pytest 'hangs' upon completing test run

[JohnStokes228]

hi all,

i've hit an issue attempting to run pytest for dagster assets. it appears that after running a successful test, pytest simply hangs and never returns control to the console back to me.

a minimal example is:

@asset(name='hello_world')
def arbitrary_asset():
    Output(value=12)


def test_arbitrary_asset():
    assert arbitrary_asset() == 12

my environment looks like:

dependencies:

• python=3.9.17
• pip=23.1.2
• pip:
  • pins==0.8.3
  • sqlfluff==2.3.1
  • black==22.3.0
  • pluggy==1.3.0
  • xlrd==1.2.0
  • openpyxl==3.1.2
  • jupyter
  • pre-commit==3.4.0
  • pyodbc==4.0.39
  • scikit-learn==1.3.0
  • pyprojroot==0.3.0
  • pandas==2.1.0
  • pyarrow==13.0.0
  • numpy==1.24.4
  • matplotlib==3.7.2
  • seaborn==0.12.2
  • lightgbm==4.1.0
  • shap==0.42.1
  • optuna==3.3.0
  • imbalanced-learn==0.11.0
  • jupyter-contrib-nbextensions
  • tubular==1.0.0
  • jupytext==1.15.2
  • gitpython==3.1.40
  • dagster==1.5.3
  • dagster-webserver==1.5.3
  • dagster-pandas==0.21.3
  • pytest==7.4.3

run on a Windows Server 2019 machine

potentially relevant note, the problem isnt seen if the tests fail. Any guidance on what I might be setting up wrong would be welcome as there isnt any trace to debug from.

cheers!

[JohnStokes228]

as an update to this:

• the issue isnt seen in the identical environment when run on linux machines
• the issue isnt seen on windows machines when running pytest with the xdist plugin (? why is this the case?)
  looks to be some issue in the way its dealing with the async - potentially GIL related since it works on linux?

[Lord-Kamina]

Was this ever figured out? I'm seeing a similar issue and wonder whether they're related