[Win] Windows fatal exception: access violation in test_wipe

[qlixed]

During the windows test we see the following error:

tests/test_memwiper.py::test_wipe[Hola ni\xf1o!\n] Windows fatal exception: access violation

Test for windows is failing, always. The full log of the last run is:

[5080] C:\Users\travis\build\qlixed\python-memwiper$ 'C:\Users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\Scripts\python.EXE' -m pip install --exists-action w '.tox\.tmp\package\1\memwiper-0.9.0.zip' >.tox\py38-nocov\log\py38-nocov-2.log
[3656] C:\Users\travis\build\qlixed\python-memwiper$ 'C:\Users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\Scripts\python.EXE' -m pip freeze >.tox\py38-nocov\log\py38-nocov-3.log
py38-nocov installed: atomicwrites==1.3.0,attrs==19.3.0,colorama==0.4.3,memwiper==0.9.0,more-itertools==8.0.2,packaging==19.2,pluggy==0.13.1,py==1.8.1,pyparsing==2.4.6,pytest==5.3.2,pytest-travis-fold==1.3.0,six==1.13.0,wcwidth==0.1.8
py38-nocov run-test-pre: PYTHONHASHSEED='681'
py38-nocov run-test: commands[0] | python setup.py clean --all build_ext --force --inplace
[4804] C:\Users\travis\build\qlixed\python-memwiper$ 'C:\Users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\Scripts\python.EXE' setup.py clean --all build_ext --force --inplace
running clean
'build\lib.win-amd64-3.8' does not exist -- can't clean it
'build\bdist.win-amd64' does not exist -- can't clean it
'build\scripts-3.8' does not exist -- can't clean it
running build_ext
building 'memwiper.c_src.memwiper_core' extension
creating build
creating build\temp.win-amd64-3.8
creating build\temp.win-amd64-3.8\Release
creating build\temp.win-amd64-3.8\Release\src
creating build\temp.win-amd64-3.8\Release\src\memwiper
creating build\temp.win-amd64-3.8\Release\src\memwiper\c_src
C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Tools\MSVC\14.16.27023\bin\HostX86\x64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -Isrc\memwiper\c_src -Ic:\python38\include -Ic:\python38\include "-IC:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Tools\MSVC\14.16.27023\ATLMFC\include" "-IC:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Tools\MSVC\14.16.27023\include" "-IC:\Program Files (x86)\Windows Kits\NETFXSDK\4.6.1\include\um" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\ucrt" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\shared" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\winrt" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\cppwinrt" /Tcsrc\memwiper\c_src\memwiper_core.c /Fobuild\temp.win-amd64-3.8\Release\src\memwiper\c_src\memwiper_core.obj
memwiper_core.c
src\memwiper\c_src\memwiper_core.c(40): warning C4244: '=': conversion from 'Py_ssize_t' to 'int', possible loss of data
src\memwiper\c_src\memwiper_core.c(50): warning C4566: character represented by universal-character-name '\uFFFF' cannot be represented in the current code page (1252)
src\memwiper\c_src\memwiper_core.c(50): warning C4566: character represented by universal-character-name '\U000FFFFF' cannot be represented in the current code page (1252)
src\memwiper\c_src\memwiper_core.c(90): warning C4244: '=': conversion from 'Py_ssize_t' to 'int', possible loss of data
creating C:\Users\travis\build\qlixed\python-memwiper\build\lib.win-amd64-3.8
creating C:\Users\travis\build\qlixed\python-memwiper\build\lib.win-amd64-3.8\memwiper
creating C:\Users\travis\build\qlixed\python-memwiper\build\lib.win-amd64-3.8\memwiper\c_src
