{"record":{"id":"83de35510fe30d9e","repo":"emilk/egui","slug":"failed-to-spawn-egui-inspection-connection-thread","errorCode":null,"errorMessage":"failed to spawn egui_inspection connection thread","messagePattern":"failed to spawn egui_inspection connection thread","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/egui_inspection/src/plugin.rs","lineNumber":398,"sourceCode":"        .spawn(move || {\n            for stream in listener.incoming() {\n                let Ok(stream) = stream else { continue };\n                let ctx = ctx.clone();\n                std::thread::Builder::new()\n                    .name(\"egui_inspection_conn\".into())\n                    .spawn(move || {\n                        if let Err(err) = serve_connection(stream, &ctx) {\n                            log::warn!(\"egui_inspection: connection ended: {err}\");\n                        }\n                    })\n                    .expect(\"failed to spawn egui_inspection connection thread\");\n            }\n        })?;\n    Ok(())\n}\n\n/// Connection handler: write the handshake, then read framed requests, submit each to the\n/// plugin via the context, and write the framed response back. Returns once the client\n/// disconnects.\n///\n/// # Errors\n/// On any socket I/O failure.\n#[cfg(not(target_arch = \"wasm32\"))]\nfn serve_connection(stream: std::net::TcpStream, ctx: &Context) -> std::io::Result<()> {\n    use crate::protocol::{read_message, write_handshake, write_message};\n\n    let mut reader = std::io::BufReader::new(stream.try_clone()?);\n    let mut writer = std::io::BufWriter::new(stream);\n\n    // Identify ourselves and our protocol version before any framed messages.\n    write_handshake(&mut writer)?;\n\n    loop {\n        let req: Request = match read_message(&mut reader) {\n            Ok(req) => req,\n            Err(err) if err.kind() == std::io::ErrorKind::UnexpectedEof => return Ok(()), // client gone","sourceCodeStart":380,"sourceCodeEnd":416,"githubUrl":"https://github.com/emilk/egui/blob/8fb03c9ae9a6bf1ffa602dfba51ed575f2655975/crates/egui_inspection/src/plugin.rs#L380-L416","documentation":"Error \"failed to spawn egui_inspection connection thread\" thrown in emilk/egui.","triggerScenarios":"Thrown at crates/egui_inspection/src/plugin.rs:380 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["The inspection connection thread failed to spawn (resource exhaustion): limit concurrent inspection connections or check OS thread limits."],"exampleFix":"// Accept connections on a single listener thread and reuse it instead of spawning per connection.","handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"8fb03c9ae9a6bf1ffa602dfba51ed575f2655975","analyzedAt":"2026-08-19T12:39:57.743Z","contentChangedAt":"2026-08-19T12:39:57.743Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}