{"record":{"id":"2001ebefc93c52f1","repo":"GitoxideLabs/gitoxide","slug":"thread-failed-to-send-result","errorCode":null,"errorMessage":"Thread failed to send result","messagePattern":"Thread failed to send result","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"gitoxide-core/src/query/engine/update.rs","lineNumber":334,"sourceCode":"                                                            }),\n                                                        });\n                                                    }\n                                                }\n                                                Ok::<_, Infallible>(std::ops::ControlFlow::Continue(()))\n                                            })?;\n                                        out_chunk.push(CommitDiffStats {\n                                            id: commit,\n                                            changes: out,\n                                        });\n                                    } else {\n                                        out_chunk.push(CommitDiffStats {\n                                            id: commit,\n                                            changes: Vec::new(),\n                                        });\n                                    }\n                                }\n                                if tx_stats.send(Ok((chunk_id, out_chunk))).is_err() {\n                                    bail!(\"Thread failed to send result\");\n                                }\n                            }\n                            Ok(())\n                        }\n                    })\n                })\n                .collect::<Vec<_>>();\n            (tx, stat_workers)\n        };\n        drop(tx_stats);\n\n        #[derive(Clone)]\n        struct Db<'a, Find: Clone> {\n            inner: &'a Find,\n            progress: &'a dyn gix::progress::Count,\n            chunk: std::cell::RefCell<Vec<Task>>,\n            chunk_id: std::cell::RefCell<SequenceId>,\n            chunk_size: usize,","sourceCodeStart":316,"sourceCodeEnd":352,"githubUrl":"https://github.com/GitoxideLabs/gitoxide/blob/e73179060badf27222d790981fac3f84c1830a7e/gitoxide-core/src/query/engine/update.rs#L316-L352","documentation":"In gitoxide's query engine update, a worker thread's statistics channel (tx_stats) could not deliver its (chunk_id, chunk) result because the receiving end was dropped (the receiver thread exited or the operation was interrupted/aborted). The update bails out instead of silently losing results. This indicates the update pipeline shut down mid-flight rather than a problem with the repository data itself.","triggerScenarios":"Calling the public `update` function when the stats receiver side of the mpsc channel has been dropped before all worker threads finish sending - e.g. after a fatal error in the consumer, or when the operation is interrupted (Ctrl-C) and the receiver is torn down while workers still hold `tx_stats.send`.","commonSituations":"Interrupting a long `gix query update` with SIGINT while background threads still stream results; a receiver-side panic that drops the channel; shutting down during large database updates on huge commit graphs.","solutions":["Re-run the update command without interrupting it, letting all threads finish","Check for a prior error or panic in the consumer thread that dropped the receiver and fix that root cause","Retry the update on a smaller scope/chunk to reduce the window for interruption","If reproducible, report the issue - a dropped receiver before joins usually signals an abort-path bug"],"exampleFix":"// before\nif tx_stats.send(Ok((chunk_id, out_chunk))).is_err() {\n    bail!(\"Thread failed to send result\");\n}\n// after\nif tx_stats.send(Ok((chunk_id, out_chunk))).is_err() {\n    // receiver gone: exit worker quietly instead of failing the whole update\n    return Ok(());\n}","handlingStrategy":"try-catch","validationCode":"if gix::interrupt::is_triggered() { return Err(anyhow!(\"operation interrupted before starting update\")); }","typeGuard":null,"tryCatchPattern":"match engine_update(...) {\n    Ok(()) => {},\n    Err(e) if e.to_string().contains(\"Thread failed to send result\") => {\n        // consumer aborted or user interrupt; retry without interruption\n        eprintln!(\"update pipeline shut down mid-flight; retrying\");\n    }\n    Err(e) => return Err(e),\n}","preventionTips":["Do not interrupt (Ctrl-C) long-running update commands; run them under nohup or a robust job runner","Keep the receiver thread alive until all worker handles are joined","Handle SIGINT gracefully so the receiver drains the channel before shutdown"],"tags":["concurrency","threading","interrupted-operation"],"backgroundTag":"channel-send-failed","analyzedSha":"e73179060badf27222d790981fac3f84c1830a7e","analyzedAt":"2026-09-08T11:26:50.865Z","contentChangedAt":"2026-09-08T11:26:50.865Z","schemaVersion":2},"datasetVersion":"2026-09-15T23:17:13.987Z"}