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gh-159111: Add missing downstream changes when upgrade to 2.5.2. - #160207

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Oct 22, 2026
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@corona10 corona10 commented Oct 22, 2026 •

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corona10 requested a review from AA-Turner as a code owner October 22, 2026 05:49
@bedevere-app bedevere-app Bot added the type-feature A feature request or enhancement label Oct 22, 2026
@corona10 corona10 added skip news and removed type-feature A feature request or enhancement labels Oct 22, 2026
Comment thread Doc/whatsnew/3.16.rst

(Contributed by Stan Ulbrych, Florian Mayer and AnnaAr321 in :gh:`156049`.)

* Update the bundled `mimalloc library`_ from version 2.1.2 to 2.5.2.

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Forgot to remove this entry, remove this entry since we are going to target v3 cc @DinoV

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Documentation build overview

📚 cpython-previews | 🛠️ Build #35316643 | 📁 Comparing 130a1a1 against main (c58b713)

  🔍 Preview build  

1 file changed
± whatsnew/3.16.html

@corona10
corona10 merged commit 9f3d506 into python:main Oct 22, 2026
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⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Windows PGO 3.x (tier-1) has failed when building commit 9f3d506.

What do you need to do:

  1. Don't panic.
  2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
  3. Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/1620/builds/4737) and take a look at the build logs.
  4. Check if the failure is related to this commit (9f3d506) or if it is a false positive.
  5. 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/1620/builds/4737

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

Click to see traceback logs
remote: Enumerating objects: 40, done.        
remote: Counting objects:   2% (1/40)        
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remote: Counting objects: 100% (40/40)        
remote: Counting objects: 100% (40/40), done.        
remote: Compressing objects:  50% (1/2)        
remote: Compressing objects: 100% (2/2)        
remote: Compressing objects: 100% (2/2), done.        
remote: Total 22 (delta 19), reused 22 (delta 19), pack-reused 0 (from 0)        
From https://github.com/python/cpython
 * branch                    main       -> FETCH_HEAD
Note: switching to '9f3d5067f389cf60745a1ff23c69029772632f62'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by switching back to a branch.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -c with the switch command. Example:

  git switch -c <new-branch-name>

Or undo this operation with:

  git switch -

Turn off this advice by setting config variable advice.detachedHead to false

HEAD is now at 9f3d5067f38 gh-159111: Add missing downstream changes when upgrade to 2.5.2. (gh-160207)
Switched to and reset branch 'main'

Could Not Find D:\buildarea\3.x.bolen-windows10.pgo\build\PCbuild\*.pgc
Could Not Find D:\buildarea\3.x.bolen-windows10.pgo\build\Lib\*.pyc
Could Not Find D:\buildarea\3.x.bolen-windows10.pgo\build\PCbuild\*.pgc
Could Not Find D:\buildarea\3.x.bolen-windows10.pgo\build\Lib\*.pyc
Could Not Find D:\buildarea\3.x.bolen-windows10.pgo\build\Lib\*.pyc
The system cannot find the file specified.
Could Not Find D:\buildarea\3.x.bolen-windows10.pgo\build\PCbuild\python*.zip
Could Not Find D:\buildarea\3.x.bolen-windows10.pgo\build\PCbuild\*.pgc
Could Not Find D:\buildarea\3.x.bolen-windows10.pgo\build\Lib\*.pyc

Could Not Find D:\buildarea\3.x.bolen-windows10.pgo\build\PCbuild\python*.zip

Expanding reachable commits in commit graph: 95482
Expanding reachable commits in commit graph: 168527, done.

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