This seem to have caused several errors that have manifested on the release of 3.10.0rc2:

test test_multiprocessing_fork failed -- Traceback (most recent call last):
  File "/tmp/tmpu30qfjpr/installation/lib/python3.10/unittest/mock.py", line 1239, in _dot_lookup
    return getattr(thing, comp)
AttributeError: module 'multiprocessing' has no attribute 'shared_memory'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/tmp/tmpu30qfjpr/installation/lib/python3.10/test/_test_multiprocessing.py", line 3818, in test_shared_memory_basics
    with unittest.mock.patch(
  File "/tmp/tmpu30qfjpr/installation/lib/python3.10/unittest/mock.py", line 1422, in __enter__
    self.target = self.getter()
  File "/tmp/tmpu30qfjpr/installation/lib/python3.10/unittest/mock.py", line 1609, in <lambda>
    getter = lambda: _importer(target)
  File "/tmp/tmpu30qfjpr/installation/lib/python3.10/unittest/mock.py", line 1252, in _importer
    thing = _dot_lookup(thing, comp, import_path)
  File "/tmp/tmpu30qfjpr/installation/lib/python3.10/unittest/mock.py", line 1242, in _dot_lookup
    return getattr(thing, comp)
AttributeError: module 'multiprocessing' has no attribute 'shared_memory'

0:09:11 load avg: 0.71 [231/427/1] test_multiprocessing_forkserver -- test_multiprocessing_fork failed (1 error) in 1 min 11 sec
test test_multiprocessing_forkserver failed -- Traceback (most recent call last):
  File "/tmp/tmpu30qfjpr/installation/lib/python3.10/unittest/mock.py", line 1239, in _dot_lookup
    return getattr(thing, comp)
AttributeError: module 'multiprocessing' has no attribute 'shared_memory'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/tmp/tmpu30qfjpr/installation/lib/python3.10/test/_test_multiprocessing.py", line 3818, in test_shared_memory_basics
    with unittest.mock.patch(
  File "/tmp/tmpu30qfjpr/installation/lib/python3.10/unittest/mock.py", line 1422, in __enter__
    self.target = self.getter()
  File "/tmp/tmpu30qfjpr/installation/lib/python3.10/unittest/mock.py", line 1609, in <lambda>
    getter = lambda: _importer(target)
  File "/tmp/tmpu30qfjpr/installation/lib/python3.10/unittest/mock.py", line 1252, in _importer
    thing = _dot_lookup(thing, comp, import_path)
  File "/tmp/tmpu30qfjpr/installation/lib/python3.10/unittest/mock.py", line 1242, in _dot_lookup
    return getattr(thing, comp)
AttributeError: module 'multiprocessing' has no attribute 'shared_memory'

0:11:11 load avg: 0.93 [232/427/2] test_multiprocessing_main_handling -- test_multiprocessing_forkserver failed (1 error) in 2 min
0:11:18 load avg: 1.09 [233/427/2] test_multiprocessing_spawn
test test_multiprocessing_spawn failed -- Traceback (most recent call last):
  File "/tmp/tmpu30qfjpr/installation/lib/python3.10/unittest/mock.py", line 1239, in _dot_lookup
    return getattr(thing, comp)
AttributeError: module 'multiprocessing' has no attribute 'shared_memory'