{"record":{"id":"f72cf2c1e9f57129","repo":"Hmbown/CodeWhale","slug":"coordination-same-process-handover-for-error","errorCode":null,"errorMessage":"{COORDINATION_SAME_PROCESS_HANDOVER} for {}: {error}","messagePattern":"\\{COORDINATION_SAME_PROCESS_HANDOVER\\} for \\{\\}: \\{error\\}","errorType":"exception","errorClass":"anyhow::Error","httpStatus":null,"severity":"error","filePath":"crates/tui/src/tools/subagent/mod.rs","lineNumber":3261,"sourceCode":"                    let _ = release_rx.recv();\n                }\n                Err(error) => {\n                    let _ = ready_tx.send(Err(error.to_string()));\n                }\n            }\n        });\n        match ready_rx.recv_timeout(Duration::from_secs(5)) {\n            Ok(Ok(())) => Ok(Self {\n                release: Some(release_tx),\n                thread: Some(thread),\n            }),\n            Ok(Err(error)) => {\n                let _ = thread.join();\n                let holder_pid = std::fs::read_to_string(&lock_path)\n                    .ok()\n                    .and_then(|contents| contents.trim().parse::<u32>().ok());\n                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}\",","sourceCodeStart":3243,"sourceCodeEnd":3279,"githubUrl":"https://github.com/Hmbown/CodeWhale/blob/433685b2024e7bc4c99e1e2e326bcad39b4d9d65/crates/tui/src/tools/subagent/mod.rs#L3243-L3279","documentation":"Delegated coordination for a state root is guarded by a cross-process lock file. When acquiring it fails, the code reads the lock file to learn the holder's PID; if that PID is this very process, the conflict is internal (a same-process handover deadlock/misordering) and this distinct error is thrown instead of blaming another Codewhale instance.","triggerScenarios":"Taking delegated coordination for state_root fails, and the lock file's stored PID parses to the current process ID — i.e. this process already holds (or stale-held) the coordination lock.","commonSituations":"Nested or re-entrant coordination acquisition in one process; a stale lock file left by a previous crashed instance that coincidentally reuses the current PID; spawning parallel coordination threads in the same process without releasing the lock.","solutions":["Check for re-entrant acquisition of the same coordination lock within this process and serialize those paths","Delete the stale lock file under the state root if no coordination is actually active, then retry","Investigate why the inner acquisition failed — the wrapped {error} names it (e.g. lock timeout or flock failure)","Restart the process to clear in-memory lock state"],"exampleFix":"// before: same process re-acquires the lock it already holds\nacquire_coordination_lock(&lock_path).await?;\n// after: skip if this process already holds it\nif !is_held_by_current_process(&lock_path) {\n    acquire_coordination_lock(&lock_path).await?;\n}","handlingStrategy":"retry","validationCode":"let holder = std::fs::read_to_string(&lock_path).ok()\n    .and_then(|c| c.trim().parse::<u32>().ok());\nif holder == Some(std::process::id()) {\n    // already held by this process: skip acquisition or reuse the existing guard\n}","typeGuard":"fn lock_held_by_current_process(lock_path: &Path) -> bool {\n    std::fs::read_to_string(lock_path).ok()\n        .and_then(|c| c.trim().parse::<u32>().ok())\n        == Some(std::process::id())\n}","tryCatchPattern":"match try_acquire_coordination(&lock_path) {\n    Ok(guard) => guard,\n    Err(e) if lock_held_by_current_process(&lock_path) => reuse_in_process_guard(),\n    Err(e) => return Err(anyhow!(\"coordination lock unavailable: {e}\")),\n}","preventionTips":["Serialize all coordination acquisitions within one process behind a single in-process mutex","Clean up stale lock files on startup when the recorded PID is dead","Never leave the coordination lock held across re-entrant call paths","Use lock files with O_EXCL creation and PID content for diagnosis"],"tags":["coordination","locking","process"],"backgroundTag":"address-already-in-use","analyzedSha":"433685b2024e7bc4c99e1e2e326bcad39b4d9d65","analyzedAt":"2026-09-15T12:24:24.634Z","contentChangedAt":"2026-09-15T12:24:24.634Z","schemaVersion":2},"datasetVersion":"2026-09-22T01:17:13.364Z"}