🟠 High   ⏱ 5–30 min  Last verified: 20 May 2026
Affected versions: FreeBSD 14

📖 ~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

Applications fail I/O on mounted NFS paths with stale handle errors and retry storms.

Environment & Reproduction

Common after NFS server rollback, export recreation, or inode identity changes.

mount -t nfs
nfsstat -m
df -h

Root Cause Analysis

Client holds file handles no longer valid after server-side object identity changed.

Quick Triage

Identify impacted mount and active process handles.

fstat | grep  | head -n 40
showmount -e

Step-by-Step Diagnosis

Inspect server export state and client mount options for compatibility.

cat /etc/fstab | grep nfs
cat /etc/exports 2>/dev/null || true
nfsstat -c
Illustrative mockup for freebsd-14 — terminal_or_console
Diagnosis commands for post 166 — Illustrative mockup — Progressive Robot

Solution – Primary Fix

Gracefully stop dependent process, unmount stale path, and remount clean export.

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service  stop
umount -f 
mount 
service  start
Illustrative mockup for freebsd-14 — log_or_dashboard
Fix validation evidence for post 166 — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

Apply automount with soft retries for non-critical paths to reduce outage duration.

sysrc autofs_enable=YES
service automount start

Verification & Acceptance Criteria

No stale handle errors in logs and read/write checks pass under load.

touch /.health && rm -f /.health
dmesg -a | grep -i nfs | tail -n 40

Rollback Plan

Revert to previous export version or alternate mount target if integrity concerns persist.

mount -t nfs :/

Prevention & Hardening

Coordinate snapshot rollback procedures with NFS client remount orchestration.

Can present alongside lockd timeouts and RPC version mismatches.

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 NFS administration chapter and nfsstat manual.

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