https://forums.freebsd.org/threads/emergency-extracted-over-9-1-etc-from-9-0-src-txz.39895/
Emergency: Extracted over 9.1 /etc, from 9.0 src.txz | The FreeBSD Forums
Soon afterwards, for usual commands as ls, mkdir, I would get the error 'Permission denied' as root. Before reboot, I've restored from /var/backups...
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https://forums.freebsd.org/tags/ports-111-distfiles-txz-xz/
ports 11.1 distfiles txz xz | The FreeBSD Forums
portsdistfilesxzfreebsdforums