[issue40696] Exception handling with "await" can hang in Python3.9.0b1

[Chris Jerdonek]

Chris Jerdonek  added the comment:

Okay, I'll close the issue and update it to reflect that it was restricted to 
the narrower, originally reported issue.

--
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
title: exception chain cycles cause hangs  (was "Exception handling with 
"await" can hang in Python3.9.0b1") -> Exception handling with "await" can hang 
in Python3.9.0b1

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[issue40696] Exception handling with "await" can hang in Python3.9.0b1

[Chris Jerdonek]

Chris Jerdonek  added the comment:


New changeset 7f77ac463cff219e0c8afef2611cad5080cc9df1 by Miss Islington (bot) 
in branch '3.9':
bpo-40696: Fix a hang that can arise after gen.throw() (GH-20287)
https://github.com/python/cpython/commit/7f77ac463cff219e0c8afef2611cad5080cc9df1


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[issue40696] Exception handling with "await" can hang in Python3.9.0b1

[miss-islington]

Change by miss-islington :


--
pull_requests: +19591
pull_request: https://github.com/python/cpython/pull/20322

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[issue40696] Exception handling with "await" can hang in Python3.9.0b1

[Mariusz Felisiak]

Mariusz Felisiak  added the comment:

Chris, many thanks for detailed explanation, extensive investigation, and a fix!

We'll also review Django's code in the next few days.

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[issue40696] Exception handling with "await" can hang in Python3.9.0b1

[Chris Jerdonek]

Chris Jerdonek  added the comment:


New changeset 7c30d12bd5359b0f66c4fbc98aa055398bcc8a7e by Chris Jerdonek in 
branch 'master':
bpo-40696: Fix a hang that can arise after gen.throw() (GH-20287)
https://github.com/python/cpython/commit/7c30d12bd5359b0f66c4fbc98aa055398bcc8a7e


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[issue40696] Exception handling with "await" can hang in Python3.9.0b1

[miss-islington]

Change by miss-islington :


--
nosy: +miss-islington
nosy_count: 8.0 -> 9.0
pull_requests: +19590
pull_request: https://github.com/python/cpython/pull/20321

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[issue40696] Exception handling with "await" can hang in Python3.9.0b1

[Chris Jerdonek]

Chris Jerdonek  added the comment:

Mariusz, someone may also want to review Django's code there. Raising an 
exception that would otherwise create a cycle in the chain could be obscuring 
another issue, or there could be more straightforward alternatives. (The Python 
issue will still be fixed of course.)

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[issue40696] Exception handling with "await" can hang in Python3.9.0b1

[Chris Jerdonek]

Change by Chris Jerdonek :


--
components: +Interpreter Core -asyncio
title: "await" hangs in Python3.9.0b1. -> Exception handling with "await" can 
hang in Python3.9.0b1
type:  -> behavior
versions: +Python 3.10

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