermodehelper_exec_work+0x41/0x160 kernel/umh.c:169
 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+0x223/0x270 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

read to 0xffffffff86e5c268 of 4 bytes by task 1392 on cpu 0:
 copy_process+0x1acf/0x2340 kernel/fork.c:2492
 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2772
 __do_sys_clone kernel/fork.c:2914 [inline]
 __se_sys_clone kernel/fork.c:2898 [inline]
 __x64_sys_clone+0x143/0x180 kernel/fork.c:2898
 x64_sys_call+0x2479/0x2550 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x80000159 -> 0x8000015a

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 1392 Comm: dhcpcd-run-hook Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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