Segmentation fault was returned after trying to execute "write terminal" in aaa group configuration menu

[alrukav]

Problem Description:

Segmentation fault was returned after trying to execute "write terminal" in aaa group configuration menu

OpenSwitch version:

OpenSwitch 0.4.0 (Build: appliance-ops-0.4.0-meraswitch/devel/master-20170330163417-dev)

Test Topology:

one DUT.

Steps to reproduce the problem (see attached files):

1. Configure DUT:

root@switch:~# vtysh
switch# conf t

switch(config)# hostname ops
switch(config)# aaa group server tacacs_plus tacgr1

2. Try to execute "write terminal" command on DUT. - NOK: segmentation fault.

ops(config-sg)# write terminal 
Current configuration:
!
hostname ops
Segmentation fault
root@switch:~#

Small debug info:

root@switch:~# gdb vtysh
(gdb) run
Starting program: /usr/bin/vtysh 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/libthread_db.so.1".
ops# conf t
ops(config)# do sh run
Current configuration:
!
!Version OpenSwitch 0.4.0 (Build: appliance-ops-0.4.0-meraswitch/devel/master-20170330163417-dev)
!Schema version 0.1.8
hostname ops
timezone set utc
!
!
!
!
aaa group server tacacs_plus tacgr1
aaa authentication login default local
aaa authorization commands default none
!
!
!
!
vlan 1
    no shutdown
ops(config)# aaa group server tacacs_plus tacgr1
ops(config-sg)# write terminal

Current configuration:
!
hostname ops
[New Thread 0x7ffff021a700 (LWP 584)]

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff6b18fee in ?? () from /usr/lib/libops-cli.so.0.0.0
(gdb) bt
#0  0x00007ffff6b18fee in ?? () from /usr/lib/libops-cli.so.0.0.0
#1  0x00007ffff6b18a25 in ?? () from /usr/lib/libops-cli.so.0.0.0
#2  0x00007ffff6b1f532 in ?? () from /usr/lib/libops-cli.so.0.0.0
#3  0x00007ffff6b1f700 in cmd_execute_command ()
   from /usr/lib/libops-cli.so.0.0.0
#4  0x000000000041bc7f in ?? ()
#5  0x000000000041c169 in vtysh_execute ()
#6  0x000000000041a541 in main ()