Comment 35 for bug 2042744

i FIX this with some thread.py edit:

vi /usr/lib/python3/dist-packages/eventlet/green/thread.py
(or your path to thread.py from exception traceback)
find this code:

def get_ident(gr=None):
    if gr is None:
        return id(greenlet.getcurrent())
    else:
        return id(gr)

and make try-except contruction for get id like this:

def get_ident(gr=None):
    try:
        if gr is None:
            return id(greenlet.getcurrent())
        else:
            return id(gr)
    except:
        return id(gr)

retry:
su -s /bin/bash keystone -c "keystone-manage db_sync"