glibc: 2.40-66 -> 2.42-47 by Ma27 · Pull Request #379542 · NixOS/nixpkgs

Ma27 · 2025-02-05T08:58:00Z

Announcement: https://lists.gnu.org/archive/html/info-gnu/2025-01/msg00014.html

Build-wise it's looking relatively good and I got quite far.
However, I'm a little worried about

dlopen and dlmopen no longer make the stack executable if a shared
library requires it, either implicitly because of a missing GNU_STACK
ELF header (and default ABI permission having the executable bit set)
or explicitly because of the executable bit in GNU_STACK, and the
stack is not already executable. Instead, loading such objects will
fail.

Let's see how many regressions Hydra can find regarding that. But I'll need to look for more bugreports on that matter for potential fallout.

TODO:

Another Hydra-run with staging (there's surprisingly much stuff depending on e.g. openjdk that's fixed in upstream/staging or asyncio (that was flaky, but cannot restart only "dependency failed" builds depending on this AFAIK))
Test a full NixOS system
Add documentation for how to work around dlopen() problem in e.g. release notes
Await staging being free for 26.05

Things done

Add a 👍 reaction to pull requests you find important.

vcunat · 2025-02-05T10:03:30Z

Jobset: https://hydra.nixos.org/jobset/nixpkgs/glibc-2.41

Linux stdenvs for now, afterwards I expect all of x86_64-linux. Given the previous experience, I assume that you chose a commit base that's known to be not too broken.

vcunat · 2025-02-14T09:32:07Z

A thread of interest: https://sourceware.org/bugzilla/show_bug.cgi?id=32653

fabianhjr

https://www.gamingonlinux.com/2025/02/the-glibc-2-41-update-has-been-causing-problems-for-linux-gaming/

Should probably skip this release, there is likely to be a more backwards compatible release in the near future.

trofi · 2025-02-23T20:03:23Z

dtc will need a fix for it's test suite: dgibson/dtc@ce1d858. Proposed it's inclusion against staging as:

dtc: fix the test against glibc-2.41 #390474

trofi · 2025-03-16T22:19:41Z

webkitgtk also fails the build against glibc-2.41. That is fixed by a gobject-introspection backport:

gobject-introspection: pull upstream fix for glibc-2.41 on clang #390512

trofi · 2025-07-20T08:58:43Z

Will need a 2a9a83e revert:

$ nix build --no-link github:NixOS/nixpkgs/pull/379542/merge#glibc -L
...
glibc> substituteStream() in derivation glibc-2.41-63: ERROR: pattern ATTRIBUTE_REPRODUCIBLE doesn't match anything in file 'timezone/zic.c'

Ma27 · 2025-07-20T10:03:09Z

It was precisely the intention to not forget about this here by having a build failure when rebasing again.

vcunat · 2025-09-26T05:54:04Z

Planning to catch 25.11? If so, there are ~~two weeks~~ left for merging this PR, according to the schedule: #443568

vcunat · 2025-09-26T05:58:58Z

One week, only about one week left.

Ma27 · 2025-09-26T09:25:43Z

So, after fixing GCC there's quite a lot of stuff building again. I'll need to take a look at how to deal with the exec-stack problem this weekend, then I can make a suggestion.

Failing Hydra build: https://hydra.nixos.org/build/308304933 ChangeLog: https://chuck.stanford.edu/release/VERSIONS

Failing Hydra build: https://hydra.nixos.org/build/308374102 Considering how old this package seems to be according to the changelog[1], I'm not going to bother with patching it. [1] https://metadata.ftp-master.debian.org/changelogs//main/x/xxgdb/xxgdb_1.12-17_changelog

Failing Hydra build: https://hydra.nixos.org/build/308340445

Failing Hydra build: https://hydra.nixos.org/build/308527220

To fix build with glibc-2.42. Failing Hydra build: https://hydra.nixos.org/build/308474067

Failing Hydra build: https://hydra.nixos.org/build/308467284

Failing Hydra build: https://hydra.nixos.org/build/308527236 Compat is being worked on, but the patch for glibc 2.42 seems to crash at runtime.

