📖 ~1 min read
Table of contents
Symptom & Impact
Services fail because required kernel modules refuse to load.
Environment & Reproduction
Common after kernel updates with third-party modules installed.
kldload Root Cause Analysis
Module ABI does not match the active kernel due to missed rebuild or reinstall.
Quick Triage
Collect running kernel version and module inventory.
uname -a && kldstatStep-by-Step Diagnosis
Inspect stale artifacts in /boot/modules and package provenance.
ls -lah /boot/modules
Solution – Primary Fix
Reinstall or rebuild module package against current kernel then reboot.
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sudo pkg install -f && sudo shutdown -r now
Solution – Alternative Approaches
Temporarily boot previous kernel until rebuild maintenance window is available.
Verification & Acceptance Criteria
Modules load successfully and dependent services remain stable.
Rollback Plan
Boot prior environment and restore known-good module set.
Prevention & Hardening
Add module rebuild checks to post-update automation.
Related Errors & Cross-Refs
Related to boot panics from incompatible storage or network modules.
Related tutorial: View the step-by-step tutorial for freebsd-14.
View all freebsd-14 tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
FreeBSD kernel module compatibility and update practices.
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