{"record":{"id":"df54f8123e16a053","repo":"uutils/coreutils","slug":"failed-to-join-with-the-output-thread","errorCode":null,"errorMessage":"Failed to join with the output thread.","messagePattern":"Failed to join with the output thread\\.","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"error","filePath":"src/uu/dd/src/dd.rs","lineNumber":1267,"sourceCode":"                i.discard_cache(read_offset, 0);\n            }\n            if output_nocache || output_direct {\n                o.discard_cache(write_offset.try_into().unwrap(), 0);\n            }\n            break;\n        }\n        let Ok(wstat_update) = o.write_blocks(data).map_err(|e| copy_error = Some(e)) else {\n            break;\n        };\n\n        // Discard the system file cache for the read portion of\n        // the input file.\n        //\n        // TODO Better error handling for overflowing `offset` and `len`.\n        let read_len = rstat_update.bytes_total;\n        if input_nocache {\n            let offset = read_offset;\n            let len = read_len;\n            i.discard_cache(offset, len);\n        }\n        read_offset += read_len;\n\n        // Discard the system file cache for the written portion\n        // of the output file.\n        //\n        // TODO Better error handling for overflowing `offset` and `len`.\n        let write_len = wstat_update.bytes_total;\n        if output_nocache {\n            let offset = write_offset.try_into().unwrap();\n            let len = write_len.try_into().unwrap();\n            o.discard_cache(offset, len);\n        }\n        write_offset += write_len;\n\n        // Update the read/write stats and inform the progress thread once per second.\n        //","sourceCodeStart":1249,"sourceCodeEnd":1285,"githubUrl":"https://github.com/uutils/coreutils/blob/9ff4114e82c8fb80420fd4fb6a319bd3227095e0/src/uu/dd/src/dd.rs#L1249-L1285","documentation":"Error \"Failed to join with the output thread.\" thrown in uutils/coreutils.","triggerScenarios":"Occurs when dd cannot join its output thread, meaning the output thread panicked or terminated abnormally.","commonSituations":"An I/O error or panic inside dd's writer thread, surfacing at join time.","solutions":["Ensure the output thread has not panicked; check its error before joining.","Close the input side properly so the output thread can finish and be joined."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"9ff4114e82c8fb80420fd4fb6a319bd3227095e0","analyzedAt":"2026-08-19T21:43:27.871Z","contentChangedAt":"2026-08-19T21:43:27.871Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}