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[3.9] bpo-40696: Fix a hang that can arise after gen.throw() (GH-20287)#20322

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cjerdonek merged 1 commit intopython:3.9from
miss-islington:backport-7c30d12-3.9
May 22, 2020
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[3.9] bpo-40696: Fix a hang that can arise after gen.throw() (GH-20287)#20322
cjerdonek merged 1 commit intopython:3.9from
miss-islington:backport-7c30d12-3.9

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@miss-islington miss-islington commented May 22, 2020

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 7c30d12)

Co-authored-by: Chris Jerdonek chris.jerdonek@gmail.com

https://bugs.python.org/issue40696

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 7c30d12)

Co-authored-by: Chris Jerdonek <chris.jerdonek@gmail.com>
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@cjerdonek: Status check is done, and it's a success ✅ .

@cjerdonek cjerdonek merged commit 7f77ac4 into python:3.9 May 22, 2020
@miss-islington miss-islington deleted the backport-7c30d12-3.9 branch May 22, 2020 21:35
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@cjerdonek: Status check is done, and it's a success ✅ .

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@cjerdonek: Status check is done, and it's a success ✅ .

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4 participants