Back to All Scenarios
PASSEDcache / hung_process
Varnish 7.5 Process Hung — Not Responding to Health Checks on Ubuntu 22.04 LTS
Varnish 7.5 process is alive but completely unresponsive. Health checks timing out. Thread/connection pool exhausted. Requires restart.
Pattern
TIMEOUT
Severity
HIGH
Confidence
60%
Remediation
Auto-Heal
Test Results
| Metric | Expected | Actual | Result |
|---|---|---|---|
| Pattern Recognition | TIMEOUT | TIMEOUT | |
| Severity Assessment | HIGH | HIGH | |
| Incident Correlation | N/A | None | |
| Cascade Escalation | N/A | No | |
| Remediation | — | Auto-Heal — Corax resolves autonomously |
Scenario Conditions
Ubuntu 22.04 LTS. Varnish 7.5 PID 1558 running but not responding. All worker threads blocked. Health endpoint timing out. Last successful response 5 minutes ago.
Injected Error Messages (1)
Varnish 7.5 hung on Ubuntu 22.04 LTS — process alive (PID 1558) but timeout on all requests, ETIMEDOUT after 30s, all worker threads blocked, last response 5 minutes ago
Neural Engine Root Cause Analysis
Request timed out — service may be under heavy load, experiencing network issues, or behind a slow upstream.
Remediation Plan
Check server resource utilization (CPU/memory/disk). Investigate network path. Consider scaling if load-related.
Tested: 2026-04-02Monitors: 1 | Incidents: 1Test ID: cmnhnq3yg056ylig7w5i5bb7o