msgdiff seems to fail when running lmdb 0.9.26
msgdiff fails with the following error
File "./msgdiff.py", line 137, in <module>
main()
File "./msgdiff.py", line 118, in main
report = prepare_report(lmdb_, servers)
File "./msgdiff.py", line 81, in prepare_report
qdb = lmdb_.open_db(LMDB.QUERIES)
File "/home/simon/src/git/one.com/respdiff/respdiff/database.py", line 94, in open_db
db = self.env.open_db(key=dbname, create=create, **LMDB.DB_OPEN_DEFAULTS)
lmdb.InvalidParameterError: mdb_txn_begin: Invalid argument
Downgrading lmdb seems to solve the issue.