util-linux: fix mount regression

[DerRockWolf]

Add patch of util-linux/util-linux@7dbfe31

This fixes the issues mentioned here:

• Possible mount regression with 2.41 when using Kubernetes util-linux/util-linux#3474
• Pods cannot mount local-path PVC with util-linux 2.41 with supported k3s k3s-io/k3s#12006

Note: For k3s it should be possible to work around the issue by running k3s with --prefer-bundled-bin. But I was unable to get it working with nixpkgs revision dda3dcd.
Edit: actually quite obvious why --prefer-bundled-bin does not work. The k3s nix package does not copy over the auxiliary binaries from https://github.com/k3s-io/k3s-root/releases/download/v0.14.1/k3s-root-amd64.tar to the location where the build expects them.

CC: @numinit @NixOS/k3s

Things done

I did not yet have enough time to rebuild every package depending on util-linux.

• 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:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• 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/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 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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[mweinelt]

Too many builds for master. Rebase onto and retarget for staging instead.

[numinit]

This PR should probably be against staging (given the rebuild count) so we pick it up in the next cycle.

(e: posted at the same time as the above)

[DerRockWolf]

Too many builds for master. Rebase onto and retarget for staging instead.

Done (hopefully everything is now correct^^)

[numinit]

util-linuxMinimal builds just fine. util-linux is going now, but I assume it'll be fine too.

Edit: indeed it was.

[numinit]

@alyssais Should this be OK to merge to staging? Just want to make sure it won't affect anything for release given the number of builds.

[ar3s3ru]

Just ran into this issue while updating my servers. Is there a workaround while waiting for this PR to be merged?

Thanks!

[DerRockWolf]

Just ran into this issue while updating my servers. Is there a workaround while waiting for this PR to be merged?

Thanks!

The only way would be to apply the patch yourself. The --prefer-bundled-bin flag does not work, see #406570

[ar3s3ru]

The only way would be to apply the patch yourself.

Is there a way to do that on current nixos-unstable without pinning the PR latest commit?

[DerRockWolf]

The only way would be to apply the patch yourself.

Is there a way to do that on current nixos-unstable without pinning the PR latest commit?

You would either need to create an overlay or fork nixpkgs and cherry-pick this commit to nixos-unstable. Keep in mind that you must rebuild a bunch of packages when changing util-linux.

[numinit]

In case anyone was wondering why this is in limbo: this was reported mid-25.05 stabilization staging cycle and would require a mass rebuild of everything, so we'll get it into the cycle after release.

If this issue affects you, give k3s.override { util-linux = util-linuxMinimal.overrideAttrs (prev: { patches = prev.patches or [] ++ [./fix-mount-regression.patch]; }); } a shot. Note that util-linuxMinimal is much faster to compile than util-linux because util-linux transitively depends on util-linuxMinimal.

If this ends up working for people, we can PR it to k3s instead as a short term fix, which will not cause a mass rebuild. Please let me know if you try it!

Edit: #407810

[ar3s3ru]

If this ends up working for people, we can PR it to k3s instead as a short term fix, which will not cause a mass rebuild. Please let me know if you try it!

Worked perfectly for me, and recompilation was really quick. Thanks for the fix!

[herobrauni]

In case anyone was wondering why this is in limbo: this was reported mid-25.05 stabilization staging cycle and would require a mass rebuild of everything, so we'll get it into the cycle after release.

If this issue affects you, give k3s.override { util-linux = util-linuxMinimal.overrideAttrs (prev: { patches = prev.patches or [] ++ [./fix-mount-regression.patch]; }); } a shot. Note that util-linuxMinimal is much faster to compile than util-linux because util-linux transitively depends on util-linuxMinimal.

If this ends up working for people, we can PR it to k3s instead as a short term fix, which will not cause a mass rebuild. Please let me know if you try it!

Can confirm this fixed it for me.

[numinit]

Excellent!

[nixos-discourse]

This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/solved-downgrade-dependency-to-util-linux-in-a-remote-flake/65132/6