What causes "external auth provider `{command}` IO error: {e}" in xai-org/grok-build?

Check system logs (dmesg/journalctl) for OOM kills or signals hitting the provider process.

external auth provider `{command}` IO error: {e}

Error message

external auth provider `{command}` IO error: {e}

What it means

wait_with_output() failed while reading the provider's stdout/stderr or waiting for exit; the io::Error is wrapped with this message. Spawn succeeded but the runtime failed to collect output — commonly the child was killed by a signal or an IO pipe error occurred.

Source

Thrown at crates/codegen/xai-grok-shell/src/auth/flow.rs:241

                        cb(trimmed);
                    }
                    Err(e) => {
                        tracing::warn!(error = %e, "auth: error reading provider stderr");
                        break;
                    }
                }
            }
        }))
    } else {
        None
    };
    let output = tokio::time::timeout(
        std::time::Duration::from_secs(300),
        child.wait_with_output(),
    )
    .await
    .map_err(|_| anyhow::anyhow!("external auth provider `{command}` timed out after 300s"))?
    .map_err(|e| anyhow::anyhow!("external auth provider `{command}` IO error: {e}"))?;
    if let Some(task) = stderr_task {
        let _ = task.await;
    }
    let mut auth = parse_output(&output)
        .map_err(|e| anyhow::anyhow!("external auth provider `{command}`: {e}"))?;
    let principal_policy =
        crate::auth::oidc::login_principal_policy(auth_manager.grok_com_config());
    crate::auth::oidc::enforce_login_principal(
        principal_policy.as_ref(),
        crate::auth::oidc::peek_access_token_principal_id(&auth.key).as_deref(),
    )?;
    match (over_stale_credential, auth_manager.current_or_expired()) {
        (true, Some(prev)) => auth.carry_user_profile_from(&prev),
        _ => auth_manager.enrich_auth_inline(&mut auth).await,
    }
    let auth = auth_manager
        .update(auth)
        .await

View on GitHub (pinned to bc7f02eddd)

Solutions

Check system logs (dmesg/journalctl) for OOM kills or signals hitting the provider process.
Run the provider command standalone and observe its exit behavior; fix the provider crash.
Remove outer wrappers (timeout, process-group killers) that SIGKILL the provider mid-run.
Retry the login; if transient, add resilience in the provider rather than the caller.

Defensive patterns

Strategy: retry

Validate before calling

// preflight: run the provider briefly and confirm it survives
provider_cmd --version || echo 'provider binary crashes or is misbuilt'

Try / catch

match run_auth_flow(...).await {
    Err(e) if e.to_string().contains("IO error") => {
        eprintln!("Provider died mid-run (signal/OOM?). Check dmesg and retry");
    }
    other => other?,
}

Prevention

Don't SIGKILL the provider with outer timeout wrappers
Watch for OOM kills when the provider allocates heavily
Test the provider binary standalone after each rebuild
Avoid sandbox profiles that block piped stdio

When it happens

Trigger: The provider process is killed (OOM, user signal, external timeout wrapper) while tokio waits; the process writes then dies in a way that yields an IO error on the piped stdout/stderr handles.

Common situations: OOM killer terminating the provider; an outer script sending SIGKILL to a process group; provider binary crashing after being spawned; sandboxed environments blocking pipe usage.

Related errors

AI-assisted analysis of xai-org/grok-build@bc7f02eddd (2026-08-31). Data as JSON: /api/errors/6778bae68834923d. Report an issue: GitHub.