🟠 High   ⏱ 5–30 min  Last verified: 20 May 2026
Affected versions: Oracle Linux 10

📖 ~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

Kernel panic occurs but no vmcore is captured for post incident analysis.

Environment & Reproduction

Observed on hosts where crashkernel memory reservation is missing or too small.

systemctl status kdump
cat /proc/cmdline
grep crashkernel /etc/default/grub

Root Cause Analysis

Insufficient crash kernel reservation or invalid dump target prevents capture.

Quick Triage

Validate kdump service readiness and configured target path.

kdumpctl status
cat /etc/kdump.conf
ls -l /var/crash

Step-by-Step Diagnosis

Check crashkernel parameter and dump filesystem accessibility.

grubby --info=ALL | grep crashkernel
mount | grep /var/crash
journalctl -u kdump -n 80
Illustrative mockup for oracle-linux-10 — terminal_or_shell
kdump and crashkernel diagnostics — Illustrative mockup — Progressive Robot

Solution – Primary Fix

Set correct crashkernel value, rebuild boot config, and restart kdump.

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grubby --update-kernel=ALL --args='crashkernel=512M'
kdumpctl restart
kdumpctl status
Illustrative mockup for oracle-linux-10 — logs_or_journal
boot and kdump service logs — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

Redirect dumps to remote NFS or SSH target with tested connectivity.

grep -E 'nfs|ssh' /etc/kdump.conf

Verification & Acceptance Criteria

Kdump test path and service report ready state.

kdumpctl status
kdumpctl showmem

Rollback Plan

Remove crashkernel argument if it causes memory pressure issues.

grubby --update-kernel=ALL --remove-args='crashkernel=512M'
kdumpctl restart

Prevention & Hardening

Include kdump readiness checks in host acceptance tests.

systemctl is-enabled kdump
kdumpctl status

Related to bootloader misconfiguration and insufficient reserved memory.

Related tutorial: View the step-by-step tutorial for oracle-linux-10.

View all oracle-linux-10 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Oracle Linux kdump setup and crash analysis documentation.

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