[issue37387] test_compileall fails randomly on Windows when tests are run in parallel

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

x86 Windows7 3.8:
https://buildbot.python.org/all/#/builders/223/builds/59

FAIL: test_no_args_respects_force_flag (test.test_compileall.CommmandLineTestsNoSourceEpoch)
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Traceback (most recent call last):
  File "D:\cygwin\home\db3l\buildarea\3.8.bolen-windows7\build\lib\test\test_py_compile.py", line 20, in wrapper
    return fxn(*args, **kwargs)
  File "D:\cygwin\home\db3l\buildarea\3.8.bolen-windows7\build\lib\test\test_py_compile.py", line 20, in wrapper
    return fxn(*args, **kwargs)
  File "D:\cygwin\home\db3l\buildarea\3.8.bolen-windows7\build\lib\test\test_compileall.py", line 322, in test_no_args_respects_force_flag
    self.assertRunOK('-f', PYTHONPATH=self.directory)
  File "D:\cygwin\home\db3l\buildarea\3.8.bolen-windows7\build\lib\test\test_compileall.py", line 271, in assertRunOK
    rc, out, err = script_helper.assert_python_ok(
  File "D:\cygwin\home\db3l\buildarea\3.8.bolen-windows7\build\lib\test\support\script_helper.py", line 157, in assert_python_ok
    return _assert_python(True, *args, **env_vars)
  File "D:\cygwin\home\db3l\buildarea\3.8.bolen-windows7\build\lib\test\support\script_helper.py", line 143, in _assert_python
    res.fail(cmd_line)
  File "D:\cygwin\home\db3l\buildarea\3.8.bolen-windows7\build\lib\test\support\script_helper.py", line 70, in fail
    raise AssertionError("Process return code is %d\n"
AssertionError: Process return code is 1
command line: ['D:\\cygwin\\home\\db3l\\buildarea\\3.8.bolen-windows7\\build\\PCbuild\\win32\\python_d.exe', '-X', 'faulthandler', '-S', '-m', 'compileall', '-f']

stdout:
---
(...)

Compiling 'D:\\cygwin\\home\\db3l\\buildarea\\3.8.bolen-windows7\\build\\lib\\socketserver.py'...

Compiling 'D:\\cygwin\\home\\db3l\\buildarea\\3.8.bolen-windows7\\build\\lib\\sre_compile.py'...

*** PermissionError: [WinError 5] Access is denied: 'D:\\cygwin\\home\\db3l\\buildarea\\3.8.bolen-windows7\\build\\lib\\__pycache__\\sre_compile.cpython-38.pyc.12753880' -> 'D:\\cygwin\\home\\db3l\\buildarea\\3.8.bolen-windows7\\build\\lib\\__pycache__\\sre_compile.cpython-38.pyc'

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37387>
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