📖 ~1 min read
Table of contents
Symptom & Impact
CPU saturation from one service degrades latency and starves neighboring processes on shared hosts.
Environment & Reproduction
Appears after configuration changes, malformed input loops, or dependency failures causing rapid retries.
Root Cause Analysis
Service enters tight loop or expensive code path without backoff, driving persistent high CPU usage.
Quick Triage
Identify offending unit quickly, capture runtime stack clues, and protect critical workloads from starvation.
Step-by-Step Diagnosis
Inspect unit restart history, profile process behavior, and examine recent config or binary changes.
Solution – Primary Fix
Apply corrected configuration, add restart backoff, and set systemd resource limits where appropriate.
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Solution – Alternative Approaches
Scale out service instances, isolate workload cgroups, or downgrade to previously stable release.
Verification & Acceptance Criteria
CPU utilization normalizes and service-level metrics remain within expected thresholds over time.
Rollback Plan
Restore prior unit file and package version if tuning changes reduce functionality or throughput.
Prevention & Hardening
Add health checks and anomaly alerts for restart storms and sustained per-service CPU spikes.
Related Errors & Cross-Refs
Link memory leak and OOM cases plus relevant Ubuntu service management tutorial.
Related tutorial: View the step-by-step tutorial for Ubuntu 18.04 LTS.
View all Ubuntu 18.04 LTS tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Consult systemd.unit docs, Linux performance tooling references, and Ubuntu operations guides.
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