------- Comment From [email protected] 2021-06-23 18:19 EDT-------
Files content:
root@ilabg13:~# cat /etc/systemd/network/10-enP53p0s0.link
[Match]
MACAddress=82:0c:9b:c9:78:f8

[Link]
Name=enP53p0s0
root@ilabg13:~# cat /usr/lib/systemd/network/99-default.link
#  SPDX-License-Identifier: LGPL-2.1+
#
#  This file is part of systemd.
#
#  systemd is free software; you can redistribute it and/or modify it
#  under the terms of the GNU Lesser General Public License as published by
#  the Free Software Foundation; either version 2.1 of the License, or
#  (at your option) any later version.

[Match]
OriginalName=*

[Link]
NamePolicy=keep kernel database onboard slot path
AlternativeNamesPolicy=database onboard slot path
MACAddressPolicy=persistent

Steeps followed to retrieve logs:
- Manually remove the IP
root@ilabg13:~# date
Wed Jun 23 15:08:41 MST 2021
root@ilabg13:~# ip addr del 192.168.171.53/24 dev enP53p0s0.171

- Try to assign ip via netplan
root@ilabg13:~# date
Wed Jun 23 15:10:14 MST 2021
root@ilabg13:~# netplan apply

- Checking networkctl 10sec and 30sec after
root@ilabg13:~# date
Wed Jun 23 15:11:19 MST 2021
root@ilabg13:~# networkctl status enP53p0s0.171 --no-pager
? 9: enP53p0s0.171
Link File: n/a
Network File: n/a
Type: vlan
State: degraded (pending)
HW Address: 82:0c:9b:c9:78:f8
MTU: 9000 (max: 65535)
Queue Length (Tx/Rx): 1/1
Auto negotiation: yes
Speed: 25Gbps
Duplex: full
Address: fe80::800c:9bff:fec9:78f8
Activation Policy: up

Jun 23 15:10:25 ilabg13.tuc.stglabs.ibm.com systemd-networkd[9805]: 
enP53p0s0.171: Flags change: +UP +LOWER_UP +RUNNING +MULTICAST +BROADCAST
Jun 23 15:10:25 ilabg13.tuc.stglabs.ibm.com systemd-networkd[9805]: 
enP53p0s0.171: Link 9 added
Jun 23 15:10:25 ilabg13.tuc.stglabs.ibm.com systemd-networkd[9805]: 
enP53p0s0.171: link pending udev initialization...
Jun 23 15:10:25 ilabg13.tuc.stglabs.ibm.com systemd-networkd[9805]: 
enP53p0s0.171: netdev has index 9
Jun 23 15:10:25 ilabg13.tuc.stglabs.ibm.com systemd-networkd[9805]: 
enP53p0s0.171: Saved original MTU: 9000
Jun 23 15:10:25 ilabg13.tuc.stglabs.ibm.com systemd-networkd[9805]: 
enP53p0s0.171: Remembering foreign address: fe80::800c:9bff:fec9:78f8/64 (valid 
forever)
Jun 23 15:10:25 ilabg13.tuc.stglabs.ibm.com systemd-networkd[9805]: 
enP53p0s0.171: Gained IPv6LL
Jun 23 15:10:25 ilabg13.tuc.stglabs.ibm.com systemd-networkd[9805]: 
enP53p0s0.171: Remembering route: dst: ff00::/8, src: n/a, gw: n/a, prefsrc: 
n/a, scope: global, table: loc?e: multicast
Jun 23 15:10:25 ilabg13.tuc.stglabs.ibm.com systemd-networkd[9805]: 
enP53p0s0.171: Remembering route: dst: fe80::800c:9bff:fec9:78f8/128, src: n/a, 
gw: n/a, prefsrc: n/a, scop? type: local
Jun 23 15:10:25 ilabg13.tuc.stglabs.ibm.com systemd-networkd[9805]: 
enP53p0s0.171: Remembering route: dst: fe80::/64, src: n/a, gw: n/a, prefsrc: 
n/a, scope: global, table: ma?ype: unicast
root@ilabg13:~#
root@ilabg13:~#
root@ilabg13:~# date
Wed Jun 23 15:11:44 MST 2021
root@ilabg13:~# networkctl status enP53p0s0.171 --no-pager
? 9: enP53p0s0.171
Link File: n/a
Network File: n/a
Type: vlan
State: degraded (pending)
HW Address: 82:0c:9b:c9:78:f8
MTU: 9000 (max: 65535)
Queue Length (Tx/Rx): 1/1
Auto negotiation: yes
Speed: 25Gbps
Duplex: full
Address: fe80::800c:9bff:fec9:78f8
Activation Policy: up

