[Bug 2148904] [NEW] sort provides unpredictable output

[Aurelijus Rinkevicius]

Public bug reported:

With Ubuntu 26.04 and sort v. 0.8.0 unpredictable behavior is seen. To illustrate the point, I attach two "sorted" files "sort1" and "sort2", and one more file "sort-old" using an older version 0.2.0 (from Ubuntu 25.10).
Note:
* With a new sort lines 14&15 are randomly swapped and stay like that.
    - You can run sort on the files (sort1 and sort2) and it will just stay invariant as they are already sorted.
* New sort has different sorting preferences, which would be somewhat OK if a consistent behavior would be the case.

ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: coreutils-from-uutils 0.0.0~ubuntu25
ProcVersionSignature: Ubuntu 7.0.0-14.14-generic 7.0.0
Uname: Linux 7.0.0-14-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Mon Apr 20 17:38:47 2026
InstallationDate: Installed on 2020-03-15 (2227 days ago)
InstallationMedia: Kubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
PackageArchitecture: all
SourcePackage: coreutils-from
UpgradeStatus: Upgraded to resolute on 2026-04-17 (3 days ago)

** Affects: coreutils-from (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug resolute wayland-session

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https://bugs.launchpad.net/bugs/2148904

Title:
  sort provides unpredictable output

Status in coreutils-from package in Ubuntu:
  New

Bug description:
  With Ubuntu 26.04 and sort v. 0.8.0 unpredictable behavior is seen. To illustrate the point, I attach two "sorted" files "sort1" and "sort2", and one more file "sort-old" using an older version 0.2.0 (from Ubuntu 25.10).
  Note:
  * With a new sort lines 14&15 are randomly swapped and stay like that.
      - You can run sort on the files (sort1 and sort2) and it will just stay invariant as they are already sorted.
  * New sort has different sorting preferences, which would be somewhat OK if a consistent behavior would be the case.

  ProblemType: Bug
  DistroRelease: Ubuntu 26.04
  Package: coreutils-from-uutils 0.0.0~ubuntu25
  ProcVersionSignature: Ubuntu 7.0.0-14.14-generic 7.0.0
  Uname: Linux 7.0.0-14-generic x86_64
  ApportVersion: 2.34.0-0ubuntu2
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: KDE
  Date: Mon Apr 20 17:38:47 2026
  InstallationDate: Installed on 2020-03-15 (2227 days ago)
  InstallationMedia: Kubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
  PackageArchitecture: all
  SourcePackage: coreutils-from
  UpgradeStatus: Upgraded to resolute on 2026-04-17 (3 days ago)

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