C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Tools\MSVC\14.16.27023\bin\HostX86\x64\link.exe /nologo /INCREMENTAL:NO /LTCG /DLL /MANIFEST:EMBED,ID=2 /MANIFESTUAC:NO /LIBPATH:c:\python38\Libs /LIBPATH:C:\Users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\libs /LIBPATH:C:\Users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\PCbuild\amd64 "/LIBPATH:C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Tools\MSVC\14.16.27023\ATLMFC\lib\x64" "/LIBPATH:C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Tools\MSVC\14.16.27023\lib\x64" "/LIBPATH:C:\Program Files (x86)\Windows Kits\NETFXSDK\4.6.1\lib\um\x64" "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.18362.0\ucrt\x64" "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.18362.0\um\x64" /EXPORT:PyInit_memwiper_core build\temp.win-amd64-3.8\Release\src\memwiper\c_src\memwiper_core.obj /OUT:build\lib.win-amd64-3.8\memwiper\c_src\memwiper_core.cp38-win_amd64.pyd /IMPLIB:build\temp.win-amd64-3.8\Release\src\memwiper\c_src\memwiper_core.cp38-win_amd64.lib
   Creating library build\temp.win-amd64-3.8\Release\src\memwiper\c_src\memwiper_core.cp38-win_amd64.lib and object build\temp.win-amd64-3.8\Release\src\memwiper\c_src\memwiper_core.cp38-win_amd64.exp
Generating code
Finished generating code
building 'memwiper.c_src.memwiper_utils' extension
C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Tools\MSVC\14.16.27023\bin\HostX86\x64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -Isrc\memwiper\c_src -Ic:\python38\include -Ic:\python38\include "-IC:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Tools\MSVC\14.16.27023\ATLMFC\include" "-IC:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Tools\MSVC\14.16.27023\include" "-IC:\Program Files (x86)\Windows Kits\NETFXSDK\4.6.1\include\um" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\ucrt" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\shared" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\winrt" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\cppwinrt" /Tcsrc\memwiper\c_src\memwiper_utils.c /Fobuild\temp.win-amd64-3.8\Release\src\memwiper\c_src\memwiper_utils.obj
memwiper_utils.c
C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Tools\MSVC\14.16.27023\bin\HostX86\x64\link.exe /nologo /INCREMENTAL:NO /LTCG /DLL /MANIFEST:EMBED,ID=2 /MANIFESTUAC:NO /LIBPATH:c:\python38\Libs /LIBPATH:C:\Users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\libs /LIBPATH:C:\Users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\PCbuild\amd64 "/LIBPATH:C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Tools\MSVC\14.16.27023\ATLMFC\lib\x64" "/LIBPATH:C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Tools\MSVC\14.16.27023\lib\x64" "/LIBPATH:C:\Program Files (x86)\Windows Kits\NETFXSDK\4.6.1\lib\um\x64" "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.18362.0\ucrt\x64" "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.18362.0\um\x64" /EXPORT:PyInit_memwiper_utils build\temp.win-amd64-3.8\Release\src\memwiper\c_src\memwiper_utils.obj /OUT:build\lib.win-amd64-3.8\memwiper\c_src\memwiper_utils.cp38-win_amd64.pyd /IMPLIB:build\temp.win-amd64-3.8\Release\src\memwiper\c_src\memwiper_utils.cp38-win_amd64.lib
   Creating library build\temp.win-amd64-3.8\Release\src\memwiper\c_src\memwiper_utils.cp38-win_amd64.lib and object build\temp.win-amd64-3.8\Release\src\memwiper\c_src\memwiper_utils.cp38-win_amd64.exp
Generating code
Finished generating code
copying build\lib.win-amd64-3.8\memwiper\c_src\memwiper_core.cp38-win_amd64.pyd -> src\memwiper\c_src
copying build\lib.win-amd64-3.8\memwiper\c_src\memwiper_utils.cp38-win_amd64.pyd -> src\memwiper\c_src
py38-nocov run-test: commands[1] | pytest -vv --ignore=src
[1016] C:\Users\travis\build\qlixed\python-memwiper$ 'C:\Users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\Scripts\pytest.EXE' -vv --ignore=src
============================= test session starts =============================
platform win32 -- Python 3.8.0, pytest-5.3.2, py-1.8.1, pluggy-0.13.1 -- c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\scripts\python.exe
cachedir: .tox\py38-nocov\.pytest_cache
rootdir: C:\Users\travis\build\qlixed\python-memwiper, inifile: tox.ini, testpaths: tests
plugins: travis-fold-1.3.0
collecting ... collected 83 items

