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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff8685f030 of 4 bytes by task 7156 on cpu 1:
 alloc_pid+0x539/0x720 kernel/pid.c:280
 copy_process+0xe0e/0x1f90 kernel/fork.c:2445
 kernel_clone+0x16c/0x5b0 kernel/fork.c:2844
 __do_sys_clone3 kernel/fork.c:3148 [inline]
 __se_sys_clone3+0x1c2/0x200 kernel/fork.c:3127
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3127
 x64_sys_call+0x10c9/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:436
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff8685f030 of 4 bytes by task 7143 on cpu 0:
 copy_process+0x1790/0x1f90 kernel/fork.c:2587
 kernel_clone+0x16c/0x5b0 kernel/fork.c:2844
 __do_sys_clone kernel/fork.c:2987 [inline]
 __se_sys_clone kernel/fork.c:2971 [inline]
 __x64_sys_clone+0xe6/0x120 kernel/fork.c:2971
 x64_sys_call+0x2c59/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x800000d7 -> 0x800000d8

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 7143 Comm: dhcpcd-run-hook Not tainted 6.15.0-rc3-syzkaller-00342-g5bc1018675ec #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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