Comment 2 for bug 967426

StacktraceTop:
 dhclient_start (client=<optimized out>, mode_opt=0x4ad3dd "-N", release=0) at nm-dhcp-dhclient.c:647
 nm_dhcp_client_start_ip6 (self=0x7fa27c0170c0, s_ip6=0x2060580, dhcp_anycast_addr=0x0, hostname=0x0, info_only=0) at nm-dhcp-client.c:493
 client_start (self=0x20afde0, iface=<optimized out>, uuid=<optimized out>, ipv6=1, s_ip4=0x0, s_ip6=0x2060580, timeout=0, dhcp_anycast_addr=0x0, hostname=0x0, info_only=0) at nm-dhcp-manager.c:446
 nm_dhcp_manager_start_ip6 (self=<optimized out>, iface=<optimized out>, uuid=<optimized out>, s_ip6=<optimized out>, timeout=<optimized out>, dhcp_anycast_addr=<optimized out>, info_only=0) at nm-dhcp-manager.c:519
 dhcp6_start (self=0x20b80b0, connection=0x205c280, dhcp_opt=2, reason=0x7fff46108d4c) at nm-device.c:1790