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Occurs repeatedly on AMD64 debian parallel.
======================================================================
FAIL: test_extractall (test.test_tarfile.MiscReadTest)
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Traceback (most recent call last):
 File "/var/autofs/net/homedir/home/martin.vonloewis/buildarea/3.x.loewis-parallel2/build/Lib/test/test_tarfile.py", line 331, in test_extractall
 self.assertEqual(tarinfo.mtime, os.path.getmtime(path))
AssertionError: 1041808783 != 1041808783.000001
======================================================================
FAIL: test_extractall (test.test_tarfile.GzipMiscReadTest)
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Traceback (most recent call last):
 File "/var/autofs/net/homedir/home/martin.vonloewis/buildarea/3.x.loewis-parallel2/build/Lib/test/test_tarfile.py", line 331, in test_extractall
 self.assertEqual(tarinfo.mtime, os.path.getmtime(path))
AssertionError: 1041808783 != 1041808783.000003
======================================================================
FAIL: test_extractall (test.test_tarfile.Bz2MiscReadTest)
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Traceback (most recent call last):
 File "/var/autofs/net/homedir/home/martin.vonloewis/buildarea/3.x.loewis-parallel2/build/Lib/test/test_tarfile.py", line 331, in test_extractall
 self.assertEqual(tarinfo.mtime, os.path.getmtime(path))
AssertionError: 1041808783 != 1041808783.000005
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Ran 230 tests in 6.681s
FAILED (failures=3)
test test_tarfile crashed -- <class 'OSError'>: [Errno 16] Device or resource busy: '/var/autofs/net/homedir/home/martin.vonloewis/buildarea/3.x.loewis-parallel2/build/build/test_python_21179/@test_21179_tmp/.nfs000000000004f3b30000060b'
Traceback (most recent call last):
 File "/var/autofs/net/homedir/home/martin.vonloewis/buildarea/3.x.loewis-parallel2/build/Lib/test/test_tarfile.py", line 1560, in test_main
 support.run_unittest(*tests)
 File "/var/autofs/net/homedir/home/martin.vonloewis/buildarea/3.x.loewis-parallel2/build/Lib/test/support.py", line 1078, in run_unittest
 _run_suite(suite)
 File "/var/autofs/net/homedir/home/martin.vonloewis/buildarea/3.x.loewis-parallel2/build/Lib/test/support.py", line 1061, in _run_suite
 raise TestFailed(err)
test.support.TestFailed: multiple errors occurred
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
 File "./Lib/test/regrtest.py", line 942, in runtest_inner
 File "/var/autofs/net/homedir/home/martin.vonloewis/buildarea/3.x.loewis-parallel2/build/Lib/test/test_tarfile.py", line 1563, in test_main
 shutil.rmtree(TEMPDIR)
 File "/var/autofs/net/homedir/home/martin.vonloewis/buildarea/3.x.loewis-parallel2/build/Lib/shutil.py", line 283, in rmtree
 onerror(os.remove, fullname, sys.exc_info())
 File "/var/autofs/net/homedir/home/martin.vonloewis/buildarea/3.x.loewis-parallel2/build/Lib/shutil.py", line 281, in rmtree
 os.remove(fullname)
OSError: [Errno 16] Device or resource busy: '/var/autofs/net/homedir/home/martin.vonloewis/buildarea/3.x.loewis-parallel2/build/build/test_python_21179/@test_21179_tmp/.nfs000000000004f3b30000060b'
http://www.python.org/dev/buildbot/builders/AMD64%20debian%20parallel%203.x/builds/94 

For the record, when compiling on this buildbot, there's the following error message:
make: Warning: File `Makefile' has modification time 4.7 s in the future
which seems to hint that the filesystem on the buildbot is slightly misbehaving, or at least doesn't have very reliable timestamps.

Yet another issue with the filesystem on the same buildbot: see issue 9772.