gh-144446: Fix thread safety of gi_frame, cr_frame and ag_frame in free-threading by kumaraditya303 · Pull Request #156037 · python/cpython

kumaraditya303 · 2026-08-19T07:16:14Z

Issue: Data races with frame objects #144446

Fixes thread safety of reading gi_frame, cr_frame and ag_frame while the generator is running or finishing in another thread. Previously the reader could create a frame object for an interpreter frame that was concurrently being cleared, or two threads could each create a frame object for the same frame.

The frame object is now created within the generator's critical section, re-checking the frame state after acquiring it so a finished generator returns None instead of a frame for a cleared iframe. Clearing the generator's frame in gen_clear_frame() and clear_gen_frame() now also holds the critical section so it cannot race with the getter. frame->frame_obj is now set with a compare exchange as the running thread can create it without holding the generator's critical section (e.g. through sys._getframe()) — the losing thread discards its frame object and uses the existing one — and it is cleared with an atomic exchange and read with an acquire load.

… in free-threading build

…e-144446.k3QzXa.rst

kumaraditya303 · 2026-08-31T16:26:08Z

ping @mpage for review

mpage · 2026-08-31T21:15:21Z

This looks correct to me. I'm a little worried about the performance impact of adding a _Py_atomic_compare_exchange_ptr on the return path of every Python function, though. I kicked off a benchmarking run to see what the impact is on the benchmark suite.

mpage · 2026-09-01T22:19:21Z

Benchmark results look like a small regression (~1%).

I don't think we need to use an exchange in _PyFrame_ClearExceptCode, though, because access to frame->frame_obj is always mediated by the generator's critical section when _PyFrame_ClearExceptCode is executing. Assuming that's correct, I think the change to _PyFrame_ClearExceptCode can just be:

PyFrameObject *f = FT_ATOMIC_LOAD_PTR_RELAXED(frame->frame_obj);
if (f != NULL) {
    FT_ATOMIC_STORE_PTR_RELAXED(frame->frame_obj, NULL);
    if (!_PyObject_IsUniquelyReferenced((PyObject *)f)) {
        take_ownership(f, frame);
        Py_DECREF(f);
        return;
    }
    Py_DECREF(f);
}

bedevere-bot · 2026-09-02T18:03:33Z

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 CentOS9 NoGIL 3.x (tier-1) has failed when building commit db92901.

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/1609/builds/6887) and take a look at the build logs.
Check if the failure is related to this commit (db92901) 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/1609/builds/6887

Failed tests:

test_cppext

Failed subtests:

test_build - test.test_cppext.TestInteralCAPI.test_build

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

==

Click to see traceback logs

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build/Lib/test/test_cppext/__init__.py", line 146, in test_build
    self.check_build('_testcppext_internal', **kwargs)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build/Lib/test/test_cppext/__init__.py", line 37, in check_build
    self._check_build(extension_name, python_exe,
    ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                      std=std, limited=limited,
                      ^^^^^^^^^^^^^^^^^^^^^^^^^
                      extra_cflags=extra_cflags)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build/Lib/test/test_cppext/__init__.py", line 82, in _check_build
    run_cmd('Install', cmd)
    ~~~~~~~^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build/Lib/test/test_cppext/__init__.py", line 63, in run_cmd
    subprocess.run(cmd, check=True, env=env)
    ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build/Lib/subprocess.py", line 692, in run
    raise CalledProcessError(retcode, process.args,
                             output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command ['/home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build/build/test_python_508950æ/tempcwd/env/bin/python', '-X', 'dev', '-m', 'pip', 'install', '--no-build-isolation', '/home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build/build/test_python_508950æ/tempcwd/pkg', '-v'] returned non-zero exit status 1.


Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build/Lib/test/test_cppext/__init__.py", line 146, in test_build
    self.check_build('_testcppext_internal', **kwargs)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build/Lib/test/test_cppext/__init__.py", line 37, in check_build
    self._check_build(extension_name, python_exe,
    ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                      std=std, limited=limited,
                      ^^^^^^^^^^^^^^^^^^^^^^^^^
                      extra_cflags=extra_cflags)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build/Lib/test/test_cppext/__init__.py", line 82, in _check_build
    run_cmd('Install', cmd)
    ~~~~~~~^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build/Lib/test/test_cppext/__init__.py", line 63, in run_cmd
    subprocess.run(cmd, check=True, env=env)
    ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build/Lib/subprocess.py", line 692, in run
    raise CalledProcessError(retcode, process.args,
                             output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command ['/home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build/build/test_python_554276æ/tempcwd/env/bin/python', '-X', 'dev', '-m', 'pip', 'install', '--no-build-isolation', '/home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build/build/test_python_554276æ/tempcwd/pkg', '-v'] returned non-zero exit status 1.

bedevere-bot · 2026-09-02T18:32:04Z

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot ARM64 MacOS M1 NoGIL 3.x (tier-2) has failed when building commit db92901.

