CI: guard coordinator pushback test flips on parent still running (run #20 flake: post-commit flip re-failed requeued child on slow runner; test-only, no production change)

cloud/tests/test_audit_loop_coord.py

@@ -373,12 +373,25 @@ class CoordAuditTestCase(unittest.TestCase):
         while time.time() < deadline:
             conn = sqlite3.connect(self.db_path)
             try:
+                # 翻状态与父任务终态判定必须在同一条语句里原子
+                # 完成：只在父任务仍 running 时翻子任务。旧写法
+                # 是无条件翻状态，合流提交推回（父回 queued、子
+                # 回 queued）之后、协调员线程退出之前，翻状态线
+                # 程的下一拍会把已重排的 C1 重新翻回 failed，慢
+                # 机器上即表现为“父 queued、子 failed”的假失败
+                # （Gitea run #20 唯一失败项正是此断言；产品侧
+                # 合流本身无问题，直接调合流的 test_merge_pushback
+                # 在同一轮 CI 里通过）。
                 conn.execute(
                     "UPDATE tasks SET status = 'failed',"
-                    " error_text = 'boom' WHERE id = 'C1'")
+                    " error_text = 'boom' WHERE id = 'C1' AND"
+                    " (SELECT status FROM tasks WHERE id = 'P1')"
+                    " = 'running'")
                 conn.execute(
                     "UPDATE tasks SET status = 'completed',"
-                    " result_text = 'done' WHERE id = 'C2'")
+                    " result_text = 'done' WHERE id = 'C2' AND"
+                    " (SELECT status FROM tasks WHERE id = 'P1')"
+                    " = 'running'")
                 conn.commit()
             finally:
                 conn.close()