{"record":{"id":"b32a14cf49747fe4","repo":"firecracker-microvm/firecracker","slug":"file-too-short-to-contain-crc","errorCode":null,"errorMessage":"File too short to contain CRC","messagePattern":"File too short to contain CRC","errorType":"exception","errorClass":"SnapshotError","httpStatus":null,"severity":"error","filePath":"src/vmm/src/snapshot/mod.rs","lineNumber":99,"sourceCode":"\n/// Assumes the raw bytes stream read from the given [`Read`] instance is a snapshot file,\n/// and returns the version of it.\npub fn get_format_version<R: Read>(reader: &mut R) -> Result<Version, SnapshotError> {\n    // Check size limit before reading the full file to prevent DOS attacks\n    let mut buf = Vec::new();\n    let bytes_read = reader\n        .take((SNAPSHOT_DESERIALIZATION_BYTES_LIMIT + 1) as u64)\n        .read_to_end(&mut buf)?;\n\n    if bytes_read > SNAPSHOT_DESERIALIZATION_BYTES_LIMIT {\n        return Err(SnapshotError::SizeLimitExceeded(\n            SNAPSHOT_DESERIALIZATION_BYTES_LIMIT,\n        ));\n    }\n\n    // The last 8 bytes are the CRC, so we need to separate them for deserialization\n    if buf.len() < 8 {\n        return Err(SnapshotError::Io(std::io::Error::new(\n            std::io::ErrorKind::UnexpectedEof,\n            \"File too short to contain CRC\",\n        )));\n    }\n\n    let (data_buf, _crc_buf) = buf.split_at(buf.len() - 8);\n\n    // Since bitcode requires exact type matching, we need to try deserializing\n    // as the specific snapshot type we know about. In practice, all snapshots\n    // in Firecracker use MicrovmState as the data type.\n    use crate::persist::MicrovmState;\n\n    match bitcode::deserialize::<Snapshot<MicrovmState>>(data_buf) {\n        Ok(snapshot) => Ok(snapshot.header.version),\n        Err(e) => {\n            // If deserialization fails, it could be due to:\n            // 1. The snapshot was created with bincode (older versions)\n            // 2. The MicrovmState structure has changed and is incompatible","sourceCodeStart":81,"sourceCodeEnd":117,"githubUrl":"https://github.com/firecracker-microvm/firecracker/blob/0a745def42ddf4cc2a744d79a08a27ff50b5d27a/src/vmm/src/snapshot/mod.rs#L81-L117","documentation":"Error \"File too short to contain CRC\" thrown in firecracker-microvm/firecracker.","triggerScenarios":"Thrown at src/vmm/src/snapshot/mod.rs:99 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Regenerate the snapshot file; the current file is truncated or corrupted and lacks its CRC trailer.","Verify the snapshot file transfer completed and its size matches expectations before loading."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"0a745def42ddf4cc2a744d79a08a27ff50b5d27a","analyzedAt":"2026-08-19T05:27:02.517Z","contentChangedAt":"2026-08-19T05:27:02.517Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}