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bpo-40696: Fix a hang that can arise after gen.throw() (GH-20287)

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This updates _PyErr_ChainStackItem() to use _PyErr_SetObject()
instead of _PyErr_ChainExceptions(). This prevents a hang in
certain circumstances because _PyErr_SetObject() performs checks
to prevent cycles in the exception context chain while
_PyErr_ChainExceptions() doesn't.
(cherry picked from commit 7c30d12bd5)

Co-authored-by: Chris Jerdonek <chris.jerdonek@gmail.com>
This commit is contained in:
Miss Islington (bot) 2020-05-22 14:35:22 -07:00 • committed by GitHub
parent a08b7c3bb0
commit 7f77ac463c
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7 changed files with 130 additions and 23 deletions
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Include/internal/pycore_pyerrors.h
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@ -51,7 +51,7 @@ PyAPI_FUNC(void) _PyErr_SetObject(
PyObject *value);
PyAPI_FUNC(void) _PyErr_ChainStackItem(
_PyErr_StackItem *exc_state);
_PyErr_StackItem *exc_info);
PyAPI_FUNC(void) _PyErr_Clear(PyThreadState *tstate);