https://github.com/python/cpython/commit/e9d63760fea8748638f6e495b5b07bd1805... commit: e9d63760fea8748638f6e495b5b07bd1805c9591 branch: main author: Guido van Rossum <guido@python.org> committer: gvanrossum <gvanrossum@gmail.com> date: 2022-09-30T12:55:40-07:00 summary: GH-96827: Don't touch closed loops from executor threads (#96837) * When chaining futures, skip callback if loop closed. * When shutting down an executor, don't wake a closed loop. files: A Misc/NEWS.d/next/Library/2022-09-30-15-56-20.gh-issue-96827.lzy1iw.rst M Lib/asyncio/base_events.py M Lib/asyncio/futures.py diff --git a/Lib/asyncio/base_events.py b/Lib/asyncio/base_events.py index 9c9d98dbb9c5..2df9dcac8f72 100644 --- a/Lib/asyncio/base_events.py +++ b/Lib/asyncio/base_events.py @@ -588,9 +588,11 @@ async def shutdown_default_executor(self, timeout=None): def _do_shutdown(self, future): try: self._default_executor.shutdown(wait=True) - self.call_soon_threadsafe(future.set_result, None) + if not self.is_closed(): + self.call_soon_threadsafe(future.set_result, None) except Exception as ex: - self.call_soon_threadsafe(future.set_exception, ex) + if not self.is_closed(): + self.call_soon_threadsafe(future.set_exception, ex) def _check_running(self): if self.is_running(): diff --git a/Lib/asyncio/futures.py b/Lib/asyncio/futures.py index 4bd9629e9eb6..39776e3c2cce 100644 --- a/Lib/asyncio/futures.py +++ b/Lib/asyncio/futures.py @@ -404,6 +404,8 @@ def _call_set_state(source): if dest_loop is None or dest_loop is source_loop: _set_state(destination, source) else: + if dest_loop.is_closed(): + return dest_loop.call_soon_threadsafe(_set_state, destination, source) destination.add_done_callback(_call_check_cancel) diff --git a/Misc/NEWS.d/next/Library/2022-09-30-15-56-20.gh-issue-96827.lzy1iw.rst b/Misc/NEWS.d/next/Library/2022-09-30-15-56-20.gh-issue-96827.lzy1iw.rst new file mode 100644 index 000000000000..159ab32ffbfc --- /dev/null +++ b/Misc/NEWS.d/next/Library/2022-09-30-15-56-20.gh-issue-96827.lzy1iw.rst @@ -0,0 +1 @@ +Avoid spurious tracebacks from :mod:`asyncio` when default executor cleanup is delayed until after the event loop is closed (e.g. as the result of a keyboard interrupt).