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Kombu 4.2.2: py.test seems to fail/hang

See original GitHub issue

Hi guys,

My CI detected that the new release of Kombu is not working in my project anymore, specifically when trying to run py.test with my application.

So far I don’t know what the root cause of the problem is with Kombu, but pinning to 4.2.1 worked for us.

This is what I was able to pull out of pytest with PYTEST_DEBUG enabled, which pointed me down the road of “did they release a new version of Kombu”:

early skip of rewriting module: hiredis.hiredis [assertion]
    early skip of rewriting module: hiredis.version [assertion]
    early skip of rewriting module: redis.lock [assertion]
    early skip of rewriting module: redis.sentinel [assertion]
    early skip of rewriting module: django_celery_results.backends [assertion]
    early skip of rewriting module: django_celery_results.backends.cache [assertion]
    matched marked file 'celery.backends' (from 'celery') [assertion]
    find_module called for: celery.backends [assertion]
    rewriting '/usr/local/lib/python3.6/site-packages/celery/backends.py' [assertion]
    matched marked file 'celery.backends.base' (from 'celery') [assertion]
    find_module called for: celery.backends.base [assertion]
    rewriting '/usr/local/lib/python3.6/site-packages/celery/backends/base.py' [assertion]
    early skip of rewriting module: django_celery_results.backends.database [assertion]
    matched marked file 'celery.app.events' (from 'celery') [assertion]
    find_module called for: celery.app.events [assertion]
    rewriting '/usr/local/lib/python3.6/site-packages/celery/app/events.py' [assertion]
    matched marked file 'celery.events' (from 'celery') [assertion]
    find_module called for: celery.events [assertion]
    rewriting '/usr/local/lib/python3.6/site-packages/celery/events.py' [assertion]
    matched marked file 'celery.events.dispatcher' (from 'celery') [assertion]
    find_module called for: celery.events.dispatcher [assertion]
    rewriting '/usr/local/lib/python3.6/site-packages/celery/events/dispatcher.py' [assertion]
    matched marked file 'celery.events.event' (from 'celery') [assertion]
    find_module called for: celery.events.event [assertion]
    rewriting '/usr/local/lib/python3.6/site-packages/celery/events/event.py' [assertion]
    matched marked file 'celery.events.receiver' (from 'celery') [assertion]
    find_module called for: celery.events.receiver [assertion]
    rewriting '/usr/local/lib/python3.6/site-packages/celery/events/receiver.py' [assertion]
    early skip of rewriting module: kombu.mixins [assertion]
    early skip of rewriting module: kombu.utils.limits [assertion]

And it just hangs from there.