Restarting a networking service generates warnings during loopback configuration

[nazariig]

Description

Restarting the networking service produces warning message:

May 17 17:22:39.437459 r-leopard-01 INFO networking[148381]: warning: lo: post-up cmd 'ip addr del 127.0.0.1/8 dev lo' failed: returned 2 (RTNETLINK answers: Cannot assign requested address

This indicates an issue with a networking configuration in SONiC.

The culprit: #5353

Steps to reproduce the issue:

1. Stop swss

service swss stop

2. Restart networking

service networking restart

Describe the results you received:

May 17 17:22:38.674803 r-leopard-01 INFO systemd[1]: Stopping Network initialization...
May 17 17:22:38.692557 r-leopard-01 INFO networking[148335]: networking: Deconfiguring network interfaces
May 17 17:22:39.029514 r-leopard-01 INFO systemd[1]: networking.service: Succeeded.
May 17 17:22:39.031028 r-leopard-01 INFO systemd[1]: Stopped Network initialization.
May 17 17:22:39.035776 r-leopard-01 INFO systemd[1]: Starting Network initialization...
May 17 17:22:39.045325 r-leopard-01 INFO networking[148369]: networking: Configuring network interfaces
May 17 17:22:39.437459 r-leopard-01 INFO networking[148381]: warning: lo: post-up cmd 'ip addr del 127.0.0.1/8 dev lo' failed: returned 2 (RTNETLINK answers: Cannot assign requested address
May 17 17:22:39.437553 r-leopard-01 INFO networking[148381]: )
May 17 17:22:39.467299 r-leopard-01 INFO kernel: [14860.473137] 8021q: adding VLAN 0 to HW filter on device eth0
May 17 17:22:39.817921 r-leopard-01 INFO systemd[1]: Finished Network initialization.

Describe the results you expected:

No errors are expected

Output of show version:

• N/A

Output of show techsupport:

• N/A

Additional information you deem important (e.g. issue happens only occasionally):

• N/A

[nazariig]

@saiarcot895 FYI