{"record":{"id":"e23af75e2df5cbd0","repo":"unslothai/unsloth","slug":"subprocess-error-error-msg-e23af7","errorCode":null,"errorMessage":"Subprocess error: {error_msg}","messagePattern":"Subprocess error: (.+?)","errorType":"exception","errorClass":"RuntimeError","httpStatus":500,"severity":"error","filePath":"studio/backend/core/inference/orchestrator.py","lineNumber":594,"sourceCode":"\n        while time.monotonic() < deadline:\n            remaining = max(0.1, deadline - time.monotonic())\n            resp = self._read_resp(timeout = min(remaining, 1.0))\n\n            if resp is None:\n                # Check subprocess health\n                if not self._ensure_subprocess_alive():\n                    raise RuntimeError(self._subprocess_crash_message(\"wait\"))\n                continue\n\n            rtype = resp.get(\"type\", \"\")\n\n            if rtype == expected_type:\n                return resp\n\n            if rtype == \"error\":\n                error_msg = resp.get(\"error\", \"Unknown error\")\n                raise RuntimeError(f\"Subprocess error: {error_msg}\")\n\n            if rtype == \"status\":\n                logger.info(\"Subprocess status: %s\", resp.get(\"message\", \"\"))\n                # Reset deadline — subprocess is still alive and working\n                deadline = time.monotonic() + timeout\n                continue\n\n            if rtype == \"stall\":\n                msg = resp.get(\"message\", \"Download stalled\")\n                logger.warning(\"Subprocess reported stall: %s\", msg)\n                raise DownloadStallError(msg)\n\n            # Other response types during wait — skip\n            logger.debug(\n                \"Skipping response type '%s' while waiting for '%s'\",\n                rtype,\n                expected_type,\n            )","sourceCodeStart":576,"sourceCodeEnd":612,"githubUrl":"https://github.com/unslothai/unsloth/blob/203007d19051dcd2ae33876786d117c99f6b0368/studio/backend/core/inference/orchestrator.py#L576-L612","documentation":"Raised by _wait_response in the orchestrator when the inference subprocess replies with a response of type 'error' while the backend was waiting for some other expected response type. The message embeds the worker-side error string, so the real failure happened inside the subprocess (e.g. during model load, weight download, or generation) and is merely relayed here. It is a generic relay envelope, not a diagnosis itself.","triggerScenarios":"Any orchestrator command whose worker handler raises: load_model / generate / TTS requests that hit an exception in the subprocess and are answered with {'type': 'error', 'error': ...} instead of the expected 'loaded'/'audio_done' response.","commonSituations":"Corrupt or incompatible model weights, CUDA OOM inside the worker, missing model files on disk, an unsloth/transformers patch failing at load time, or a Python exception in worker-side generation code surfaced after a model switch.","solutions":["Read the embedded error_msg — it names the actual worker-side exception; fix that root cause.","Check backend logs for the worker traceback that accompanied the subprocess 'error' response.","If the error mentions CUDA memory, unload other models / free VRAM and retry the load.","If it mentions missing files, verify the model snapshot under the HF cache and re-download.","As a last resort, restart the backend so the inference subprocess is respawned clean."],"exampleFix":"// before\nresp = orchestrator._wait_response(\"loaded\", timeout=600)\n// after\ntry:\n    resp = orchestrator._wait_response(\"loaded\", timeout=600)\nexcept RuntimeError as e:\n    if str(e).startswith(\"Subprocess error:\"):\n        logger.error(\"worker failed: %s\", e)\n    raise","handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"try:\n    orchestrator.load_model(name)\nexcept RuntimeError as e:\n    if str(e).startswith(\"Subprocess error:\"):\n        # worker-side failure; inspect embedded message and logs\n        handle_worker_failure(e)\n    raise","preventionTips":["Keep the inference subprocess healthy — fix load-time exceptions rather than retrying blindly.","Log the full embedded error_msg, not just the envelope.","Pre-download model weights so worker-side download errors cannot occur."],"tags":["inference","subprocess","runtime-error","relay"],"backgroundTag":null,"analyzedSha":"203007d19051dcd2ae33876786d117c99f6b0368","analyzedAt":"2026-08-15T02:48:39.846Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}