CentOS Stream 10 – Common Problem 123 – Diagnosis and Fix

📖 ~1 min read

Table of contents

1. Symptom & Impact
2. Environment & Reproduction
3. Root Cause Analysis
4. Quick Triage
5. Step-by-Step Diagnosis
6. Solution – Primary Fix
7. Solution – Alternative Approaches
8. Verification & Acceptance Criteria
9. Rollback Plan
10. Prevention & Hardening
11. Related Errors & Cross-Refs
12. References & Further Reading

Symptom & Impact

kdump.service fails because the crashkernel reservation is too small.

Environment & Reproduction

Common on hosts with large memory or vendor firmware quirks.

Root Cause Analysis

crashkernel= value cannot fit the kernel and target storage.

Quick Triage

Run kdumpctl status and inspect /var/log/messages for failures.

Step-by-Step Diagnosis

Verify reserved range with cat /proc/iomem and grep Crash.

Solution – Primary Fix

Update crashkernel value via grubby –update-kernel=ALL.

Solution – Alternative Approaches

Use crashkernel=auto with system overrides if available.

Verification & Acceptance Criteria

kdumpctl status reports kdump operational and test dump completes.

Rollback Plan

Restore previous crashkernel via grubby –remove-args if memory becomes scarce.

Prevention & Hardening

Validate kdump after each kernel and firmware upgrade.

Related Errors & Cross-Refs

Linked to grub2 entries and BLS snippets.

Related tutorial: View the step-by-step tutorial for centos-stream-10.

View all centos-stream-10 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

kexec-tools and kdump.conf manuals.