{"record":{"id":"73c7fc0ef72dfb72","repo":"zellij-org/zellij","slug":"failed-to-spawn-runtime-for-download-task","errorCode":null,"errorMessage":"failed to spawn runtime for download task","messagePattern":"failed to spawn runtime for download task","errorType":"exception","errorClass":"DownloaderError","httpStatus":null,"severity":"error","filePath":"zellij-utils/src/downloader.rs","lineNumber":199,"sourceCode":"    ///\n    /// At the moment, this function is only here to bridge the gap between the async\n    /// [`Downloader`] impl and the sync [`Layout`] code that ultimately calls this function. This\n    /// is needed since the Layout code can't trivially be turned `async` without a lot of\n    /// refactoring, while the Downloader is used in many other places with async code and can't\n    /// sensibly be sync. Maybe in the future, when more code around here is async, we can drop\n    /// this function.\n    pub fn download_without_cache_blocking(url: &str) -> Result<String, DownloaderError> {\n        let runtime_handle = match tokio::runtime::Handle::try_current() {\n            Ok(handle) => handle.clone(),\n            Err(e) if e.is_missing_context() => {\n                let runtime = tokio::runtime::Builder::new_current_thread()\n                    .thread_name(\"ephemeral runtime for downloader implementation\")\n                    .build()\n                    .map_err(DownloaderError::Io)?;\n                runtime.handle().clone()\n            },\n            _ => {\n                return Err(DownloaderError::Io(std::io::Error::new(\n                    std::io::ErrorKind::Other,\n                    \"failed to spawn runtime for download task\",\n                )))\n            },\n        };\n        runtime_handle.block_on(async move { Downloader::download_without_cache(url).await })\n    }\n\n    fn parse_name(&self, url: &str) -> Result<String, DownloaderError> {\n        Url::parse(url)\n            .map_err(|_| DownloaderError::NotFoundFileName(url.to_string()))?\n            .path_segments()\n            .ok_or_else(|| DownloaderError::NotFoundFileName(url.to_string()))?\n            .last()\n            .ok_or_else(|| DownloaderError::NotFoundFileName(url.to_string()))\n            .map(|s| s.to_string())\n    }\n    async fn acquire_download_lock(&self, file_name: &String) -> Arc<Mutex<()>> {","sourceCodeStart":181,"sourceCodeEnd":217,"githubUrl":"https://github.com/zellij-org/zellij/blob/5cb5df5cce4e16c5d1c57c7c062e4a90a7823c41/zellij-utils/src/downloader.rs#L181-L217","documentation":"Error \"failed to spawn runtime for download task\" thrown in zellij-org/zellij.","triggerScenarios":"Occurs at zellij-utils/src/downloader.rs:199 when the operation fails: \"failed to spawn runtime for download task\". Currently there is no defensive handling preventing or contextualizing this failure before it surfaces.","commonSituations":"Typically resource exhaustion, invalid fd state, or platform-specific pty limitations.","solutions":["Check system resource limits (open files, processes) and the OS error attached to the failure.","Retry the operation; if persistent, report the OS error with a zellij issue."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"5cb5df5cce4e16c5d1c57c7c062e4a90a7823c41","analyzedAt":"2026-08-19T07:42:58.758Z","contentChangedAt":"2026-08-19T07:42:58.758Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}