{"record":{"id":"11db5709664eeb0e","repo":"unslothai/unsloth","slug":"extra-llama-server-args-are-too-large-limit-limi","errorCode":null,"errorMessage":"extra llama-server args are too large (limit {limit} bytes)","messagePattern":"extra llama-server args are too large \\(limit (.+?) bytes\\)","errorType":"validation","errorClass":"ValueError","httpStatus":400,"severity":"error","filePath":"studio/backend/core/inference/llama_server_args.py","lineNumber":267,"sourceCode":"            raise ValueError(\n                f\"too many extra llama-server args (limit {MAX_EXTRA_ARG_TOKENS} tokens)\"\n            )\n        # A grammar or JSON schema is a legitimately long single token, so the cap\n        # is on the whole list rather than per token.\n        # Strictly, unlike the sizing below: JSON and the browser can both carry an\n        # unpaired surrogate, which survives every check here and then makes\n        # subprocess.Popen raise while it encodes argv, long after the load has begun\n        # switching models. Refused at the boundary, where it is still a 400.\n        try:\n            encoded = token.encode(\"utf-8\")\n        except UnicodeEncodeError as error:\n            raise ValueError(\n                \"extra llama-server args cannot contain unpaired surrogate characters\"\n            ) from error\n        total_bytes += len(encoded)\n        limit = max_extra_args_bytes()\n        if total_bytes > limit:\n            raise ValueError(f\"extra llama-server args are too large (limit {limit} bytes)\")\n        # execve rejects a NUL outright; the rest would reach the child's parser as\n        # invisible characters and be blamed on the flag they are attached to.\n        if _has_control_characters(token):\n            raise ValueError(\"extra llama-server args cannot contain control characters\")\n        flag = _flag_name(token)\n        if flag is not None and flag in _DENYLIST:\n            raise ValueError(\n                f\"llama-server flag '{flag}' is managed by Unsloth Studio \"\n                f\"and cannot be passed as an extra arg\"\n            )\n        if flag is None:\n            # A token belonging to no flag. Today's llama-server answers \"invalid\n            # argument\" and refuses to start, which is a failed load rather than a\n            # 400, and a build that did accept a positional would read it as the\n            # model path: that is the one thing the -m / --model denial exists to\n            # prevent, and it would sidestep the native-path lease as well.\n            if pending_values <= 0:\n                raise ValueError(","sourceCodeStart":249,"sourceCodeEnd":285,"githubUrl":"https://github.com/unslothai/unsloth/blob/203007d19051dcd2ae33876786d117c99f6b0368/studio/backend/core/inference/llama_server_args.py#L249-L285","documentation":"ValueError from llama_server_args.py:267 — the cumulative UTF-8 byte size of the extra args list exceeds max_extra_args_bytes(). Each token's encoded length is summed across the whole list (long single tokens like grammars are allowed per-token; this is a total budget). It exists so a multi-megabyte argv cannot reach subprocess spawn / execve limits, and fails as a 400 at the request boundary.","triggerScenarios":"Submitting extra args whose combined UTF-8 size passes the byte limit — typically one or a few huge tokens such as a full GBNF grammar, a JSON schema, or an embedded chat template.","commonSituations":"Passing a large --json-schema or grammar file inline instead of by path; a chat template override carrying the whole Jinja template; limit lowered via env for a constrained deployment.","solutions":["Move the big payload out of argv: write the grammar/schema to a file and pass its path (--grammar-file, --schema-file / a known llama-server file flag) — one short token instead of kilobytes.","Minify the payload (strip whitespace/comments from the JSON schema or grammar) if it is only slightly over.","Check max_extra_args_bytes() for the exact budget and compare against sum of len(t.encode('utf-8')) for your tokens.","If self-hosting and the OS argv limit allows, raise the configured byte limit."],"exampleFix":"# before\nextra_args = [\"--grammar\", open(\"big.gbnf\").read()]  # huge inline token\n\n# after\nextra_args = [\"--grammar-file\", \"/models/grammars/big.gbnf\"]","handlingStrategy":"validation","validationCode":"from core.inference.llama_server_args import max_extra_args_bytes\ntotal = sum(len(str(t).encode(\"utf-8\")) for t in extra_args)\nif total > max_extra_args_bytes():\n    raise HTTPException(400, \"extra args too large; use file paths\")","typeGuard":"def within_byte_budget(args, budget) -> bool:\n    return sum(len(str(t).encode(\"utf-8\")) for t in args) <= budget","tryCatchPattern":"try:\n    validate_extra_args(args)\nexcept ValueError as e:\n    if \"too large\" in str(e):\n        raise HTTPException(400, \"pass grammars/schemas via --grammar-file path\")\n    raise","preventionTips":["Pass big payloads (grammar, JSON schema, chat template) by file path, never inline.","Compute the byte total the same way the validator does before submit.","Minify JSON schemas and grammars if they must stay inline.","Watch for non-ASCII content — UTF-8 bytes exceed character counts."],"tags":["llama-server","validation","argv","size-limit","configuration"],"backgroundTag":null,"analyzedSha":"203007d19051dcd2ae33876786d117c99f6b0368","analyzedAt":"2026-08-15T02:48:39.846Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}