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/1270/builds/8482) and take a look at the build logs.
Check if the failure is related to this commit (db92901) 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/1270/builds/8482

Failed tests:

test_cppext

Failed subtests:

test_build - test.test_cppext.TestInteralCAPI.test_build

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

==

Click to see traceback logs

Traceback (most recent call last):
  File "/Users/buildbot/buildarea/3.x.itamaro-macos-arm64-aws.macos-with-brew.nogil/build/Lib/test/test_cppext/__init__.py", line 146, in test_build
    self.check_build('_testcppext_internal', **kwargs)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/buildarea/3.x.itamaro-macos-arm64-aws.macos-with-brew.nogil/build/Lib/test/test_cppext/__init__.py", line 37, in check_build
    self._check_build(extension_name, python_exe,
    ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                      std=std, limited=limited,
                      ^^^^^^^^^^^^^^^^^^^^^^^^^
                      extra_cflags=extra_cflags)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/buildarea/3.x.itamaro-macos-arm64-aws.macos-with-brew.nogil/build/Lib/test/test_cppext/__init__.py", line 82, in _check_build
    run_cmd('Install', cmd)
    ~~~~~~~^^^^^^^^^^^^^^^^
  File "/Users/buildbot/buildarea/3.x.itamaro-macos-arm64-aws.macos-with-brew.nogil/build/Lib/test/test_cppext/__init__.py", line 63, in run_cmd
    subprocess.run(cmd, check=True, env=env)
    ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/buildarea/3.x.itamaro-macos-arm64-aws.macos-with-brew.nogil/build/Lib/subprocess.py", line 692, in run
    raise CalledProcessError(retcode, process.args,
                             output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command ['/Users/buildbot/buildarea/3.x.itamaro-macos-arm64-aws.macos-with-brew.nogil/build/build/test_python_39839æ/tempcwd/env/bin/python.exe', '-X', 'dev', '-m', 'pip', 'install', '--no-build-isolation', '/Users/buildbot/buildarea/3.x.itamaro-macos-arm64-aws.macos-with-brew.nogil/build/build/test_python_39839æ/tempcwd/pkg', '-v'] returned non-zero exit status 1.


Traceback (most recent call last):
  File "/Users/buildbot/buildarea/3.x.itamaro-macos-arm64-aws.macos-with-brew.nogil/build/Lib/test/test_cppext/__init__.py", line 146, in test_build
    self.check_build('_testcppext_internal', **kwargs)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/buildarea/3.x.itamaro-macos-arm64-aws.macos-with-brew.nogil/build/Lib/test/test_cppext/__init__.py", line 37, in check_build
    self._check_build(extension_name, python_exe,
    ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                      std=std, limited=limited,
                      ^^^^^^^^^^^^^^^^^^^^^^^^^
                      extra_cflags=extra_cflags)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/buildarea/3.x.itamaro-macos-arm64-aws.macos-with-brew.nogil/build/Lib/test/test_cppext/__init__.py", line 82, in _check_build
    run_cmd('Install', cmd)
    ~~~~~~~^^^^^^^^^^^^^^^^
  File "/Users/buildbot/buildarea/3.x.itamaro-macos-arm64-aws.macos-with-brew.nogil/build/Lib/test/test_cppext/__init__.py", line 63, in run_cmd
    subprocess.run(cmd, check=True, env=env)
    ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/buildarea/3.x.itamaro-macos-arm64-aws.macos-with-brew.nogil/build/Lib/subprocess.py", line 692, in run
    raise CalledProcessError(retcode, process.args,
                             output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command ['/Users/buildbot/buildarea/3.x.itamaro-macos-arm64-aws.macos-with-brew.nogil/build/build/test_python_49042æ/tempcwd/env/bin/python.exe', '-X', 'dev', '-m', 'pip', 'install', '--no-build-isolation', '/Users/buildbot/buildarea/3.x.itamaro-macos-arm64-aws.macos-with-brew.nogil/build/build/test_python_49042æ/tempcwd/pkg', '-v'] returned non-zero exit status 1.

bedevere-bot · 2026-09-02T18:32:48Z

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Alpine Linux NoGIL 3.x (tierless) has failed when building commit db92901.

