Two days in, the use of 9.2 was totally stopped by a 100% full root directory, a situation which is essentially unrecoverable for all but super-experts.
/ is a 5GB partition which returned 7.2 GB to du -s / (probably due to the inclusion of /proc).
Investigation of this partition from another 9.1 partition showed this to be caused by 103,900 files of the form /root/<a word>.nnnnn having beeen created by root in the /root directory, all of which were of zero length except two. The reserved-to-root space for recovery operations in / was also all consumed.
I used 9.1 KDE from a booted 9.1 LM partition to delete them all from the 9.2 mounted partition. They were all deleted, but left KDE in a hung condition, which had to be killed with the read target icon.
This condition also occurred from time to time in 9.1 but I found it undiagnosable, since whatever was reserving copious wads of space on / left no file directory entries, hidden or otherwise.
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