{"record":{"id":"ba07c6671a1e017f","repo":"Hmbown/CodeWhale","slug":"coordination-lock-timeout-marker-for-error","errorCode":null,"errorMessage":"{COORDINATION_LOCK_TIMEOUT_MARKER} for {}: {error}","messagePattern":"\\{COORDINATION_LOCK_TIMEOUT_MARKER\\} for \\{\\}: \\{error\\}","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/tui/src/tools/subagent/mod.rs","lineNumber":3473,"sourceCode":"                if holder_pid == Some(std::process::id()) {\n                    Err(anyhow!(\n                        \"{COORDINATION_SAME_PROCESS_HANDOVER} for {}: {error}\",\n                        state_root.display()\n                    ))\n                } else {\n                    Err(anyhow!(\n                        \"another Codewhale process{} owns delegated coordination for {}: {error}\",\n                        holder_pid\n                            .map(|pid| format!(\" (pid {pid})\"))\n                            .unwrap_or_default(),\n                        state_root.display()\n                    ))\n                }\n            }\n            Err(error) => {\n                drop(release_tx);\n                let _ = thread.join();\n                Err(anyhow!(\n                    \"{COORDINATION_LOCK_TIMEOUT_MARKER} for {}: {error}\",\n                    state_root.display()\n                ))\n            }\n        }\n    }\n}\n\nimpl Drop for CoordinationProcessLock {\n    fn drop(&mut self) {\n        self.release.take();\n        if let Some(thread) = self.thread.take() {\n            let _ = thread.join();\n        }\n    }\n}\n\npub struct SubAgentManager {","sourceCodeStart":3455,"sourceCodeEnd":3491,"githubUrl":"https://github.com/Hmbown/CodeWhale/blob/73e0f67d83c59909b571efdfc88c4bc28c309cb1/crates/tui/src/tools/subagent/mod.rs#L3455-L3491","documentation":"The delegated coordination acquisition runs the locking attempt on a worker thread with a timeout signaled via a channel (release_tx). If the worker errors out or the wait times out (receiver gets Err), the library joins the thread and throws this marker error naming the state_root and the underlying error, telling the caller the coordination lock could not be acquired in time.","triggerScenarios":"Invoking a delegated sub-agent operation while another process holds the coordination lock past the acquisition timeout, or the worker thread itself returned an error (permission problem, IO failure on the lock file).","commonSituations":"Long-running agent session in another window holding coordination; a hung/stuck worker thread; disk or permission errors on the state directory under load.","solutions":["Retry after the competing process finishes; the underlying error text names the real cause.","Increase patience: close other Codewhale sessions using the same state_root before retrying.","Check filesystem permissions on state_root (the worker may be failing to open/create the lock file).","If the holder is dead, clear the stale lock file and retry."],"exampleFix":"// before: immediate acquisition attempt under contention\nlet handle = acquire_delegated(state_root)?;\n// after: wait for prior holder to release, with backoff\nwait_for_coordination_release(state_root, Duration::from_secs(30));\nlet handle = acquire_delegated(state_root)?;","handlingStrategy":"retry","validationCode":"// probe lock availability with a short-lived attempt before the real call\nfn coordination_available(state_root: &Path) -> bool {\n    try_acquire_coordination_with_timeout(state_root, Duration::from_millis(100)).is_ok()\n}","typeGuard":null,"tryCatchPattern":"match acquire_delegated_coordination(state_root) {\n    Err(e) if e.to_string().contains(\"lock timeout\") || e.to_string().contains(\"LOCK_TIMEOUT\") => {\n        tokio::time::sleep(Duration::from_secs(5)).await;\n        acquire_delegated_coordination(state_root)\n    }\n    r => r,\n}","preventionTips":["Close competing Codewhale sessions sharing the same state_root before launching delegated work.","Apply exponential backoff on retries instead of hammering the lock.","Verify filesystem permissions on the state directory so worker threads do not fail on IO."],"tags":["concurrency","timeout","locking"],"backgroundTag":"lock-acquisition-timeout","analyzedSha":"73e0f67d83c59909b571efdfc88c4bc28c309cb1","analyzedAt":"2026-09-22T01:30:00.501Z","contentChangedAt":"2026-09-22T01:30:00.501Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}