Hmbown/CodeWhale · error · anyhow::Error

Thread already has an active turn

Error message

Thread already has an active turn

What it means

start_turn's engine preflight found the thread already has an active turn. Threads execute one turn at a time; this fires when a second concurrent start (or a steering race) arrives before the first turn completes.

Source

Thrown at crates/tui/src/runtime_threads.rs:5933

                    req.permission_posture.as_deref(),
                    req.auto_approve,
                )?
            } else {
                RuntimePolicyProjection::from_persisted(
                    &thread.mode,
                    thread.permission_posture.as_deref(),
                    thread.auto_approve,
                )
            };
        let mode = policy.mode;
        let engine = self.ensure_engine_loaded(&thread).await?;

        let client_preflight_required = {
            let active = self.active.lock().await;
            if let Some(active_thread) = active.engines.get(thread_id)
                && active_thread.active_turn.is_some()
            {
                bail!("Thread already has an active turn");
            }
            active
                .engines
                .get(thread_id)
                .is_none_or(|state| state.client_preflight_required)
        };

        // Resolve the concrete provider/model before persisting a turn. Auto
        // routing can fail, and such a failure must not leave a zombie
        // in-progress record behind.
        let requested_model = req.model.as_deref().unwrap_or(&thread.model).to_string();
        let auto_model = requested_model.trim().eq_ignore_ascii_case("auto");
        let cfg_snapshot = self.config.read().clone();
        let identity = self.provider_identity_for_thread(&cfg_snapshot, &thread)?;
        let mut thread_config = cfg_snapshot.clone();
        thread_config.scope_to_provider_identity(&identity);
        let verbosity = thread_config.verbosity.clone();
        let reasoning_preference = thread_config

View on GitHub (pinned to 0c42157ee5)

Solutions

1. Wait for the active turn to finish
2. Or interrupt it before starting a new one

When it happens

Trigger: Thrown at crates/tui/src/runtime_threads.rs:5933 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Hmbown/CodeWhale@0c42157ee5 (2026-08-20). Data as JSON: /api/errors/c4981557be20dfd9. Report an issue: GitHub.