asyncio exception handler called with incorrect context #96704
Description
Reproducer:
import asyncio import contextvars name = contextvars.ContextVar('name', default='foo') def exc_handler(*args): assert name.get() == 'bar' async def task(): name.set('bar') 1/0 async def main(): loop = asyncio.get_running_loop() loop.set_exception_handler(exc_handler) asyncio.create_task(task()) asyncio.run(main())On main:
Unhandled error in exception handler context: {'message': 'Task exception was never retrieved', 'exception': ZeroDivisionError('division by zero'), 'future': <Task finished name='Task-2' coro=<task() done, defined at /workspaces/cpython/main.py:11> exception=ZeroDivisionError('division by zero')>} Traceback (most recent call last): File "/workspaces/cpython/Lib/asyncio/base_events.py", line 1797, in call_exception_handler self._exception_handler(self, context) File "/workspaces/cpython/main.py", line 8, in exc_handler assert name.get() == 'bar' AssertionErrorThe exception handler is called with incorrect context hence the AssertionError. It should called with the same context as the task.
My use case is retrieving the current request id from the context var if there are any unhandled error but because of this bug, I always get the default value.
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