Comment 3 for bug 1600792

The bug has been reproduced at the step of OSTF tests running by Tempest CI job: http://cz7776.bud.mirantis.net:8080/jenkins/view/Tempest_9.%D0%A5/job/9.x_Tempest_LVM_no_ssl/89/consoleFull

The tracebacks for one of failed tests:
From ostf log - http://paste.openstack.org/show/570172/ :
ClientException: Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
<class 'oslo_db.exception.DBConnectionError'> (HTTP 500) (Request-ID: req-6accf408-72f3-457d-b3d7-cb43cc0b333e)

From nova-api log - http://paste.openstack.org/show/570171/ :
2016-09-08T22:55:12.277204+00:00 info: 2016-09-08 22:55:12.275 28769 INFO nova.api.openstack.wsgi [req-6accf408-72f3-457d-b3d7-cb43cc0b333e 8218301469224e5085ddb183a0cafbea bbb0de9a173d441f89c454a0545871d1 - - -] HTTP exception thrown: Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
<class 'oslo_db.exception.DBConnectionError'>

From cinder log - http://paste.openstack.org/show/570177/
2016-09-08T22:55:12.288621+00:00 err: 2016-09-08 22:55:12.259 26281 ERROR cinder.api.middleware.fault [req-61dab4c5-aaf5-4e7d-b0d6-009e71fdc686 8218301469224e5085ddb183a0cafbea bbb0de9a173d441f89c454a0545871
d1 - - -] Caught error: <class 'oslo_messaging.rpc.client.RemoteError'> Remote error: Remote error: DBConnectionError (_mysql_exceptions.OperationalError) (2013, "Lost connection to MySQL server at 'reading i
nitial communication packet', system error: 0") [SQL: u'SELECT 1']