first PID is 0, separate idle to system

code/kernel/ke_thread.c

@@ -211,10 +211,14 @@ extern void KeKernelThreadEntry(void);
 
 __declspec(dllexport) KSTATUS KeCreateKernelThread(uintptr_t fn, uintptr_t arg,
                               THREAD_PRIORITY priority, THREAD** out) {
-    // Kernel threads are owned by the idle process. We need a PROCESS* for
-    // the owner field; grab it from the idle/init thread that already exists.
-    THREAD* idleThread = KeGetCurrentThread(); // safe to call before scheduler starts
-    PROCESS* owner = idleThread ? idleThread->Owner : (PROCESS*)0;
+    // Kernel worker threads are owned by the system process.  The scheduler's
+    // hand-built CPU idle thread stays attached to PID 0 (idle), while driver,
+    // async I/O, and init worker threads are grouped under PID 1 (system).
+    PROCESS* owner = KeGetSystemProcess();
+    if (!owner) {
+        THREAD* currentThread = KeGetCurrentThread();
+        owner = currentThread ? currentThread->Owner : (PROCESS*)0;
+    }
     if (!owner) return STATUS_INVALID_PARAMETER;
     if (priority >= PriorityCount) return STATUS_INVALID_PARAMETER;