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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff86a61ee8 of 4 bytes by task 19026 on cpu 1:
 alloc_pid+0x62c/0x8e0 kernel/pid.c:323
 copy_process+0xf37/0x20c0 kernel/fork.c:2239
 kernel_clone+0x16b/0x5b0 kernel/fork.c:2654
 __do_sys_clone kernel/fork.c:2795 [inline]
 __se_sys_clone kernel/fork.c:2779 [inline]
 __x64_sys_clone+0x143/0x180 kernel/fork.c:2779
 x64_sys_call+0x1222/0x3020 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff86a61ee8 of 4 bytes by task 25129 on cpu 0:
 copy_process+0x1895/0x20c0 kernel/fork.c:2396
 kernel_clone+0x16b/0x5b0 kernel/fork.c:2654
 __do_sys_clone kernel/fork.c:2795 [inline]
 __se_sys_clone kernel/fork.c:2779 [inline]
 __x64_sys_clone+0x143/0x180 kernel/fork.c:2779
 x64_sys_call+0x1222/0x3020 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x80000171 -> 0x80000172

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 25129 Comm: dhcpcd-run-hook Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
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