can1357/oh-my-pi · error

Could not create log directories

Error message

Could not create log directories: ${logDirs.stderr.trim()}

What it means

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.

Solutions

1. Check the embedded stderr in the message to identify the exact mkdir failure cause
2. Verify the VM image includes mkdir (busybox/coreutils) and / is writable
3. Free disk space or expand the guest volume if the error indicates ENOSPC
4. Pre-bake the /logs directories into the VM image or snapshot so mkdir is a no-op

Example fix

// before
await vm.exec("mkdir -p /logs/agent /logs/verifier");
// after: bake into image or use a writable location
await vm.exec("mkdir -p /tmp/logs/agent /tmp/logs/verifier");

const probe = await vm.exec("mkdir -p /logs/agent /logs/verifier");
if (probe.exitCode !== 0) {
  const df = await vm.exec("df -h /");
  throw new Error(`Guest mkdir failed: ${probe.stderr.trim()}\n${df.stdout}`);
}

try {
  await runTrial(opts);
} catch (err) {
  if (String(err.message).startsWith("Could not create log directories")) {
    // recreate the VM with a writable, disk-healthy image
    await recreateVmAndRetry(opts);
  }
  throw err;
}

When it happens

Trigger: 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.

Common situations: Running trials against minimal VM/container images without coreutils at /bin/mkdir; mounting / read-only; guest disk quota exhausted after many trial runs.

Related errors

• Could not create /opt/omp
• Could not make omp executable
• {0}
• and are the same file
• 1

AI-assisted analysis of can1357/oh-my-pi@9690622007 (2026-08-31). Data as JSON: /api/errors/73e9ff6ba672fa07. Report an issue: GitHub.

Appendix: source

Thrown at packages/metaharness/src/tb/trial.ts:136

			TrialVm.start({
				config: opts.vmon,
				image: opts.task.image,
				name: vmName,
				cpus: opts.task.cpus,
				memoryMb: opts.task.memoryMb,
				storageMb: opts.task.storageMb,
				timeoutSec: Math.ceil(deadlineMs / 1_000),
				env: opts.task.environmentEnv,
			}),
		);
		checkDeadline();

		opts.log?.("connect gateway");
		const gatewayUrl = await beforeDeadline(vm.startGateway(opts.gateway.url));
		opts.log?.("install agent");
		const entrypoint = await beforeDeadline(installAgent(vm, opts.binaries, { ...opts.gateway, url: gatewayUrl }));
		const logDirs = await vm.exec("mkdir -p /logs/agent /logs/verifier");
		if (logDirs.exitCode !== 0) throw new Error(`Could not create log directories: ${logDirs.stderr.trim()}`);
		checkDeadline();

		const { provider, model } = modelParts(opts.model);
		client = new RpcClient({
			spawn: vm.rpcTransport(entrypoint, opts.task.agentTimeoutSec + 30),
			provider,
			model,
			args: ["--no-session", "--auto-approve", "--tools", TERMINAL_BENCH_TOOLS],
		});
		let turns = 0;
		const unsubscribe = client.onEvent(event => {
			if (event.type === "turn_start") turns++;
		});
		let agentCollectionError: string | null = null;
		const agentStartedAt = performance.now();
		try {
			await client.start();
			opts.log?.("prompt");

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