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BUG: KCSAN: data-race in copy_process / free_pid

read-write to 0xffffffff85c53358 of 4 bytes by task 8717 on cpu 0:
 free_pid+0x71/0x180 kernel/pid.c:136
 copy_process+0x197f/0x2140 kernel/fork.c:2509
 kernel_clone+0x163/0x5c0 kernel/fork.c:2673
 __do_sys_clone kernel/fork.c:2807 [inline]
 __se_sys_clone kernel/fork.c:2791 [inline]
 __x64_sys_clone+0xc3/0xf0 kernel/fork.c:2791
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffffffff85c53358 of 4 bytes by task 2 on cpu 1:
 copy_process+0x1583/0x2140 kernel/fork.c:2423
 kernel_clone+0x163/0x5c0 kernel/fork.c:2673
 kernel_thread+0x74/0xa0 kernel/fork.c:2726
 create_kthread kernel/kthread.c:399 [inline]
 kthreadd+0x296/0x340 kernel/kthread.c:745
 ret_from_fork+0x1f/0x30

value changed: 0x800000e8 -> 0x800000e7

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2 Comm: kthreadd Not tainted 6.0.0-rc4-syzkaller-00204-g9b4509495418-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
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