The windows buildbot occasionally fails with tracebacks like this:

======================================================================
ERROR: test01_badpointer (bsddb.test.test_misc.MiscTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File
"E:\cygwin\home\db3l\buildarea\2.6.bolen-windows\build\lib\bsddb\test\test_misc.py",
line 21, in test01_badpointer
    dbs = dbshelve.open(self.filename)
  File
"E:\cygwin\home\db3l\buildarea\2.6.bolen-windows\build\lib\bsddb\dbshelve.py",
line 106, in open
    d.open(filename, dbname, filetype, flags, mode)
  File
"E:\cygwin\home\db3l\buildarea\2.6.bolen-windows\build\lib\bsddb\dbshelve.py",
line 171, in open
    self.db.open(*args, **kwargs)
DBFileExistsError: (17, 'File exists -- __fop_file_setup:  Retry limit
(100) exceeded')

This also happens for several of the other test methods.