mark task before it runs eagerly

Author: deadlovelll

Misc/NEWS.d/next/Core_and_Builtins/2026-06-23-19-50-22.gh-issue-152020.DTKXjR.rst

@@ -0,0 +1,3 @@
+On the free-threaded build, :func:`asyncio.all_tasks` no longer lost
+eager-started tasks when called from a thread other than the one running the
+event loop

Modules/_asynciomodule.c

@@ -2190,6 +2190,9 @@ register_task(_PyThreadStateImpl *ts, TaskObj *task)
         assert(task->task_node.prev != NULL);
         return;
     }
+#ifdef Py_GIL_DISABLED
+    _PyObject_SetMaybeWeakref((PyObject *)task);
+#endif
     struct llist_node *head = &ts->asyncio_tasks_head;
     llist_insert_tail(head, &task->task_node);
 }