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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff86e5c368 of 4 bytes by task 4376 on cpu 0:
 alloc_pid+0x6da/0x960 kernel/pid.c:334
 copy_process+0x11cb/0x2340 kernel/fork.c:2326
 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2769
 __do_sys_clone3 kernel/fork.c:3072 [inline]
 __se_sys_clone3+0x1f5/0x230 kernel/fork.c:3051
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3051
 x64_sys_call+0x437/0x2550 arch/x86/include/generated/asm/syscalls_64.h:436
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff86e5c368 of 4 bytes by task 4367 on cpu 1:
 copy_process+0x1acf/0x2340 kernel/fork.c:2489
 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2769
 __do_sys_clone kernel/fork.c:2911 [inline]
 __se_sys_clone kernel/fork.c:2895 [inline]
 __x64_sys_clone+0x143/0x180 kernel/fork.c:2895
 x64_sys_call+0x2479/0x2550 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x800001b7 -> 0x800001b8

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 4367 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/08/2026
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