test failure in testHomeDirectoryJob

while testing https://code.launchpad.net/~mbp/launchpad/881237-dkim-error/+merge/80413

FAILURE: canonical.launchpad.utilities.ftests.test_gpghandler.TestImportKeyRing.testHomeDirectoryJob (subunit.RemotedTestCase)
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_StringException: Text attachment: traceback
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Traceback (most recent call last):
_StringException: librarian-log: {{{
2011-10-26 09:24:28+0530 [-] Log opened.
2011-10-26 09:24:28+0530 [-] twistd 11.1.0pre1 (/usr/bin/python2.6 2.6.5) starting up.
2011-10-26 09:24:28+0530 [-] reactor class: twisted.internet.pollreactor.PollReactor.
2011-10-26 09:24:28+0530 [-] FileUploadFactory starting on 49979
2011-10-26 09:24:28+0530 [-] Starting factory <canonical.librarian.libraryprotocol.FileUploadFactory instance at 0x4572a70>
2011-10-26 09:24:28+0530 [-] Site starting on 39966
2011-10-26 09:24:28+0530 [-] Starting factory <twisted.web.server.Site instance at 0x4561b90>
2011-10-26 09:24:28+0530 [-] FileUploadFactory starting on 59769
2011-10-26 09:24:28+0530 [-] Starting factory <canonical.librarian.libraryprotocol.FileUploadFactory instance at 0x4561680>
2011-10-26 09:24:28+0530 [-] Site starting on 41482
2011-10-26 09:24:28+0530 [-] Starting factory <twisted.web.server.Site instance at 0x4561b00>
2011-10-26 09:24:28+0530 [-] Not using upstream librarian
2011-10-26 09:24:28+0530 [-] daemon ready!
}}}

Traceback (most recent call last):
 File "/var/launchpad/test/lib/canonical/launchpad/utilities/ftests/test_gpghandler.py", line 173, in testHomeDirectoryJob
   self.assertTrue(now <= floor(os.path.getmtime(fname)))
AssertionError

that code looks inherently dangerous