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BUG: KCSAN: data-race in copy_process / free_pid

read-write to 0xffffffff85c59638 of 4 bytes by task 16866 on cpu 0:
 free_pid+0x80/0x170 kernel/pid.c:139
 copy_process+0x1aed/0x20a0 kernel/fork.c:2742
 kernel_clone+0x169/0x560 kernel/fork.c:2902
 __do_sys_clone3 kernel/fork.c:3203 [inline]
 __se_sys_clone3+0x1b5/0x1f0 kernel/fork.c:3187
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3187
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffffffff85c59638 of 4 bytes by task 3086 on cpu 1:
 copy_process+0x1700/0x20a0 kernel/fork.c:2648
 kernel_clone+0x169/0x560 kernel/fork.c:2902
 __do_sys_clone kernel/fork.c:3045 [inline]
 __se_sys_clone kernel/fork.c:3029 [inline]
 __x64_sys_clone+0xe8/0x120 kernel/fork.c:3029
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x80000150 -> 0x8000014f

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3086 Comm: syz-fuzzer Not tainted 6.8.0-rc4-syzkaller-00180-g4f5e5092fdbf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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