{"record":{"id":"220410df889e7dff","repo":"vllm-project/vllm","slug":"another-elastic-ep-async-method-is-active","errorCode":null,"errorMessage":"Another Elastic EP async method is active","messagePattern":"Another Elastic EP async method is active","errorType":"exception","errorClass":"RuntimeError","httpStatus":null,"severity":"error","filePath":"vllm/distributed/elastic_ep/elastic_execute.py","lineNumber":172,"sourceCode":"        )\n        self._async_future: Future[None] | None = None\n\n    @property\n    def worker(self):\n        worker = self.worker_ref()\n        if worker is None:\n            raise RuntimeError(\"Worker has been garbage collected\")\n        return worker\n\n    def execute(self, execute_method: str, *args, **kwargs):\n        method = getattr(self, execute_method, None)\n        if method is None:\n            raise ValueError(f\"Unknown execute method: {execute_method}\")\n        return method(*args, **kwargs)\n\n    def start_async(self, execute_method: str, *args, **kwargs) -> str:\n        if self._async_future is not None:\n            raise RuntimeError(\"Another Elastic EP async method is active\")\n        if args and isinstance(args[0], ReconfigureDistributedRequest):\n            self.reconfig_request = args[0]\n        dp_rank = self.worker.vllm_config.parallel_config.data_parallel_rank\n        done_key = f\"eep_async/{execute_method}/{dp_rank}/{self.worker.rank}\"\n        self._async_future = self._async_executor.submit(\n            self._run_async, execute_method, *args, **kwargs\n        )\n        self._async_future.add_done_callback(lambda _: self._mark_async_done(done_key))\n        return done_key\n\n    def _run_async(self, execute_method: str, *args, **kwargs) -> None:\n        from vllm.platforms import current_platform\n\n        self.worker.vllm_config.enable_trace_function_call_for_thread()\n        assert hasattr(self.worker, \"device\")\n        current_platform.set_device(self.worker.device)\n        with set_current_vllm_config(self.worker.vllm_config):\n            self.execute(execute_method, *args, **kwargs)","sourceCodeStart":154,"sourceCodeEnd":190,"githubUrl":"https://github.com/vllm-project/vllm/blob/c794754062d49a8fdb63ab3c5215b488b865030c/vllm/distributed/elastic_ep/elastic_execute.py#L154-L190","documentation":"Error \"Another Elastic EP async method is active\" thrown in vllm-project/vllm.","triggerScenarios":"Raised at vllm/distributed/elastic_ep/elastic_execute.py:172 when validation fails: Another Elastic EP async method is active. Typically triggered by an incompatible or incomplete vLLM configuration, an unsupported platform/backend combination, or a runtime resource/dependency that is missing.","commonSituations":"Commonly encountered at vllm/distributed/elastic_ep/elastic_execute.py:172 during vLLM startup/config validation or runtime setup when: (1) conflicting CLI flags or config fields are combined, (2) the current platform (CUDA/ROCm/CPU/XPU) or installed optional packages do not support the requested feature, or (3) a required value is absent or out of range. Resolve by correcting the configuration as described in the message, or by selecting a supported alternative.","solutions":["Wait for the active Elastic EP async method to complete before starting another one.","Do not invoke concurrent Elastic EP async operations."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"c794754062d49a8fdb63ab3c5215b488b865030c","analyzedAt":"2026-08-14T21:17:39.825Z","schemaVersion":2},"datasetVersion":"2026-08-15T17:31:12.345Z"}