GV

GeezerVison

The World Wide Web, restored to 800 pixels of glory.

Home|About|Gaming cabinet|Archives|How it works|Starter sites

On this site

  • Sign in
  • ActionsCI/CD and automation
  • CodespacesCloud development environments
  • All Features
  • Documentation
  • Training
  • Certifications
  • Build with Copilot
  • Customize Copilot
  • Integrations
  • Trending repos
  • GitHub Sponsors
  • Developer articles
  • Enterprises

This view

  • Original page
  • New address

GeezerVison is showing github.com — gh-135228: When @dataclass(slots=True) replaces a dataclass, make the original class collectible (take 2) by JelleZijlstra · Pull Request #137047 · python/cpython

Conversation

@JelleZijlstra

@JelleZijlstra JelleZijlstra commented Jul 23, 2025 •
edited by bedevere-app Bot
Loading

Uh oh!

There was an error while loading. Please reload this page.

Copy link
Copy Markdown
Member

This is a redo of #136893 without relying on a hack to get to the type dictionary.

  • Issue: 3.14 regression: slot dataclasses classes leak original class #135228

Sorry, something went wrong.

Uh oh!

There was an error while loading. Please reload this page.
All reactions
JelleZijlstra and others added 3 commits July 23, 2025 08:13
@JelleZijlstra @ncoghlan
pythongh-135228: When @DataClass(slots=True) replaces a dataclass, ma…
916ce1b 
…ke the original class collectible (python#136893)

An interesting hack, but more localized in scope than python#135230.

This may be a breaking change if people intentionally keep the original class around
when using `@dataclass(slots=True)`, and then use `__dict__` or `__weakref__` on the
original class.

Co-authored-by: Alyssa Coghlan <[email protected]>
@JelleZijlstra
Use a new private sys function instead
6dc0f48
@JelleZijlstra
obsolete comment
b9fb155
@JelleZijlstra
JelleZijlstra requested review from ericsnowcurrently and ericvsmith as code owners July 23, 2025 15:43
@JelleZijlstra JelleZijlstra added the needs backport to 3.14 bugs and security fixes label Jul 23, 2025
@bedevere-app bedevere-app Bot added the awaiting core review label Jul 23, 2025
@bedevere-app bedevere-app Bot mentioned this pull request Jul 23, 2025
3.14 regression: slot dataclasses classes leak original class #135228
Closed
JelleZijlstra
JelleZijlstra commented Jul 23, 2025
View reviewed changes
Comment thread Python/sysmodule.c Resolved

Uh oh!

There was an error while loading. Please reload this page.
serhiy-storchaka
serhiy-storchaka reviewed Jul 23, 2025
View reviewed changes

@serhiy-storchaka serhiy-storchaka left a comment

Copy link
Copy Markdown
Member

There was a problem hiding this comment.

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Can we check that this is a Python class? Should we clear the whole class dict or set it to NULL for the case if there are more descriptors?

Sorry, something went wrong.

Uh oh!

There was an error while loading. Please reload this page.
All reactions
@JelleZijlstra

JelleZijlstra commented Jul 23, 2025

Copy link
Copy Markdown
Member Author

Can we check that this is a Python class?

Maybe we can check that it's a heap type?

Should we clear the whole class dict or set it to NULL for the case if there are more descriptors?

I'm not aware of other descriptors that could cause problems. It's better to minimize the amount of changes we make to the class, because there are edge cases where the class is still accessible after the dataclass transformation is applied.
All reactions

Sorry, something went wrong.

Uh oh!

There was an error while loading. Please reload this page.
JelleZijlstra added 2 commits July 23, 2025 14:20
@JelleZijlstra
restrict to heap types
52c7d2b
@JelleZijlstra
more paranoid
250f3e9
encukou
encukou reviewed Jul 29, 2025
View reviewed changes
Comment thread Python/sysmodule.c Resolved

Uh oh!

There was an error while loading. Please reload this page.
serhiy-storchaka
serhiy-storchaka reviewed Jul 29, 2025
View reviewed changes
Comment thread Python/sysmodule.c Resolved

Uh oh!

There was an error while loading. Please reload this page.
Comment thread Python/sysmodule.c Resolved

Uh oh!

