🟠 High   ⏱ 5–30 min  Last verified: 19 May 2026
Affected versions: RHEL 10.0

📖 ~1 min read

Table of contents
  1. Problem Summary
  2. Symptoms
  3. Diagnostics
  4. Root Cause
  5. Primary Fix
  6. Verification
  7. Prevention
  8. Rollback
  9. Automation
  10. Command Reference
  11. Escalation
  12. Related Notes

Problem Summary

Crash dump capture is disabled unexpectedly after update.

Symptoms

systemctl status kdump reports failed reservation or inactive state.

Diagnostics

Check grub cmdline for crashkernel parameter and journalctl -u kdump.

Root Cause

crashkernel memory reservation missing or too small.

Primary Fix

Set appropriate crashkernel in GRUB, regenerate config, reboot.

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Illustrative mockup for rhel-10 — rhel10-b02-p39-1
Illustrative mockup — Progressive Robot — Illustrative mockup — Progressive Robot

Verification

Confirm kdump service active and kdumpctl showmem output valid.

Illustrative mockup for rhel-10 — rhel10-b02-p39-2
Illustrative mockup — Progressive Robot — Illustrative mockup — Progressive Robot

Prevention

Validate crashkernel after each kernel rollout.

Rollback

Revert to previous boot entry if reservation causes instability.

Automation

Use compliance checks for kdump enabled state.

Command Reference

grubby –info=ALL; systemctl enable –now kdump

Escalation

Attach boot cmdline and kdump journal logs.

Reserved memory requirements vary by workload and RAM size.

Related tutorial: View the step-by-step tutorial for rhel-10.

View all rhel-10 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

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