Message 363654 - Python tracker

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Author	vstinner
Recipients	Arfrever, neologix, pitrou, python-dev, serhiy.storchaka, vajrasky, vstinner
Date	2020-03-08.11:29:18
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1583666958.97.0.253833822545.issue19466@roundup.psfhosted.org>
In-reply-to

Content
asyncio_gc.py: script to reproduce bpo-20526 (copied from there), but ported to Python 3.9 (replace asyncio.async with asyncio.ensure_future). Sadly, Python with PR 18848 does crash when running asyncio_gc.py if I press CTRL+c twice: * A thread does crash in _PyObject_GC_TRACK_impl() called indirectly by select_epoll_poll_impl(), in a Python thread * while main thread is exiting Python: Py_FinalizeEx() is calling _PyImport_Cleanup() which blocks on take_gil() It seems like the main thread does not hold the hold, the thread which crashed does. It should not happen: _PyRuntimeState_SetFinalizing(runtime, tstate) has been called and so no other thread should be able to take the GIL anymore, but exit immediately.

asyncio_gc.py: script to reproduce bpo-20526 (copied from there), but ported to Python 3.9 (replace asyncio.async with asyncio.ensure_future).

Sadly, Python with PR 18848 does crash when running asyncio_gc.py if I press CTRL+c twice:

* A thread does crash in _PyObject_GC_TRACK_impl() called indirectly by select_epoll_poll_impl(), in a Python thread
* while main thread is exiting Python: Py_FinalizeEx() is calling _PyImport_Cleanup() which blocks on take_gil()

It seems like the main thread does *not* hold the hold, the thread which crashed does.

It should not happen: _PyRuntimeState_SetFinalizing(runtime, tstate) has been called and so no other thread should be able to take the GIL anymore, but exit immediately.

History
Date	User	Action	Args
2020-03-08 11:29:19	vstinner	set	recipients: + vstinner, pitrou, Arfrever, neologix, python-dev, serhiy.storchaka, vajrasky
2020-03-08 11:29:18	vstinner	set	messageid: <1583666958.97.0.253833822545.issue19466@roundup.psfhosted.org>
2020-03-08 11:29:18	vstinner	link	issue19466 messages
2020-03-08 11:29:18	vstinner	create