There was an error while loading. Please reload this page.
@JelleZijlstra @encukou @serhiy-storchaka
Apply suggestions from code review
a9483b4 
Co-authored-by: Petr Viktorin <[email protected]>
Co-authored-by: Serhiy Storchaka <[email protected]>
JelleZijlstra
JelleZijlstra commented Jul 30, 2025
View reviewed changes
Comment thread Python/sysmodule.c Resolved

Uh oh!

There was an error while loading. Please reload this page.
@JelleZijlstra
Update Python/sysmodule.c
8c2c1e1
@JelleZijlstra

JelleZijlstra commented Aug 5, 2025

Copy link
Copy Markdown
Member Author

@encukou @serhiy-storchaka could you review again and approve if you're satisfied, so that we can get this fixed in 3.14?
All reactions

Sorry, something went wrong.

Uh oh!

There was an error while loading. Please reload this page.
encukou
encukou reviewed Aug 5, 2025
View reviewed changes

@encukou encukou left a comment

Copy link
Copy Markdown
Member

There was a problem hiding this comment.

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I can't find any issues in the PR; this is pretty much is the local optimum.
But, I can't tell if there will be unintended consequences. This PR feels quite risky for a RC fix.

Docs-wise: the notes/comments shouldn't imply that the original class is guaranteed to be garbage collected -- something else could still keep it alive.

Sorry, something went wrong.

Uh oh!

There was an error while loading. Please reload this page.
All reactions
Comment thread Lib/dataclasses.py Resolved

Uh oh!

There was an error while loading. Please reload this page.
Comment thread Misc/NEWS.d/next/Library/2025-07-20-16-56-55.gh-issue-135228.n_XIao.rst Resolved

Uh oh!

There was an error while loading. Please reload this page.
@JelleZijlstra
Feedback from Petr
2d3bd7c
@encukou

encukou commented Aug 11, 2025

Copy link
Copy Markdown
Member

@hugovk Your thoughts on this?

IMO: If we weren't in RC period, I'd push for #136966, which is IMO a (slight) improvement on its own. But, it has a higher risk of unknown unknowns.
For backporting to 3.14.0, this dataclasses-specific workaround is probably better. But, all of it is a band-aid.
serhiy-storchaka reacted with thumbs up emoji
All reactions
  • 👍 1 reaction

Sorry, something went wrong.

Uh oh!

There was an error while loading. Please reload this page.
serhiy-storchaka
serhiy-storchaka approved these changes Aug 11, 2025
View reviewed changes

@serhiy-storchaka serhiy-storchaka left a comment

Copy link
Copy Markdown
Member

There was a problem hiding this comment.

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I agree with @encukou. #136966 may be better in long perspective (or it may be a move in right direction), but this change has more limited impact, and therefore lokks safer. We always can backport #136966 if we test it well.

Sorry, something went wrong.

Uh oh!

There was an error while loading. Please reload this page.
All reactions
Comment thread Python/sysmodule.c Resolved

Uh oh!

There was an error while loading. Please reload this page.
Comment thread Python/sysmodule.c Resolved

Uh oh!

There was an error while loading. Please reload this page.
@bedevere-app bedevere-app Bot added awaiting merge and removed awaiting core review labels Aug 11, 2025
@JelleZijlstra
use AC for type checking
06618d8
@JelleZijlstra

JelleZijlstra commented Aug 12, 2025

Copy link
Copy Markdown
Member Author

I also agree that #136966 is a better long-term solution; we can merge it into 3.15 after this goes in, and we can also consider using it in 3.14.1.
All reactions

Sorry, something went wrong.

Uh oh!

There was an error while loading. Please reload this page.
serhiy-storchaka
serhiy-storchaka approved these changes Aug 12, 2025
View reviewed changes
@encukou

encukou commented Aug 12, 2025

Copy link
Copy Markdown
Member

Let's go then.
All reactions

Sorry, something went wrong.

Uh oh!

There was an error while loading. Please reload this page.
@encukou
encukou merged commit 6859b95 into python:main Aug 12, 2025
@bedevere-app bedevere-app Bot removed the awaiting merge label Aug 12, 2025
@miss-islington-app

miss-islington-app Bot commented Aug 12, 2025

Copy link
Copy Markdown

Thanks @JelleZijlstra for the PR, and @encukou for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14.
🐍🍒⛏🤖
All reactions

Sorry, something went wrong.

