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BUG: KCSAN: data-race in copy_process / free_pid

read-write to 0xffffffff8685fc48 of 4 bytes by task 4876 on cpu 1:
 free_pid+0x77/0x180 kernel/pid.c:126
 free_pids+0x9e/0xb0 kernel/pid.c:159
 release_task+0x9a9/0xb60 kernel/exit.c:296
 exit_notify kernel/exit.c:778 [inline]
 do_exit+0xd81/0x15c0 kernel/exit.c:973
 do_group_exit+0xff/0x140 kernel/exit.c:1102
 get_signal+0xe59/0xf70 kernel/signal.c:3034
 arch_do_signal_or_restart+0x96/0x480 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x7a/0x100 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x1d6/0x200 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff8685fc48 of 4 bytes by task 2 on cpu 0:
 copy_process+0x14a6/0x2000 kernel/fork.c:2348
 kernel_clone+0x16c/0x5c0 kernel/fork.c:2605
 kernel_thread+0xac/0xe0 kernel/fork.c:2667
 create_kthread kernel/kthread.c:486 [inline]
 kthreadd+0x28d/0x360 kernel/kthread.c:846
 ret_from_fork+0xda/0x150 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x800000e0 -> 0x800000df

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 2 Comm: kthreadd Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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