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PASSEDnetwork / monitoring_tool_crash
Network Monitoring Tool Failure — Nagios/PRTG Crash Loop
The primary network monitoring platform enters a crash loop after a database corruption event during a power fluctuation. All alerting stops, creating a blind spot where infrastructure failures go undetected. The secondary monitoring server was decommissioned last month.
Pattern
PROCESS_CRASH_LOOP
Severity
CRITICAL
Confidence
90%
Remediation
Remote Hands
Test Results
| Metric | Expected | Actual | Result |
|---|---|---|---|
| Pattern Recognition | PROCESS_CRASH_LOOP | PROCESS_CRASH_LOOP | |
| Severity Assessment | CRITICAL | CRITICAL | |
| Incident Correlation | Yes | 26 linked | |
| Cascade Escalation | N/A | No | |
| Remediation | — | Remote Hands — Corax contacts on-site support via call, email, or API |
Scenario Conditions
Nagios XI primary monitoring server. MySQL backend corrupted during power event. Service entering crash loop on startup. 400+ monitored hosts. No secondary monitoring. Last backup: 3 days ago.
Injected Error Messages (2)
Nagios XI process crash loop detected — nagios daemon exiting with segfault on startup, core dump generated at /var/nagios/core.12847, service restarting every 15 seconds, all 400+ host checks suspended, alerting completely offline
MySQL backend crash loop — InnoDB corruption detected on nagios.status_data table, mysqld_safe restarting mysqld in crash loop, crash loop count: 47 in last 10 minutes, recovery mode failing
Neural Engine Root Cause Analysis
The Nagios XI daemon is experiencing a segmentation fault during startup, causing it to crash immediately and enter a restart loop every 15 seconds. This segfault indicates memory corruption or invalid memory access, likely caused by corrupted configuration files, plugin issues, or system-level problems like memory corruption or missing dependencies. The core dump at /var/nagios/core.12847 contains the crash details, and with 400+ host checks suspended, this represents a complete monitoring infrastructure failure.
Remediation Plan
1. Stop the Nagios service to break the crash loop 2. Analyze the core dump using gdb to identify the exact crash location 3. Check Nagios configuration syntax with nagios -v 4. Review recent configuration changes or plugin updates 5. Check system resources (memory, disk space) and system logs 6. Restore from last known good configuration backup if corruption is found 7. If system-level issue, check for memory problems or missing dependencies 8. Restart service only after root cause is resolved
Tested: 2026-03-30Monitors: 2 | Incidents: 2Test ID: cmncjp9j703frobqeots18qyf