lib/lp/services/profile/profiling.txt fails rarely/intermittently in parallel tests

I tried to duplicate this locally both in isolation and with the tests before it in worker 1 (http://pastebin.ubuntu.com/1036036/) and could not dupe. It smells like a timing issue.

======================================================================
FAILURE: lib/lp/services/profile/profiling.txt
worker ID: worker-1
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Traceback (most recent call last):
  File "/usr/lib/python2.6/unittest.py", line 279, in run
    testMethod()
  File "/usr/lib/python2.6/doctest.py", line 2152, in runTest
    raise self.failureException(self.format_failure(new.getvalue()))
AssertionError: Failed doctest test for profiling.txt
  File "lib/lp/services/profile/profiling.txt", line 0

----------------------------------------------------------------------
File "lib/lp/services/profile/profiling.txt", line 36, in profiling.txt
Failed example:
    PageTestLayer.setUp()
Exception raised:
    Traceback (most recent call last):
      File "/usr/lib/python2.6/doctest.py", line 1248, in __run
        compileflags, 1) in test.globs
      File "<doctest profiling.txt[7]>", line 1, in <module>
        PageTestLayer.setUp()
      File "/var/lib/buildbot/slaves/slave/lucid-devel/build/lib/lp/services/testing/profiled.py", line 30, in profiled_func
        return func(cls, *args, **kw)
      File "/var/lib/buildbot/slaves/slave/lucid-devel/build/lib/lp/testing/layers.py", line 1545, in setUp
        file_handler = logging.FileHandler('logs/pagetests-access.log', 'w')
      File "/usr/lib/python2.6/logging/__init__.py", line 819, in __init__
        StreamHandler.__init__(self, self._open())
      File "/usr/lib/python2.6/logging/__init__.py", line 838, in _open
        stream = open(self.baseFilename, self.mode)
    IOError: [Errno 2] No such file or directory: '/var/lib/buildbot/slaves/slave/lucid-devel/build/logs/pagetests-access.log'
----------------------------------------------------------------------
File "lib/lp/services/profile/profiling.txt", line 53, in profiling.txt
Failed example:
    profile_count > 0
Differences (ndiff with -expected +actual):
    - True
    + False
----------------------------------------------------------------------
File "lib/lp/services/profile/profiling.txt", line 61, in profiling.txt
Failed example:
    len(PageTestLayer.profiler.getstats()) > profile_count
Differences (ndiff with -expected +actual):
    - True
    + False
----------------------------------------------------------------------
File "lib/lp/services/profile/profiling.txt", line 66, in profiling.txt
Failed example:
    PageTestLayer.tearDown()
Exception raised:
    Traceback (most recent call last):
      File "/usr/lib/python2.6/doctest.py", line 1248, in __run
        compileflags, 1) in test.globs
      File "<doctest profiling.txt[20]>", line 1, in <module>
        PageTestLayer.tearDown()
      File "/var/lib/buildbot/slaves/slave/lucid-devel/build/lib/lp/services/testing/profiled.py", line 30, in profiled_func
        return func(cls, *args, **kw)
      File "/var/lib/buildbot/slaves/slave/lucid-devel/build/lib/lp/testing/layers.py", line 1574, in tearDown
        PageTestLayer.orig__call__)
    AttributeError: type object 'PageTestLayer' has no attribute 'orig__call__'
----------------------------------------------------------------------
File "lib/lp/services/profile/profiling.txt", line 68, in profiling.txt
Failed example:
    stats = pstats.Stats(pagetests_profile)
Exception raised:
    Traceback (most recent call last):
      File "/usr/lib/python2.6/doctest.py", line 1248, in __run
        compileflags, 1) in test.globs
      File "<doctest profiling.txt[22]>", line 1, in <module>
        stats = pstats.Stats(pagetests_profile)
      File "/usr/lib/python2.6/pstats.py", line 92, in __init__
        self.init(arg)
      File "/usr/lib/python2.6/pstats.py", line 106, in init
        self.load_stats(arg)
      File "/usr/lib/python2.6/pstats.py", line 120, in load_stats
        f = open(arg, 'rb')
    IOError: [Errno 2] No such file or directory: '/tmp/pagetests_profile2Egnw5/pagetests.prof'
----------------------------------------------------------------------
File "lib/lp/services/profile/profiling.txt", line 69, in profiling.txt
Failed example:
    os.remove(pagetests_profile)
Exception raised:
    Traceback (most recent call last):
      File "/usr/lib/python2.6/doctest.py", line 1248, in __run
        compileflags, 1) in test.globs
      File "<doctest profiling.txt[23]>", line 1, in <module>
        os.remove(pagetests_profile)
    OSError: [Errno 2] No such file or directory: '/tmp/pagetests_profile2Egnw5/pagetests.prof'