Description of problem:
Beaker run: https://beaker.engineering.redhat.com/jobs/1048794

Aug 13 05:23:30 myown.hostname nmcli/./runtest.sh[32048]: Running test vpn_add_profile
...
Aug 13 05:23:31 myown.hostname NetworkManager[28382]: <debug> [1439457811.882092] [rdisc/nm-lndp-rdisc.c:276] event_ready(): (eth0): processing libndp events.
Aug 13 05:23:31 myown.hostname NetworkManager[28382]: <debug> [1439457811.882185] [rdisc/nm-lndp-rdisc.c:276] event_ready(): (eth1): processing libndp events.
Aug 13 05:23:31 myown.hostname NetworkManager[28382]: <debug> [1439457811.882206] [rdisc/nm-lndp-rdisc.c:276] event_ready(): (eth2): processing libndp events.
Aug 13 05:23:32 myown.hostname NetworkManager[28382]: <debug> [1439457812.144895] [nm-bus-manager.c:153] private_server_new_connection(): (private) accepted connection 0x7fc62803a830 on private socket.
Aug 13 05:23:32 myown.hostname NetworkManager[28382]: <debug> [1439457812.202711] [settings/nm-agent-manager.c:1175] nm_agent_manager_get_secrets(): Secrets requested for connection /org/freedesktop/NetworkManager/Settings/15 (vpn/connection)
Aug 13 05:23:32 myown.hostname NetworkManager[28382]: <debug> [1439457812.202762] [settings/nm-settings-connection.c:1036] nm_settings_connection_get_secrets(): settings-connection[0x7fc65576bf20,5b34d793-d8bb-48da-a46a-c66395e8aab9]: (connection:6) secrets requested flags 0x40000004 hints '(none)'
Aug 13 05:23:32 myown.hostname NetworkManager[28382]: <debug> [1439457812.202803] [settings/nm-settings-connection.c:839] agent_secrets_done_cb(): settings-connection[0x7fc65576bf20,5b34d793-d8bb-48da-a46a-c66395e8aab9]: (connection:6) secrets request error: (4) No agents were available for this request.
Aug 13 05:23:32 myown.hostname NetworkManager[28382]: <debug> [1439457812.205088] [settings/nm-agent-manager.c:1175] nm_agent_manager_get_secrets(): Secrets requested for connection /org/freedesktop/NetworkManager/Settings/15 (vpn/ipv4)
Aug 13 05:23:32 myown.hostname NetworkManager[28382]: <debug> [1439457812.205131] [settings/nm-settings-connection.c:1036] nm_settings_connection_get_secrets(): settings-connection[0x7fc65576bf20,5b34d793-d8bb-48da-a46a-c66395e8aab9]: (ipv4:7) secrets requested flags 0x40000004 hints '(none)'
Aug 13 05:23:32 myown.hostname NetworkManager[28382]: <debug> [1439457812.205157] [settings/nm-settings-connection.c:839] agent_secrets_done_cb(): settings-connection[0x7fc65576bf20,5b34d793-d8bb-48da-a46a-c66395e8aab9]: (ipv4:7) secrets request error: (4) No agents were available for this request.
Aug 13 05:23:32 myown.hostname NetworkManager[28382]: <debug> [1439457812.205623] [settings/nm-agent-manager.c:1175] nm_agent_manager_get_secrets(): Secrets requested for connection /org/freedesktop/NetworkManager/Settings/15 (vpn/ipv6)
Aug 13 05:23:32 myown.hostname NetworkManager[28382]: <debug> [1439457812.205657] [settings/nm-settings-connection.c:1036] nm_settings_connection_get_secrets(): settings-connection[0x7fc65576bf20,5b34d793-d8bb-48da-a46a-c66395e8aab9]: (ipv6:8) secrets requested flags 0x40000004 hints '(none)'
Aug 13 05:23:32 myown.hostname NetworkManager[28382]: <debug> [1439457812.205679] [settings/nm-settings-connection.c:839] agent_secrets_done_cb(): settings-connection[0x7fc65576bf20,5b34d793-d8bb-48da-a46a-c66395e8aab9]: (ipv6:8) secrets request error: (4) No agents were available for this request.
Aug 13 05:23:32 myown.hostname NetworkManager[28382]: <debug> [1439457812.209174] [settings/nm-agent-manager.c:1175] nm_agent_manager_get_secrets(): Secrets requested for connection /org/freedesktop/NetworkManager/Settings/15 (vpn/vpn)
Aug 13 05:23:32 myown.hostname NetworkManager[28382]: <debug> [1439457812.209229] [settings/nm-settings-connection.c:1036] nm_settings_connection_get_secrets(): settings-connection[0x7fc65576bf20,5b34d793-d8bb-48da-a46a-c66395e8aab9]: (vpn:9) secrets requested flags 0x40000004 hints '(none)'
Aug 13 05:23:32 myown.hostname NetworkManager[28382]: <debug> [1439457812.209488] [settings/nm-agent-manager.c:1084] get_start(): (0x7fc655d55f70/vpn/vpn) system settings secrets insufficient, asking agents
Aug 13 05:23:32 myown.hostname NetworkManager[28382]: <debug> [1439457812.209508] [settings/nm-settings-connection.c:893] agent_secrets_done_cb(): settings-connection[0x7fc65576bf20,5b34d793-d8bb-48da-a46a-c66395e8aab9]: (vpn:9) existing secrets returned
Aug 13 05:23:32 myown.hostname NetworkManager[28382]: <debug> [1439457812.209522] [settings/nm-settings-connection.c:898] agent_secrets_done_cb(): settings-connection[0x7fc65576bf20,5b34d793-d8bb-48da-a46a-c66395e8aab9]: (vpn:9) secrets request completed
Aug 13 05:23:32 myown.hostname NetworkManager[28382]: <debug> [1439457812.210326] [settings/nm-settings-connection.c:941] agent_secrets_done_cb(): settings-connection[0x7fc65576bf20,5b34d793-d8bb-48da-a46a-c66395e8aab9]: (vpn:9) new agent secrets processed
Aug 13 05:23:32 myown.hostname NetworkManager[28382]: (NetworkManager:28382): GLib-CRITICAL **: '(@a{s{a{sv}}})' is not a valid GVariant format string
Aug 13 05:23:32 myown.hostname kernel: traps: NetworkManager[28382] trap int3 ip:7fc6514078c3 sp:7fffa9292cc0 error:0
Aug 13 05:23:32 myown.hostname systemd[1]: NetworkManager.service: main process exited, code=dumped, status=5/TRAP
Aug 13 05:23:32 myown.hostname systemd[1]: Unit NetworkManager.service entered failed state.

Version-Release number of selected component:
NetworkManager-1.1.0-12796.8810036895.el7.centos

Additional info:
reporter:       libreport-2.1.11
backtrace_rating: 4
cmdline:        /usr/sbin/NetworkManager --no-daemon
crash_function: valid_format_string
executable:     /usr/sbin/NetworkManager
kernel:         3.10.0-302.el7.x86_64
runlevel:       N 3
type:           CCpp
uid:            0

Truncated backtrace:
Thread no. 1 (7 frames)
 #2 valid_format_string at gvariant.c:4443
 #3 g_variant_new at gvariant.c:5185
 #4 dbus_get_agent_secrets_cb at settings/nm-settings-connection.c:1669
 #5 agent_secrets_done_cb at settings/nm-settings-connection.c:960
 #6 get_complete_cb at settings/nm-agent-manager.c:1124
 #7 req_complete_success at settings/nm-agent-manager.c:481
 #8 get_start at settings/nm-agent-manager.c:1091