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When running the test suite on Linux 3.2.9-1, I get the following error on the test_os suite:
test test_os crashed -- Traceback (most recent call last):
 File "/home/benhayden/Documents/cpython/Lib/test/regrtest.py", line 1229, in runtest_inner
 the_package = __import__(abstest, globals(), locals(), [])
 File "/home/benhayden/Documents/cpython/Lib/test/test_os.py", line 1767, in <module>
 @unittest.skipUnless(supports_extended_attributes(),
 File "/home/benhayden/Documents/cpython/Lib/test/test_os.py", line 1754, in supports_extended_attributes
 os.fsetxattr(fp.fileno(), b"user.test", b"")
OSError: [Errno 61] No data available
I don't know the best way to handle this error, but instead of raising it, I just let the decorator return False. This allowed test_os to finish (and finish successfully) on my machine.
Once again, I don't really know what ENODATA might mean, so I just tried the first thing that worked for me.

Perhaps any errors that occur during supports_extended_attributes should cause it to just return false?

That was my thought, but again, I didn't really know if it was 'safe' to snuff the OSError all together. This patch just returns False if any OSError is raised.

New changeset ada766b07686 by Benjamin Peterson in branch 'default':
all OSErrors should indicate there are no extended attributes (closes #14358)
http://hg.python.org/cpython/rev/ada766b07686