PASSEDcache / fd_exhaustion

Redis 7.2 File Descriptor Limit Reached on Ubuntu 22.04 LTS

Redis 7.2 has exhausted its file descriptor limit. Cannot accept new connections or open new files. Service functionality severely degraded.

Pattern

CONNECTION_REFUSED

Severity

CRITICAL

Confidence

68%

Remediation

Auto-Heal

Test Results

Metric	Expected	Actual
Pattern Recognition	CONNECTION_REFUSED	CONNECTION_REFUSED
Severity Assessment	HIGH	CRITICAL
Incident Correlation	N/A	None
Cascade Escalation	N/A	No
Remediation	—	Auto-Heal — Corax resolves autonomously

Scenario Conditions

Ubuntu 22.04 LTS. Redis 7.2 at 57440/57448 file descriptors. Connection leak detected. ulimit -n set to 57448 (default, not tuned for production).

Injected Error Messages (1)

Redis 7.2 on Ubuntu 22.04 LTS — 57440/57448 FDs used, 'Too many open files', connection refused on new requests, redis-server leaking file descriptors at 88/min

Neural Engine Root Cause Analysis

Connection refused — service is likely crashed or not listening on the expected port.

Remediation Plan

Restart the target service. If recurring, check for memory leaks or crash loops.

Improvements Applied

Severity: CRITICAL (expected HIGH)

Tested: 2026-04-02Monitors: 1 | Incidents: 1Test ID: cmnhnpy3r04jilig7c0b42drc