Jun 23 15:10:25 ilabg13.tuc.stglabs.ibm.com systemd-networkd[9805]: 
enP53p0s0.171: Flags change: +UP +LOWER_UP +RUNNING +MULTICAST +BROADCAST
Jun 23 15:10:25 ilabg13.tuc.stglabs.ibm.com systemd-networkd[9805]: 
enP53p0s0.171: Link 9 added
Jun 23 15:10:25 ilabg13.tuc.stglabs.ibm.com systemd-networkd[9805]: 
enP53p0s0.171: link pending udev initialization...
Jun 23 15:10:25 ilabg13.tuc.stglabs.ibm.com systemd-networkd[9805]: 
enP53p0s0.171: netdev has index 9
Jun 23 15:10:25 ilabg13.tuc.stglabs.ibm.com systemd-networkd[9805]: 
enP53p0s0.171: Saved original MTU: 9000
Jun 23 15:10:25 ilabg13.tuc.stglabs.ibm.com systemd-networkd[9805]: 
enP53p0s0.171: Remembering foreign address: fe80::800c:9bff:fec9:78f8/64 (valid 
forever)
Jun 23 15:10:25 ilabg13.tuc.stglabs.ibm.com systemd-networkd[9805]: 
enP53p0s0.171: Gained IPv6LL
Jun 23 15:10:25 ilabg13.tuc.stglabs.ibm.com systemd-networkd[9805]: 
enP53p0s0.171: Remembering route: dst: ff00::/8, src: n/a, gw: n/a, prefsrc: 
n/a, scope: global, table: loc?e: multicast
Jun 23 15:10:25 ilabg13.tuc.stglabs.ibm.com systemd-networkd[9805]: 
enP53p0s0.171: Remembering route: dst: fe80::800c:9bff:fec9:78f8/128, src: n/a, 
gw: n/a, prefsrc: n/a, scop? type: local
Jun 23 15:10:25 ilabg13.tuc.stglabs.ibm.com systemd-networkd[9805]: 
enP53p0s0.171: Remembering route: dst: fe80::/64, src: n/a, gw: n/a, prefsrc: 
n/a, scope: global, table: ma?ype: unicast
root@ilabg13:~#

- Trying workaround 15445:
root@ilabg13:~# date
Wed Jun 23 15:12:49 MST 2021
root@ilabg13:~# netplan apply
root@ilabg13:~# date
Wed Jun 23 15:13:08 MST 2021
root@ilabg13:~# networkctl reload
root@ilabg13:~# date
Wed Jun 23 15:13:34 MST 2021
root@ilabg13:~# networkctl renew enP53p0s0.171
Failed to renew dynamic configuration of interface enP53p0s0.171: Interface 
enP53p0s0.171 is not managed by systemd-networkd
root@ilabg13:~# date
Wed Jun 23 15:13:56 MST 2021
root@ilabg13:~# networkctl renew enP53p0s0.171
Failed to renew dynamic configuration of interface enP53p0s0.171: Interface 
enP53p0s0.171 is not managed by systemd-networkd
root@ilabg13:~# date
Wed Jun 23 15:14:29 MST 2021
root@ilabg13:~# networkctl status enP53p0s0.171 --no-pager
? 9: enP53p0s0.171
Link File: n/a
Network File: n/a
Type: vlan
State: degraded (pending)
HW Address: 82:0c:9b:c9:78:f8
MTU: 9000 (max: 65535)
Queue Length (Tx/Rx): 1/1
Auto negotiation: yes
Speed: 25Gbps
Duplex: full
Address: fe80::800c:9bff:fec9:78f8
Activation Policy: up

