biomejs/biome · error

failed to spawn console thread

Error message

failed to spawn console thread

What it means

Error "failed to spawn console thread" thrown in biomejs/biome.

Source

Thrown at crates/biome_cli/src/runner/crawler.rs:57

    fn crawl(
        execution: &dyn Execution,
        workspace: &dyn Workspace,
        fs: &dyn FileSystem,
        project_key: ProjectKey,
        use_server: bool,
        inputs: Vec<CrawlPath>,
        collector: Self::Collector,
        max_diagnostics: u32,
        diagnostic_level: Severity,
    ) -> Result<Output, CliDiagnostic> {
        let (interner, recv_files) = PathInterner::new();
        let (sender, receiver) = unbounded();

        let (duration, evaluated_paths) = thread::scope(|s| {
            let handler = thread::Builder::new()
                .name(String::from("biome::console"))
                .spawn_scoped(s, || collector.run(receiver, recv_files, execution))
                .expect("failed to spawn console thread");

            let ctx = CrawlerOptions::new(
                fs,
                workspace,
                project_key,
                use_server,
                interner,
                sender,
                execution,
                max_diagnostics,
                diagnostic_level,
            );
            let (elapsed, evaluated_paths) = Self::crawl_inputs(fs, inputs, &ctx);

            if use_server {
                for changed_file in ctx.take_changed_files() {
                    let result = workspace.change_file(ChangeFileParams {
                        project_key,

View on GitHub (pinned to 405dedb0ff)

Solutions

1. Check system thread limits (ulimit, cgroup constraints) if spawning the console thread fails.
2. Reduce concurrent thread usage before starting the crawler.

Example fix

// Inspect the attached io::Error source for OS-level spawn failure details

When it happens

Trigger: Thrown at crates/biome_cli/src/runner/crawler.rs:57 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of biomejs/biome@405dedb0ff (2026-08-20). Data as JSON: /api/errors/cdd9ced49394a737. Report an issue: GitHub.