ansible 2.5.1 need upgrade to 2.5.2 or 2.5.3 (bug with set_facts)

[George Shuklin]

Version of ansible 2.5.1 has a nasty bug. Following playbook will show foo == [3], when every other version of ansible (including 2.5.0 and 2.5.3, 2.4 and 2.6) show that foo == [1,2,3].

Please, upload a newer minor version of ansible.

Playbook in question:

 - hosts: localhost
   tasks:
     - set_fact:
         foo: []
     - set_fact:
         foo: '{{ foo + [item] }}'
       with_items: [1, 2, 3]
     - debug: var=foo

Affected version: 2.5.1+dfsg-1

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ansible 2.5.1+dfsg-1
ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
Uname: Linux 4.15.0-23-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: X-Cinnamon
Date: Thu Jul 5 17:03:46 2018
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-xenial-amd64-20160624-2
EcryptfsInUse: Yes
InstallationDate: Installed on 2017-06-22 (378 days ago)
InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 20160624-10:47
PackageArchitecture: all
SourcePackage: ansible
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.ansible.ansible.cfg: [modified]
mtime.conffile..etc.ansible.ansible.cfg: 2018-04-05T15:38:10.672150

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Nicolas Delvaux (malizor)]

Note that Debian Stretch Backport is already up to date. So this is just a matter of syncing version 2.5.2+dfsg-1~bpo9+1 from there.

[Delvento (delvento)]

Moreover, ansible v2.5.1 is affected by https://github.com/ansible/ansible/issues/54618 which has been (partially) fixed in v2.5.3 so I recommend going to v2.5.3 not v2.5.2

[Bryce Harrington (bryce)]

The append to list bug is also reported in 1825096, but this bug report can focus on the upstream issue https://github.com/ansible/ansible/issues/54618 that's from 2.5.3.