[Bug 2131703] Re: `who` command is broken in both gnu-coreutils and rust-coreutils

[Nick Rosbrook]

We addressed this in GNU coreutils early in the 25.10 cycle, and
backported a fix to 25.04:
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/2103489

However, it does appear that GNU coreutils in 25.10 and 26.04 (devel)
has regressed.

** Tags added: rls-qq-incoming rls-rr-incoming

** Changed in: coreutils (Ubuntu)
       Status: New => Confirmed

** Tags added: dcr-incoming

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Title:
  `who` command is broken in both gnu-coreutils and rust-coreutils

Status in coreutils package in Ubuntu:
  Confirmed
Status in rust-coreutils package in Ubuntu:
  New

Bug description:
  Command "who" displays the list of users with open interactive
  sessions on the host:

  Ubuntu 24.04.3 LTS:
  $ who
  crosser  pts/0        2025-11-17 22:10 (2a02:8106:1:6801:e2a5:4c6b:50c8:c67f)

  Raspbian GNU/Linux 12 (bookworm):
  $ who
  crosser  pts/0        668814970213820297 (172.27.72.9)
  crosser  pts/1        668814970212950818 (172.27.72.9)

  Armbian Debian stable (trixie):
  $ who
  crosser  sshd pts/0   2025-11-17 22:13 (172.27.72.9)

  However on questing, "who" displays nothing.

  Questing and trixie do not have utmp file, but both have systemd
  libraries and should be build with enabled READUTMP_USE_SYSTEMD. It
  appears to be working fine on trixie. But it appears to not be working
  on questing. I verified that a simple C program that calls
  `sd_get_sessions()` and enumerates the result does get all correct
  information about logged in users.

  ProblemType: Bug
  DistroRelease: Ubuntu 25.10
  Package: rust-coreutils 0.2.2-0ubuntu2.1
  ProcVersionSignature: Ubuntu 6.17.0-6.6-generic 6.17.1
  Uname: Linux 6.17.0-6-generic x86_64
  ApportVersion: 2.33.1-0ubuntu3
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Nov 17 22:08:47 2025
  SourcePackage: rust-coreutils
  UpgradeStatus: No upgrade log present (probably fresh install)

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