[stack@odl ~]$ sudo systemctl status devstack@q-svc.service
● devstack@q-svc.service - Devstack devstack@q-svc.service
   Loaded: loaded (/etc/systemd/system/devstack@q-svc.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Tue 2017-10-10 08:33:44 UTC; 4s ago
  Process: 11691 ExecStart=/usr/bin/neutron-server --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/plugins/ml2/ml2_conf.ini (code=exited, status=1/FAILURE)
 Main PID: 11691 (code=exited, status=1/FAILURE)

Oct 10 08:33:44 odl.rdocloud neutron-server[11691]: INFO neutron.plugins.ml2.managers [-] Configured extension driver names: ['port_security']
Oct 10 08:33:44 odl.rdocloud neutron-server[11691]: INFO neutron.plugins.ml2.managers [-] Loaded extension driver names: ['port_security']
Oct 10 08:33:44 odl.rdocloud neutron-server[11691]: INFO neutron.plugins.ml2.managers [-] Registered extension drivers: ['port_security']
Oct 10 08:33:44 odl.rdocloud neutron-server[11691]: INFO neutron.plugins.ml2.managers [-] Configured mechanism driver names: ['opendaylight', 'logger']
Oct 10 08:33:44 odl.rdocloud neutron-server[11691]: CRITICAL neutron.plugins.ml2.managers [-] The 'opendaylight = networking_odl.ml2.mech_driver:OpenDaylightMechanismDriver' entrypoint could not ...nchronized''.
Oct 10 08:33:44 odl.rdocloud neutron-server[11691]: DEBUG oslo_concurrency.lockutils [-] Lock "manager" released by "neutron.manager._create_instance" :: held 0.353s {{(pid=11691) inner /usr/lib/...tils.py:285}}
Oct 10 08:33:44 odl.rdocloud neutron-server[11691]: 'module' object has no attribute 'synchronized'
Oct 10 08:33:44 odl.rdocloud systemd[1]: devstack@q-svc.service: main process exited, code=exited, status=1/FAILURE
Oct 10 08:33:44 odl.rdocloud systemd[1]: Unit devstack@q-svc.service entered failed state.
Oct 10 08:33:44 odl.rdocloud systemd[1]: devstack@q-svc.service failed.
Hint: Some lines were ellipsized, use -l to show in full.