Boot Loader Prompt Appears Instead of Normal Boot

📖 ~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

System halts at loader prompt or loops before kernel starts.

Environment & Reproduction

Invalid loader.conf tunables, missing kernel path, or broken boot environment.

Root Cause Analysis

At loader prompt, list variables and attempt manual boot to isolate misconfiguration.

Quick Triage

Boot with defaults, then remove recent risky tunables from loader configuration.

Step-by-Step Diagnosis

Use boot -s and inspect /boot/loader.conf from single-user mode.

Solution – Primary Fix

Check /boot/loader.conf and /boot/loader.conf.local for invalid entries.

Solution – Alternative Approaches

Restore known-good loader settings, ensure kernel files exist, and update boot blocks if needed.

Verification & Acceptance Criteria

Reboot normally and confirm consistent unattended boot completion.

Rollback Plan

Test new tunables in staging and apply one change at a time.

Prevention & Hardening

Select previous boot environment if available and revert loader edits.

Related Errors & Cross-Refs

Escalate for suspected filesystem corruption or repeated bootloader crashes.

Related tutorial: View the step-by-step tutorial for freebsd-15.

View all freebsd-15 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

beadm list; mount -u /; vi /boot/loader.conf; nextboot -D