{"record":{"id":"269e4065852ebf71","repo":"vllm-project/vllm","slug":"model-with-config-mismatch-with","errorCode":null,"errorMessage":"Model: {} with config {} {} {} {} {} mismatch with new model {} with config {} {} {} {}","messagePattern":"Model: (.+?) with config (.+?) (.+?) (.+?) (.+?) (.+?) mismatch with new model (.+?) with config (.+?) (.+?) (.+?) (.+?)","errorType":"exception","errorClass":"RuntimeError","httpStatus":null,"severity":"error","filePath":"vllm/distributed/eplb/eplb_state.py","lineNumber":338,"sourceCode":"            i % num_routed_experts for i in range(num_redundant_experts)\n        ]\n        return global_physical_to_logical_map\n\n    def validate_ep_configuration(self, new_model: MixtureOfExperts):\n        \"\"\"\n        Validate that the expert parallel configuration of\n        the new model is the same as the existing models.\n        \"\"\"\n        if len(self.model_states) > 0:\n            model = next(iter(self.model_states.values())).model\n            if (\n                model.num_routed_experts != new_model.num_routed_experts\n                or model.num_redundant_experts != new_model.num_redundant_experts\n                or model.num_physical_experts != new_model.num_physical_experts\n                or model.num_logical_experts != new_model.num_logical_experts\n                or model.num_expert_groups != new_model.num_expert_groups\n            ):\n                raise RuntimeError(\n                    \"Model: {} \"\n                    \"with config {} \"\n                    \"{} {} {} {} \"\n                    \"mismatch with new model {} \"\n                    \"with config {} \"\n                    \"{} {} {} {}\".format(\n                        type(model),\n                        model.num_routed_experts,\n                        model.num_redundant_experts,\n                        model.num_physical_experts,\n                        model.num_logical_experts,\n                        model.num_expert_groups,\n                        type(new_model),\n                        new_model.num_routed_experts,\n                        new_model.num_redundant_experts,\n                        new_model.num_physical_experts,\n                        new_model.num_logical_experts,\n                        new_model.num_expert_groups,","sourceCodeStart":320,"sourceCodeEnd":356,"githubUrl":"https://github.com/vllm-project/vllm/blob/c794754062d49a8fdb63ab3c5215b488b865030c/vllm/distributed/eplb/eplb_state.py#L320-L356","documentation":"Error \"Model: {} with config {} {} {} {} {} mismatch with new model {} with config {} {} {} {}\" thrown in vllm-project/vllm.","triggerScenarios":"Raised at vllm/distributed/eplb/eplb_state.py:338 when validation fails: Model config mismatch with new model during elastic EP reconfiguration. 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/eplb/eplb_state.py:338 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":["Ensure the new model and configuration match the loaded model's architecture and parallel config before reconfiguring EPLB state."],"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":"2026-08-15T22:17:37.221Z"}