#34930: Parallel tests fail on Python 3.11+ and MacOS.
-------------------------------------+-------------------------------------
Reporter: Matt Hegarty | Owner: nobody
Type: Bug | Status: closed
Component: Testing framework | Version: 4.2
Severity: Normal | Resolution: needsinfo
Keywords: pickle | Triage Stage:
_contextvars.Context _contextvars | Unreviewed
Context |
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Changes (by Natalia Bidart):
* status: new => closed
* resolution: => needsinfo
Comment:
I can confirm I also get the reported error with the given reproducer,
running on a Manjaro system (amd64):
{{{
Traceback (most recent call last):
File "/home/nessita/fellowship/django/tests/runtests.py", line 783, in
<module>
failures = django_tests(
^^^^^^^^^^^^^
File "/home/nessita/fellowship/django/tests/runtests.py", line 421, in
django_tests
failures = test_runner.run_tests(test_labels)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/nessita/fellowship/django/django/test/runner.py", line 1068,
in run_tests
result = self.run_suite(suite)
^^^^^^^^^^^^^^^^^^^^^
File "/home/nessita/fellowship/django/django/test/runner.py", line 995,
in run_suite
return runner.run(suite)
^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/unittest/runner.py", line 217, in run
test(result)
File "/usr/lib/python3.11/unittest/suite.py", line 84, in __call__
return self.run(*args, **kwds)
^^^^^^^^^^^^^^^^^^^^^^^
File "/home/nessita/fellowship/django/django/test/runner.py", line 541,
in run
subsuite_index, events = test_results.next(timeout=0.1)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/multiprocessing/pool.py", line 873, in next
raise value
File "/usr/lib/python3.11/multiprocessing/pool.py", line 540, in
_handle_tasks
put(task)
File "/usr/lib/python3.11/multiprocessing/connection.py", line 205, in
send
self._send_bytes(_ForkingPickler.dumps(obj))
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/multiprocessing/reduction.py", line 51, in
dumps
cls(buf, protocol).dump(obj)
TypeError: cannot pickle '_contextvars.Context' object
Exception ignored in: <function Pool.__del__ at 0x7f16d6958680>
Traceback (most recent call last):
File "/usr/lib/python3.11/multiprocessing/pool.py", line 268, in __del__
ResourceWarning: unclosed running multiprocessing pool
<multiprocessing.pool.Pool state=RUN pool_size=4>
}}}
What I don't have clarity is whether this ever worked, I have bisected up
to the adding of ASGI support (commit
`a415ce70bef6d91036b00dd2c8544aed7aeeaaed`) and the given tests are still
failing. I have also checked out `stable/4.0.x` and the tests are still
not working.
Matt, can you please explain how Django is at fault here? It seems that
`IsolatedAsyncioTestCase` hasn't been (ever?) supported?
--
Ticket URL: <https://code.djangoproject.com/ticket/34930#comment:4>
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