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GeezerVison is showing github.com — gh-142516: fix reference leaks in `ssl.SSLContext` objects by picnixz · Pull Request #143685 · python/cpython

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picnixz commented Jan 11, 2026 •

edited by bedevere-app Bot

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I don't think it'll fix all the issues but at least it will fix some issues on SSL contexts.

Issue: Observed memory leak in ssl library: Python 3.14 GC issue #142516

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          pythongh-142516: fix reference leaks in ssl.SSLContext objects

cfca05f

picnixz requested a review from gpshead as a code owner

January 11, 2026 12:06

bedevere-app Bot mentioned this pull request

Jan 11, 2026

Observed memory leak in ssl library: Python 3.14 GC issue #142516

Closed

bedevere-app Bot added the awaiting core review label

Jan 11, 2026

picnixz force-pushed the fix/ssl/leak-gc-142516 branch 3 times, most recently from d32e7bb to b7fa115 Compare

January 11, 2026 12:17

picnixz added 2 commits

January 11, 2026 13:17


          test! add regression tests

ba02a26


          chore! NEWS entry

6b08305

picnixz force-pushed the fix/ssl/leak-gc-142516 branch from b7fa115 to 6b08305 Compare

January 11, 2026 12:17

picnixz added the 🔨 test-with-refleak-buildbots Test PR w/ refleak buildbots; report in status section label

Jan 11, 2026

bedevere-bot commented Jan 11, 2026

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🤖 New build scheduled with the buildbot fleet by @picnixz for commit 6b08305 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F143685%2Fmerge

If you want to schedule another build, you need to add the 🔨 test-with-refleak-buildbots label again.

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bedevere-bot removed the 🔨 test-with-refleak-buildbots Test PR w/ refleak buildbots; report in status section label

Jan 11, 2026

picnixz changed the title ~~gh-142516: fix reference leaks in ssl objects~~ gh-142516: fix reference leaks in ssl.SSLContext objects

Jan 11, 2026


          fix tests on Windows

57d4fba

picnixz commented Jan 18, 2026

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When I am back home I will update the PR

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          Merge branch 'main' into fix/ssl/leak-gc-142516

9083a84

picnixz marked this pull request as draft

February 7, 2026 11:07

bedevere-app Bot removed the awaiting core review label

Feb 7, 2026


          post-merge

02226ce

picnixz marked this pull request as ready for review

February 7, 2026 11:08

bedevere-app Bot added the awaiting core review label

Feb 7, 2026

picnixz added the 🔨 test-with-refleak-buildbots Test PR w/ refleak buildbots; report in status section label

Feb 7, 2026

bedevere-bot commented Feb 7, 2026

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🤖 New build scheduled with the buildbot fleet by @picnixz for commit 02226ce 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F143685%2Fmerge

If you want to schedule another build, you need to add the 🔨 test-with-refleak-buildbots label again.

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bedevere-bot removed the 🔨 test-with-refleak-buildbots Test PR w/ refleak buildbots; report in status section label

Feb 7, 2026

picnixz added needs backport to 3.13

only security fixes

needs backport to 3.14 bugs and security fixes and removed needs backport to 3.13

only security fixes

needs backport to 3.14 bugs and security fixes labels

Feb 7, 2026

picnixz commented Feb 7, 2026

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Actually I will do the backports manually later. Too many conflicts.

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picnixz merged commit 3a2a686 into python:main

Feb 21, 2026

72 checks passed

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bedevere-app Bot removed the awaiting core review label

Feb 21, 2026

picnixz deleted the fix/ssl/leak-gc-142516 branch

February 21, 2026 11:31

picnixz added a commit to picnixz/cpython that referenced this pull request

Feb 21, 2026


          [3.14] pythongh-142516: fix reference leaks in ssl.SSLContext objec…

4607b00

…ts (pythonGH-143685)

(cherry picked from commit 3a2a686)

Co-authored-by: Bénédikt Tran <[email protected]>

bedevere-app Bot commented Feb 21, 2026

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GH-145075 is a backport of this pull request to the 3.14 branch.

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gpshead reviewed

Feb 21, 2026

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thanks!

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gpshead pushed a commit that referenced this pull request

Feb 21, 2026


          [3.14] gh-142516: fix reference leaks in ssl.SSLContext objects (GH…

1decc7e

…-143685) (#145075)

* [3.14] gh-142516: fix reference leaks in `ssl.SSLContext` objects (GH-143685)
(cherry picked from commit 3a2a686)

Co-authored-by: Bénédikt Tran <[email protected]>

* fix backport

bedevere-bot commented Feb 21, 2026

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⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 FreeBSD Refleaks 3.14 (tier-3) has failed when building commit 1decc7e.

