Hi, I'm running FirebirdCS-2.1.2.18118-0 or FC8, suddenly yesturday
programs using the database started throwing errors like this one:

(this is from gbak)
internal gds software consistency check (decompression overran buffer
(179), file: sqz.cpp line: 222)

gfix gave

Number of record level errors : 4
Number of data page errors : 1
Number of index page errors : 3
Number of database page errors : 6

I did a backup and restore, which partially failed (fk indexes) which
I was able to correct by restoring with inactive indexes and removing
the data that was causing the problem, then I enabled the indexes.

What I need to understand is what caused this and how to avoid it
happening again. This system had been running for several weeks
without issue.