round 1: parked; umount -f (takes ~13s)...
Tue Sep  8 12:12:49 UTC 2026
round 1: umount rc=0 (expect 0); firing fstatfs
round 1: guest still up? ghost says:
[860] fd parked; waiting for fire signal
[860] fd 6 recovered; fstatfs -> deref dead nullfs mnt_data
fstatfs returned errno=16 (no panic)
done
=== driver rc=0
Tue Sep  8 12:13:07 UTC 2026