{"record":{"id":"73e9ff6ba672fa07","repo":"can1357/oh-my-pi","slug":"could-not-create-log-directories-logdirs-stderr","errorCode":null,"errorMessage":"Could not create log directories: ${logDirs.stderr.trim()}","messagePattern":"Could not create log directories: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"packages/metaharness/src/tb/trial.ts","lineNumber":136,"sourceCode":"\t\t\tTrialVm.start({\n\t\t\t\tconfig: opts.vmon,\n\t\t\t\timage: opts.task.image,\n\t\t\t\tname: vmName,\n\t\t\t\tcpus: opts.task.cpus,\n\t\t\t\tmemoryMb: opts.task.memoryMb,\n\t\t\t\tstorageMb: opts.task.storageMb,\n\t\t\t\ttimeoutSec: Math.ceil(deadlineMs / 1_000),\n\t\t\t\tenv: opts.task.environmentEnv,\n\t\t\t}),\n\t\t);\n\t\tcheckDeadline();\n\n\t\topts.log?.(\"connect gateway\");\n\t\tconst gatewayUrl = await beforeDeadline(vm.startGateway(opts.gateway.url));\n\t\topts.log?.(\"install agent\");\n\t\tconst entrypoint = await beforeDeadline(installAgent(vm, opts.binaries, { ...opts.gateway, url: gatewayUrl }));\n\t\tconst logDirs = await vm.exec(\"mkdir -p /logs/agent /logs/verifier\");\n\t\tif (logDirs.exitCode !== 0) throw new Error(`Could not create log directories: ${logDirs.stderr.trim()}`);\n\t\tcheckDeadline();\n\n\t\tconst { provider, model } = modelParts(opts.model);\n\t\tclient = new RpcClient({\n\t\t\tspawn: vm.rpcTransport(entrypoint, opts.task.agentTimeoutSec + 30),\n\t\t\tprovider,\n\t\t\tmodel,\n\t\t\targs: [\"--no-session\", \"--auto-approve\", \"--tools\", TERMINAL_BENCH_TOOLS],\n\t\t});\n\t\tlet turns = 0;\n\t\tconst unsubscribe = client.onEvent(event => {\n\t\t\tif (event.type === \"turn_start\") turns++;\n\t\t});\n\t\tlet agentCollectionError: string | null = null;\n\t\tconst agentStartedAt = performance.now();\n\t\ttry {\n\t\t\tawait client.start();\n\t\t\topts.log?.(\"prompt\");","sourceCodeStart":118,"sourceCodeEnd":154,"githubUrl":"https://github.com/can1357/oh-my-pi/blob/969062200754ea02cfac922e5ebb8c608c079e15/packages/metaharness/src/tb/trial.ts#L118-L154","documentation":"runTrial in the trial-bench harness creates /logs/agent and /logs/verifier inside the VM before starting the agent. This error is thrown when the `mkdir -p /logs/agent /logs/verifier` command run via vm.exec returns a non-zero exit code; the command's trimmed stderr is embedded so the developer can see why mkdir failed.","triggerScenarios":"Calling runTrial when the VM guest filesystem cannot create /logs: read-only root filesystem, full disk, missing mkdir binary in the guest image, or the exec transport itself failing to run the command.","commonSituations":"Running trials against minimal VM/container images without coreutils at /bin/mkdir; mounting / read-only; guest disk quota exhausted after many trial runs.","solutions":["Check the embedded stderr in the message to identify the exact mkdir failure cause","Verify the VM image includes mkdir (busybox/coreutils) and / is writable","Free disk space or expand the guest volume if the error indicates ENOSPC","Pre-bake the /logs directories into the VM image or snapshot so mkdir is a no-op"],"exampleFix":"// before\nawait vm.exec(\"mkdir -p /logs/agent /logs/verifier\");\n// after: bake into image or use a writable location\nawait vm.exec(\"mkdir -p /tmp/logs/agent /tmp/logs/verifier\");","handlingStrategy":"try-catch","validationCode":"const probe = await vm.exec(\"mkdir -p /logs/agent /logs/verifier\");\nif (probe.exitCode !== 0) {\n  const df = await vm.exec(\"df -h /\");\n  throw new Error(`Guest mkdir failed: ${probe.stderr.trim()}\\n${df.stdout}`);\n}","typeGuard":null,"tryCatchPattern":"try {\n  await runTrial(opts);\n} catch (err) {\n  if (String(err.message).startsWith(\"Could not create log directories\")) {\n    // recreate the VM with a writable, disk-healthy image\n    await recreateVmAndRetry(opts);\n  }\n  throw err;\n}","preventionTips":["Bake /logs/agent and /logs/verifier into the VM image","Monitor guest disk usage between trial runs","Use VM images with coreutils/busybox installed"],"tags":["vm","filesystem","setup"],"backgroundTag":"guest-command-failed","analyzedSha":"969062200754ea02cfac922e5ebb8c608c079e15","analyzedAt":"2026-08-31T10:29:35.737Z","schemaVersion":2},"datasetVersion":"2026-08-31T14:17:45.589Z"}