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GeezerVison is showing github.com — gh-143632: Disable PR_SET_VMA_ANON_NAME on musl libc by priyanshu2282-cyber · Pull Request #143730 · python/cpython

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priyanshu2282-cyber commented Jan 12, 2026

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On Alpine Linux (musl libc), enabling PR_SET_VMA_ANON_NAME can cause build failures due to redefinition of
struct prctl_mm_map.
musl libc redefines this struct in sys/prctl.h, which conflicts with linux/prctl.h. The configure check for PR_SET_VMA_ANON_NAME is not realiable on musl and may pass on
some architectures but fail later during build.
This change disables the feature detection on musl to avoid the header conflict and keep the build behavior consistent.
Note: configure was not regenerated locally since CPython
does not support autoreconf on macOS.

Fixes gh-143632.

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          Disable PR_SET_VMA_ANON_NAME on musl

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priyanshu2282-cyber requested review from AA-Turner, corona10, emmatyping and erlend-aasland as code owners

January 12, 2026 13:54

bedevere-app Bot commented Jan 12, 2026

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

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bedevere-app Bot mentioned this pull request

Jan 12, 2026

failure building Python 3.15.0a3 through 3.15.0 release on Alpine #143632

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Jan 12, 2026

corona10 requested changes

Jan 13, 2026

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Note: configure was not regenerated locally since CPython
does not support autoreconf on macOS.

Would you like to run make regen-configure
It will run based on container.

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bedevere-app Bot added awaiting changes and removed awaiting review labels

Jan 13, 2026

bedevere-app Bot commented Jan 13, 2026

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A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

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corona10 self-assigned this

Jan 13, 2026

priyanshu2282-cyber commented Jan 13, 2026

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Thanks for pointing this out, sure I’m happy to run it.

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priyanshu2282-cyber requested a review from corona10

January 13, 2026 14:08

picnixz commented Jan 13, 2026 •

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The configure script is still not updated. Please do so. And only request reviews when the CI is green again.

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priyanshu2282-cyber commented Jan 13, 2026

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I tried to regenerate configure using a container-based approach, but I couldn’t find a supported workflow or make target for this checkout. It may be easier if configure is regenerated on your side. Please let me know if there are any specific commands you would like me to try.

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          regen configure

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bedevere-app Bot commented Jan 14, 2026

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

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corona10 added the skip news label

Jan 14, 2026

corona10 approved these changes

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corona10 enabled auto-merge (squash)

January 14, 2026 17:33

corona10 merged commit 14f96a8 into python:main

Jan 14, 2026

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bedevere-app Bot removed the awaiting merge label

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thunder-coding pushed a commit to thunder-coding/cpython that referenced this pull request

Feb 15, 2026


          pythongh-143632: Disable PR_SET_VMA_ANON_NAME on musl libc (pythongh-…

1a472c2

…143730)

vstinner commented Apr 8, 2026

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The fix added AS_IF([test "$ac_cv_libc" != musl], [...]) to configure.ac, but $ac_cv_libc is unset (empty string) on Alpine Linux or on Fedora using CC=musl-gcc. I don't see what is supposed to set $ac_cv_libc.

@priyanshu2282-cyber: Did you test your change on Alpine Linux?

It explains this comment on the issue:

The fix was applied to a6, a7, and a8, but it doesn't seem to be working since the failure is still happening.

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vstinner mentioned this pull request

Apr 8, 2026

test_threading.test_recursion_limit() does crash (segfault) on Alpine Linux (musl) #148260

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serhiy-storchaka mentioned this pull request

Oct 20, 2026

configure: the musl guard for PR_SET_VMA_ANON_NAME tests an unset variable #159885

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serhiy-storchaka added a commit to serhiy-storchaka/cpython that referenced this pull request

Oct 20, 2026


          pythongh-143632: Fix the musl check for PR_SET_VMA_ANON_NAME

dd58805

The guard added by pythongh-143730 tested $ac_cv_libc, which is never set, so the
check always ran and the build could fail on the struct prctl_mm_map
redefinition it was meant to avoid.  Match on the host triplet instead.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>

serhiy-storchaka added a commit that referenced this pull request

Oct 20, 2026


          gh-143632: Fix the musl check for PR_SET_VMA_ANON_NAME (GH-159886)

f37e821

The guard added by gh-143730 tested $ac_cv_libc, which is never set, so the
check always ran and the build could fail on the struct prctl_mm_map
redefinition it was meant to avoid.  Match on the host triplet instead.

Co-authored-by: Claude Opus 5 (1M context) <[email protected]>

miss-islington mentioned this pull request

Oct 20, 2026

[3.15] gh-143632: Fix the musl check for PR_SET_VMA_ANON_NAME (GH-159886) #159919

Merged

serhiy-storchaka added a commit that referenced this pull request

Oct 20, 2026


          [3.15] gh-143632: Fix the musl check for PR_SET_VMA_ANON_NAME (GH-159886

eb9ec94

) (GH-159919)

The guard added by gh-143730 tested $ac_cv_libc, which is never set, so the
check always ran and the build could fail on the struct prctl_mm_map
redefinition it was meant to avoid.  Match on the host triplet instead.
(cherry picked from commit f37e821)

Co-authored-by: Serhiy Storchaka <[email protected]>
Co-authored-by: Claude Opus 5 (1M context) <[email protected]>

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failure building Python 3.15.0a3 through 3.15.0 release on Alpine

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