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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff8685ffc8 of 4 bytes by task 4993 on cpu 1:
 alloc_pid+0x54c/0x760 kernel/pid.c:281
 copy_process+0xdd1/0x1ef0 kernel/fork.c:2194
 kernel_clone+0x16c/0x5c0 kernel/fork.c:2608
 __do_sys_clone3 kernel/fork.c:2910 [inline]
 __se_sys_clone3+0x1c2/0x200 kernel/fork.c:2889
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:2889
 x64_sys_call+0x2c0f/0x3000 arch/x86/include/generated/asm/syscalls_64.h:436
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd8/0x2a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff8685ffc8 of 4 bytes by task 53 on cpu 0:
 copy_process+0x16d4/0x1ef0 kernel/fork.c:2351
 kernel_clone+0x16c/0x5c0 kernel/fork.c:2608
 user_mode_thread+0x7d/0xb0 kernel/fork.c:2684
 call_usermodehelper_exec_work+0x41/0x160 kernel/umh.c:171
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3340
 worker_thread+0x582/0x770 kernel/workqueue.c:3421
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x149/0x290 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

value changed: 0x80000123 -> 0x80000124

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 53 Comm: kworker/u8:4 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events_unbound call_usermodehelper_exec_work
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