agent crash upon lb vip-delete

Looks like lb vip-delete triggered both create and delete netns events.
The core file and logs will be at /cs-shared/bugs/<bug-id>

supervisord logs:
2015-10-08 06:55:01,131 INFO exited: contrail-vrouter-agent (terminated by SIGABRT (core dumped); not expected)

From test logs:
2015-10-08 06:55:00,887 - DEBUG - vip b7e0b20a-e5f2-46c6-9678-b17fd260d541 deleted successfully

vrouter.log:
2015-10-08 Thu 06:55:00:831.483 PDT harmonic-01 [Thread 140713299773184, Pid 17102]: loadbalancer property change vip_.address - +20.1.1.4 vip_.admin_state -0 +1 vip_.protocol - +HTTP vip_.protocol_port -0 +80 vip_.connection_limit -0 +-1 Members: Monitors:
2015-10-08 Thu 06:55:00:876.052 PDT harmonic-01 [Thread 140713726703360, Pid 17102]: Unkown type:
2015-10-08 Thu 06:55:00:876.099 PDT harmonic-01 [Thread 140713726703360, Pid 17102]: NetNS event notification for uuid: 311b1e84-76f4-450b-b344-e42c3daf3477 usable
2015-10-08 Thu 06:55:00:876.141 PDT harmonic-01 [Thread 140713726703360, Pid 17102]: NetNS run command: /usr/bin/opencontrail-vrouter-netns create loadbalancer e51e6671-58c6-4420-95e8-155af7224efd a5d037e3-f249-40cc-a26b-5118b62c82d9 2cbb0d6f-e07c-4b16-baa8-51dde2fdbd19 --vmi-left-ip 10.1.1.6/24 --vmi-right-ip 20.1.1.4/24 --vmi-left-mac 02:58:f8:f9:3c:00 --vmi-right-mac 02:16:b8:e1:d4:9e --gw-ip 20.1.1.1 --cfg-file /var/lib/contrail/loadbalancer/d1a3b926-664e-4097-9ad9-560b94c338bd/etc/haproxy/haproxy.cfg --pool-id d1a3b926-664e-4097-9ad9-560b94c338bd --update
2015-10-08 Thu 06:55:00:876.643 PDT harmonic-01 [Thread 140713726703360, Pid 17102]: Service run command queued: /usr/bin/opencontrail-vrouter-netns create loadbalancer e51e6671-58c6-4420-95e8-155af7224efd a5d037e3-f249-40cc-a26b-5118b62c82d9 2cbb0d6f-e07c-4b16-baa8-51dde2fdbd19 --vmi-left-ip 10.1.1.6/24 --vmi-right-ip 20.1.1.4/24 --vmi-left-mac 02:58:f8:f9:3c:00 --vmi-right-mac 02:16:b8:e1:d4:9e --gw-ip 20.1.1.1 --cfg-file /var/lib/contrail/loadbalancer/d1a3b926-664e-4097-9ad9-560b94c338bd/etc/haproxy/haproxy.cfg --pool-id d1a3b926-664e-4097-9ad9-560b94c338bd --update
2015-10-08 Thu 06:55:00:924.747 PDT harmonic-01 [Thread 140713672124160, Pid 17102]: Unkown type:
2015-10-08 Thu 06:55:00:924.815 PDT harmonic-01 [Thread 140713672124160, Pid 17102]: service-instance properties change pool_id: -d1a3b926-664e-4097-9ad9-560b94c338bd +00000000-0000-0000-0000-000000000000
2015-10-08 Thu 06:55:00:924.843 PDT harmonic-01 [Thread 140713672124160, Pid 17102]: Unkown type:
2015-10-08 Thu 06:55:00:924.872 PDT harmonic-01 [Thread 140713672124160, Pid 17102]: NetNS event notification for uuid: 311b1e84-76f4-450b-b344-e42c3daf3477 not usable
2015-10-08 Thu 06:55:00:924.890 PDT harmonic-01 [Thread 140713672124160, Pid 17102]: Stopping service instance!
