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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff8665d858 of 4 bytes by task 3057 on cpu 0:
 alloc_pid+0x542/0x6f0 kernel/pid.c:284
 copy_process+0xe72/0x1f90 kernel/fork.c:2390
 kernel_clone+0x167/0x5e0 kernel/fork.c:2786
 __do_sys_clone3 kernel/fork.c:3090 [inline]
 __se_sys_clone3+0x1ba/0x200 kernel/fork.c:3069
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3069
 x64_sys_call+0x287d/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:436
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff8665d858 of 4 bytes by task 3307 on cpu 1:
 copy_process+0x1799/0x1f90 kernel/fork.c:2529
 kernel_clone+0x167/0x5e0 kernel/fork.c:2786
 __do_sys_clone3 kernel/fork.c:3090 [inline]
 __se_sys_clone3+0x1ba/0x200 kernel/fork.c:3069
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3069
 x64_sys_call+0x287d/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:436
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x800000f1 -> 0x800000f2

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3307 Comm: syz-executor Not tainted 6.12.0-rc7-syzkaller-00192-gb5a24181e461 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
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