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/1819/builds/2983) and take a look at the build logs.
Check if the failure is related to this commit (db92901) 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/1819/builds/2983

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

==

Click to see traceback logs

Traceback (most recent call last):
  File �[35m"/buildbot/buildarea/3.x.ware-alpine.nogil/build/Lib/test/test_cppext/__init__.py"�[0m, line �[35m146�[0m, in �[35mtest_build�[0m
    �[31mself.check_build�[0m�[1;31m('_testcppext_internal', **kwargs)�[0m
    �[31m~~~~~~~~~~~~~~~~�[0m�[1;31m^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^�[0m
  File �[35m"/buildbot/buildarea/3.x.ware-alpine.nogil/build/Lib/test/test_cppext/__init__.py"�[0m, line �[35m37�[0m, in �[35mcheck_build�[0m
    �[31mself._check_build�[0m�[1;31m(extension_name, python_exe,�[0m
    �[31m~~~~~~~~~~~~~~~~~�[0m�[1;31m^^^^^^^^^^^^^^^^^^^^^^^^^^^^�[0m
                      �[1;31mstd=std, limited=limited,�[0m
                      �[1;31m^^^^^^^^^^^^^^^^^^^^^^^^^�[0m
                      �[1;31mextra_cflags=extra_cflags)�[0m
                      �[1;31m^^^^^^^^^^^^^^^^^^^^^^^^^^�[0m
  File �[35m"/buildbot/buildarea/3.x.ware-alpine.nogil/build/Lib/test/test_cppext/__init__.py"�[0m, line �[35m82�[0m, in �[35m_check_build�[0m
    �[31mrun_cmd�[0m�[1;31m('Install', cmd)�[0m
    �[31m~~~~~~~�[0m�[1;31m^^^^^^^^^^^^^^^^�[0m
  File �[35m"/buildbot/buildarea/3.x.ware-alpine.nogil/build/Lib/test/test_cppext/__init__.py"�[0m, line �[35m63�[0m, in �[35mrun_cmd�[0m
    �[31msubprocess.run�[0m�[1;31m(cmd, check=True, env=env)�[0m
    �[31m~~~~~~~~~~~~~~�[0m�[1;31m^^^^^^^^^^^^^^^^^^^^^^^^^^�[0m
  File �[35m"/buildbot/buildarea/3.x.ware-alpine.nogil/build/Lib/subprocess.py"�[0m, line �[35m692�[0m, in �[35mrun�[0m
    raise CalledProcessError(retcode, process.args,
                             output=stdout, stderr=stderr)
�[1;35msubprocess.CalledProcessError�[0m: �[35mCommand ['/buildbot/buildarea/3.x.ware-alpine.nogil/build/build/test_python_3353076æ/tempcwd/env/bin/python', '-X', 'dev', '-m', 'pip', 'install', '--no-build-isolation', '/buildbot/buildarea/3.x.ware-alpine.nogil/build/build/test_python_3353076æ/tempcwd/pkg', '-v'] returned non-zero exit status 1.�[0m


Traceback (most recent call last):
  File �[35m"/buildbot/buildarea/3.x.ware-alpine.nogil/build/Lib/test/test_cppext/__init__.py"�[0m, line �[35m146�[0m, in �[35mtest_build�[0m
    �[31mself.check_build�[0m�[1;31m('_testcppext_internal', **kwargs)�[0m
    �[31m~~~~~~~~~~~~~~~~�[0m�[1;31m^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^�[0m
  File �[35m"/buildbot/buildarea/3.x.ware-alpine.nogil/build/Lib/test/test_cppext/__init__.py"�[0m, line �[35m37�[0m, in �[35mcheck_build�[0m
    �[31mself._check_build�[0m�[1;31m(extension_name, python_exe,�[0m
    �[31m~~~~~~~~~~~~~~~~~�[0m�[1;31m^^^^^^^^^^^^^^^^^^^^^^^^^^^^�[0m
                      �[1;31mstd=std, limited=limited,�[0m
                      �[1;31m^^^^^^^^^^^^^^^^^^^^^^^^^�[0m
                      �[1;31mextra_cflags=extra_cflags)�[0m
                      �[1;31m^^^^^^^^^^^^^^^^^^^^^^^^^^�[0m
  File �[35m"/buildbot/buildarea/3.x.ware-alpine.nogil/build/Lib/test/test_cppext/__init__.py"�[0m, line �[35m82�[0m, in �[35m_check_build�[0m
    �[31mrun_cmd�[0m�[1;31m('Install', cmd)�[0m
    �[31m~~~~~~~�[0m�[1;31m^^^^^^^^^^^^^^^^�[0m
  File �[35m"/buildbot/buildarea/3.x.ware-alpine.nogil/build/Lib/test/test_cppext/__init__.py"�[0m, line �[35m63�[0m, in �[35mrun_cmd�[0m
    �[31msubprocess.run�[0m�[1;31m(cmd, check=True, env=env)�[0m
    �[31m~~~~~~~~~~~~~~�[0m�[1;31m^^^^^^^^^^^^^^^^^^^^^^^^^^�[0m
  File �[35m"/buildbot/buildarea/3.x.ware-alpine.nogil/build/Lib/subprocess.py"�[0m, line �[35m692�[0m, in �[35mrun�[0m
    raise CalledProcessError(retcode, process.args,
                             output=stdout, stderr=stderr)
�[1;35msubprocess.CalledProcessError�[0m: �[35mCommand ['/buildbot/buildarea/3.x.ware-alpine.nogil/build/build/test_python_3389655æ/tempcwd/env/bin/python', '-X', 'dev', '-m', 'pip', 'install', '--no-build-isolation', '/buildbot/buildarea/3.x.ware-alpine.nogil/build/build/test_python_3389655æ/tempcwd/pkg', '-v'] returned non-zero exit status 1.�[0m