Uh oh!

There was an error while loading. Please reload this page.
miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Aug 12, 2025
@JelleZijlstra @ncoghlan
@encukou @serhiy-storchaka @miss-islington
pythongh-135228: When @DataClass(slots=True) replaces a dataclass, ma…
d764eb6 
…ke the original class collectible (take 2) (pythonGH-137047)

Remove the `__dict__` and `__weakref__` descriptors from the original class when creating a dataclass from it.

An interesting hack, but more localized in scope than pythongh-135230.

This may be a breaking change if people intentionally keep the original class around
when using `@dataclass(slots=True)`, and then use `__dict__` or `__weakref__` on the
original class.

(cherry picked from commit 6859b95)

Co-authored-by: Jelle Zijlstra <[email protected]>
Co-authored-by: Alyssa Coghlan <[email protected]>
Co-authored-by: Petr Viktorin <[email protected]>
Co-authored-by: Serhiy Storchaka <[email protected]>
@bedevere-app

bedevere-app Bot commented Aug 12, 2025

Copy link
Copy Markdown

GH-137666 is a backport of this pull request to the 3.14 branch.
All reactions

Sorry, something went wrong.

Uh oh!

There was an error while loading. Please reload this page.
@bedevere-app bedevere-app Bot removed the needs backport to 3.14 bugs and security fixes label Aug 12, 2025
@hugovk

hugovk commented Aug 12, 2025 •
edited
Loading

Uh oh!

There was an error while loading. Please reload this page.

Copy link
Copy Markdown
Member

Thanks all, let's do this fix for RC2 -- I'll merge the backport #137666 once tests pass and it's approved.

And do #136966 for 3.15 and possibly 3.14.1.
All reactions

Sorry, something went wrong.

Uh oh!

There was an error while loading. Please reload this page.
@bedevere-bot

bedevere-bot commented Aug 12, 2025

Copy link
Copy Markdown

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot aarch64 Fedora Stable LTO + PGO 3.x (tier-2) has failed when building commit 6859b95.

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/524/builds/8141) and take a look at the build logs.
  4. Check if the failure is related to this commit (6859b95) 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/524/builds/8141

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

Click to see traceback logs 
remote: Enumerating objects: 14, done.        
remote: Counting objects:   9% (1/11)        
remote: Counting objects:  18% (2/11)        
remote: Counting objects:  27% (3/11)        
remote: Counting objects:  36% (4/11)        
remote: Counting objects:  45% (5/11)        
remote: Counting objects:  54% (6/11)        
remote: Counting objects:  63% (7/11)        
remote: Counting objects:  72% (8/11)        
remote: Counting objects:  81% (9/11)        
remote: Counting objects:  90% (10/11)        
remote: Counting objects: 100% (11/11)        
remote: Counting objects: 100% (11/11), done.        
remote: Compressing objects:  11% (1/9)        
remote: Compressing objects:  22% (2/9)        
remote: Compressing objects:  33% (3/9)        
remote: Compressing objects:  44% (4/9)        
remote: Compressing objects:  55% (5/9)        
remote: Compressing objects:  66% (6/9)        
remote: Compressing objects:  77% (7/9)        
remote: Compressing objects:  88% (8/9)        
remote: Compressing objects: 100% (9/9)        
remote: Compressing objects: 100% (9/9), done.        
remote: Total 14 (delta 2), reused 2 (delta 2), pack-reused 3 (from 1)        
From https://github.com/python/cpython
 * branch                    main       -> FETCH_HEAD
Note: switching to '6859b95cfff26c9ef52c5535d2b3662f17ff5b3d'.

