This seems related to the import behaviour changes in regrtest.

Re-running test 'test_posix' in verbose mode
test test_posix crashed -- <type 'exceptions.ImportError'>: No module
named pwd
Traceback (most recent call last):
  File "../lib/test/regrtest.py", line 569, in runtest_inner
    the_package = __import__(abstest, globals(), locals(), [])
  File
"E:\cygwin\home\db3l\buildarea\trunk.bolen-windows\build\lib\test\test_posix.py",
line 8, in <module>
    import pwd
ImportError: No module named pwd
Re-running test 'test_pty' in verbose mode
test test_pty crashed -- <type 'exceptions.ImportError'>: No module
named fcntl
Traceback (most recent call last):
  File "../lib/test/regrtest.py", line 569, in runtest_inner
    the_package = __import__(abstest, globals(), locals(), [])
  File
"E:\cygwin\home\db3l\buildarea\trunk.bolen-windows\build\lib\test\test_pty.py",
line 2, in <module>
    import fcntl
ImportError: No module named fcntl

http://www.python.org/dev/buildbot/trunk.stable/x86%20XP-4%20trunk/builds/2056/step-test/0