Again, the doctests gets interrupted with an error OSError: [Errno 24] Too 
many open files. Is it related to Python 3.8?

...
----------------------------------------------------------------------
sage -t --long --random-seed=0 src/sage/graphs/generic_graph.py  # 2 
doctests failed
sage -t --long --random-seed=0 src/sage/databases/oeis.py  # 1 doctest 
failed
sage -t --long --random-seed=0 src/sage/symbolic/integration/integral.py  # 
1 doctest failed
sage -t --long --random-seed=0 src/sage/graphs/graph.py  # 3 doctests failed
sage -t --long --random-seed=0 src/sage/symbolic/integration/external.py  # 
1 doctest failed
sage -t --long --random-seed=0 src/doc/en/constructions/linear_algebra.rst  
# 1 doctest failed
sage -t --long --random-seed=0 
src/doc/en/constructions/interface_issues.rst  # 1 doctest failed
sage -t --long --random-seed=0 src/sage/interfaces/octave.py  # 3 doctests 
failed
sage -t --long --random-seed=0 
src/sage/combinat/designs/incidence_structures.py  # 1 doctest failed
sage -t --long --random-seed=0 src/doc/en/developer/coding_in_other.rst  # 
1 doctest failed
Doctests interrupted: 1862/4204 files tested
----------------------------------------------------------------------
Total time for all tests: 2372.2 seconds
    cpu time: 12523.8 seconds
    cumulative wall time: 13826.7 seconds
Traceback (most recent call last):
  File "/home/slabbe/GitBox/sage/src/bin/sage-runtests", line 182, in 
<module>
    err = DC.run()
  File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/control.py",
 
line 1230, in run
    self.run_doctests()
  File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/control.py",
 
line 931, in run_doctests
    self.dispatcher.dispatch()
  File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 2052, in dispatch
    self.parallel_dispatch()
  File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 1947, in parallel_dispatch
    w.start()  # This might take some time
  File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 2219, in start
    super(DocTestWorker, self).start()
  File "/usr/lib/python3.8/multiprocessing/process.py", line 121, in start
    self._popen = self._Popen(self)
  File "/usr/lib/python3.8/multiprocessing/context.py", line 224, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "/usr/lib/python3.8/multiprocessing/context.py", line 276, in _Popen
    return Popen(process_obj)
  File "/usr/lib/python3.8/multiprocessing/popen_fork.py", line 19, in 
__init__
    self._launch(process_obj)
  File "/usr/lib/python3.8/multiprocessing/popen_fork.py", line 69, in 
_launch
    child_r, parent_w = os.pipe()
OSError: [Errno 24] Too many open files

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