{"record":{"id":"4388900806690c84","repo":"FuelLabs/fuel-core","slug":"could-not-convert-upload-root-to-bytes32","errorCode":null,"errorMessage":"Could not convert upload root to Bytes32: {}","messagePattern":"Could not convert upload root to Bytes32: (.+?)","errorType":"exception","errorClass":"Error::Serialization","httpStatus":null,"severity":"error","filePath":"crates/services/block_aggregator_api/src/blocks/old_block_source/convertor_adapter/proto_to_fuel_conversions.rs","lineNumber":763,"sourceCode":"                .map(|p| policies_from_proto_policies(&p))\n                .unwrap_or_default();\n            let inputs = proto_upload\n                .inputs\n                .iter()\n                .map(input_from_proto_input)\n                .collect::<crate::result::Result<Vec<_>>>()?;\n            let outputs = proto_upload\n                .outputs\n                .iter()\n                .map(output_from_proto_output)\n                .collect::<crate::result::Result<Vec<_>>>()?;\n            let witnesses = proto_upload\n                .witnesses\n                .iter()\n                .map(|w| Ok(Witness::from(w.clone())))\n                .collect::<crate::result::Result<Vec<_>>>()?;\n            let root = Bytes32::try_from(proto_upload.root.as_slice()).map_err(|e| {\n                Error::Serialization(anyhow!(\n                    \"Could not convert upload root to Bytes32: {}\",\n                    e\n                ))\n            })?;\n            let witness_index =\n                u16::try_from(proto_upload.witness_index).map_err(|e| {\n                    Error::Serialization(anyhow!(\n                        \"Could not convert witness_index to u16: {}\",\n                        e\n                    ))\n                })?;\n            let subsection_index =\n                u16::try_from(proto_upload.subsection_index).map_err(|e| {\n                    Error::Serialization(anyhow!(\n                        \"Could not convert subsection_index to u16: {}\",\n                        e\n                    ))\n                })?;","sourceCodeStart":745,"sourceCodeEnd":781,"githubUrl":"https://github.com/FuelLabs/fuel-core/blob/b9d4d170da3a31c9ace5f963d633b326348e0d42/crates/services/block_aggregator_api/src/blocks/old_block_source/convertor_adapter/proto_to_fuel_conversions.rs#L745-L781","documentation":"Upload transactions carry a Merkle root as a fixed 32-byte Bytes32. The convertor does Bytes32::try_from(proto_upload.root.as_slice()); if the bytes field is any length other than 32, try_from fails and the error is wrapped with this message. It aborts construction of the UploadBody.","triggerScenarios":"An Upload proto whose root field is empty (0 bytes, producer never set it — try_from on empty slice fails) or a wrong-size value (31/33 bytes) from a buggy encoder or corrupted payload.","commonSituations":"Producer omitted root (prost bytes default to empty); truncation/corruption of proto payloads in transport or storage; encoder from another chain version using different root length.","solutions":["Check root.len() == 32 before calling the conversion and reject/log the transaction id for follow-up","Fix the producer so it always writes the 32-byte Merkle root of the uploaded bytecode","Verify payload integrity (checksum/re-serialization round-trip) on the transport that delivered the proto","If reading legacy data, re-encode with the correct root rather than padding"],"exampleFix":"// before\nlet root = Bytes32::try_from(proto_upload.root.as_slice()).map_err(...)?;\n\n// after\nfn is_bytes32(b: &[u8]) -> bool { b.len() == 32 }\nif !is_bytes32(&proto_upload.root) {\n    return Err(anyhow!(\"upload root has {} bytes, expected 32\", proto_upload.root.len()));\n}\nlet root = Bytes32::try_from(proto_upload.root.as_slice()).map_err(...)?;","handlingStrategy":"validation","validationCode":"fn upload_root_is_valid(u: &ProtoUpload) -> bool { u.root.len() == 32 }","typeGuard":"fn is_bytes32(b: &[u8]) -> bool { b.len() == 32 }","tryCatchPattern":"match Bytes32::try_from(u.root.as_slice()) {\n    Ok(root) => Ok(root),\n    Err(e) => Err(anyhow!(\"upload root invalid (len {}): {}\", u.root.len(), e)),\n}","preventionTips":["Assert fixed-width (32-byte) fields before any conversion call","Compute the root from the uploaded bytecode and compare with the wire value","Checksum payloads at the transport layer to catch truncation"],"tags":["rust","fuel","protobuf","serialization","upload-transaction","bytes32","validation"],"backgroundTag":null,"analyzedSha":"b9d4d170da3a31c9ace5f963d633b326348e0d42","analyzedAt":"2026-08-16T08:56:42.692Z","schemaVersion":2},"datasetVersion":"2026-08-16T13:17:31.715Z"}