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 6859b95cfff gh-135228: When @dataclass(slots=True) replaces a dataclass, make the original class collectible (take 2) (GH-137047)
Switched to and reset branch 'main'

find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
make[2]: [Makefile:3379: clean-retain-profile] Error 1 (ignored)
Python/ceval.c: In function ‘_PyEvalFramePushAndInit_Ex’:
Python/ceval.c:1917:38: warning: ‘stack_array’ may be used uninitialized [-Wmaybe-uninitialized]
 1917 |     _PyInterpreterFrame *new_frame = _PyEvalFramePushAndInit(
      |                                      ^~~~~~~~~~~~~~~~~~~~~~~~
 1918 |         tstate, func, locals,
      |         ~~~~~~~~~~~~~~~~~~~~~         
 1919 |         newargs, nargs, kwnames, previous
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 1920 |     );
      |     ~                                 
Python/ceval.c:1840:1: note: by argument 4 of type ‘const union _PyStackRef *’ to ‘_PyEvalFramePushAndInit’ declared here
 1840 | _PyEvalFramePushAndInit(PyThreadState *tstate, _PyStackRef func,
      | ^~~~~~~~~~~~~~~~~~~~~~~
Python/ceval.c:1886:17: note: ‘stack_array’ declared here
 1886 |     _PyStackRef stack_array[8];
      |                 ^~~~~~~~~~~
/usr/bin/ld: error in /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o)(.eh_frame); no .eh_frame_hdr table will be created
/usr/bin/ld: error in /usr/lib/gcc/aarch64-redhat-linux/15/libgcc.a(sync-cache.o)(.eh_frame); no .eh_frame_hdr table will be created
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 1090522845 >= 662 for section `.strtab'
/usr/bin/ld: /usr/lib/gcc/aarch64-redhat-linux/15/libgcov.a(_gcov.o): invalid string offset 3236147 >= 662 for section `.strtab'
collect2: fatal error: ld terminated with signal 11 [Segmentation fault], core dumped
compilation terminated.
make[2]: *** [Makefile:1146: python] Error 1
make[1]: *** [Makefile:1005: profile-gen-stamp] Error 2
make: *** [Makefile:1017: profile-run-stamp] Error 2
All reactions

Sorry, something went wrong.

Uh oh!

There was an error while loading. Please reload this page.
@hugovk

hugovk commented Aug 12, 2025

Copy link
Copy Markdown
Member

Same buildbot passed on the backport:

  • [3.14] gh-135228: When @dataclass(slots=True) replaces a dataclass, make the original class collectible (take 2) (GH-137047) #137666
  • https://buildbot.python.org/#/builders/818/builds/1428
All reactions

Sorry, something went wrong.

Uh oh!

There was an error while loading. Please reload this page.
hugovk pushed a commit that referenced this pull request Aug 12, 2025
@miss-islington @JelleZijlstra
@ncoghlan @encukou @serhiy-storchaka
[3.14] gh-135228: When @DataClass(slots=True) replaces a dataclass, m…
4dda176 
…ake the original class collectible (take 2) (GH-137047) (#137666)

Co-authored-by: Jelle Zijlstra <[email protected]>
Co-authored-by: Alyssa Coghlan <[email protected]>
Co-authored-by: Petr Viktorin <[email protected]>
Co-authored-by: Serhiy Storchaka <[email protected]>
@encukou encukou mentioned this pull request Aug 12, 2025
gh-135228: Create __dict__ and __weakref__ descriptors for object #136966
Merged
maurycy added a commit to maurycy/cpython that referenced this pull request Aug 12, 2025
@maurycy
Merge branch 'main' into csv-sniffer-counter-set
11c891d 
* main:
  pythongh-137288: Update 3.14 magic numbers (pythonGH-137665)
  pythongh-135228: When @DataClass(slots=True) replaces a dataclass, make the original class collectible (take 2) (pythonGH-137047)
  pythongh-126008: Improve docstrings for Tkinter cget and configure methods (pythonGH-133303)
  pythongh-131885: Use positional-only markers for ``max()`` and ``min()`` (python#131868)
  pythonGH-137426: Remove code deprecation of `importlib.abc.ResourceLoader` (pythonGH-137567)
  pythongh-125897: Mark range function parameters as positional only (python#125945)
  pythongh-137400: Fix a crash when disabling profiling across all threads (pythongh-137471)
  pythongh-115766: Fix IPv4Interface.is_unspecified (pythonGH-137326)
  pythongh-128813: cleanup C-API docs for PyComplexObject (pythonGH-137579)
  pythongh-135953: Profile a module or script with sampling profiler (python#136777)
  Fix documentation of hash in PyHash_FuncDef (python#137595)
encukou added a commit that referenced this pull request Aug 18, 2025
@encukou @JelleZijlstra
gh-135228: Create __dict__ and __weakref__ descriptors for object (GH…
7dfa048 
…-136966)

This partially reverts #137047, keeping the tests for GC collectability of the
original class that dataclass adds `__slots__` to.
The reference leaks solved there are instead solved by having the `__dict__` &
`__weakref__` descriptors not tied to (and referencing) their class.

