syzbot

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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff85a57bc8 of 4 bytes by task 16848 on cpu 0:
 alloc_pid+0x50a/0x6b0 kernel/pid.c:278
 copy_process+0x111f/0x2180 kernel/fork.c:2517
 kernel_clone+0x169/0x560 kernel/fork.c:2909
 __do_sys_clone3 kernel/fork.c:3210 [inline]
 __se_sys_clone3+0x1b5/0x1f0 kernel/fork.c:3194
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3194
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffffffff85a57bc8 of 4 bytes by task 2 on cpu 1:
 copy_process+0x1738/0x2180 kernel/fork.c:2653
 kernel_clone+0x169/0x560 kernel/fork.c:2909
 kernel_thread+0xb4/0xe0 kernel/fork.c:2971
 create_kthread kernel/kthread.c:411 [inline]
 kthreadd+0x28a/0x330 kernel/kthread.c:746
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

value changed: 0x800000c7 -> 0x800000c8

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2 Comm: kthreadd Not tainted 6.6.0-rc2-syzkaller-00414-g8a511e7efc5a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
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