I have the following failure:

./sage -t src/sage/rings/integer.pyx
too many failed tests, not using stored timings
Running doctests with ID 2015-12-31-11-59-48-9f43f0a3.
Git branch: develop
Using --optional=mpir,python2,sage
Doctesting 1 file.
sage -t src/sage/rings/integer.pyx
**********************************************************************
File "src/sage/rings/integer.pyx", line 2622, in 
sage.rings.integer.Integer.divisors
Failed example:
    6.divisors()
Exception raised:
    Traceback (most recent call last):
      File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py",
 
line 496, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py",
 
line 858, in compile_and_execute
        exec(compiled, globs)
      File "<doctest sage.rings.integer.Integer.divisors[1]>", line 1, in 
<module>
        Integer(6).divisors()
      File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/display_manager.py",
 
line 745, in displayhook
        plain_text, rich_output = self._rich_output_formatter(obj, dict())
      File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/display_manager.py",
 
line 610, in _rich_output_formatter
        plain_text = self._backend.plain_text_formatter(obj, 
**rich_repr_kwds)
      File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/backend_base.py",
 
line 305, in plain_text_formatter
        plain_text = self._apply_pretty_printer(SagePrettyPrinter, obj)
      File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/backend_base.py",
 
line 250, in _apply_pretty_printer
        printer.pretty(obj)
      File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/display/pretty_print.py",
 
line 147, in pretty
        ok = representation(obj, self, cycle)
      File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/display/fancy_repr.py",
 
line 157, in __call__
        pretty_repr(obj, p, cycle)
      File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/IPython/lib/pretty.py",
 
line 550, in inner
        p.text(',')
      File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/IPython/lib/pretty.py",
 
line 211, in text
        self.output.write(obj)
      File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python/StringIO.py", 
line 213, in write
        _complain_ifclosed(self.closed)
      File "sage/ext/interrupt/interrupt.pyx", line 204, in 
sage.ext.interrupt.interrupt.sage_python_check_interrupt 
(/64bitdev/storage/sage-git_develop/sage/src/build/cythonized/sage/ext/interrupt/interrupt.c:1904)
        sig_check()
      File "sage/ext/interrupt/interrupt.pyx", line 91, in 
sage.ext.interrupt.interrupt.sig_raise_exception 
(/64bitdev/storage/sage-git_develop/sage/src/build/cythonized/sage/ext/interrupt/interrupt.c:970)
        raise AlarmInterrupt
    AlarmInterrupt
**********************************************************************
1 item had failures:
   1 of  21 in sage.rings.integer.Integer.divisors
    [1055 tests, 1 failure, 11.65 s]
----------------------------------------------------------------------
sage -t src/sage/rings/integer.pyx  # 1 doctest failed
----------------------------------------------------------------------
Total time for all tests: 12.2 seconds
    cpu time: 5.2 seconds
    cumulative wall time: 11.6 seconds

The failure is not always the same. Sometimes the failed example is 
'6.divisors()' and sometimes it's '28.divisors()`. And on other tries 
something else fails in a quite nasty fashion.

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