Bug 2192859

Summary:	udev adds an unwanted altname to a renamed netdevice
Product:	Red Hat Enterprise Linux 9	Reporter:	Michal Schmidt <mschmidt>
Component:	systemd	Assignee:	David Tardon <dtardon>
Status:	POST ---	QA Contact:	Frantisek Sumsal <fsumsal>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	9.2	CC:	dtardon, keyoung, msekleta, sscheink, systemd-maint-list
Target Milestone:	rc	Keywords:	Bugfix, Triaged
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Description Michal Schmidt 2023-05-03 10:51:25 UTC

Description of problem:
In https://issues.redhat.com/browse/OCPBUGS-11281, it has been observed that when you rename a net device with 'ip link ... set name ...', the device's previous name becomes its altname. This causes a problem when you try to rename the device back and the existence of the altname prevents you. OCP ran into this issue.

Version-Release number of selected component (if applicable):
in RHEL 9.2: systemd-252-8.el9.x86_64
also in Fedora ELN: systemd-253.2-1.eln126.x86_64

How reproducible:
always

Steps to Reproduce:

[root@localhost ~]# ip link show enp1s0
2: enp1s0: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel state DOWN mode DEFAULT group default qlen 1000
    link/ether 52:54:00:a2:18:9e brd ff:ff:ff:ff:ff:ff
[root@localhost ~]# ip link set enp1s0 name foo
[root@localhost ~]# ip link show foo
2: foo: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel state DOWN mode DEFAULT group default qlen 1000
    link/ether 52:54:00:a2:18:9e brd ff:ff:ff:ff:ff:ff
    altname enp1s0

Actual results:
'foo' now has 'enp1s0' as its altname.

Expected results:
No new altname.

Additional info:
In RHEL 8, it behaves as expected.

Proposed fix for upstream: 
https://github.com/systemd/systemd/pull/27506

Comment 1 Sebastian Scheinkman 2023-05-22 12:11:25 UTC

A different PR to handle this was merged https://github.com/systemd/systemd/pull/27655

Do you know when RHEL will be able to pick this one?

Comment 2 Michal Sekletar 2023-08-17 12:08:41 UTC

(In reply to Sebastian Scheinkman from comment #1)
> A different PR to handle this was merged
> https://github.com/systemd/systemd/pull/27655
> 
> Do you know when RHEL will be able to pick this one?

We are going to address the issue in RHEL-9.3.