🟠 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

Host responsiveness degrades and watchdog warnings appear in kernel logs.

Environment & Reproduction

Appears during sustained CPU saturation with specific workloads.

uptime
mpstat -P ALL 1 5
journalctl -k | grep -i 'soft lockup'

Root Cause Analysis

Long running kernel or driver paths can starve watchdog scheduling under pressure.

Quick Triage

Capture CPU, interrupt, and top process behavior.

top -b -n 1 | head -n 30
cat /proc/interrupts | head
perf top --stdio --timeout 5000

Step-by-Step Diagnosis

Correlate lockup stack traces with workload events.

journalctl -k --since '1 hour ago' | grep -i lockup -n
cat /proc/sys/kernel/watchdog_thresh
Illustrative mockup for oracle-linux-10 — terminal_or_shell
CPU pressure and lockup diagnostics — Illustrative mockup — Progressive Robot

Solution – Primary Fix

Apply latest kernel updates and reduce offending workload concurrency.

Still having issues? Our Server Management team can diagnose and resolve this for you. Get in touch for a free consultation.

dnf upgrade -y kernel
sysctl -w kernel.watchdog_thresh=20
reboot
Illustrative mockup for oracle-linux-10 — logs_or_journal
kernel soft lockup warnings — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

Pin workload threads and isolate critical CPUs.

tuned-adm profile throughput-performance
cat /sys/devices/system/cpu/isolated

Verification & Acceptance Criteria

No new lockup warnings and response latency improves.

journalctl -k --since '30 min ago' | grep -i lockup || true
vmstat 1 5

Rollback Plan

Revert kernel and sysctl changes if regressions occur.

grubby --set-default /boot/vmlinuz-previous
sysctl -w kernel.watchdog_thresh=10

Prevention & Hardening

Baseline CPU saturation alerts and capacity limits for heavy jobs.

Automate patch management and compliance across your fleet with our DevOps services.

sar -u 1 5

Can coincide with IRQ imbalance and storage driver stalls.

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 kernel performance and watchdog diagnostics docs.

Need Expert Help?

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