Affected versions: FreeBSD 12

πŸ“– ~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 drops to loader prompt and cannot continue normal boot.

Environment & Reproduction

Happens after manual edits to loader.conf or boot filesystem moves.

Root Cause Analysis

Configured kernel path does not match installed kernel location.

Quick Triage

List loader variables and verify boot partition accessibility.

Step-by-Step Diagnosis

Inspect loader settings and filesystem layout for path discrepancies.

Illustrative mockup for freebsd-12 β€” loader_prompt_diag
Loader prompt indicating missing kernel β€” Illustrative mockup β€” Progressive Robot

Solution – Primary Fix

Restore valid kernel path entries and revalidate boot configuration.

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Illustrative mockup for freebsd-12 β€” loader_prompt_fix
Correct loader and kernel path settings β€” Illustrative mockup β€” Progressive Robot

Solution – Alternative Approaches

Boot from previous environment and regenerate loader configuration.

Verification & Acceptance Criteria

Boot sequence reaches multi-user mode without loader interruption.

Rollback Plan

Use rescue media and restore last working boot configuration backup.

Prevention & Hardening

Track boot config in version control and validate before reboot.

Related to ZFS boot pool import and GPT partition labeling issues.

Related tutorial: View the step-by-step tutorial for FreeBSD 12.

View all FreeBSD 12 tutorials on the Tutorials Hub β†’

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

FreeBSD loader(8), loader.conf(5), and boot troubleshooting docs.

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