tests/test_memwiper.py::test_wipe[\u0645\u0631\u062d\u0628\u0627 \u0637\u0641\u0644!\n] PASSED [  1%]
tests/test_memwiper.py::test_wipe[\u1787\u17c6\u179a\u17b6\u1794\u179f\u17bd\u179a\u1780\u17bc\u1793!\n] PASSED [  2%]
tests/test_memwiper.py::test_wipe[Dobr\xfd den d\xedt\u011b!\n] PASSED   [  3%]
tests/test_memwiper.py::test_wipe[\u4f60\u597d\u5b69\u5b50\uff01\n] PASSED [  4%]
tests/test_memwiper.py::test_wipe[\uc548\ub155 \uc598\uc57c!\n] PASSED   [  6%]
tests/test_memwiper.py::test_wipe[Dobr\xfd de\u0148 die\u0165a!\n] PASSED [  7%]
tests/test_memwiper.py::test_wipe[Hola ni\xf1o!\n] Windows fatal exception: access violation

Current thread 0x000012e4 (most recent call first):
  File "C:\Users\travis\build\qlixed\python-memwiper\tests\test_memwiper.py", line 21 in test_wipe
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\_pytest\python.py", line 166 in pytest_pyfunc_call
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\pluggy\callers.py", line 187 in _multicall
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\pluggy\manager.py", line 84 in <lambda>
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\pluggy\manager.py", line 93 in _hookexec
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\pluggy\hooks.py", line 286 in __call__
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\_pytest\python.py", line 1435 in runtest
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\_pytest\runner.py", line 131 in pytest_runtest_call
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\pluggy\callers.py", line 187 in _multicall
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\pluggy\manager.py", line 84 in <lambda>
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\pluggy\manager.py", line 93 in _hookexec
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\pluggy\hooks.py", line 286 in __call__
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\_pytest\runner.py", line 207 in <lambda>
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\_pytest\runner.py", line 234 in from_call
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\_pytest\runner.py", line 206 in call_runtest_hook
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\_pytest\runner.py", line 182 in call_and_report
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\_pytest\runner.py", line 96 in runtestprotocol
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\_pytest\runner.py", line 81 in pytest_runtest_protocol
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\pluggy\callers.py", line 187 in _multicall
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\pluggy\manager.py", line 84 in <lambda>
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\pluggy\manager.py", line 93 in _hookexec
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\pluggy\hooks.py", line 286 in __call__
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\_pytest\main.py", line 270 in pytest_runtestloop
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\pluggy\callers.py", line 187 in _multicall
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\pluggy\manager.py", line 84 in <lambda>
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\pluggy\manager.py", line 93 in _hookexec
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\pluggy\hooks.py", line 286 in __call__
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\_pytest\main.py", line 246 in _main
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\_pytest\main.py", line 196 in wrap_session
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\_pytest\main.py", line 239 in pytest_cmdline_main
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\pluggy\callers.py", line 187 in _multicall
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\pluggy\manager.py", line 84 in <lambda>
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\pluggy\manager.py", line 93 in _hookexec
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\pluggy\hooks.py", line 286 in __call__
  File "c:\users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\lib\site-packages\_pytest\config\__init__.py", line 91 in main
  File "C:\Users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\Scripts\pytest.EXE\__main__.py", line 7 in <module>
  File "c:\python38\Lib\runpy.py", line 85 in _run_code
  File "c:\python38\Lib\runpy.py", line 192 in _run_module_as_main
ERROR: InvocationError for command 'C:\Users\travis\build\qlixed\python-memwiper\.tox\py38-nocov\Scripts\pytest.EXE' -vv --ignore=src (exited with code 3221225477)