In an extremely rare situation when using c-tree Server's background flush feature, the server could terminate with an unhandled exception in the internal background cache flush logic.
Workaround: Disable the background flush buckets by adding these options to ctsrvr.cfg:
NONTRAN_DATA_FLUSH_BUCKETS 0
NONTRAN_INDEX_FLUSH_BUCKETS 0
TRAN_DATA_FLUSH_BUCKETS 0
TRAN_INDEX_FLUSH_BUCKETS 0
The buckets are optional (although they provide a histogram of the distribution of updates, the flush threads can operate normally without them).
The logic has been modified to eliminate this problem.