encukou · 2026-09-03T11:13:31Z

This fails on some buildbots with:

  /usr/bin/g++ -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -fno-strict-overflow -Wsign-compare -g -Og -Wall -fPIC -I/home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build/build/test_python_2302880æ/tempcwd/env/include -I/home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build/Include -I/home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build -c extension.cpp -o build/temp.linux-x86_64-cpython-316t-pydebug/extension.o -Werror -DMODULE_NAME=_testcppext_internal -DTEST_INTERNAL_C_API=1
  In file included from /home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build/Include/internal/pycore_object.h:13,
                   from /home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build/Include/internal/pycore_cell.h:5,
                   from extension.cpp:29:
  /home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build/Include/internal/pycore_interpframe.h: In function ‘PyFrameObject* _PyFrame_GetFrameObject(_PyInterpreterFrame*)’:
  /home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build/Include/internal/pycore_pyatomic_ft_wrappers.h:33:32: error: invalid conversion from ‘void*’ to ‘PyFrameObject*’ {aka ‘_frame*’} [-fpermissive]
     33 |     _Py_atomic_load_ptr_acquire(&value)
        |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
        |                                |
        |                                void*
  /home/buildbot/buildarea/3.x.itamaro-centos-aws.nogil/build/Include/internal/pycore_interpframe.h:348:26: note: in expansion of macro ‘FT_ATOMIC_LOAD_PTR_ACQUIRE’
    348 |     PyFrameObject *res = FT_ATOMIC_LOAD_PTR_ACQUIRE(frame->frame_obj);
        |                          ^~~~~~~~~~~~~~~~~~~~~~~~~~

pythongh-144446: Fix thread safety of gi_frame, cr_frame and ag_frame…

4b614d3

… in free-threading build

bedevere-app Bot mentioned this pull request Aug 19, 2026

Data races with frame objects #144446

Open

3 tasks

Merge branch 'main' into gen-gi-frame-thread-safety

d61c635

kumaraditya303 commented Aug 19, 2026

View reviewed changes

Comment thread Misc/NEWS.d/next/Core_and_Builtins/2026-08-19-06-43-54.gh-issue-144446.k3QzXa.rst Outdated

Update Misc/NEWS.d/next/Core_and_Builtins/2026-08-19-06-43-54.gh-issu…

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…e-144446.k3QzXa.rst

kumaraditya303 marked this pull request as ready for review August 20, 2026 13:04

kumaraditya303 requested a review from markshannon as a code owner August 20, 2026 13:04

bedevere-app Bot added the awaiting core review label Aug 20, 2026

kumaraditya303 requested a review from mpage August 20, 2026 13:05

kumaraditya303 added the topic-free-threading label Aug 20, 2026

kumaraditya303 added 2 commits September 2, 2026 18:59

use relaxed atomics for frame_obj instead of compare exchange

559852e

Merge branch 'main' into gen-gi-frame-thread-safety

b56d4af

mpage approved these changes Sep 2, 2026

View reviewed changes

bedevere-app Bot added awaiting merge and removed awaiting core review labels Sep 2, 2026

kumaraditya303 merged commit db92901 into python:main Sep 2, 2026
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bedevere-app Bot removed the awaiting merge label Sep 2, 2026

kumaraditya303 deleted the gen-gi-frame-thread-safety branch September 2, 2026 17:56

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gh-144446: Fix thread safety of gi_frame, cr_frame and ag_frame in free-threading - #156037

gh-144446: Fix thread safety of gi_frame, cr_frame and ag_frame in free-threading#156037
kumaraditya303 merged 5 commits into
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kumaraditya303:gen-gi-frame-thread-safety

kumaraditya303 commented Aug 19, 2026 •

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kumaraditya303 commented Aug 19, 2026 •

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