Instead, they're shared between all classes that need them (within
an interpreter).
The `__objclass__` ol the descriptors is set to `object`, since these
descriptors work with *any* object. (The appropriate checks were already
made in the get/set code, so the `__objclass__` check was redundant.)

The repr of these descriptors (and any others whose `__objclass__` is `object`)
now doesn't mention the objclass.

This change required adjustment of introspection code that checks
`__objclass__` to determine an object's “own” (i.e. not inherited) `__dict__`.
Third-party code that does similar introspection of the internals will also
need adjusting.


Co-authored-by: Jelle Zijlstra <[email protected]>
Agent-Hellboy pushed a commit to Agent-Hellboy/cpython that referenced this pull request Aug 19, 2025
@JelleZijlstra @ncoghlan
@encukou @serhiy-storchaka @Agent-Hellboy
pythongh-135228: When @DataClass(slots=True) replaces a dataclass, ma…
5e78b22 
…ke the original class collectible (take 2) (pythonGH-137047)

Remove the `__dict__` and `__weakref__` descriptors from the original class when creating a dataclass from it.

An interesting hack, but more localized in scope than pythongh-135230.

This may be a breaking change if people intentionally keep the original class around
when using `@dataclass(slots=True)`, and then use `__dict__` or `__weakref__` on the
original class.


Co-authored-by: Alyssa Coghlan <[email protected]>
Co-authored-by: Petr Viktorin <[email protected]>
Co-authored-by: Serhiy Storchaka <[email protected]>
Agent-Hellboy pushed a commit to Agent-Hellboy/cpython that referenced this pull request Aug 19, 2025
@encukou @JelleZijlstra @Agent-Hellboy
pythongh-135228: Create __dict__ and __weakref__ descriptors for obje…
a2ba4a5 
…ct (pythonGH-136966)

This partially reverts python#137047, keeping the tests for GC collectability of the
original class that dataclass adds `__slots__` to.
The reference leaks solved there are instead solved by having the `__dict__` &
`__weakref__` descriptors not tied to (and referencing) their class.

Instead, they're shared between all classes that need them (within
an interpreter).
The `__objclass__` ol the descriptors is set to `object`, since these
descriptors work with *any* object. (The appropriate checks were already
made in the get/set code, so the `__objclass__` check was redundant.)

The repr of these descriptors (and any others whose `__objclass__` is `object`)
now doesn't mention the objclass.

This change required adjustment of introspection code that checks
`__objclass__` to determine an object's “own” (i.e. not inherited) `__dict__`.
Third-party code that does similar introspection of the internals will also
need adjusting.


Co-authored-by: Jelle Zijlstra <[email protected]>
kumaraditya303 pushed a commit to miss-islington/cpython that referenced this pull request Sep 9, 2025
@miss-islington @JelleZijlstra
@ncoghlan @encukou @serhiy-storchaka @kumaraditya303
[3.14] pythongh-135228: When @DataClass(slots=True) replaces a datacl…
4bd33e9 
…ass, make the original class collectible (take 2) (pythonGH-137047) (python#137666)

Co-authored-by: Jelle Zijlstra <[email protected]>
Co-authored-by: Alyssa Coghlan <[email protected]>
Co-authored-by: Petr Viktorin <[email protected]>
Co-authored-by: Serhiy Storchaka <[email protected]>
gpshead added a commit to gpshead/cpython that referenced this pull request Apr 12, 2026
@gpshead @Prometheus3375 @claude
[3.13] pythongh-105936: Properly update closure cells for `__setattr_…
aa1e00f 
…_` and `__delattr__` in frozen dataclasses with slots (pythonGH-144021)

pythongh-105936: Properly update closure cells for `__setattr__` and `__delattr__` in frozen dataclasses with slots (pythonGH-144021)
(cherry picked from commit 8a398bf)

