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BUG: KCSAN: data-race in copy_process / free_pid

read-write to 0xffffffff86860860 of 4 bytes by task 18094 on cpu 0:
 free_pid+0x77/0x180 kernel/pid.c:126
 free_pids+0x7a/0xb0 kernel/pid.c:159
 release_task+0x9a9/0xb60 kernel/exit.c:295
 exit_notify kernel/exit.c:782 [inline]
 do_exit+0xd85/0x1590 kernel/exit.c:975
 kthread_exit+0x94/0x190 kernel/kthread.c:337
 kthread+0xc7/0x510 kernel/kthread.c:430
 ret_from_fork+0xdd/0x150 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffffffff86860860 of 4 bytes by task 2 on cpu 1:
 copy_process+0x148f/0x1fe0 kernel/fork.c:2342
 kernel_clone+0x16c/0x5b0 kernel/fork.c:2599
 kernel_thread+0xac/0xe0 kernel/fork.c:2661
 create_kthread kernel/kthread.c:487 [inline]
 kthreadd+0x28d/0x360 kernel/kthread.c:847
 ret_from_fork+0xdd/0x150 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x8000014c -> 0x8000014b

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 2 Comm: kthreadd Not tainted 6.16.0-rc2-syzkaller-00082-gfb4d33ab452e #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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