Neil Schemenauer was running regrtest with -r and got a segfault. He whittled it down to running just -u bsddb test_logging test_bsddb3 This was confirmed on Win2K, Win98, and some version of Linux. He also discovered that the problem went away if test_logging.py's locale.setlocale(locale.LC_ALL, '') was commented out. I've since found that the problem persists if + All the suite.addTest() calls in bsddb/test/test_basics.py are commented out except for suite.addTest(unittest.makeSuite(BTreeMultiDBTestCase)) and + All the entries in test_bsddb3.py's test_modules list are commented out except for 'test_basics', Then running yields this output: test_bsddb3 test01_GetsAndPuts (bsddb.test.test_basics.BTreeMultiDBTestCase) ... ok test02_DictionaryMethods (bsddb.test.test_basics.BTreeMultiDBTestCase) ... ok test03_SimpleCursorStuff (bsddb.test.test_basics.BTreeMultiDBTestCase) ... ok test04_PartialGetAndPut (bsddb.test.test_basics.BTreeMultiDBTestCase) ... ok test05_GetSize (bsddb.test.test_basics.BTreeMultiDBTestCase) ... ok test06_Truncate (bsddb.test.test_basics.BTreeMultiDBTestCase) ... ok test09_MultiDB (bsddb.test.test_basics.BTreeMultiDBTestCase) ... FAIL and that's when the crash happens. I don't have time to dig into this more. Looks like a good one, though!