FRR interface config mode errors seen

[Naveen K Suvarna]

Hi All,
    In FRR 7.2,  I am seeing interface command Failures as below.   This is happening randomly.  Once system goes in to this state,  failure happens for all interfaces.
    Is this a known issue ?  Is there any fix for this ?


dut4(config)# interface Vlan2
% Configuration failed: validation error.
Please check the logs for more details.
dut4(config)# interface Ethernet0
% Configuration failed: validation error.
Please check the logs for more details.
dut4(config)# interface Ethernet0
% Configuration failed: validation error.
Please check the logs for more details.
dut4(config)# interface Vlan2
% Configuration failed: validation error.
Please check the logs for more details.
dut4(config)#

Not much logs generated, except below.
Call to if_lookup_by_name_all_vrf(ifname) Fails leading to below error
root at dut4:/# tail -f /var/log/frr/myfrr.log
2020/01/06 04:21:37 ZEBRA: lib_interface_destroy: only inactive interfaces can be deleted
2020/01/06 04:21:37 ZEBRA: [EC 100663331] nb_callback_configuration: error processing configuration change: error [validation error] event [validate] operation [destroy] xpath [/frr-interface:lib/interface[name='Ethernet32'][vrf='default']]
2020/01/06 04:21:37 ZEBRA: [EC 100663337] nb_candidate_commit_prepare: failed to validate candidate configuration
2020/01/06 04:22:24 ZEBRA: lib_interface_destroy: only inactive interfaces can be deleted
2020/01/06 04:22:24 ZEBRA: [EC 100663331] nb_callback_configuration: error processing configuration change: error [validation error] event [validate] operation [destroy] xpath [/frr-interface:lib/interface[name='Ethernet32'][vrf='default']]
2020/01/06 04:22:24 ZEBRA: [EC 100663337] nb_candidate_commit_prepare: failed to validate candidate configuration
Regards
Naveen
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