CI: Windows PY38 build RuntimeError: can't start new thread
I'm seeing this build fail a lot with low-level-looking errors, e.g.

```
FATAL ERROR: Committing semi space failed. Allocation failed - process out of memory
```

```
INTERNALERROR>   File "C:\Miniconda\envs\pandas-dev\lib\site-packages\_pytest\main.py", line 257, in wrap_session
INTERNALERROR>     session.exitstatus = doit(config, session) or 0
INTERNALERROR>   File "C:\Miniconda\envs\pandas-dev\lib\site-packages\_pytest\main.py", line 313, in _main
INTERNALERROR>     config.hook.pytest_runtestloop(session=session)
INTERNALERROR>   File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\hooks.py", line 286, in __call__
INTERNALERROR>     return self._hookexec(self, self.get_hookimpls(), kwargs)
INTERNALERROR>   File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\manager.py", line 93, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook, methods, kwargs)
INTERNALERROR>   File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\manager.py", line 84, in <lambda>
INTERNALERROR>     self._inner_hookexec = lambda hook, methods, kwargs: hook.multicall(
INTERNALERROR>   File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\callers.py", line 208, in _multicall
INTERNALERROR>     return outcome.get_result()
INTERNALERROR>   File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\callers.py", line 80, in get_result
  File "C:\Miniconda\envs\pandas-dev\Scripts\pytest-script.py", line 10, in <module>
    sys.exit(main())
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\_pytest\config\__init__.py", line 164, in main
    ret = config.hook.pytest_cmdline_main(
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\hooks.py", line 286, in __call__
    return self._hookexec(self, self.get_hookimpls(), kwargs)
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\manager.py", line 93, in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\manager.py", line 84, in <lambda>
    self._inner_hookexec = lambda hook, methods, kwargs: hook.multicall(
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\callers.py", line 208, in _multicall
    return outcome.get_result()
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\callers.py", line 80, in get_result
    raise ex[1].with_traceback(ex[2])
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\callers.py", line 187, in _multicall
    res = hook_impl.function(*args)
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\_pytest\main.py", line 306, in pytest_cmdline_main
    return wrap_session(config, _main)
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\_pytest\main.py", line 294, in wrap_session
    config.hook.pytest_sessionfinish(
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\hooks.py", line 286, in __call__
    return self._hookexec(self, self.get_hookimpls(), kwargs)
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\manager.py", line 93, in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\manager.py", line 84, in <lambda>
    self._inner_hookexec = lambda hook, methods, kwargs: hook.multicall(
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\callers.py", line 203, in _multicall
    gen.send(outcome)
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\_pytest\terminal.py", line 794, in pytest_sessionfinish
    outcome.get_result()
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\callers.py", line 80, in get_result
    raise ex[1].with_traceback(ex[2])
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\callers.py", line 187, in _multicall
    res = hook_impl.function(*args)
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\xdist\dsession.py", line 86, in pytest_sessionfinish
    nm.teardown_nodes()
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\xdist\workermanage.py", line 78, in teardown_nodes
    self.group.terminate(self.EXIT_TIMEOUT)
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\execnet\multi.py", line 215, in terminate
    safe_terminate(
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\execnet\multi.py", line 308, in safe_terminate
    reply = workerpool.spawn(termkill, termfunc, killfunc)
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\execnet\gateway_base.py", line 315, in spawn
    self.execmodel.start(self._perform_spawn, (reply,))
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\execnet\gateway_base.py", line 93, in exec_start
    self._start_new_thread(func, args)
RuntimeError: can't start new thread
```


```
INTERNALERROR>   File "C:\Miniconda\envs\pandas-dev\lib\site-packages\_pytest\main.py", line 257, in wrap_session
INTERNALERROR>     session.exitstatus = doit(config, session) or 0
INTERNALERROR>   File "C:\Miniconda\envs\pandas-dev\lib\site-packages\_pytest\main.py", line 313, in _main
INTERNALERROR>     config.hook.pytest_runtestloop(session=session)
INTERNALERROR>   File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\hooks.py", line 286, in __call__
INTERNALERROR>     return self._hookexec(self, self.get_hookimpls(), kwargs)
INTERNALERROR>   File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\manager.py", line 93, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook, methods, kwargs)
INTERNALERROR>   File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\manager.py", line 84, in <lambda>
INTERNALERROR>     self._inner_hookexec = lambda hook, methods, kwargs: hook.multicall(
INTERNALERROR>   File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\callers.py", line 208, in _multicall
INTERNALERROR>     return outcome.get_result()
INTERNALERROR>   File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\callers.py", line 80, in get_result
INTERNALERROR>     raise ex[1].with_traceback(ex[2])
INTERNALERROR>   File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\callers.py", line 187, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>   File "C:\Miniconda\envs\pandas-dev\lib\site-packages\xdist\dsession.py", line 112, in pytest_runtestloop
INTERNALERROR>     self.loop_once()
INTERNALERROR>   File "C:\Miniconda\envs\pandas-dev\lib\site-packages\xdist\dsession.py", line 135, in loop_once
INTERNALERROR>     call(**kwargs)
INTERNALERROR>   File "C:\Miniconda\envs\pandas-dev\lib\site-packages\xdist\dsession.py", line 174, in worker_workerfinished
INTERNALERROR>     assert not crashitem, (crashitem, node)
INTERNALERROR> AssertionError: ('pandas/tests/plotting/test_frame.py::TestDataFramePlots::test_hist_weights[weights0]', <WorkerController gw1>)
INTERNALERROR> assert not 'pandas/tests/plotting/test_frame.py::TestDataFramePlots::test_hist_weights[weights0]'
```

```