The cherry-pick required additional changes beyond the original commit
because 3.13 lacks the `__class__` closure cell fixup machinery that
was added in 3.14 by pythonGH-124455 (pythongh-90562). Specifically:

- Backported `_update_func_cell_for__class__()` helper function and the
  closure fixup loop in `_add_slots()` from pythonGH-124455. Without these,
  renaming the closure variable from `cls` to `__class__` has no effect
  because nothing updates the cell when the class is recreated with slots.
- Changed `_add_slots()` to use `newcls` instead of reusing `cls` for the
  recreated class, so both old and new class references are available for
  the fixup loop.
- Replaced `assertNotHasAttr` with `assertFalse(hasattr(...))` in tests
  (assertNotHasAttr was added in 3.14).
- Dropped `test_original_class_is_gced` additions (that test does not
  exist on 3.13; it was added by pythonGH-137047 for pythongh-135228 which was not
  backported to 3.13).

Co-authored-by: Prometheus3375 <[email protected]>
Co-authored-by: Sviataslau <[email protected]>
Co-authored-by: Claude Opus 4.6 (1M context) <[email protected]>
@gpshead gpshead mentioned this pull request Apr 12, 2026
[3.13] gh-105936: Properly update closure cells for __setattr__ and __delattr__ in frozen dataclasses with slots (GH-144021) #148476
Merged
gpshead added a commit that referenced this pull request Apr 26, 2026
@gpshead @Prometheus3375
@JelleZijlstra @johnslavik
[3.13] gh-105936: Properly update closure cells for __setattr__ and _…
9651429 
…_delattr__ in frozen dataclasses with slots (GH-144021) (GH-148476)

gh-105936: Properly update closure cells for `__setattr__` and `__delattr__` in frozen dataclasses with slots (GH-144021)
(cherry picked from commit 8a398bf)

The cherry-pick required additional changes beyond the original commit
because 3.13 lacks the `__class__` closure cell fixup machinery that
was added in 3.14 by GH-124455 (gh-90562). Specifically:

- Backported `_update_func_cell_for__class__()` helper function and the
  closure fixup loop in `_add_slots()` from GH-124455. Without these,
  renaming the closure variable from `cls` to `__class__` has no effect
  because nothing updates the cell when the class is recreated with slots.
- Changed `_add_slots()` to use `newcls` instead of reusing `cls` for the
  recreated class, so both old and new class references are available for
  the fixup loop.
- Replaced `assertNotHasAttr` with `assertFalse(hasattr(...))` in tests
  (assertNotHasAttr was added in 3.14).
- Dropped `test_original_class_is_gced` additions (that test does not
  exist on 3.13; it was added by GH-137047 for gh-135228 which was not
  backported to 3.13).

gh-148947: dataclasses: fix error on empty __class__ cell  (GH-148948)

Also add a test demonstrating the need for the existing "is oldcls" check.
(cherry picked from commit 6d7bbee)

---------

Co-authored-by: Prometheus3375 <[email protected]>
Co-authored-by: Sviataslau <[email protected]>
Co-authored-by: Jelle Zijlstra <[email protected]>
Co-authored-by: Bartosz Sławecki <[email protected]>
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Reviewers

@encukou encukou encukou left review comments
@brandtbucher brandtbucher brandtbucher left review comments
@serhiy-storchaka serhiy-storchaka serhiy-storchaka approved these changes
@ericvsmith ericvsmith Awaiting requested review from ericvsmith ericvsmith is a code owner
@ericsnowcurrently ericsnowcurrently Awaiting requested review from ericsnowcurrently ericsnowcurrently is a code owner

Uh oh!

There was an error while loading. Please reload this page.

Assignees

No one assigned

Labels

None yet

Projects

None yet

Milestone

No milestone

Development

Successfully merging this pull request may close these issues.

Uh oh!

There was an error while loading. Please reload this page.

6 participants

@JelleZijlstra @encukou @hugovk @bedevere-bot @serhiy-storchaka @brandtbucher
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
You are visitor 01402503 — GeezerVison does not store the pages you look up.
Best viewed with Netscape Navigator 4.7 or Internet Explorer 6 at 800×600. No cookies required.