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BUG: KCSAN: data-race in copy_process / free_pid

write to 0xffff888127c6a688 of 4 bytes by task 6366 on cpu 1:
 free_pid+0x79/0x190 kernel/pid.c:136
 copy_process+0x23eb/0x2fa0 kernel/fork.c:2431
 kernel_clone+0x15c/0x680 kernel/fork.c:2584
 __do_sys_clone kernel/fork.c:2701 [inline]
 __se_sys_clone kernel/fork.c:2685 [inline]
 __x64_sys_clone+0xc6/0xf0 kernel/fork.c:2685
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888127c6a688 of 4 bytes by task 6381 on cpu 0:
 copy_process+0x1e7b/0x2fa0 kernel/fork.c:2344
 kernel_clone+0x15c/0x680 kernel/fork.c:2584
 __do_sys_clone kernel/fork.c:2701 [inline]
 __se_sys_clone kernel/fork.c:2685 [inline]
 __x64_sys_clone+0xc6/0xf0 kernel/fork.c:2685
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x8000012e -> 0x8000012d

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 6381 Comm: syz-executor.4 Tainted: G        W         5.15.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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