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nix: revert default to 2.18 for now#343032

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K900 merged 3 commits intoNixOS:masterfrom
K900:revert-nix-2-24
Sep 19, 2024
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nix: revert default to 2.18 for now#343032
K900 merged 3 commits intoNixOS:masterfrom
K900:revert-nix-2-24

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@K900 K900 commented Sep 19, 2024 •
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Description of changes

The segfault bug (see #335342) keeps hitting Hydra on unstable-small, so it's likely going to hit a lot of people once it rolls out widely. Let's revert for now, and investigate without time pressure.

Things done

  • Built on platform(s)
    • x86_64-linux
    • aarch64-linux
    • x86_64-darwin
    • aarch64-darwin
  • For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
    • sandbox = relaxed
    • sandbox = true
  • Tested, as applicable:
  • Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
  • Tested basic functionality of all binary files (usually in ./result/bin/)
  • 24.11 Release Notes (or backporting 23.11 and 24.05 Release notes)
    • (Package updates) Added a release notes entry if the change is major or breaking
    • (Module updates) Added a release notes entry if the change is significant
    • (Module addition) Added a release notes entry if adding a new NixOS module
  • Fits CONTRIBUTING.md.

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@K900 K900 requested review from a team and RaitoBezarius as code owners September 19, 2024 13:48
@github-actions github-actions bot added 6.topic: nixos Issues or PRs affecting NixOS modules, or package usability issues specific to NixOS 8.has: module (update) This PR changes an existing module in `nixos/` labels Sep 19, 2024
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K900 commented Sep 19, 2024

Running nixpkgs-review to see if there's anything else that needs reverting.

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emilazy commented Sep 19, 2024

Seems like the simpleUefiSystemdBoot test is another thing that should go in the Nix passthru pile (though given that it’s flaky it might not help that much).

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Mic92 commented Sep 19, 2024 •
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Seems like the simpleUefiSystemdBoot test is another thing that should go in the Nix passthru pile (though given that it’s flaky it might not help that much).

I am not so sure about that. It could be any nixos configuration causing this really.

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K900 commented Sep 19, 2024

Yeah, maybe if someone finds an expression that reproduces this consistently, we can add it to the upstream test suite, but this feels way too flaky.

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alyssais commented Sep 19, 2024

Please include reasons for reverts in commit messages.

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K900 commented Sep 19, 2024

Updated commit messages, added nix-plugins revert.

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emilazy commented Sep 19, 2024 •
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6c0fc2b45e0e3ed4bcaebe22b0b7ecb7e8303da8 isn’t right. (Or rather it’s insufficient.)

Edit: Never mind; it’s in the next commit.

Mic92
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I think the nix maintainer team should have consulted for that. Also there is no nix issue for this bug.

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K900 commented Sep 19, 2024

Result of nixpkgs-review pr 343032 run on x86_64-linux 1

1 package blacklisted:
  • nixos-install-tools
94 packages built:
  • appvm
  • attic-client
  • attic-server
  • bundix
  • cabal2nix
  • cached-nix-shell
  • common-updater-scripts
  • crate2nix
  • crystal2nix
  • disko
  • dub-to-nix
  • dydisnix
  • fusionInventory
  • libnixxml
  • lua51Packages.luarocks-nix
  • lua52Packages.luarocks-nix
  • lua53Packages.luarocks-nix
  • lua54Packages.luarocks-nix
  • luajitPackages.luarocks-nix
  • luarocks-packages-updater
  • nim_lk
  • niv (niv.bin ,niv.data)
  • nix
  • nix-binary-cache
  • nix-bundle
  • nix-direnv
  • nix-du
  • nix-index
  • nix-init
  • nix-pin
  • nix-plugin-pijul
  • nix-plugins
  • nix-prefetch
  • nix-prefetch-bzr
  • nix-prefetch-cvs
  • nix-prefetch-docker
  • nix-prefetch-git
  • nix-prefetch-hg
  • nix-prefetch-scripts
  • nix-prefetch-svn
  • nix-required-mounts
  • nix-required-mounts.dist
  • nix-template
  • nix-update
  • nix-update-source
  • nix-update-source.dist
  • nix-update.dist
  • nix-visualize
  • nix-visualize.dist
  • nix.debug
  • nix.dev
  • nix.doc
  • nix.man
  • nixStatic
  • nixStatic.dev
  • nixStatic.doc
  • nixStatic.man
  • nixci
  • nixos-anywhere
  • nixos-generators
  • nixos-rebuild
  • nixos-shell
  • nixpkgs-hammering
  • nixpkgs-manual
  • nixpkgs-review
  • nixpkgs-review.dist
  • nixtract
  • node2nix
  • npins
  • nuget-to-nix
  • nurl
  • nvfetcher
  • outline
  • prefetch-yarn-deps
  • python311Packages.nix-kernel
  • python311Packages.nix-kernel.dist
  • python312Packages.nix-kernel
  • python312Packages.nix-kernel.dist
  • sbomnix
  • sbomnix.dist
  • sonarr
  • swiftPackages.swiftpm2nix
  • terranix
  • typescript-language-server
  • update-nix-fetchgit
  • update-python-libraries
  • vimPluginsUpdater
  • vulnix
  • vulnix.dist
  • vulnix.doc
  • vulnix.man
  • wp4nix
  • yarn2nix
  • zon2nix

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emilazy commented Sep 19, 2024

I think we arrived at the consensus to merge the bump as long as we’re willing to revert if problems crop up again, given the reaction to #335342 (review) and discussion with @fabianhjr on Matrix when they were making the decision to merge. If there are channel‐blocking eval crash issues cropping up even on the small channel I don’t think we should let a delay risk this shipping to the channels before further assessment.

@alyssais alyssais added the 12.approvals: 2 This PR was reviewed and approved by two persons. label Sep 19, 2024
@K900 K900 mentioned this pull request Sep 19, 2024
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K900 commented Sep 19, 2024

Filed a proper bug to contain discussion: NixOS/nix#11547

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patka-123 commented Sep 19, 2024

I think the nix maintainer team should have consulted for that. Also there is no nix issue for this bug.

First and foremost we shouldn't break users systems, then do the proper communication and triaging. Reverting seems the most important to me for now, no?

K900 added 3 commits September 19, 2024 17:17
@K900
Revert "nixos/nix-fallback-paths: 2.24.2 -> 2.24.6"
fb38235 
This reverts commit ac849e5.

Nix 2.24 segfaults semi-randomly during evaluation on specific configs (?).
This commit prepares for another revert, putting the default back to 2.18.

Upstream issue: NixOS/nix#11547
@K900
Revert "nix: nix_2_18 -> nix_2_24"
b3b9bdd 
This reverts commit 2e702d0.

Segfaults during evaluation in yet-to-be-determined circumstances.
Investigation is ongoing, reverting for now to be safe.

Upstream issue: NixOS/nix#11547
@K900
Revert "nix-plugins: 14.0.0 -> 15.0.0"
7d10007 
This reverts commit 0291167.

To match Nix version revert.

See upstream issue: NixOS/nix#11547
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K900 commented Sep 19, 2024

One last force push to add upstream issue reference to all commits.

@K900 K900 merged commit c04d565 into NixOS:master Sep 19, 2024
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@K900 K900 deleted the revert-nix-2-24 branch July 27, 2025 10:46
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@RaitoBezarius RaitoBezarius RaitoBezarius approved these changes

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6.topic: nixos Issues or PRs affecting NixOS modules, or package usability issues specific to NixOS 8.has: module (update) This PR changes an existing module in `nixos/` 12.approvals: 2 This PR was reviewed and approved by two persons.

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