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1. Segmentation fault in Berkeley DB txn_abort().  When the 'xdelta2'
application fails in some way it aborts the current transaction, and
the database is known to crash during this process.  For example:

$ ./xdelta2 create D
$ ./xdelta2 register D A
$ ./xdelta2 register D A
dbfs.c:882: Key already exists
Segmentation fault (core dumped)

2. This software needs more documentation.