Failing Hydra build: https://hydra.nixos.org/build/308526977 I'm not sure what exactly caused the failure here, but this patch from LLVM upstream seems to fix the problem and this regressed right after the glibc upgrade.

Failing Hydra build: https://hydra.nixos.org/build/308650242 The libraries require an execstack even though it's not necessary. This got fixed upstream already[1], but this doesn't apply cleanly on the version we have. [1] microsoft/onnxruntime#25200

Doesn't build with glibc-2.42 anymore, didn't see a release in 10 years. Failing Hydra build: https://hydra.nixos.org/build/308670849

Failing Hydra build: https://hydra.nixos.org/build/317772107

Failing Hydra build: https://hydra.nixos.org/build/317799900 This turns of a warning about a potential format overflow, but I consider it sufficiently unlikely to have enough threads[1] such that this actually causes an overflow. [1] https://git.kernel.org/pub/scm/utils/rt-tests/rt-tests.git/tree/src/pmqtest/pmqtest.c#n546

Failing Hydra build: https://hydra.nixos.org/build/317760066

Ma27 · 2026-01-03T19:40:03Z

OK, so I managed to rebuild my laptop's configuration on this branch and can boot into a system built with glibc 2.42.

I'd say we're good to go now. The Hydra jobset is looking quite good (and most jobs are fallout of uvloop's flaky tests anyways). There's even documentation about the execstack topic now. I'm considering to add a dedicated glibc-shenanigans section to the nixpkgs manual which will also include the execstack part, but I think we're good with the release-notes section I added.

Reviews would be very welcome.
cc @trofi @vcunat @mweinelt @K900

vcunat · 2026-01-03T20:24:14Z

It sounds good to me. Also, the executable stack thing is almost one year released upstream, so that's quite some time for other SW to adapt (at least from Nixpkgs perspective of short release cycles).

vcunat · 2026-01-03T20:26:10Z

Also, more fixes could be done during staging-next, as usual. And people with issues could often consider switching to 25.11 for the time being, as -unstable hasn't diverged that much.

fabianhjr

Only regarding glibc changes (didn't review package fixes/removals)

Would prefer removals not to be included in this PR but wouldn't oppose for this to be merged as is either and any issues being addressed during staging/staging-next cycles.

Ma27 · 2026-01-03T21:48:11Z

The packages removed in here are an intersection of

either dead or shouldn't be in nixpkgs for other reasons (see the commit messages for the hyper* stuff I removed, that should've never been merged in the first place!)
breaks with the new glibc

Everything else is either fixed or marked as broken (or missed while checking Hydra).

Ma27 force-pushed the bump-glibc branch from 2672e4e to 9c8d2d1 Compare February 5, 2025 09:11

fabianhjr reviewed Feb 19, 2025

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Ma27 force-pushed the bump-glibc branch from 9c8d2d1 to ccedf06 Compare July 9, 2025 05:16

Ma27 changed the title ~~glibc: 2.40-66 -> 2.41-4~~ glibc: 2.40-66 -> 2.41-63 Jul 9, 2025

nixpkgs-ci bot added the 10.rebuild-linux-stdenv This PR causes stdenv to rebuild on Linux and must target a staging branch. label Jul 9, 2025

nixpkgs-ci bot added the 2.status: merge conflict This PR has merge conflicts with the target branch label Jul 26, 2025

Ma27 mentioned this pull request Aug 14, 2025

Update Request: glibc 2.40-66 -> 2.42 #431745

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Ma27 force-pushed the bump-glibc branch from ccedf06 to a4e9f9a Compare September 25, 2025 22:17

vcunat changed the title ~~glibc: 2.40-66 -> 2.41-63~~ glibc: 2.40-x -> 2.42-y Sep 26, 2025

