Locally failing tests

[jannikluhn]

What was wrong?

A few tests related to SIGINT and process killing are failing on my machine. I assume this is the cause of https://github.com/ethereum/trinity/issues/1507.

Code that produced the error

The following two test cases are failing:

tests/core/test_open_in_process.py::test_open_proc_SIGINT_can_be_handled FAILED [ 15%]
tests/core/test_open_in_process.py::test_open_proc_SIGINT_can_be_ignored FAILED [ 18%]

Sometimes, they fail immediately, sometimes they block indefinitely and I have to kill them manually.

Full error output

================================================================================== FAILURES ==================================================================================
____________________________________________________________________ test_open_proc_SIGINT_can_be_handled ____________________________________________________________________

    @pytest.mark.asyncio
    async def test_open_proc_SIGINT_can_be_handled():
        async def do_sleep_forever():
            try:
                while True:
                    await asyncio.sleep(0)
            except KeyboardInterrupt:
                return 9999

        async with open_in_process(do_sleep_forever) as proc:
            proc.send_signal(signal.SIGINT)
>       assert proc.returncode == 0
E       assert 2 == 0
E         -2
E         +0

do_sleep_forever = <function test_open_proc_SIGINT_can_be_handled.<locals>.do_sleep_forever at 0x7f7cc9b84c10>
proc       = <asyncio_run_in_process.process.Process object at 0x7f7cc9b34430>

tests/core/test_open_in_process.py:58: AssertionError
____________________________________________________________________ test_open_proc_SIGINT_can_be_ignored ____________________________________________________________________

    @pytest.mark.asyncio
    async def test_open_proc_SIGINT_can_be_ignored():
        async def do_sleep_forever():
            try:
                while True:
                    await asyncio.sleep(0)
            except KeyboardInterrupt:
                # silence the first SIGINT
                pass

            try:
                while True:
                    await asyncio.sleep(0)
            except KeyboardInterrupt:
                return 9999

        async with open_in_process(do_sleep_forever) as proc:
            proc.send_signal(signal.SIGINT)
            await asyncio.sleep(0.01)
>           proc.send_signal(signal.SIGINT)

do_sleep_forever = <function test_open_proc_SIGINT_can_be_ignored.<locals>.do_sleep_forever at 0x7f7cc9b849d0>
proc       = <asyncio_run_in_process.process.Process object at 0x7f7cc9b4d670>

tests/core/test_open_in_process.py:81: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <asyncio_run_in_process.process.Process object at 0x7f7cc9b4d670>, signum = <Signals.SIGINT: 2>

    def send_signal(self, signum: signal.Signals) -> None:
        """
        Issues the provided signal to the process.
        """
>       os.kill(self.pid, signum.value)
E       ProcessLookupError: [Errno 3] No such process

self       = <asyncio_run_in_process.process.Process object at 0x7f7cc9b4d670>
signum     = <Signals.SIGINT: 2>

asyncio_run_in_process/process.py:277: ProcessLookupError

Environment

$ python -m eth_utils

Python version:
3.8.1 (default, Dec 21 2019, 20:57:38) 
[GCC 9.2.0]

Operating System: Linux-4.19.91-1-MANJARO-x86_64-with-glibc2.2.5

pip freeze result:
alabaster==0.7.12
apipkg==1.5
argh==0.26.2
async-generator==1.10
-e git+git@github.com:ethereum/asyncio-run-in-process.git@74f11319739c64c0fe8ff7c2aebee3ecf5a125e8#egg=asyncio_run_in_process
atomicwrites==1.3.0
attrs==19.3.0
Babel==2.8.0
backcall==0.1.0
bleach==3.1.0
bumpversion==0.5.3
certifi==2019.11.28
cffi==1.13.2
chardet==3.0.4
cloudpickle==1.2.2
colorama==0.4.3
cryptography==2.8
cytoolz==0.10.1
decorator==4.4.1
docopt==0.6.2
docutils==0.16
eth-hash==0.2.0
eth-typing==2.2.1
eth-utils==1.8.4
execnet==1.7.1
flake8==3.4.1
idna==2.8
imagesize==1.2.0
ipython==7.11.1
ipython-genutils==0.2.0
isort==4.3.21
jedi==0.15.2
jeepney==0.4.2
Jinja2==2.10.3
keyring==21.1.0
MarkupSafe==1.1.1
mccabe==0.6.1
more-itertools==8.1.0
mypy==0.740
mypy-extensions==0.4.3
packaging==20.0
parso==0.5.2
pathtools==0.1.2
pexpect==4.8.0
pickleshare==0.7.5
pkginfo==1.5.0.1
pluggy==0.13.1
prompt-toolkit==3.0.2
ptyprocess==0.6.0
py==1.8.1
pycodestyle==2.3.1
pycparser==2.19
pydocstyle==3.0.0
pyflakes==1.5.0
Pygments==2.5.2
pyparsing==2.4.6
pytest==5.2.2
pytest-asyncio==0.10.0
pytest-forked==1.1.3
pytest-watch==4.2.0
pytest-xdist==1.31.0
pytz==2019.3
PyYAML==5.3
readme-renderer==24.0
requests==2.22.0
requests-toolbelt==0.9.1
SecretStorage==3.1.2
six==1.14.0
snowballstemmer==2.0.0
Sphinx==1.8.5
sphinx-rtd-theme==0.4.3
sphinxcontrib-websupport==1.1.2
toolz==0.10.0
tox==2.9.1
tqdm==4.41.1
traitlets==4.3.3
twine==3.1.1
typed-ast==1.4.1
typing-extensions==3.7.4.1
urllib3==1.25.8
virtualenv==16.7.9
watchdog==0.9.0
wcwidth==0.1.8
webencodings==0.5.1