coverage 6.3 failed for parallel execution · Issue #1312 · nedbat/coveragepy (original) (raw)

Describe the bug
A clear and concise description of the bug.

To Reproduce
How can we reproduce the problem? Please be specific. Don't link to a failing CI job. Answer the questions below:

What version of Python are you using?
3.8.12
What version of coverage.py shows the problem? The output of coverage debug sys is helpful.
6.3
What versions of what packages do you have installed? The output of pip freeze is helpful.
pytest =6.2.5
coverage=6.3
What code shows the problem? Give us a specific commit of a specific repo that we can check out. If you've already worked around the problem, please provide a commit before that fix.
What commands did you run?
pytest --cov-config=.coveragerc --cov=../our_code --workers auto --durations=0

Expected behavior
It should run tests in parallel and generate code coverage

Additional context
Getting error messages

_```
______________ ERROR at setup of TestTracing.test_trace_results _______________

self = <pytest_cov.plugin.CovPlugin object at 0x7fc911671040>
item =

def pytest_runtest_setup(self, item):
    if os.getpid() != self.pid:
        # test is run in another process than session, run
        # coverage manually

/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/site-packages/pytest_cov/plugin.py:350:

/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/site-packages/pytest_cov/embed.py:74: in init
cov.start()
/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/site-packages/coverage/control.py:567: in start
self._init_for_start()
/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/site-packages/coverage/control.py:536: in _init_for_start
self._old_sigterm = signal.signal(signal.SIGTERM, self._on_sigterm)

signalnum = <Signals.SIGTERM: 15>
handler = <bound method Coverage._on_sigterm of <coverage.control.Coverage object at 0x7fc8ed755ee0>>

@_wraps(_signal.signal)
def signal(signalnum, handler):

 handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))

E ValueError: signal only works in main thread

/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/signal.py:47: ValueError
_______________ ERROR at setup of TestDistributions.test_exp2inf _______________

self = <pytest_cov.plugin.CovPlugin object at 0x7fc911671040>
item =

def pytest_runtest_setup(self, item):
    if os.getpid() != self.pid:
        # test is run in another process than session, run
        # coverage manually

/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/site-packages/pytest_cov/plugin.py:350:

signalnum = <Signals.SIGTERM: 15>
handler = <bound method Coverage._on_sigterm of <coverage.control.Coverage object at 0x7fc8ed7de5e0>>

@_wraps(_signal.signal)
def signal(signalnum, handler):

 handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))

E ValueError: signal only works in main thread

/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/signal.py:47: ValueError