{"record":{"id":"f3b0c82c4cc15612","repo":"sgl-project/sglang","slug":"kv-canary-has-swa-lut-must-be-bool-got-type-has","errorCode":null,"errorMessage":"kv-canary: has_swa_lut must be bool, got {type(has_swa_lut).__name__}","messagePattern":"kv-canary: has_swa_lut must be bool, got (.+?)","errorType":"validation","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"python/sglang/kernels/ops/kv_canary/plan/offsets_kernel.py","lineNumber":175,"sourceCode":"        raise ValueError(\n            f\"kv-canary: write_offsets_len must be positive, got {write_offsets_len}\"\n        )\n    if write_req_capacity < 0:\n        raise ValueError(\n            f\"kv-canary: write_req_capacity must be non-negative, got {write_req_capacity}\"\n        )\n    if verify_capacity < 0:\n        raise ValueError(\n            f\"kv-canary: verify_capacity must be non-negative, got {verify_capacity}\"\n        )\n    if req_to_token_stride0 <= 0:\n        raise ValueError(\n            f\"kv-canary: req_to_token_stride0 must be positive, got {req_to_token_stride0}\"\n        )\n    if lut_len < 0:\n        raise ValueError(f\"kv-canary: lut_len must be non-negative, got {lut_len}\")\n    if not isinstance(has_swa_lut, bool):\n        raise ValueError(\n            f\"kv-canary: has_swa_lut must be bool, got {type(has_swa_lut).__name__}\"\n        )\n    if has_swa_lut and lut_len <= 0:\n        raise ValueError(\"kv-canary: lut_len must be positive when has_swa_lut is True\")\n    if not has_swa_lut and lut_len != 0:\n        raise ValueError(\"kv-canary: lut_len must be 0 when has_swa_lut is False\")\n\n    _require_len(req_pool_indices, \"req_pool_indices\", bs)\n    _require_len(prefix_lens, \"prefix_lens\", bs)\n    _require_len(extend_seq_lens, \"extend_seq_lens\", bs)\n    _require_2d(req_to_token, \"req_to_token\")\n    _require_min_len(lut_tensor, \"lut_tensor\", max(lut_len, 1))\n    _require_min_len(\n        out_verify_offsets_scratch,\n        \"out_verify_offsets_scratch\",\n        _PLAN_BS_BLOCK_SIZE + 1,\n    )\n    _require_len(out_write_offsets, \"out_write_offsets\", write_offsets_len)","sourceCodeStart":157,"sourceCodeEnd":193,"githubUrl":"https://github.com/sgl-project/sglang/blob/0132848349585cfe6aae51c4941cbae872505f8a/python/sglang/kernels/ops/kv_canary/plan/offsets_kernel.py#L157-L193","documentation":"has_swa_lut is a compile-time specialization flag for the JIT offsets kernel and must be a genuine Python bool, since the value is used to select which kernel variant is compiled and launched.","triggerScenarios":"Calling launch_plan_offsets_kernel with has_swa_lut as a non-bool (e.g. 0/1, numpy bool, torch bool tensor, or None).","commonSituations":"Passing full_to_swa_index_mapping is not None directly without converting to bool, or forwarding a numpy/torch boolean from data pipelines.","solutions":["Pass has_swa_lut = full_to_swa_index_mapping is not None (a real bool)","Convert foreign boolean types with bool(...) before calling"],"exampleFix":"// before\nlaunch_plan_offsets_kernel(..., has_swa_lut=int(lut is not None))\n// after\nlaunch_plan_offsets_kernel(..., has_swa_lut=lut is not None)","handlingStrategy":"type-guard","validationCode":"has_swa_lut = bool(full_to_swa_index_mapping is not None)","typeGuard":"def as_kernel_flag(value) -> bool:\n    if not isinstance(value, bool):\n        raise TypeError(f\"expected bool, got {type(value).__name__}\")\n    return value","tryCatchPattern":null,"preventionTips":["Always pass `lut is not None` style expressions so the flag is a real bool"],"tags":["kv-canary","type-check","argument-validation"],"backgroundTag":"type-validation-failed","analyzedSha":"0132848349585cfe6aae51c4941cbae872505f8a","analyzedAt":"2026-08-28T05:10:05.995Z","schemaVersion":2},"datasetVersion":"2026-08-28T06:17:29.519Z"}