2015-10-08 Thu 06:55:00:924.930 PDT harmonic-01 [Thread 140713672124160, Pid 17102]: Service stop command queued: /usr/bin/opencontrail-vrouter-netns destroy loadbalancer e51e6671-58c6-4420-95e8-155af7224efd a5d037e3-f249-40cc-a26b-5118b62c82d9 2cbb0d6f-e07c-4b16-baa8-51dde2fdbd19 --cfg-file /var/lib/contrail/loadbalancer/d1a3b926-664e-4097-9ad9-560b94c338bd/etc/haproxy/haproxy.cfg --pool-id d1a3b926-664e-4097-9ad9-560b94c338bd
2015-10-08 Thu 06:55:01:032.043 PDT harmonic-01 [Thread 140713709909760, Pid 17102]: ID-PERM not set for object <default-domain:TestLbaas-13454226:default-domain__TestLbaas-13454226__d1a3b926-664e-4097-9ad9-560b94c338bd__2__left__2> Table <__ifmap__.virtual_machine_interface.0>. Converting to DELETE
2015-10-08 Thu 06:55:01:032.115 PDT harmonic-01 [Thread 140713709909760, Pid 17102]: VN change sync for Port default-domain:TestLbaas-13454226:default-domain__TestLbaas-13454226__d1a3b926-664e-4097-9ad9-560b94c338bd__2__left__2
2015-10-08 Thu 06:55:01:032.363 PDT harmonic-01 [Thread 140713709909760, Pid 17102]: Unkown type:
2015-10-08 Thu 06:55:01:033.670 PDT harmonic-01 [Thread 140713884899264, Pid 17102]: NetNS run errors:
Traceback (most recent call last):
  File "/usr/bin/opencontrail-vrouter-netns", line 9, in <module>
    load_entry_point('opencontrail-vrouter-netns==0.1', 'console_scripts', 'opencontrail-vrouter-netns')()
  File "/usr/lib/python2.7/dist-packages/opencontrail_vrouter_netns/vrouter_netns.py", line 466, in main
    vrouter_netns.args.func()
  File "/usr/lib/python2.7/dist-packages/opencontrail_vrouter_netns/vrouter_netns.py", line 423, in create
    netns_mgr.set_lbaas()
  File "/usr/lib/python2.7/dist-packages/opencontrail_vrouter_netns/vrouter_netns.py", line 161, in set_lbaas
    self.ip_ns.netns.execute([self.LBAAS_PROCESS, '-f', self.cfg_file, '-D', '-p', pid_file, '-sf', pid])
  File "/usr/lib/python2.7/dist-packages/opencontrail_vrouter_netns/linux/ip_lib.py", line 496, in execute
    check_exit_code=check_exit_code)
  File "/usr/lib/python2.7/dist-packages/opencontrail_vrouter_netns/linux/utils.py", line 86, in execute
    raise RuntimeError(m)
RuntimeError:
Command: ['sudo', 'ip', 'netns', 'exec', 'vrouter-e51e6671-58c6-4420-95e8-155af7224efd:d1a3b926-664e-4097-9ad9-560b94c338bd', 'haproxy', '-f', '/var/lib/contrail/loadbalancer/d1a3b926-664e-4097-9ad9-560b94c338bd/etc/haproxy/haproxy.cfg', '-D', '-p', '/var/lib/contrail/loadbalancer/d1a3b926-664e-4097-9ad9-560b94c338bd/etc/haproxy/haproxy.cfg.pid', '-sf', '29762']
Exit code: 1
Stdout: ''
Stderr: '[ALERT] 280/065501 (30979) : Could not open configuration file /var/lib/contrail/loadbalancer/d1a3b926-664e-4097-9ad9-560b94c338bd/etc/haproxy/haproxy.cfg : No such file or directory\n'

2015-10-08 Thu 06:55:01:059.867 PDT harmonic-01 [Thread 140713709909760, Pid 17102]: !!!! ERROR !!!! Task caught fatal exception: vector::_M_range_check TaskImpl: 0x7ffa81162640