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GeezerVison is showing github.com — gh-127057: Re-arm proactor datagram read loop after a recoverable OSError by graingert · Pull Request #156726 · python/cpython

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@graingert

@graingert graingert commented Aug 31, 2026 •
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  • Issue: asyncio proactor udp transport stops responding after send to port that isn't listening due to ConnectionResetError from WSARecvFrom #127057

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@bedevere-app bedevere-app Bot mentioned this pull request Aug 31, 2026
asyncio proactor udp transport stops responding after send to port that isn't listening due to ConnectionResetError from WSARecvFrom #127057
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@graingert graingert changed the title gh-127057: Re-arm proactor datagram read loop after a recoverable OSE… gh-127057: Re-arm proactor datagram read loop after a recoverable OSError Aug 31, 2026
@graingert
graingert marked this pull request as ready for review August 31, 2026 17:20
@graingert
graingert requested review from 1st1, asvetlov, kumaraditya303 and willingc as code owners August 31, 2026 17:20
@bedevere-app bedevere-app Bot added the awaiting review label Aug 31, 2026
@graingert graingert added needs backport to 3.13 only security fixes needs backport to 3.14 bugs and security fixes needs backport to 3.15 bugs and security fixes labels Sep 1, 2026
@graingert
pythongh-127057: Re-arm proactor datagram read loop after a recoverab…
eb09595 
…le OSError
@graingert
graingert force-pushed the fix-proactor-udp-connreset branch from e45ba5a to eb09595 Compare September 1, 2026 16:43
@graingert graingert mentioned this pull request Sep 1, 2026
gh-156784: unignore error port unreachable in proactor #156788
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kumaraditya303
kumaraditya303 reviewed Sep 5, 2026
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Comment thread Lib/test/test_asyncio/test_events.py Resolved

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kumaraditya303
kumaraditya303 reviewed Sep 5, 2026
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Comment thread Lib/test/test_asyncio/test_events.py Resolved

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kumaraditya303
kumaraditya303 reviewed Sep 5, 2026
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Comment thread Misc/NEWS.d/next/Library/2026-08-31-00-00-00.gh-issue-127057.N9yg62.rst Resolved

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@kumaraditya303 kumaraditya303 added the topic-asyncio label Sep 5, 2026
graingert added 2 commits September 5, 2026 10:59
@graingert
respond to code review comments
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@graingert
Merge branch 'main' into fix-proactor-udp-connreset
a770a66
@graingert

graingert commented Sep 5, 2026

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@kumaraditya303 thanks for the review!
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kumaraditya303
kumaraditya303 reviewed Sep 5, 2026
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Comment thread Lib/asyncio/proactor_events.py Resolved

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graingert
graingert commented Sep 5, 2026
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Comment thread Lib/asyncio/proactor_events.py Resolved

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graingert and others added 2 commits September 5, 2026 11:02
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@graingert @kumaraditya303
Update Lib/asyncio/proactor_events.py
f2afd28 
Co-authored-by: Kumar Aditya <[email protected]>
kumaraditya303
kumaraditya303 reviewed Sep 5, 2026
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Comment thread Lib/asyncio/proactor_events.py Resolved

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graingert
graingert commented Sep 5, 2026
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Comment thread Lib/asyncio/proactor_events.py Resolved

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Apply suggestion from @graingert
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@graingert graingert closed this Sep 5, 2026
@graingert graingert reopened this Sep 5, 2026
@graingert
only retry known recoverable errors
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kumaraditya303
kumaraditya303 approved these changes Sep 5, 2026
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@bedevere-app bedevere-app Bot added awaiting merge and removed awaiting review labels Sep 5, 2026
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kumaraditya303 enabled auto-merge (squash) September 5, 2026 10:50
@kumaraditya303
kumaraditya303 merged commit 0ea2971 into python:main Sep 5, 2026
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@miss-islington-app

miss-islington-app Bot commented Sep 5, 2026

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Thanks @graingert for the PR, and @kumaraditya303 for merging it 🌮🎉.. I'm working now to backport this PR to: 3.13, 3.14, 3.15.
🐍🍒⛏🤖 I'm not a witch! I'm not a witch!
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@bedevere-app bedevere-app Bot removed the awaiting merge label Sep 5, 2026
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bedevere-app Bot commented Sep 5, 2026

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GH-156976 is a backport of this pull request to the 3.15 branch.
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@bedevere-app bedevere-app Bot removed the needs backport to 3.15 bugs and security fixes label Sep 5, 2026
@bedevere-app

bedevere-app Bot commented Sep 5, 2026

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GH-156977 is a backport of this pull request to the 3.14 branch.
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@bedevere-app bedevere-app Bot removed the needs backport to 3.14 bugs and security fixes label Sep 5, 2026
@bedevere-app

bedevere-app Bot commented Sep 5, 2026

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GH-156978 is a backport of this pull request to the 3.13 branch.
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@bedevere-app bedevere-app Bot removed the needs backport to 3.13 only security fixes label Sep 5, 2026
kumaraditya303 pushed a commit that referenced this pull request Sep 5, 2026
@miss-islington @graingert
[3.14] gh-127057: reschedule proactor datagram read loop after Connec…
9e97d9f 
…tionResetError (GH-156726) (#156977)

gh-127057: reschedule proactor datagram read loop after ConnectionResetError  (GH-156726)
(cherry picked from commit 0ea2971)

Co-authored-by: Thomas Grainger <[email protected]>
kumaraditya303 pushed a commit that referenced this pull request Sep 5, 2026
@miss-islington @graingert
[3.13] gh-127057: reschedule proactor datagram read loop after Connec…
ffa12f7 
…tionResetError (GH-156726) (#156978)

gh-127057: reschedule proactor datagram read loop after ConnectionResetError  (GH-156726)
(cherry picked from commit 0ea2971)

Co-authored-by: Thomas Grainger <[email protected]>
hugovk pushed a commit that referenced this pull request Sep 5, 2026
@miss-islington @graingert
[3.15] gh-127057: reschedule proactor datagram read loop after Connec…
4387744 
…tionResetError (GH-156726) (#156976)

gh-127057: reschedule proactor datagram read loop after ConnectionResetError  (GH-156726)
(cherry picked from commit 0ea2971)

Co-authored-by: Thomas Grainger <[email protected]>
clin1234 pushed a commit to clin1234/cpython that referenced this pull request Sep 12, 2026
@graingert @clin1234
pythongh-127057: reschedule proactor datagram read loop after Connect…
2150ba8 
…ionResetError (python#156726)
@graingert
graingert deleted the fix-proactor-udp-connreset branch September 16, 2026 10:44
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@kumaraditya303 kumaraditya303 kumaraditya303 approved these changes
@1st1 1st1 Awaiting requested review from 1st1 1st1 is a code owner
@asvetlov asvetlov Awaiting requested review from asvetlov asvetlov is a code owner
@willingc willingc Awaiting requested review from willingc willingc is a code owner

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@graingert @kumaraditya303
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