EL9 package rabbitmq-server-4.1.1-1.el8.noarch from rabbitmq-el9-noarch requires erlang < 28.0, but none of the providers can be installed

[slarti-b]

Describe the bug

Have rabbit installed from your repos on Oracle Linux 9 (so EL9 family). The dnf upgrade just started failing

# dnf clean all && dnf makecache && dnf upgrade
60 files removed
MongoDB Repository                                                                                                                                                         117 kB/s |  67 kB     00:00
Oracle Linux 9 EPEL Packages for Development (x86_64)                                                                                                                       38 MB/s |  30 MB     00:00
Oracle Linux 9 BaseOS Latest (x86_64)                                                                                                                                       49 MB/s |  66 MB     00:01
Oracle Linux 9 Application Stream Packages (x86_64)                                                                                                                         66 MB/s |  61 MB     00:00
modern-erlang-el9                                                                                                                                                          1.7 MB/s | 755 kB     00:00
rabbitmq-el9-noarch                                                                                                                                                        2.2 MB/s | 1.3 MB     00:00
Oracle Linux 9 UEK Release 7 (x86_64)                                                                                                                                       74 MB/s |  66 MB     00:00
Metadata cache created.
Last metadata expiration check: 0:00:25 ago on Fri 06 Jun 2025 17:37:08 EEST.
Error:
 Problem: package rabbitmq-server-4.1.1-1.el8.noarch from rabbitmq-el9-noarch requires erlang < 28.0, but none of the providers can be installed
  - cannot install both erlang-28.0-1.el9.x86_64 from modern-erlang and erlang-27.3.4-1.el9.x86_64 from @System
  - cannot install both erlang-28.0-1.el9.x86_64 from modern-erlang and erlang-26.2.5-1.el9.x86_64 from ol9_developer_EPEL
  - cannot install both erlang-27.3.4-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-27.3.3-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-27.3.2-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-27.3.1-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-27.3-2.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-27.3-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-27.2.4-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-27.2.3-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-27.2.2-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-27.2.1-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-27.2-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-27.1.3-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-27.1.2-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-26.2.5.12-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-26.2.5.11-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-26.2.5.10-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-26.2.5.9-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-26.2.5.8-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-26.2.5.7-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-26.2.5.6-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-26.2.5.5-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-26.1.2-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-26.0.2-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-25.3.2.21-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-25.3.2.20-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-25.3.2.19-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-25.3.2.18-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-25.3.2.16-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-25.3.2.15-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-25.2.3-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-24.3.4.15-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install both erlang-24.3.4.14-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang
  - cannot install the best update candidate for package rabbitmq-server-4.1.0-1.el8.noarch
  - cannot install the best update candidate for package erlang-27.3.4-1.el9.x86_64
(try to add '--allowerasing' to command line to replace conflicting packages or '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)

Feels like same/similar issue to #131 but from the comment there I thought future packages would be built using a proper EL9 distro.

The repos I have active are just standard oracle linux base repos,, Oracle EPEL repo, Mongo Db, Mono and rabbit and erlang

# dnf repolist
repo id                                                                              repo name
modern-erlang                                                                        modern-erlang-el9
mongodb-org                                                                          MongoDB Repository
ol9_UEKR7                                                                            Oracle Linux 9 UEK Release 7 (x86_64)
ol9_appstream                                                                        Oracle Linux 9 Application Stream Packages (x86_64)
ol9_baseos_latest                                                                    Oracle Linux 9 BaseOS Latest (x86_64)
ol9_developer_EPEL                                                                   Oracle Linux 9 EPEL Packages for Development (x86_64)
rabbitmq-el9-noarch                                                                  rabbitmq-el9-noarch

The repo definitions are as described in rabbit setup guideliens 8except i take the keys from my own server, but they are copies)

rabbit.repo

[modern-erlang]
name=modern-erlang-el9
baseurl=https://yum1.rabbitmq.com/erlang/el/9/$basearch
        https://yum2.rabbitmq.com/erlang/el/9/$basearch
repo_gpgcheck=1
enabled=1
gpgkey=https://intfilerepo.carus.com/keys/cloudsmith.rabbitmq-erlang.E495BB49CC4BBE5B.key
gpgcheck=1
sslverify=1
sslcacert=/etc/pki/tls/certs/ca-bundle.crt
metadata_expire=300
pkg_gpgcheck=1
autorefresh=1
type=rpm-md

[rabbitmq-el9-noarch]
name=rabbitmq-el9-noarch
baseurl=https://yum2.rabbitmq.com/rabbitmq/el/9/noarch
        https://yum1.rabbitmq.com/rabbitmq/el/9/noarch
repo_gpgcheck=1
enabled=1
# Cloudsmith's repository key and RabbitMQ package signing key
gpgkey=https://intfilerepo.carus.com/keys/cloudsmith.rabbitmq-server.9F4587F226208342.key
       https://intfilerepo.carus.com/keys/rabbitmq-release-signing-key.asc
gpgcheck=1
sslverify=1
sslcacert=/etc/pki/tls/certs/ca-bundle.crt
metadata_expire=300
pkg_gpgcheck=1
autorefresh=1
type=rpm-md

Reproduction steps

1. Have a server with repos as shown above and rabbit/erlang installed
   2.Run dnf upgrade

Expected behavior

It updates the packages needed

Additional context

No response

[michaelklishin]

It has nothing to do with this package or #131.

The RabbitMQ package correctly lists the supported Erlang version range.

The mirror provides all Erlang versions published to Cloudsmith. Or at least that's been the case for two years and I don't see why it wouldn't be the case but that's my best guess as to what trips up dnf.

[michaelklishin]

cannot install both erlang-27.3.4-1.el9.x86_64 from modern-erlang and erlang-28.0-1.el9.x86_64 from modern-erlang

suggests that both 27.3.4 and 28.0 are discovered in our repository. So, a supported version is available.

I guess for now we have no choice but to remove Erlang 28 packages, even though our package metadata and the repos all do what they are supposed to: list the latest version supported and provide like five different majors.

[michaelklishin]

I have deleted Erlang 28.x packages from yum1.rabbitmq.com and yum2.rabbitmq.com. I guess we'll have to stop publishing them until RabbitMQ officially supports Erlang 28.

It's a mystery to me why dnf cannot resolve the correct version of one dependency when multiple versions are provided in the same repo, and some versions are newer than what rabbitmq-server supports.

[slarti-b]

Many thanks!

I fully agree that I don't understand why dnf couldn't just install the one needed. Maybe because the dnf update command is essentially saying "update all installed stuff to latest" so it's trying to update Rabbit to its latest (which requires erlang 27) and also update erlang to its latest which would be 28.