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.....s........................s....s....xs......s....s......s......s..............xs............s....................s..............s...............s.........s...x.........s............ss........xs..........ss..s................s...................s................s...........s...............s..x..................sx.......s.......s............xx..xxxxxxxx.x...x...................s.......................................................................xx.....................................s...........................................................................s.s......s..................s..s.s.x.....x....s.....s..s..x....x....s..s....sx..x...............................................................................................................................................................................................................................................................................................................................................sss................................................................s........s................................................ss.........................................ss.....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................s..................................................................................................................................................................................................................................ss..ss....s.....s.ss.sssss.s.s...............................................................s....................................................................................................................................................................................................x.....x...........................x...................x..............x...................x.................................................................................................................................................................s....................................................................................................................................................................................................................x...........................................................................s...............................................................x..........x...........................s................s............................s..........s.............................................................................s................s.......................................s.s.....................................x..........................s..................................................................................x............................s....................................................................ssss..............................................................................................................................................................................................................FF..................................................................................................................................................Fx..................................................s..................................................................................................................................s..s..s.......s..s.s.sss......................................................................................................Windows fatal exception: 
stack overflow

Thread 0x00001184 (most recent call first):
<no Python frame>

Current thread 0x00001f04 (most recent call first):
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\execnet\gateway_base.py", line 180 in Event
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\execnet\gateway_base.py", line 197 in __init__
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\execnet\gateway_base.py", line 309 in spawn
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\execnet\multi.py", line 300 in termkill
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\execnet\gateway_base.py", line 220 in run
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\execnet\gateway_base.py", line 285 in _perform_spawn

Thread 0x00001fd8 (most recent call first):
<no Python frame>

Thread 0x00000eb0 (most recent call first):
<no Python frame>


  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\execnet\gateway_base.py", line 285 in _perform_spawn

Thread 0x000011e0 (most recent call first):
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\execnet\gateway_base.py", line 400 in read
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\execnet\gateway_base.py", line 432 in from_io
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\execnet\gateway_base.py", line 967 in _thread_receiver
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\execnet\gateway_base.py", line 220 in run
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\execnet\gateway_base.py", line 285 in _perform_spawn

Thread 0x00001fd8 (most recent call first):
  File "C:\Miniconda\envs\pandas-dev\lib\threading.py", line 302 in wait
  File "C:\Miniconda\envs\pandas-dev\lib\threading.py", line 558 in wait
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\execnet\gateway_base.py", line 213 in waitfinish
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\execnet\gateway_base.py", line 206 in get
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\execnet\multi.py", line 311 in safe_terminate
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\execnet\multi.py", line 215 in terminate
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\xdist\workermanage.py", line 78 in teardown_nodes
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\xdist\dsession.py", line 86 in pytest_sessionfinish
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\callers.py", line 187 in _multicall
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\manager.py", line 84 in <lambda>
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\manager.py", line 93 in _hookexec
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\hooks.py", line 286 in __call__
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\_pytest\main.py", line 294 in wrap_session
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\_pytest\main.py", line 306 in pytest_cmdline_main
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\callers.py", line 187 in _multicall
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\manager.py", line 84 in <lambda>
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\manager.py", line 93 in _hookexec
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\pluggy\hooks.py", line 286 in __call__
  File "C:\Miniconda\envs\pandas-dev\lib\site-packages\_pytest\config\__init__.py", line 164 in main
  File "C:\Miniconda\envs\pandas-dev\Scripts\pytest-script.py", line 10 in <module>
The STDIO streams did not close within 10 seconds of the exit event from process 'C:\Program Files\Git\bin\bash.exe'. This may indicate a child process inherited the STDIO streams and has not yet exited.
```

Is this an upstream thing?