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BUG: KCSAN: data-race in copy_process / free_pid

read-write to 0xffffffff8665ee68 of 4 bytes by task 19077 on cpu 1:
 free_pid+0x83/0x180 kernel/pid.c:139
 copy_process+0x11c4/0x1f50 kernel/fork.c:2653
 kernel_clone+0x167/0x5e0 kernel/fork.c:2815
 __do_sys_clone kernel/fork.c:2958 [inline]
 __se_sys_clone kernel/fork.c:2942 [inline]
 __x64_sys_clone+0xe7/0x120 kernel/fork.c:2942
 x64_sys_call+0x2d7e/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff8665ee68 of 4 bytes by task 38 on cpu 0:
 copy_process+0x1750/0x1f50 kernel/fork.c:2558
 kernel_clone+0x167/0x5e0 kernel/fork.c:2815
 user_mode_thread+0x7d/0xb0 kernel/fork.c:2893
 call_usermodehelper_exec_sync kernel/umh.c:132 [inline]
 call_usermodehelper_exec_work+0x7a/0x150 kernel/umh.c:163
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0x4db/0xa20 kernel/workqueue.c:3317
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3398
 kthread+0x4ae/0x520 kernel/kthread.c:464
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x8000011c -> 0x8000011b

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 38 Comm: kworker/u8:2 Tainted: G        W          6.14.0-rc4-syzkaller #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_unbound call_usermodehelper_exec_work
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