syzbot

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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff86c61f68 of 4 bytes by task 4199 on cpu 0:
 alloc_pid+0x62c/0x8e0 kernel/pid.c:323
 copy_process+0xf37/0x20c0 kernel/fork.c:2239
 kernel_clone+0x16b/0x5d0 kernel/fork.c:2654
 __do_sys_clone3 kernel/fork.c:2956 [inline]
 __se_sys_clone3+0x1f5/0x230 kernel/fork.c:2935
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:2935
 x64_sys_call+0x580/0x3020 arch/x86/include/generated/asm/syscalls_64.h:436
 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 0xffffffff86c61f68 of 4 bytes by task 2 on cpu 1:
 copy_process+0x1895/0x20c0 kernel/fork.c:2396
 kernel_clone+0x16b/0x5d0 kernel/fork.c:2654
 kernel_thread+0xe5/0x120 kernel/fork.c:2715
 create_kthread kernel/kthread.c:490 [inline]
 kthreadd+0x25b/0x320 kernel/kthread.c:849
 ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x800000df -> 0x800000e0

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 2 Comm: kthreadd Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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