==================================================================
BUG: KCSAN: data-race in copy_process / free_pid

write to 0xffffffff85a54218 of 4 bytes by task 21550 on cpu 1:
 free_pid+0x79/0x190 kernel/pid.c:136
 copy_process+0x2443/0x2fd0 kernel/fork.c:2429
 kernel_clone+0x15c/0x6a0 kernel/fork.c:2582
 __do_sys_clone kernel/fork.c:2699 [inline]
 __se_sys_clone kernel/fork.c:2683 [inline]
 __x64_sys_clone+0xc6/0xf0 kernel/fork.c:2683
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffffff85a54218 of 4 bytes by task 21601 on cpu 0:
 copy_process+0x1f1f/0x2fd0 kernel/fork.c:2342
 kernel_clone+0x15c/0x6a0 kernel/fork.c:2582
 __do_sys_clone kernel/fork.c:2699 [inline]
 __se_sys_clone kernel/fork.c:2683 [inline]
 __x64_sys_clone+0xc6/0xf0 kernel/fork.c:2683
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x80000192 -> 0x80000191

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 21601 Comm: dhcpcd-run-hook Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================