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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff8685fc68 of 4 bytes by task 7812 on cpu 1:
 alloc_pid+0x539/0x720 kernel/pid.c:281
 copy_process+0xe25/0x2000 kernel/fork.c:2185
 kernel_clone+0x16c/0x5c0 kernel/fork.c:2599
 __do_sys_clone3 kernel/fork.c:2903 [inline]
 __se_sys_clone3+0x1c2/0x200 kernel/fork.c:2882
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:2882
 x64_sys_call+0x1fc9/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:436
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff8685fc68 of 4 bytes by task 3030 on cpu 0:
 copy_process+0x14a6/0x2000 kernel/fork.c:2342
 kernel_clone+0x16c/0x5c0 kernel/fork.c:2599
 __do_sys_clone kernel/fork.c:2742 [inline]
 __se_sys_clone kernel/fork.c:2726 [inline]
 __x64_sys_clone+0xe6/0x120 kernel/fork.c:2726
 x64_sys_call+0x119c/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x800000d3 -> 0x800000d4

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3030 Comm: dhcpcd Tainted: G        W           6.16.0-syzkaller-10355-gf2d282e1dfb3 #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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