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PASSEDqueue / port_conflict
Apache Kafka 3.7 Failed to Bind Port 9092 — Already in Use on Ubuntu 24.04 LTS
Apache Kafka 3.7 cannot start because another process is already using port 9092. Service is in failed state.
Pattern
PROCESS_CRASH_LOOP
Expected: CONNECTION_REFUSED
Severity
HIGH
Confidence
72%
Remediation
Auto-Heal
Test Results
| Metric | Expected | Actual | Result |
|---|---|---|---|
| Pattern Recognition | CONNECTION_REFUSED | PROCESS_CRASH_LOOP | |
| Severity Assessment | HIGH | HIGH | |
| Incident Correlation | N/A | None | |
| Cascade Escalation | N/A | No | |
| Remediation | — | Auto-Heal — Corax resolves autonomously |
Scenario Conditions
Ubuntu 24.04 LTS. Apache Kafka 3.7 configured to listen on port 9092. Another process (PID 4080) already bound to that port. Service start fails with EADDRINUSE.
Injected Error Messages (1)
kafka EADDRINUSE on Ubuntu 24.04 LTS — port 9092 already in use by PID 4080, Apache Kafka 3.7 connection refused on port 9092, service in crash loop, cannot start
Neural Engine Root Cause Analysis
Process crash loop detected — a service is repeatedly crashing and restarting, failing to reach a stable running state. This indicates a persistent issue such as a missing dependency, corrupted configuration, incompatible library version, memory corruption, or an unhandled exception that occurs during startup. In Kubernetes environments, this manifests as CrashLoopBackOff with exponentially increasing restart delays.
Remediation Plan
1. Check service logs immediately before each crash for the error message or stack trace.
2. Look for core dumps in /var/crash/ or the configured core dump location.
3. Verify all dependencies (config files, environment variables, database connectivity) are available.
4. Roll back to the last known working version if the crash started after a deployment.
5. For segfaults, check for library version mismatches or corrupted binaries — reinstall the package.
Improvements Applied
- Pattern classified as PROCESS_CRASH_LOOP (expected CONNECTION_REFUSED)
Tested: 2026-04-02Monitors: 1 | Incidents: 1Test ID: cmnhnpodt03ivlig7mf1qttk3