What do you need to do:

Don't panic.
Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/1800/builds/1014) and take a look at the build logs.
Check if the failure is related to this commit (1decc7e) or if it is a false positive.
If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#/builders/1800/builds/1014

Test leaking resources:

test_events: memory blocks

Summary of the results of the build (if available):

Click to see traceback logs

Traceback (most recent call last):
  File "/buildbot/buildarea/3.14.ware-freebsd.refleak/build/Lib/test/support/__init__.py", line 859, in gc_collect
    gc.collect()
ResourceWarning: unclosed <socket.socket fd=9, family=2, type=1, proto=6, laddr=('127.0.0.1', 59018), raddr=('127.0.0.1', 59019)>
Task was destroyed but it is pending!
task: <Task pending name='Task-2213' coro=<BaseSelectorEventLoop._accept_connection2() done, defined at /buildbot/buildarea/3.14.ware-freebsd.refleak/build/Lib/asyncio/selector_events.py:217> wait_for=<Future pending cb=[Task.task_wakeup()]>>
Warning -- Unraisable exception
Exception ignored while calling deallocator <function _SelectorTransport.__del__ at 0x843ce44d0>:
Traceback (most recent call last):
  File "/buildbot/buildarea/3.14.ware-freebsd.refleak/build/Lib/asyncio/selector_events.py", line 873, in __del__
    _warn(f"unclosed transport {self!r}", ResourceWarning, source=self)
ResourceWarning: unclosed transport <_SelectorSocketTransport closing fd=9>
k


Traceback (most recent call last):
  File "/buildbot/buildarea/3.14.ware-freebsd.refleak/build/Lib/test/support/__init__.py", line 859, in gc_collect
    gc.collect()
ResourceWarning: unclosed <socket.socket fd=9, family=2, type=1, proto=6, laddr=('127.0.0.1', 10128), raddr=('127.0.0.1', 10129)>
Task was destroyed but it is pending!
task: <Task pending name='Task-1257' coro=<BaseSelectorEventLoop._accept_connection2() done, defined at /buildbot/buildarea/3.14.ware-freebsd.refleak/build/Lib/asyncio/selector_events.py:217> wait_for=<Future pending cb=[Task.task_wakeup()]>>
Warning -- Unraisable exception
Exception ignored while calling deallocator <function _SelectorTransport.__del__ at 0x842b784d0>:
Traceback (most recent call last):
  File "/buildbot/buildarea/3.14.ware-freebsd.refleak/build/Lib/asyncio/selector_events.py", line 873, in __del__
    _warn(f"unclosed transport {self!r}", ResourceWarning, source=self)
ResourceWarning: unclosed transport <_SelectorSocketTransport closing fd=9>
k

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brijkapadia pushed a commit to brijkapadia/cpython that referenced this pull request

Feb 28, 2026


          pythongh-142516: fix reference leaks in ssl.SSLContext objects (pyt…

ef867b3

…hon#143685)

picnixz added a commit to picnixz/cpython that referenced this pull request

Apr 11, 2026


          [3.13] pythongh-142516: fix reference leaks in ssl.SSLContext objec…

5aa7ad2

…ts (pythonGH-143685) (pythonGH-145075)

* [3.14] pythongh-142516: fix reference leaks in `ssl.SSLContext` objects (pythonGH-143685)
(cherry picked from commit 3a2a686)

Co-authored-by: Bénédikt Tran <[email protected]>

* fix backport
(cherry picked from commit 1decc7e)

Co-authored-by: Bénédikt Tran <[email protected]>

picnixz added a commit to picnixz/cpython that referenced this pull request

Apr 11, 2026


          [3.14] pythongh-142516: fix reference leaks in ssl.SSLContext objec…

c690e8c

…ts (pythonGH-143685) (python#145075)

* [3.14] pythongh-142516: fix reference leaks in `ssl.SSLContext` objects (pythonGH-143685)
(cherry picked from commit 3a2a686)

Co-authored-by: Bénédikt Tran <[email protected]>

* fix backport

ljfp pushed a commit to ljfp/cpython that referenced this pull request

Apr 25, 2026


          pythongh-142516: fix reference leaks in ssl.SSLContext objects (pyt…

bbaf112

…hon#143685)

picnixz added a commit that referenced this pull request

May 24, 2026


          [3.13] gh-142516: fix reference leaks in ssl.SSLContext objects (GH…

e102378

…-143685) (GH-145075) (#148371)

Cherry picked from commits 3a2a686
and 1decc7e with minor amendments.

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picnixz commented Jan 11, 2026 • edited by bedevere-app Bot Loading Uh oh! There was an error while loading. Please reload this page.

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bedevere-bot commented Jan 11, 2026

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picnixz commented Jan 18, 2026

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bedevere-bot commented Feb 7, 2026

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picnixz commented Feb 7, 2026

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bedevere-app Bot commented Feb 21, 2026

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bedevere-bot commented Feb 21, 2026

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

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picnixz commented Jan 11, 2026 •

edited by bedevere-app Bot

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