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rust.missing_async_timeout

Stability Medium

Detects async operations that can wait indefinitely without timeout bounds.

Why It Matters

Missing timeouts:

Indefinite blocking — Operations never complete
Resource exhaustion — Connections held forever
Cascading failures — Stuck tasks affect other work

Example

// ❌ Before (no timeout)
async fn fetch_data() -> Result<Data, Error> {
    let response = client.get(url).send().await?;
    Ok(response.json().await?)
}

// ✅ After (with timeout)
use tokio::time::timeout;

async fn fetch_data() -> Result<Data, Error> {
    timeout(Duration::from_secs(30), async {
        let response = client.get(url).send().await?;
        Ok(response.json().await?)
    })
    .await
    .map_err(|_| Error::Timeout)?
}

What Unfault Detects

HTTP client calls without timeout
Database operations without bounds
Channel receives without timeout