This was referenced Sep 26, 2025

autobase: init at 7.7.0 #403638

Merged

jdk: 11.0.28+6 -> 11.0.29+5, 17.0.16+8 -> 17.0.17+8, 21.0.8+9 -> 21.0.9+8 #446399

Merged

Ma27 force-pushed the bump-glibc branch from e97d217 to d843ce4 Compare September 26, 2025 17:01

nixpkgs-ci bot added 6.topic: java Including JDK, tooling, other languages, other VMs 6.topic: llvm/clang Issues related to llvmPackages, clangStdenv and related labels Sep 26, 2025

Ma27 added 14 commits January 3, 2026 20:39

chuck: 1.4.2.0 -> 1.5.5.5, fix build w/ glibc-2.42

96a5f20

Failing Hydra build: https://hydra.nixos.org/build/308304933 ChangeLog: https://chuck.stanford.edu/release/VERSIONS

xxgdb: remove

5d1a18d

Failing Hydra build: https://hydra.nixos.org/build/308374102 Considering how old this package seems to be according to the changelog[1], I'm not going to bother with patching it. [1] https://metadata.ftp-master.debian.org/changelogs//main/x/xxgdb/xxgdb_1.12-17_changelog

powwow: remove

51d565a

Failing Hydra build: https://hydra.nixos.org/build/308340445

rr: fix build w/ glibc-2.42

f9cc409

Failing Hydra build: https://hydra.nixos.org/build/308527220

gccNGPackages_15: 15.1.0 -> 15.2.0, fix build w/ glibc-2.42

823f64e

To fix build with glibc-2.42. Failing Hydra build: https://hydra.nixos.org/build/308474067

ananicy-cpp: fix build w/ glibc-2.42

84a953f

Failing Hydra build: https://hydra.nixos.org/build/308467284

rshim-user-space: mark as broken

094ddc3

Failing Hydra build: https://hydra.nixos.org/build/308527236 Compat is being worked on, but the patch for glibc 2.42 seems to crash at runtime.

rocmPackages.llvm.llvm: fix build w/ glibc-2.42

32ca2e4

Failing Hydra build: https://hydra.nixos.org/build/308526977 I'm not sure what exactly caused the failure here, but this patch from LLVM upstream seems to fix the problem and this regressed right after the glibc upgrade.

mrpeach: remove

2dd6b7f

Doesn't build with glibc-2.42 anymore, didn't see a release in 10 years. Failing Hydra build: https://hydra.nixos.org/build/308670849

nixos/doc/release-notes: document glibc execstack change

3604e3a

openvi: fix build w/ glibc-2.42

8f0cddc

Failing Hydra build: https://hydra.nixos.org/build/317772107

jdk11: 11.0.29+7 -> 11.0.31+0, fix build w/ glibc-2.42

2fb7889

Failing Hydra build: https://hydra.nixos.org/build/317760066

Ma27 force-pushed the bump-glibc branch from bc222c6 to 2fb7889 Compare January 3, 2026 19:39

fabianhjr approved these changes Jan 3, 2026

View reviewed changes

nixpkgs-ci bot added the 12.approvals: 1 This PR was reviewed and approved by one person. label Jan 3, 2026

Ma27 changed the title ~~glibc: 2.40-x -> 2.42-y~~ glibc: 2.40-66 -> 2.42-47 Jan 6, 2026

leona-ya approved these changes Jan 6, 2026

View reviewed changes

nixpkgs-ci bot added 12.approvals: 2 This PR was reviewed and approved by two persons. and removed 12.approvals: 1 This PR was reviewed and approved by one person. labels Jan 6, 2026

vcunat added this pull request to the merge queue Jan 6, 2026

Merged via the queue into NixOS:staging with commit 9ab74f3 Jan 6, 2026
33 checks passed

Ma27 deleted the bump-glibc branch January 6, 2026 18:20

petm5 mentioned this pull request Feb 18, 2026

Activation failed with the latest nixos-unstable nix-community/nix-on-droid#495

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