Jun 23 15:12:54 ilabg13.tuc.stglabs.ibm.com systemd-networkd[10118]: 
enP53p0s0.171: Flags change: +UP +LOWER_UP +RUNNING +MULTICAST +BROADCAST
Jun 23 15:12:54 ilabg13.tuc.stglabs.ibm.com systemd-networkd[10118]: 
enP53p0s0.171: Link 9 added
Jun 23 15:12:54 ilabg13.tuc.stglabs.ibm.com systemd-networkd[10118]: 
enP53p0s0.171: link pending udev initialization...
Jun 23 15:12:54 ilabg13.tuc.stglabs.ibm.com systemd-networkd[10118]: 
enP53p0s0.171: netdev has index 9
Jun 23 15:12:54 ilabg13.tuc.stglabs.ibm.com systemd-networkd[10118]: 
enP53p0s0.171: Saved original MTU: 9000
Jun 23 15:12:54 ilabg13.tuc.stglabs.ibm.com systemd-networkd[10118]: 
enP53p0s0.171: Remembering foreign address: fe80::800c:9bff:fec9:78f8/64 (valid 
forever)
Jun 23 15:12:54 ilabg13.tuc.stglabs.ibm.com systemd-networkd[10118]: 
enP53p0s0.171: Gained IPv6LL
Jun 23 15:12:54 ilabg13.tuc.stglabs.ibm.com systemd-networkd[10118]: 
enP53p0s0.171: Remembering route: dst: ff00::/8, src: n/a, gw: n/a, prefsrc: 
n/a, scope: global, table: lo?e: multicast
Jun 23 15:12:54 ilabg13.tuc.stglabs.ibm.com systemd-networkd[10118]: 
enP53p0s0.171: Remembering route: dst: fe80::800c:9bff:fec9:78f8/128, src: n/a, 
gw: n/a, prefsrc: n/a, sco? type: local
Jun 23 15:12:54 ilabg13.tuc.stglabs.ibm.com systemd-networkd[10118]: 
enP53p0s0.171: Remembering route: dst: fe80::/64, src: n/a, gw: n/a, prefsrc: 
n/a, scope: global, table: m?ype: unicast
root@ilabg13:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: encdb0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UP group 
default qlen 1000
link/ether 02:76:54:00:00:03 brd ff:ff:ff:ff:ff:ff
inet 11.111.114.213/22 brd 11.111.115.255 scope global encdb0
valid_lft forever preferred_lft forever
inet6 fe80::76:54ff:fe00:3/64 scope link
valid_lft forever preferred_lft forever
3: ence0f: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group 
default qlen 1000
link/ether 02:76:54:00:00:04 brd ff:ff:ff:ff:ff:ff
inet 9.11.116.213/24 brd 9.11.116.255 scope global ence0f
valid_lft forever preferred_lft forever
inet6 2002:90b:e006:116:76:54ff:fe00:4/64 scope global dynamic mngtmpaddr 
noprefixroute
valid_lft 2591765sec preferred_lft 604565sec
inet6 fe80::76:54ff:fe00:4/64 scope link
valid_lft forever preferred_lft forever
4: encdc0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UP group 
default qlen 1000
link/ether 02:76:54:00:00:04 brd ff:ff:ff:ff:ff:ff
inet 11.111.112.213/22 brd 11.111.115.255 scope global encdc0
valid_lft forever preferred_lft forever
inet6 fe80::76:54ff:fe00:4/64 scope link
valid_lft forever preferred_lft forever
5: encdc0.150@encdc0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc noqueue 
state UP group default qlen 1000
link/ether 02:76:54:00:00:04 brd ff:ff:ff:ff:ff:ff
inet 192.168.150.53/24 brd 192.168.150.255 scope global encdc0.150
valid_lft forever preferred_lft forever
inet6 fe80::76:54ff:fe00:4/64 scope link
valid_lft forever preferred_lft forever
6: encdb0.160@encdb0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc noqueue 
state UP group default qlen 1000
link/ether 02:76:54:00:00:03 brd ff:ff:ff:ff:ff:ff
inet 192.168.160.53/24 brd 192.168.160.255 scope global encdb0.160
valid_lft forever preferred_lft forever
inet6 fe80::76:54ff:fe00:3/64 scope link
valid_lft forever preferred_lft forever
7: enP50s3832: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UP 
group default qlen 1000
link/ether 82:0c:9b:a8:a1:b2 brd ff:ff:ff:ff:ff:ff
inet6 fe80::800c:9bff:fea8:a1b2/64 scope link
valid_lft forever preferred_lft forever
8: enP53p0s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UP 
group default qlen 1000
link/ether 82:0c:9b:c9:78:f8 brd ff:ff:ff:ff:ff:ff
inet6 fe80::800c:9bff:fec9:78f8/64 scope link
valid_lft forever preferred_lft forever
9: enP53p0s0.171@enP53p0s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc 
noqueue state UP group default qlen 1000
link/ether 82:0c:9b:c9:78:f8 brd ff:ff:ff:ff:ff:ff
inet6 fe80::800c:9bff:fec9:78f8/64 scope link
valid_lft forever preferred_lft forever
10: enP50s3832.170@enP50s3832: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc 
noqueue state UP group default qlen 1000
link/ether 82:0c:9b:a8:a1:b2 brd ff:ff:ff:ff:ff:ff
inet 192.168.170.53/24 brd 192.168.170.255 scope global enP50s3832.170
valid_lft forever preferred_lft forever
inet6 fe80::800c:9bff:fea8:a1b2/64 scope link
valid_lft forever preferred_lft forever

Gave some time between netplan apply and check without success, I can
leave it for hours and the IP never gets assigned, maybe what you are
seeing is the manual assignment that I did with ip addr add
192.168.171.53/24 dev enP53p0s0.171

Attaching logs...

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https://bugs.launchpad.net/bugs/1929657

Title:
  [Ubuntu 20.4.2]  vLan not getting static IP assigned (on s390x)

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