{"record":{"id":"55d9504759b92747","repo":"Yeachan-Heo/oh-my-codex","slug":"failed-to-kill-tmux-pane-killtarget-killed-s","errorCode":null,"errorMessage":"failed to kill tmux pane ${killTarget}: ${killed.stderr}","messagePattern":"failed to kill tmux pane (.+?): (.+?)","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"src/team/tmux-session.ts","lineNumber":4028,"sourceCode":"  const initialTarget = await resolveTarget();\n  if (!initialTarget) return;\n  if (await isWorkerAliveAsync(sessionName, workerIndex, workerPaneId, expectedPanePid, expectedTeamOwnerId, hudPaneId, resolveTarget) !== 'alive') return;\n  await runTmuxAsync(['send-keys', '-t', initialTarget, 'C-c']);\n  await sleep(1000);\n\n  if (await isWorkerAliveAsync(sessionName, workerIndex, workerPaneId, expectedPanePid, expectedTeamOwnerId, hudPaneId, resolveTarget) === 'alive') {\n    const exitTarget = await resolveTarget();\n    if (exitTarget) {\n      await runTmuxAsync(['send-keys', '-t', exitTarget, 'C-d']);\n      await sleep(1000);\n    }\n  }\n\n  if (await isWorkerAliveAsync(sessionName, workerIndex, workerPaneId, expectedPanePid, expectedTeamOwnerId, hudPaneId, resolveTarget) === 'alive') {\n    const killTarget = await resolveTarget();\n    if (!killTarget) return;\n    const killed = await runTmuxAsync(['kill-pane', '-t', killTarget]);\n    if (!killed.ok) throw new Error(`failed to kill tmux pane ${killTarget}: ${killed.stderr}`);\n    const absence = await readExactPaneProof(killTarget);\n    if (absence.status === 'unavailable') throw new ExactPaneProofUnavailableError(absence);\n    if (absence.status !== 'gone') throw new Error(`tmux pane remains live after kill: ${killTarget}`);\n  }\n}\n\n\n// Explicit pane targets require frozen PID, canonical Team owner, and HUD\n// exclusion. A successful kill is only accepted after a fresh absence proof.\nexport function killWorkerByPaneId(\n  workerPaneId: string,\n  expectedPanePid?: number,\n  leaderPaneId?: string,\n  expectedTeamOwnerId?: string,\n  hudPaneId?: string,\n): void {\n  const expectedOwner = typeof expectedTeamOwnerId === 'string' ? expectedTeamOwnerId.trim() : '';\n  if (!hasExplicitWorkerPaneId(workerPaneId)","sourceCodeStart":4010,"sourceCodeEnd":4046,"githubUrl":"https://github.com/Yeachan-Heo/oh-my-codex/blob/3ad79a8a6fe6e95fdbb8c00e40716fffe4011ce2/src/team/tmux-session.ts#L4010-L4046","documentation":"Thrown when the tmux `kill-pane` command issued to terminate a worker pane exits non-zero; tmux's stderr is included. Additionally the follow-up liveness proof may reject (not shown here), but this specific message means the kill command itself failed — typically because the pane already disappeared or the target is malformed.","triggerScenarios":"Calling the worker-kill routine while the pane is concurrently closing (agent exits on its own), the session is already dead, or resolveTarget returns a stale/malformed target string at kill time.","commonSituations":"Race between worker process exit and orchestrator cleanup; kill issued during tmux server shutdown; double-kill from overlapping cleanup handlers; stale pane id from a previous session.","solutions":["Treat 'no such pane' / 'can't find session' stderr as success — the pane is already gone; skip or ignore","Re-check liveness (isWorkerAliveAsync) immediately before kill to shrink the race window","Serialize cleanup handlers so kill runs exactly once","Re-resolve the target right before killing instead of reusing a cached one"],"exampleFix":"// before\nconst killed = await runTmuxAsync(['kill-pane', '-t', target]);\nif (!killed.ok) throw new Error(killed.stderr);\n\n// after\nconst killed = await runTmuxAsync(['kill-pane', '-t', target]);\nif (!killed.ok && !/no such pane|can't find session/.test(killed.stderr)) {\n  throw new Error(killed.stderr);\n}","handlingStrategy":"try-catch","validationCode":"if ((await isWorkerAliveAsync(sessionName, idx, paneId)) !== 'alive') return; // nothing to kill","typeGuard":null,"tryCatchPattern":"try { await killWorkerPane(target); } catch (err) { if (!/no such pane|can't find session/.test(String(err))) throw err; }","preventionTips":["Treat already-gone panes as successfully killed","Serialize cleanup so kill-pane runs once","Re-resolve the target immediately before killing"],"tags":["tmux","kill-pane","cleanup","race-condition"],"backgroundTag":"tmux-pane-not-found","analyzedSha":"3ad79a8a6fe6e95fdbb8c00e40716fffe4011ce2","analyzedAt":"2026-08-27T22:18:39.783Z","schemaVersion":2},"datasetVersion":"2026-08-28T00:17:15.603Z"}