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authorAndrew Svetlov <andrew.svetlov@gmail.com>2020-11-10 13:58:31 (GMT)
committerGitHub <noreply@github.com>2020-11-10 13:58:31 (GMT)
commit42d873c63aa9d160c132be4a34599531574db12c (patch)
tree52d68f9f283cfe6c7b91239f7bce075ed1e1f418 /Lib/test/test_asyncio/test_futures2.py
parent0b9c4c6fcf2b0673fa45ddfa092934a9d5479b8c (diff)
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bpo-42183: Fix a stack overflow error for asyncio Task or Future repr() (GH-23020)
The overflow occurs under some circumstances when a task or future recursively returns itself. Co-authored-by: Kyle Stanley <aeros167@gmail.com>
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diff --git a/Lib/test/test_asyncio/test_futures2.py b/Lib/test/test_asyncio/test_futures2.py
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+# IsolatedAsyncioTestCase based tests
+import asyncio
+import unittest
+
+
+class FutureTests(unittest.IsolatedAsyncioTestCase):
+ async def test_recursive_repr_for_pending_tasks(self):
+ # The call crashes if the guard for recursive call
+ # in base_futures:_future_repr_info is absent
+ # See Also: https://bugs.python.org/issue42183
+
+ async def func():
+ return asyncio.all_tasks()
+
+ # The repr() call should not raise RecursiveError at first.
+ # The check for returned string is not very reliable but
+ # exact comparison for the whole string is even weaker.
+ self.assertIn('...', repr(await asyncio.wait_for(func(), timeout=10)))