It seems that the problem arises because one transaction attempts to delete a network, while another tries to update a port which belongs to that network, and both transactions try to update the table 'ports'.
http://paste.openstack.org/show/134710/
It seems that the problem arises because one transaction attempts to delete a network, while another tries to update a port which belongs to that network, and both transactions try to update the table 'ports'.
http:// paste.openstack .org/show/ 134710/